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OHMEDA 7900 Ventilator Service Manual

1. N VENTILATOR PNEUMATIC SUBSYSTEM BELLOWS 100 0 E TEST LUNG i slg Of 2 PIN AN ASSEMBLY PATIENT 150 Q C N FEMALE DRIVE 2 PIN A PRESSURE 100 0 C C24 LIMIT iW T FEMALE SERVICE SWITCH o N T TEST N O FREE _ gt 15 F T OHMEDA 5 VDC 1 0 WATT PORT 1043 4 cmH 0 BREATHING PROPRIETARY N C VALVE m 2 CHECK Z FITTING 5 VDC DRIVE VALVE M M10 MALE INLET 5 1 0 AMP GAS VN HREA FLOW HECK 5 MICRON VALVE VALVE u GAS INLET E A REGULATOR 3 5 cmH 0 BIAS CLOSED UT WT 22 W Ii FRESH GAS FROM o Uebel gre Suspe 22 F T ANESTHESIA MACHINE o gt INTERFACE Ove 10 12 CPN eni5o MANIFOLD ELASTIOMERIC 3 8 ANTI Vi A 8 30 w B 30 M T DISCONNECT ITF EUN 30 F EU T 30 F B N GMS NSPIRATORY INSPIRATORY EXP IRATORY 02 wi STANDARD GAS GAS MECHANICAL PRESSURE RELIEF 200 mL FT alus 110 cmH O A vont mmm UI 22 M T 2 J 22 F T DIFFERENTIAL ORMEDA ey IAs OPEN PRESSURE TRANSDUCER 30 cmH 0 ATMOSPHERIC REMOVABLE w w BAG VENTILATOR SER W H VALVE l TRANSDUCER Y BLOCK P a A 30 M T 17 M B B 22 F T 30 F E 1 sb E AIRWAY 22 M T AN PRESSURE Bag POLARIZED CONNECTOR LUN a 22 F T WITH EPROM VALVE ABSORBER CONTAINS CALIBRATION DATA DRIVE GAS S 19 F E A S TITIO C X 70 LPM CONTINUOUS x pee IM t PATIENT INTERFACE LEN LPM PEAR PRESSURE 19 M T 19 F E 35 100 Pis tir E ach CONNECTION BOX 22 4 T 3F 1 aA EU y 1 FITTING SIZE AND
2. 4 31 Sensor s Gal DU nds dothidea tone e ne RSS Bde BE Reda 4 34 4 9 User SSMS occ hie a act teed OS See AN Be RNR ace ae m Pe a ho 4 35 Select Altitude nd cere tiles ce tees aw An ahi a ed Oe oR ASEM ARRA 4 35 Select DIVE GAS E 4 35 Adjust Brightness cause the teehee 4 36 Select Heliox Mode niu uno 1t vad eph Bela Aes eel ERU Edd 4 36 Exit Service Mode 15 ced ade Ba ea at aa shy d RONDA a UR 4 37 4 7 Troubleshooting Guides 2 reise d E ERI DURER eat RERDORREES 4 38 Troubleshooting Mechanical Electrical sellers 4 38 Troubleshooting by Alarm Messages 4 40 ii 1503 0151 000 3 27 97 Table of Contents 5 Maintenance 5 1 Maintenance Schedule 5 1 Maintenance zoe ux ui ISI elas 5 1 Yearly Maintenance Checks 5 1 Two Year Maintenance 5 1 5 2 Maintenance Procedures 5 2 Exhalation Valve Maintenance 5 2 Supply Gas Inlet Filter onis hear RH ee ha RR oe a AR wQ 5 2 Free Breathing Valve Maintenance 5 3 6 Repair Procdures 6 Genefal svc ebikidnse TL 6 1 Assemblies tools for removal and installation 6 1 6 2 Removing the 7900 ventilator from the Ohmeda Excel Modulus SE Gas Machi
3. 2 14 External Interface Connector 2 14 Sealed Lead Acid Battery ee 2 14 nacer 2 14 OI iue rod ake Mc e IDEM Shah ea NL M E o 2 14 Microcontroller Assembly 2 15 Functional Specifications 2 15 Program Memory 5 1 eros ei wee ERO ur ach xv bx E Ee 2 17 Plas iE PROM hinay side eei e edet MU tace RUE 2 17 System RAM 2 ep er EU ated PRI etr ice sm Pin td dx D na 2 17 Non Volatile Memory 2 17 Safety Relevant Computing 2 17 Watchdog Systems Rae b n vd 2 18 68040 Software Watchdog Timer 2 18 Operating Mode Watchdog 2 18 Error Response Sequence 2 18 DATAJCQUISIDOP 25 2 a a Sa Beha cd etes quat Ed edi a sea Bich acer 2 19 Analog to Digital Converter System 2 19 Multiplexer and Buffer Amplifier 2 20 A D GoniVerter Tis rosas ered ois nd uuu o CR E ios 2 20 Voltage Reference 2 21 Flow Valve Control s an anaana 2 21 Gas Inlet Valve Drive Circuit 2 22 Front Panel Display Interface 2 22 EL Display Controller 2 22 Video Display
4. SW_RET sw sw2 sw3 SCLK_PLUS SCLK_MINUS SDA1_INSP 37 DGND SDA2 EXP DGND E2 POWER a fe fa fe fs je ww fo o o N Ja SCLK_PLUS SCLK_MINUS SDA1_INSP SDA2 EXP E2 POWER Fam alo 74HC14 n fs m m o 2 w o QIOIOIOOO OIOIO OIOIOIO OIOIOIOIOIOIOIOIOIOJIQO O OO O O O O O GO O O O OO O O O O O O O O O O O O SSW4 GIVON_RR ssw4 48 LO_02_PRES XRESET 24 LO_02_PRES 74HC14 DGND 49 XIRQ6 25 50 CONTROL IACK6 51 NC CR5 SMBJ6 0A DGND 52 NC XDOUT7 53 NC XDOUT6 54 NC XDOUT5 55 N m XDOUTA 56 NC XDOUT3 57 XDOUT2 58 I NC XDOUT1 59 VDD VDD NC 74HC14 MC XDOUTO 60 SIGNAL CHAS GND 51 52 REM ON SH2 W REMON NC Figure 8 20 Power supply board schematic diagram page 4 of 5 7900 Ventilator 1503 0151 000 1 97 8 21 8 Schematics SH1 2 SH2 VDD 15V_SIB Q3 D45C11 SIB PWR SH4 vki VSW Q19 LM2940CT 15 vsw SIGNAL VSW 14 8 SIGNAL PGND 7 cuS 0 1UF 10 POWER_ON 13 50V VSW U27 MC14013B 12 C73 0 1UF 10v rex SIGNAL VSW 14 dud H4 SIGNAL PGND 7 SIGNAL VSW 14 8 SIGNAL PGND 7 U28 R78 R16 1 1 B 237K 3 01MEG vcc 2 luysri nvsr2 U27 178g 178w MC14013B MC14001B 3 seri SET2 2UF Box PJl OUTI OUT2 1 V 1 8W D ALARM GND TEST JUMPER SIGNAL VSW 14 SIGNAL PGND 7 U28 MC14001B SIGNAL VSW 14 VSW
5. VDD U25 32 EEPROM2KX8 9 QD8 C104 0 1UF 10 50V R127 33992 U27 EPM7032 1 R126 1 8W 33 2 1 031 GCLRN I 1 030 y GCLK I 1 029 178w 1 028 OE1N I 1 027 OE2N I 1 026 1 025 1 024 1 023 R139 1 022 10K I 021 EDI R Y 1 020 15 10K 1 8W 1 019 1 018 15 BS 1 8W 10K I 017 1 016 E s 10K 1 8W 1 015 1 R141 a 10K U51 1 014 1 8W EPM7032 1 013 B 1 031 EEPROM OE 1 012 178m GCLRN I 1 030 GCLK I 1 029 1 028 OElN I 1 027 EEPROM WR a VDD 3 15 23 35 CLOCKOUT_4 GND 10 22 30 42 MPXR CS ATOD SEL R216 OE2N I 1 026 33 2 1 025 1 024 1 1 8W 1 023 1 022 1 021 1 020 1 019 1 018 1 017 1 016 1 015 1 014 1 013 1 012 VDD 3 15 23 35 GND 10 22 30 42 Microcontroller board schematic diagram page 2 of 10 7900 Ventilator 1503 0151 000 1 97 QD 8 15 ATOD CLK TP ATOD CLK ATOD CS ATOD RD ATOD HBEN LDAC DAC WR DAC ADDR MUX A2 MUX Al MUX AO MUX2 SEL MUX1 SEL IRQ5 ATOD_BUSY DAC_CS VIDEO CLK VIDEO MEMCS VIDEO VIDEO VIDEO WD CS IOCS RD WR AUDIO AUDIO WE FP IN EN cs PWR IN EN EXT CS SH8 SH5 SH8 SH8 SH8 SH8 SH8 SH8 SH8 SH8 SH8 SH8 SH8 SH8 SH1 SH4 8 SH8 SH7 SH7 SH7 SH7 SH7 SH1 SH5 SH5 SH6 SH4 SH5 8 Schematics BD 0 15 U34 SRAM128KX8 U35 SRAM512KX8 U33 SRAM32KX8 A18 30 Es dg S oQ pran BR
6. 6 41 SIB Sensor Interface Board Assembly Removal 6 42 Replacement Calibration Instructions SIB 6 43 6 10 Patient Interface Harness Removal from Excel SE 6 43 6 11 Patient Interface Panel Harness Assembly Removal From Modulus SE 6 44 6 12 SIB Machine INterface Harness Removal 6 46 6 13 Test unit after repair asfollows r 6 46 7 Illustrated Parts List Z General aos sey ele a ac ase Ve IM Re RC Vou ca SP y hea 7 1 Special Instructions 5 oss oh cot hue mu ah EA te os d GIN ee eas 7 1 Stock Numbers for Replacement Parts 7 1 7 2 7900 SERVIGE Kio saus su ek 2 edges gn ern eos Sia alee iba e d 7 1 SIB HAMESSES acus ice aise oot Roe ete rg OE RA ed Rios ed ae 7 16 8 Schematics 9 Accessories Miscellaneous Parts 7900 Accessory and Bellows Mounting Kits llle 9 1 O amp M Mariuals 5 5 rd CER E HEN ERE RN YN a eb deep eda 9 2 iv 1503 0151 000 3 27 97 List of Illustrations List of Illustrations Section 2 Figure 2 1 Figure 2 2 Figure 2 3 Figure 2 4 Figure 2 5 Figure 2 6 Figure 2 7 Figure 2 8 Figure 2 9 Figure 2 10 Figure 2 11 Section 4 Figure 4 1 Displays Section 5 Figure 5 1 Figure 5 2 Figure 5 3 1503 0151 000 7900 Ventilator Excel SE and Modulus SE Anesthesia System Interface xa feat od nee based it aaa eases ailead
7. Battery under voltage cutoff function protects over discharging 30 minute battery backup operation under normal application Power Requirements Maximum input requirement 54 5 VA ac Maximum output capacity 26 7 W dc Heat generation The maximum heat generated from the power supply is 27 8 Watts ac to dc Conversion Input Voltage ranges from 85 to 132 and 190 Vac to 270 Vac 47 to 63 Hz enters the unit via power entry module with a medical grade line filter This filtered output is converted to dc voltage via a toroidal isolation transformer and bridge rectifier 1503 0151 000 3 27 97 2 Theory of Operation Power Entry Module Type Maximum leakage current Fuses Approvals Toroid Type Power capacity Voltage rating Leakage current Power efficiency Safety screen thickness Isolation hipot voltage Thermal fuse Dimension Weight Mounting method ac to dc rectifier Topology Rectifier type Peak current surge Power efficiency Output filter capacitor Output ripple voltage dc output voltage range Auto voltage adapting threshold 1503 0151 000 3 27 97 Line Filter with ac Connector amp 5 X 20 mm Fuse holder lt 5 uA 250V 50Hz 2A 250V Slow blowing 5X20 mm UL 1283 CSA C22 2 8 VDE 0565 amp EN 60320 High efficiency toroid 54 5 VA 85 270Vac 14 45 Vac 254A Max 85 90 115Vac 60Hz 60VA 0 005 Cu 4KV Thermik S01 110 C 115 mm diameter x 58 mm thickness 4 8 I
8. 8 18 Figure 8 18 Power supply board schematic diagram page 2 of 5 8 19 Figure 8 19 Power supply board schematic diagram page 3 of 5 8 20 Figure 8 20 Power supply board schematic diagram page 4 of 5 8 21 Figure 8 21 Power supply board schematic diagram page 5 of 5 8 22 These symbols reference supply common No Analog Ground Ny Digital Ground 7900 Ventilator 1503 0151 000 1 97 8 1 8 Schematics 1 8 BARB QUICK DISCONNECT
9. 8 15 Microcontroller board schematic diagram page 9 of 10 8 16 Microcontroller board schematic diagram page 10 of 10 8 17 Power supply board schematic diagram page 1 of 5 8 18 Power supply board schematic diagram page 2 0f 5 8 19 Power supply board schematic diagram page 3 of 5 8 20 Power supply board schematic diagram page 4 of 5 8 21 Power supply board schematic diagram page 5 of 5 8 22 1503 0151 000 3 27 97 vii Notes viii 1503 0151 000 3 27 97 1 Introduction Important The information contained in this service manual pertains only to those models of products which are marketed by Ohmeda as of the effective date of this manual or the latest revision thereof This service manual was prepared for exclusive use by Ohmeda service personnel in light of their training and experience as well as the availability to them of parts proper tools and test equipment Consequently Ohm eda provides this service manual to its customers purely as a business conve nience and for the customer s general information only without warranty of the results with respect to any application of such information Furthermore because of the wide variety of circumstances under which maintenance and repair activities can be performed and the unique nature of each individual s own experience ca pacity and qualifications the fact that customer has received such information
10. INSP_FLW 1 SH9 1 1 is 2 1 8W 1 8W 1 8W C12 x C10 6 1UF 053 0 027UF 0 15UF 10 AD822AR 10 10 50V 50V 50V R78 R79 R80 5 49 9K 49 9K 49 9K EXP FLW SH9 Z e 6 1 8W 1 8W 178W c8 a 0 1UF U59 0 027UF c6 10 AD822AR 10 0 15UF 10s 50v 10 50v SIB PWR SH4 V BATT cia I BATT sua R85 R86 R97 10K 10K 10K 1 1 1 1 8w 1 8W 1 8W TP7 TP5 CIRCUIT IS NOT INSTALLED SCHEMATIC 7900 MICROCONTROLLER 8 15 8 Schematics CR6 14 M1 roy IRFZ48 Ll R4 c75 15V 15V ogy FV DRV 1 0 1UF 0 1UF 2 VALVE R3 C50 10 10 ee 50v 50v N SUY sua m PRES PAT C49 NU PATIENT Sus U16 AD620AR sua m PAILRET R14 1 00K sug gELWLDAC NOTE R3 AND C49 50 ARE NOT INSTALLED 18 B 1 8w ggg Als 15V cj C60 10F UR I 10 16V U3 B AD712KR 10 0 R70 R13 C59 50 ov 200 0 01UF sua g P RES_INSP dus sui 6 ECHLVENT EN 2 26K 1 8W INSP FLW SHS 013 AD620AR cna glNSPLRET TP3 Ul AD712KR R64 R R60 C78 ctu 19V cqa 10 2K 3 2 10 2K 0 1UF 0 1UF 0 1 10 10 1 8w 50V 50V 5 UJ PRES EXP SH4 7 FLW SENS SH8 6 SH8 Ho EXP RET SHA 5 5y R 2 VRI VIN LP29521M yout INLET ERROR SENSE VALVE SH1 SHUTDOWN VREF Gic2G3G4 5VTAP FBI SHA SH8 SHA GIV SENS sug VDD 06 R158 15V R90 Q2 415V L AD820AR 200 MJD2955 Bo 1 8W R157 U48 16 5K HIGH 1 HIPRES SW NC TUO 13 12 HI DRIVE PRES O QOO SH1 6 EXC 18 1 PRESSURE 2 Hi 1 8W 1 8W 3 178w 612
11. Exhalation Manifold Mechanical Overpressure Bleed Off MOBO Exhaust 7 17 mm port 25 mm port to Scavenging Exhaust to System Ambient Figure 2 9 MOBO Mechanical Over pressure Bleed Off The Mechanical Over pressure Bleed Off Valve is a mechanical valve operating even if there is no electrical power The MOBO has two functions First it serves as a third level of redundancy to the ventilator s pressure limit control functions providing pressure relief at approximately 110 cmH20 Second the MOBO serves as a backup in the event of a complete blockage of the exhalation valve system relieving circuit pressure at approximately 30 cmH2O under such failure conditions 1503 0151 000 3 27 97 2 7 2 Theory of Operation 2 8 35 100 psi Supply ha lta egulator Supply Manifold Pressure Transducer 25 psi Bleed Exhaust gt gt to Ambient Mechanical Overpressure Bleed Off MOBO Exhaust I 17 mm port to Scavenging Exhaust to System Ambient 25 mm port Figure 2 10 Bleed Resistor Pressure Switch and Free Breathing Valve The Bleed Resistor is by design a controlled leak from 0 to 10 L min in re sponse to circuit pressures from 0 to 100 cmH20 The small amount of pneumatic flow exhausting through the bleed resistor allows for control of the exhalation valve s pilot pressure by modulation of the valve output The bleed resistor ex hausts only clean drive gas
12. D13 D14 VDD 3 15 23 35 D15 GND 10 22 30 42 SH2 WD CS D 0 15 SH2 8 TROT VDD 15 17 23 35 41 50 59 68 78 90 102 113 123 134 143 GND 13 21 36 42 51 55 60 69 79 91 103 114 124 126 135 144 A 0 23 SH2 3 5 7 Figure 8 7 Microcontroller board schematic diagram page 1 of 10 CTS 0 1UF 10 50V GTI 10UF 10 25V C155 0 1UF 10 50V C154 10UF 10 25V PWR_RESET C156 0 1UF 10 50V 8 8 7900 Ventilator 1503 0151 000 1 97 VDD U39 1 MAX488CSA R150 4 99K bi 1 E L us She VDD SCLK_PLUS SCLK_MINUS m Y PWR_ENABLE TXDA_340 RXDA_340 SDA1_IN SDA1_OUT TXDB_340 RXDB_340 SDA2_IN SDA2 OUT CLOCKOUT R165 10K m MG co de z CNTRL IACK6 IACK5 CHG DISABLE 340 IACK3 FLASH WR EN RD WR ui 02 amp gl a uuu slo a u ol VDD U37 1 2 74HC08 U37 4 ims j 74HC08 GIV_ON DAC_RESET VDD_FAIL MECH VENT SW HI DRIVE PRES MECH VENT EN vpp C117 0 1UF VDD SH4 SH4 SH5 SH4 SH4 SH5 SH5 SH4 SH4 SH5 SH5 SH2 SH4 SH2 SH4 SH3 SH3 SH3 SH2 4 6 SH3 SH2 SH3 SH3 SH3 SH4 SH9 SH4 8 SH10 SH6 SH6 9 SH4 6 9 74HC08 8 Schematics D 0 15 SH1 3 8 A 0 23 SH1 3 5 7 SH1 IACK5 SH1 5 RESET SH1 CLOCKOUT SH7 g VIDEO READY SH1 3 4 6 gp RD UR SH1 3 DS SI x CS3 sui g PSACKI SH1 g DSACKO Figure 8 8
13. SCLK MINUS SCLK PLUS SH1 2 SH1 2 NA NEAR AD694 PIN 5 7900 Ventilator 1503 0151 000 1 97 8 7 8 Schematics C40 0 1UF VDD C38 R186 10PF 499K 5 1 50V xi 1 8W c4i 32 768KHZ 10PF 53 VDD 50V RIN C148 C149 i 0 01UF 0 1UF SHS g PBUD CLOCK VDD sH3 gEFC2 vpp C143 CHE 10 VDD 50V R208 VDD 4 99K 1 1 8W GND RAD 3 6864MHZ 4 99K 4 1 1 8W sH5 gm DSCLK_BDM SHS m DS BDM sus g FREEZE BDM 7 SH5 gm DSO BDM 5 3 VDD T4FCT244 O R206 19 R205 200 4 99K i 1 8W SH5 DSI BDM SH5 BERR BDM MODCK XTAL EXTAL VCCSYN XFC FCO PGI FC2 FC3 TIN1 TGATE1 TOUT1 TIN2 TGATE2 TOUT2 SCLK X1 X2 DSCLK FREEZE DSO DSI DACK1 DONE1 DREQ1 DACK2 DONE2 DREQ2 TXRDYA RXRDYA TXDA RXDA CTSA RTSA TXDB RXDB CTSB RTSB CLKOUT VDD R180 C144 4 99K 0 1UF 108 1 8W vpp R179 4 99K 14 ijew RW 1 1 8W C142 0 1UF 10 VDD C158 0 1UF C150 0 1UF 10 C160 0 1UF 10 50V C140 CT59 10UF 10UF 10 VDD R167 VDD R160 VDD 4 99K 4 99K 1 1 1 8W 1 8W 25V D SH3 pg BERR SH3 g IRQ3 SH2 g ROS UAT SH4 gelROO EPM7032 1 031 uS GCLRN I 1 030 SH2 5 g RESET GCLK I 1 029 ETUR 1 028 SH2 g DSACKI DSACK1 OE1N I M SH2 geDSACKO PSACKO OE2N I 1 026 SH2 3 g Bs ps 1 025 bo po 1 024 D1 1 023 D2 1 022 D3 1 021 0 D4 1 020 VDD D5 1 019 D6 1 018 C146 D7 1 017 0 1UF 10 De 50v D9 D10 D11 D12
14. down Bootup Memory Failure Bootup memory CRC failure Reboot ventilator if problem con monitoring is not functioning or it tinues replace CPU board Minimum System Shut is unreliable down 1503 0151 000 5 26 0 4 41 4 Tests and Troubleshooting Condition Probable Cause Service Action Alarm Message Symptom Internal software error has occurred in a control setting change initiated by the user Monitoring still available Control setting input has failed Minimum system monitor ing CPU Failure ALU register test failure Monitoring is not functioning or it Minimum System Shut is unreliable down CPU Internal Error Internal bus error Monitoring is not functioning or unreliable Minimum System Shut down Display Voltage Out of Range Voltage out of range Monitoring is not functioning or unreliable Minimum System Shut down Flow Valve Failure Incorrect feedback Monitoring is still available Minimum System Monitor ing Gas Inlet Valve Circuit Fail ure Incorrect feedback Monitoring still available Minimum System Monitor ing Internal Ventilator Clock Too Fast Clock frequency greater than 110 of expected value Moni toring is not functioning or unreli able Minimum System Shutdown Internal Ventilator Clock Too Slow Clock frequency less than 90 of expected value Monitoring is not functioning or unreliable Minimum System Shut down Time out or incorrect code exe
15. 35 PLIMIT SW PEEP SW MENU SW STANDBY SW RD WR E 39 GND SH1 4 AC_LED_C SH4 j C AC LED A ysu VDD R217 150 R231 1 8W E fs fpe w fo j Ww Jw jo fo fw i Je Jo c 23 o e fw A o MECH ver LED 44 GND PUSHBUTTON SW lag OUTPUT B 1 lag QUTPUT A Iso d C46 C177 10UF 0 1UF 10 10 25V 50V X4 X1 UP DN M4 74HC14 ENON 74HC14 ENCODER DIRECTION MECH VENT EN SH1 4 9 TIKO ENCODER_CLK SH3 A WV LS7084 J RBIAS R227 C47 ves 100K 0 1UF 1 100PF 1 8W 100PF E is 105 1 8W 50V 50v 50v Figure 8 12 Microcontroller board schematic diagram page 6 of 10 7900 Ventilator 1503 0151 000 1 97 8 Schematics POWER INPUT SH1 6 8 SH1 3 SH2 SH2 SH2 SH2 SH2 SH2 SH5 15V oL SS C37 J3 1 VA P15 AUX GND 7 AUX GND 4 11 DGND 2 3 4 5 5 5V 6 C35 100UF 10v 100UF 2 10v D 0 15 A 0 23 VIDEO CLK VIDEO IOCS VIDEO WR VIDEO RD VIDEO MEMCS VIDEO READY RESET Figure 8 13 Microcontroller board schematic diagram page 7 of 10 C42 10UF 10 25V VDD VDD 2 91 92 C151 C43 C152 0 1UF 10UF 0 1UF 23 108 10 108 oa 50V 25V 50V d LP 88 o YD 90 XSCL S7 LCDENB 86 30 SED1351F 95 D8 u49 LDO Pea EZ rcs alig Ree I2 I l2 N S 78 BO 14 apo AB3 A4 19 apa ABS AB6 ABT ABS ABO AB10 AB11 AB12 AB13
16. Failure Minimum System Shut down Auxiliary gas outlet No Battery Low Battery Charge Low Battery Minimum Sys tem Monitoring System Shutdown Mini mum System Shutdown Battery Voltage out of range Battery current out of range 1503 0151 000 Condition Probable Cause Service Action 1 If EEPROM or CPU board was Reboot ventilator if problem con replaced reboot the ventilator tinues replace CPU board 2 Read write failure CRC failure 3 Default values will be used at power up CRC failure Monitoring is not functioning or it is unreliable Reboot ventilator if problem con tinues replace CPU board Walking pattern test failure Monitoring is not functioning or it tinues replace CPU board is unreliable Reboot ventilator if problem con Redundant storage test failure Reboot ventilator if problem con Monitoring is not functioning or it tinues replace CPU board is unreliable DCGO switch is in auxiliary posi Check switch and language set tion and language is not French tings Battery voltage less than 7 V 1 Check inline batt fuse while running on machine elect power 2 Measure batt volts 12 5 but lt 16V 3 Replace battery Voltage less than 12 5V while running on machine elect power 1 This message should disappear after charging for 12 hours 2 Measure batt volts 12 5 but lt 16V 3 If not the battery may be defec tive and need replacement Battery voltage les
17. Replace the O ring Lubricate with a thin film of KRYTOXTM 7 Back the seat threads counter clockwise until you feel the thread engage Hand screw the assembly into the manifold 8 Replace the deflection tube on the valve The tube has a rolled edge Ensure that the edge slips over the ridge of the valve seat 5 4 1503 0151 000 5 26 0 6 Repair Procedures 6 1 General WARNING Post Service Checkout is required after you complete this section You must perform section 3 Post Service Checkout after performing any maintenance service or repair Failure to do so may result in patient injury WARNING A When servicing the ventilator extreme care must be taken to avoid introduc ing foreign debris particularly metal chips generated by screw threads into the pneumatic flow passages of the ventilator Failure to do so may result in damage to the flow valve and possible injury to the patient Some of the illustrations in this section have callouts listed with the figures Others have numbers on the illustrations that correspond as references to procedure numbers Assemblies tools for removal and installation Description subassembly Top Cover Gnd wires top cover power module chassis Isolation transformer Encoder removal Front Panel Display board Microcontroller board Power Supply board PCB removal Power module Pressure Sensing Switch Drive gas check valve assy GIV cap removal Inlet valve body Sol
18. Service 7900 Vent 1503 8019 000 includes Serial communications cable 1503 3126 000 Ohmeda Software Upgrade Tool installation diskette 1503 7007 000 Instructions At least one field upgrade software kit For example Kit Software Rev 2 2 Field Upgrade 7900 Vent Part 1503 8021 000 Virus scanning software To Install the Ohmeda Software Upgrade Tool 1 Turn on computer and enter Windows m Quit all Windows applications excepting Program Manager be sure to quit all applications including background items such as the Microsoft Office icons Insert the Ohmeda Software Upgrade Tool installation diskette in drive A From the File menu of the Program Manager or File Manager choose Run Type a setup Follow the Setup instructions on the screen pU CO Guo o Run the virus scanning software to confirm no known viruses exist on the com puter Note In order to use the Ohmeda Software Upgrade Tool to perform an up grade first install at least one version of field upgrade software on the PC If you do not install at least one version of field upgrade software the Ohmeda Software Upgrade Tool will indicate that files are missing or corrupt during the upgrade procedure 1503 0151 000 5 26 0 6 17 6 Repair Procedures To install 7900 software field upgrade The software in the Cable Software Upgrade kit must be installed before follow ing these instructions 1 Qh xo Turn on the computer and enter Windows I
19. ao nj 50V 1 m i N ttam sc Te Faeroe m o oe 21 BD15 20 18 15 mBD10 SICHER n ix 13 Bp8 VDD SRAM32KX8 U45 C131 SRAM128KX8 Qg LUF FLASH512KX8 50V p D7 18 Neo Eu or G 7AFCT245 U42 EPM7032 1 031 SH1 5 RESET 1 ccLRN I 1 030 SH1 AS GCLK I 1 029 1 028 SH1 FLASH WR EN OE1N I 1 027 OE2N I 1 026 1 025 1 024 1 023 1 022 1 021 1 020 BERR A 0 23 1 019 T SHI SHi 42 551 1 018 ENCODER CLK SH6 SH1 2 4 6 RD WR 1 017 ROS SH1 SH1 S1Z0 1 016 a SHI SH1 C92 1 015 we NOTE SH1 CS1 1 014 s eo E i Only one of three possible 1 013 SRAM pairs is installed SH1 2 D 1 012 U33 amp U44 U34 amp U45 or U35 amp U46 VDD 3 15 23 35 GND 10 22 30 42 Figure 8 9 Microcontroller board schematic diagram page 3 of 10 8 10 7900 Ventilator 1503 0151 000 1 97 8 Schematics 1 PRES_PAT SHO 2 PAT RET SHO 3 PRES INSP SHO 4 INSP RET SH9 5 PRES EXP SHO 6 EXP_RET SHO 7 Q2 SH9 8 O2 RET SHO 9 10 SIB_PWR SHS 11 V BATT SH8 12 I BATT SH8 13 po NOT USE 14 po NOT USE 15 LOw_02_Sw Rie VDD 16 EXI SW4 17 Q2 FLUSH SW ELT VDD 18 DCGO SW 19 BAG VENT SW 20 EXT SWl VDD eee 21 EXT SW2 22 EXT SW3 10 23 BATT FULL 20v 24 _ MAIN POWER ON N15 FAIL SH10 P15 FAIL SH10 aes SH1 3 5 7 8 PWR IN EN SH2 T4ECT541 1 8w 74HC14 RD WR SH1 3 6 TM
20. cuted Monitoring is not func tioning or unreliable Logical Watchdog Failure Minimum System Shut down 4 42 1503 0151 000 5 26 0 Reboot ventilator if problem con tinues replace CPU board Reboot ventilator if problem con tinues replace CPU board Reboot ventilator if problem con tinues replace CPU board 1 Reboot ventilator if problem continues measure EL display 14 5V 10 15V volts at J3 pin 18 to pin 11 2 If out of spec disconnect Dis play board Measure again If within spec replace Display board continue 3 If still out of spec disconnect CPU board Measure again If within spec continue 4 Replace CPU board Measure again If still out of spec discon nect PSB continue 5 Replace PSB 1 Reboot ventilator if problem persists continue 2 Disconnect the connector to flow valve at J7 Refer to service mode Test Flow Valve diagnostic in section 4 1 Reboot ventilator if problem persists continues 2 Disconnect the connector to GIV at J6 Refer to service mode Test GIV Section 4 Reboot ventilator if problem con tinues replace CPU board Reboot ventilator if problem con tinues replace CPU board Reboot ventilator if problem con tinues replace CPU board 4 Tests and Troubleshooting Alarm Message Symptom Memory EEPROM Fail ure Memory flash Failure Minimum System Shut down Memory RAM Failure Minimum System Shut down Memory video
21. from Ohmeda does not imply in anyway that Ohmeda deems said individual to be qualified to perform any such maintenance or repair service Moreover it should not be assumed that every acceptable test and safety procedure or method pre caution tool equipment or device is referred to within or that abnormal or unusual circumstances can not warrant or suggest different or additional procedures or re quirements This manual is subject to periodic review update and revision Customers are cau tioned to obtain and consult the latest revision before undertaking any service of the equipment Comments and suggestions on this manual are invited from our customers Send your comments and suggestions to the Manager of Technical Publications Ohmeda Ohmeda Drive Madison Wisconsin 53707 CAUTION Servicing of this product in accordance with this service manual should never be undertaken in the absence of proper tools test equipment and the most recent revision to this service manual which is clearly and thor oughly understood Technical Competence The procedures described in this service manual should be performed by trained and authorized personnel only Maintenance should be undertaken only by com petent individuals who have a general knowledge of and experience with devices of this nature No repairs should ever be undertaken or attempted by anyone not having such qualifications Ohmeda strongly recommends using only genuine replacement
22. lift the power module out of the chassis 1503 0151 000 5 26 0 6 Repair Procedures Prepare power module for removal NNSQSNNNNNSNNNNNNNNNN NN Threaded holes for mounting screws item 5 to mount the power cord bracket Power cord fuse block Power cord securing bracket Lock washers No 4 external Bracket mounting screws 4x8 mm button socket head aE a Figure 6 20 Power cord removal 1503 0151 000 5 26 0 6 25 6 Repair Procedures 6 26 Isolation transformer removal Transformer mounting bolt Nylon sleeve Transformer ground wire Alignment hole Transformer coil Rubber insulator Mounting plate Nylon sleeve Nyloc nut 0 00 O Ot EG I Figure 6 21 Isolation transformer removal When you lift out the power module the a c power connector block comes out with the unit 1 Disconnect the wire lug connectors from the transformer to the a c connector block 2 Use a 7 mm nut driver to disconnect the ground wire from transformer to power module chassis 3 Usea 10 mm nut driver or wrench to loosen the transformer mounting bolt Hold the transformer with one hand while removing the hex nut and bolt from the center of the transformer 5 Replace the transformer in reverse order However ensure that the alignment pin on the transformer is inserted in the locating hole in the power module board prior to tightening the mounting nut and bolt 1503 0151 000 5 26 0 6 Repair Procedures Alarm speake
23. poppet 1503 5018 000 U cup upper 26 98 OD 20 63 ID 1503 3090 000 U cup lower 17 02 OD 5 33 ID 1503 3089 000 O ring 15 6 ID 20 4 OD Vito1503 3108 000 cludes mounting screws 1503 3105 000 2 Figure 7 18 Gas inlet valve 1503 0151 000 3 27 97 7 11 7 Illustrated Parts List 7 12 1 2 3 4 5 6 7 8 9 Screw M4 9211 0640 083 2 Alignment hole cover 1503 3122 000 O ring 1503 3056 000 Seal pressure valve t Diaphragm MOBOT Weight no pilot 1503 5015 000 Weight pilot 1503 5014 000 Installation alignment tool 1503 3124 000T Housing MOBV 1503 5016 000 mounting screw not shown 1503 3105 000 2 Installation alignment tool must be used when replacing seal Included in elastomers service kit 1503 8017 000 When replacing diaphram pilot weight must also be replaced Figure 7 19 MOBO Mechanical Over pressure Bleed Off valve 1503 0151 000 3 27 97 7 illustrated Parts List Screw M3 x 6 9211 0430 063 2 Pressure switch 1503 3023 000 Ground harness 1500 7049 000 Screw M4 not shown 0140 6226 118 Washer M4 not shown 9213 0540 003 3 Keps nut M4 not shown 0144 3717 314 Fitting with o ring 1503 3007 000 2 Tubing not shown 0994 6370 010 90 mm long 2 pieces Coupling not shown 1503 3026 000 Figure 7 20 Manifold components continued Screw M4 x 8 button head 0140 6226 118 Latch assembly service kit 1503 8014 000 Not shown guide springs i
24. 0 LUF lt 3 32K EE 1 hz 2 20 108 1 C96 R106 C51 C48 ss PGND 5 200v 50v 1 sw_L 0 iuF L 0 01UF Ht 330UF 5 8 s 105 10 A208 1 SYNC CSH E EDS 250V 160V 1 8W FB CSL x R37 C26 C30 c29 914 913 C88 og 3 CR13 10 E 2200UF 22UF E22ur E8 ZRESAU IRF540 3 3UF 7 Mo ESOB 55 R100 20 20 AR 20 rid p em 100V Zw 229 35v 35v 35v CHASSIS C d R105 H 1 8W GND C49 20 200 C31 35V P RLON Z2UF MTG1 MTG2 0 01UF 1 A LO 590 y 1 8W E 22 68 9 de crao K seoor sen ic eon SMCJ33A 20 N 27K 62V 5 i Z C PGND2 U24 CR3 TLP191B R133 RSs MBR1545CT 1 1 8W Vth c52 tt 3 2UF 150 VAC aloe 205 Bg 160V CR4 5 2 h MBR1545CT ate Cad o5 bpm 3 3UF ae z CR6 CD 20 c53 m R42 R15 a MBRS1100T3 35v 0 01UF 47 5K CR17 1 10 1 5240 50v 1 8W i0v ND NB SH2 5 VDD e BAIT P H SH3 C S VIN C S C L SINK RED TB 20K U6 1 1 8W UC3906 sui m 12055 OCI CSO OCT SRC R48 8 7 80 8 19 10K BATT_CUR_SEN ous U2 1 CR19 1 8W SUS e a IEEE 20K N Pie Sion lUF M t 1 8W i 1 8w R47 50v Loi 20K SP7 C11 MAIN POWER NOTE INDICATES DEVICES THAT HAVE A HEAT SINK low L 1UF om Po MATHGEOWERSON er o 208 0s CHG DISABLE m R9 Z 20K NP 885138 NU Figure 8 17 Power supply board schematic diagram page 1 of 5 8 18 7900 Ventilator 1503 0151 000 1 97 8 Schematics VR3 MIC29152BT 1 1 1 8W U25 CR32 MBRS1100T3 15V THT INPUT OUTPUT Sl REF VR2 sENSELL4 LP29521N ERROR 5VTAP SHUTD
25. 000 connects between the ventilator and RS 232 device 1503 0151 000 3 27 97 8 Schematics Schematics are subject to change without notice Circuit boards are available only as complete assemblies Figure 8 1 System connection block diagram 8 2 Figure 8 2 SIB schematic diagram interface cable connections 8 3 Figure 8 3 Patient interface cable Machine side 8 4 Figure 8 4 SIB interface hose and cable routing 8 5 Figure 8 5 7900 SIB schematic diagram page 1of2 8 6 Figure 8 6 7900 SIB schematic diagram page 2o0f2 8 7 Figure 8 7 Microcontroller board schematic diagram page 1 of 10 8 8 Figure 8 8 Microcontroller board schematic diagram page 2 of 10 8 9 Figure 8 9 Microcontroller board schematic diagram page 3 of 10 8 10 Figure 8 10 Microcontroller board schematic diagram page 4 of 10 8 11 Figure 8 11 Microcontroller board schematic diagram page 5 of 10 8 12 Figure 8 12 Microcontroller board schematic diagram page 6 of 10 8 13 Figure 8 13 Microcontroller board schematic diagram page 7 of 10 8 14 Figure 8 14 Microcontroller board schematic diagram page 8 of 10 8 15 Figure 8 15 Microcontroller board schematic diagram page 9 of 10 8 16 Figure 8 16 Microcontroller board schematic diagram page 10 of 10 8 17 Figure 8 17 Power supply board schematic diagram page 1 of 5
26. 2 m ONT Figure AA 85 083 Patient Interface Harness Assembly shown mounted on the Modulus SE left side 1503 0151 000 5 26 0 6 45 6 Repair Procedures 6 12 SIB Machine Interface Harness Removal 1 Set the SE System Master Switch to OFF Unplug the system AC power cord from the AC source Remove the Tabletop from the SE See Excel Service Manual section 5 1 Modulus SE Service Manual section 5 3 Refer to Figure 6 35 Disconnect connector J3 from P3 on the SIB Assembly Remove the two faston connections and the ground wire from the Oxygen Flush microswitch If applicable remove the two faston connections and the ground wire from the DCGO microswitch Disconnect the harness from the System Master Switch 9 Carefully cut and remove the cable ties that secure the electrical harness to the pan 6 13 Test unit after repair as follows 6 46 Connect the gas supply hose Connect the cable from the ventilator to the SIB board and the RS232 serial port connection if applicable Plug the ventilator power cord into the gas machine electrical box The unit should now operate external of the gas machine using the gas ma chine ON STANDBY switch for ventilator power Perform Post Service Checkout Section 3 1503 0151 000 5 26 0 7 illustrated Parts List 7 1 General The following illustrations are shown in a disassembled form for easier illustration of parts as they are disassembled The 7900 Venti
27. 3106 000 2 Keps nut M3 0144 3717 302 2 Figure 7 12 Alarm speaker Parts 1 through 9 are included with the transformer under part number 1503 301 7 000 1 Bolt 6 Rubber insulator 2 Nylon sleeve 7 Mounting plate 3 Ground wire 8 Nylon sleeve 4 Mounting location notch 9 Hex nut locking 5 Transformer coil Figure 7 13 Transformer assembly exploded view 7 8 1503 0151 000 3 27 97 7 illustrated Parts List 1 Foam retainer block 1503 3021 000 2 12 Volt battery with harness 1503 3045 000 3 Battery fuse 4 amp inline 1503 3074 000 not shown supplied with battery Figure 7 14 Battery 1 Screw M4 x 8 1503 3135 000 4 2 Bleed orifice 1503 5003 000 2a O ring not shown 0210 0547 300 Figure 7 15 Pneumatic manifold mounting 1503 0151 000 3 27 97 7 9 7 Mlustrated Parts List Drive gas check valve assembly 1503 3006 000 O ring 1503 3057 000 Flow control valve 1503 8013 000 Regulator 1503 3004 000 Peon Figure 7 16 Manifold components 1 O rings 1503 3056 000 6 2 O ring 0210 0538 300 1 Figure 7 17 Pneumatic manifold O rings 7 10 1503 0151 000 3 27 97 7 illustrated Parts List Or gre OU x 8 In Solenoid mounting screws included with solenoid Solenoid 1503 3088 000 Gas inlet valve body 1503 8012 000 Retaining ring 1500 3158 000 GIV cap 1503 5006 000 O ring 32 1 ID 35 3 OD 9221 3032 116 GIV shuttle with U cups Suttle
28. A14 AB14 AB15 ti N oscl OSC2 MPUCLK IOCS IOWR IORD 5 MEMCS MEMWR R190 MEMRD 200 BHE co de READY RESET MPUSEL VDO QU VD10 MU VD14 8 14 EA E5 E6 E8 E7 E2 E3 VDD 7900 Ventilator 1503 0151 000 1 97 VIDO VID1 VID2 VID3 HS VS VCLK SH6 SH6 SH6 SH6 SH6 SH6 SH6 8 Schematics 5V c91 C101 0 1UF E tour 10 10 50V 25V 5 D 0 15 SH1 4 6 7 D8 24 20 21 015 22 Eu gt 15V VREE MAX530BCWG c90 0 1UF 108 DAC ADDR 8 R103 0 1 1 8W SH2 DAC_CS 11 18 N 4 LDAC 16 13 1 SH2 sui m DACCRESET 15 17 2 C82 R102 0 1UF S 20K 108 0 1 AD822AR SON oe 1786 12 is fia N WY NV NV t TPQ VDD L2 5V 820H 1I 15V 15V 10 pes 30 99 100 C c C 100UF 0 1UF t jour 0 TP13 20 10 10 c35 ae 10V 50V 25v D E C80 E 108 10 50V 50V QD 8 15 T R101 SH2 R29 3 200 200 6 QD8 3 M 2 178W 1 A 4 EH 1 8W TP4 TP12 c U14 Rr o 6 do1ue AD820AR 10 50V D5 SSTRB D6 SCLKOUT VREF QD15 18 45V D7 DOUT NA U18 ATOD_RD 5 R238 SH2 oe RD waxioiBCuG 11 0K SH2 cs D SH2 ATOD HBEN HBEN hos SH2 4 ATOD BUSY BUSY D m 1 8W TP8 PO SH2 p gt 7O2 CLK CLK SCLK R107 3 BAR 100K CW lt _ R28 c88 c89 VDD REFADILS 5K 0 1UF 4 7UF P i s R237 c184 BIP v 2 108 108 a 14K 0 001UF baw s V v s 10 R119 DGND AGND VSS 1 8W 50V 200 U M iw 0 01UF 15K 1 8W 0 0 15 50V 1 8W NM SH2 SH2 SH2 SH2 SH2
29. GMS or MAS bag port Adjust the APL to read 10 cmH5O on the gauge The flow may jump briefly but should stabilize to read between 4 5 and 5 Lom Very gently push the tubes coming from the flow sensors slightly in all directions Observe to see if the flow measurements jump Caution A If either sensor reads more than 2 Lpm STOP This indicates a possible leak in the flow sensor pneumatic circuit Skip steps 3 and 4 go directly to step 5 If the pressure is increased further the SIB may be damaged 3 4 Adjust the APL to read 20 cmH5O on the gauge The flows may jump briefly but should stabilize to read between 5 and 5 Lpm Adjust the APL to read 40 cmH5O on the gauge The flows may jump briefly but should stabilize to read between 5 and 5 Lpm If the flow measurements on the ADC page stay near zero the flow sensors are good If either sensor indicates a flow where there is none there may be a leak To troubleshoot reduce the circuit pres sure back to zero Reverse the flow sensor connections at the SIB interface panel and repeat the above tests If the problem follows the sensor discard the sensor It has a leak If the problem stays with the same side of the circuit it is likely the leak is in the tubing under the SE table top not with the sensor 1503 0151 000 5 26 0 4 29 4 Tests and Troubleshooting 4 30 Calibrate Flow Valve The software prompts the user to perform the procedural steps to calib
30. Memory 2 22 Membrane Switch Inputs 2 22 LED Driver QUIDUIS set Gan eed ee ike Bune a wines eR E RES 2 22 Rotary Encoder nput 2 22 Mechanical Ventilation Switch 2 23 PICO AI cr sacas S hee M cosi i end M P Eu Q 2 23 Manifold Pressures bee we ate RG EAM Gite eG as bes oats 2 23 Front Panel Assembly Eo eem sue RE 2 23 Sensor Interface Board SIB 2 24 1503 0151 000 3 27 97 Table of Contents Inspiratory and Expiratory Flow Measurement 2 24 Patient Airway Pressure Measurement 2 24 O2 Concentration Measurement 2 25 Switch Connections 2 25 3 Post Service Checkout Test the Ventilator 0 00 eee 3 1 Test the Anesthesia System eee 3 1 Test all Options and Accessories a 3 1 4 Tests and Troubleshooting JA OWGIVIOW MP m 4 1 Testing Requirements NERA eee bowed 4 1 4 2 Service Mode Menu 4 3 4 3 DIAQMOStG LOSIS e cng ero oe Re Seas wina w Bede Nd ee Se eee pe Rea 4 4 Bots AG 22 W etes toss MAC rus nest cte muta Eg 4 4 Test External RAM usse 4 5 Test Display RAM S son n u dot
31. PRESSURE 20t0 120 cmH20 0209 02D1 18 235 25 235 cmH20 Zero Offset Reading nominal 621 LSB INSPIRATORY FLOW Zero Offset Reading nominal 2050 LSB EXPIRATORY FLOW Zero Offset Reading nominal 2050 LSB FLOW CURRENT SENSE 0 to 1 Amp FLOW DAC FEEDBACK 0 4 095 INLET VALVE CURRENT 0 to 200 MA 0943 0F2C 0 235 milliamps Off State Reading 0 to 259 LSB SENSE 7o CZ CONCENTRATION T2250 VOLTAGE REFERENCE 1220719 12787 WBEDWDS 1201235 Vols ESVTEST FIAT EL SUPP TEST ISV LOCALTOVATEST 15V SIB TEST 071A 089F 13 351 16 207 BATTERY VOLTAGE TEST 0 to 16 Volts 0000 0FFF 0 16 446 Volts V No Battery 12 5V On AC Low Battery 11 35V On BATT Low Battery 10 9V ON BATT Low Batt Shutdown lt 16V Batt Out Of Range BATTERY CURRENT TEST 0 to 4 Amps 0000 0FFF 0 4 095 Amps 300mA On Battery 4Amps Out Of Range 0 to LSB 0000 0006 0 0 006 ANALOG GROUND 1503 0151 000 5 26 0 4 15 4 Tests and Troubleshooting 4 16 Display I O signals The software will display all of the I O signals Discrete 1 0 Signals DPL Switch Status Off Main Power Status Main Power On 02 Flush Status DCGO Switch Status Ventilation 02 Supply Pressure Status Pressure 4 15V Fail Status Pass 15V Fail Status Pass Go To Main Menu Remarks This display is a service tool for DPL switch status shows off unless drive pressure has exceeded limit switch is N O QO flush switch status shows on or off when push
32. TYPE ARE SHOWN USING THIS 15 PIN FEMALE CONNECTOR LANK per SURE A CODE X X X WHERE L BAG CAP RELIEF IAS HOSE DIAMETER MILLIMETERS TO EVACUATION SYSTEM gt MALE n MET is BAR Hg E La can SUPPLY OHMEDA WASTE GAS SCAVENGING zm MM INsPLRATORY Oot c JUN SENSOR P F SPECIFIC ANESTHESIA MACHINE INTERFACE VALVE ASSEMBLY A Arne SSUR wi ww INTERFACE OPEN TO ATMOSPHERE J BOARD ZAN CONTROL BLEED TO ATMOSPHERE o o AN 0 20 LPM TOTAL TYPICAL FLOW 0 10 LPM DRIVE GAS 50 PIN FEMAL 9 PIN FEMALE Figure 8 1 System connection block diagram 0 10 LPM PATIENT AND FRESH GAS U S MARKET REQUIRES 30 mm FEMALE TO 19 mm MAL E ADAPTOR CONNECTOR A ELECTRICAL CABLE TO VENTILATOR MICROCONTROLLER BOARD NOT SHOWN TO MANIFOLD PRESSURE TRANSDUCER LOCATED ON MICROCONTROLLER BOARD NOT SHOWN Av VENTILATER POWER SUPPLY BOARD ZAN BIDIRECTIONAL COMMUNICATION TO EPROM AND INSPIRATORY O SIGNAL AN O FLUSH SWITCH DCGO SWITCH AND REMOTE ON OFF SWITCH NOT SHOWN 8 2 CONNECTOR 7900 Ventilator 1503 0151 000 1 97 8 Schematics SIB INTERFACE CONNECTOR SCHEMATIC Figure 8 2 SIB schematic diagram interface cable connections 02 SENSOR 2 CONNECTOR ORANGE B DRAIN WIRE Sat SENSOR CONNECTOR BLACK 2 3 4 CLEAR TUBING EXPIRATORY CLEAR TUBING TRANSDUCER HIGH EXPIRATORY INSPIRATORY TRANSDUCER ee SENSOR CONNECTOR 2 3 4 CLEAR TUBING 6 INSPIRATORY AR TUBIN TRANSDUCER PE
33. addition to the items specified in the O amp M 1 Run the flow sensor calibration test Run the Pressure Sensitivity Cal menu e Verify regulator pressure at 25 psig 0 2 psi at 15 L min of flow Set the valve to the 15 L min point using the Verify Flow Menu adjust as necessary Run the Flow Valve Cal menu Run the Cal Bleed Resistor menu Run Test Flow Valve menu Run Test Gas Inlet Valve menu Run Test Pressure Limit Switch menu cO 29or coe cuam Remove the Exhalation Manifold Mechanically cycle the MOBO Valve weights see section 6 figure 6 32 10 Inspect ventilator tubing bellows exhalation valve elastomers and supply gas filter Two Year Maintenance Replace Internal Battery Dispose of battery according to local codes Free Breathing Valve Free Breathing Valve Seat O ring During a maintenance visit user level maintenance must be performed in addition to this maintenance User level maintenance can be found in the 7900 Ventilator Operation and Maintenance manual 1503 0151 000 5 26 0 5 1 5 Maintenance 5 2 Maintenance Procedures To Replace the internal battery you must remove the control module from the an esthesia system and remove the cover see section 6 Repair Procedures for more information Exhalation Valve Maintenance See the Operation and Maintenance manual for maintenance and parts Supply Gas Inlet Filter 1 O ring install onto filter bowl prior to installation 2 Element ass
34. and should not be connected to a waste gas scaveng ing circuit The output is directed away from the electrical components to ensure that systems using oxygen drive gas meet the 10VA requirement for oxygen en richment The Pressure Switch is an electrical limit which automatically shuts off the GIV Gas Inlet Valve and flow valve if the pressure reaches a level of approximately 104 cmH5O When either or both of these valves is shut the pilot pressure to the exhalation valve falls rapidly as the flow discharges out the bleed resistor As the pilot pressure is relieved the exhalation valve opens allowing circuit pressure to be relieved The Free Breathing Valve also shown in figure 2 10 allows the patient to take a spontaneous breath The ventilator is programmed to supply a certain number of breaths per minute to the patient If in between one of these programmed cycles the patient requires a breath spontaneous the free breathing valve allows the pa tient to inhale ambient air spontaneously 1503 0151 000 3 27 97 2 Theory of Operation 2 3 Electrical The 7900 Ventilator consists of the following electronic electrical subassemblies or modules Microcontroller Printed Circuit Board Front Panel Assembly Power Supply and External I O Interface Board Sealed Lead Acid Battery Power Entry Module and Toroid Sensor interface board The specific function of each of these items is described in subsequent sections 2
35. any of the SIB interconnecting hoses 6 11 Patient Interface Panel Harness Assembly Removal From Modulus SE Note The Patient Interface Panel Harness is replaced as an assembly which in cludes the flow transducer connectors oxygen sensor connector interface har ness transducer tubing with color coded connectors and housing Set the SE System Master Switch to OFF Unplug the system AC power cord from the AC source Disconnect the Inspiratory and Expiratory Flow Transducers from the Interface Panel 4 Disconnect the Oxygen Sensor Harness from the Interface Panel 1503 0151 000 5 26 0 6 44 6 Repair Procedures 7 D 5 Remove the Tabletop from the Modulus SE See Modulus SE Service Manual section 5 3 6 Disconnect the four color coded tubing connectors from the SIB Assembly tubing 7 Carefully cut and remove the cable ties that secure the electrical harness to the pan Disconnect connector J1 from P1 on the SIB Assembly Open the Vanity panel on the rear of the Anesthesia Machine 10 While supporting the Interface Assembly remove the two M4 keps nuts item 5 Figure 6 37 using a 7 mm nutdriver 11 Carefully route the harness and tubing through the pan to remove the assembly AA 85083 Label patient interface 1001 3464 000 Harness SA SIB 1503 3081 000 Panel sensor interface Modulus SE 1004 3933 000 Spacer sensor interface panel 1004 3934 000 2 Nut keps M4 0144 3717 314
36. be caused either by the drive circuit or the flow valve malfunction Check the drive circuit Check the flow valve To check the drive circuit for proper voltage set the flow control to output 120 liters per minute Unplug the connector from the microcontroller board and measure the voltage between the pins it should be approximately 3 volts If the voltage is less than 3 volts measure the resistance between the leads at the unplugged flow valve connector A multimeter should read 3 ohms one percent If the resistance is 3 ohms the drive circuit is bad replace the microcontroller board and test the flow valve again If the flow valve test fails again replace the flow valve 1503 0151 000 5 26 0 4 11 4 Tests and Troubleshooting 4 12 Test Gas Inlet Valve GIV To test the gas inlet valve the software first closes the GIV It then reads the A D for the GIV Ifthe A D for the GIV does not read closed the test fails The software then opens the flow valve to the calibrated flow of the bleed resistor Then it waits for the flow to stabilize about 2 seconds Once the flow is stabilized the software checks to see if manifold pressure has dropped to less then 0 5 cmH20O If manifold pressure does not drop below 0 5 cmH O the test fails The software then closes the flow valve and opens the GIV It then reads the A D for the GIV and if the A D for the GIV does not read open the test fails Test GIV Directions for testing 1 Selec
37. conditioned pressure transducer outputs are Manifold pressure 20 to 120 1 5 cmH20 less than 30 cmHoO 20 to 120 5 cmH O greater than 30 cmH20 Front Panel Assembly The front panel assembly has a 480 by 240 pixels EL panel that displays measured and user adjustable parameters The user can change parameters with touch switches on the membrane or a rotary encoder with a switch LED s are incorpo rated in the membrane switch to indicate alarms mechanical ventilation On Stand by and Mains power 1503 0151 000 3 27 97 2 23 2 Theory of Operation 2 24 Sensor Interface Board SIB The Sensor Interface Board SIB is the interface for the ventilator control module and the anesthesia machine It is designed to be used in the Excel models 110 SE 210 SE s and Modulus SE The SIB is located in the anesthesia machine below the work surface table top In put air hoses and signal cables are routed from the side panel of the machine to the board A 50 conductor SCSI II cable routes power and signals to and from the Ventilator Respiratory gas flow to and from the patient is measured in the machine by creat ing a small differential pressure across a calibrated variable orifice The transduc ers for measuring the differential pressure are on the SIB The delivered patient airway gas pressure is also measured by a pressure transducer on the SIB In ad dition conditioning circuitry is provided for these transducers and for th
38. connections for removal Captive mounting screws 4 Ribbon cable microcontroller board to power supply board Ribbon cable microcontroller board to power supply board Ribbon cable microcontroller board to front panel board Guide slots for microcontroller board in chassis 3 1 2 3 4 5 Figure 6 13 Microcontroller board removal 1503 0151 000 5 26 0 6 15 6 Repair Procedures See previous illustration numbered callouts for the following steps 1 CAUTION Loosen the four 4 captive securing screws all the way three across the top of the board and one 1 half way down on the left side of the board They may require an off set flat blade screwdriver to loosen initially Ribbon cable between micro controller and power supply boards see Figure 6 10 for cable disconnection Ribbon cable between micro controller and power supply boards see Figure 6 10 for cable disconnection Ribbon cable between microcontroller board and front panel board see Figure 6 10 for cable disconnection Cable disconnection and loosening the four securing screws in step 1 frees the microcontroller board for removal Lift the board out of its guide slots tilt the board forward and carefully guide the mounted transducer and its pneumatic fitting through the opening in the pneu matic electronic barrier A When replacing the microcontroller board be certain that the bottom of the board is aligned and inserted into the three
39. contains ports for the bellows drive gas 25 mm the bellows return gas 17 mm and the AGSS Anesthesia Gas Scavenging System 30 mm Pilot control of the exhalation valve is accomplished through pneumatic connec tions internal to the 7900 ventilator main pneumatic manifold The valve is normal ly open requiring approximately 2 cmH O of pilot pressure to seal the breathing circuit 35 100 psi Supply inlet 25 psi Pressure R Supply egulator Gas Hose Bleed to Ambient Drive Gas Check Valve DGCV Exhaust to Scavenging System 17 mm port 25 mm port Figure 2 8 Drive Gas Check Valve In order to generate the required pilot pressure for sealing the exhalation valve dur ing inspiratory periods a DGCV Drive Gas Check Valve is used downstream of the exhalation valve pilot connection This valve is biased shut using an integral weight so as to generate approximately 3 5 cmH O of bias pressure prior to allow ing flow downstream to the breathing circuit During periods of operation when the ventilator is exhausting flow from the breathing circuit the DGCV allows the exha lation valve pilot pressure to be de coupled from the circuit pressure thus allowing the exhalation valve to open and flow to exhaust and the scavenging system 1503 0151 000 3 27 97 2 Theory of Operation 35 100 psi Supply inlet 25 psi Pressure R l Supply egulator Gas Hose Manifold Pressure Transducer r
40. failure replace EEPROMs 3 Replace CPU board 10027 Caused by high airway pressure No Service Action required above set Plimit 10029 Minimum system monitoring Reboot the system if problem continues caused by DPL switch tripping refer to Section 4 Test Press Limit Switch 1002A Minimum system monitoring Charge battery if error continues replace caused by a low battery battery 1002B Minimum system monitoring Reboot the system if problem continues caused by incorrect flow valve refer to Section 4 Test Flow Valve feedback 1002C Minimum system monitoring 1 Possible bad gas inlet valve caused by incorrect GIV feedback a Disconnect the connector to GIV at J6 Measure ohms at approx 25 ohms b If step a is unusually high or low replace GIV solenoid 2 Replace CPU board 1002E Minimum system monitoring 1 Reboot the system if problem continues caused by battery current A D out replace the PSB Power supply board of range Battery current gt 4 amperes 2 Replace the CPU board 3 Replace battery 1002F Minimum system monitoring 1 Reboot the system if problem continues caused by battery voltage A D out measure open circuit batt voltage of range Battery voltage gt 16V 2 Replace the PSB 3 Replace the CPU board 4 Replace battery 10030 Minimum system monitoring Reboot the system if problem continues caused by control setting change replace the CPU board fail 1503 0151 000 5 26 0 4 19 4 Tests and Trou
41. from the GIV remains at the filtered supply gas pressure 35 100 psi 25 psi Supply inlet Pressure Regulator Supply Outlet Gas Hose Figure 2 5 Non Relieving Pressure Regulator The pressure regulator is a Non relieving Pressure Regulator which regulates the high pressure filtered supply gas oxygen or medical air down to 172 kPa 25 psi 35 100 psi 2 Supply inlet an Pressure Supply Regulator Gas Hose 0 120 Lpm Figure 2 6 Flow Control Valve The Flow Control Valve is controlled by the microcontroller Signals are sent to the Flow Control valve which correspond to the generated flow requirements called for by ventilator settings and sensor signals The Flow Control Valve modulates the incoming 25 psi drive gases to a variable output from 0 to 120 liters per minute at pressures nominally ranging from minus 10 to plus 100 cmH5O 2 4 1503 0151 000 3 27 97 2 Theory of Operation 35 100 psi 25 psi Supply inlet Inlet Pressure Filter Regulator Supply Gas Hose Manifold Pressure Exhaust to Scavenging Valve AGSR 30 mm Port 17 mm Port 25 mm Port Bellows Return Bellows Drive Gas Gas Figure 2 7 Exhalation Manifold 1503 0151 000 3 27 97 2 5 2 Theory of Operation 2 6 The autoclavable Exhalation Valve Manifold contains an elastomeric diaphragm used in association with the flow valve to control the pressures within the breathing circuit The manifold
42. guide slots in the chassis En sure all cables are properly reconnected and mounting screws tightened Firmware Replacement Procedure CAUTION CAUTION 6 16 A The circuit board and EEPROM s are electrostatic sensitive Use and ap proved static control workstation and wrist grounding strap Place the Microcontroller Board on an approved static control workstation A Use care not to damage the tubing board on the manifold transducer Use a PLCC chip extraction tool to remove the two EEPROM s U30 and U40 Insert the two prongs on the extractor tool into the slotted corners of the EE PROM socket Install the new EEPROMs noting the label to ensure the correct chip is placed in the correct socket Align the EEPROM notch with the socket notch and press the chip down firmly 1503 0151 000 5 26 0 6 Repair Procedures Software Upload Procedure The 7900 Ventilator software can be field upgraded using the Ohmeda Software Upgrade Tool software 1503 801 9 000 and Field Upgrade 7900 Vent software The Ohmeda Software Upgrade Tool must first be installed on a IBM or compatible PC and at least one version of field upgrade software must be installed Ohmeda Software Upgrade Tool Parts and supplies required 7900 Ventilator with an Excel SE or Modulus SE To provide system on off and system power IBM or compatible PC including at least one serial port DB 9 and Microsoft Win dows version 3 1 Kit Cable Software Upgrade
43. i a ge 2 1 7900 Ventilator Operational Block Diagram 2 2 Supply gas inlet filtered 2 3 Gas Inlet Valve 2 3 Non Relieving Pressure Regulator 2 4 Flow Control Valve 2 4 Exhalation Manifold 2 5 Drive Gas Check Valve 2 6 MOBO Mechanical Over pressure Bleed Off 2 7 Bleed Resistor Pressure Switch and Free Breathing Valve 2 8 Electronic functional block diagram 2 9 Service mode main menu 4 3 TESEO Pi cos ei etta utem hr au rc I 4 4 Test External HAM iure be te ee a ie ceed ka ING 4 5 Test Display RAM rm o md Dona i to 4 5 Test Flash ROM 14 irse mre RE RM ERES ARIETE aq 4 6 T sEEEPRONM seu d s ayna qa aS Syin wees a ds 4 7 Test Front Panel nue e Kaede ge IR vate Doe et 4 8 Test Serial Ports is raodo Led wh x oe XR Me tae 4 10 Test Flow Valve uk ATLAS Exe a x a Eder d aes 4 11 Test Gas Inlet Valve sus seva Pt Ra ACERO glee EAR aca Ea 4 12 Test Pressure Limit Switch _ 4 13 Display A D Channels sic exe npe eet RP s 4 15 Discrete l O Signals 4 16 Battery Charge Status 4 17 System Error Log 3s
44. monitoring Reboot the system if problem continues caused by manifold pressure sen replace the CPU board sor failure 10042 The system clock has been repro Reboot the system if problem continues grammed CPU timer problem replace the CPU board 10045 Sustained airway pressure hold No Service Action Required ing for more than 10 seconds 10046 Minimum system shutdown low 1 Charge the battery battery less than 11 35V while system is running on battery 2 If the unit has been plugged in for 12 hours and the problem continues replace battery 4 20 1503 0151 000 5 26 0 4 Tests and Troubleshooting Error Code Description of error logged Service Action 10047 Minimum system shutdown SIB 1 Reboot the system if problem continues 15V test failed measure 15V 5 on J3 pin 1 to pin 2 If out of spec disconnect CPU and measure again 2 f within spec continue 3 Replace SIB 4 Replace PSB 5 Replace CPU board 10048 Minimum system shutdown 15V 1 Replace PSB Local 10 VA test failed 2 Replace CPU board 10049 Minimum system shutdown display 1 Reboot system if problem continues voltage test failed measure EL display 14 5V 10 15V volts at J3 pin 18 to pin 11 2 lf out of spec disconnect Display board Measure again If within spec replace Dis play board continue 3 If still out of spec disconnect CPU board Measure again If within spec con tinue 4 Replace CPU board Measure again If still out
45. of spec disconnect PSB continue 5 Replace PSB 1004A Minimum system shutdown A D Reboot the system if problem continues converter failure replace the CPU board 1004B Minimum system shutdown CPU Reboot the system if problem continues test failure replace the CPU board 1004C Minimum system shutdown flash Reboot the system if problem continues EPROM failure replace the CPU board 1004D Minimum system shutdown exter Reboot the system if problem continues nal RAM failure replace the CPU board 1004E Minimum system shutdown display Reboot the system if problem continues RAM failure replace the CPU board 1004F Minimum system shutdown soft Reboot the system if problem continues ware watchdog failure replace the CPU board 10050 Minimum system shutdown Reboot the system if problem continues sequential watchdog failure replace the CPU board 10051 Minimum system shutdown CPU Reboot the system if problem continues clock too fast replace the CPU board 10052 Minimum system shutdown CPU Reboot the system if problem continues clock too slow replace the CPU board 1503 0151 000 5 26 0 4 21 4 Tests and Troubleshooting Error Code Description of error logged Service Action 10058 Minimum system shutdown 1 Reboot the system if problem continues V_AUX test failed measure V_AUX J3 pin 5 and pin 6 If out of spec disconnect CPU board measure again If within spec continue Range is 4 988 to 6 09 vdc 2 Replac
46. panel on the gas machine and the SIB are easily made The cable also connects the O sensor to the SIB The SIB has another cable that goes out the back of the gas machine to the ventilator and connects to a cable connector on the 7900 ventilator chassis bot tom SIB Sensor Interface Board Assembly Removal 14 Set the SE System Master Switch to OFF Disconnect Oxygen pipeline hose and close Oxygen cylinders Depress the Oxygen Flush valve to relieve residual pressure Unplug the system AC power cord from the AC source Remove the Table top from the SE See Excel SE Service Manual section 5 1 Modulus SE Service Manual Section 5 3 A Do not disconnect the hoses while the SIB is under pressure This may damage the SIB components Ensure the flow transducers are not pres surized by removing the breathing circuit before disconnecting any of the SIB interconnecting hoses Disconnect the four color coded tubing connectors items 1 4 Figure 6 35 from the SIB Assembly tubing Disconnect connector J1 from P1 on the SIB Assembly item 10 Figure 6 35 Disconnect connector J2 from P2 on the SIB Assembly item 11 Figure 6 35 Disconnect connector J3 from P3 on the SIB Assembly item 6 Figure 6 35 Disconnect the O2 tubing from the SIB Assembly item 7 Figure 6 35 If applicable remove all gas cylinders Open the Vanity panel on the rear of the Anesthesia Machine If applicable remove any monitor from the shelf or sli
47. parts made or sold by Ohmeda for all repair parts replacements Special Notice Some information in this manual can possibly point the reader to electronic troubleshooting and component repair replacement level of service This information when supplied is only supplied to add clarity to service or trouble shooting statements Ohmeda Service 1503 0151 000 5 26 0 1 1 1 Introduction Personnel are mandated by Company Policy to service electronic equipment to a board replacement level only Read completely through each step in every procedure before start ing the procedure any exceptions can result in a failure to properly and safely complete the attempted procedure Unless otherwise specified values in this manual are nominal Sections in this manual begin on odd numbered or right hand pag es If there is no text on the preceding backup even numbered page it is labeled NOTES for your use if you wish Figures that require more than one page have the title and main text on the left even numbered page Additional figure information is on the facing odd numbered page Some terms used in this manual Note A Note provides additional information to clarify a statement in text Important WARNING CAUTION An Important statement is similar to a note but provides a comment of greater emphasis A A Warning statement with this symbol warns the reader of the possibility of injury to the patient or operator
48. switch engages and manifold pressure is not greater than 80 cmH2O or bootup calibration of manifold failed Manifold pressure airway pres Ventilate in volume mode only sure without PEEP Ventilator needs service Time out or state failure Moni Reboot ventilator if problem con toring is not functioning or unreli tinues replace CPU board able 1 Reboot ventilator if problem continues measure 5 8 V at J3 pin 5 and pin 6 If out of spec dis connect CPU Measure again If within spec continue 5 8 V out of range Range is 4 988 Vdc to 6 09 Vdc 2 Replace the CPU board 3 Replace PSB Reboot ventilator if problem con tinues replace CPU board 1 225 V out of range Post Service Checkout is required after you complete this section You must perform section 3 Post Service Checkout after performing any maintenance service or repair Failure to do so may result in patient injury 4 44 1503 0151 000 5 26 0 5 Maintenance 5 1 Maintenance Schedule WARNING A Do not perform testing or maintenance on this instrument while it is being used to ventilate a patient possible injury may result WARNING A Items may be contaminated due to infectious patients Wear sterile rubber gloves Contamination can spread to yourself and others Maintenance Perform User Maintenance from O amp M Manual Perform Test and Maintenance procedures from this Service Manual Yearly Maintenance Checks In
49. 0 p 74HC14 nee SWITCH o o lur HC eur MANIFOLD sug 50v C134 210PCBM 10 50v Figure 8 15 Microcontroller board schematic diagram page 9 of 10 8 16 7900 Ventilator 1503 0151 000 1 97 8 Schematics 15V 15V G3 15V_L 0 1UF PRES_PWR SH8 5 5V 5R5 TST SH8 U9 AD822AR VEL TST SH8 Figure 8 16 Microcontroller board schematic diagram page 10 of 10 5V 13 VDD_FAIL SH1 U2 AD822AR TLC354CD UA TLC354CD TLC354CD UA TLC354CD 1R225 REF SH8 C63 tL us 0 1UF LM4041AIM 1 2 U7 1 225V T E AD822AR P15 FAIL sia N15 FAIL sna N C67 g 15V 7900 Ventilator 1503 0151 000 1 97 8 17 8 Schematics AC_LED_A SH4 C90 C112 0 1UF 3 3UF Br VBOOT CTS b 14v VIN DL4004 Rise 10 20 75K VIN 30 60V 80V 550 e NN 1 A HI C41 C38 1 8W C92 R104 Q11 HEN C54 TO DINE TRANSSORMER 3 3UF TOK MS MTW45N10E 20 20 2 UE xs ULVECO AA24249 n 2 T 0v T 0v 56 R 03 160v dees SH1 13 35V 1 8W m 1 8W J4 E7 C93 H 1 3730F S SEC1 e U15 a Ll R34 2 C50 ds 10 ii MAX797 g7 n 3 L 0 01uF CR16 C46 06 B T NAVV e SEC2 105 W 55200 e 5600UF V VL og 100UH d Y CR41 20s C89 p 14 1 250V CR14 SMCJ33A 205 0 1UF SKIP BST 1 5w GBU8D II e apea pul t6 e 10 cup Lx C35 c91 R101 Roy elsi ARE 2200PF
50. 19 00 Ve nti ato r Supplemental to the Datex Ohmeda Excel SE and Modulus SE Anesthesia Machine Service Manual Ventilator Software Revision 2 X 1503 0151 000 3 27 97 Ohmeda 7900 Anesthesia Ventilator Supplement to Excel SE and Modulus SE Anesthesia Machine Service Manual Ventilator Software Revision 2 X 1503 0151 000 3 27 97 1503 0151 000 3 27 97 Table of Contents 1 Introduction 1 1 What this manual includes 22 05 sue aa ere eae gh hex ee eR 1 2 Je2 OW BOIS usta vier dra Futter ca Ted EQUUM ER QUI i usupa te EU Sa f ae 1 3 1 3 Standard Service Procedures 1 4 Operation and Service Manuals 1 4 Ventilator Tests i debere km ERA E hae ee kde prede e qus 1 4 1 4 7900 Ventilator Configuration erre 9r EXE HERE EE 1 5 Software Versions ius oomen xe oben CW Susa de 1 5 2 Theory of Operation 2 1 General ps srd umasa sa saa e BURG ER D d ER paseo P Baia 2 1 7900 Ventilator Features 2 2 Safely Features 2s nime ERREUR GR ad QR dade ERE ERA RE ES 2 3 2 Me Na ea cdi rom o Mudo C RUE eA ed EIL E 2 3 2 3 Tec MC awia qa ly alpa E ae aS phun apus 2 9 Power Supply Assembly iure xc Rr eer xA RH RES REX 2 10 Power Supply 35 60 heo te EO ache e ot d d een 2 10 Synchrononus step down regulator 2 13 External Interface cuero suce tus wd pute EO HI e RAS bees 2 14 Communication Interface RS232C
51. 1M low dropout regulator providing a regulated 5 Volts to the inlet valve when enabled by the microprocessor The SHUTDOWN pin of the regulator provides on off control This regulator has an output current of 250mA It has an internal current limit of 530mA max This keeps the output under 10VA in a single fault condition and meets the 10VA requirements of IEC 601 2 13 Acurrent sensing circuit is included to allow the processor to monitor the inlet valve current via the A D converter system and detect fault conditions Front Panel Display Interface All signals to and from the Front Panel are protected from ESD through the use of transient suppression devices and appropriate filtering All of these signals are routed through a single connector from the microcontroller board to the front panel assembly EL Display Controller The S MOS SED1351F Flat Panel display controller drives 480 horizontal pixels by 240 vertical pixels of the front panel EL display Ferrite beads filter the signals from the display controller to the display Video Display Memory This memory consists of one high speed 32K x 8 CMOS static RAM directly con nected to the SED1351F display controller but mapped into 68340 memory space Membrane Switch Inputs These signals are electronically debounced and sampled by the 68340 processor LED Driver Outputs The ac on LED are turned on directly from the ac power applied and the mechan ical ventilation LED is controlled b
52. 3 U43 1 8w 15K SDA1 INSP 1 o 5 Ros SDA1_IN U43 M5 1 1 8W 74HC14 74HC14 2N7002 SDA1_OUT 3 Eos VDD 74HC14 R131 4 99K N 1s Ris U43 043 1 8W 15K SDA2 EXP 13 po 11 DoH SDA2_IN U43 M6 1 1 8W 74HC14 74HC14 2N7002 SDA2_OUT 9 Ko 74HC14 PWR_ENABLE ND EZ POWER M3 U48 2N7002 9 8 74HC14 Figure 8 11 Microcontroller board schematic diagram page 5 of 10 8 12 7900 Ventilator 1503 0151 000 1 97 SH1 SH1 SH1 SH1 SH1 5 SH1 SH1 SH4 SH1 SH1 SH4 8 Schematics vs SH7 HS SH7 VCLK SES VIDO SH7 VID1 VID2 VID3 SH7 SH7 SH7 VDD yop 179 VDD VDD VDD VDD 0 1UF MECH VENT SW SHI R221 R52 R53 R225 R49 10 2 26K 50V 2 26K 2 26K 2 26K 2 26K 1 1 1 1 8W R57 J5 FRONT PANEL INTERFACE 13 pos ALARM_SW 2 l VH VDD PLIMIT SW PEEP SW gt epo LI 1 1 8W 74HC14 m io lt l I2 N Vs afo N vo Joo o z 9 74FCT541 C166 0 1UF I 74HC14 HS 10 ND 11 VCIK 12 GND 13 VIDO 14 GND 15 VIDI 16 GND 17 VID2 18 GND 19 VID3 ND 21 vH 22 VH 23 GND 24 GND 25 VL 26 VL ND 28 GND 29 GND C169 74HC14 0 1UF 10 10 10 10 10 50V STANDBY_SW D 0 15 74HC14 l da SH1 3 5 7 8 74 0 1UF 10 50V FP_IN_EN SH2 74HC14 M HI DRIVE PRES SH1 9 C171 0 1UF 10 50V 74HC14 C170 0 1UF 10 50V U57 11 10 Do R222 4 99K 1 74HC14 1 8W
53. 34 Figure 6 35 Figure 6 36 vi Excel 210 with mid shelf and integrated 7900 ventilator 6 2 Removing the ventilator from an Excel Modulus SE Anesthesia Gas Machine eee u Susu asa te LA kausayqa asr ge 6 3 Excel 210 without mid shelf and non integrated 7900 ventilator 6 4 Non integrated 7900 ventilator and mounting tray insertion 6 5 Ventilator mounting tray 6 6 Setting up the service shelf 6 7 Put the ventilator on the service shelf _ 6 8 Removing the top cover screws and cover 6 9 Sub assembly locations reference _ 6 10 Disconnecting cables for circuit board removal 6 11 Removing the power supply board 6 13 Microcontroller board connector and cable identification around manifold pressure transducer 6 14 Microcontroller board removal 6 15 Front panel removal 6 19 Disconnect cable 6 19 Remove display board 6 20 Replacing the encoder 6 21 Battery removal Lana RAN S 6 22 Power Module removal 6 24 Power cord removal llle 6 25 Isolation transformer rem
54. 503 0151 000 3 27 97 7 1 7 Mlustrated Parts List 1 Screw M4 0140 6226 111 4 2 Label set 1503 3027 000 includes fuse label on bottom chassis Figure 7 1 Top cover Washer 9213 0540 003 Ground wire 1500 7037 000 Hex nut 0144 3717 314 Top cover 1503 3031 000 BOB Figure 7 2 Top cover ground wire connections 7 2 1503 0151 000 3 27 97 7 illustrated Parts List Figure 7 3 Isolation barrier gasket 1503 3018 000 Signal harness 1503 3054 000 DC power harness 1503 3053 000 Keyboard microboard harness 1503 3052 000 Screw M4 x 8 1503 3135 000 Main chassis 1503 3040 000 oO PONS Figure 7 4 Front panel assembly mounting and harnesses 1503 0151 000 3 27 97 7 3 7 Mlustrated Parts List Key board front panel 1503 3010 000 Bezel 1503 5001 000 Keps nuts M4 0144 3717 314 6 1 Figure 7 5 Front panel key board and bezel EL display kit 1503 8010 000 Keps nut M3 0144 3717 302 4 1 2 Figure 7 6 EL display panel mounting 7 4 1503 0151 000 3 27 97 7 illustrated Parts List xy I NES y C a fom P 1 Harness display keyboard 1503 3051 000 2 Ground harness 1500 7048 000 2a Keps nut M4 not shown 0144 3717 314 2 2b Washer M4 not shown 9213 0540 003 2 3 Keyboard microboard harness not shown 1503 3052 000 Figure 7 7 Front panel display assembly harnesses 1 Rotary encoder 1503 3012 000 includes all parts
55. 6 COFCO Plaza 8 Jianguomennei Avenue Beijing 100005 PR China Tel 86 10 6526 9773 Fax 86 10 6526 0653 Datex Ohmeda Inc Ohmeda Drive PO Box 7550 Madison WI 53707 7550 USA Tel 1 608 221 1551 Fax 1 608 222 9147 www datex ohmeda com Datex Ohmeda Pte Ltd Room 1708 Yunlong Mansion No 122 Luoguo Street Chengdu 610017 PR China Tel 86 28 661 4424 Fax 86 28 676 2703 Datex Ohmeda Pte Ltd 403 Huan Shi Dong Road Room 1602 GIE Tower Guangzhou 510095 P R China Tel 86 20 8732 2521 Fax 86 20 8732 2518 Datex Ohmeda Pte Ltd Room 2509 Lippo Plaza No 222 Huaihai Road M Shanghai 200021 P R China Tel 8621 5382 5657 Fax 8621 5382 1691 Datex Ohmeda Pte Ltd Room 809 Truroll Plaza Wusheng Road Wuhan 430033 P R China Tel 86 27 8571 2536 Fax 86 27 8571 2655 India Datex Ohmeda India Pvt Ltd Block EP amp GP Sector V Plot XI 16 Salt Lake City Calcutta 700091 India Tel 91 33 3574002 Fax 91 33 3574001 Indonesia Datex Ohmeda Pte Ltd Wisma Danamon Aetna Life 19th Floor JIn Jend Sudirman Kav 45 46 Jakarta 12930 Indonesia Tel 62 21575 0864 Fax 62 21 575 0865 Japan Datex Ohmeda K K TRC Annex 9F 6 1 1 Heiwajima Ohta ku Tokyo 143 0006 Japan Tel 813 5763 6801 Fax 81 3 5763 6838 Datex Ohmeda K K Technical Center TRC A Bldg AE 4 8 6 1 1 Heiwajima Ohta ku Tokyo 143 0006 Japan Tel 813 5763 6850 Fax 81 3 5763 6852 Korea Datex Ohmeda Pte Ltd 10th Floor Sam
56. Acid Battery A sealed lead acid battery provides battery backup operation for the 7900 ventila tor Batteries meet the following requirements Capacity to operate unit for 30 minutes Good reliability history with Ohmeda Long float charge life q que ost Battery pack is internally fused in line replaceable The 7900 is not a portable unit Batteries for the 7900 Ventilator are used as back up power in case of a power failure Therefore the battery is in a float charge state most of the time Battery terminals and connecting wires are protected against short circuits Input Nominally 13 7 Vdc at 25 C during float charge Output 10 to 14 8 V dc during discharge 1503 0151 000 3 27 97 2 Theory of Operation Microcontroller Assembly The Microcontroller Assembly contains all of the major circuit functions necessary to control ventilator operation This assembly consists of the following individual circuits Motorola 68340 Processor Core The CPU core consists of the following internal functions Bus access control signals for all memory and peripheral devices Interrupt handling Clocks and timers for the system Background debug mode Two RS232C serial I O ports Baud rate generator for serial ports Hard power up and soft watchdog error reset generation Data bus buffers Memory and I O decoding Program Memory Safety Relevant Computing Watchdog System Data Acquisition Flow Valve Control Inlet Valve D
57. C21 R21 CONNECT SHELL TO CHAS_GND 24 Deg C 02 100 C 0 015UF 2 Q Output 1 90 to 4 00 V O SCLK_PLUS 10 EM 7 BW ADJ 20 9 0 315 to 0 525 V SCLK MINUS 50V 1 8W 12V 10V FORCE O u J1 c24 2 50 V MAX OUTPUT SDA1_INSP 1 0 10F 8 BOOST O 2V SENSE O SDA2 EXP Lo fool m 1 10 FEEDBACK IOUT MJD3055 O C14 R17 50 AD694BR Q 0 015UF 2 2 SIGNAL ALARM O 10 5 SH 50V 1 8W O O LO_O2_PRES 2 SH2 O2 SENSE 3 SIGNAL c6 O LO O2 PRES n 100K VOS1 VOS2 2VFS COM 4MA 4MAADJ S oy NEWO2_SENSE O VR2 TP16 412V siam ANN NEWO2 O MAX667CSA E SH2 R23 50 MTG3 88 7K C23 O 0 001UF R32 1 8W 108 V C29 EE RES tour SH g C2 SENSE SH1 1 8w T 10 c3 25V NM NET CONNECTED TO ANALOG GND SIGNAL CHAS GND 51 52 TRACEWIDTH 250 Y UE NA NEAR AD694 PIN 5 CONNECT SHELL TO CHAS GND 50 29 dT NET CONNECTED TO ANALOG 1 8W GND NEAR AD822 AND 88 7K Figure 8 5 7900 SIB schematic diagram page 1 of 2 8 6 7900 Ventilator 1503 0151 000 1 97 8 Schematics 12V C37 0 01UF 2 000 V 10 50V an NA 4 J2 6 1 2 XI O alo 3 C30 US R15 OCQUE AD820AR 15K 109 R34 1 88 30 1K 130 1 1 15V 1 8W y 1 8w NEWO2 Bui C31 is O2 SENSE ST l R13 8 87K gos 0 18 1 an NET CONNECTED TO ANALOG GND 1 8W NEAR U12 AD820 PINS 3 amp 4 R33 EXC 1 18K 1 CR2 Sv 1 8W 5 SMBJ6 0A 7 6 COM IN c25 R25 0 1UF 1 00K 3 U 7 10 0 1 AD822AR 50V 1 8W SCLK P
58. Figure 8 14 Microcontroller board schematic diagram page 8 of 10 FLW DAC ATOD REF TST 5V CR4 2800 R100 2 26K Co oe z CR3 2800 MUX2 SEL MUX1 SEL MUX AO MUX Al MUX A2 SH8 9 SH5 15V 671 0 1UF 10 50V U10 13 MAX358CWE 4 5 6 7 L4 220UH 12 Wy ELW SENS 20 0 05AMP L8 220UH UV ELW DAC 20 0 05AMP 14 3 L3 220UH N PY GIV SENS 20 0 05AMP L7 220UH y 92 coNc 15V 20 C78 0 05AMP 0 1UF ios c11 C13 R233 C REI R235 LIN B AiK 80 20 Bes eT 80 20 t 25V is 25V 1 4W 1 4W C22 C26 8232 E 367 908 8234 807 508 2 21K 25V 2 21K 250 1 4W 1 4W NOTE R232 235 ARE NOT INSTALLED 15V 672 0 1UF 10 50V U11 13 MAX358CWE 1R225_REF 2836 5R5_TST SH10 VEL TST SH10 PRES PWR L10 C14 C15 C28 NA 2 2UF 2 2UF 2 2UE 80 20 80 20 80 20 25V 15V C81 0 1UF 10 50V NOTE TEMPERATURE MEASUREMENT 7900 Ventilator 1503 0151 000 1 97 SH9 SH8 9 SH9 SH9 lov el eo Coo nj o a hj aR oo oe eue oo oe R94 R95 R96 8LAs 49 9K 49 9K 49 9K b PATIENTA SH9 15 2 1 8W 1 8W 178W c23 C25 0 027UF G UF U61 105 C24 yr 10 AD822AR 50V 4 ok 50v 50V R91 R92 R93 5 49 9K 49 9K 49 9K MANIFOLD 7 SH9 18 13 1 1 8W 178W 178W R236 ci7 c21 200 0 027UF 6 1UF vel 1 10 a i s AD822AR i ew 50v C1 or 50v 10 50v R236 I NOT INSTALLED NM s 15V 15V qq 0 TUF 0 1UF TP6 10 10 50V 50V 8 R81 R82 R83 3 49 9K 49 9K 49 9K
59. H Auf der H he 49 Gewerbehof 49 D 47059 Duisburg Germany Tel 49 2065 691 247 Fax 49 2065 691 255 Italy Datex Ohmeda S p A Via Cassanese 100 20090 Segrate Milan Italy Tel 39 2 21693431 Fax 39 2 26926226 Netherlands Datex Ohmeda B V Kantemarsweg 18 Post Box 22 3870 CA Hoevelaken Netherlands Tel 31 33 253 5404 Fax 31 33 253 7223 Spain Datex Ohmeda S L C Manuel Tovar 26 28034 Madrid Spain Tel 34 1 334 26 00 Fax 34 1 358 12 84 United Kingdom Datex Ohmeda Ltd Ohmeda House 71 Great North Road Hatfield Hertfordshire AL9 5EN England Tel 44 1707 263570 Fax 44 1707 260191 Latin America Caribbean Datex Ohmeda Latin America 10685 North Kendall Drive Miami FL 33176 USA Tel 1 305 273 9940 Fax 1 305 273 4382 Middle East Datex Ohmeda Middle East Operations P O Box 5527 Dubai United Arab Emirates Tel 97 14 822653 Fax 97 14 822659 All rights reserved
60. LUS 981 2 WW SCLK_MINUS SH1 2 SH1 2 m SDAl INSP SDA2 EXP SH1 2 N PLACE NEXT TO CONN P1 0 200 V Offset TPS FL2 2JK5103 05 PLACE NEXT TO CONN P1 c41 0 1UF 10 50v P1 8 CLOCK 15 INSP DATA R7 7 SWITCHED 45V 4 99K DIGITAL GND 1 8W TEMP COMP SENSOR A TPT 5 SENSOR B I OG G ANALOG GND SDAl INSP mw SH1 2 CLOCK INSP EXP DATA 3 SWITCHED 45V TRII DIGITAL GND SPASE E SH1 2 EXP c5 100PF 1 5 NY 50v C Ioopr MIGl 5 OS NEWO2_SENSE sai 50V CHAS GND 16 17 CONNECT SHELL TO CHAS GND Figure 8 6 O2 SENSE m N SH1 7900 SIB schematic diagram page 2 of 2 JOINED NEAR 50 PIN CONNECTOR 12V 14 c40 BW ADJ 0 1UF 10V FORCE BOOST 10 2V SENSE 2 050 V at 24 deg C 50V Zero Pres 1 481V Zero Pres i FEEDBACK US IOUT d U11 TP10 AD694BR I MJD3055 265100 OHMEDA 710 SIGNAL ALARM SH1 2 OUT SIGNAL VOS1 VOS2 2VFS COM 4MA 4MAADJ Rae es ls P 4 5 9 p 11 0K 6 01UF 50v 18 108 1 8W 50v N 0 mu EXP_RET SH1 NET CONNECTED TO ANALOG GND NEAR AD694 PIN 5 TP17 12V C38 0 1UF c39 10 0 1UF 50V 10 50V 15V 14 13 BW ADJ vs 10V FORCE 8 Boost H 2V SENSE 2 050 V at 24 deg C Zero Pres 1 481V Q4 Zero Pres 1 s U12 sene U10 7518 FEEDBACE AD694BR IOUT M3p3058 19 265100 OHMEDA SIGNAL ALARM Ho PRES INSP SH1 3 SIGNAL VOS1 VOS2 2VFS COM 4MA 4MAADJ C33 4 5 9 6 Toa C35 2 R35 0 01UF 50V 11 0K 10 15 50V 1 8W INSP NM INSP RET sui NET CONNECTED TO ANALOG GND
61. OWN FEEDBACK Gl G2 G3 G4 G5 G6 Q8 NRFP5SONOSL Osee oo lt o w n a e CR26 U16 MBRS1100T3 LM2940CT 15 I 1 3 v IN VOUT COM OUF 2 F WNERQ NNOO odo 2 3 0 5 ooo 2 0 0 5 J PJ2 Connect for Test ou Or D U20 200K AD822AR LM385M 2 5 VB VB SH1 5 2 C19 c12 ce2 Z200UF ioUF L 0 1urF 20 20 7 103 35V 85v 50v R81 2 21K t 1 4W 500 11 MAX796 lt br V VL e E 2 sgcrFB BsT Li 20 S REF pH HE 35V al exp ix t5 EE SHDN DL o LUF Ss PGND Q H S syuc csu 5 19 D SI 108 FB CSL 20 e R20 j 9 uo SRAU 1 260 B R2 10 1 5 178W 2W P R21 NPZ 22 1 C7 6 01UF 10 50v Q18 R17 BSS138 499K I NNV 1s C75 R140 178w lUF R8 NEZ 10 coe 20 50V 1 8W i SHS POWER_ON NP NU iiu U12 ue 10 34 11 57V POSU BSS138 CR20 5248 C16 C13 REM ON TV Y00UF I00UF SH4m 205 20 16V 16V REM ON NC Figure 8 18 Power supply board schematic diagram page 2 of 5 7900 Ventilator 1503 0151 000 1 97 Q10 D45C11 VA_P15 1 Ico w VDD ig _ van 17 varr 1g PGND3 PGND4 N 8 Schematics CR33 VDD C103 1l T2 cm TXDA 1 6 TXDB SH4 U22 Bune MAX251 SH4 SH4 EXDB AC 4 3 ripmn m10UT I50 TXDA NS 3 T2DIN
62. SIGNAL PGND 7 C86 uzg les GN in V 13 11 MC14001B N Figure 8 21 Power supply board schematic diagram page 5 of 5 8 22 Unused U19 Gates SIGNAL VSW 14 SIGNAL PGND 7 5 U28 MC14001B 7900 Ventilator 1503 0151 000 1 97 C17 1000PF 20 200V VSW LS1 BS2620PH 1 12V V 3 TRIG GND 2 R92 8 25MEG 1 1 8W C84 3 3UF 20 35V 9 Accessories Miscellaneous Parts 7900 Accessory and Bellows Mounting Kit Accy Common Parts Mounting plate assembly ABA Bellows assembly autoclaveable Diaphragm assembly Gasket manifold O rings Hoses GMS Vent interface 4 Flow transducer Adapter Oo sensor Oo sensor Label Kit Mtg For ABA to GMS Loctite Support SA bellows Screws 3 8 24 x 3 4 2 Label ABA to GMS Knob with stud Truarc ring Shelf ABA to GMS mtg Manifold assembly ABA to GMS Support guide ABA to GMS Screw M5 x 12 Instal inst Arm Assy Vent Bellows Mtg Groove pin Washers flat 2 Screw 10 x 24 x 1 2 3 Lubriplate Filter disposable w tube Washer 6 4 mm ID x 14 3 mm OD Screw M6 Pawl w o pin pivot Plate vent and bellows mtg Flange mtg post Arm vent mtg bracket Thumb screw Label Instal inst Kit Exh VIv Manifold Diaphragm assembly 2 Manifold assembly Gasket manifold O rings 2 Instruct pkg amp parts 1503 0151 000 3 27 97 1503 8001 000 1503 8002 000 1503 8003 000 1503 8004 000 9 Accessories Miscellan
63. Sensor Expiratory Flow Sensor O Concentration Power Supplies Battery Backup system Multiplexer and Buffer Amplifier The multiplexer settles quickly within 8 u sec to 0 01 to be stable for the ADC 12 Bit conversion and to maintain the overall 20 u sec conversion time The sys tem bandwidth requirement is from dc to 20Hz The multiplexer is an 8 channel fault protected device and the amplifier used as a buffer to drive the A D converter AD820AR A D Converter The MAX191BCWG is a 12 Bit converter that operates from a single 5 Volt power supply The clock frequency to run the A D converter is 1 048MHz It is derived from the microprocessor system clock With a 1 048MHz clock the conversion time of the A D converter is 13 clock peri ods or 12 4 u sec plus the 3 u sec required for the track hold amplifier The re sulting conversion time for the A D converter is 15 4 u sec The MAX191BCWG has the following unadjusted dc accuracy specifications 2 20 Integral Nonlinearity 1 LSB max Differential Nonlinearity 1 LSB max guaranteed monotonic Full Scale Error 3 LSB max Unipolar Offset Error 2 LSB max 1503 0151 000 3 27 97 2 Theory of Operation Voltage Reference Voltage reference is internal to the MAX191BCWG and adjusted with a potentiom eter This reference voltage is buffered and used for the digital to analog converter reference Flow Valve Control The flow valve control circuit consists of a D A convert
64. Serial Communication ELECTROLUMINESCENT SERIAL Channels DISPLAY 0 MICRO CONTROLLER SYSTEM 85 132 or 190 270 POWER MEMBRANE VAC 47 63 Hz _ SWITCHES SUPPLY AND OPTICAL ENCODER VENTILATOR ON OFF MACHINE Oo Flush interlock Machine DIGITAL DIGITAL TO ANALOG vo ANALOG DIGITAL CONVERSION CONVERSION GAS INLET 3 VDC MANIFOLD PRESSURE VALVE JAME PRESSURE LIMIT SWITCH INSPIRED BRESSURE U O SENSORS SENSOR N O 100 cmH20 PON o SENSOR SENSOR Electronic functional block diagram 1503 0151 000 3 27 97 2 9 2 Theory of Operation 2 10 Power Supply Assembly The power supply board encompasses two functional blocks power supply and external interface Power Supply The power supply is divided into three stages acto dc Conversion dc Step down Regulator and Battery Charger Multiple Output dc to dc Converter Functional Specifications Autoranging input 85 132 and 190 270 Vac 47 63 Hz 54 5 VA Output 5V for digital circuit 5 5V for electromechanical actuators 14 5 V for EL display and 15V for analog circuits Approval to UL 544 CSA VDE IEC 601 and other applicable med ical product standards e Leakage current under 300 micro Amps 132 Vac 60 Hz Output short circuit over voltage protection with automatic recov ery after removal of fault Battery under voltage disconnect function protects charging bad cell
65. Sung Building 36 1 Yoido Dong Youngdeungpo Ku Seoul Korea Tel 82 2 786 7421 Fax 82 2 786 7420 Malaysia Datex Ohmeda Pte Ltd Level 2 Bangunan O Connor 13 Jalan 223 46100 Petaling Jaya Selangor West Malaysia Tel 603 754 7872 Fax 60 3 757 6948 Singapore Datex Ohmeda Pte Ltd 152 Beach Road 12 05 07 Gateway East Singapore 189721 Tel 65 391 8618 Fax 65 291 6618 Thailand Datex Ohmeda Pte Ltd 12th Floor Unit F Grand Amarin Tower 1550 New Petchburi Road Makasan Rajathevi Bangkok 10320 Thailand Tel 66 2 2071012 13 Fax 66 2 207 1014 Taiwan and Philippines Datex Ohmeda Pte Ltd 2nd Floor No 85 Chien Kuo North Road Sec 2 Taipei Taiwan Republic of China Tel 886 2 2515 0457 Fax 886 2 2501 9136 Vietnam Datex Ohmeda Pte Ltd 522G Nguyen Tri Phuong St Ho Chi Minh City Dist 10 Vietnam Tel 848 865 5875 Fax 848 862 5501 Australia Datex Ohmeda Pty Ltd Units 1 amp 2 149 Arthur Street P O Box 356 Homebush NSW 2140 Australia Tel 61 132 229 Fax 61 297 461796 Europe France Datex Ohmeda S A S Parc de Pissaloup BP 10 8 Avenue Jean d Alembert F 78191 Trappes C dex France Tel 33 1 30 68 60 00 Fax 33 1 30 68 60 01 Cvr Chg 06 00 1503 0151 000 0397A 1604 19 Printed in USA Datex Ohmeda Inc Datex Ohmeda S A S 17 rue Jean Elys e Dupuy F 69410 Champagne Au Mont d Or France Tel 33 130 68 60 00 Fax 33 4 78 43 26 58 Germany Datex Ohmeda Gmb
66. T20UT TOOB z 2 Ri LDR RIIN TSO_RXDA x c32 10 V 4 JUF 35v 1 178W TP2 X 5 Bn C98 0 001UF 10 50V P2 SIGNAL CHAS GND 10 11 1 c101 1 8W L 0 1UF 163 50V CR29 CR30 SMBJIOCA SMBJ16CA SH1 Ww C113 0 01uF 10 Ww 250v 05 D822AR R85 i24k 61861ur T E s sui gPATILCUR SEN 10 CR1l SMBJIOCA SIGNAL CHAS GND 5 6 SH4 SH4 U5 AD822AR R71 49 9K Figure 8 19 Power supply board schematic diagram page 3 of 5 8 20 7900 Ventilator 1503 0151 000 1 97 8 Schematics CR24 SMBJ16A TO MICRO BOARD Pl TO SIB BOARD PAT_RET m SMBJ6 0A 26 AGND PRES INSP 2 INSP RET 27 AGND PRES_EXP 28 AGND 4 15V_SIB O2 RET 29 AGND 5 15V_SIB SES m SIB_PWR 10 30 AGND SH3 V_BATT 11 6 15V_SIB VDD HS I BATT 12 CR25 13 7 SH1 SH3 SH3 SH3 SH3 TXDA 26 RXDA 27 TXDB 28 RXDB 29 32 AGND CR22 LO_02_SW 15 8 PRES PAT suBJiex H8 33 PAT_RET 9 PRES_INSP DCGO_SW 18 34 INSP_RET BAG_VENT_SW 19 10 PRES EXP l EXT_SW1 20 exer l n oe i orr CC 23 12 AGND M Sic MAIN POWER ON 24 37 AGND CHG DISABLE 25 m n 02 FLUSH m a fe Jw ofu jo UI DCGO DCGO BAG VENT Tox Ripoz idor box T ook Boor ook S ook sut AC_LED_A 30 BAG VENT TE 1 8w iew i sw iau iow Teu len iau AC LED C 31 16 REM_ON WY 41 REM_ON NPZ DGND 33
67. TUNT TUBING LOW INSPIRATORY TRANSDUCER HIGH AND AIRWAY PRESSURE MONITOR 7900 Ventilator 1503 0151 000 1 97 8 3 8 Schematics SIB INTERFACE CONNECTOR REM ON 4 POSN CONNECTOR OE V 2 02 FLUSH FASTON CONNECTOR 02 FLUSH FASTON CONNECTOR SIB INTERFACE CONNECTOR I LE O m Co D Qn ro o P CHAS GND RING TERM Figure 8 3 Patient interface cable Machine side F 9 POSN SHIELDED MALE D CONNECTOR AMP PN 748038 1 OR EQUIVALENT HEAT SHRINK TUBING BLACK WITH ADHESIVE WALL 12 7 ID RAYCHEM PN DWP 125 3 1 BLACK OR EQUIVALENT MINITURE CABLE TIE PANDUIT PN PLTIM XMR OR EQUIVALENT 2 CONDUCTOR SHIELDED CABLE 22 AWG 20 in CABLE DIA PVC INSULATED UL STYLE 2095 300V 80 C ALPHA PN 5102C OR EQUIVALENT 3 PL 4 POSN RECEPTACLE CONNECTOR AMP PN 103957 3 OR 690 1562 3 POSN 4 L3 un N BROWN cem CONNECTOR soc cO 8 4 7900 Ventilator 1503 0151 000 1 97 POSN 1 INSULATED FASTON 250 SERIES 22 18 AWG AMP PN 2 520183 2 OR EQUIVALENT 4 PLACES RING TERMINAL NO 8 22 18 AWG AMP PN 55847 2 OR EQUIVALENT 3 PL FOR M4 STUD 02 FLUSH CONNECTORS DUAL COMMON GAS OUTLET CONNECTORS 8 Schematics Coded yellow Expiratory transducer high Coded blue Expiratory transducer low Coded black Inspiratory transducer low Patient interface cable connect SIB 7900 Vent in
68. Test Go To Main Menu Test Front Panel Test Front Panel Directions Follow the directions listed below If the correct button or knob is not pressed turned within 20 seconds the test will fail Notice that each button knob has a number displayed next to it Press each button knob from 1 10 TEST PASSED Turn the encoder knob one complete turn clockwise TEST PASSED Turn the encoder knob one complete turn counter clockwise TEST PASSED 8 1 Go To Main Menu 1503 0151 000 5 26 0 4 Tests and Troubleshooting 1 Test Front Panel Test Front Panel Directions Follow the directions listed below If the correct button or knob is not pressed turned within 20 seconds the test will fail Notice that each button knob has a number displayed next to it Press each button knob from 1 10 TEST FAILED Turn the encoder knob one complete turn clockwise TEST FAILED Turn the encoder knob one complete turn counter clockwise TEST FAILED 8 1 Go To Main Menu Panel Switch FAIL Instructions If any of the select buttons or the adjustment knob turn test fails replace the front panel board or the control wheel 1503 0151 000 5 26 0 4 9 4 Tests and Troubleshooting 4 10 Test Serial Ports The software performs an internal test on both of the serial ports The software sets up the serial ports so any data sent out the serial ports is echoed directly back to that serial port The test fails if the data sent out is not equal to
69. a Ee aet wem a e 4 5 TeshElash HOM usd duco eed ec PRO Hes Gaede c bee a i eg 4 6 TesEEEPRONM S ra 2 ribu buna a ea Shik Gate da seus d end 4 7 Test Panel Switches u rosa doe ee Res ee e e goat a duode fs 4 8 MEST eo ileal POPIS Xeon va aset Ao tah ya at DUE eb ecd iet 4 10 Test Flow Valve 232i esame ear atr RERO ies Ctt i et E CE 4 11 Test Gas Inlet Valve GIV Ceci 2a sce eee ade SE aaa ER Ruta Ope SR ee 4 12 Gas Inlet Valve FAIL Instructions _ 4 12 Test Pressure Limit Switch lille 4 13 Pressure Limit Switch FAIL Instructions 4 14 4 4 DiagnespicIgolS s iu dos ota ed eae ode ER AM eat dos Pie dear oae 4 15 Display A D channels eruere eee ER e ettet a 4 15 Display VO signals ae RR URS 4 16 Display Battery Charge Status 4 17 System Error Log cds ae he ad Lee a NADA n EAM tars 4 18 System Error Log Codes a us bes Deere t EAR SR ERE PE ES 4 19 Ver FOW aces che th md rues due Saha as dono tios Citta E sede d suec 4 23 45 GalibrationiS soe x too e e ns ne RUR D bubo sq Funk Und tor Neco Dd ar hal i 4 24 Calibrate O2 Sensor ss tite tae aote de accro Sa OU eda RUP n RS 4 24 Calibrate Flow Sensors EV EEREEE 4 25 Calibrate Pressure Sensitivity 4 28 Calibrate Flow Valve 4 30 Calibrate Bleed Resistor
70. angement allows a full scale output swing of 0 to 20 mA for an input of 0 200 to 2 700 Vdc Patient Airway Pressure is measured off the high side of the inspiratory transducer A pressure range of 20 to 120 cmH5O produces a proportional dc output voltage in the range of 0 050 to 4 050 volts with zero pressure producing 0 621 volts This voltage is reduced by a voltage divider and applied to a current transmitter as de scribed above with the exception that no offset voltage is used 1503 0151 000 3 27 97 2 Theory of Operation O2 Concentration Measurement The Oxygen sensor generates a linear output voltage that depends upon the con centration being measured It produces an output of 57 14 mV dc at 100 con centration therefore its output is amplified by a factor of 52 to make it compatible with the current transmitter This produces a maximum output of 2 50 volts The 0 to 20 mA current signals are sent to the Ventilator where a voltage drop is produced across 200 ohm resistors for a 0 to 4 00 volt signal to be measured by the A D converter Switch Connections The SIB is used as a connection point for the various switches that indicate the state of the machine These include the O flush the Power On switch the DCGO switch fitted to French SE anesthesia machine and the Os pressure switch mount ed on the SIB 1503 0151 000 3 27 97 2 25 2 Theory of Operation Notes 2 26 1503 0151 000 3 27 97 3 Post Service Che
71. any of the SIB interconnecting hoses 6 9 SIB Removal from Excel Modulus SE 1 Black color coded pneumatic hose interface panel expiratory flow sensor to SIB 2 Yellow color coded pneumatic hose interface panel inspiratory flow sensor to SIB 3 Blue color coded pneumatic hose from interface panel expiratory flow sensor to SIB 4 Natural color coded pneumatic hose interface panel inspiratory flow sensor to SIB SIB assembly SIB assembly mounting screws Machine interface harness to SIB J3 Pneumatic tubing from O2 supply to sense detect Oo failure Cable connection to O flush valve French units only Cable to DCO select switch Cable from sensor interface panel to SIB J1 Cable from ventilator to SIB J2 Interface panel mounting may vary depending on machine configuration to Oo o m O Figure 6 35 SIB assembly cable and pneumatic hose identification Excel 210SE shown 1503 0151 000 5 26 0 6 41 6 Repair Procedures CAUTION 6 42 The SIB mounts under the gas machine s work surface in the component compart ment area 1 The SIB is replaced as an assembly and is shipped as a replacement part with cable connectors and quick connect color coded hose fittings for the pneu matic hoses that attach between it and the interface The flow sensors have two pneumatic hose connections and an electronic ca ble connection each The hose connections are color coded so connections be tween the interface
72. as flow to 10 Lpm 3 Occlude the patient circuit at the Y connector 4 Remove the pressure gauge 5 Set ventilation switch to Ventilator mode 6 Select Start Test to start the test 7 When test complete replace pressure gauge Current test status Testing Start Test Go To Main Menu Test Pressure Limit Switch Directions for testing 1 Turn mechanical ventilation on the green LED should be on 2 Setthe fresh gas flow to 10 Lpm 3 Occlude the patient circuit at the Y connector 4 Remove the pressure gauge 5 Set ventilation switch to Ventilator mode B Select StartTest to start the test 7 When test complete replace pressure gauge Manifold pressure when pressure limit switch engaged 107 421 cmH Current test status Pass Start Test Go To Main Menu 1503 0151 000 5 26 0 4 13 4 Tests and Troubleshooting 4 14 Test Pressure Limit Switch Directions for testing 1 Turn mechanical ventilation on the green LED should be on 2 Setthe fresh gas flow to 10 Lpm 3 Occlude the patient circuit at the Y connector 4 Remove the pressure gauge 5 Set ventilation switch to Ventilator mode 6 Select Start Test to start the test 7 When test complete replace pressure gauge Current test status Start Test Go To Main Menu Pressure Limit Switch FAIL Instructions Go to the Discrete I O signal menu and check the DPL Drive Pressure Limit switch status Disconnect pre
73. as inlet valve electrical feedback Supply voltage checks Battery voltage checks These tests are run periodically every 30 seconds during normal operation and alarms are associated with each test A failure causes an alarm to display on the screen in the alarm display area See section 4 7 of this chapter and the Appendix in the O amp M Manual CPU Test Display RAM walking pattern test Data RAM walking pattern test FLASH ROM CRC verification This test runs only at boot up when mechanical ventilation is turned off Gas inlet valve electrical and pneumatic If the gas inlet valve fails on power up an alarm occurs and is displayed appropri ately Gas Inlet Valve Circuit Failure Also an error code 1002C will register on the error code service mode menu If the self test has passed the remainder of the service troubleshooting is checking the system visually and running the tests from the Service Mode Menu 1503 0151 000 5 26 0 4 Tests and Troubleshooting 4 2 Service Mode Menu The service calibration mode tests and or calibrates hardware necessary to pre pare a ventilator in the plant for factory shipment and to service a ventilator in the field Tests may be run manually with the rotary encoder also called the adjust ment knob To enter this service mode push and hold in the adjustment knob at power up until the Service Confirmation menu appears Then select Service Mode from this menu Another me
74. asic timing reference for the Baud Rate Generator Configuration Both of the serial communication channels are configured as full duplex asynchro nous RS232C ports The internal Baud Rate Generator establishes the communi cation baud rate with an upper limit of 38 4k Baud Special Operating Modes The serial channels are capable of operating in various looping modes for self test ing as well as for remote testing of serial communications These tests include au tomatic echo local loop back and remote loop back 1503 0151 000 3 27 97 2 Theory of Operation Program Memory Flash EPROM Two 128K x 8 Flash memory devices are used with on board expansion capability to 512K x 8 devices This memory contains the real time operating system RTOS and software code The Flash memory devices are socketed System RAM This memory consists of two 32K x 8 CMOS static RAMs with on board expansion capability to 512K x 8 SRAMs Non Volatile Memory This memory consists of a single 2K x 8 EEPROM and stores information which needs to be retained when the system is powered down This includes user se lectable operating parameters and a system error log Safety Relevant Computing This section addresses the Safety Relevant Computing SRC requirements of DIN V VDE 801 The electronic hardware design provides the necessary capability for meeting these requirements This includes Digital monitoring of selected control signals Anal
75. ation Status Calibrating Go To Main Menu 1503 0151 000 5 26 0 4 31 4 Tests and Troubleshooting 4 32 Bleed Resistor Calibration Directions for bleed resistor calibration 1 Select the drive gas using the Select drive gas page 2 Select the altitude using the Select altitude page 3 Perform the Cal flow valve perthe directions on that page 4 Occlude the patient circuit at the Y connector 5 Setthe fresh gas flow to 10 Lpm 6 Turn mechanical ventilation on the green LED should be on 7 Set ventilation switch to Ventilator mode 8 Selectthe Start Cal selection and push the rotary encoder switch 81 510 cmH 0 49 162cmH 0 22 039 cmH 0 72 770cmH 0 41 557 cmH 0 16 967 cmH 0 64 168 cmH 0 33 916cmH 0 12 019 cmH 0 956 205 cmH 0 27 232 cmH 0 3 164 cmH 0 Bleed Calibration Status Pass StatCal si Go To Main Menu Remarks If the bleed resistor calibration test fails check altitude and drive gas settings Ensure that the breathing circuit gas is exhausting out the scavenging port during the test A negative finding indicates a massive circuit leak Check for proper regulator pressure calibration Ensure that the Flow Valve Cal test was con ducted properly Otherwise failure indicates a calibration problem with the flow valve 1503 0151 000 5 26 0 4 Tests and Troubleshooting Remarks The calibration is performed as follows 1 ar woh Open the flow valve to the starting point that was fo
76. ay A D menu Ensure that the flow sensors are disconnected from the interface panel If the transducer is out of tolerance replace the SIB assembly 1503 0151 000 5 26 0 4 27 4 Tests and Troubleshooting Calibrate Pressure Sensitivity The software prompts the user to perform the procedure to calibrate the pressure sensitivity This pressure transducer calibration is to be performed if the SIB control module or microcontrol board is replaced This calibration is not an automated calibration It prompts the user to follow a set of procedural steps to perform the calibration This calibration calculates the pressure sensitivity at 5 different pres sures It uses these five different pressure points along with the inspiratory flow and expiratory flow zero offsets to find the pressure sensitivity If the calculations for the pressure sensitivity are not within the correct tolerance the calibration fails If the calibration passed the five pressure sensitivity points are stored in the EEPROM Pressure Sensitivity Calibration Directions for pressure sensitivity calibration Perform the Cal flow sensors per the directions on that page Set fresh gas flow to 10 Lpm Occlude the opening at the bag arm Connect short patient tubing from insp flow sensor to exp flow sensor Set ventilation switch to Bag APL mode Turn mechanical ventilation on the green LED should be on Select the Start Cal selection and push the rotary encoder s
77. b Epoxy center hole 0 5 in ID Full wave bridge voltage doubling with auto voltage adapter GBUSD 8A 200V 300A JEDEC Method 92 95 2 x 5600uF 63WVdc 3 93A allowable ripple current at 120 Hz 85 C 2000 hr load life at 85 C 50V 3 93A 120 Hz rip lt 2 5 Vp p 24 62 Vdc 140 155 Vac 2 11 2 Theory of Operation 2 12 ac Power On Indicator Type LED Color Green LED drive current 15mA Location Display Board ac Step Down Regulator and Battery Charger The dc step down regulator takes the output from ac dc conversion stage 24 62 Vdc and converts itto 16 6 Vdc The battery charge circuit charges the sealed lead acid battery anytime ac power is supplied A Schottky Diode provides uninterrupted power supply UPS function during ac powered to battery powered transitions When ac power is interrupted the switch over between ac and Battery is automatic When ac power is off this diode also works as a reverse blocking device preventing the battery from being drained by the regulator circuitry Synchronous step down regulator Power efficiency 80 85 Input voltage range 24 62 Vdc Switching Controller MAX797 Switch devices 100V 19 284 0 20 0 07 ohm MOS FETMTW 4510E IRF540 Output Ripple Less than 200mV peak to peak dc output voltage 16 6 V Lead acid battery charge controller The battery charge circuit charges the sealed lead acid battery anytime ac power is suppli
78. bleshooting Error Code Description of error logged Service Action 10031 Minimum system monitoring 1 Refer to Section 4 Display A D Channels caused by flow sensor EEPROM _ Test Flow Sensors Replace faulty flow sen failure sors 2 Check cable connections at SIB and the SIB to 7900 cable 3 Replace the SIB 4 Replace the CPU board 10032 Minimum system monitoring 1 System has DCGO in aux position but caused by DCGO French language not set to French 2 Check Discrete I O Signal menu for sta tus 3 Check SIB cables 4 Replace CPU board 10035 Non volatile memory EEPROM Reboot the system if problem continues data out of range replace the CPU board 10036 Non volatile memory EEPROM Reboot the system if problem continues region protected value error replace the CPU board 10038 1 of 3 safety relevant parameter Reboot the system if problem continues areas has difference in SRC tripli replace the CPU board cate storage external RAM prob lem 10039 All 3 safety relevant parameter Reboot the system if problem continues areas are different in SRC storage replace the CPU board external RAM problem 1003A There are no more EEPROM Reboot the system if problem continues areas to switch to EEPROM prob replace the CPU board lem 1003D Minimum system monitoring Reboot the system if problem continues caused by system parameter fail replace the CPU board ure external RAM problem 1003E Minimum system
79. board Note the connector has lock tabs Squeeze to re lease Disconnect the second ribbon cable connector J3 between the micro control ler board and the power supply board Disconnect the ribbon cable connector J5 between the microcontroller board and the front panel circuit board Connector has lock tabs Note the routing of this cable through the slot in the chassis Disconnect the cable connector J1 from the alarm speaker to the microcon troller board Not shown Disconnect the cable connector J4 from the isolation transformer to the power supply board Completely loosen the two 2 captive securing screws at the top two corners of the board It may require an off set flat blade screwdriver to loosen initially Use the 7 mm nut driver to loosen the hex nuts on the bottom angle mount of the board It is not necessary to take the nuts completely off The chassis studs are in key hole slots slide the board back and lift it off and out of the chassis 1503 0151 000 5 26 0 6 Repair Procedures 1 Power supply board has two captive securing screws Finger tighten low torque 2 Power supply board 3 Power supply board connector for isolation transformer cable 4 Key hole slots for angle mounting flange 5 Battery connection J1 to power supply board See step 5 in previous proce dure Figure 6 11 Removing the power supply board 1503 0151 000 5 26 0 6 13 6 Repair Procedures Removing Microcontroller circ
80. ckout After servicing the ventilator run any service menu tests that are pertinent to the components replaced Perform calibration on Flow sensors Pressure sensitivity Flow valve and Bleed resistor You must complete the checkout procedure for the entire system the ventilator the anesthesia system and all the accessories and options WARNING A You must perform all post service checks after maintenance or service of the ventilator Failure to do so may result in patient injury WARNING All components and accessories must be connected correctly All hoses and cables must be properly connected before returning the anesthesia system to clinical use Failure to do so may result in patient injury 3 1 Test the Ventilator Perform section Preoperative checkout procedure found in the Anesthesia Sys tem Operation and Maintenance Manual 3 2 Test the Anesthesia System The ventilator is an integral part of a complete anesthesia system To be certain the ventilator is functioning correctly it is necessary to test the entire system Please refer to the anesthesia system manuals Important If you have an Ohmeda Excel SE Anesthesia System complete the system checkout procedure in the Excel SE Service Manual If you have an Ohmeda Modulus SE Anesthesia System complete the system checkout procedure in the Modulus amp SE Service Manual 3 3 Test all Options and Accessories Complete the checkout procedures for all options a
81. coder switch Encoder harness connect to front panel Encoder switch Locking washer Tab align tab into hole in circuit board Flat washer Mounting nut use 14 mm wrench Knob spring friction D shaft NO o BOND Figure 6 17 Replacing the encoder 1503 0151 000 5 26 0 6 21 6 Repair Procedures Removing the battery Foam battery retainer Battery harness route through cutout item 4 Battery Hole for battery harness routing Power module bracket assembly with slot for ribbon cable 1 2 3 4 5 Figure 6 18 Battery removal 6 22 1503 0151 000 5 26 0 6 Repair Procedures See previous illustration numbered callouts Remove the foam battery retainer Disconnect the battery cable connector from the power supply board Lift the cable out of the slot in the power module Remove battery and dispose of according to local regulations ON e EE OAO om Install a properly conditioned replacement battery in reverse order of removal Important Check the conditioning date marked on the replacement battery Do not install a battery which is 60 days past the conditioning date If the replacement battery is 60 days past the conditioning date re turn the replacement battery or dispose of according to local regu lations Testing After Maintenance 6 Perform section 4 Test and Calibration and then section 3 Post Service Checkout 7 Charge the battery for 24 hours before returning th
82. d it out through the opening made by cover removal 5 Disconnect the gas supply hose from the gas machine power outlet and thread it out through the opening made by panel removal 6 Loosen the securing knob under the ventilator on the right hand side Pull the ventilator back so it is flush with the back of the gas machine housing Remove the cable from the ventilator to the SIB board and the RS232 serial port connection if applicable CAUTION A The ventilator weighs approximately 40 pounds Use care in its removal 9 See Section 6 3 service shelf setup 1503 0151 000 5 26 0 6 3 6 Repair Procedures Removing the 7900 ventilator from the non integrated machine The non integrated ventilator mounts on a shelf which mounts into a shroud that is open in the rear and has rear and bottom access to hoses or cables 1 Ventilator 2 Ventilator shroud Figure 6 3 Excel 210 without mid shelf and non integrated 7900 ventilator Non integrated the anesthesia machine has no mid shelf and the 7900 fits ina shroud mounted to the under side of the top shelf CAUTION ZA Do not pull the exhalation valve manifold hoses straight down from the block assembly to remove them Too much force is needed if you pull straight down This added force can cause the hoses to release suddenly and possibly cause damage the valve block or cause injury to the person removing the hose To remove the hoses use a careful light twisting back and forth mo
83. de 7 11 MOBO Mechanical Over pressure Bleed Off valve 7 12 Manifold components continued 7 13 Exhalation manifold latch assembly 7 13 Supply gas filter assembly 7 14 Free breathing valve cs el eta locis erp ete eine 7 14 Exhalation manifold valve 7 15 SIB Sensor interface board assembly 1503 8009 000 7 15 Patient interface board assembly 7 16 System connection block diagram 8 2 SIB schematic diagram interface cable connections 8 3 Patient interface cable Machine side 8 4 SIB interface hose and cable routing 8 5 7900 SIB schematic diagram page 1 of 2 8 6 7900 SIB schematic diagram page 20f 2 8 7 Microcontroller board schematic diagram page 1 of 10 8 8 Microcontroller board schematic diagram page 2 of 10 8 9 Microcontroller board schematic diagram page 3 of 10 8 10 Microcontroller board schematic diagram page 4 of 10 8 11 Microcontroller board schematic diagram page 5 of 10 8 12 Microcontroller board schematic diagram page 6 of 10 8 13 Microcontroller board schematic diagram page 7 of 10 8 14 Microcontroller board schematic diagram page 8 of 10
84. de the drawer open to ac cess the SIB mounting screws on the underside of the pan Remove the two mounting screws Note On machines that had the 7900 ret rofitted in the field the SIB is mounted to a plate The Mounting Plate mounting screws are forward of the mounting screws shown in Figure 6 35 at the two forward corners of the plate The SIB is attached to the mounting plate with two screws that are in the same location as shown in Figure 6 35 Carefully slide the SIB assembly forward until the transducer connections clear the gauge panel Remove the assembly from the pan 1503 0151 000 5 26 0 6 Repair Procedures Replacement Calibration Instructions SIB If the SIB must be replaced follow the Replacement Calibration Instructions for the Microcontroller Board See Removing Microcontroller circuit board at the be ginning of this section Prior to placing the system in operation all procedures in section 4 and the preoperative checkout must be completed CAUTION A Do not disconnect the hoses while the SIB is under pressure This may damage the SIB components Ensure the flow transducers are not pres surized by removing the breathing circuit before disconnecting any of the SIB interconnecting hoses 6 10 Patient Interface Harness Removal from Excel SE Note The Patient Interface Panel Harness is replaced as an assembly which includes the flow transducer connectors oxygen sensor connector interface harness t
85. des of operation Easier to service fewer components and improved performance 2 2 1503 0151 000 3 27 97 2 Theory of Operation Safety Features Dualredundant airway over pressure protection linked to the Pmax setting Volume over delivery limits and protection e Ohmeda proprietary hose connections fixed manifolds to reduce leaks Uses proven mechanical components 10 VA Oxygen compartment separation 500 psi burst protection 2 2 Mechanical 35 100 psi Supply inlet Supply Outlet Gas Hose Figure 2 3 Supply gas inlet filtered Supply Gas which can be powered from O2 or Air is supplied from the anesthesia machine at a pressure of 241 to 690 kPa 35 to 100 psi This supply gas is filtered through the 5 micron filter and water trap to further eliminate any minute particles of contaminate The filter does not significantly reduce the output pressure on the downstream side of the filter 35 100 psi 35 100 psi Supply inlet Supply Gas Hose Outlet Figure 2 4 Gas Inlet Valve 1503 0151 000 3 27 97 2 3 2 Theory of Operation During normal operation the GIV Gas Inlet Valve is open to allow the supply gas to flow to the ventilator manifold This valve provides a shut off of the supply gas to the ventilator when the ventilator is not in use The GIV also shuts off supply gas to the ventilator under failure conditions as the microprocessor or over pres sure switch demands The output
86. e quire removing the Ventilator from the Anesthesia Machine WARNING Section 4 Test and Troubleshooting must be performed whenever you remove a Ventilator cover to verify that all critical parts of the Ventilator are still operational and within specification WARNING A After the Ventilator has been serviced you must perform Post Service Checkout to verify the entire Anesthesia System is properly functioning before the system can be returned to clinical use WARNING Do not perform testing or maintenance on this instrument while it is be ing used to ventilate a patient possible injury may result 1 4 7900 Ventilator Configuration The 7900 Ventilator hereafter called Ventilator is an integral part of the Modulus SE and the Excel SE Anesthesia Systems This Ventilator is not available for use as a stand alone piece of equipment The Ventilator is composed of two basic units the breathing circuit interface ABA Autoclavable Bellows Assem bly Bellows and Bellows Housing the Control Module containing the control valves processing cir cuits controls monitors and display screen Software Versions This manual includes test and calibration procedures for Revision 2 X software As software is revised and updated the revision level is displayed on the ventilator start up menu 1503 0151 000 5 26 0 1 5 1 Introduction Notes 1 6 1503 0151 000 5 26 0 2 Theory of Operation ZZZ2 1 General Th
87. e alarm is not active the text Sensor s Cal Due Alarm Not Active will appear and the only selection will be Go To Main Menu Sensor s Cal Due alarm not active No calibrations required Go To Main Menu 1503 0151 000 5 26 0 4 Tests and Troubleshooting 4 6 User Settings These setting are for the convenience of the service person so they can make changes without having to go back to the main operating menus Select Altitude This provides the user with the means to select the altitude setting Displays Select Altitude SelectAltitude EOM Go To Main Menu Select Drive Gas This provides the user with the means to select the drive gas Displays Select Drive Gas Select Drive Gas Go To Main Menu 1503 0151 000 5 26 0 4 35 4 Tests and Troubleshooting Adjust Brightness This provides the user with the means to select the display brightness Adjust Brightness Adjust Brightness 3s Go To Main Menu Select Heliox Mode This provides the user with the means to select the Heliox mode with systems hav ing ANSI gas systems with Heliox flow tubes installed Set Select Heliox Mode to Available to allow the user to turn Heliox mode on or off during the normal opera tions mode Set Select Heliox Mode to Not Available to prevent the user from turning Heliox mode on during normal operation Select Heliox Mode Select Heliox Mode Available Go To Main Menu 4 36 1503 0151 000 5 26 0 4 Te
88. e 7900 Ventilator is a microprocessor based electronically controlled pneumat ically driven ventilator with a built in monitoring system for inspired oxygen airway pressure and exhaled volume The 7900 is a Closed Loop Control Ventilator Sensors in the breathing circuit are used to control and monitor patient ventilation as well as measure inspired oxygen concentration This allows for compensation of compression losses fresh gas contribution valve and regulator drift and any small leakage in the breathing absorber bellows and system User settings and microprocessor calculations control breathing patterns The 7900 has a user se lectable Heliox mode to allow gas composition compensation when Heliox gas is used User Inputs 9 Soft keys O2 Pressure 1 knob AC Power 35 100 psi Suppy O2 Flush Ventilator Control Module Optional Communications Cable AGSR Gas Scavenging Y To Vacuum Exhaust Gas Absorber GMS 5 Mk5 Flow Sensors Valve Absorber Manifold Bellows SIB System Interface Panel Figure 2 1 7900 Ventilator Excel SE and Modulus SE Anesthesia System Interface User interface settings are stored in non volatile memory The user may change settings with a simple and secure setting sequence A bellows contains breathing gasses to be delivered to the patient Positive End Expiratory Pressure PEEP is regulated electronically Positive pres sure is maintained in
89. e Oxygen sensor For noise immunity the signal outputs from the board are transmitted as 20 mA current signals Inspiratory and Expiratory Flow Measurement Differential pressure levels of up to 3 5 cmH5O are applied to the differential pressure transducers by the flow of gasses pastthe variable orifice This produces dc output voltages in the range of 0 200 to 2 700 volts with zero pressure produc ing 1 450 volts at the transducer and 2 000 volts at the A D controller in the Ven tilator Calibration data is stored in an EEPROM in each of these sensors When directed by system software a differential clock signal is sent to the SIB where it is transformed into a single ended signal for the EEPROMS An enable signal is also sent that turns on 5 Vdc power For noise immunity when the data has been read by the microcontroller board in the ventilator these signals are turned off Patient Airway Pressure Measurement When there is gas flow in the system the voltage produced by the differential pres sure transducer is applied to a current transmitter IC Used in the 0 to 20 mA mode its full scale input range is 2 500 Vdc In order to exactly match the transducer out put range the current transmitters are offset by 0 200 Vdc This is done by using the 2 000 volt reference generated by one of the IC s The reference voltage is re duced through a voltage divider and applied as a low impedance source by using a buffer amplifier stage This arr
90. e the CPU board 3 Replace PSB 10059 Minimum system shutdown exter Reboot the system if problem continues nal reference voltage failed replace the CPU board 1005A Minimum system shutdown bootup Reboot the system if problem continues memory failure replace the CPU board 2000D A switch for EEPROM region was Reboot the system if problem continues requested but there are no more replace the CPU board areas to switch to EEPROM prob lem 4 22 1503 0151 000 5 26 0 4 Tests and Troubleshooting Verify Flow The software allows the user to set the flow from 0 closed to 120 LPM The user can then verify that the flow output of the ventilator is correct and or that the flow sensors read the correct output Verify Flow Output and Flow Sensors Directions for verification 1 Turn mechanical ventilation on the green LED should be on 2 Disconnect the drive gas tubing from the breathing system 3 Connect external measuring device to the drive gas tube to test flow output 4 Connect flow sensor s to the drive gas tube to test the flow sensors 5 Select the Set Flow LPM 6 Set flow to the desired flow and push the rotary encoder switch 7 Verify correct flow appears 8 When verification is complete reconnect the drive gas tubing Inspiratory Flow 0 036 L min Expiratory Flow 0 162 L min Set Flow LPM Go To Main Menu Remarks Note Gas exiting through the bleed resistor must be accounted for o
91. e ventilator to clinical use a Switch ON system power to turn ON the ventilator b If Low Battery appears the message should go away within 5 minutes If the message does not go away the battery is not be ing charged properly c The system and ventilator must remain plugged in to charge the battery 1503 0151 000 5 26 0 6 23 6 Repair Procedures 6 24 6 6 Replacing the isolation transformer Removing the power module 1 Disconnect the ribbon cable from the front panel Squeeze the locking tabs on the connector Disconnect the alarm speaker cable from the microcontroller board Disconnect the isolation transformer cable from the power supply board If not already disconnected disconnect the battery cable 1 Route ribbon cable through the slot in chassis 2 Hex nut mounting on stud 3 Hex nut mounting on studs Figure 6 19 Power Module removal Use the 1 5 mm hex wrench to remove the screws from the a c power cord re taining clamp Disconnect the power cord from the a c inlet connector See figure 6 20 item 5 Use the 7 mm nut driver or open end wrench to disconnect the three ground wires from the power module Use the 7 mm nut driver to loosen the hex nuts on the angle brackets holding the power module to the chassis Align the nuts with the larger hole in the key hole slot and slide the power mod ule back to gain access to the hex nut holding the ground wires When ground wires are disconnected
92. eak 2 GIV leak 1 Bag APL Vent selector in Bag APL position 2 Drive gas hose disconnected or leaking 1 Microprocessor failure 1 50 position cable external cable SIB to 7900 2 Remote on off switch cable 3 Remote on off switch 4 Power supply board 1 Out of calibration 1 Slight to moderate valve leakage 2 O Ring Seal Housing to Main Manifold 3 Alignment of seat and seal after assembly 4 Loose mounting screws Action 1 Check bellows 2 Check the waste gas scavenging system for high vacuum or blockage 3 Control port plugged or drive gas inlet hose blocked 1 Check hose 2 Check GIV solenoid 3 Repair GIV 1 Place the Bag APL Vent selector in the Vent position 2 Reconnect drive gas hose or check for leaks 1 Replace microcontrol board 1 Ensure cable is plugged in prop erly at 7900 and SIB 2 Ensure cable is plugged in prop erly at switch and SIB 3 Replace switch 4 Replace power supply board 1 Calibrate 1 Check operation of drive gas check Valve 2 Replace drive gas check valve IMPORTANT If the ventilator experiences extreme electrical interference it may interrupt mechanical ventilation If this interruption occurs the ven tilator generates an internal reset function and resumes normal op eration after two 2 seconds For situations where continuous electrical interference is experienced by the ventilator causing a continuous interrup
93. ed This circuit is based on the Unitrode UC3906 charger controller which monitors and controls both the charging voltage and current through three sepa rate charge states ahigh current bulk charge state acontrolled over charge and aprecision float charge This sequence maximizes battery capacity and life while minimizing charge time Switch over circuitry detects the presence or loss of ac supplied power and provide an automatic and transparent transition to AC or battery power 1503 0151 000 3 27 97 2 Theory of Operation The charge time for the sealed acid battery from a discharged state to full capacity is 10 hours maximum Charge levels Bulk charge over charge and tempera ture compensated floating charge Bulk charge current 250mA c 10 Over charge voltage 14 7V at 25 C Floating charge voltage 13 7V at 259C Auto Charger Disconnect 7 56 to 8 08Vdc Auto Charger Disconnect Release 7 71 to 8 71Vdc ac to Battery Automatic Switch Circuit Battery connection Direct on dc bus Battery standby current 200 uA Multiple Outputs dc to dc Converter A single dc bus voltage either from the ac to dc converter or the battery is the input to a dc to dc converter MAX 796 similar to that used in the ac dc section The converter has the five outputs required by the system at appropriate power levels Post low drop regulators provide the most effective local regulation and high effi ciency with
94. eet reso he hae eae Sas ee E SES 4 18 Verify Flow Output and Flow Sensors 4 23 Calibrate O2 Sensor 4 24 Calibrate Flow Sensors 4 25 Pressure Sensitivity Calibration 4 28 Flow Valve Calibration 4 30 Bleed Resistor Calibration 4 31 Sensor s Calibration Due ve RARE x Rs 4 34 Select Altitude 213 6 5 a dain ea soe l dC dr EROR DAR e Sasa q 4 35 Select Drive Gas ss cepa vie PRU pae ur aoe S Read 4 35 Adjust BriglitiBss uie re doe es eR RUNE aes Guia au bae td es 4 36 Select Heliox Mode 4 36 Supply gas filter Filter assembly with bowl 1503 331 9 000 Filter element 1503 3320 000 5 2 Free Breathing Valve deflection tube and seat removal 5 3 Free Breathing Valve flapper replacement 5 4 3 27 97 List of Illustrations Section 6 Figure 6 1 Figure 6 2 Figure 6 3 Figure 6 4 Figure 6 5 Figure 6 6 Figure 6 7 Figure 6 8 Figure 6 9 Figure 6 10 Figure 6 11 Figure 6 12 Figure 6 13 Figure 6 14 Figure 6 15 Figure 6 16 Figure 6 17 Figure 6 18 Figure 6 19 Figure 6 20 Figure 6 21 Figure 6 22 Figure 6 23 Figure 6 24 Figure 6 25 Figure 6 26 Figure 6 27 Figure 6 28 Figure 6 29 Figure 6 30 Figure 6 31 Figure 6 32 Figure 6 33 Figure 6
95. embly 3 Filter bowl Figure 5 1 Supply gas filter Filter assembly with bowl 1503 3319 000 Filter element 1503 3320 000 CAUTION A Cross threading the filter bowl may cause debris to accumulate on the filter resulting in shorter useful life of the filter 5 2 1503 0151 000 5 26 0 5 Maintenance CAUTION A Once you start the threads on the filter bowl with the O ring mounted to the bowl do not back out the filter bowl unless you take the it all the way out and restart the mounting If the bowl is partially unscrewed or backed out from the manifold seat the O ring will slip out of place and result in an unacceptable leak Free Breathing Valve Maintenance 1 Remove the deflection tube of the free breathing valve CAUTION A The deflection tube will collapse and tends to close off if it is stored for a period of time without something to hold it open in its original shape 2 Unscrew the valve seat from the bottom of the control module man ifold it should be hand tight 121 6 14 Figure 5 2 Free Breathing Valve deflection tube and seat removal 1503 0151 000 5 26 0 5 3 5 Maintenance 3 Inspect the flapper and valve seat for nicks debris and cleanliness Pull the tail of the new free breathing valve flapper through the cen ter of the valve seat until it locks in place 5 Trim the tail in line with the bottom edge of the valve seat see figure 5 3 Figure 5 3 Free Breathing Valve flapper replacement 6
96. enoid on inlet valve body Mechanical over pressure bleed off valve MOBO Flow control valve Regulator non relieving note do not loosen remove Phillips head screws Exhalation valve handle mounts Pneumatic manifold from chassis Power cord guard Alarm speaker Flash EPROM Removal 1503 0151 000 5 26 0 Tools to remove replace Pozi Driv screwdriver No 2 7 mm nut driver or open end wrench 7 mm nut driver for ground wire 10 mm nut driver for large mounting bolt and Nyloc nut 14 mm nut driver for mounting nut 2 5 mm hex wrench 7 mm nut driver and 5 5 mm nut driver 7 mm nut driver amp offset flat blade screwdriver 7 mm nut driver amp offset flat blade screwdriver Straight blade screwdriver offset 7 mm nut driver 2 mm hex wrench 3 mm hex wrench Tru arc tool Hi Tech No 1221 5 3 mm hex wrench 1 5 mm hex wrench 3 mm hex wrench 2 5 mm hex wrench and align ment tool Stk No 1503 3124 000 3 mm hex wrench 4 mm hex wrench 2 5 mm hex wrench 2 5 mm hex wrench Pozi Driv screwdriver No 2 driver 5 mm open end wrench or nut driver 32 pin PLCC Chip Extractor POZI DRIV Trademark Phillips Screw Co 6 1 6 Repair Procedures 6 2 Removing the 7900 ventilator from the Ohmeda Excel Modulus SE Gas Machine There are two versions of 7900 ventilator anesthesia machine mounting Integrat ed and non integrated 1 Ventilator 2 Ventilator shroud 3 Middle shelf Figure 6 1 Excel 210 wi
97. ent hole Pressure switch harness BON Figure 6 33 Drive gas check valve removal CAUTION A The internal components of the Drive Gas Check Valve are precisely po sitioned Do not attempt to remove or reposition the glass sleeve or pis ton assembly 1503 0151 000 5 26 0 6 39 6 Repair Procedures 6 40 1 Use a3 mm hex wrench to loosen the drive gas check valve captive mounting screws Lift out the valve assembly Inspect the O ring and seat for damage Replace as necessary When installing the valve do not pinch the pressure harness item 2 Align check valve pin into the alignment hole in the manifold for proper orientation Tighten the captive screws Removing the pressure sensing switch assembly oosowm Pressure switch mounting screws Cable connector to microcontroller board J8 Pneumatic tube to main manifold Main manifold pressure switch pneumatic connection Q N Figure 6 34 Pressure sensing switch removal Disconnect the cable connector J8 from the microcontroller board Disconnect the hose item 4 from the manifold to the pressure sensing switch Use the 2 mm hex wrench to remove the pressure switch mounting screws item 5 1503 0151 000 5 26 0 6 Repair Procedures CAUTION A Do not disconnect the hoses while the SIB is under pressure This may damage the SIB components Ensure the flow transducers are not pres surized by removing the breathing circuit before disconnecting
98. eous Parts O amp M Manuals Revision 1 5 Domestic 1503 0140 000 Deutsch 1503 0141 000 Francais 1503 0142 000 Espanol 1503 0143 000 Italiano 1503 0144 000 Japanese 1503 0145 000 Svenska 1503 0152 000 Revision 2 x Domestic 1503 0177 000 Deutsch 1503 0178 000 Francais 1503 0179 000 Espanol 1503 0180 000 Italiano 1503 0181 000 Japanese 1503 0182 000 Swedish 1503 0183 000 Danish 1503 0184 000 Polish 1503 0185 000 Hungarian 1503 0186 000 Czech 1503 0187 000 9 2 1503 0151 000 3 27 97 o Datex Ohmeda Corporate Office Xo Ts Datex Ohmeda Division Instrumentarium Corp PO Box 900 FIN 00031 Helsinki Finland Tel 358 10394 11 Fax 358 9 146 3310 North America United States Customer Service and Distribution Center Datex Ohmeda Inc Ohmeda Drive PO Box 7550 Madison WI 53707 7550 USA Tel 1 800 345 2700 Fax 1 608 221 4384 Technical Support Datex Ohmeda Inc Three Highwood Drive Tewksbury MA 01876 USA Tel 1 800 345 2755 Sales and Service Datex Ohmeda Inc Three Highwood Drive Tewksbury MA 01876 USA Tel 1 800 635 6099 Fax 1 978 640 0469 Equipment Service Center Datex Ohmeda Inc 1315 West Century Drive Louisville CO 80027 9560 USA Tel 1 800 345 2755 Canada Datex Ohmeda Canada Inc 1093 Meyerside Drive Unit 2 Mississauga Ontario L5T 1J6 Canada Tel 1 800 268 1472 Tel 1 905 565 8572 Fax 1 905 565 8592 Asia Pacific China Datex Ohmeda Pte Ltd Room B41
99. er and a voltage to current conversion circuit D A Conversion The D A conversion for the flow valve drive circuit is based around the MAXIM MAX530BCWG 12 Bit DAC The output of the DAC is fed to an input of the A D converter multiplexer allowing the microprocessor to monitor the DAC output The MAX530BCWG is a 12 Bit D A converter operates from a single 5 Volt power supply The output range of the converter is 0 to 4 095 Volts 1mV per LSB The MAX530BCWG has the following dc accuracy specifications Integral Nonlinearity 1 LSB max Differential Nonlinearity 1 LSB max guaranteed monotonic Full Scale Error 1 LSB max Zero Scale Error 4 LSB max Flow Valve Drive Circuit The Flow Valve Drive Circuit supplies flow valve current based on a given DAC in put voltage setting With a O to 4 000 Volts input the drive circuit outputs O to 1 0 Amps typical into a 3 ohm load This circuit does not require adjustment and is ac curate within 2 of full scale This circuit also limits the flow valve output to less than 10VA under normal oper ation and under a single fault condition This is a requirement of the international regulation IEC 601 2 13 A signal representative of actual drive current is input to the A D converter to allow the processor to monitor the current and detect faulty conditions 1503 0151 000 3 27 97 2 21 2 Theory of Operation 2 22 Gas Inlet Valve Drive Circuit This circuit consists of a LM2952
100. except the knob 2 Knob 1503 3030 000 Figure 7 8 Encoder rotary 16 position with push button switch 1503 0151 000 3 27 97 7 5 7 Mlustrated Parts List 7 6 1 2 3 4 5 6 7 8 9 oar aN Mounting shelf locating pins for anesthesia system 1503 5013 000 Power cord fuse block 1503 3020 000 See figure 7 11 Power cord receptacle see Figure 7 11 Power cord bracket 1503 3070 000 Bracket mounting screws 0140 6226 118 2 lockwashers 9213 0540 003 2 Threaded hole for shipping screw Locking knob 1301 3018 000 Deflector tube for free breathing valve 1503 3110 000 Power cord not shown ANSI 1503 3078 000 IEC 1503 3079 000 REV IEC 1503 3080 000 Figure 7 9 Chassis bottom view 1503 0151 000 3 27 97 7 illustrated Parts List 1 2 2a 2b 3 Keps nut M4 0144 3717 314 3 Ground harness 1500 7048 000 Keps nut not shown 0144 3717 314 2 Washer M4 not shown 9213 0540 003 2 Label set 1503 3027 000 Figure 7 10 Power module mounting 2a 2b Connector AC inlet 1503 3000 000 Fuse 2 amp 250V 5x20 mm delayed time not shown 1503 3073 000 2 Filter harness 1500 7053 000 Keps nut M4 not shown 0144 3717 314 Washer M4 not shown 9213 0540 003 Transformer assembly 1503 3017 000 see Figure 7 13 Bracket power module 1503 3060 000 Figure 7 11 Power module components 1503 0151 000 3 27 97 7 7 7 Mlustrated Parts List 1 Speaker 1503
101. g for leak match VT greater than V delivered age Refer to Pressure Sensitivity Bain or Circle CAL Fail in Section 4 2 Check the flow sensor 3 Replace the flow sensor 1 No Insp Flow Sensor 1 No inspiratory flow sensor 1 Examine check valves free connected breathing valve and MOBO 2 No Exp Flow Sensor 2 No expiratory flow sensor con 2 Check flow sensor locations 3 Inspiratory Reverse nected and tubing connections Flow 3 Negative flow on inspiratory 3 Check breathing circuit configu 4 Expiratory Reverse Flow flow sensor during inspiration ration 5 Check Flow Sensors 4 Negative flow on expiratory flow sensor 5 Incorrect connection 0 flow on Insp sensor during inspiration or 0 flow on Exp sensor in expira tion after seeing flow in inspira tion O calibration error Os not equal to set O f 1 Calibrate O sensor O greater than 110 On Battery Status line indicates on battery 1 Is AC LED off or battery current test greater 2 Check system power cord and than 300 mA fuses 3 Check AC wall power if o k replace battery replace CPU Be aware of a 30 min max of batt operation Sans Gas Frais Patient breathing in DCGO Operator has attempted to turn on the ventilator with the dual com mon gas outlet in the auxiliary position A D Converter Failure ADC time out monitoring is not Reboot ventilator if problem con functioning or it is unreliable tinues replace CPU board Minimum System Shut
102. ge 14 Remove the alignment tool and install the high pressure no pilot weight 1503 0151 000 5 26 0 6 Repair Procedures 15 Install the MOBO housing cover 16 Reinstall the bellows and ABA pop off valve the ABA housing and remove all occlusions MOBO installation alignment tool Cover mounting screws 4x8 mm Top cover no pilot weight cylinder No pilot weight cylinder Captive MOBO assembly mounting screws MOBO assembly body Port for no pilot weight Port with O ring Port for pilot weight diaphragm 0 7900 main manifold 2 PN OOS ONS Figure 6 31 MOBO alignment and installation 1503 0151 000 5 26 0 6 37 6 Repair Procedures Mechanically cycle MOBO weights See figure 6 30 1 Check to ensure smooth operation of the MOBO weights by lifting them mechan ically Remove the exhalation manifold to gain access Use a blunt object to push the weights up and then allow them to drop back down See figure 6 32 Regulated pressure check port Free breathing valve Supply gas filter bowl Access to MOBO weight no pilot Access to MOBO weight pilot OP ons Figure 6 32 Main manifold bottom view exhalation manifold removed CAUTION Do not use an object that has a sharp or pointed end to lift the weights The seals may be damaged 6 38 1503 0151 000 5 26 0 6 Repair Procedures Removing the Drive gas check valve assembly Captive mounting screws O ring Alignm
103. icrocontroller board Whenever you replace the microcontroller board and or the EPROM s U30 and U40 or perform the software upgrade perform the following tests in the ventilator service mode Select the drive gas Select the altitude Cal O2 Sensor Cal Flow Sensor Cal Pressure Sensitivity Cal Flow Valve Cal Bleed Resistor Perform the Post Service Checkout of the ventilator and Anesthesia system 6 18 1503 0151 000 5 26 0 6 Repair Procedures Removing the front panel 1 Disconnect the ribbon cable J2 from the front panel 2 Use the 2 5 mm hex wrench to remove the two chassis mounting screws Tube lt e b Figure 6 14 Front panel removal 3 Lift the front panel up to clear mounting pins and remove it from the chassis Replacing the display board 1 Disconnect the ground wire from the front panel board using the 7 mm nut driver Figure 6 15 Disconnect cable 2 Disconnect ribbon cable between display board and keyboard board Squeeze locking tabs to release connectors 1503 0151 000 5 26 0 6 19 6 Repair Procedures 3 Set the cable aside for reassembly Figure 6 16 Remove display board 4 Use 5 5 mm nut driver to remove the four hex head mounting nuts 5 Lift out the display board 6 When installing check for debris and or finger prints on the panel face Clean with isopropyl alcohol as necessary 6 20 1503 0151 000 5 26 0 6 Repair Procedures Replacing the en
104. imit switch Exit service mode Figure 4 1 Service mode main menu 1503 0151 000 5 26 0 4 3 4 Tests and Troubleshooting 4 3 Diagnostic Tests Note For simplicity the following text uses the term control wheel for the knob used to select and confirm settings This knob and the rotary encoder switch attached are also referred to as The Encoder Test CPU The software tests the CPU integer instructions as well as the CPU register s If this test fails the CPU did not perform an integer instruction correctly or the CPU register s have failed Upon FAIL replace the microcontroller board See section 6 Test CPU Directions for testing 1 Select Start Test to perform the test Current test status Start Test Go To Main Menu 4 4 1503 0151 000 5 26 0 4 Tests and Troubleshooting Test External RAM The software tests all of the external RAM memory with a walking bit pattern test It writes a certain bit pattern to a block of memory and then reads that block of memory If the bit pattern that it wrote is not the same bit pattern that it reads back the test fails Upon FAIL replace the microcontroller board See section 6 Test External RAM Directions for testing 1 Select Start Test to perform the test Current test status Testing Go To Main Menu Test Display RAM The software tests all of the display RAM memory via a walking bit pattern test It writes a certain bit pattern to a block of
105. ing and releasing gas machine O flush valve e DCGO switch status French machines only either Vent or Aux O Supply Pressure Status Pressure indicates there is O supply pressure 15V Fail Status indicates analog positive voltage supplies are within range 15V Fail Status indicates analog negative voltage supplies are within range 1503 0151 000 5 26 0 4 Tests and Troubleshooting Display Battery Charge Status The software displays the battery charge status This checks to see if the battery charge is greater than or equal to 12 5 volts If it is less than 12 5 volts the battery charge status displays that the battery is not charged If it is greater than or equal to 12 5 volts the battery charge status displays that the battery is charged Battery Charge Status Battery Charged greater than 12 5 volts Battery Charge Status Battery Charge Status Battery charged greater than 12 5 volts Go To Main Menu Remarks If the battery has been on charge for several hours and you get a battery is not charged display Check the battery in line cable fuse If the fuse is good the battery is bad replace it 1503 0151 000 5 26 0 4 17 4 Tests and Troubleshooting System Error Log The software displays the most current 10 errors that have been logged The error code address and software revision are important pieces of information if technical support is required System Error Log Boo
106. intenance service or repair Failure to do so may result in patient injury The 7900 Ventilator has a self test built into its software This test determines that the software is functioning properly and that the electronic circuits on the circuit boards are functional The following list of the tests run at power up Sequential watchdog Logical watchdog Data RAM walking pattern test FLASH ROM CRC verification Gas inlet valve test electrical and pneumatic Calibration of the manifold sensor If the gas inlet valve causes the self test to fail on power up an alarm occurs and is displayed appropriately Gas Inlet Valve Circuit Failure Also an error code 1002C will register on the error code service mode menu 1503 0151 000 5 26 0 4 1 4 Tests and Troubleshooting 4 2 If the calibration of the manifold sensor fails on power up an alarm occurs and is displayed appropriately Manifold Pressure Sensor Failure An error code 1003E will also register on the error code service mode menu If one or more of these tests fail the display provides a readout which tells the op erator to contact an Ohmeda Service Representative These tests are run continuously during normal operation and alarms are associ ated with each test A failure causes an alarm to display on the screen in the alarm display area See section 4 7 of this chapter and the Appendix in the O amp M Manual Flow valve electrical feedback e G
107. ion and low pressure operation check 1 Remove the bellows and the pop off valve from the ABA and reinstall the ABA housing 2 Connect the ventilator to the anesthesia machine for normal operation with the APL switch set to VENT 3 Occlude the Y piece of the patient breathing circuit 4 Place the diaphragm and pilot weight onto the manifold Note When replacing the diaphragm also replace the pilot weight included in the elastomer kit 5 Setthe valve housing into the recessed area on the main manifold 6 Align the side of the housing along the back edge of the manifold so it is parallel and equal spaced 7 Remove the MOBO top cover mounting screws with a 2 5 mm hex wrench and remove the cover 8 Inset the alignment tool item 1 figure 6 31 into the hole item 4 figure 6 31 exposed when the top cover was removed in step 2 9 Use a 3 mm hex wrench and gently start the threads of the captive mounting screws See item 5 figure 6 31 Tighten just enough to hold the assembly but loose enough so the assembly housing may be moved about on the manifold 10 Set fresh gas flow to 3 L min 11 Occlude the waste gas scavenging port on the exhalation manifold 12 Observe the circuit pressure gauge on the absorber Swivel the MOBO hous ing around the alignment tool until the pressure reads 20 to 40 cm H20 13 Tighten the captive housing mounting screws and verify that the circuit pres sure remains within the allowable ran
108. isolation transformer 6 24 Removing the power module 6 24 Prepare power module for removal 6 25 Isolation transformer removal 6 26 Alarm speaker removal 6 27 Power cord inletremoval 6 28 6 7 Pneumatic subassembly removal 6 29 Removing the non relieving regulator 6 29 Removing the flow control valve 6 30 Removing the solenoid and gas inlet valve assembly 6 32 Removing the GIV assembly 6 32 Removing the solenoid switch 6 32 6 8 Gas Inlet Valve Repair r r a 6 33 Removing the Mechanical Over pressure Bleed Off valve MOBO assembly u irren mot ceo atan a Go a ad a Suay de usaq patuta gd Vita 6 35 MOBO removal See figure 6 30 6 36 MOBO installation and low pressure operation check 6 36 1503 0151 000 3 27 97 iii Table of Contents Mechanically cycle MOBO weights See figure 6 30 6 38 Removing the Drive gas check valve assembly 6 39 Removing the pressure sensing switch assembly 6 40 6 9 SIB Removal from Excel Modulus SE
109. it boards and the power module each of the pneumatic subassemblies can be removed without having to remove other components Note The subassemblies for removal are shown with other subassemblies re moved in some cases Removing the non relieving regulator The regulator is replaced as an assembly 1 Phillips head screws 4 DO NOT REMOVE 2 Captive regulator mounting screws 2 Figure 6 24 Regulator removal 1 The regulator is replaced as an assembly Do Not remove the Phillips head screws 4 that hold the regulator together Use the 3 mm hex wrench to loosen the two 2 captive mounting screws Lift out the regulator Inspect seat and O rings for damage Replace as necessary before replacing the regulator 1503 0151 000 5 26 0 6 29 6 Repair Procedures Removing the flow control valve 1 Disconnect the cable connector J7 from microcontroller board Figure 6 25 Disconnect the flow control valve cable 2 Use the 3 mm hex wrench to loosen the two 2 captive mounting screws and lift out the flow control valve See figure 6 26 3 Examine the seat and two O rings for damage replace as necessary 6 30 1503 0151 000 5 26 0 6 Repair Procedures 1 Flow control valve cable connector to J7 microcontroller board 2 Captive mounting screws 2 Figure 6 26 Flow control valve removal 1503 0151 000 5 26 0 6 31 6 Repair Procedures 6 32 Removing the solenoid and gas inlet valve assembly So
110. l Pinspired Conditions or combination of set tings may prevent ventilator from achieving settings Refer to Pressure Sensitivity CAL Fail listed in Section 4 Pmin PEEP is not within a spe 1 Check tubing connections cific window Rate and or I E Ratio may prevent ventilator from reaching desired PEEP level Heliox Mode selected Select only if using HeO gas mix ture VT less than VT threshold Preset tidal volume not achieved Operator may still influence tidal volume with settings Refer to Pressure Sensitivity CAL Fail listed in Section 4 Manifold pressure greater than 1 Check fresh gas flow airway pressure plus threshold 2 Check and restore breathing circuit volume breath cannot be delivered until bellows volume is restored O less than threshold 896 O 1 Calibrate O sensor 2 Replace Os sensor Use of auxiliary circuit in DCGO 1 Check dual common gas outlet 2 Check that auxiliary circuit is in use 5 26 0 4 Tests and Troubleshooting Alarm Condition Probable Cause Service Action Message Symptom Inspiratory flow sensor EEPROM cal data read failure Remove flow sensor from breath Fail using default cal data ing circuit Disconnect from patient interface panel and reconnect sensor If error message goes away sensor OK If error message reappears replace bad flow sensor Expiratory flow sensor Fail Insp VT VTE volume Mis VTE greater than VTI Circle or 1 Check system tubin
111. lator has a pneumatic section and an electronic section They are separated by a barrier with a gasket to keep pneumatic gasses from leaking over into the electronic section At the end of this section is a page with the heading Notes This page is placed intentionally for your convenience Special Instructions Apply a thin coat of oxygen use approved lubricant to O rings prior to installation unless otherwise noted Use KRYTOX GPL 205 Ohmeda Stock Number 1001 3854 000 Some screws require an anti loosening bond Use Loctite 24231 screw lock Ohmeda Stock Number 0220 5016 300 When replacing fittings position the barb end in the same direction as the original fitting to make hose connections easier Stock Numbers for Replacement Parts Stock Numbers are identified in the Illustrated Parts List following 7 2 7900 SERVICE KITS See section 09 Appendix for further detail and other parts not shown in this section Description Part number Stand Assembly Service 1503 8005 000 Kit IC Programmed U30 and U40 Rev 2 4 1503 8015 000 Kit PC Assembly Microcontroller Svc 1503 8007 000 Kit PC Assembly Power Supply Svc 1503 8008 000 Kit PC Assembly SIB Svc 1503 8009 000 Includes calibrated SIB assembly Kit EL Display 1503 8010 000 Kit Manifold Main Svc 1503 801 1 000 Kit Valve Flow Control Svc 1503 8013 000 Kit Latch assembly Service 7900 Vent 1503 8014 000 Kit Cable Software Upgrade Service 7900 Vent 1503 8019 000 1
112. le you ll need a pen light and small flat blade screwdriver a Remove the retaining ring and valve cap as in step 1 b Push the shuttle fully into the housing with your finger and use the 1503 0151 000 5 26 0 6 33 6 Repair Procedures pen light to look into the gas inlet port See cross section view item 6 You should see a shoulder of the shuttle CAUTION A Do not push hard against the shoulder Do not use an object that has a sharp or pointed end to lift the shuttle The sealing area of the shuttle may be damaged c Insert the screwdriver into the inlet port and very gently lift the shuttle toward the opening While looking at the top opening of the valve you will see the top of the shuttle move up d Look into the port again and you will see another shoulder Re peat step c but be very careful A slight scratch or nick on this area of the shuttle will cause an unacceptable leak e Use your fingers to remove the shuttle for U cup and lower O ring replacement 9 mai ee U cup seal upper Shuttle Apply KRYTOX U cup seal lower 4 Pens Figure 6 29 Detail shuttle and U cup seals 3 Replace the second O ring and second U cup seal Lubricate the O ring and seal with KRYTOX Reinstall the shuttle Replace and lubricate the first O ring as you install the inlet valve cap Install the retaining ring flat side out away from the block 6 34 1503 0151 000 5 26 0 6 Repair Procedures Rem
113. lenoid socket head mounting screws 1 5 mm hex wrench Cable connector to J6 microcontroller board Captive mounting screws Cable connector from pressure switch 1 2 3 4 Figure 6 27 Inlet valve and solenoid switch removal 1 Disconnect the cable connector J6 from the solenoid switch on the microcon troller board Removing the GIV assembly 2 Use the 3 mm hex wrench to loosen the two 2 captive inlet valve mounting screws 3 Lift the inlet valve solenoid switch assembly out of the ventilator chassis Examine the seat and O rings in the manifold for damage Replace as neces sary Removing the solenoid switch Use a 1 5 mm hex wrench to remove the mounting screws from the solenoid switch on the inlet valve 1503 0151 000 5 26 0 6 Repair Procedures 6 8 Gas Inlet Valve Repair 1 Retaining ring 2 Valve cap 3 O ring 4 Shuttle with upper U cup 5 Lower U cup 6 O ring 7 Inlet valve housing 8 Captive mounting screw 9 Gasinlet port 1 lt 0 Captive mounting screw lt 2 Cross section view 1 Retaining ring 2 U cup seal upper 3 Valve housing 4 Shuttle body 5 U cup seal lower 6 Inlet port access to remove shut tle 7 O ring lower 8 O ring upper 9 Valve cap Figure 6 28 Gas inlet valve exploded view Remove the retaining ring and valve cap 2 Remove the shuttle and replace the first O ring and U cup seal Lubricate the seal with KRYTOX M To remove the shutt
114. lts 1mV LSB Number of Channels 16 Total Conversion Time 20u sec max Integral Nonlinearity 1 LSB max Differential Nonlinearity 1 LSB max guaranteed monotonic Full Scale Error 6 LSB max Unipolar Offset Error 3 LSB max The DAC system is designed to meet the following specifications Resolution 12 Bits Number of Channels 1 Settling time to 0 0196 30u sec max Output Voltage Range 0 4 095 Volts 1mV LSB Integral Nonlinearity t1LSB max Differential Nonlinearity 1 LSB max guaranteed monotonic Full Scale Error 9 LSB max e Zero Scale Error 4 LSB max Analog to Digital Converter System The ADC system is based around the MAXIM MAX 191BCWG a 12 Bit A D con verter It operates from 15 Volt power supplies except for the A D converter The MAX191 is powered by a 5V supply and protected from over voltage The con verter has an internal 4 096 Volt reference which results in a 1mV Bit resolution A 16 channel multiplexer and buffer amplifier precedes the A D converter The manifold pressure patient pressure inspiratory flow and expiratory flow signal in puts to the multiplexer are filtered with an antialiasing filter Other inputs are filtered by low pass filters 1503 0151 000 3 27 97 2 19 2 Theory of Operation Signals that are monitored by the ADC system include Flow DAC output Flow Current sense Inlet Valve Current sense Patient Pressure Manifold Pressure Inspiratory Flow
115. memory and then reads that block of mem ory If the bit pattern that was written is not the same bit pattern that it reads back the test fails Upon FAIL replace the microcontroller board Test Display RAM Directions for testing 1 Select Start Test to perform the test Current test status Start Test Go To Main Menu 1503 0151 000 5 26 0 4 5 4 Tests and Troubleshooting Test Flash ROM The software tests the Flash ROM via a CRC check Cyclic Redundancy Check A CRC value has been calculated for the Flash ROM memory and this value is stored in the Flash ROM This test recalculates the CRC for the Flash ROM and compares it to the value stored in Flash ROM If the value that was calculated does not equal the value that was stored in Flash ROM the test will fail Upon FAIL replace the microcontroller board software a new Flash ROM chip see section 6 Test Flash ROM Directions for testing 1 Select Start Test to perform the test Current test status Start Test Go To Main Menu 4 6 1503 0151 000 5 26 0 4 Tests and Troubleshooting Test EEPROM The software tests all of the EEPROM memory via a bit pattern test It writes a cer tain pattern to a block of memory and then reads that block of memory If the bit pattern that was written is not the same as the bit pattern read back the test fails Upon FAIL replace the microcontroller board Test EEPROM Directions for testing 1 Select Start Test t
116. mounting tray to set the ventilator on the service shelf Remove the three mounting screws from the tray 10 See service shelf setup Threaded nut for thumb screw lock bolt one on each side of tray Threaded nut for shipping screw Locating pins to center and locate the ventilator properly Clearance holes for tray mounting to ventilator chassis AO N Figure 6 5 Ventilator mounting tray 6 6 1503 0151 000 5 26 0 6 Repair Procedures 6 3 Setting up the Service Shelf The service shelf folds for easy storage When setting up ensure the four locking screws are secure CAUTION A The circuit boards are electrostatic sensitive Set the 7900 service shelf on an anti static work station and wear a wrist grounding strap while working on the boards Notch for locking screw on the ventilator 2 Spare locking knob Locking knobs 4 Hold the service shelf in position when unfolded to hold the ventilator while servicing Figure 6 6 Setting up the service shelf 1 Ensure the service shelf is setup on the anesthesia machine s work surface CAUTION A The ventilator weighs approximately 40 pounds Use care in its removal 1503 0151 000 5 26 0 6 7 6 Repair Procedures 2 3 CAUTION 6 8 I I I M Figure 6 7 Put the ventilator on the service shelf Arrange the ventilator so the rear is toward the left side of the gas machine Set the ventilator down on the ser
117. ncluded 1503 3029 000 Test plug 0213 4728 300 O2 deflector shield 1503 3109 000 Figure 7 21 Exhalation manifold latch assembly 1503 0151 000 3 27 97 7 13 7 Mlustrated Parts List 7 14 O ring Filter element Filter bowl Service Kits O rings and filter element 1500 3320 000 Replacement kit complete filter assembly 1500 3319 000 Figure 7 22 Supply gas filter assembly see O amp M Manual Bop Valve flapper 0211 1454 100 O ring 1503 3034 000 Check valve seat 0207 5590 100 Tube oxygen deflector 1503 3110 000 Pens Figure 7 23 Free breathing valve 1503 0151 000 3 27 97 7 illustrated Parts List 1 Diaphragm assembly 1503 3000 000 Exhalation valve assembly 1503 3001 000 Exhalation valve kit not shown includes 2 diaphragms 2 o rings gasket and manifold assembly 1503 8004 000 Figure 7 24 Exhalation manifold valve see O amp M Manual Figure 7 25 SIB Sensor interface board assembly 1503 8009 000 1503 0151 000 3 27 97 7 15 7 Mlustrated Parts List 7 16 Figure 7 26 Patient interface board assembly 1503 3081 000 includes harness interface panel and tubing SIB Harnesses SIB Machine interface harness 1503 3082 000 connects O flush system ON Standby and DCGO on French machines SIB 7900 Ventilator cable 1503 3075 000 connects between the SIB and Venti lator Serial interface cable 7900 RGM 1503 3076 000 Serial Interface cable 1503 3077
118. nd accessories included with the anesthesia system 1503 0151 000 5 26 0 3 1 3 Post Service Checkout Notes 3 2 1503 0151 000 5 26 0 4 Tests and Troubleshooting 4 1 Overview WARNING Do not perform testing or maintenance on medical instruments while they are being used on a patient patient injury may result This section includes pass and fail tests with calibration procedures for 7900 Ven tilator control module Operator calibration information is covered in the 7900 Ven tilator O amp M manual Testing Requirements The 7900 Ventilator an integral part of the Ohmeda Anesthesia System can be tested while the control module is mounted in the anesthesia machine From the test results you must determine if it is necessary to remove the control module to gain access for service and or maintenance The ventilator must be removed from the anesthesia system and placed on a spe cial service shelf in order to gain access for service maintenance and parts re placement This service shelf allows you to set the ventilator on the work surface of the anesthesia system and reconnect hoses and cables If you are performing routine maintenance it is necessary to complete the entire section It is always necessary to perform section S Post Service Checkout after this section WARNING Post Service Checkout is required after you complete this section You must perform section 3 Post Service Checkout after performing any ma
119. ne 6 2 Removing the 7900 ventilator from the integrated machine 6 2 Removing the 7900 ventilator from the non integrated machine 6 4 6 3 Setting up the Service Shelf _ 1 6 7 6 4 Removing the top cover 2 oo casei enki ere RE M Rem RE Ed es 6 9 6 5 Printed circuit board and power module removal 6 11 Removing the Power Supply circuit board and the Microcontroller circuit ri ic tartan oa tiie Wore aroth oa saps denne ate aa Be Hoke ele MRS ee k 6 11 Removing Power Supply circuit board 6 11 Removing Microcontroller circuit board 6 14 Firmware Replacement Procedure 6 16 Software Upload Procedure 6 17 Ohmeda Software Upgrade Tool 6 17 To Install Ohmeda Software Upgrade Tool 6 17 To Install 7900 Software Field Upgrade 6 18 To Perform Software Upgrade 6 18 Microcontroller board 6 18 Removing the front panel osos as tae aed eet es ext Sek Lanes dae were 6 19 Replacing the display board 6 19 Replacing the encoder switch 6 21 Removing the battery 6 22 Testing After Maintenance 6 23 6 6 Replacing the
120. nsert the 7900 field upgrade installation diskette in drive A From the File menu of the Program Manager or File Manager choose Run Type a setup Follow the Setup instructions on the screen Run the virus scanning software to confirm no known viruses exist on the computer To perform software upgrade 1 2 Turn off power to the 7900 ventilator Double click on the Ohmeda Upgrade Tool icon located in the Ohmeda Sup port Tools program group From the Setup menu of the Ohmeda Upgrade Tool choose release Double click on the file corresponding to the new release for example 7900 2 2 rls is 7900 software revision 2 2 Verify Comm Port is correct There are two choices Step by Step or Quick Upgrade Choose Step by Step and follow the instructions on the screen Confirm the serial port used by the PC and the software version being loaded If these are incorrect choose Can cel and use the Setup menu to change these settings Continue to follow instructions on the screen until the upgrade procedure is com plete Once you are familiar with the upgrade procedure the Quick Upgrade but ton allows you to perform the upgrade without the step by step instructions You should follow the step by step process at least once for each software release since the procedures may change from one release to the next When you have finished with the upgrade perform the tests listed below for replac ing the microcontroller board and or EPROMs M
121. o perform the test Current test status Start Test Go To Main Menu 1503 0151 000 5 26 0 4 7 4 Tests and Troubleshooting 4 8 Test Panel Switches The software will set up the ventilator to receive all button presses and control wheel turns The test asks the user to press each of the buttons and turn the con trol wheel one full turn in both directions Each time a button is pressed the number next to the button is reverse highlighted If the button is pressed and the number next to the button does not reverse highlight the test for that button failed If all of the buttons are pressed and all of the numbers next to the buttons are reverse highlighted the button press test passes The control wheel turn test works the same way The user is prompted to turn the control wheel clockwise and counter clockwise one full turn 16 clicks When the control wheel is turned one full turn in either direction and the control wheel is working the test passes If the control wheel is not working the test times out in about 10 seconds and the test fails Test Front Panel Test Front Panel Directions Follow the directions listed below If the correct button or knob is not pressed turned within 20 seconds the test will fail Notice that each button knob has a number displayed next to it Press each button knob from 1 10 Turn the encoder knob one complete turn clockwise Turn the encoder knob one complete turn counter clockwise Start
122. o pressure offset voltage It does so by read ing the A D for inspiratory flow expiratory flow airway pressure and manifold pres sure when the flow sensors have been disconnected from the patient interface panel If the A D values are not within the correct tolerance the calibration fails If the calibration passes the A D values at which the inspiratory flow expiratory flow airway pressure and manifold pressure transducers were calibrated at are stored in the EEPROM Calibrate Flow Sensors Directions for calibration 1 Disconnect flow sensors from patient interface panel 2 Select Start Cal to start the calibration 3 Reconnect flow sensors upon completion of calibration Manifold sensor failed Current calibration status Fail StatCal Go To Main Menu Remarks Fail indicates a problem with the microcontroller board check for bad differential pressure transducer Check the transducer outputs using the Display A D menu If the transducer is not zeroing remove the exhalation valve from the manifold If the transducer zeros replace the flow valve If not replace the microcontroller board 1503 0151 000 5 26 0 4 25 4 Tests and Troubleshooting Calibrate Flow Sensors Directions for calibration 1 Disconnect flow sensors from patient interface panel 2 Select Start Cal to start the calibration 3 Reconnect flow sensors upon completion of calibration Patient airway pressure sensor failed Current calibra
123. ock Number aut This way up SN Serial Number 1503 0151 000 5 26 0 1 3 1 Introduction Plus positive polar Systems with this mark agree with Euro ity C pean Council Directive 93 42 EEC for XXXX medical devices when they are used as specified in their Operation and Mainte nance Manuals The xxxx is the certifica tion number of the Notified Body used by Ohmeda s Quality Systems Minus negative gt lt Read top of float m polarity y O Lamp lighting illu x mination 1 4 1503 0151 000 5 26 0 1 Introduction 1 3 Standard Service Procedures Operation and Service Manuals You must have and be familiar with the Operation and Maintenance manuals for this product Study the Anesthesia Systems Operation and Maintenance manuals if you need further information about the operation of the system You must deter mine where a problem is located before you can determine which service manual to use Refer to the various service manuals or accessory manuals if you require more information Service calibration functions allow Ohmeda trained users and Ohmeda service per sonnel to perform ventilator setup functions tests calibration and measurements from the front panel display or from commands sent to the proprietary serial port Ventilator Tests Normal operational tests can be performed while the Ventilator is installed in or at tached to an Anesthesia System Calibration troubleshooting or repair may r
124. og monitoring of supply voltages internal control voltages feedback signals from the flow and inlet valves and battery voltage Automatic switch over to battery operation in the event of an inter ruption in ac power Use of the software watchdog timer in the 68340 processor for tem poral monitoring with direct de energizing of the flow and inlet valves in the event of a non recoverable error Use of an operating mode watchdog for logical and temporal moni toring with direct de energizing of the flow and inlet valves in the event of a non recoverable error Monitoring of the system clock to detect an operating frequency out of an acceptable range Use of a redundant high pressure limit safety switch in the bellows drive circuit which directly de energizes the flow valve 1503 0151 000 3 27 97 2 17 2 Theory of Operation Watchdog Systems 68040 Software Watchdog Timer The watchdog timer in the 68340 processor activates for a time period appropriate for the application If it times out due to a software execution fault e g software trapped in an infinite loop a level 7 interrupt non maskable is internally issued so that the exception handler software can attempt to correct the error transparently Operating Mode Watchdog This watchdog detects errant program execution using an address matching tech nique as well as providing a time out function The time base for the temporal mon itoring is independent from the s
125. oval 6 26 Alarm speaker removal 6 27 Power cord inlet connector removal 6 28 Regulator removal 5 re prtL bre E eso D han ee ngewe Bese 6 29 Disconnect the flow control valve cable 6 30 Flow control valve removal 6 31 Inlet valve and solenoid switch removal 6 32 Gas inlet valve exploded view 6 33 Detail shuttle and U cup seals 6 34 Mechanical Over pressure Bleed Off valve MOBO removal 6 35 MOBO alignment and installation 6 37 Main manifold bottom view exhalation manifold removed 6 38 Drive gas check valve removal 6 39 Pressure sensing switch removal 6 40 SIB cable and pneumatic hose identification 6 41 Patient Interface panel cable and pneumatic hose identification Replace as an assembly Shown as an exploded view for tube cable routing clarification _ 6 42 1503 0151 000 3 27 97 List of Illustrations Section 7 Figure 7 1 Figure 7 2 Figure 7 3 Figure 7 4 Figure 7 5 Figure 7 6 Figure 7 7 Figure 7 8 Figure 7 9 Figure 7 10 Figure 7 11 Figure 7 12 Figure 7 13 Figure 7 14 Figure 7 15 Figure 7 16 Figure 7 17 Figure 7 18 Figure 7 19 Figure 7 20 Figu
126. over current limiting and thermal shutdown protection The 15V and 5RS VAUX outputs are 10VA limited and go through 10VA limit circuitry before be ing sent to the SIB board and the pneumatic isolation area Voltage Rails Specifications Outputs Digital logic 5 Vdc 3 68595 to 3 05 5W Max 415V 15 Vdc 415 75 Vdc to 14 25 Vdc 2W Max e 15V 15 Vdc 15 75 Vdc to 14 25 Vdc 2W Max EL Display 10 to 15 Vdc 10W Max VAUX 5 8 Vdc 6 09 Vdc to 4 99 Vdc 7 7W Max Ripples 5VCC lt 50 mVp p 5 5 Vdc lt 100 mVp p 12 Vdc lt 200 mVp p 15V lt 100 mVp p 1503 0151 000 3 27 97 2 13 2 Theory of Operation 2 14 External Interface The external interface of the ventilator is an important design task from the stand point of Electromagnetic compatibility EMC It is important to protect the ventila tor from conducted and radiated Electromagnetic Interference EMI and from Electrostatic Discharge ESD In addition EMI design precautions are taken to control the emission of EMI via cabling and access ports Communication Interface RS232C There are two RS232C interfaces Both operate with a maximum baud rate of 38 4K baud The isolated interfaces eliminate the possibility of ground loops External Interface Connector This section of the design covers the various inputs and outputs that pass though this connector Each input or output is protected from EMI and ESD in an appro priate manner Sealed Lead
127. oving the Mechanical Over pressure Bleed Off valve MOBO assembly 9 ON Oe ONS Cover screws M4 x 8 button head No pilot weight cover Captive MOBO mounting screws Threaded for cover screws Cylinder hole for alignment tool and no pilot weight No pilot weight and pressure seal Port with O ring Pressure seal for no pilot weight Diaphragm for pilot weight 10 No pilot weight 11 Pilot weight Figure 6 30 Mechanical Over pressure Bleed Off valve MOBO removal 1503 0151 000 5 26 0 6 35 6 Repair Procedures 6 36 MOBO removal See figure 6 30 1 Use the 3 mm hex wrench to loosen the two 2 captive mounting screws hold ing the MOBO bogy item 2 to the pneumatic manifold 2 Lift off the MOBO housing from the manifold Weights will remain on the man ifold 3 Lift the pilot weight item 11 and the diaphragm item 9 off the manifold Dis card the pilot weight if it does not match the weight in the elastomers kit 4 Lift off the no pilot weight assembly items 8 and 10 5 Inspect the pressure seal of the no pilot weight and the diaphragm item 9 Re place as necessary If replacing the diaphragm ensure that you install the pilot weight and diaphragm in the elastomers kit 6 Item 6 of figure 6 30 is a cross sectional view of the no pilot weight showing the proper installation of the pressure seal The seal must be pulled through the weight and the top trimmed below the top surface MOBO installat
128. ps be sides the setup procedure this calibration is completely automated First the soft ware finds the value at which to set the flow valve to get a manifold pressure of 91 92 cmH5O Once it finds this starting point value the automated calibration begins Values shown here are for example only and are not necessarily typical Bleed Resistor Calibration Directions for bleed resistor calibration 1 Select the drive gas using the Select drive gas page 2 Select the altitude using the Select altitude page 3 Perform the Cal flow valve per the directions on that page 4 Occlude the patient circuit at the Y connector 5 Setthe fresh gas flow to 10 Lpm 6 Turn mechanical ventilation on the green LED should be on 7 Set ventilation switch to Ventilator mode 8 Selectthe Start Cal selection and push the rotary encoder switch Bleed Calibration Status Calibrating Go To Main Menu Bleed Resistor Calibration Directions for bleed resistor calibration 1 Selectthe drive gas using the Select drive gas page 2 Selectthe altitude using the Select altitude page 3 Perform the Cal flow valve perthe directions on that page 4 Occlude the patient circuit at the Y connector 5 Setthe fresh gas flow to 10 Lpm 6 Turn mechanical ventilation on the green LED should be on 7 Set ventilation switch to Ventilator mode 8 Select the Start Cal selection and push the rotary encoder switch 51 257 cmH 0 Bleed Calibr
129. r 2176 calibration 1 Select the altitude using the Select altitude page 2 Remove adapter from 02 sensor and expose itto room airfor 3 minutes 3 Select Start 21 Cal to start the calibration 4 Replace adapter on 02 sensor upon completion of calibration Directions for 100 calibration 1 The 100 calibration can only be performed after a valid 21 calibration 2 Expose the sensorto a concentration of 100 02 for 3 minutes 3 Select Start 100 Cal to start the calibration 4 Reconnect sensor upon completion of calibration Start 21 Cal Current calibration status Pass Start 100 Cal Go To Main Menu Remarks See operation and maintenance manual Remove the O2 sensor from the 15 mm adapter ensure that the sensor is in an upright position with the cable connector at the top and expose it to room air for approximately 3 minutes The displayed reading should be 21 2 to pass the calibration requirements Place the sensor that passed the 21 test in the breath ing system and expose it to 100 O2 for 3 minutes If the sensor passes the A D value at which it passed is stored in the EEPROM If it displays readings higher or lower than required to pass the sensor is bad Re place it 1503 0151 000 5 26 0 4 Tests and Troubleshooting Calibrate Flow Sensors See operation and maintenance manual The software calibrates the inspiratory flow expiratory flow airway pressure and manifold pressure transducers for zer
130. r occluded when measuring flow valve output This service tool can be used for directly controlling the output of the flow valve Gas from the 7900 flow valve exits from three separate areas the two drive hoses and the bleed resistor Independent measurements of flow valve output must capture all gas from these ports or provide for their occlusion Be sure to remove all occlusion devices prior to returning the system to service This tool can provide flow for a check of the flow sensor s span but only in an approximate sense Variations between the flow sensor output and the flow valve setting can vary by as much as 2596 Use the Flow Sensor Operational Test as a more accurate measurement of flow sensor competency at lower flows 1503 0151 000 5 26 0 4 23 4 Tests and Troubleshooting 4 5 Calibrations 4 24 Calibrate O Sensor See operation and maintenance manual The software calibrates the O2 sensor at a selected altitude see Select Altitude menu Set the appropriate altitude for the machine location The software in the ventilator calibrates the O2 sensor by reading the A D for the O2 sensor when the O2 sensor is exposed to room air 2196 O2 If this A D value is not within the tol erance the calibration fails If the calibration passes the A D value at which the O2 sensor was calibrated is stored in the EEPROM The sensor must be calibrated at 2196 O2 before calibration at 10096 O2 Calibrate 02 Sensor Directions fo
131. r removal Figure 6 22 Alarm speaker removal 1 The power module must be removed from the chassis to gain access to the alarm speaker mounting nuts This requires the disconnection of the alarm speaker cable from the microcontroller board J1 2 Clip the cable tie with a diagonal wire cutter item 3 fig 6 22 Remove the speaker mounting hex nuts from the studs on the microcontroller board with a 5 mm nut driver 4 Reinstall or replace in reverse order 1503 0151 000 5 26 0 6 27 6 Repair Procedures Power cord inlet removal Figure 6 23 Power cord inlet connector removal 1 Item 1 figure 6 23 is the a c inlet power connector where the two 2 ampere line fuses are located Fuses may be replaced without removal of the inlet con nector 2 Disconnect the white wire quick connect terminal from the inlet connector as sembly to the transformer Rear connection see figure 6 23 item 4 3 Disconnect the ground wire quick connect terminal from the inlet connector as sembly to the ground lug on power module Middle connection 4 Disconnect the black wire quick connect terminal from the inlet connector as sembly to the transformer front connection see figure 6 23 item 3 5 Depress the locking tabs on both sides of the assembly and lift the assembly out of the mounting hole in the power module 6 28 1503 0151 000 5 26 0 6 Repair Procedures 6 7 Pneumatic subassembly removal As with the electronic circu
132. ransducer tubing with color coded connectors and housing 1 2 3 Set the SE System Master Switch to OFF Unplug the system AC power cord from the AC source Disconnect the Inspiratory and Expiratory Flow Transducers from the Interface Panel Disconnect the Oxygen Sensor Harness from the Interface Panel Remove the Tabletop from the Excel SE See Excel SE Service Manual section 5 1 Disconnect the four color coded tubing connectors from the SIB Assembly tub ing Carefully cut and remove cable ties that secure the electrical harness to the pan Disconnect connector J1 form P1 on the SIB Assembly 9 While supporting the Interface Assembly remove the two M4 keps nuts item 10 5 Figure 6 36 using a 7 mm nutdriver Carefully route the harness and tubing through the pan to remove the assembly 1503 0151 000 5 26 0 6 43 6 Repair Procedures AA 72214 o Handle sensor interface 1002 3952 000 2 Label patient interface 1001 3464 000 Panel sensor interface 210 1002 3970 000 Screw 10 32 x 3 8 0140 6231 106 4 Nut keps M4 0144 3717 314 2 Harness SA SIB 1503 3081 000 1 2 3 4 5 6 Figure 6 36 Patient interface harness assembly shown mounted on Excel 210 SE left side CAUTION A Do not disconnect the hoses while the SIB is under pressure This may damage the SIB components Ensure the flow transducers are not pres surized by removing the breathing circuit before disconnecting
133. rate the flow valve This is an automated calibration It gradually opens the flow valve and mon itors the manifold pressure When the manifold pressure reaches 1 9 to 2 0 cmH5O the value at which the flow valve has been opened is saved The flow valve is then closed The value at which the flow valve was opened to is then checked to make sure it is within the correct tolerance If it is not the calibration fails If the calibration passes the flow valve calibration point is stored in the EEPROM Flow Valve Calibration Directions for flow valve calibration 1 Selectthe drive gas using the Select drive gas page 2 Selectthe altitude using the Select altitude page 3 Set the fresh gas flow to 10 Lpm 4 Turn mechanical ventilation on the green LED should be on 5 cclude the patient circuit at the Y connector 6 Set ventilation switch to Ventilator mode 7 Select the Start Cal selection and push the rotary encoder switch Current calibration status Calibrating Go To Main Menu Remarks Check that the bag vent selection switch is in the vent position If the flow valve calibration test fails immediately the most likely fault is a bad manifold transducer It can also be a bad regulator or the regulator is out of calibration An other cause could be a bad flow valve 1503 0151 000 5 26 0 4 Tests and Troubleshooting Calibrate Bleed Resistor The software calibrates the bleed resistor using the following procedure ste
134. re 7 21 Figure 7 22 Figure 7 23 Figure 7 24 Figure 7 25 Figure 7 26 Section 8 Figure 8 1 Figure 8 2 Figure 8 3 Figure 8 4 Figure 8 5 Figure 8 6 Figure 8 7 Figure 8 8 Figure 8 9 Figure 8 10 Figure 8 11 Figure 8 12 Figure 8 13 Figure 8 14 Figure 8 15 Figure 8 16 Figure 8 17 Figure 8 18 Figure 8 19 Figure 8 20 Figure 8 21 FOD COVO zeit aah ell BE e e neo Macatee dewalt rs 7 2 Top cover ground wire connections 7 2 Isolation barrier gasket 1503 3018 000 7 3 Front panel assembly mounting and harnesses 7 3 Front panel key board and bezel 7 4 EL display panel mounting 7 4 Front panel display assembly harnesses 7 5 Encoder Rotary 16 position with push button switch 7 5 Chassis bottom VIEW illis v Re E ER e RA RES 7 6 Power module mounting 7 6 Power module components 7 7 Alarmi speaker i me fue Oona ee RoR PRE A OEE E RACE BEL E 7 7 Transformer assembly exploded view 7 8 Battery eee viene Sy oad oye Seed te eps REPRE ied poe ERES ee 7 9 Pneumatic manifold mounting 7 9 Manifold components cxx de wees Ghee dea wes 7 10 Pneumatic manifold O rings 7 10 Gas Inlet valVe uae rede ed xis e G RR XH REN p
135. rive Front Panel Interface Audio Alarm Regulator Output Manifold Pressures Functional Specifications Motorola 68340 Processor Core System Integration Module System Clock An external 32 768 KHz crystal is used with the internal clock synthesizer to gen erate a 24 11 MHz system clock Periodic Interrupt Timer The periodic interrupt timer is the time base for the Real Time Operating System 1503 0151 000 3 27 97 2 15 2 Theory of Operation 2 16 Software Watchdog Timer The software controlled internal watchdog timer guards against program execution going astray External Bus Interface The external bus interface handles the transfer of information between the CPU32 external memory and peripherals Chip Selects The four programmable chip selects access external memory and peripheral cir cuits providing handshaking and timing signals as well as a wait state generation I O Lines Spare I O lines are used for digital control and or sense lines Timer Modules Counter Timer 1 The first counter timer module is used to monitor the 68340 system clock frequen cy The external 3 6864 MHz baud rate clock is the time base for this measure ment Counter Timer 2 The second counter timer module can be used as desired by the application soft ware The time base for this timer is the internal 24 11 MHz system clock Serial Communications Module Timing Reference An external 3 6864 MHz clock oscillator serves as the b
136. s than 11 35V while running on battery 1 Charge battery 2 Measure batt volts 12 5 but 16V If error message doesn t clear replace battery Battery voltage less than 10 9V while running on battery 1 Charge battery 2 If error message doesn t clear replace battery 1 Reboot ventilator if problem continues replace PSB board Battery Voltage gt 16V Battery current 4 amps 2 Replace the CPU board System is unable to run on backup batt 5 26 0 4 43 4 Tests and Troubleshooting Condition Probable Cause Service Action 15V out of range Alarm Message Symptom 15V analog Out of Range Minimum System Shut down 15V SIB Out of Range Minimum System Shut down Manifold pressure sensor failure Minimum system monitor ing Pressure control PEEP disabled Sequential Watchdog Failure Minimum System Shut down Vaux_ref out of range Minimum system shutdown Vext_ref out of range Minimum system shutdown WARNING 1 Reboot ventilator if problem continues measure 15V 75V at J3 pin 1 and pin 2 If out of spec disconnect CPU measure again If within spec continue 2 Replace CPU board 3 Replace the PSB 1 Reboot ventilator if problem continues measure 15V at J3 pin 1 and pin 2 If out of spec 15V out of range 2 Replace PSB board 3 Replace the CPU board 4 Replace SIB Reboot ventilator if problem con tinues replace CPU board Drive pressure limit
137. service person A Caution statement with this symbol cautions the reader of the possi bility of damage to the equipment 1 1 What this manual includes This manual covers the Ohmeda 7900 Anesthesia Ventilator which is an integral component in the Ohmeda Excel SE and Ohmeda Modulus SE Anesthesia Sys tems Data on the control module troubleshooting disassembly repair reassembly test ing and calibration are included The Excel SE and Modulus SE Anesthesia Gas Machines each have their own service manuals 1503 0151 000 5 26 0 1 Introduction 1 2 Symbols The following common symbols are used in Ohmeda manuals and on products however no one product nor manual has every symbol listed Refer to this list con cerning various symbols found On power OFF power Stand by Stand by or prepa ratory state fora part of the equip ment ON only for part of the equipment OFF only for part of the equipment Direct Current Alternating Current Protective earth ground Earth ground Frame or chassis ground Alarm silence but ton Movement in one direction Movement in two directions Lock Unlock Autoclavable non autoclavable Type B equipment Type BF equipment Type CF equipment Warning or Caution ISO 7000 0434 Attention consult accompanying docu ments IEC 601 1 Dangerous voltage O 100 0607 Equipotential Input Variability Output Variability in steps REF St
138. ssure switch tubing from manifold and apply 104 4 cmH20O to activate switch and verify switch status If signal status does not agree with switch status disconnect J8 on microcontroller board and measure resistance to determine function of switch 1503 0151 000 5 26 0 4 Tests and Troubleshooting 4 4 Diagnostic tools Display A D channels The software displays the A D values for each of the A D channels Remarks This selection displays a listing of A D Channels which are at various values depending upon the set parameters One check that can be made is a disconnect check or large leak check 2E4 counts 207 counts 80C counts 81D counts 1 counts 1 counts 2 818 cmH 0 0 014 cmH 0 0 091 L min 0 000 L min 0 000 Amps 0 001 Volts Airway Pressure Manifold Pressure Inspiratory Flow Expiratory Flow Flow Valve Sense Flow DAC Feedback GIV Sense 02 Concentration 1 225 Voltage Ref 5 5 Voltage Test EL Display Voltage 15V 10VA Test 15V SIB Test BAD counts 2B counts ACA counts 971 counts 99A counts TF counts TEE counts CF6 counts 181 278 mA 2 565 1 218 Volts 5 852 Volts 14 402 Volts 14 965 Volts 14 899 Volts 13 315 Volts Battery Voltage Battery Current Ocounts 0 000 Amps Go To Main Menu DESCRIPTION ACTUAL RANGE HEX RANGE DISPLAYED RANGE UNITS SPECIAL INSTRUCTIONS PATIENT PRESSURE 20 to 120 cmH20 0209 02D1 18 235 25 235 cmH20 Zero Offset Reading nominal 621 LSB MANIFOLD
139. sts and Troubleshooting Exit Service Mode Provides the means to exit the service mode via a hardware reset Allows the service person to return to the main operating waveform display and operating menu 1503 0151 000 5 26 0 4 37 4 Tests and Troubleshooting 4 7 Troubleshooting Guides Some ventilator problems may not generate any ventilator messages even though the ventilator may not be functioning correctly Operational alarm messages are found in the Operation and Maintenance manual Actions are numbered in a logical action sequence If action 1 fixes error stop there if action 3 fixes error return actions 1 and 2 to previous status Troubleshooting Mechanical Electrical Probable Cause Action Symptom System on AC LED on no display AC LED not on Alarms display but no audible Bellows does not expand or tends to collapse during venti lation 4 38 1503 0151 000 1 50 position cable membrane to power supply board 2 18 position cable power supply board to CPU board 3 EL display 4 CPU board 5 Power supply board 1 Power cord 2 AC power 3 Power cord fuses 4 50 position cable front panel to microcontroller board 5 Power supply board 6 Membrane switch LED 1 Audio set too low 2 Speaker cable 3 Speaker 4 CPU board 1 Leak in the breathing circuit 2 Bellows not installed properly 3 Tear or leak in bellows 4 Insufficient fresh gas flow 5 Improperl
140. t Start Test to perform the test Current test status Testing Start Test Go To Main Menu Gas Inlet Valve FAIL Instructions Failure can be caused by the valve malfunctioning or the microcontroller board Use a multimeter to measure the resistance of the GIV solenoid It should be ap proximately 25 ohms If necessary replace the GIV solenoid Use a multimeter to measure the voltage at the inlet valve connector which plugs into the microcontroller board The voltage should be 4 5 volts when the GIV is open If the voltage is 4 5 volts or greater rebuild the GIV If the voltage is less than 4 5 volts replace the microcontroller board 1503 0151 000 5 26 0 4 Tests and Troubleshooting Test Pressure Limit Switch The software tests the pressure limit switch to make sure that it trips at the correct manifold over pressure The software opens the flow valve to a value where pres sure continues to increase It then waits for the DPL Drive Pressure Limit switch to trip The pressure at which the DPL switch tripped is indicated This value is cal culated manifold pressure the typical reading is 112 cmH2O not the actual pres sure at the switch If the DPL switch never trips within 15 seconds the test fails If the DPL switch does not trip at a pressure within the correct tolerance the test fails Test Pressure Limit Switch Directions for testing 1 Turn mechanical ventilation on the green LED should be on 2 Setthe fresh g
141. terface cable Coded natural Inspiratory transducer high and airway pressure monitor connect SIB assembly housing 8 System ON Standby switch DARON N Figure 8 4 SIB interface hose and cable routing J oarh O N 7900 Ventilator 1503 0151 000 1 97 8 5 8 Schematics 15V 12V CRA SMBJ16A 0 388 v AT ZERO 2 531 V AT F S 15V 12V 24 deg C zero pressure FL3 OUT 1OV FORGWADI Output 0 621 V do ZJK5103 05 210PCBM Output 4 050 V at full scale 1 2V SENSE E R9 1 4 99K U8 03 O t FEEDBACK AD694BR MJD3055 O 26 2 3 1 8W 2 ALARM PRE T O EL SHI e m ES O MAX667CSA R11 SIGNAL 2s 47 5 C27 C VOS1 VOS2 2VFS COM _L S 0iur O 168 W 1 50v O c9 1 8W O Tea 100PPM D m O oda O 7 R10 O ES 2 2 PAT_RET ABT 1 8W CR3 12v 8 _PRES_PAT C a SH1 E2_POWER SMBJ13A NET CONNECTED TO ANALOG GND 33 PAT RET e m sr O A SH1 X NEAR AD694 PIN 5 O PRES_INSP SH1 2 INSP O 34 INSP_RET HA 9 m aan RE SH2 Q TEES WW PRES_INSP sieh C SH1 36 02 RET Q ais PRES EXP O 12 02 FLUSH SW 5 SH1 2 O 37 SWITCH RETURN 9 O 13 O2_FLUSH DCGO SW 4 PEO a SHl O SWITCH RETURN 8 SH1 12y O 14 DCGO O 39 Dcco O m c22 R22 REM ON SW mig C 0 015UF 2 2 O 16 REM ON SWITCH RETURN e Q 41 REM ON ds F4 O 50V a7 178W O S Q ND CHAS GND 10 11
142. th mid shelf and integrated 7900 ventilator Integrated the ventilator fits in a shroud which has a latching back cover Removing the 7900 ventilator from the integrated machine Remove the rear panel from the gas machine ventilator shroud 1 Push the locking clips on the panel toward the center 2 Allow the panel to hang from its retaining cord CAUTION ZA Do not pull the exhalation valve manifold hoses straight down from the block assembly to remove them Too much force is needed if you pull straight down This added force can cause the hoses to release suddenly and possibly cause damage to the valve block or cause injury to the per son removing the hose To remove the hoses use a careful light twist ing back and forth movement while you apply pressure downward 6 2 1503 0151 000 5 26 0 6 Repair Procedures 3 Remove the dual hose for drive return gas connecting the bellows to the exha lation valve and remove the exhaust hose from the exhalation valve manifold Track on which the ventilator mounts in the Excel Modulus SE Gas Machine Slot into which the locking screw fits for secure mounting Locking screw holds the ventilator in place on the track when tightened Rear panel locking tabs push toward the center to release cover Rear panel of the Excel Modulus SE oreo Figure 6 2 Removing the ventilator from an Excel Modulus SE Anesthesia Gas Machine 4 Unplug the ventilator power cord from the outlet box and threa
143. the breathing system so that any leakage occuring is com pensated for by the ventilator to maintain PEEP An RS 232 serial digital communications port connects to and communicates with external devices 1503 0151 000 3 27 97 2 1 2 Theory of Operation Mechanical 35 100 psi Supply 25 psi Pressure Regulator Manifold Pressure Transducer Bleed Exhaust to Ambient Drive Gas Check Valve DGCV Overpressure Bleed Off MOBO Exhaust to Ambient Exhaust 17 mm port to Scavenging System 25 mm port Figure 2 2 7900 Ventilator Operational Block Diagram Some 7900 Ventilator Features No secondary regulator or exhalation solenoids An exhalation valve that modulates flow in the pressure mode rath er than being just on and off Pressure and volume mode selectable by the operator All pneumatic components are mounted on a single manifold Each component is individually accessible from above or below the manifold There are no threaded connections to the subassemblies Drive gas and bellows pressure relief valve gases are combined and pass through the ventilator exhalation valve Exhalation valve block is autoclavable Scavenging line runs from the ventilator to the Anesthesia Gas Scavenging Receiver AGSR which scavenges both drive gas and gas released by the bellows pressure relief valve Operates in a Closed Loop configuration during both volume and pressure mo
144. the data received The status of the test is displayed on the ventilators front screen Test Serial Ports Internal serial test on the proprietary channel Internal serial test on the public channel Start Test Go To Main Menu Test Serial Ports Internal serial test on the proprietary channel Internal serial test on the public channel Go To Main Menu Serial Port FAIL Instructions The software checks the serial ports to ensure any data sent out is looped back as a direct echo If the returned data is not the same as that sent the ports fails Re place the microcontroller board 1503 0151 000 5 26 0 4 Tests and Troubleshooting Test Flow Valve To test the flow valve the software starts off by closing the flow valve It then opens the flow valve in increments until the flow valve is completely open At each of the settings of the flow valve the A D Analog Digital channel for Flow DAC Digital to Analog Converter Feedback and Flow Current Sense will be read If the A D for the Flow DAC Feedback and Flow Current Sense are not within the correct toler ance the test fails Test Flow Valve Directions for testing 1 Turn mechanical ventilation on the green LED should be on 2 Disconnect the drive gas tubing from the breathing system 3 Select Start Test to perform the test 4 When testing is complete reconnect the drive gas tubing Current test status Testing Start Test Go To Main Menu A failure can
145. thod to access the service mode is by a three key reboot This method can be used when the ventilator is in the normal operating mode Ensure the Me chanical Ventilation switch is off Apnea Detect Off and Volume Monitor Standby modes are selected Press the V Press PEEP and the menu switches at the same time Then push and hold the adjustment knob until the Service Confirma tion menu appears The ventilator enters the service mode without having to pow er down and then back up All data displayed by the ventilator during and after a service mode test or mea surement is also output to the serial port The service mode has a top level main menu screen which displays all the select able service tests in categorical order Diagnostic Tests Tools Calibrations and User settings Any service test can be selected from this menu with the adjustment knob cursor Software version and a date code are at the top of the screen 2 1 Main Menu Service Galibration Mode 101061136 Diagnostic Tests Tools Calibrations User Settings PTT Display AD channels Cal 02 sensor Select altitude Test external RAM Display l0 signals Cal flow sensor Select drive gas Test display RAM Battery charge status Cal press sensitivity Adjust brightness Test FLASH ROM System error log Cal flow valve Select heliox mode Test EEPROM Verity flow Cal bleed resistor Test panel switches Sensor s cal due Test serial ports Test flow valve Test gas inlet valve Test press l
146. tion the ventilator s internal reset repeats until the interference ceases If the electrical interference is continuously present and mechanical ventilation is interrupted for approximately 30 seconds the ventila tor produces a continuous beeping audio alarm Manual ventilation of the patient must be performed while the mechanical ventilation is interrupted When the electrical interference ceases the continuous 1503 0151 000 5 26 0 4 39 4 Tests and Troubleshooting beeping audio alarm can be silenced only by turning the ventilator or anesthesia machine as applicable power switch OFF and after five seconds back ON WARNING A Manual ventilation must be performed when electrical interference caus es interruption of ventilator delivered mechanical ventilation Manual ventilation must be continued until the ventilator resumes normal oper ation or an alternated ventilator anesthesia system can be used Troubleshooting by Alarm Messages Alarm Message Symptom 12 hour test Inspiratory Overshoot Pinspired not achieved PEEP Not Achieved Heliox Mode is ON VT Not Achieved Bellows Empty Check O sensor Circuit Auxiliary 4 40 1503 0151 000 Condition Probable Cause Service Action 12 continuous hours since last Cycle mechanical ventilation ON OFF state test and OFF PAW is greater than Pinspired Change threshold threshold Pmax does not reach a Pinspired 1 User may still have control of threshold actua
147. tion status Fail StatCal sd Go To Main Menu Remarks Fail indicates a problem with the SIB check for bad differential pressure trans ducer Check the transducer outputs using the Display A D menu Ensure that the flow sensors are disconnected from the interface panel If the transducer is out of tolerance replace the SIB assembly Calibrate Flow Sensors Directions for calibration 1 Disconnect flow sensors from patient interface panel 2 Select Start Cal to start the calibration 3 Reconnect flow sensors upon completion of calibration Inspiratory flow sensor failed Current calibration status Fail Go To Main Menu Remarks Fail indicates a problem with the SIB check for bad differential pressure trans ducer Check the transducer outputs using the Display A D menu Ensure that the flow sensors are disconnected from the interface panel If the transducer is out of tolerance replace the SIB assembly 4 26 1503 0151 000 5 26 0 4 Tests and Troubleshooting Calibrate Flow Sensors Directions for calibration 1 Disconnect flow sensors from patient interface panel 2 Select Start Cal to start the calibration 3 Reconnect flow sensors upon completion of calibration Expiratory flow sensor failed Current calibration status Fail StatCal Go To Main Menu Remarks Fail indicates a problem with the SIB check for bad differential pressure trans ducer Check the transducer outputs using the Displ
148. tup Count System Time 4606 ticks 4158 ticks 4206 ticks 2105 ticks 4605 ticks 23555 ticks 251355 ticks 3906 ticks 6857 ticks 256556 ticks Current Bootup Count 732 Remarks Error Code 10045 hex 10045 hex 10045 hex 10045 hex 10045 hex 10029 hex 10029 hex 10045 hex 10045 hex 10045 hex Address 5EB28 hex 5EB28 hex 5EB28 hex 5EB28 hex 5EB28 hex 5EB28 hex 5EB28 hex 5EB28 hex 5EB28 hex 5EB28 hex Clear Error Log Go To Main Menu Note The following Error Log table lists codes for those errors that pertain to ser vice Other codes will display from time to time however these are software in formational codes only and should not be of concern to a service person The software clears the errors that have been logged when Clear Error Log is set so a new listing may be compiled 4 18 1503 0151 000 5 26 0 4 Tests and Troubleshooting System Error Log Codes The following table of error codes are numerical in order and may be referenced from the System Error Log menu displayed Check the number on the menu and reference this table for description and service action Actions are numbered in a logical action sequence If action 1 fixes error stop there if action 3 fixes error return actions 1 and 2 to previous status Error Code Description of error logged Service Action 10023 Defaults loaded to non volatile 1 If EEPROM or CPU board were replaced memory EEPROM clear error log and reboot 2 EEPROM
149. uit board CAUTION A Disconnect the internal battery before attempting to remove or repair any circuit board Failure to do so may damage the internal electronics Pneumatic quick connect fitting from main manifold Connector from pressure sensor switch J8 Connector from GIV solenoid J6 connector from flow valve J7 1 2 3 4 Figure 6 12 Microcontroller board connector and cable identification around manifold pres sure transducer 6 14 1503 0151 000 5 26 0 6 Repair Procedures If removing the microcontroller board remove the following connections see illus tration numbered callouts to follow the steps below listed Board removal requires power supply board removal to clear the pneumatic fitting and the transducer mounted on the microcontroller board CAUTION 4 A The circuit boards are electrostatic sensitive Use an anti static work sta tion and wear a wrist grounding strap Disconnect the cable connector J8 between the pressure sensor switch to the transducer Disconnect the cable connector J6 from the solenoid switch on the gas inlet valve to the microcontroller board Disconnect the cable connector J7 from the flow control valve to the micro controller board Disconnect the pneumatic line from the manifold block to the transducer at the quick connect fitting Cable disconnects in figure 6 10 and the following releases the microcontroller board and the power supply board from all cable
150. umatic quick connect 7 Power supply board 18 Flow control valve 8 Pressure transducer 19 Drive gas check valve 9 Regulator 20 Pneumatic electronic barrier 10 Gas inlet valve GIV 21 Microcontroller board 11 Lock knob for mounting 22 Power module chassis Figure 6 9 Sub assembly locations reference 6 10 1503 0151 000 5 26 0 6 Repair Procedures 6 5 Printed circuit board and power module removal Removing the Power Supply circuit board and the Microcontroller circuit board Note To remove the microcontroller circuit board you first must remove the power supply circuit board Removing Power Supply circuit board ol A G N Battery cable connector J1 Alarm speaker connector to microcontroller board J1 Ribbon cable microcontroller board to power supply board J2 Ribbon cable microcontroller board to power supply board J3 Ribbon cable microcontroller board to front panel board J5 1 2 3 4 5 Figure 6 10 Disconnecting cables for circuit board removal 1503 0151 000 5 26 0 6 11 6 Repair Procedures 6 12 If removing the power supply board or the microcontroller board remove the fol lowing connectors see illustration numbered callouts that correspond to the follow ing steps 1 Disconnect the battery cable connector J1 from the power supply board Connector has lock tabs Disconnect the ribbon cable connector J2 between the microcontroller board and the power supply
151. und where manifold pressure is 91 92 cm H20 Wait for the flow to stabilize Once the flow stabilized set the flow to 12 L min Wait for the flow to stabilize Perform steps 1 6 replacing step 3 with 11 L min 10 L min 9 L min 1 L min Therefore there are 12 points that are calculated for the bleed resistor calibration Calibration points may be greater than the listed cm H5O but if any one of these points is less than the cmH5O listed below calibration fails If the calibration pass es the calculated bleed resistor calibration points are stored in EEPROM 67cm H20 59cm H20 52cmH20 45cm H20 38cm H20 30cm H20 24cm H20 18cm H20 12cm H20 7cmHO 5cemH20 5omHo0 1503 0151 000 5 26 0 4 33 4 Tests and Troubleshooting Sensor s Cal Due 4 34 This menu displays which sensors or setting must be performed when the Sen sors Cal Due alarm appears in normal operation After the cal setting is properly completed the text for that cal setting will be removed If the Sensor s Cal Due alarm is not active the menu displays the text Sensor s Cal Due alarm not active No calibrations required Sensor s Calibration Uue The selections on this menu are the Calibrations Settings that are required when Sensor s Cal Due alarm is active Perform each of the Calibrations Settings selections starting with the upper most selection If the Sensor s Cal Du
152. ut j WV ATOD BUSY 582 8 MECH VENT EN SH1 6 DAC_RESET SH1 IRQ6 XDOUT7 gl RESET d ee TXDB 340 SH1 mus CNTRL IACKG m sui IXDA 340 sui CHG_DISABLF_340 SH1 AC_LED_C SH6 SCLK PLUS SH1 EXTERNAL LK MIN SH1 INTERFACE SDAI INSP Bus NY SDA2_EXP SH5 E2 POWER SH5 GIVON RR SH1 XDOUT 0 7 SHS Figure 8 10 Microcontroller board schematic diagram page 4 of 10 7900 Ventilator 1503 0151 000 1 97 8 11 8 Schematics SH8 SH2 SH7 SH1 5 SH1 SH1 4 6 7 SH1 3 SH2 SH2 SH2 SH4 SH1 SH4 SH1 SH1 5 5V 130LT3 R149 15V ToK R148 tov TOK 4 178w J4 15 Rig TEST BDM ATOD_REF_TST 1 8W 15V_TST ATOD_CLK_TP 1 15V TST 178W R188 AGND RESET Bey 10K R203 V BAUD_CLOCK 5 5V_TST VDD C96 0 1UF o CR9 TPS71500D Do u 8 9 1 2 3 a RESET m 6 j 10 15 50v 74HC14 178W R116 4 99K CR10 1 8W 1S0nTS C103 U48 SEND TUE 1UF _ pcwp 15 ue upo So RESET 17 74HC14 E ee sr BDM 16 D O 15 Do U21 D3 LM4860M c92 2 DS BDM 5d 0 1UF MO 3 BERR BDM A 0 23 DS 1024 a 4 DSCLK BDM De M2405 INF V 5 FREEZE BDM D7 RO RESET BYPASS S RESET 7 DSI BDM A0 SHUTDOWN 8 SO SEDE AUDIO WE HP IN1 AUDIO CS UBCTINZ R115 GND 1 4 8 9 16 200 1 EXT_CS 1 8W XDOUT 0 7 XDOUT7 C120 VDD VDD 0 1UF VDD R198 R181 74FCT574 ate 4 99K SS 4 99K R129 50V 1 1 4 99K 1 8w 1 8w NOTE THIS CIRCUIT IS NOT INSTALLED i R130 U4
153. vement while you apply pressure downward 6 4 1503 0151 000 5 26 0 6 Repair Procedures Di ums ge eis Cable that connects the ventilator to the anesthesia machine SIB Power cord connector to ventilator Power cord retainer bracket Power cord retainer bracket mounting screws Ventilator mounting shelf slides into anesthesia machine shroud Power cord plugs into the anesthesia machine electrical outlet box Ventilator shelf mounting screws mounts the shelf to the bottom of the ventilator chassis Ventilator shroud Mounts onto the top shelf and has a front bezel Figure 6 4 Non integrated 7900 ventilator and mounting tray insertion 1 Remove the dual hose for drive return gas connecting the bellows to the exhalation valve Remove the exhaust hose from the exhalation valve manifold Loosen the thumb screws 2 which hold the ventilator mounting tray in the key slots of the shroud 1503 0151 000 5 26 0 6 5 6 Repair Procedures 4 Slide the mounting tray and ventilator out the rear of the shroud far enough to access the power cord and supply gas hose Disconnect the gas supply hose Remove the two mounting screws remove the bracket and power cord Disconnect the cable from the ventilator that goes to the SIB in the machine CAUTION A The ventilator weighs approximately 40 pounds Use care in its removal Remove the 7900 Ventilator and mounting tray from the anesthesia machine It is necessary to remove the
154. vice shelf so the locking screw fits below the mounting rail Slide ventilator toward the front on the rails so locking screw slides in the notch Tighten the securing knob to hold the ventilator to the ser vice shelf A The ventilator must sit on the left edge of the gas machine work surface to clear cables and hoses Use care to prevent the ventilator from slip ping off the surface and possibly causing damage to the ventilator or in jury to the person servicing the ventilator 1503 0151 000 5 26 0 6 Repair Procedures 6 4 Removing the top cover 1 Top cover mounting screws 4 2 Ground wire do not pinch when replacing cover Figure 6 8 Removing the top cover screws and cover Once the ventilator is secure upon the service shelf and firmly located on the gas machine work surface remove the four screws holding the louvered cover to the ventilator chassis Remove the cover for access to the internal pneumatic assem blies and circuit boards Remove the ground wire from the top cover which connects the cover and chassis Set the cover aside in a safe place 1503 0151 000 5 26 0 6 9 6 Repair Procedures 1 2 3 4 5 6 7 8 9 10 11 12 13 1 Battery retainer 12 Supply gas filter 2 Front panel board 13 Locking handle 3 Battery harness 14 Exhalation valve block manifold 4 Ground wires 15 Pneumatic bleed resistor 5 Speaker 16 Mechanical over pressure valve MOBO 6 Isolation transformer 17 Pne
155. witch Using the APL adjustthe pressure to 10 20 40 60 and 70 cm H20 Mter each setting wait5 seconds and push the rotary encoder switch to save the value um coc n LM Save Value Calibration Status Start Cal Go To Main Menu Pressure Sensitivity Calibration Directions for pressure sensitivity calibration 1 Perform the Cal flow sensors per the directions on that page 2 Set fresh gas flow to 10 Lpm 3 Occlude the opening at the bag arm 4 Connect short patient tubing from insp flow sensorto exp flow sensor 5 Set ventilation switch to Bag APL mode 6 Turn mechanical ventilation on the green LED should be on 7 Select the Start Cal selection and push the rotary encoder switch 8 Using the APL adjust the pressure to 10 20 40 60 and 70 cm H20 9 After each setting wait 5 seconds and push the rotary encoder switch to save the value Calibration Status Adjust pressure to 10cmH 0 Start Cal Go To Main Menu 1503 0151 000 5 26 0 4 28 4 Tests and Troubleshooting Pressure Sensitivity Fail 1 Select Display A D Channels from the main service menu Set Fresh gas flow to 2 Lpm Open the APL valve 0 cm H20 Place Bag to Vent switch in the Bag APL position Connect a short tube between the inspiratory and expiratory flow sensors The airway pressure inspiratory flow and expiratory flow on the ventilator display should read near zero between 5 and 5 Lpm flows 2 Occlude the
156. y functioning ABA dia phragm and seat assembly 5 26 0 1 Check cable connection 2 Check cable connection 3 Replace EL display 4 Replace CPU board 5 Replace power supply board 1 Is the cord plugged in 2 Is the power outlet o k 3 Check power cord fuses in the power module 4 Check cable connection 5 Verify output voltages of power supply Replace power supply board 6 Replace front panel keyboard 1 Adjust audio from menu 2 Ensure cable is plugged in 3 Replace speaker 4 Replace CPU board 1 Check breathing circuit and absorber for leaks 2 Check the bellows to base attach ment 3 Check the entire surface of the bel lows Pay close attention to the angles in the convolutions 4 Check that settings on flowmeters are adequate 5 Check diaphragm and seat assembly 4 Tests and Troubleshooting Symptom Bellows distended and or slips off base Continuous flow of supply gas before machine is turned ON Bellows does not descend during inspi ration Alarms sound with out apparent cause and cannot be silenced Ventilator will not turn on when remote on off switch is turned on and AC LED is on Settings do not meet specifications Erratic pressure waveform Slow exhalation pres sure release Probable Cause 1 Bellows retention problem 2 Bellows assembly exhaust restricted 3 Bellows assembly pressure relief valve problem 1 External hose l
157. y the glue logic Both LEDs require no interven tion from the microcontroller Rotary Encoder Input This quadrature signal is debounced and routed to a quadrature clock converter which interrupts the 68340 processor at each detent position 1503 0151 000 3 27 97 2 Theory of Operation Mechanical Ventilation Switch This switch is electronically debounced and it inputs to a hardware latch which tog gles between set and reset states with each depression of the switch The output of this latch directly drives the ventilation state LED on the front panel as well as controlling the drive signal to the flow valve independent of the processor The latch is reset by the power up hard reset signal an IRQ7 Interrupt a processor control signal or a switch depression The state of this latch as well as the direct switch signal is input to the 68340 processor for monitoring purposes Audio Alarm The audio alarm meets the requirements of the ISO standard 9703 2 Anesthesia and Respiratory Alarm Signals Part 2 Auditory Alarm Signals The circuit consists of a Yamaha YM2413 Sound Generator and a National Semi conductor LM4860M audio amplifier The sound generator interfaces directly to the CPU and the audio amplifier drives an 8 ohm speaker Manifold Pressures A Setra pressure sensor model 210 PCBM monitors manifold pressure It is lo cated in the oxygen isolation barrier between the electronics and pneumatics chambers The signal
158. ystem clock Logical monitoring is accomplished by assigning a unique watchdog toggle address to each defined mode of operation and detecting a sequence error if due to program flow interruption an operating mode is entered illegally The output of this watchdog is connected to IRQ7 on the 68340 processor Error Response Sequence Errors detected by either watchdog are handled in the following sequence At the first detection of any error a watchdog responds by issuing an IRQ7 interrupt Ifthe exception handler software for IRQ7 cannot correct the error then the next detection of an error causes a soft system reset lfthe error still cannot be corrected then an audio alarm sounds in dependent of processor interaction and a cyclic soft reset contin ues until the error is corrected or the system is powered down 1503 0151 000 3 27 97 2 18 2 Theory of Operation DATA Acquisition The data acquisition system for the 7900 Ventilator consists of two major building blocks The first is an analog to digital converter ADC system and the second is a digital to analog converter DAC system This portion of the 7900 Ventilator allows the Mercury microprocessor to interface with valves and pressure transducers The data acquisition system is also used for internal monitoring of safety relevant signals The ADC system is designed to meet the following specifications Resolution 12 Bits Input Voltage Range 0 4 095 Vo

OHMEDA 7900 Ventilator Service Manual

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