Home

NPB-195 Service Manual - Frank`s Hospital Workshop

1. 1227 O RESETL RAMHCSL RAMLCSL D 15 0 D 15 0 Figure 11 9 CPU Memory Schematic Diagram B 035354 11 23 035354 gt VDD U56 1321 TLC27L2 3 1 2 R93 2 4 99 Us U56 7 I315 POM 4 C1 10 C1O4 C106 47U 47U 47U 47U C88 TN 10V 10V 1 O 1U 26 TH VCC GND1 VI2 vo1 VI4 vo2 Ka 1180 TP40 TP44 o 4 6 5 74HCOOS 8 A gt 55 5 U24 POTCSL SERCLK i AAA X9313 EPOT I294 6 N C GND2 TDA7052A SPEAKER DRIVER SERDATA U25 LT1013S 74HCOOS 7 RAW 10V RAW 10V Figure 11 10 Contrast and Sound Schematic Diagram A 11 25 2817 MAIN_OUT 2 BL 1 y cd 8820 U33 MBRS330T3 LT1121CZ MBRS130 R112 i OUT 2 H H R116 GND AA 2 100K CR21 MBRS130 1N914S R119 HG1 HG2 249K GNDVIA GNDVIA Open Collector Output Active Low Indicator Requires Heatsink NPB 891196 U35 TP46 CR18 LM393S 1N914S E Q16 3 1 To Linear Power Supply SI9953 CON_4L_156 U36 LM2940H
2. Figure 11 15 Power Supply Parts Locator Diagram 035800 11 35
3. List Of FIQUIES List Of Tables A ee ee ed Section 1 INtroduEUON iss ks iia 1 1 Manual COverview 1 2 Npb 295 Pulse Oximeter Description 1 3 Related Documents Section 2 Routine Maintenance 2 1 Cleaning iia a A 2 2 Periodic Safety And Functional Checks 2 3 Battery ud recen en RE ese dor Section 3 Performance Verification 3 1 ntroducti nma a u 3 2 Equipment 66 40 sss 3 3 Performance Tests t t eto i iustus 3 4 Safety Tests cnn ett 03828 Section 4 Power On Settings And Service Functions 4 1 Introduction ero RR Rn 4 2 Power On Settings Ge eite o ei Se 4 3 Service Functions edt dete ae ert ir dass Section 5 Troubleshooting ee ee HT 5 1 Introduction RO 5 2 How To Use This Secfion ee ee 5455555555 5855555555 5 3 Who Should Perform 8 5 ees se se ee ee 8555 5 4 Replacement Level Supported 5 5 5 Obtaining Replacement
4. 74HCA4520S 74HC4520S Figure 11 5 Front End Power Supply Schematic Diagram 035354 11 15 0 u14 6 2 1 74HC14S e 5 U49 o MBRS130 CR8 LT1129CST 5 2 s IN 5 EE GND1 GND 4 C46 19 1 47 4 O 1U 10V Z5U U14 1 74HC14S LGA VDD v o Q6 14 R170 9936 2 4 15 15 cao U14 74HC14S 74HC14S 330P74HC14S 1 I 50v EI Z Z o o U9 U14 12 74HC14S 14 14 5 S 8 74HC10S TL TL 74HC10S U15 U15 1140 1 74HC14S 74HC14S ITX485_EN TX485 EN 2N3906S 326 AAN 3 2 2N3906S 165 Q27 3 N C Z AGV414AI Y o N O ZA AQV210EHA l Figure 11 6 SIP SOP Interface Schematic Diagram 035354 11 17 RS 232 DRIVER 1243 IVDD RS 485 DRIVER C1 C2 caa CMOS LEVEL lt 5232 EVEL oe 22 RCV 232 12 R1OUT x R1IN 13 RXD 232 Z5U 14 RCV_232 VCC a 9 R2OUT R2IN 8 d RSENAB 166 o lt 01167 MAX489 ITXD 11 TAN T1OUT 14 TXD 232 RXIN 11 RXD NC_LVL 10 T2IN T20UT 7 NC 232
5. 1283 1157 PIC_RB3 PIC HB1 PIC HB2 FRONT END LED_IDRV 10V 10V z c ca 0 1 O 1U Z5U Z5U DG201S BYPASS Figure 11 3 UIF PCB Front End Red IR Schematic Diagram 035354 11 11 2 VCC2N3906S Q25 R192 166 10 0K Q11 2 2N3906S 3 PIC HRHC1 2 2N3906S Q24 2 MPSA56S PIC_RB1 PIC_RA2 6 11 Qs 3 3 10 9 oer 12 2 1 NA MM 5 3 x Y z VEE LT1013S 2 U31 154 x PIC BRC1 Y z 147 o R70 10 0K VEE 7 AAA C1 4 TN 20V PIC_RA1 PIC RAO U11 2 2 RAO RA1 RA2 RAS NIO O AOIN RA4 RAS OSC1 osc2 VDD RBO 177 179 181 0 78 0 180 0 0 RB1 RB2 PIC_RB2 RBS PIC_RB3 RB4 PIC HB4 RBS PIC HB5 RB6 PIC HB6 RB7 PIC_RB7 RCO RC1 RC2 sod 145 ROS RC4 MISO 8 3 vss CD4053S MCLR VSS 1 VSS2 S CD4053S PIC16C63 RC5 MOSI RCG RC7 Q2 MPSAO6S 2 4053 BYPASS PIC 1
6. A1 8888 18 FRONT PANEL J PAWER SUPPLY 626 QH Qa Q3 q Q2 Figure 11 13 UIF PCB Parts Locator Diagram 035351 11 31 HIGH CURRENT VIAS abort 110 111 A d pat E3490A eae war NEUTRAL TH Say CR a SMC J22C 22V N SMCJ22C E2 EPS2aPCa 3 10 FAC TUI OB24 9 2ASB TH AC TH Power Entry 6 ESD Protection FAN CTRL Main Board D BATT_CHK O w7 MAIN_DC MAINS wo Battery Charge BATT OUT O we Du GND TP2 Q2 ah RF9510 TH h o 18 3 U3 oe VIN FAN CTRL 2N7002S Requires Heat Sink GND VOUTI u2 2 CR7 Nellcor 891196 LM385S LMS35D TH 1 h 3 112 CR4 2 R7 i cre 1914S MBRS330T3MTS50B 154K TH Ea US 3 4 1 A CHG_OU Ki BATT wa Battery 1N914S 2ASB TH ws Battery BATT_CHK Figure 11 14 Power Supply Schematic Diagram 035799 11 33 SIDE NELLCOR PURITAN BENNETT o PB 190 LPS Ti Legs ay GRA RI AZI RTS AZI CO Que T RI B a Ro I IMG a 550
7. 11 15 Figure 11 6 SIP SOP Interface Schematic Diagram 11 17 Figure 11 7 Data Port Drivers Schematic Diagram 11 19 Figure 11 8 CPU Core Schematic Diagram 595 5 11 21 Figure 11 9 CPU Memory Schematic Diagram B 11 23 Figure 11 10 Contrast and Sound Schematic Diagram A 11 25 Figure 11 11 UIF PCB Power Supply Schematic Diagram B 11 27 Figure 11 12 Display Interface Schematic Diagram 11 29 Figure 11 13 UIF PCB Parts Locator Diagram 11 31 Figure 11 14 Power Supply Schematic Diagram 11 33 Table of Contents LIST OF TABLES vi Figure 11 15 Power Supply Parts Locator Diagram 11 33 Table 3 1 Dynamic Operating Range 3 7 Table 3 2 Earth Leakage Current Limite 3 10 Table 3 3 Enclosure Leakage Current Limits 3 11 Table 3 4 Patient Leakage Current Lmmts 5 59555 9955 3 12 Table 3 5 Patient Leakage Current Test Configurations Mains Voltage on the Applied Patt 3 12 Table 4 1 Factory Default Settings A 4 2 Table 5 1 Problem Categories AAA 5 2 Table 5 2 Power Problems ee ee ee HT nh ket 5 3 Table 5 3 Button Probleme 5
8. SIPSOP_EN 1328 SDA LO 8601 19 B601 SCL EA BACKGROUND DEBUG CONNECTOR VDD 0 15 324 RESET PWMA PWMB PCLK PAI ICH IC2 IC3 IC4 OC5 OCH oca Oca oca RXD TXD SCK MISO MOSI PCSO SS PCS1 PCS2 PCSS3 A19 CS6 A20 CS7 A21 CS8 A22 CS9 A23 CS10 Do BKPT DSCLK IPIPE DSO IFETCH DSI FREEZE QUOT TSTIME TSC CSBOOTI BR CSO BG CS1 BGACK CS2 FCO CS3 FC1 CS4 FC2 CS5 RAT RA2 RAS RA4 RAS RAS m BATLEDDR y ASLEDDR MOTNLEDDR TP59 RAMPWR RTCSEL SERDATA 1282 A 17 0 RROMLATECSL lt 53 ROMLATECSI D O 15 L4 vs x2 eN 2 768KH ECPSM29 3 DS1302Z B REAL TIME CLOCK FRONT_END_RST D15 R WLR 1 ERASE DSL o 1205 ASL 1204 SDA2 1758 128X8 SCL PWRS SDA 60 SERCLK SER TA BKPTL IPIPEO IPIPE1 FREEZE KBBOTR RA1 1209 g 5517 5 i213 RROMLATECS g RROMLATECSL 1213 m ie29 RDSPLHDL c 1228 RPBCSL 1230 RDSPLCSL 1179 BOOTROM RRAMLCS RRAMHGESL
9. D RCV_485 2 RSROU RXIN 12 RXD 1168 v GND 6 15 DS ITX485_EN 4 TXENAB ADM202E z TXOUT H 10TED SMCJ10C ITXD E TXOUTH 9 TXD AN_PULSE AN_SPO2 00 ANIA O O CH NY AY 0 O N 0 AN_PLETH NC NO 8 BIT DAC E NC COM CON DBi15F VDD REFO SS NC NC TH REF1 1176 Ca2 1 OU 7 2ov REF2 REFS ADO AD1 OUTO AN_SPO2 AD2 OUTA 16 co7 1 0 1 T DGND OCUTal 15 l e MAX520S U13 AGND OUT2 AN_PLETH C145 le 0 1U zsu LT1013 TLE2425CD 5 REFlLiv VIN VOUT 3 GND 2 Figure 11 7 Data Port Drivers Schematic Diagram 035354 11 19 035354 POTCSL 1237 1236 LT BATT CHECKOOON 1 BK LT ONL CRIT_BATT L Le TX485_EN Y Y Y L8 AK 5601 TXD PWM_VOL FONTSEL AC OK L LOW BATT L BIN PRS L RTCSEL TURN_OFF DISP_EN RWD_RST PWM_FREQ CLRIII MISO MOSI
10. e type of instrument delivering the information e software level type of printout e alarm parameters The second line is the headings for the columns The first and second lines are printed out every 25 lines or when a change to an alarm limit is made Patient data is represented with a date and time stamp for the data In the example above the means that a sensor was connected but no data was being received patient disconnect Patient data that is outside of an alarm limit is marked with an At the end of the printout Output Complete will be printed This indicates that there was no corruption of data If the Output Complete statement is not printed at the end of the printout the data must be considered invalid ERRLOG Mallinckrodt Customer Service Engineer Only A list of all the errors recorded in memory can be obtained by pressing the Errlog softkey The first two lines are the column heading lines The type of instrument producing the printout software level type of printout and the time of the printout are listed in the first line The second line of the printout is column headings If nothing prints out there have been no errors An example of an Errlog printout is shown in Figure 4 6 NPB 295 Version 1 0 0 000 Error Log 14600 00 07 Op Time Error Task Count 10713 21 03 52 12 100 00634 26 01 37 4 3 Output Complete Figure 4 6 Errlog Printout INSTAT Mallinckrodt Customer Service Engineer Only
11. 14 hours for full charge in standby 18 hours for full charge in use 2 each 5 X 20 mm Slow Blow 0 5 Amp 250 volts 100 120 volts AC 50 60 Hz or 200 240 volts AC 50 60 Hz 20 VA 33inHx 10 4 in W x 6 8 in D 8 4 cm H x 26 4 cm W x 17 3 cm D 5 7 Ibs 2 6 kg 5 C to 40 C 441 F to 104 F 20 C to 70 C 4 F to 158 F 20 C to 60 C 4 F to 140 F 9 1 Section 9 Specifications Operating Altitude 390 m to 3 658 m 1 280 ft to 12 000 ft Relative Humidity 15 RH to 95 RH noncondensing 9 5 ALARMS Alarm Limit Range Saturation 20 100 Pulse 30 250 bpm 9 6 FACTORY DEFAULT SETTINGS Table 9 1 Default Settings Display Nurse Call Polarity Pulse Beep Volume Pulse Rate High Pulse Rate Low 9 7 PERFORMANCE Measurement Range SpO2 0 100 Pulse Heart Rate 20 250 bpm Accuracy SpO2 Adult 70 100 2 digits 0 69 unspecified Neonatal 70 100 2 digits 0 69 unspecified 9 2 Section 9 Specifications Accuracies are expressed as plus or minus X digits saturation percentage points between saturations of 70 100 This variation equals plus or minus one standard deviation 1SD which encompasses 68 of the population All accuracy specifications are based on testing the subject monitor on healthy adult volunteers in induced hypoxia studies across the specified range Adult accuracy is determined with Oxisensor IT D 25 sensors Neonatal accuracy is
12. 4 5 Section 4 Power On Settings and Service Functions The Delete softkey described in operator s manual allows the user to delete the most recent trend data The current trend data along with the deleted trends can be retrieved from the instrument through an Instat printout The oldest deleted trend is Trend 1 on the Instat printout Ifa Trend 1 already exists in memory from an earlier Delete the next deleted trend will become Trend 2 Every time a Delete is performed from the User Softkeys the number of existing trends will increase by 1 The current trend will have the largest trend number Figure 4 7 illustrates an Instat printout The first two lines are the column heading lines Line one is for instrument type software revision level type of printout and alarm parameter settings The second line contains the column headings A trend point is recorded for every 2 seconds of instrument operation Up to 24 hours of instrument operation data can be recorded The final line on the printout shows Output Complete This indicates that data has been successfully transmitted with no corruption If there is no Output Complete line printed the data should be considered invalid NPB 295 Version 1 0 0 000 Instrument 3002 Limit 30 10056 TIME Trend 01 PR bpm PA SpO2 Status 01 Jul 97 14 00 00 222 mE SD PR Limit 100 180 bpm UIF Status Aud BULB AO L 01 Jul 97 Jul 97 01 Jul 97 NPB 295 TIME 01 Jul 97 01 Jul 97 01 Jul 97 14
13. PIC_RSTL VREF Ca O 1U Z5U x 90 Sil lt IO NO IN lt N a 2 AN gt 4 H 0 lt FRONT_END_RST PIC BRCO EE d R63 U31 10K_0 1 LT1013S CD4053S 9o U10 TLC339CD 13 O PIC_BRC7 R57 5 PIC_BRCG 100K e ANN R60 30 1K R59 10 0K ii d 0 x J16 CON_SPO2 Figure 11 4 Analog Front End Schematic Diagram 035354 11 13 1115 T2 TP6 VREF cna LPE 4841 MBRS130 712 N 9 W VIN vour 1 cR GND1 GNDaS e GND2 GND4 8 3 on220 cR11 C77 78LO5D ww 1N914S 1000P FB 5 5 2 y 1 NFB 4 o 108 1113 O 282 1112727255 MBRS130 HIGH CURRENT C32 tou E 1126 o 16V mie VCC BRAW 1OV Jr ge RESETL CLK 312KHZ 10 1 M 2 74HCOOS MBRS130 SH9 CONTRAST g RAW 5V CR4 1121 6 E MBRS130 SH9 CONTRAST g RAW 10V D CLK 156KHZ 0 U51 16 vee PIC_10MHZ 8 Po Go CLK_312KHZ Ga CLK_156KHZ L190 CP1 32 os 15 RST
14. 80 mA Replace power supply if above values are not met Check the ribbon connection from the bottom enclosure to the UIF PCB as instructed in paragraph 6 5 of the Disassembly Guide section If the connection is good replace the UIF PCB The battery may be discharged To recharge the battery refer to paragraph 3 3 1 Battery Charge The monitor may be used with a less than fully charged battery but with a corresponding decrease in operating time from that charge Ifthe battery fails to hold a charge replace the battery as indicated in Section 6 Disassembly Guide There are 15 minutes or less of usable charge left on the NPB 295 battery before the instrument shuts off At this point if possible cease use of the NPB 295 on battery power connect it to an AC source and allow it to recharge approximately 14 hours The NPB 295 may continue to be used while it is recharging A full recharge of the battery while the monitor is being used takes 18 hours Replace battery if more than 2 years old Open the monitor as described in Section 6 Verify the power supply s output to the battery while on AC Disconnect the battery leads from the power supply and connect a DVM to them The voltage measured should be 6 8 0 15 volts DC and the current should be 400 80 mA Replace power supply if above values are not met 5 3 Section 5 Troubleshooting 5 5 2 Buttons Table 5 3 lists symptoms of problems
15. RAMHCSL M RDSPLCSL DSPLYCSL RDSPLRDL RPBCSL DSPLRDL 120 PSLEDDR 1212 PBCSL 66 CLKOU b 1208 78 mVDD 1231 61 ND De 1227 VDD aso C130 O 1U 32 768KHZ pi y C140 138 22p ECPSM29T L 22 50V 5OV AO Z5U 1 O 1U A2 C132 wP GND AT24CO1A CR29 ba VC1206 5 6V Jg PBRST vcc TD ST 6 GND RsT 2 2 3 TOL RSTE 4 LTC1232 a 1130 R151 221 AAN jm D RST Figure 11 8 CPU Core Schematic Diagram A 11 21 112 A 17 0 FLASHPWR a 52222222 A14 A15 A16 A15 ATZ A16 j D15 13180 RY a ESETI BYTE RESETD N q 00G HHE ddxdN da R WL 43 E GND L18 FLSHOEL 14 GND2132 29F200 FLASH DA H A a N RAMPWR ROMLATECSL E e _BCOTFLSHL A 17 O EPOTROME 128KX8 128KX8 PWR PWR 32 27 26 23 25 4 28 1 3 31 2 17 2 17 16 74HC32S RAMHCSB2 RAMLCSL CEL RESET so 74HCOOS RESETL 30 RESETL 30 24 RAMOEDIS 24 SE R WL 299 RAWL 25 We GND 431000S 431000S
16. 00 05 14 00 10 14 00 15 Version 1 0 0 000 Trend 01 14 24 24 14 24 29 14 24 29 SpO2 19 79 0 Version 1 0 0 000 120 120 Instrument PR bpm 58 57 0 Instrument 5 220 220 SpO2 Limit 80 10056 PA SpO2 Status 220 PS SL PL 220 PS SL PL PS LP SL PL SpO2 Limit 80 10056 BU LB AO BU LB BU LB PR Limit 60 180 bpm UIF Status Aud BU LB M BU LB AS BU LB AS H PR Limit 60 180 bpm NPB 295 T IME Trend 01 SpO2 Jul 97 7 13 02 99 Jul 97 7 13 07 Jul 97 7 13 12 Jul 97 7 13 17 Jul 97 7 13 22 PR bpm PA SpO2 Status 132 220 PH 132 220 132 220 132 220 132 220 132 220 132 220 Jul 97 7 13 32 utput Complete 1 1 1 1 1 11 Jul 97 7 13 27 1 O Figure 4 7 Instat Printout INFO Mallinckrodt Customer Service Engineer Only Pressing the INFO softkey produces a printout of instrument information Figure 4 8 A single line will be printed The data presented in the printout going from left to right is e instrument type NPB 295 e Version is the software version level type of printout INFO e CRC number Cyclic Redundancy Check e time in seconds current operating time total operating time Figure 4 8 INFO Printout 4 6 Section 4 Power On Settings and Service Functions Next Additional options can be accessed from the main Service Functions menu by pressing the Next softkey When Next is pressed the softkeys change to t
17. 3 Observe the monitor front panel With the monitor off press the Power On Off button The monitor must perform the following sequence a Within 2 seconds all LEDs are illuminated then all pixels on the LCD display are illuminated after which the backlight comes on b The indicators remain lighted 6 The LCD display shows the Nellcor Puritan Bennett logo and the software version of the NPB 295 Figure 3 2 r EU NELLCOR PURITAN BENNETT NPB 295 Nellcor Puritan Bennett NPB 295 Version 1 1 0 5 teum Figure 3 2 Self Test Display 3 2 Section 3 Performance Verification d A I second beep sound indicating proper operation of the speaker and all indicators turn off except the AC Power Battery Charging indicators e The NPB 295 begins normal operation 3 3 2 2 Power On Defaults and Alarm Limit Ranges Note Note Note When observing or changing default limits a 10 second time out is in effect If no action 1s taken within 10 seconds the monitor automatically returns to the monitoring display The descriptions that follow are based on the assumption that Pleth is the view that has been selected The steps to change an alarm limit are the same if the view being used is Blip Ensure that the monitor is on Press and release the Limits softkey Verify the monitor emits a single beep and the plethysmograph waveform is replaced with a display of the alarm limits The h
18. 4 Table 5 4 Display Alarms Problems A 5 4 Table 5 5 Operational Performance Problems 5 5 Table 5 6 Serial Port Problems sse 5 6 Table S7 Error Godes ume neq Se Ge te 5 7 Table 6 1 Power Supply Leads Connections 6 8 Table TA ni ii itenim debe 7 1 Table 9 1 Default Settings 9 2 Table 10 1 Data Port Pin Outs L HH emen 10 3 Table 10 2 Status Codes sss eene 10 6 Table 10 3 Nurse Call Relay Pin 5 88 10 7 Table 10 4 Rating of Nurse Call Relay ee ee AR 10 7 SECTION 1 INTRODUCTION 1 1 Manual Overview 1 2 NPB 295 Pulse Oximeter Description 1 3 Related Documents 1 1 MANUAL OVERVIEW This manual contains information for servicing the Ne cor model NPB 295 pulse oximeter Only qualified service personnel should service this product Before servicing the NPB 295 read the operator s manual carefully for a thorough understanding of operation Warning Explosion hazard Do not use the NPB 295 pulse oximeter in the presence of flammable anesthetics 1 2 NPB 295 PULSE OXIMETER DESCRIPTION The NPB 295 is a portable pulse oximeter intended for use as a continuous noninvasive monitor of arterial oxygen saturation SpO2 and pulse rate It can be used on adult pediatric and neonatal patients Oxygen satur
19. 6 Disassembly Guide Ifthe condition persists replace the UIF PCB 5 4 Section 5 Troubleshooting 5 5 4 Operational Performance Table 5 5 lists symptoms of problems relating to operational performance no error codes displayed and recommended actions If the action requires replacement of a PCB or module refer to Section 6 Disassembly Guide Table 5 5 Operational Performance Problems 1 The Pulse AMPLITUDE indicator seems to indicate a pulse but the digital displays show zeroes SpO2 or Pulse values change rapidly Pulse The sensor may be damaged replace it Ifthe condition still persists replace the UIF PCB The sensor may be damp or may have been reused too many times Replace it AMPLITUDE indicator is elio An electrosurgical unit ESU may be interfering with performance e Move NPB 295 and its cables and sensors as far from the ESU as possible Plug the NPB 295 power supply and the ESU into different AC circuits Move the ESU ground pad as close to the surgical site as possible and as far away from the sensor as possible Verify the performance with the procedures detailed in Section 3 Ifthe condition still persists replace the UIF PCB 5 5 Section 5 Troubleshooting 5 5 5 Data Port Table 5 6 lists symptoms of problems relating to the data port and recommended actions If the action requires replacement of the PCB refer to Section 6 D
20. NELLCOR PURITAN BENNETT NPB 295 ALARM LIMITS SP02 4 00 ele 110 O Figure 3 5 Adjusting High Pulse Rate Alarm Press and hold the Down Arrow button Verify the minimum displayed value is 40 for the Pulse upper alarm limit Press the exit button Press the Limits softkey then press the SELECT softkey three times Verify the Pulse lower alarm limit display indicates an alarm limit of 40 and is boxed BR NELLCOR PURITAN BENNETT NPB 295 9 ALARM LIMITS AN E O UPPER LOWER 85 40 1410 d o e e e Mo Figure 3 6 Adjusting Low Pulse Rate Alarm Press and hold the Down Arrow button Verify the boxed Pulse lower alarm limit display reduces to a minimum of 30 Press and hold the Up Arrow button and verify the boxed Pulse lower alarm limit display cannot be adjusted above the Pulse high limit of 40 Press the Power On Off button to turn the monitor off Press the Power On Off button to turn the NPB 295 back on Press and release the Limits softkey Verify the SpO2 upper alarm limit display is boxed and indicates an alarm limit of 100 Press the SELECT softkey Verify the SpO2 lower alarm limit display is boxed and indicates an alarm limit of 85 Press the SELECT softkey a second time Verify the Pulse upper alarm limit display is boxed and indicates an alarm limit of 170 Press the SELECT softke
21. are absorbed differently by body tissue their received signal intensities are at different levels Therefore the IR and red signals must be demodulated and then amplified separately in order to compare them to each other De multiplexing is accomplished by means of two circuits that alternately select the IR and red signals Two switches that are coordinated with the IR and red transmissions control selection of the circuits A filter with large time constant follows to smooth the signal and remove noise before amplification The separated IR and red signals are amplified so that their DC values are within the range of the A D converter Because the received IR and red signals are typically at different current levels the signal gain circuits provide independent amplification for each signal as needed The gain in these circuits is adjusted by means of the PWM lines from the CPU After the IR and red signals are amplified they are filtered to improve the signal to noise ratio and clamped to a reference voltage to prevent the combined AC and DC signal from exceeding an acceptable input voltage from the A D converter 11 8 5 Variable Gain Circuits 11 8 6 AC Ranging The two variable gain circuits are functionally equivalent The gain of each circuit is contingent upon the signal s received level and is controlled to bring each signal to approximately 3 5 volts Each circuit uses an amplifier and one switch in the triple SPDT analog multiplexin
22. isolate a suspected PCB follow the procedures in Section 6 Disassembly Guide to replace the PCB with a known good PCB Check to see if the trouble symptom disappears and that the monitor passes all performance tests If the trouble symptom persists swap back the replacement PCB with the suspected malfunctioning PCB the original PCB that was installed when you started troubleshooting and continue troubleshooting as directed in this section OBTAINING REPLACEMENT PARTS Mallinckrodt Technical Services provides technical assistance information and replacement parts To obtain replacement parts contact Mallinckrodt Technical Services or your local Mallinckrodt representative Refer to parts by the part names and part numbers listed in Section 7 Spare Parts 5 1 Section 5 Troubleshooting 5 2 Troubleshooting guide Problems with the NPB 295 are separated into the categories indicated in Table 5 1 Refer to the paragraph indicated for further troubleshooting instructions Note Taking the recommended actions discussed in this section will correct the majority of problems you may encounter However problems not covered here can be resolved by calling Mallinckrodt Technical Services or your local Mallinckrodt representative Table 5 1 Problem Categories Problem Area Refer to Paragraph Power No power up on AC and or DC e Fals power on self test e Powers down without apparent cause Buttons e Monitor does not respond
23. properly to buttons Operational Performance e Displays appear to be operational but monitor shows no readings e Suspect readings Display Alarms 5 6 3 e Displays do not respond properly e Alarms or other tones do not sound properly or are generated without apparent cause 5 6 5 Data Port e NPB 295 serial port not functioning properly All of the categories in Table 5 1 are discussed in the following paragraphs Section 5 Troubleshooting 5 5 1 Power Power problems are related to AC and or DC Table 5 2 lists recommended actions to power problems Table 5 2 Power Problems Recommended Action 1 Battery Low indicator lights steadily while NPB 295 is connected to AC and battery is fully charged The NPB 295 does not operate when disconnected from AC power Battery Low indicator on during DC operation and an alarm is sounding Battery does not charge 1 Ensure that the NPB 295 is plugged into an operational AC outlet and the AC indicator is on Check the fuses The fuses are located in the Power Entry Module as indicated in paragraph 6 3 and Figure 6 3 of the Disassembly Guide section Replace if necessary Open the monitor as described in section 6 Verify the power supply s output to the battery while on AC Disconnect the battery leads from the battery and connect a DVM to them The voltage measured should be 6 80 0 15 volts DC and the current should be 400
24. protocols supported by the data port The selections are e ASCII used for printouts e OXINET II to enable communication with Oxinet e Score analysis software Section 10 Serial Port Interface Protocol Note When using Score software use the latest version Contact Mallinckrodt s Technical Services Department or your local Mallinckrodt representative to determine the latest version of Score software e CLINICAL which is intended for Mallinckrodt use only e GRAPH used for graphical printouts will stop real time print data To change the communication protocol press Setup Next Select and Comm Use the Adjust Up Down buttons to select the desired communications protocol The baud rate may need to be changed to match the abilities of the attached equipment To change the baud rate press Setup Next and Comm Use the Adjust Up Down buttons to select a baud rate of 2400 9600 or 19200 Seven languages can be viewed on the screen and sent to the printer The language being used can be changed by pressing Setup Next and Lang Use the Adjust Up Down buttons to select the desired language The voltage polarity for the Nurse Call available at pins 11 and 5 can be selected through the softkeys By pressing Setup Next Next and NCALL a choice of NORM or NORM is offered NORM sets the voltage to 5 volts DC to 12 volts DC and NORM sets the voltage to 5 volts DC to 12 volts DC when there is no audible alarm Whe
25. the contacts for alarm and no alarm conditions and for instrument off Table 10 3 Nurse Call Relay Pin States No Alarm or Alarm Audible Instrument Off Silenced Alarm Table 10 4 Rating of Nurse Call Relay Maximum Input Voltage 30 volts AC or DC polarity is not important 120 mA continuous peak 300 mA 100 ms 26 ohms to 50 ohms 40 ohms typical during alarms Ground Reference Isolated Ground Electrical Isolation 1 500 Volts 10 7 ANALOG OUTPUT Analog outputs are provided for Saturation Pulse Rate and a Plethysmographic waveform These outputs are available only if the monitor is operating on AC power The output voltage is 0 0 to 1 0 volt DC for all three parameters A 1 0 volt DC output for saturation equals 100 for pulse rate it equals 250 bpm and for plethysmographic waveform it equals 255 pulse amplitude units pau The voltage will decrease as the values for these parameters decrease If no data for a parameter is available the output voltage for that parameter will be a 0 0 volts DC At power on after the completion of POST the instrument will initiate an automatic three step calibration signal The calibration signal will begin at 0 0 volts DC and hold that point for 60 seconds It will then jump up to 1 0 volt DC and hold that value for 60 seconds The third part of the calibration signal is a stair step signal The stair step signal will start at 0 0 volts DC and increase up to 1 0 volt DC in 1 10 vol
26. the partial pressure of arterial oxygen PaO2 the calculated value may differ from the NPB 295 SpO2 measurement This is because the calculated saturation may not have been corrected for the effects of variables that can shift the relationship between PaO2 and saturation Figure 11 1 illustrates the effect that variations in pH temperature partial pressure of carbon dioxide PCO2 and concentrations of 2 3 DPG and fetal hemoglobin may have on the oxyhemoglobin dissociation curve pH 100 Temperature ME P 02 Hs 2 3 DPG Fetal Hb 50 02 2 3 DPG Saturation pH H Temperature t PC T T 50 100 PO mmHg Figure 11 1 Oxyhemoglobin Dissociation Curve 11 3 CIRCUIT ANALYSIS The following paragraphs discuss the operation of each of the printed circuit boards within the NPB 295 pulse oximeter Refer to the appropriate schematic diagram at the end of this supplement 11 4 FUNCTIONAL OVERVIEW The monitor functional block diagram is shown in Figure 11 2 Most of the functions of the NPB 295 are performed on the UIF PCB functions on the UIF PCB include the 331 and PIC and Memory Other key components of the NPB 295 are the Power Entry Module PEM Power Supply and the LCD Display The Display module includes the Membrane Panel and the LCD Display The Membrane panel contains annunciators and push buttons allowing the user to access information and to select
27. to the factory default settings If Yes is pressed the instrument sounds three tones and the settings return to factory default values When No is pressed there are no changes made to the settings stored in memory SAVE When adjustable values are changed from factory default the Save button can be used to preserve the settings as institutional power on default values Pressing Yes stores the current settings in memory The instrument sounds three tones indicating that the changes have been saved as power on default values The new saved values will continue to be used through power on and off cycles until they are changed and saved again or until they are reset If No is pressed the changed values will not be saved Note An invalid tone indicates a parameter value cannot be saved as a power on default refer to paragraph 4 2 Along with the invalid tone a message will be displayed indicating which parameter could not be saved as a power on default PRINT Accessing the Print softkey makes four printouts available Refer to the Appendix for information about how to make connections to the data port and how data is presented in a printout The appropriate printout can be selected by pressing the corresponding softkey Figure 4 4 represents the softkey configuration after the Print softkey has been selected Up to 24 hours of trend data can be viewed on the printouts described below When the instrument is turned on trend data is record
28. 1 2 Alarm Volume Control After completing the procedure in paragraph 3 3 3 1 1 1 Press and hold the Alarm Silence button and verify the following a OFF 15 displayed for approximately 3 seconds b After 3 seconds e a steady tone is heard at the default alarm volume setting e the SpO2 display indicates VOL e Pulse display indicates the default setting of 5 2 While still pressing the Alarm Silence button press the Down Arrow button until an alarm volume setting of 1 is displayed 3 Verify the volume of the alarm has decreased but is still audible 4 Continue pressing the Alarm Silence button and press the Up Arrow button to increase the alarm volume setting to a maximum value of 10 5 Verify the volume increases Press the Down Arrow button until a comfortable audio level is attained 6 Release the Alarm Silence button The tone stops 3 6 Section 3 Performance Verification 3 3 3 1 3 Pulse Tone Volume Control 1 Press the Up Arrow button and verify the beeping pulse tone sound level increases 2 Press the Down Arrow button and verify the beeping pulse tone decreases until it is no longer audible 3 Press the Up Arrow button to return the beep volume to a comfortable level 3 3 3 1 4 Dynamic Operating Range 3 3 3 1 5 Nurse Call The following test sequence verifies proper monitor operation over a range of input signals 1 Connect the SRC 2 to the SCP 10 or MC 10 which is connected to th
29. 190 The Status column indicates alarm conditions and operating status of the NPB 295 In this example the PH means Pulse High A complete listing of the status codes is listed in Table 10 2 As many as 4 codes can be displayed at one time in the Status column 10 5 Section 10 Serial Port Interface Protocol Table 10 2 Status Codes Pulse Rate High Limit Alarm Pulse Rate Low Limit Alarm P Sat High Limit Alarm AO AS BU LB LM LP MO PH PL PS SD SH SL Sat Low Limit Alarm No Data Available Alarm Parameter Being Violated Note A Sensor Disconnect will also cause three dashes to be displayed in the patient data section of the printout MO Motion 10 5 TREND DATA PRINTOUT 10 6 NURSE CALL 10 6 In the ASCII mode the format of data displayed when a trend printout is requested is similar to that of the real time data The only differences are that TREND is displayed in the top row instead of the CRC XXXX software verification number and there is no Status column In the GRAPH mode the NPB 295 trend printout is a copy of the trend displayed on the NPB 295 s screen Readings are displayed in 2 second intervals The values on each row are an average for the 2 second period At the end of the printout an Output Complete line indicates that the transmission was successful If the Output Complete line is not present the data should be considered invalid NPB 295 VER
30. 2 Safety analyzer Must meet current AAMI ES1 1993 amp IEC 601 1 1998 specifications Serial interface cable EIA 232 cable optional 3 3 PERFORMANCE TESTS The battery charge procedure should be performed before monitor repairs whenever possible Note This section is written using Mallinckrodt factory set defaults If your institution has preconfigured custom defaults those values will be displayed Factory defaults can be restored using the configuration mode procedure described in paragraph 4 3 3 3 3 4 Battery Charge Perform the following procedure to fully charge the battery 1 Connect the monitor to an AC power source 2 Verify the monitor is off and that the AC Power Battery Charging indicator is lit 3 1 Section 3 Performance Verification on 3 Charge the battery for at least 14 hours in standby 3 3 2 Power up Performance The power up performance tests 3 3 2 1 through 3 3 2 2 verify the following monitor functions e Power On Self Test e Power On Defaults and Alarm Limit Ranges Power On Off Alarm Silence NELLCOR PURITAN BENNETT NPB 295 UV LIMITS TREND SETUP LIGHT 1 o e tenor Softkeys Contrast Adjust Adjust Down Up Figure 3 1 NPB 295 Controls 3 3 2 1 Power On Self Test 1 Connect the monitor to an AC power source and verify the AC Power Battery Charging indicator is lit 2 Do not connect any input cables to the monitor
31. 95 MEMBRANE PANEL CONNECTOR PBCSL 74HC245S D 15 0 CR22 AC_OK 1 M 1N914S 10 0K 1221 1214 0 0 3 3V C 2N3906S NNN 3 4 Q23 1 2N7002S Nr 1N914S VW 2 1299 UNS Q22 1300 R145 82 5 ACPWRLED g Figure 11 12 Display Interface Schematic Diagram 11 29 NELTCOR PURITAN BENNETT va NPB 290 MAIN BOTTOM SIDE ao Du Dala sez EJ PH gg EIE Pal 829 820 6 59 8 Vu VIE e Run 503 E o Mo nang EAN 5 88888 Ra Rag L 1071 TENTI lt ona 13 uu y Palla 1e legs us munanan BEBE 8 L L 5598 i n S gt UD gi uss ERA pL EEUU yp Wegen 7 LA LU ua sy Cees BENE Ree 72 DA 15 7 pe 852 871
32. Display PCB Removal Installation 6 11 UIF PCB Removal Installation 6 12 Alarm Speaker Removal Installation 6 1 INTRODUCTION The NPB 295 can be disassembled down to all major component parts including PCBs battery cables chassis enclosures The following tools are required small Phillips head screwdriver medium Phillips head screwdriver small blade screwdriver needle nose pliers or 1 4 inch socket torque wrench 10 inch pounds 1 13 Newton meters WARNING Before attempting to open or disassemble the NPB 295 disconnect the power cord from the NPB 295 Caution Observe ESD electrostatic discharge precautions when working within the unit Note Some spare parts have a business reply card attached When you receive these spare parts please fill out and return the card 6 2 PRIOR TO DISASSEMBLY 1 2 Turn the NPB 295 Off by pressing the Power On Standby button Disconnect the monitor from the AC power source 6 1 Section 6 Disassembly Guide 6 3 FUSE REPLACEMENT 1 Complete procedure in paragraph 6 2 2 Disconnect the power cord from the back of the monitor 3 Use a flat blade screwdriver to remove the fuse drawer from the Power Entry Module Press down on the tab in the center of the fuse drawer with the screwdriver until a click is heard Pull the drawer out as shown in Figure 6 1 Figure 6 1 Fuse Removal 4 Put new 5 x 20 mm slow blow 0 5 amp 250 volt fus
33. E SpO2 BPM PA Status 01 Jul 97 14 00 00 100 120 220 01 Jul 97 14 00 02 100 124 220 01 Jul 97 14 00 04 100 190 220 01 Jul 97 14 00 06 100 190 220 PH 01 Jul 97 14 00 08 100 190 220 PH 01 Jul 97 14 00 10 100 190 220 PH 01 Jul 97 14 00 12 100 190 220 PH 01 Jul 97 14 00 14 100 190 220 PH 01 Jul 97 14 00 16 100 190 220 PH LB 01 Jul 97 14 00 18 100 190 220 PH LB 01 Jul 97 14 00 20 100 190 220 PH LB 01 Jul 97 14 00 22 SD LB 01 Jul 97 14 00 24 SD LB 01 Jul 97 14 00 26 8 01 Jul 97 14 00 28 8 01 Jul 97 14 00 30 8 01 Jul 97 14 00 32 8 01 Jul 97 14 00 34 5 01 Jul 97 14 00 36 5 01 Jul 97 14 00 38 5 01 Jul 97 14 00 40 PS 01 Jul 97 14 00 42 5 01 Jul 97 14 00 44 PS NPB 295 VERSION 1 0 0 1 CRC XXXX SpO2 Limit 30 10055 PR Limit 100 180 bpm TIME 3002 BPM PA Status 01 Jul 97 14 00 46 5 NPB 25 VERSION 1 0 0 1 CRC XXXX SpO2 Limit 80 100 PR Limit 100 180 bpm TIME SpO2 BPM PA Status 01 Jul 97 14 00 48 79 59 220 SL PL LB 01 Jul 97 14 00 50 79 59 PS SL PL LB Figure 10 3 Real Time Printout Column Heading NPB 295 VERSION 1 0 0 1 CRC XXXX spOQ2Limi 30 100 PR Limit 100 180 bpm TIME Spo2 BPM PA Status The first two lines of the chart are the Column Heading Every 25 line is a Column Heading A column heading 15 also printed whenever a v
34. IF PCB 13 Install the clip over the J9 connector 14 Secure the ferrite on the ribbon cable from the Display PCB 15 Place the clamp over the ferrite assure that no wires are pinched and screw the clamp to the UIF PCB 16 Complete the procedure in paragraph 6 5 6 11 UIF PCB REMOVAL INSTALLATION Removal 1 Complete the procedures in paragraphs 6 2 and 6 4 2 Complete steps 2 through 4 of the procedure in paragraph 6 10 3 Disconnect the keypad ribbon cable from J8 of the UIF PCB Figure 6 8 J8 is a ZIF connector lift up on the outer shell until it clicks then remove the ribbon cable from the connector 4 Disconnect the speaker cable from J13 on the UIF PCB 5 Remove the four screws in the UIF PCB Figure 6 9 6 Remove the UIF PCB from the top case 6 11 Section 6 Disassembly Guide 6 12 Figure 6 9 UIF PCB Installation Caution When installing the UIF PCB hand tighten the five screws to a maximum of 4 inch pounds Over tightening could strip out the screw holes in the top case rendering it unusable 7 8 9 10 11 12 13 14 Place the UIF PCB in the top case Install the four screws in the UIF PCB Lift up on the outer shell of J8 on the UIF PCB until it clicks Insert the keypad ribbon cable into J8 of the UIF PCB Slide the outer shell of J8 down until it locks in place Connect the speaker cable to J13 of the UIF PCB Complete steps 9 through 11 of the procedure in para
35. IN ouT 2 G1CSHS 2 4 5 R123 100K 200K c116R114 O 1U BATT CHECK 2830 2 1 y MBRS330T3 2 Gg EN 3 3V 1216 TURN OFF AAN 1 Q15 2 39045 M C115 1 0U R120 VDD 20V 10 0K 9 129 y 10 0 lt 3 sv 1202 BTN_PRS_L U29 R103 10 0K ONBUTTON 10 49 9K Is e e 9dPnE voc aia 32 Kyo 2N3904S Critical at approx 5 68V R126 10 0K E 11 CLK 4 y CRIT_BATT L 1543 ormally HIGH active LOW VDD 74HC74S R108 o 6 81K D CLnii Q17 gt 2N3904S U37 LT1009S U28 R118 TP43 Low at approx 5 85V LM393S 4 99K 1220 7 e LOW_BATT L Normally HIGH active LOW R122 150K Figure 11 11 UIF PCB Power Supply Schematic Diagram B 035354 11 27 035354 R187 4 99K VDD 0 22 K 2 3906 D MOTNEERRA R140 4 99K O D ASLEDPR AA R141 4 99K e D BATLEDDONA R142 4 99 91 3 2 2N3906S D PSEEDDENACA 1266 1287 2 Q21 3 W 2 59065 Q19 1288 O 249 1 Q20 3 oo 2 249 2 2N3906S Q28 3 eo R133 249 MOTNLED CR24 312 1N4934 CCFLPWR CCFL inverter A1 TH VDD 3 SI9933 2
36. MAINTENANCE 2 1 CLEANING 2 1 Cleaning 2 2 Periodic Safety and Functional Checks 2 3 Battery Caution Do not immerse the NPB 295 or its accessories in liquid or clean with caustic or abrasive cleaners Do not spray or pour any liquid on the monitor or its accessories To clean the NPB 295 dampen a cloth with a commercial nonabrasive cleaner and wipe the exterior surfaces lightly Do not allow any liquids to come in contact with the power connector fuse holder or switches Do not allow any liquids to penetrate connectors or openings in the instrument cover Wipe sensor cables with a damp cloth For sensors follow each sensor s directions for use 2 2 PERIODIC SAFETY AND FUNCTIONAL CHECKS 2 3 BATTERY The NPB 295 requires no calibration The battery should be replaced every 2 years See Battery Replacement on 6 5 The following checks should be performed at least every 2 years by a qualified service technician 1 Inspect the exterior of the NPB 295 for damage 2 Inspect safety labels for legibility If the labels are not legible contact Mallinckrodt Technical Services Department or your local Mallinckrodt representative 3 Verify the unit performs properly as described in paragraph 3 3 4 Perform the electrical safety tests detailed in paragraph 3 4 If the unit fails these electrical safety tests do not attempt to repair the NPB 295 Contact Mallinckrodt Technical Services Department or your local Mallinckrodt represe
37. Parts 5 6 Troubleshooting Guide esee 5 7 Error Godes cn e nee Section 6 Disassembly Guide sse 6 1 Introduction 2 eed ei eter eget be ure te erede diat 6 2 Prior To Disassembiyx u u D a 6 3 Fuse Replacement 6 4 Monitor Disassembly se SH TH eee 6 5 Monitor Reassembly uy u eene 6 6 Battery Replacement ee ee ee nh khe 6 7 Power Entry Module Pem Removal Installation 6 8 Power Supply Removal Installation 6 9 Cooling Fan Removal Installafion sess 6 10 Display Pcb Removal Installation esses 6 11 Uif Pcb Removal Installation 6 12 Alarm Speaker Removal Installation oectiom 7 Spare Parts ug unn a uu in a 7 1 18110 61116 16 u uE EE Section 8 Packing For Shipment nh vi 1 1 1 1 1 1 1 3 2 1 2 1 2 1 2 1 3 1 3 1 3 1 3 9 4 1 4 1 4 1 4 2 5 1 5 1 5 1 5 1 5 1 5 1 5 2 5 7 6 1 6 1 6 1 6 2 6 3 6 4 6 5 6 6 6 7 6 9 6 10 6 11 6 13 7 1 7 1 8 1 11 Table of Contents 11 10 8 1 General Instructions 8 1 8 2 Repacking In Original Carton 8 1 8 3 Repacking I
38. Q NELLCOR SERVICE MANUAL NPB 295 Pulse Oximeter Caution Federal law U S restricts this device to sale by or on the order of a physician To contact Mallinckrodt Inc representative In the United States call 1 800 635 5267 outside the United States call your local Mallinckrodt representative 2002 Mallinckrodt Incorporated All rights reserved 061097C 1202 0123 Nellcor Puritan Bennett Inc 4280 Hacienda Drive Pleasanton CA 94588 USA Telephone Toll Free 1 800 NELLCOR Mallinckrodt Europe BV Hambakenwetering 1 5231 DD s Hertogenbosch The Netherlands Telephone 31 73 648 5200 Nellcor Puritan Bennett Inc is a wholly owned subsidiary of Mallinckrodt Inc To obtain information about a warranty if any for this product contact Mallinckrodt Technical Services or your local Mallinckrodt representative Purchase of this instrument confers no express or implied license under any Mallinckrodt patent to use the instrument with any sensor that is not manufactured or licensed by Mallinckrodt Nellcor Puritan Bennett Nellcor Durasensor and Oxisensor I are trademarks of Mallinckrodt Incorporated Covered by one or more of the following U S Patents and foreign equivalents 4 621 643 4 653 498 4 700 708 4 770 179 4 869 254 4 653 498 5 078 136 5 351 685 5 368 026 5 533 507 and 5 662 106 TABLE OF CONTENTS List of Figures List of Tables Table Of Conten S
39. SION 1 0 0 1 CRC XXXX SpO2Limi 30 1005 PR Limit 100 180 bpm TIME Spo2 PR bpm PA 22 Nov 97 14 00 05 100 120 150 22 Nov 97 14 00 10 100 121 154 22 Nov 97 14 00 15 100 120 150 Output Complete Figure 10 4 Trend Data Printout An RS 232 Nurse Call signal pins 5 and 11 can be obtained by connecting to the data port It is in the form of a positive or negative voltage chosen by the user This function is only available when the instrument is operating on AC power The RS 232 Nurse Call will be disabled when the unit is operating on battery power Section 10 Serial Port Interface Protocol The remote location will be signaled anytime there is an audible alarm If the audible alarm has been set Off or silenced the Nurse Call function is also turned off Pin 11 on the data port is the RS 232 Nurse Call signal and pin 5 is ground see Figure 10 1 When there is no audible alarm the voltage between pins 10 and 11 will be a 5 volt DC to 12 volts DC or 5 volts DC to 12 volts DC depending on the option chosen via the softkeys either NCALL or NCALL Whenever there is in an audible alarm the output between pins 5 and 11 will reverse polarity An internal Nurse Call relay pins 7 8 and 15 provides dry contacts that can be used to signal a remote alarm These contacts can be used whether the instrument is operating on AC or on its internal battery Pin 15 is common pin 7 is N O and pin 8 is N C Table 10 3 shows the state of
40. TERY REPLACEMENT Removal 1 Follow the procedure in paragraphs 6 2 and 6 4 2 Remove the two screws from the battery bracket and lift the battery out of the bottom case as shown in Figure 6 4 3 Be sure to note the polarity of the leads Use needle nose pliers to disconnect the leads from the battery Note The lead acid battery is recyclable Do not dispose of the battery by placing it in the regular trash Dispose of properly or return to Mallinckrodt Technical Services for disposal Figure 6 4 NPB 295 Battery Installation 4 Connect the leads to the battery e Red wire connects to the positive terminal e Black wire connects to the negative terminal 3 Insert the new battery into the bottom case with the negative terminal towards the outside of the monitor 6 Install the bracket and grounding lead with the two screws 7 Complete the procedure in paragraph 6 5 8 Turn the monitor on and verify proper operation 6 5 Section 6 Disassembly Guide 6 7 POWER ENTRY MODULE PEM REMOVAL INSTALLATION 6 6 Removal 1 Complete the procedures in paragraphs 6 2 and 6 4 2 Push the top of the Power Entry Module PEM in from the outside of the case and lift up 3 Use needle nose pliers to disconnect the leads from the PEM see Figure 6 5 Equipotential lug Figure 6 5 Power Entry Module Installation 4 Refer to Table 6 1 and connect the leads to the PEM 5 Install the PEM in
41. able at the patient end of the cable 4 The equipotential terminal is not connected to ground 5 All functional earth terminals are not connected to ground 6 The analyzer leakage current must not exceed the values shown in Table 3 5 Table 3 5 Patient Leakage Current Test Configurations Mains Voltage on the Applied Part AC LINE NEUTRAL IEC 601 1 AAMI ANSI POLARITY LINE ES1 STANDARD SECTION 4 POWER ON SETTINGS AND SERVICE FUNCTIONS 4 1 Introduction 4 2 Power on Settings 4 3 Service Functions 4 1 INTRODUCTION This section discusses how to reconfigure power on default values and access the service functions 4 2 POWER ON SETTINGS The following paragraphs describe how to change power on default settings Through the use of softkeys shown in Figure 1 2 the user can change e alarm limits e type of display e 890 rate e time and date e trends to view A decimal point is added to the right of a display when the alarm limit for that display has been changed to a value that is not a power on default value If the new value is saved as a power on default value the decimal point will be removed By using the service functions changes can be saved as power on default values Some values cannot be saved as power on default values A SpO2 Low limit less than 80 will not be saved as a power on default Audible Alarm Off will not be accepted as a power on default An attempt to save either of these values as default will
42. acking in a Different Carton To ship the monitor for any reason follow the instructions in this section 8 1 GENERAL INSTRUCTIONS Pack the monitor carefully Failure to follow the instructions in this section may result in loss or damage not covered by any applicable Mallinckrodt warranty If the original shipping carton is not available use another suitable carton North American customers may call Mallinckrodt Technical Services Department to obtain a shipping carton Before shipping the NPB 295 contact Mallinckrodt Technical Services Department for a returned goods authorization RGA number Mark the shipping carton and any shipping documents with the RGA number European customers not using RGA numbers should return the product with a detailed written description of the problem Return the NPB 295 by any shipping method that provides proof of delivery 8 2 REPACKING IN ORIGINAL CARTON If available use the original carton and packing materials Pack the monitor as follows 1 Place the monitor and if necessary accessory items in original packaging 8 1 Section 8 Packing for Shipment Figure 8 1 Repacking the NPB 295 2 Place in shipping carton and seal carton with packaging tape 3 Label carton with shipping address return address and RGA number if applicable 8 2 Section 8 Packing for Shipment 8 3 REPACKING IN A DIFFERENT CARTON If the original carton is not available use the foll
43. alue of the Column Heading is changed There are three Column Heading lines shown in Figure 10 2 Using the top row as the starting point there are 25 lines before the second Column Heading is printed The third Column Heading was printed because the SpO2 limits changed from 30 100 to 80 100 Data Source NPB 295 VERSION 1 0 0 1 CRCXXXX 5902 Limit 30 100 PR Limit 100 180 bpm SpO2 BPM PA Status Data in the highlighted box above represents the source of the printout or display in this case the NPB 295 Software Revision Level NPB 295 VERSION 1 0 0 1 CRC XXXX spo2 Limit 30 100 PR Limit 100 180 bpm TIME Status The next data field tells the user the software level Version 2 0 0 0 and a software verification number CRC XXXX Neither of these numbers should change during normal operation The numbers will change if the monitor is serviced and receives a software upgrade Section 10 Serial Port Interface Protocol Alarm Limits NPB 295 VERSION 1 0 0 1 CRC XXXX 5502 Limit 30 100 PR Limit 100 180 bpm TIME SpO2 BPM The last data field in the top line indicates the high and the low alarm limits for SpO2 and for the pulse rate PR In the example above the low alarm limit for SpO2 is 30 and the high alarm limit is 100 Pulse Rate alarm limits are low 100 bpm and high 180 bpm Column Headings NPB 295 VERSIONI001 CRC XXXX spo2 Limit 30 100 PR Limit 100 180 bpm mp Ss Actual column head
44. ation and pulse rate are displayed digitally along with a plethysmographic waveform or a 10 segment blip bar that indicates pulse intensity This monitor is intended for use in hospital and hospital type facilities during intra hospital transport and in home environments Through the use of the four softkeys the operator can access trend information select an alarm limit to be changed choose the language to be used adjust the internal time clock and change communications protocol The NPB 295 can operate on AC power or on an internal battery The controls and indicators for the NPB 295 are illustrated in Figures 1 1 through 1 3 L NELLCOR PURITAN BENNETT NPB 29 5 02 1 00 110 LIMITS TREND SETUP LIGHT 17 16 15 14 13 12 11 10 1 SpO2 Sensor Port 10 Adjust Up Button 2 Low Battery Indicator 11 Adjust Down Button 3 Power On Off Button 12 Contrast Button 4 AC Battery Charging Indicator 13 Softkeys 5 Waveform Display 14 Menu Bar 6 SpO2 Indicator 15 Motion Indicator 7 Pulse Beats Per Minute display 16 Pulse Search Indicator 8 Alarm Silence Indicator 17 Speaker 9 Alarm Silence Button Figure 1 1 NPB 295 Front Panel 1 1 Section 1 Introduction Figure 1 2 illustrates the various functions that are available through the use of the softkeys and how to access them A complete explanation of the keys is provided in the NPB 295 operator
45. ce Function Softkeys 4 2 Section 4 Power On Settings and Service Functions Figure 4 2 can be used as a quick reference showing how to reach different softkey functions Items reached through the Param softkey can be accessed during normal operation Functions provided by the Print and Next softkeys cannot be accessed when a sensor cable is connected to the instrument Each of the various functions is described in the text to follow G Go EO DO Paragraph 4 3 2 1 Paragraph 4 3 2 1 Paragraph 4 3 2 2 Paragraph 4 3 2 3 and 4 3 2 4 Contrast Figure 4 2 Service Function Softkey Map 4 3 2 1 Exit amp Next Softkeys 4 3 2 2 Param NEXT There are not enough buttons to display all of the options that are available at some levels of the menu Pressing the Next button allows you to view additional options available at a given menu level EXIT To back up one menu level press the Exit button The service functions can be exited by repeatedly pressing the Exit button When the Param softkey is pressed the function of the softkeys changes as shown in figure 4 3 These options can be accessed without disconnecting the sensor cable from the instrument BS NELLCOR PURITAN BENNETT NPB 295 9 1 e d e e oO Figure 4 3 Param Softkeys 4 3 Section 4 Power On Settings and Service Functions 4 3 2 3 Print 4 4 RESET The Reset button is used to return
46. d in Figure 10 1 The conductive shell is used as earth ground An AMP connector is used to connect to the data port Use AMP connector AMP P N 747538 1 ferrule AMP P N 1 747579 2 and compatible pins AMP P N 66570 2 9 10 11 12 13 14 15 1 2 3 4 5 6 7 8 Figure 10 2 Data Port Pin Layout When building an RS 422 cable a resistor 120 ohm 1 4 watt 5 must be added between pins and 9 of the cable The end of the cable with the resistor added must be plugged into the NPB 295 This resistor is not necessary for RS 232 cables The serial cable must be shielded example Beldon P N 9616 Connectors at both ends of the serial cable must have the shield terminated to the full 360 degrees of the connector s metal shell If rough handling or sharp bends in the cable is anticipated use a braided shield 10 4 REAL TIME PRINTOUT When a real time display or printout is being transmitted to a printer or PC a new line of data is printed every 2 seconds Every 25 line is a Column Heading line A column heading line is also printed any time a value in the column heading line is changed A real time printout is shown below in Figure 10 2 Note Ifthe data output stops transmitting turn the power off and back on again or if connected to a PC send an XON Ctrl q to resume transmission Section 10 Serial Port Interface Protocol 10 4 1 10 4 NPB 295 VERSION 1 0 0 1 CRC XXXX SpO2 Limit 30 10055 PR Limit 100 180 bpm TIM
47. determined with Oxisensor II N 25 sensors In addition the neonatal accuracy specification is neonatal blood on oximetry measurements Pulse Rate optically derived 20 250 bpm 3 bpm Accuracies are expressed as plus or minus X bpm across the display range This variation equals plus or minus Standard Deviation which encompasses 68 of the population 9 3 Blank Page SECTION 10 SERIAL PORT INTERFACE PROTOCOL 10 1 Introduction 10 2 Configuring the Data Port 10 3 Connecting to the Data Port 10 4 Real Time Printout 10 5 Trend Data Printout 10 6 Nurse Call 10 7 Analog Output 10 1 INTRODUCTION When connected to the data port on the back of the NPB 295 printouts can be obtained or communication of patient data can be sent to a Nellcor Oxinet II Monitoring System Analog signals representing SpO2 Pulse Rate and Pulse Amplitude are provided by the data port A nurse call function is available from the data port Each of these is discussed in more detail in the paragraphs that follow 10 2 CONFIGURING THE DATA PORT Items pertaining to the data port can be adjusted by following the softkey map in Figure 10 1 For a complete description of the softkeys refer to the operator s manual SPO2 Normal 95 Display Mode BPM 65 Adjust baud rate Select and protocol Language c c Norm or Volt 1 Volt Norm or Step Figure 10 1 Data Port Softkeys The COMM key is used to select communication
48. e The fan is disabled if the unit is running on battery power 11 6 2 Battery Circuits 11 7 BATTERY Two circuits are included in this section of the Power Supply PCB One circuit is used to charge the battery and the other circuit provides battery protection Charging Circuit The Power Supply will charge the battery any time the NPB 295 is connected to AC power even if the monitor is not turned on The voltage applied to the battery is 6 8 0 15 volts DC and is current limited to 400 80 mA Battery voltage is checked periodically by the processor A signal from the processor turns the charging circuit off to allow this measurement to be taken If the processor determines the battery voltage is below 5 85 0 1 volts DC a low battery alarm is declared Battery Protection Two types of battery protection are provided by the Power Supply protection for the battery and protection from the battery Switch SW2 is a resettable component that protects the battery SW2 opens and turns the charging circuit off if the temperature of the battery rises above 50 C If the output of the battery exceeds 2 0 amps F3 opens F3 protects the battery from a short to ground of the battery output Protection from the battery is provided for the event the battery is connected backwards Components on the UIF PCB and the Power Supply block and limit the voltage to provide protection to circuits in the instrument A lead acid battery is used
49. e NPB 295 and turn the NPB 295 on 2 Place the SRC 2 in the RCAL 63 LOCAL mode 3 Set the SRC 2 as indicated in Table 3 1 Note An indicates values that produce an alarm Press the Alarm Silence button to silence the alarm Table 3 1 Dynamic Operating Range SRC 2 Settings NPB 295 Indications HIGH2 LOW 79 83 35 41 HIGHI HIGH 79 83 109 115 200 LOW LOW 79 83 198 204 201 LOW HIGH 79 83 198 204 Note Allow the monitor several seconds to stabilize the readings 4 Verify the NPB 295 readings are within the indicated tolerances Note The Nurse Call tests must be performed with the instrument operating on AC power 1 Connect the negative lead of a voltmeter to pin 5 and positive to pin 11 of the data port on the back of the instrument Figure A 2 in Appendix Ensure that the audible alarm is not silenced or turned off 2 Set the SRC 2 to create an alarm condition 3 Verify an output voltage at pins 5 and 11 between 5 and 12 volts DC 4 Press the Alarm Silence button With no active audible alarm the output voltage at pins 5 and 11 must be between 5 and 12 volts DC 5 With the instrument in an alarm condition use a DVM to verify there is no continuity between pins 8 and 15 and that there is continuity between pins 7 and 15 3 7 Section 3 Performance Verification 6 3 3 3 1 6 Analog Output Note Note 9 Adjust the alarm limits so that there is no alarm condi
50. e resets Loss of settings Institutional default values lost and reset to factory default values Settings lost settings that were different from power on default values have been lost Time clock lost Internal communications error Check the voltage selector switch Charge battery for 14 hours Leads of battery reversed refer to paragraph 6 5 Replace battery Cycle power Replace UIF PCB if code 5 repeatedly occurs 3 Replace Power Supply 1 Cycle power to clear error Check voltage selector switch for proper setting Replace UIF PCB Cycle power Replace UIF PCB if code repeatedly occurs Cycle power Check and reset settings if necessary Check battery Replace UIF PCB if code repeatedly occurs Cycle power Replace UIF PCB if code 80 repeatedly occurs Cycle power Check and reset settings if necessary Check battery Replace UIF PCB if code repeatedly occurs Reset time clock Battery power was lost check the battery Replace the Power Supply Cycle power Replace UIF PCB if code repeatedly occurs 5 7 Blank Page SECTION 6 DISASSEMBLY GUIDE 6 1 6 2 6 3 6 4 6 5 6 6 6 7 6 8 6 9 Introduction Prior to Disassembly Fuse Replacement Monitor Disassembly Monitor Reassembly Battery Replacement Power Entry Module Removal Installation Power Supply Removal Installation Cooling Fan Removal Installation 6 10
51. ed every 2 seconds As an example an instrument that is used 6 hours a week would take approximately 4 weeks to fill its memory The 24 hours of stored trend data is available for downloading to Score software for 45 days There are no limitations for displaying or printing data Note The two letter codes and the symbols that occur in the printout are described in Table 10 3 NELLCOR PURITAN BENNETT NPB 295 Sepp D 00 6 Figure 4 4 Print Softkeys Section 4 Power On Settings and Service Functions TREND A Trend printout will include all data recorded for up to 24 hours of monitoring since the last Delete Trends was performed A new trend point is recorded every 2 seconds Figure 4 5 is an example of a Trend printout NPB 295 Version 1 0 0 000 TREND SpO2 Limit 30 100 PR Limit 100 180 bpm TIME SpO2 PR bpm PA 01 Jul 97 14 00 00 100 120 220 01 Jul 97 14 00 05 100 124 220 01 Jul 97 14 00 10 100 190 220 01 Jul 97 14 00 15 100 190 220 01 Jul 97 18 00 43 01 Jul 97 18 00 48 NPB 295 Version 1 0 0 000 Trend SpO2 Limit 80 100 PR Limit 60 180 bpm Time SpO2 PR bpm PA 01 Jul 97 18 00 53 01 Jul 97 18 00 58 01 Jul 97 18 01 03 98 100 140 01 Jul 97 18 01 08 98 181 190 01 Jul 97 18 01 13 99 122 232 Output Complete Figure 4 5 Trend Printout The first two lines are the column heading lines The first line includes information about the
52. ee ee 6 2 Figure 6 2 NPB 295 Corner SCreWS 6 3 Figure 6 3 Separating Case Hahyes 5 ke ee 6 4 Figure 6 4 NPB 295 Batter 6 5 Figure 6 5 Power Entry Module 6 6 Figure 6 6 Power Supp 6 7 Figure 6 7 Cooling Fan 6 9 Figure 6 8 Display PCB teats Aia 6 10 Figufe 6 9 UIF PCB EG RE 6 12 Figure 6 10 Alarm Speaker u 6 13 Figure 7 1 NPB 295 Expanded View 7 2 Figure 8 1 Repacking the 28 295 6 2 Figure 10 1 Data Port SoftkeyS 10 1 Figure 10 2 Data Port Pin Layout 10 3 Figure 10 3 Real Time Printout 10 4 Figure 10 4 Trend Data Printout ee ee ee AR ee ee nn 10 6 Figure 11 1 Oxyhemoglobin Dissociation Curve 11 2 Figure 11 2 NPB 295 Functional Block Diagram 11 3 Figure 11 3 UIF PCB Front End Red IR Schematic Diagram 11 11 Figure 11 4 Analog Front End Schematic Diagram 11 13 Figure 11 5 Front End Power Supply Schematic Diagram
53. er s interface includes the front panel display and the keypad By pressing any of nine keys on the keypad the operator can access different functions of the NPB 295 The 331 will recognize the keystroke and make the appropriate change to the monitor display to be viewed by the operator The monitor uses any changes made by the operator until it is turned off Default values will be restored when the unit is powered on again Patient data is stored by the NPB 295 and can be downloaded to a printer through the data port provided on the back of the monitor An in depth discussion of the data port is covered in the Appendix of this manual PIC The PIC controls the SpO2 function and communicates the data to the 331 A pulse width modulator PWM function built into the processor controls the SpO2 function PWM signals are sent to control the intensity of the LEDs in the sensor and to control the gain of the amplifiers receiving the return signals from the photodetector in the sensor Analog signals are received from the SpO2 circuit on the UIF PCB An A D function in the PIC converts these signals to digital values for SpO2 and heart rate The values are sent to the 331 to be displayed and stored 11 6 3 Sensor Output LED Control 11 6 The SpO2 analog circuitry provides control of the red and IR LEDs such that the received signals are within the dynamic range of the input amplifier Because excessive current to the LEDs will induce changes in t
54. es in the drawer and reinsert the drawer in the power entry module 6 2 Section 6 Disassembly Guide 6 4 MONITOR DISASSEMBLY Caution Observe ESD electrostatic discharge precautions when disassembling and reassembling the NPB 295 and when handling any of the components of the NPB 295 1 Set the NPB 295 upside down as shown in Figure 6 2 Corner screws Figure 6 2 NPB 295 Corner Screws 2 Remove the four corner screws 3 Turn the unit upright 4 Separate the top case from the bottom case of the monitor being careful not to stress the wire harnesses between the cases 2 Place the two halves of the monitor on the table as shown in Figure 6 3 6 Disconnect the Power Supply from J6 on the UIF PCB 6 3 Section 6 Disassembly Guide J6 Power supply harness Figure 6 3 Separating Case Halves 6 5 MONITOR REASSEMBLY 1 Place the two halves of the monitor on the table as shown in Figure 6 3 2 Connect the Power Supply to J6 on the UIF PCB 3 Place the top case over the bottom case being careful to align the lens Power Entry Module and the fan with the slots in the top case Caution When reassembling the NPB 295 tighten the screws that hold the cases together to a maximum of 10 inch pounds Over tightening could strip out the screw holes in the top case rendering it unusable 4 Install the four corner screws 6 4 Section 6 Disassembly Guide 6 6 BAT
55. ese LEDs indicate AC power available low battery pulse search alarm silence and noise motion 11 10 SCHEMATIC DIAGRAMS The following part locator diagrams and schematics are included in this section Figure 11 3 Figure 11 4 Figure 11 5 Figure 11 6 Figure 11 7 Figure 11 8 Figure 11 9 Figure 11 10 Figure 11 11 Figure 11 12 Figure 11 13 Figure 11 14 Figure 11 15 UIF PCB Front End Red IR Schematic Diagram Analog Front End Schematic Diagram Front End Power Supply Schematic Diagram SIP SOP Interface Schematic Diagram Data Port Drivers Schematic Diagram CPU Core Schematic Diagram A CPU Memory Schematic Diagram B Contrast and Sound Schematic Diagram A UIF PCB Power Supply Schematic Diagram B Display Interface Schematic Diagram UIF PCB Parts Locator Diagram Power Supply Schematic Diagram Power Supply Parts Locator Diagram 318 2N3906S 2 2N3906S Q10 3 129 R21 10 24 9K u58 LP311D u10Y TLC339CD 14 e uso 1 532 LT1013S x DG2013 13 0 1153 13 DG201S 10V U10V TLC339CD 10V 694 vss S 2546535
56. g unit In order to achieve a specified level of oxygen saturation measurement and to still use a standard type combined PIC and A D converter the DC offset is subtracted from each signal The DC offsets are subtracted by using an analog switch to set the mean signal value to the mean of the range of the A D converter whenever necessary The AC modulation is then superimposed upon that DC level This is also known as AC ranging Each AC signal is subsequently amplified such that its peak to peak values span one fifth of the range of the A D converter The amplified AC signals are then filtered to remove the residual effects of the PWM modulations and finally are input to the PIC The combined AC and DC signals for both IR and red signals are separately input to the A D converter 11 8 7 Real Time Clock RTC Real time is tracked by the NPB 295 As long as battery power or AC power is available the instrument will keep time If the battery is removed the time clock will have to be reset The LCD will display the time and date for the data period highlighted by the cursor on a trend display A time stamp 15 printed for each line of data on 8 printout Real time data 15 displayed and printed as Day Month Year Hours Minutes and Seconds Section 11 Technical Supplement 11 8 8 Patient Data Storage Whenever the NPB 295 is turned on it stores a data point in memory every 2 seconds regardless of whether the NPB 295 is monitor
57. graph 6 10 Complete the procedure in paragraph 6 5 Section 6 Disassembly Guide 6 12 ALARM SPEAKER REMOVAL INSTALLATION Removal 1 Complete the procedures in paragraphs 6 2 and 6 4 2 Disconnect the speaker wire harness from J13 on the UIF PCB see Figure 6 10 3 Pull the speaker holding clip towards the center of the monitor and lift the speaker from the top housing Holding Clip Connect speaker wires to J13 connector Figure 6 10 Alarm Speaker Installation 4 Slide the speaker into the plastic holding clip provided in the top housing 5 Connect speaker wire harness to J13 on the UIF PCB 6 Complete the procedure in paragraph 6 5 Blank Page SECTION 7 SPARE PARTS 7 1 7 1 Introduction INTRODUCTION Spare parts along with part numbers are shown below Item numbers correspond to the callout numbers in Figure 7 1 Table 7 1 Parts List tem Description Irape L6 Power Supply leg s By nog L Batten Bracket o Tatar Speaker aor stow Je RuberFstiethom ADORO E Power Cord not shown U S 071505 International 901862 U K 901863 saag Jm GCkMemigKikgerhow 0564 7 1 Section 7 Spare Parts Figure 7 1 shows the NPB 295 expanded view with numbers relating to the spare parts list 295 Expanded View Figure 7 1 NPB 7 2 SECTION 8 PACKING FOR SHIPMENT 8 1 General Instructions 8 2 Repacking in Original Carton 8 3 Rep
58. h 1 TH 4 x J5 19 2 5 1 GND2 CXA L10 Turn off control ASLED BATLED PSLED BK LT ONL RESETL DSPLRDL VEE 12 TAHC32S U4O 1319 74HC32S c R wWL e 1 DSPLYCSL 11 3 121 16V 698 R201 10 1 Z5U DSPL DSPLYCSL FONTSEL TAHC32S BDO 1 3 WVL 5 7 9 X13 BD2 13 BD4 15 BD6 17 19 D 15 O D N T Og 33333333 o Nj oo MEIN INIWAN O 1 BDSPLYCSU e Z4HC245S BDSPLYCSL x CON_IDC20 TO LCD DISPLAY BD 7 0 CON 4L O98 ONBU ON SorrkEv2 L18 OO SOFTKEY AAA 5601 56018 17 rra 8801 SOFTKEY1 ACPWRLED 2 BATLED 3 4 PSLED MOTNLEDS 6 L15 B601 SOFTKEYS rd 9 5 10 11 AANA Beoh CNTRST 12 DOWN BIN Feo B601 15 SEN 17 1 21 ALRMSIL OOOO BS01 13 14 CR34 Kg VC1206 2 5 6V CON FLEX17 16 ASLED L1G h CR33 bid VC1206 5 6V UP_BTN DIR 2
59. harness to the handle side of the case 6 Complete procedure 6 5 6 9 Section 6 Disassembly Guide 6 10 DISPLAY PCB REMOVAL INSTALLATION Removal Caution The LCD panel contains toxic chemicals Do not ingest chemicals from a broken LCD panel 1 2 3 Complete the procedures in paragraphs 6 2 and 6 4 Disconnect the CCFL harness two white wires from J5 of the UIF PCB Use a small blade screwdriver to pry the clip from either edge of J9 then disconnect the Display PCB ribbon cable from the connector Remove the screw holding the clamp to the ferrite on the ribbon cable of the Display PCB Separate the adhesive connection of the double sided tape and lift the Display PCB up to remove it from the top case Remove the used double sided tape Speaker wires to J13 f on the UIF PCB Keypad ribbon cable CCFL wi to J8 on UIF PCB wires to 5 on the UIF PCB Display ribbon cable to J9 on UIF PCB Figure 6 8 Display PCB Section 6 Disassembly Guide Installation Te Install new double sided tape as shown in Figure 6 8 8 Slide the Display PCB into the grooves in the top case 9 Check to make sure the Display PCB is firmly seated in the top case 10 Apply pressure between the top case and the display PCB to make good contact with the double sided tape 11 Connect the wire harness with two white wires to J5 of the UIF PCB 12 Connect the Display PCB ribbon cable to J9 of the U
60. he functions shown in Figure 4 9 E NELLCOR PURITAN BENNETT NPB 295 L e Au LDOWNLD ALARMS NEXT EXIT e e e e O Figure 4 9 Next Softkeys DOWNLD When Downld is selected the instrument will display the revision of the Boot Code To exit Downld cycle power to the instrument by pressing the Power On Off button Consult the DFU provided with any downloads or upgrades to the FLASH firmware ALARMS Pressing the Alarms softkey can change characteristics of the audible alarm When the Alarms softkey is pressed the softkey s functions change as shown in Figure 4 10 NELLCOR PURITAN BENNETT NPB 295 e 2 3 e L 1 E e E Figure 4 10 Alarms Softkeys SELECT The Sel softkey 1s used to select what function of the audible alarm is going to be changed A box can be cycled between two choices Allow Off and Off Reminder When Allow Off is selected a choice is given between allowing an audible alarm Off or disabling the audible alarm Off Pressing the Up or Down arrow key cycles between Yes and No If Yes is selected the operator has the option of selecting Audible Alarm Off If No is selected the operator is not given the option of selecting Audible Alarm Off as an alarm silence duration choice If the audible alarm is set to Off a reminder tone can be sounded every 3 minutes to notify the user of this conditio
61. he electrical safety analyzer patient leakage input lead to all pins of the monitor s patient cable at the end of the cable 4 The equipotential terminal is not connected to ground 5 All functional earth terminals are not connected to ground 6 Measure the leakage current between the patient connector and earth 3 11 Section 3 Performance Verification Table 3 4 Patient Leakage Current Limits AC LINE NEUTRAL IEC 601 1 AAMI ANSI POLARITY LINE ES1 STANDARD 3 4 2 4 Patient Isolation Risk Current Mains Voltage on the Applied Part This test is in compliance with AAMI Standard ESI patient isolation risk current sink current and IEC 601 1 patient leakage current Patient Leakage Current is the measured value in a patient connection if mains voltage is connected to that patient connection The applied voltage for AAMI ANSI is 120 volts AC 60 Hz and for IEC 601 1 the applied voltage is 264 volts AC 50 to 60 Hz Warning AC mains voltage will be present on the patient cable terminals during this test Exercise caution to avoid electrical shock hazard 1 Configure the electrical safety analyzer as follows Function Patient Leakage Mains on Applied Part Range uA 2 Connect the monitor AC plug to the electrical safety analyzer as recommended by the operating instructions for patient sink leakage current 3 Connect the electrical safety analyzer patient leakage input lead to all connectors in the patient c
62. heir spectral output it is sometimes necessary to increase the received signal channel gain To that point the CPU controls both the currents to the LEDs and the amplification in the signal channel At initialization of transmission the LEDs intensity level is based on previous running conditions and the transmission intensity is adjusted until the received signals match the range of the A D converter If the LEDs reach maximum output without the necessary signal strength the PWMs will increase the channel gain The PWM lines will select either a change in the LED current or signal gain but will not do both simultaneously The LED drive circuit switches between red and IR transmission and disables both for a time between transmissions in order to provide a no transmission reference To prevent excessive heat build up and prolong battery life each LED is on for only a small portion of the duty cycle Also the frequency of switching 1s well above that of motion artifact and not a harmonic of known AC transmissions The IR transmission alone and the red transmission alone will each be on for about one fifth of the duty cycle this cycle is controlled by the PIC 11 8 4 Signal Gain Section 11 Technical Supplement Input Conditioning Input to the SpO2 analog circuit is the current output of the sensor photodiode In order to condition the signal current it is necessary to convert the current to voltage Because the IR and red signals
63. ient isolation from mains is also provided by the power supply AC power from the PEM is passed through a step down transformer T2 which has two primary and two secondary windings If switch SW1 on the back of the monitor is in the 120 volts AC position the primary windings are in parallel The primary windings are in series if SW1 is in the 240 volts AC position Each secondary winding is fused with a 2 0 amp fuse F1 and F2 If a short circuit should occur in the DC circuitry these fuses prevent the transformer from overheating The output of the transformer varies depending on load and input Voltage measured between the outlet of a secondary winding and ground can be from 6 to 20 volts AC High frequency noise from the AC line and from the UIF PCB is filtered by C6 and C8 before passing through the bridge rectifier Two outputs from the bridge rectifier are used in the NPB 295 The fan control circuit uses the negative output The positive output is the Main DC ranging from 7 to 18 volts DC This positive voltage is used for the battery circuit and to power the UIF PCB Section 11 Technical Supplement 11 6 1 Fan Control A fan control circuit on the Power Supply PCB is used to control the temperature inside the case of the NPB 295 The temperature sensor used in this circuit is U3 U3 turns on the cooling fan if the temperature inside the case gets above approximately 31 C The cooling fan runs on approximately 15 volts DC Not
64. igh alarm limit for SpO2 will indicate an alarm limit of 100 inside a box Figure 3 3 r EL NELLCOR PURITAN BENNETT NPB 295 ALARM LIMITS apm 1 00 O SCH 100 LOWER 85 40 SELECT Figure 3 3 Adjusting SpO2 Upper Alarm Limit Press the Limits softkey Press and hold the Down Arrow button Verify the boxed number for SpO2 upper alarm limit reduces to a minimum of 85 A decimal point in the display indicates that the alarm limits have been changed from factory default values Press the SELECT softkey Verify the monitor emits a single beep and the box moves to the SpO2 lower alarm limit of 85 r EU NELLCOR PURITAN BENNETT NPB 295 o ALARM LIMITS SP02 wM 2400 UPPER 100 85 Figure 3 4 Adjusting 55 SpO Lower Alarm Limit Press and hold the Down Arrow button and verify the SpO2 lower alarm limit display reduces to a minimum of 20 Press and hold the Up Arrow button and verify the SpO2 lower alarm limit display cannot be raised past the upper alarm limit setting of 85 Press the Exit button 3 3 Section 3 Performance Verification 3 4 f 10 11 12 13 14 15 Press the Limits softkey then press the SELECT softkey two times Verify the monitor emits a beep after each keystroke The Pulse upper alarm limit should be 170 and should be boxed r EL
65. in the NPB 295 It is rated at 6 volts DC 4 amphours When new and fully charged the battery will operate the monitor for 8 hours under the following conditions no alarms no analog or serial output devices attached and no backlight The battery can withstand 400 charge discharge cycles Recharging the battery to full capacity will take 14 hours in standby or 18 hours if the instrument is being used Changeover from AC to battery power will not interrupt the normal monitoring operation of the NPB 295 However when the unit is running on battery power the cooling fan data port RS 232 Nurse Call and LCD backlight will be turned off The 331 CPU on the UIF PCB monitors the charge level of the battery If the voltage of the battery falls below 5 85 0 1 volts DC a low battery alarm is declared The instrument will continue monitoring and alarming for 15 minutes then power down This 15 minute alarm and power down sequence can be repeated by turning the unit back on provided the battery voltage remains above the critical level Section 11 Technical Supplement Battery voltage is considered critical when it decreases to 5 67 0 1 volts DC If the instrument is turned on and battery voltage is at the critical level an error code is displayed and the instrument will not monitor the patient The instrument will run for 15 minutes with the error code displayed and then power down Both conditions can be corrected by plugging the unit in
66. ing a patient or not Up to 50 alarm limit changes will also be stored in trend data The NPB 295 can store up to 24 hours of trend data The 24 hours of stored trend data is available for downloading to Score software for 45 days There are no limitations for displaying or printing data Caution Changing alarm limit settings uses up trend memory space Change alarm limits only as needed Note Note Trend memory always contains the MOST RECENT 24 hours of data with newly collected data over writing the oldest data on a rolling basis The NPB 295 continues to record data points as long as the monitor is powered on with blank data points collected if no sensor is connected to the monitor or patient Blank data will over write older patient data if the memory becomes full Therefore if you want to save old patient data it is important that you turn your monitor off when you are not monitoring a patient and that you download the trend memory using Score software before it fills up and over writes the old data with new data or blank data When using Score software use the latest version Contact Mallinckrodt s Technical Services Department or your local Mallinckrodt representative to determine the latest version of Score software If battery power is disconnected or depleted trend data and user settings will be lost All data is stored with error detection coding If data stored in memory is found to be cor
67. ings are in the second row of the Column Heading line Patient data that is presented in the chart from left to right is the time that the line was obtained the current SpO2 value being measured the current Pulse Rate in beats per minute bpm the current Pulse Amplitude PA and the operating status of the NPB 295 10 4 2 Patient Data and Operating Status Time TIME 01 Jul 97 14 00 00 The Time column represents the NPB 295 real time clock Patient Data NPB 295 VERSION 1 0 0 1 CRC XXXX SpO2 Limit 30 100 PR Limit 100 180 bpm TIME Status 01 Jul 97 14 00 06 Patient data and the operating status of the unit are highlighted in the display above Parameter values at the time of the printout are displayed directly beneath the heading for each parameter In this example the SpO2 is 100 and the PR is 190 beats per minute The next to the 190 indicates that 190 beats per minute is outside of the alarm limits indicated in the top row for pulse rate If no data for a parameter is available three dashes will be displayed in the printout PA is an indication of Pulse Amplitude The number can range from 0 to 254 There are no alarm parameters for this value It can be used for trending information It is an indication of a change in pulse volume pulse strength or circulation Operating Status NPB 295 VERSION 1 0 0 1 CRC XXXX sei Limit 30 100 PR Limit 100 180 bpm TIME 5002 BPM 01 Jul 97 14 00 06 100
68. isassembly Guide Table 5 6 Serial Port Problems 1 No printout is being received 2 The RS 232 nurse call is not working 5 6 The unit is running on battery power Connect to an AC source The monitor s baud rate does not match the printer s Change the baud rate of the monitor following instructions in paragraph 4 2 4 The monitor s data port protocol setting is incorrect Change the monitor s data port protocol setting following instructions in Appendix A If the condition persists replace the UIF PCB The unit is running on battery power Connect to an AC source Verify connections are made between pins 5 GND and 11 nurse call of the data port Verify output voltage between ground pin 5 and pin 11 is 5 to 12 volts DC no alarm and 5 to 12 volts DC during alarm If the condition persists replace the UIF PCB Section 5 Troubleshootin 5 6 ERROR CODES An error code is displayed when the NPB 295 detects a non correctable failure When this occurs the unit stops monitoring sounds a low priority alarm that cannot be silenced clears patient data from the display and displays an error code Table 5 7 provides a complete list of error codes and possible solutions Battery dead 2 Table 5 7 Error Codes Possible Solutions 1 POST failure m UIF PCB Too many microprocessor resets within a period of time Error on UIF PCB Boot CRC Error Flash ROM corruption Excessiv
69. l pulse reflect absorption by arterial blood nonpulsatile blood and tissue The measurements that are obtained between arterial pulses reflect absorption by nonpulsatile blood and tissue By correcting during pulse absorption for between pulse absorption the NPB 295 determines red and infrared absorption by pulsatile arterial blood Because oxyhemoglobin and deoxyhemoglobin differ in red and infrared absorption this corrected measurement can be used to determine the percent of oxyhemoglobin in arterial blood SpO2 is the ratio of corrected absorption at each wavelength 11 2 1 Functional versus Fractional Saturation The NPB 295 measures functional saturation that is oxygenated hemoglobin expressed as a percentage of the hemoglobin that is capable of transporting oxygen It does not detect significant levels of dyshemoglobins In contrast some instruments such as the IL282 Co oximeter measure fractional saturation that is oxygenated hemoglobin expressed as a percentage of all measured hemoglobin including dyshemoglobins Consequently before comparing NPB 295 measurements with those obtained by an instrument that measures fractional saturation measurements must be converted as follows Section 11 Technical Supplement functional _ fractional 100 saturation saturation X 100 carboxyhemoglobin methemoglobin 11 2 2 Measured Versus Calculated Saturation When saturation 15 calculated from a blood gas measurement of
70. n The Up and Down arrow keys can be used to change the choice from Yes to No Selecting Yes enables the Reminder Selecting No disables the Reminder when the audible alarm 15 set to Off Blank Page SECTION 5 TROUBLESHOOTING 5 1 5 2 5 3 5 4 5 5 5 1 Introduction 5 2 How to Use this Section 5 3 Who Should Perform Repairs 5 4 Replacement Level Supported 5 5 Obtaining Replacement Parts 5 6 Troubleshooting Guide 5 7 Error Codes INTRODUCTION This section explains how to troubleshoot the NPB 295 Tables are supplied that list possible monitor difficulties along with probable causes and recommended actions to correct the difficulty HOW TO USE THIS SECTION Use this section in conjunction with Section 3 Performance Verification and Section 7 Spare Parts To remove and replace a part you suspect is defective follow the instructions in Section 6 Disassembly Guide The circuit analysis section in the Technical Supplement offers information on how the monitor functions WHO SHOULD PERFORM REPAIRS Only gualified service personnel should open the monitor housing remove and replace components or make adjustments If your medical facility does not have gualified service personnel contact Mallinckrodt Technical Services or your local Mallinckrodt representative REPLACEMENT LEVEL SUPPORTED The replacement level supported for this product is to the printed circuit board PCB and major subassembly level Once you
71. n A Different Carton 8 3 Section 9 Specifications HT 9 1 9 1 General ha RE ed an 9 1 9 2 Electrical 45i ashami r an 9 1 9 3 Physical Characteristics 9 1 9 4 Environmental EE ren ERO HERR denied 9 1 9 5 Alarms inibi tice 9 2 9 6 Factory Default Settings A 9 2 9 7 Performances ea EE EE N 9 2 Section 10 Serial Port Interface Protocol 10 1 10 1 Tree ele Le EE 10 1 10 2 Configuring The Data Port 10 1 10 3 Connecting To The Data Port 10 2 10 4 Real Time Printout 5 50 5054545555 ng 55555 10 3 10 5 Trend Data 16 555555555 5 5 n kh 10 6 10 6 Nurse Call 2 d se Ei 10 6 AR e RE TEE 10 7 Section 11 Technical Supplemen ee ee ER Re Re Ee ee ee Ge 558555 11 1 11 1 sIntrOdUCHON oia OE EE EE EE EE EE 11 1 11 2 o nie EE EE 11 1 11 9 CPrEUtANAYS S EE EE RE 11 2 11 4 Functional Overview 11 2 oi cac ee E EE 11 3 11 6 Power Supply Pcb Theory Of Operation 11 3 VE EE ag Ela uma az ie 11 4 11 8 User Interface Pcb Uif 9555 99995555999955 11 5 11 9 Front Panel Displa
72. n an audible alarm occurs these voltages switch polarity This signal is only available if the instrument is operating on AC power For more information on Nurse Call refer to paragraph A6 in this Appendix Analog calibration signals are provided to adjust a recorder to the output of the instrument Selectable calibration signals are 1 0 volt DC 0 0 volts DC and Step The signals are accessed by pressing Setup Next Next and Analog For more information on the analog signals refer to paragraph A7 in this Appendix 10 3 CONNECTING TO THE DATA PORT 10 2 Data is transmitted in the RS 232 format pins 2 3 and 5 or RS 422 pins 1 4 9 and 12 RS 232 data can be transmitted a maximum of 25 feet The pin outs for the data port are listed in the chart below Section 10 Serial Port Interface Protocol Table 10 1 Data Port Pin Outs Pin Signal 1 RXD RS 422 positive input 232 RS 232 output RS 422 positive output 6 LAN SpO2 analog saturation output 7 Normally Open Dry Contacts for EN Nurse Call N O with no audible alarm Normally Closed Dry Contacts for Nurse Call m N C with no audible alarm 9 RXD RS 422 negative input Nurse Call RS 232 level output 1 5 to 12 volts DC with no audible alarm 5 to 12 volts DC with audible alarm Note When the instrument is turned off the contact at pin 7 becomes closed and the contact at pin 8 becomes open The pin layout is illustrate
73. nt continues monitoring normally and that the low battery indicator is not lit If the low battery indicator is illuminated perform the procedure outlined in step 3 3 1 Connect the instrument to AC and verify the backlight and AC Battery Charging indicator turn on and that the instrument is monitoring normally The following tests are an overall performance check of the system 3 8 3 3 3 2 1 LED Excitation Test 3 3 3 2 2 Operation with a Live Subject Section 3 Performance Verification 3 3 3 2 1 LED Excitation Test This procedure uses normal system components to test circuit operation A Nellcor Oxisensor IT oxygen transducer model D 25 is used to examine LED intensity control The red LED is used to verify intensity modulation caused by the LED intensity control circuit 1 Connect the monitor to an AC power source 2 Connect an SCP 10 or MC 10 sensor input cable to the monitor 3 Connect a D 25 sensor to the sensor input cable 4 Press the Power On Off button to turn the monitor on 5 Leave the sensor open with the LEDs and photodetector visible 6 After the monitor completes its normal power up sequence verify the sensor LED is brightly lit 7 Slowly move the sensor LED in proximity to the photodetector element of the sensor Verify as the LED approaches the optical sensor that the LED intensity decreases 8 Open the sensor and notice that the LED intensity increases 9 Repeat step 7 and the intensi
74. ntative 5 Inspect the fuses for proper value and rating F1 amp F2 0 5 amp slow blow Mallinckrodt recommends replacing the instrument s battery every 2 years When the NPB 295 is going to be stored for 3 months or more remove the battery prior to storage To replace or remove the battery refer to Section 6 Disassembly Guide If the NPB 295 has been stored for more than 30 days charge the battery as described in paragraph 3 3 1 A fully discharged battery requires 14 hours with the monitor in standby or 18 hours if it is in use to receive a full charge The battery is being charged whenever the instrument is plugged into AC 2 1 Blank Page SECTION 3 PERFORMANCE VERIFICATION 3 1 Introduction 3 2 Equipment Needed 3 3 Performance Tests 3 4 Safety Tests 3 1 INTRODUCTION This section discusses the tests used to verify performance following repairs or during routine maintenance All tests can be performed without removing the NPB 295 cover All tests except the battery charge and battery performance tests must be performed as the last operation before the monitor is returned to the user If the NPB 295 fails to perform as specified in any test repairs must be made to correct the problem before the monitor is returned to the user 3 2 EQUIPMENT NEEDED Digital multimeter DMM Fluke Model 87 or equivalent Durasensor DS 100A oxygen transducer Oxisensor IT D 25 oxygen transducer Pulse oximeter tester SRC
75. owing procedure to pack the N 295 1 Place the monitor in a plastic bag 2 Locate a corrugated cardboard shipping carton with at least 200 pounds per square inch psi bursting strength 3 Fill the bottom of the carton with at least 2 inches of packing material 4 Place the bagged unit on the layer of packing material and fill the box completely with packing material 5 Seal the carton with packing tape 6 Label the carton with the shipping address return address and RGA number if applicable 8 3 Blank Page SECTION 9 SPECIFICATIONS 9 1 9 2 9 3 9 4 9 5 9 6 9 7 General Electrical Physical Characteristics Environmental Alarms Factory Default Settings Performance 9 1 GENERAL Designed to meet safety requirements of UL 2601 1 CSA C22 2 No 601 1 M90 IEC 601 1 Class I type BF ISO 9919 EMC per EN 60601 1 2 9 2 ELECTRICAL Protection Class Degree of Protection Mode of Operation Battery Type Operating time Recharge period Fuses AC Power Selectable by switch 9 3 PHYSICAL CHARACTERISTICS Dimensions Weight 9 4 ENVIRONMENTAL Operating Temperature Storage Temperature Boxed Unboxed Class I per I E C 601 1 clause 2 2 4 Type BF per I E C 601 1 clause 2 2 26 Continuous Rechargeable sealed lead acid internal 8 hours minimum on new fully charged battery under the following conditions no alarms no analog or serial output devices attached and no backlight
76. r Verify the values are within the following tolerances Oxygen Saturation Range 79 to 83 Pulse Rate Range 37 to 39 bpm e The audible alarm sounds and both the SpO2 and Pulse displays flash indicating that both parameters have violated the default alarm limits Press and hold the Alarm Silence button on the front of the monitor for less than 3 seconds 3 5 Section 3 Performance Verification 6 Verify the SpO2 display indicates 60 and the Pulse display indicates SEC while the Alarm Silence button is pressed T When the button is released the alarm is silenced 8 With the alarm silenced verify the following a The alarm remains silenced b The Audible Silence indicator lights The SpO2 and Pulse displays continue to flash d The pulse tone 15 still audible The audible alarm returns in approximately 60 seconds 9 While pressing the Alarm Silence button press the Down Arrow button until the Pulse display indicates 30 0 Press the Up Arrow button and verify the displays indicate 60 SEC 90 SEC 120 SEC and OFF Release the button when the display indicates OFF Press and release the Alarm Silence button Verify the Alarm Silence Indicator flashes 12 Wait approximately 3 minutes Verify the alarm does not return 13 After 3 minutes the alarm silence reminder beeps three times and will continue to do so at approximately 3 minute intervals 3 3 3
77. r Entry N Module Positive Battery Terminal Negative Battery Terminal 9 Place the Power Supply in the bottom case Caution When installing the Power Supply tighten the seven screws to a maximum of 10 inch pounds Over tightening could strip out the screw holes in the bottom case rendering it unusable 10 11 12 13 14 15 16 Install the seven screws in the power supply and tighten Connect the cooling fan harness to J1 of the power supply Use a 10 mm wrench to connect the power supply ground lead to the equipotential lug Tighten to 12 inch pounds Follow the procedure in paragraph 6 7 step 5 and 6 Verify the ground wire to the PEM is positioned so that it does not come into contact with components on the Power Supply PCB Reconnect W4 and WS to the battery by following the instructions in Table 6 1 Complete the procedure in paragraph 6 5 Section 6 Disassembly Guide 6 9 COOLING FAN REMOVAL INSTALLATION Removal 1 Complete the procedures in paragraphs 6 2 and 6 4 2 Disconnect the fan wire harness from J1 on the Power Supply PCB see Figure 6 7 3 Lift the cooling fan from the slots in the bottom case see Figure 6 7 Figure 6 7 Cooling Fan Installation 4 Connect the cooling fan wire harness to 1 on the Power Supply PCB 5 Insert the cooling fan into the slots in the bottom case with the padded sides on the top and bottom and the fan s
78. red at the battery will be slightly higher than the values listed above The user will be unable to begin monitoring a patient if the battery voltage remains below this point If either event occurs plug the unit into an AC source for 14 hours to allow the battery to fully recharge When the NPB 295 is powered by AC the RS 232 Nurse Call function is available If no audible alarm conditions exist the output will be 5 to 12 volts DC or 5 volts DC to 12 volts DC These voltages are dependent upon the option selected by the use of the softkeys Should an audible alarm occur the output will change polarity The 331 also controls a set of dry contacts provided by a relay on the UIF PCB The relay will function normally on AC power or on the internal battery power When the CPU sends a tone request three items are used to determine the tone that 15 sent to the speaker First pulse tones change with the SpO2 value being measured The pulse beep tone will rise and fall with the measured SpO2 value Second three levels of alarms each with its own tone can occur High Medium and Low priority Third the volume of the pulse tone and alarm is user adjustable Alarm volume can Section 11 Technical Supplement be adjusted from level 1 to level 10 with level 10 being the highest volume Setting the volume to zero can turn off pulse tones A real time clock is provided by the NPB 295 A dedicated real time clock chip provides this Us
79. relating to nonresponsive buttons and recommended actions If the action requires replacement of a PCB refer to Section 6 Disassembly Guide Table 5 3 Button Problems The NPB 295 responds Replace Top Housing assembly to some but not all buttons If the buttons still do not work replace the UIF PCB The NPB 295 turns on Replace Top Housing assembly Ifthe buttons still do not work replace the UIF PCB any of the buttons 5 5 3 Display Alarms Table 5 4 lists symptoms of problems relating to nonfunctioning displays audible tones or alarms and recommended actions If the action requires replacement of a PCB or module refer to Section 6 Disassembly Guide Table 5 4 Display Alarms Problems 1 Display values are Ifthe sensor is connected replace the sensor missing or erratic connector assembly Ifthe condition persists replace the sensor extension cable Ifthe condition still persists replace the UIF PCB Display pixels do not Check the connection between the UIF PCB and the light Display PCB Ifthe condition does not change replace the Display PCB Ifthe condition still persists replace the UIF PCB Alarm sounds for no Moisture or spilled liquids can cause an alarm to apparent reason sound Allow the monitor to dry thoroughly before using Ifthe condition persists replace the UIF PCB Alarm does not sound Replace the speaker as described in Section
80. rent and AAMI Standard ESI enclosure risk current This test is for ungrounded enclosure current measured between enclosure parts and earth The applied voltage for AAMI ANSI is 120 volts AC 60 Hz and for IEC 601 1 the applied voltage is 264 volts AC 50 to 60 Hz 1 Connect the monitor AC plug to the electrical safety analyzer as recommended by the analyzer operating instructions 2 Place a piece of 200 cm2 foil in contact with the instrument case making sure the foil is not in contact with any metal parts of the enclosure that may be grounded 3 Measure the leakage current between the foil and earth Note The analyzer leakage indication must not exceed values listed in Table 3 3 Table 3 3 Enclosure Leakage Current Limits AC LINE NEUTRAL IEC 601 1 AAMI ANSI CORD LINE ES1 CORD STANDARD 3 4 2 3 Patient Applied Risk Current This test is in compliance with AAMI Standard ESI patient applied risk current and IEC 601 1 patient auxiliary current The leakage current is measured between any individual patient connection and power earth ground The applied voltage for AAMI ANSI is 120 volts AC 60 Hz and for IEC 601 1 the applied voltage is 264 volts AC 50 to 60 Hz 1 Configure the electrical safety analyzer as follows Function Patient Leakage Range uA 2 Connect the monitor AC plug to the electrical safety analyzer as recommended by the analyzer operating instructions for Patient Leakage Current 3 Connect t
81. result in an invalid tone Both values can be selected for the current patient but they will be lost when the instrument is turned off 42 1 Factory Default Settings Factory power on default settings for the NPB 295 are listed in Table 4 1 Following the procedures listed in the paragraphs that follow can change these settings 4 1 Section 4 Power On Settings and Service Functions Table 4 1 Factory Default Settings 43 SERVICE FUNCTIONS 4 3 1 Introduction These functions can be used to select institutional defaults and to access information about the patient or instrument A Mallinckrodt Customer Service Engineer should only access some of the items available through the service functions These functions will be noted in the text 4 3 2 Accessing the Service Functions The sensor cable must be disconnected from the instrument to access service functions Simultaneously press the 4th softkey from the left and the contrast button for more than 3 seconds The menu bar will change to the headings listed in Figure 4 Note Ifa Sensor Disconnected prompt appears on the screen press the Alarm Silence button and repeat the above procedure Note Ifthe above steps are performed with a sensor cable connected only the Param and Exit softkeys appear on the screen NELLCOR PURITAN BENNETT NPB 295 e r e e e wo e O Figure 4 1 Servi
82. rupted it is discarded 11 9 FRONT PANEL DISPLAY PCB AND CONTROLS 11 9 1 Display PCB The Front Panel LCD PCB provides visual patient data and monitor status At power up all indicators and pixels are illuminated to allow verification of their proper operation Next the Nellcor Puritan Bennett logo and the software revision level are displayed After this cycle has been completed the instrument is ready to begin monitoring The LCD allows the user to select among several different types of displays Graphs which are used for trend screens can be displayed Real time patient data can include a plethysmographic waveform and digital values for SpO2 and BPM Ifa plethysmograph is not desired the operator can select to view only digital data for SpO2 and BPM along with a blip bar to show pulse intensity 11 9 2 Membrane Keypad A membrane keypad is mounted as part of the top case A ribbon cable from the keypad passes through the top case and connects to the UIF PCB Nine keys allow the operator to access different functions of the NPB 295 These keys allow the user to select and adjust the alarm limits cycle power to the unit and to silence the alarm Alarm volume and alarm silence duration can also be adjusted via the keypad Pressing the softkeys can access a number of other functions These functions are discussed in greater detail in Section 4 Section 11 Technical Supplement Five LEDs are also part of the membrane keypad Th
83. s manual SPO2 Normal 95 Display Mode LCD display backlight ON or OFF Select alarm limit Return to to be adjusted main display Select Language Adjust baud rate and protocol Norm or Volt 1 Volt Norm or Step Select data from last Return to 12 30 min or last 1 main display 2 4 8 12 or 24 hrs Display both Display SpO2 and SpO2 Data pulse trend data Display pulse trend Return to main display Print trends Returns to Return to prior menu main display CXES O C Deletes all Return to prior trend info trend menu Figure 1 2 User Softkey Map 1 2 Section 1 Introduction Y 2X Lt T 0 50A 250V NRTUC NPB NPB 295 EJ 7 100 120 vd 200 240 50 60 He 20VA 5 4 1 Equipotential ground Terminal 4 Fuse Receptacle 2 AC Inlet 5 Voltage Selection Switch 3 DB 15 Interface Connector Data Port Figure 1 3 NPB 295 Rear Panel 1 3 RELATED DOCUMENTS To perform test and troubleshooting procedures and to understand the principles of operation and circuit analysis sections of this manual you must know how to operate the monitor Refer to the NPB 295 operator s manual To understand the various Nellcor sensors that work with the monitor refer to the individual sensor s directions for use 1 3 Blank Page SECTION 2 ROUTINE
84. t increments Each increment will be held for 1 second Through use of the softkeys the 0 0 volts DC 1 0 volt DC or stair step signal can be selected individually refer to Section 4 Blank Page SECTION 11 TECHNICAL SUPPLEMENT 11 1 Introduction 11 2 Oximetry Overview 11 3 Circuit Analysis 11 4 Functional Overview 11 5 AC Input 11 6 Power Supply Theory of Operation 11 7 Battery 11 8 User Interface PCB UIF 11 9 Front Panel Display PCB and Controls 11 10 Schematic Diagrams 11 1 INTRODUCTION This Technical Supplement provides the reader with a discussion of oximetry principles and a more in depth discussion of NPB 295 circuits Block and schematic diagrams support a functional overview and detailed circuit analysis The schematic diagrams are located at the end of this supplement 11 2 OXIMETRY OVERVIEW The NPB 295 is based on the principles of spectrophotometry and optical plethysmography Optical plethysmography uses light absorption technology to reproduce waveforms produced by pulsatile blood The changes that occur in the absorption of light due to vascular bed changes are reproduced by the pulse oximeter as plethysmographic waveforms Spectrophotometry uses various wavelengths of light to qualitatively measure light absorption through given substances Many times each second the NPB 295 passes red and infrared light into the sensor site and determines absorption The measurements that are taken during the arteria
85. the bottom case with the fuse drawer facing down A tab in the bottom case holds the PEM in place Insert the bottom wing of the PEM between the tab and the internal edge of the side wall of the bottom case Push the PEM down and towards the outside of the monitor until it clicks into place 6 Position the ground line from the PEM so that it does not come into contact with components of the Power Supply PCB 7 Complete the procedure in paragraph 6 5 Section 6 Disassembly Guide 6 8 POWER SUPPLY REMOVAL INSTALLATION Removal 1 Complete the procedures in paragraphs 6 2 and 6 4 2 Disconnect the leads from the battery 3 Complete the procedure in paragraph 6 7 steps 2 through 3 4 Use a 10 mm wrench to disconnect the Power Supply ground lead from the equipotential lug Figure 6 5 3 Disconnect the fan wire harness from 1 on the Power Supply PCB see Figure 6 7 6 Remove the seven screws shown in Figure 6 6 de Lift the Power Supply out of the bottom case Figure 6 6 Power Supply 6 7 Section 6 Disassembly Guide 6 8 Installation 8 Reconnect the AC leads W1 W2 and W3 to the PEM following the instructions in Table 6 1 below and Figure 6 5 Table 6 1 Power Supply Leads Connections Power Wire Color or Connects To Supply Lead Label Green amp Yellow Equipotential Lug W2 Brown Labeled L on the Power Entry L Module W3 Blue Labeled N on the Powe
86. this test is lt 6 volts RMS 50 or 60 Hz and 25 A 1 Connect the monitor AC mains plug to the analyzer as recommended by the analyzer operating instructions 2 Connect the analyzer resistance input lead to the equipotential terminal grounding lug on the rear panel of the instrument 3 Verify the analyzer indicates 100 milliohms or less Electrical Leakage The following tests verify the electrical leakage of the monitor e Earth Leakage Current e Enclosure Leakage Current e Patient Leakage Current e Patient Source Current Mains on Applied Part Note For the following tests ensure that the AC switch on the rear of the instrument is configured for the AC voltage being supplied Earth Leakage Current This test is in compliance with IEC 601 1 earth leakage current and AAMI Standard ESI earth risk current The applied voltage for AAMI ESI is 120 volts AC 60 Hz for IEC 601 1 the voltage is 264 volts AC 50 to 60 Hz All measurements shall be made with the power switch in both the On and Off positions l Connect the monitor AC plug to the electrical safety analyzer as recommended by the analyzer operating instructions 2 The equipotential terminal is not connected to ground Table 3 2 Earth Leakage Current Limits AC LINE NEUTRAL LEAKAGE POLARITY CORD CORD CURRENT Section 3 Performance Verification 3 4 2 2 Enclosure Leakage Current This test is in compliance with IEC 601 1 enclosure leakage cur
87. tion Use a DVM to verify there is continuity between pins 8 and 15 and that there is no continuity between pins 7 and 15 The Analog Output tests must be performed with the instrument operating on AC power Connect the negative lead of a voltmeter to pin 10 and positive to pin 6 of the data port on the back of the instrument Figure A 1 in Appendix Press the following softkeys Setup Next Next and Analog Press the 1 volt softkey Verify the output voltage is 1 0 0 025 volts DC Leave the negative lead connected to pin 10 and verify 1 0 0 025 volts DC on pins 13 and 14 If step 4 takes more than 2 minutes to complete the analog output will time out Repeat step 2 to initiate the analog output Move the positive lead back to pin 6 Press the following softkeys Setup Next Next and Analog Press the 0 volt softkey Verify the output voltage is 0 0 0 025 volts DC Leave the negative lead connected to pin 10 and verify 0 0 0 025 volts DC on pins 13 and 14 If step 8 takes more than 2 minutes to complete the analog output will time out Repeat step 2 to initiate the analog output Disconnect the voltmeter from the instrument 3 3 3 1 Operation on Battery Power 1 2 Note 3 3 3 2 General Operation With the instrument operating on AC turn on the backlight Disconnect the instrument from AC and verify the AC Battery Charging indicator and the backlight turn off Verify the instrume
88. to an AC source for 14 hours to allow the battery to fully recharge 11 8 USER INTERFACE PCB UIF The UIF PCB is the heart of the NPB 295 All functions except the unregulated DC power supply LCD display and membrane keypad reside on the UIF PCB 11 8 1 Regulated DC Power Supply The UIF PCB receives the Main DC unregulated voltage of 7 to 18 volts DC from the Power Supply or 5 8 to 6 5 volts DC from the internal battery From either of these signals the regulated power supply on the UIF PCB generates 10 0 10 0 5 0 and 5 0 volts DC 11 8 2 Controlling Hardware Two microprocessors reside on the UIF PCB The CPU is a Motorola MC68331CF 331 The second microprocessor PIC16C63 is referred to as the PIC and is controlled by the CPU CPU The 331 is the main controller of the NPB 295 The 331 controls the front panel display data storage instrument status sound generation and monitoring and controlling the instrument s power The 331 also control data port communication and the Nurse Call feature Battery voltage is checked periodically by the processor A signal from the processor turns the charging circuit off to allow this measurement to be taken If the processor determines that the battery voltage is below 5 85 0 1 volts DC a low battery alarm is declared by the PIC If battery voltage on the UIF PCB is measured below 5 67 0 1 volts DC the monitor will display an error code and sound an audible alarm Voltages measu
89. ty will again decrease This variation is an indication that the microprocessor is in proper control of LED intensity 10 Turn the NPB 295 off 3 3 3 2 2 Operation with a Live Subject Patient monitoring involves connecting the monitor to a live subject for a qualitative test 1 Ensure that the monitor is connected to an AC power source 2 Connect an SCP 10 or MC 10 sensor input cable to the monitor 3 Connect 8 Nellcor Durasensor oxygen transducer model DS 100A to the sensor input cable 4 Clip the DS 100A to the subject as recommended in the sensor s directions for use 5 Press the Power On Off button to turn the monitor on and verify the monitor is operating 6 The monitor should stabilize on the subject s physiological signal in about 15 to 30 seconds 7 Verify the oxygen saturation and pulse rate values are reasonable for the subject 3 4 SAFETY TESTS NPB 295 safety tests meet the standards of and are performed in accordance with IEC 601 1 EN 60601 1 Second Edition 1988 Amendment 1 1991 11 Amendment 3 9 Section 3 Performance Verification 3 4 1 3 4 2 3 4 2 1 2 1995 03 and UL 2601 1 August 18 1994 for instruments classified as Class 1 and TYPE BF and AAMI Standard EST ANSI AAMI ES1 1993 e Ground Integrity e Electrical Leakage Ground Integrity This test checks the integrity of the power cord ground wire from the AC plug to the instrument chassis ground The current used for
90. various available parameters The LCD Display PCB contains the LCD which presents the patient data 11 5 AC INPUT Section 11 Technical Supplement Power Entry Power Supply Module Membrane Battery DC Panel Charger Supply Battery LCD Display RTC System RAM 256K lt gt gt Flash ROM i 256K PIC 16C63 i UIF PCB Front End Patient Connection Alarm Speaker MC68331 CPU Data port Figure 11 2 NPB 295 Functional Block Diagram A selector switch on the back of the NPB 295 allows the user to connect the monitor to AC power ranging from 100 volts AC to 240 volts AC The switch has two positions one for 100 volts AC through 120 volts AC and one for 210 volts AC through 240 volts AC Verify the switch selection matches the AC power at your location before plugging the monitor into an AC outlet AC power enters the NPB 295 through the Power Entry Module PEM A 0 5 amp fuse is placed in both the Hot and Neutral lines These user accessible fuses are located in a fuse drawer which is part of the PEM on the back of the instrument 11 6 POWER SUPPLY PCB THEORY OF OPERATION The NPB 295 uses an unregulated linear power supply This power supply provides the DC power needed to charge the battery run the cooling fan and to power the User Interface PCB UIF Electro Static Discharge ESD protection and pat
91. y Pcb And Controls 11 8 Schermalie Diagrams iot aite D o RR OE EE 11 9 LIST OF FIGURES Table of Contents Figure 1 1 NPB 295 Front Panel 1 1 Figure 1 2 User Softkey Map 1 2 Figure 1 3 NPB 295 Rear Panel 1 3 Figure 3 1 NPB 295 Controls ee 3 2 Figure 3 2 Self Test Display 3 2 Figure 3 3 Adjusting SpO2 Upper Alarm Limit 3 3 Figure 3 4 Adjusting SpO2 Lower Alarm Limit 3 3 Figure 3 5 Adjusting High Pulse Rate Alarm 3 4 Figure 3 6 Adjusting Low Pulse Rate Alarm 3 4 Figure 4 1 Service Function SoftkeyS nhe 4 2 Figure 4 2 Service Function Softkey Map 4 3 Figure 4 3 Para SORKCYS 4 uu u eb i e LIRE ng eh be GE Gee Hed 4 3 Figure 4 4 Print SoftkeyS u HH u uu 4 4 Figure 4 5 Trend Printout Re SH meme 4 5 Figure 4 6 Errlog Printout ee ke ee ee ke ee ee ee ke Tnhh ke ee 4 5 Figure 4 7 Instat Printout 548 ke ee ee mem 4 6 Figure 4 8 INEO Printout eet ee teet dd 4 6 Figure 4 9 Next Softkeys se ee ee ke ee ee Re eene 4 7 Figure 4 10 Alarms SoftkeyS esses emm 4 7 Figure 6 1 Fuse Removal se eed
92. y a third time Verify the Pulse lower alarm limit display is boxed and indicates an alarm limit of 40 Press the Power On Off button to turn the monitor off Section 3 Performance Verification 33 3 Hardware and Software Tests Hardware and software testing includes the following tests Operation with a Pulse Oximeter Tester General Operation 3 3 3 1 Operation with a Pulse Oximeter Tester Operation with an SRC 2 pulse oximeter tester includes the following tests Alarms and Alarm Silence Alarm Volume Control Pulse Tone Volume Control Dynamic Operating Range Nurse Call Analog Output Operation on Battery 333 11 Alarms and Alarm Silence 1 Connect the SRC 2 pulse oximeter tester to the sensor input cable and connect the cable to the monitor Set the SRC 2 as follows SWITCH POSITION RATE 38 LIGHT LOW MODULATION OFF RCAL MODE RCAL 63 LOCAL Press the Power On Off button to turn the monitor on After the normal power up sequence press the following softkeys Setup View and Pleth Verify the SpO2 and Pulse initially indicates zeroes Move the modulation switch on the SRC 2 to LOW Verify the following monitor reactions a The plethysmograph waveform begins to track the artificial pulse signal from the SRC 2 b The pulse tone is heard Zeroes are displayed in the SpO2 and Pulse displays d After about 10 to 20 seconds the monitor displays saturation and pulse rate as specified by the teste

NPB-195 Service Manual - Frank`s Hospital Workshop

Contents

Download Pdf Manuals

Related Search

Related Contents