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MEDI-THERM® III
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1. TO CONTROL DISPLAY BOARD u CONNECTOR Jl u 5 o Er c w a x oO o Lor E co um Z Loa E sl D n w fe D r z a O n u w w t eo Eaa aL As n Z D gt gt 2 81888 p p 25 a 6 O 2 lt 59 WU ON SAGEN CB E T E 8 G G E E I amp I 0 O d m E E ee Y CIRCUIT BREAKER FILTER STER E8 FILTER BRN BRN AVVVVVVAAAA O oro UXUIT P3 lt 37 JO oo pon Ja 1 2 M 16 3 4 w 7 22 9 20 6 7 5 B
2. ES FILTER PI Ji s v 5V L x 5V 2 T 54 FBR 5V Ca KN 2 501 5V 5 GND 3 GND a BONDED di R3 P ki e LM385Z 1 2 GND e y ee Ze L COMPRESSOR E C25 GND AKAL ET 12 S 84 L HoT SOL RFU IN 292 U38 HEATER 32 RS RFU OUT lt lt s Gees 102 3201 EOD S L LU U y 7 HEATER lt lt 18 c23 2j de PUMP i 5 EN PUMP r 2a ADDRESS BUS 3 RFU IN 4 N HOT SOL Ls INTO NC COLD SOL cell Re 9 cH 12 4K1 2 WDT
3. PC BOARD INTE m COLD SOL e J3 HOT SOL PUMP HEATER COMPRESSOR e RFU IN WDTRIG FROM sv C47 MICROPROCESSOR BATA BUS usi 9 RNI2 C SECTION 288310 Tell 1 1BK 57 2 0 SHEET 2 S PATIENT SETPOINT D gt pn VEC po 5 IBK 57 DI ki ZIERT 5V 5V 5V 57 ail 8027777 T RN2 D P EH sv DI GEN 2035 or sar ANIZZE 27 57 s T 27 87 s T 5v C4 sv C52 DM D84 cor sur 126 57 us ER 448 ER vs 7 155 DOS usi RN2 E RN3 E 1087212 fi l 1587212 Jr 1 ve EDS DOS aw 4 5 27 87 6 i 27 87 8 Vv 37 ve vl i D7 207 Fa mani BREER HLMP 2785 YELLOW 38 38 28 208 1 15 1 15 B1 BI M Ll 45V a ala EE 15 ie 15 pea I pea n 2575492 As HLMP 2885 DBI El DBI gl NES k oi 3 14 3 14 282 FI 282 nl 24 T 1 T 1 AE P Se l 183 D D83 D 8 YE SCH 5 BWA 33 5 s 4 R2 1 5 5 2 U42 U48 C H i a GE MI 47K Ez BZ ibo HDSP A981 74HC
4. Figure 19 Parts Diagram Base 58 MTA7912 Service Manual ITEM DESCRIPTION PART NUMBER Service Information PART NUMBER ITEM DESCRIPTION EMI Filter Replacement Kit 78197 000 Temperature Probe Assembly RT2 Kit 77737 000 Power Cord Strap 03791 000 Thermostat S1 78193 000 Isolation Transformer T2 78186 000 Transformer T1 Kit 78182 000 Rear Baffle Assembly 07464 001 Circuit Breaker CB1 Kit 78178 000 23 WN Flow Switch S5 Kit 78184 000 Circuit Breaker Cover Kit 78179 000 Power Cord Retainer 10616 000 Quick Disconnect Female 01080 000 WN Power Inlet 91368 000 Heater Assembly HR1 07370 000 9 Hose Barb 5 16 90275 018 Fuse F1 5 mm x 20 mm T L 6 3A 250V 90695 031 Adapter 90726 001 Fuse Holder 90877 001 Hose Barb 1 2 90275 054 Compressor Relay K1 91234 001 Water Level Sensor S4 Kit 77757 000 Condensing Unit Kit 78174 000 Cold Tank Probe RT1 Kit 77759 000 Start Capacitor 90701 141 Pump B1 07368 001 29 Start Relay 78175 000 16 Filter Drier Assembly includes suction 10396 000 Fan Blade 78177 000 service line and capillary tube Wraparound Not Shown 07215 000 RC Network Not Shown connected 17 Solenoid Valve Kit SV1 or SV2 78180 000 31 between pin 8 and pin 4 of Compress
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6. Devices E8 FILTER 09007 CB1 CIRCUIT e E9 El BREAKER PDWER FILTER a FILTER WHT INLET FILTER o BRN 31 WHT T VIJ 1 LINE 21 2200 BRN C LINE 11 1200 BLU RTI T1 BLU 0007 I C RESERVOIR PROBE 84 TRANSFORMER I 2 252 K 25 C LEVEL y SWITCH A RT3 PATIENT AAAAAS DVERTEMP PROBE PROBE JACK RT nU AAA 2 252 K 805 B BLANKET PROBE nei A 2 252 K 25 C p E SWITCH POWER LOSS vw 2200 pF I INDICATUR PC BDARD GRDUND HARNESS H N TERMINAL E Ee D E6 BLOCK FILTER FILTER FILTER C if 2 C D au 3000 bb LLL ds ee 1181818188 P5 Ph l J 4 l IP Litt e ei RRS pia DIGITAL CONTROL PANEL svi 51 2 2 RED COLD SOLBNDI BUT SOLENDID VHT 5392812647 1234567 i 8 S en P4 VALVE VALVE 3 WAT a MAN BLK u 1 SENSUR INTERFACE TRANSFDRMER war e LED J4 TO PATIENT prose 1 O 4 BLK 3 J5 WT 3 JACK 2 Lauro BLK GRY rr E POWER ETT 4 P9 CONTROL DISPLAY 3 Ho Bi E BPN In SCHEMATIC J 5 SCHEMATIC vs 4 4 due PUMP BRN 6 BRN t J Je HYEL 6 TO POWER BOARD Je WHT ALARM TO DIGITAL CONTROL S o O POWER INTERFACE RED PANEL BLU J9 TIEN 7 6 TEST z BLU 9 J10 EN 8 7 T0 o 7 Ju 9 8 SIL A E 10 TO CONTROL DISPLAY BOARD H 10 ALARM BACKUP
7. v S aN AL de la AL la de Li Gi Gei Lal Gi 2 G9 9 oH 6 18111119 al LL OL 6 H ti ly Figure 21 Thermostat Wiring Diagram 61 Figure 22 Control Display Board
8. A8 CURRENT SOURCE U38 A7 COMPRESSOR POWER PC BOARD LATCH DRIVER U51 A6 HEATER PUMP LOW VOLT HOT SOLENOID INTERFACE COLD SOLENOID AUDIO AUTO LEADER LED MANUAL LEADER LED DRIVERS DISPLAYS TO MICROPROCESSOR un INTO ALERT 1 LATCH U53 ADD WATER CHECK PROBE CHECK FLOW DRIVERS REMOVE FROM USE NOW DISPLAYS SELECT RFU_OUT CONTROL LED DEVICES OVERTEMP THERMOSTATS T LOW VOLT 1 SUPPLY LOW VOLT INTERFACE LOW VOLT INTERFACE MICRO PROCESSOR U37 P1 4 NOTES 1 REFERENCE REVISION A HIS DRAW 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 EEPR0M_CE 1 1 t 1 1 1 1 1 1 1 1 1 1 1 1 1 G CORRELATES DATA BUS IWATCHDOG U34 2 CAUTION THIS DRAWING REPRESENTS A ASS SUSCEPTIBLE OF THIS PRODUCT SHALL B PROVISIONS TO PREVENT A ATTENTION Static Sensitive Bevices TO DAMAGE FROM ELECTROSTAT PROBE _IN LEVEL FLOW S3 EMBLY WHICH IS IC DISCHARGE ACCOMPLISHED W LECTROSTATIC DISC HA ARG D EQUATE D
9. 3 Install new head 4 Perform the Functional Check and Safety Inspection section 7 3 9 6 Replacing Thermostats To replace the thermostat see figures 19 p 58 and 21 p 61 Unplug the power cord Remove wraparound from chassis Disconnect spade lugs from thermostat terminals Carefully peel back insulating material A c m Remove the two screws holding the thermostat Remove the thermostat 6 Apply thermal grease to the underside of the replacement thermostat to ensure proper operating temperature ranges Recommended thermal greases Silicone Heat Sink Compound Dow Corning Midland Michigan Thermal Joint Compound Type 120 5 Wakefield Engineering Wakefield Massachusetts 50 A CAUTION Always use thermal grease on thermostats Failure to use thermal grease could raise trip points above the acceptable range 7 Reconnect spade lugs to terminals Refer to figure 21 p 61 to ensure thermostat is connected correctly A C AUTION Do not bend or alter terminals Terminals may break Also bending may alter the trip point range 8 Mount thermostat using existing screws 9 Reapply insulating material 10 Perform the Functional Check and Safety Inspection section 7 3 9 7 Cleaning the Flow Switch To clean the flow switch see fig 12 p 51 and fig 19 p 58 1 Remove nuts item A and remove assembly Loosen hose clamps items B and C and remove hoses Remov
10. Are hoses connected properly one to SUPPLY one o RETURN 2 Connect ls No hoses Repairireblace SV2 coil hot solenoid SV2 properly energized Yes Adjust setpoint to insure COOLING LED is on Are blankets body wraps hoses excessively Replace blankets body wraps hoses No Check cold solenoid 51 1 It should be energized blankets body wraps hoses or connectors pinched or occluded Correct occlusion Line voltage at Connect test setup as shown in figures 17A B Replace power supply fuse F1 board fuse F1 Line voltage at output of Q9 Test flow rate with machine heating and cooling Test switch contact First suspect flow Is flow OK opening before switch S5 See section 3 3 for reinstalling Repair replace inimum value optocoupler U8 input pulled low No Is pin 11 ref to pin 10 of U51 0 VDC Second suspect E See control display PUMP MOTOR board NOT RUNNING No figure 101 Suspect Is pump motor running control display board Repair replace Repair replace Figure 10L Check Water Flow Alert Is On 40 MTA7912 Service Manual Troubleshooting Charts Line oltage at terminals 2 and 3 of 7817 Yes Replace power supply fuse F2 board fuse F2 kk Is a steel object attracted to center top of the valve ls SVI coil
11. HO5VVF3G1 00 3 5 Regulatory Regulatory Medical Device Directive 93 42 EEC Class lib indicated by CE mark 3 6 Classification Classification e EN60601 1 Class 1 grounded not suitable for use in the presence of flammable anesthetic mixture with air or with oxygen or nitrous oxide Not classified for protection against harmful ingress of liquid e EN60601 1 2 Class A CISPR 11 emission requirements e EN60601 2 35 Blankets Body Wraps Accessories 4 0 Blankets Body Wraps Accessories Single Patient Use Blankets Polymer with Nonwoven Fabric REF DHP810 O R Table and General Use 64 cm x 163 cm REF DHP812 Pediatric General Use 56 cm x 84 cm REF DHP813 Adult General Use 76 cm x 163 cm Single Patient Use Blankets All Vinyl REF DHP901 Adult General Use 64 cm x 175 cm REF DHP902 Pediatric General Use 64 cm x 91 cm Reusable Blankets All Vinyl REF HP7010 Adult General Use 64 cm x 175 cm REF HP7020 Pediatric General Use 64 cm x 91 cm Single Patinet Use Torso Wraps Polymer with Nonwoven Fabric REF DHV530 Small Medium REF DHV535 Large Single Patinet Use Leg Wraps Polymer with Nonwoven Fabric REF DHL540 One size fits all All blankets require use of the reusable DBK35CE Connector Hose Accessories see item 1 p 59 Detachable Power Cords REF DBK35CE Connector Hose 3 meters REF PAT101CE Reusable Adult Patient Probe 3 meters Rectal Esophageal REF PAT102CE Reusa
12. Hose GAYMAR PRK2 Patient Temp Simulator Kit or a Precision Decade Box 0 10K ohms 0 296 accuracy 1 ohm increments GAYMAR DHP901 or DHP813 Hyper Hypothermia Blanket Ground Resistance Checker Current Leakage Tester e Static Control Wrist Strap A DANGER Risk of electrical shock when parts are electrified MTA7912 Service Manual Functional Check and Safety Inspection Follow the following procedures carefully paying particular attention to test setups Any deviation from the setups procedures or test equipment may result in incorrect or misleading results Before making any repairs be sure to recheck your test setup procedure and test equipment a Condition of Chassis The following inspections should be performed 1 The chassis should be clean and relatively free of rust and corrosion 2 Exterior screws should be tight 3 Legends markings and operator instructions should be legible 4 Dirt that has accumulated in vents and cooling fins within the machine should be removed with a vacuum cleaner or compressed air hose This will require removal of the rear baffle assembly 5 Check that the casters are tight and functioning properly 6 The quick disconnect fittings on the machine may become stiff and difficult to engage If so apply a silicone base lubricant to the inside of the machine fittings and the outside of the blanket connector 7 Clean the Probe Check Well according
13. backup system 2 circuits Figure 10K L Microprocessor system failure Figure 10C Figure 10H i 2 Backup system 1 not functioning or alarm backup board disconnected t RFU REMOVE FROM USE NOW Figure 9 RFUt Codes 3 If the first overtemp safety circuit is working properly the unit 6 Turn the unit on and select BLANKET CONTROL mode should go into a REMOVE FROM USE NOW alert condition immediately This will allow water to flow past the first over The audible indicator will remain on continuously The entire temp probe and reset it test should take approximately 3 minutes If the unit goes into a REMOVE FROM USE NOW alert condition but the audible indicator does not remain on the first overtemp backup is not functioning and the second overtemp backup has tripped Do not use the machine NOTE Ifthe machine goes into a REMOVE FROM USE NOW alert condition again when selecting BLANKET CONTROL the second over temp backup device the thermostat has also tripped Turn the machine off Connect a Request seme hose to the SUPPLY fitting Direct the other If the unit does not go into a REMOVE FROM USE NOW end of the hose into a water container so that alert condition do not use the machine Request service water from the cold reservoir will siphon past the thermostat and reset it Allow water to 4 Turn the machine off This will end the TEST MODE A flow for approximately two minutes 5 Reconnect hoses to the fittings
14. heater is used to quickly heat the water WATER TEMPERATURE CONTROL Hot and cold solenoid valves regulate the flow path by directing water returning from the blanket body wrap to either the hot or cold water reservoir Regulating the flow path controls the temperature of water pumped to the blanket body wrap The main microcontroller controls solenoid valve operation Only one valve operates at a time When the WARMING status light is lit the hot solenoid valve is open Water returning from the blanket body wrap circulates through the hot water reservoir and is heated before being pumped back to the blanket body wrap The heater pump and hot solenoid valve are energized See figure 15A page 54 When the COOLING status light is lit the cold solenoid valve is open Water returns from the blanket body wrap to the cold water reservoir and is replenished by chilled water from the cold water reservoir before being pumped back to the blanket body wrap The pump and cold solenoid valve are energized See figure 15B page 54 The refrigeration unit maintains the cold water reservoir temperature and operates independently of the solenoid status When the both the WARMING and COOLING lights are OFF either the water temperature is within 1 070 of the setpoint in BLANKET CONTROL mode or the patient temperature is within 0 5 C of the setpoint in PATIENT CONTROL mode Water temperature is controlled by alternating between heating and coo
15. recorded values are within the limits outlined on Inspection Form item j High Temperature Backup Trip Temperatures The following checks k1 and k2 should be performed in the order shown k1 S2 High Temperature Thermostat Trip Temperature 1 10 Fill machine with distilled water until the green band on float stem is fully visible To test S2 RT3 will need to be disabled This can be accomplished by disconnecting the alarm backup board while the machine is operated in the service modes Note In normal operating modes non service modes a disconnected alarm backup board will be detected and cause a REMOVE FROM USE NOW shutdown condition with a RFU code P stored Unplug the power cord Disconnect the 7 conductor cable harness connector P12 from the alarm backup board See figure 14 page 53 Disconnect the 6 conductor cable harness connector P11 from the alarm backup board See figure 14 Plug the machine in Place the machine in service mode 3 Refer to section 8 1 Service Modes p 23 25 for instructions Run the machine for 5 minutes after the water temperature has reached 41 C Enter service mode 4 see section 8 1 pp 23 26 from service mode 3 Mode 4 will cause the machine to heat up until S2 trips Monitor the water temperature When the ALERT and REMOVE FROM USE NOW LED s light no audible alarm the measured temperature should be within the limits listed on the nspection Form This indic
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17. 56 3 Turn machine on Set machine in BLANKET CONTROL mode 4 Increase the temperature set point to light the WARMING status light Note the flow rate 5 Decrease the temperature set point to light the COOLING status light Note the flow rate 6 The flow rate in both modes should exceed 60 6 liters per hour Functional Check and Safety Inspection MTA7912 Service Manual h NOTE If the unit has been completely drained air can be trapped in the pump causing flow to be decreased To clear the air turn the unit off wait approximately one minute and start again from step 3 Kink the hose to stop the flow The CHECK FLOW indicator should light the FLOW OK indicator should turn off the ALERT indicator should flash on and off and the audible alarm should sound Level Switch Actuation To test the actuation of the level switch perform the following 1 i Fill machine with distilled water until green band on float stem is fully visible The ADD WATER indicator should be off Connect a DBK35CE hose to a supply fitting on the machine and direct the other end to a drain or gallon 4 liter container Turn machine on Set machine in BLANKET CONTROL mode Adjust the temperature set point to 4 C COOLING status light on Allow water to drain until bobber has bottomed out on the drain screen about 3 liters The ADD WATER indicator should be lit and the audible alarm should sound Refill machine with d
18. A Side view FigureD Figure E TAPE 4 STRAP S Figure F Bottom cap flap Carton flap Carton flaps set on bottom cap flaps i 1st Fold 2nd Fold BOTTOM CAP FOLDING DETAIL STRAP Pull this end of strap to tighten INSTRUCTIONS Before repacking the Medi Therm machine perform Steps 1 amp 2 Step 1 Fill unit with distilled water to proper fill line Close the DBK hose assembly clamps refer to manual and attach hose connectors to the supply quick disconnect fittings on the unit Direct the DBK hose assembly Clik Tite connectors to a drain or container having a minimum capacity of twelve 12 liters open the DBK hose assembly clamps Plug unit into proper voltage receptacle turn unit on select BLANKET CONTROL MODE and set temperature to 30 C Drain approximately four 4 liters of water from unit Turn unit off close the DBK hose assembly clamps fasten the Clik Tite connectors together and reopen the clamps Add 0 25 liter of isopropyl alcohol to unit Turn unit on select BLANKET CONTROL MODE set temperature to 30 C and run unit for approximately three 3 minutes Tum power off Step 2 Direct the DBK hose assembly Clik Tite connectors to a drain or container Unfasten the connectors Turn unit on select BLANKET CONTROL MODE
19. B za w 23 24 12 25 13 28 BLU SR T T d d T f Gd t T T f d f m sou REF E o i E a MEET gl a ge uv 1 DES FILTER 1 E i 8191 B oj w izv 3 TO BLU _ BRN LT Ci cis a 3 e o oli wp o T c o S 25 g Toc uev Ts ER Oj Fl al E z u a 5 L L 3 lt Sl 3 Z Go gt x 5 iste WHT E 0810 El El 2 2 8 8 8 a TO ALARM BACKUP NIA Pa PC BOARD J4 220 240 VAC WHT 50 HZ RTI RT2 gt SENSOR RESERVOIR BLANKET Hes INTERFACE E3 PROBE PROBE 188R 8 1UF n J2 P6 FILTER 2 rn e e 4 3 BLU RELAY R38 12V WHT e FAN q t2v gr 288727 ear WHT RCI 1 10 47R 2 T1 P P pi 2 5UF d MEE ca as Li 1000 15 45V us RIB 2 L 4 START BONDED TO DE Zen Ap 7127407 SSUH C1 T sy MOC3B18 98 y BLK CAPACITOR E2 DIGITAL GROUND MR580 5 4 TEN 1000 15 T 6 FILTER X L Sg T VIN VSW f f 4 pop j is rr 0000 e le E gt L lt mL ep onn L 4 E NC ta w22 3sVl T T MBR745 TE CP M 4 ER MAIN START 2 Da 7 2 poe ME 4 gt ch FLOW SWITEH Ki WINDING 14 WINDING MRSQ1 19BB 35V 2 Bak X 8 171 Riz 7 OPEN ON LOW RELAY a P ZBIB3MA A SW NC FLOW Ie Masas 2 ki 1 uz RIS RED dp JP3 W EE I Bi E MEER A 390 a 177 REFRIGERATION UNIT 3 P R27 L s H o 4 BLK I EN BEES 288 ale O 3 5 vR2 T 4 8 as NC VI30LAS 54
20. BUS 84 y NC iw ls la z s RNI C Te B CA BS Nc 5V 27 57 i 2575452 Weiz A _ 4 07715 D4 gg NC AAA a me 3 2 ULN2 Q3AN U58 D E zs 5v R20 GRN 06 1 16 74HC32 Wie YELLOW U23 27K 383904 ok D TOU 5v GND END Cf NE 5V 1 8 HLMP 2755 U26 D 240 32 i RNS F 36 ss El paratag uei B 1215 214 27 87 sv ULN2003AN 777 7 7 T 1 b NT 3 6 2 15 2 13 7 w 4 U28 E b ki n 4 2575432 UB F D A E HNIZZE USB E AN4 D ANS E ULN2B83AN 27 87 BY mK S7 SY ST 47K 54 27 87 sv AD Belo U26 C ANT ANT L PALE Em Y 2575492 8 a z 12 13 sv D gt E sv 4 T WT RN2 C RN2 B 27 57 iid Figure 27B Control Display Board Schematic sheet 3 of 4 REFER TO NOTES ON SHEET 9 6 Sp y 0 6 c s 6 71 MTA7912 Service Manual Alarm Backup Board Schematic TO ALARM POWER FC BOARD AC AC BACKED CONTROL 7 5V CONN SENSE GND ALARM 49 POWER LOSS INDICATOR NC q p an TO AUXILARY SWITCH OF CBI e D TI ST 2 16 12 V BV Q1 LM34Q75 BATT
21. CORRELATES TU DRAWING D 100823 REV A A 2 CAUTION THIS PRODUCT IS SUSCEPTIBLE TO DAMAGE FROM ELECTROSTATIC DISCHARGE ASSEMBLING HANDLING AND PACKAGING OF THIS ASSEMBLY SHALL l p BE ACCOMPLISHED ONLY WITH ADEQUATE GROUNDING PROVISIONS TO PREVENT Static Sensitive ELECTROSTATIC DISCHARGE DAMAGE
22. DOWN button again will do nothing Service Mode 5 To access Press MONITOR ONLY button while in service mode 1 Uses To verify reservoir probe reading To assist troubleshooting cooling problems Description PATIENT TEMPERATURE display shows the cold water reservoir temperature ALERT LED flashes Leader lights flash SETPOINT TEMPERATURE display flashes 5 WATER TEMPERATURE display is blank The pump is on and the cold solenoid valve is open The compressor is controlled using normal control algorithms To exit Pressing any button except the MONITOR ONLY button will reset the machine to standby mode Pressing the MONITOR ONLY button again will do nothing RFU REMOVE FROM USE NOW 26 MTA7912 Service Manual Troubleshooting Charts 8 5 Troubleshooting Charts IMPORTANT Whenever possible perform the Functional Check and Safety Inspection see section 7 3 prior to troubleshooting the machine REMOVE FROM USE NOW conditiion Enter Service Mode 1 See Service Modes section 8 1 Observe RFU code See appropriate REMOVE FROM USE NOW flow chart Figure 10A Accessing RFU Codes 27 Troubleshooting Charts MTA7912 Service Manual RFU CODE 1 Insure integrity of the control display board to power supply board connections Insure integrity of base to power supply board connections Measured values from RT1 or RT2 are not within 0 C and 50 C Suspect
23. Figure 4 Medi Therm III Hyper Hypothermia System Operator Control Panel MTA7912 Service Manual 5 0 Operator Control Panel See figure 5 page 9 MACHINE STATUS FLOW OK indicates water is flowing adequately gt e 4 E WARMING indicates the machine is heating COOLING indicates the machine is cooling TEST LIGHTS flashes all indicator lights and digital displays while sounding an audible alarm ALARM SILENCE temporarily silences the audible alarm The audible alarm will reactivate in 10 minutes if the condition persists ALERTS MN gt e CHECK FLOW indicates the flow of water to the blanket body wrap has been restricted NOTE When two gray hose sets are in use the CHECK FLOW alarm will only sound if the flow through BOTH gray hose sets is occluded CHECK PATIENT indicates the patient probe is sensing an abnormal patient temperature below 29 C or above 40 C It may indicate the patient probe has become dislodged an incorrect probe is being used or a probe has become defective An audible alarm accompanies this alert ADD WATER indicates the water reservoir is filled to less than the recommended level REMOVE FROM USE NOW indicates the Medi Therm Ill machine has shut down due to a malfunction Remove the machine from use Contact qualified medical service personnel FLASHING DISPLAY indicates that the water or patient temperature is not being maintained within the acce
24. and RETURN fittings on the front of the machine 2 Turnthe machine on while simultaneously pressing the TEST LIGHTS button This will put the unit into a TEST MODE In this TEST MODE the water temperature display will light the set point will display 0 and the temperature will start to increase NOTE Ifthe unit flashes CHECK FLOW the hoses have not been disconnected and the temperature will not increase Disconnect the hoses 23 Service Modes MTA7912 Service Manual RFU Code Description Troubleshooting Chart Reset code indicates no RFU condition recorded None Measure water or reservoir probe value is out of the range 0 C to 50 C Figure 10B Microprocessor system failure Figure 10C 4 1 2 3 Compensation resistor 1 R12 is out of spec too high or open circuited Figure 10D 5 Compensation resistor 1 R12 is out of spec too low or short circuited Figure 10D Compensation resistor 2 R13 is out of spec too high or open circuited Figure 10E Compensation resistor 2 R13 is out of spec too low or short circuited Figure 10E Water probe measurement is out of spec possibly open or short circuited Figure 10F Reservoir probe measurement is out of spec possibly open or short circuited Figure 106 Microprocessor system failure CHECKSUM Figure 10C E Microprocessor system failure RAMTEST Figure 10C Microprocessor received REMOVE FROM USE NOW signal from the backup system 1 or
25. backup system is independent of both the main microcontroller and the first backup system It limits the temperature of water exiting the machine in the event of a failure of control circuitry including the main microcontroller This is accomplished using two bimetallic thermostats If either of these two thermostats is actuated they open the heater circuit directly and trigger an analog REMOVE FROM USE NOW circuit separate from BACKUP SYSTEM which shuts down the pump and heater lights the ALERT and the REMOVE FROM USE NOW indicators and sounds the audible alarm In addition if the main microcontroller is operational the compressor shuts down the displays blank and the ALERT indicator and audible alarm turn on and off 6 2 Theory System Component Interconnections See figure 14 p 53 for base to head and control display board to power supply board connections figure 25 p 68 for the system wiring diagram figures 26 28 pp 69 72 for the electrical schematics figures 22 24 pp 62 67 for component layouts and part designations and figure 29 p 73 for the system block diagram CONTROL DISPLAY BOARD ALARM BACKUP BOARD AND POWER SUPPLY BOARD The Medi Therm Ill machine uses three printed circuit boards see figure 14 p 53 The control display board contains the main microcontroller circuits the display circuits and all other low voltage control circuits The alarm backup board contains the B
26. components using demultiplexor U49 At the same time the resulting output voltage created by the current through the thermistor is presented to an amplifier circuit U39 and associated components via multiplexor U50 The amplified voltage is then applied to a voltage to frequency converter U24 A frequency up to 100kHz is presented to port pin P3 5 of the microcontroller The microcontroller converts the incoming frequency to a temperature value At regular intervals two compensation resistors R13 and R12 are also processed in the same manner These compensation resistors are precision resistors with values at each end of the probe temperature range of 0 C to 50 C The values from the precision resistors are used to compensate for circuit drift 6 4 2 Digital Control Panel Input User input is entered via a digital control panel The input from the buttons is decoded by U45 The data available line of U45 is tied to the main microcontroller port pin P3 3 When a button press is decoded and debounced by U45 the data available line goes high and the microcontroller responds by inputting the decoded value 6 4 3 Display Update For display of measured and set point temperatures 7 segment LED displays are utilized The set point display is driven by driver chip U48 The main microcontroller interfaces to it via the data bus at addresses OFFF8H OFFF9H OFFFAH OFFFBH MTA7912 Service Manual Theory of Operation The pa
27. energized Di No Suspect base to power Repair replace supply board cold solenoid connection SV1 Repair Disconnect ls cold solenoid SV1 cold solenoid Measure coil SVI coil resistance for short shorted Suspect Suspect board to board Q9 or U8 connection Repair replace Repair power supply ls optocoupler U7 input pulled low Line voltage at output of Q8 ls pin 9 ref to pin 10 of U51 0 VDC Suspect control display board Repair replace Suspect board to board connection Repair Suspect Disconnect base to power supply board connection hot solenoid SV2 Measure coil resistance for short ls hot solenoid SV2 coil shorted Suspect Q8 or U7 Repair replace power supply board Yes Assume 08 triac is also damaged Repair replace power supply board Repair replace hot solenoid SV2 ls impeller broken or cracked Call No your local dealer Yes NOTES The line voltage measured should be the same as that measured across terminals 4 and 3 of TB1 There may be residual voltage between terminals 2 and 3 or terminals 1 and 3 of TB1 when the circuitry is in the OFF state because of the solenoid valve construction and circuit balina configuration These are not considered line cold solenoid evt voltage Replace impeller kk The solenoid coil can be tested with a multimeter set
28. functional checks may be aided by using the Medi Therm 111 machine s service modes of operation 8 1 Service Modes All service modes are entered from service mode 1 by pressing the appropriate digital control panel button within 10 seconds of entry into service mode 1 If no button is pressed after service mode is entered the machine will reset itself to standby mode after 10 seconds See table 3 for a description of each mode To initiate service mode 1 1 Turn machine off 2 Remove the 6 screws holding the head to the base A CAUTION Wear a static control device connected to the chassis ground to prevent electrostatic discharge See figure 8 page 23 Electrostatic discharge can damage the control display board 3 Liftthe head press and hold service button S3 on the low voltage control display board see fig 8 then turn the machine on In service mode 1 the machine will display the last RFU code on the WATER TEMPERATURE display and the software version on the PATIENT TEMPERATURE display An RFU code may help to debug a machine which has shut down due to a REMOVE FROM USE NOW condition fig 9 p 24 Pressing the TEST LIGHTS button while in service mode will reset the RFU code to zero Whenever returning a Service button S3 on control display board Figure 8 Initiating service mode 1 machine to service reset the RFU code to zero to avoid basing future troubleshooting decisions on an old
29. microcontroller power supply circuits 6 4 9 Battery Charging When the main microcontroller power supply circuits are powered and the auxiliary switch of the circuit breaker CB1 is closed indicating the circuit breaker is in the on position the battery is trickle charged through R3 on the alarm backup board 6 4 10 Detection of Operational Backup System 1 The PIC microcontroller provides the 1 second power up tone for the machine This can be used by the user to ascertain whether the PIC microcontroller is operational But whenever the machine is on the PIC microcontroller also creates a 0 15 second on 0 15 second off square wave pulse which is fed to the main microcontroller via optical coupler U4 on the alarm backup board The main microcontroller constantly monitors for this signal via the CONN SENSE line If the pulse is not there or if it is not if it is not correct the main microcontroller shuts the machine down with a REMOVE FROM USE NOW condition because this indicates that the alarm backup board has either been disconnected or the PIC is not operational MTA7912 Service Manual Functional Check Safety Inspection and Maintenance 7 0 Functional Check Safety Inspection and Preventive Maintenance 7 1 Receiving Inspection Procedures CONCEALED DAMAGE After unpacking the Medi Therm III machine inspect the machine for concealed damage Save all packing material and carefully describe or photograph the damage Notif
30. on the front of the unit 24 MTA7912 Service Manual Service Modes Service Mode 1 To access Press and hold S3 see figure 8 p 23 on the control display board then turn machine on Verification of software version level Last RFU code indication and RFU code reset Verification of proper watchdog functioning U34 Entrance to other modes Description Required for entrance to other modes PATIENT TEMPERATURE display shows software version level WATER TEMPERATURE display shows RFU code Pressing the TEST LIGHTS button will reset the RFU code to zero ALERT LED flashes Leader lights flash SETPOINT TEMPERATURE display flashes 1 10 second duration Machine resets to standby mode after 10 seconds if no buttons are pressed To exit Pressing the BLANKET CONTROL PATIENT CONTROL or MONITOR ONLY buttons will cause entrance into other modes If no further action is taken by the user the machine will reset itself to standby mode after approximately 10 seconds Service Mode 2 To access Press BLANKET CONTROL while in service mode 1 Uses To assist in testing trip point of backup system 2 S1 thermostat Description PATIENT TEMPERATURE and WATER TEMPERATURE displays are blank ALERT LED flashes Leader lights flash SETPOINT TEMPERATURE display flashes 2 Pump and compressor are turned on and cold solenoid valve is opened No temperature measurement is performed by machine Pressing an
31. power supply board a 6 011 connector P11 connects the over temperature probe RT3 and auxiliary switch within the circuit breaker CB1 for sensing POWER LOSS to the alarm backup board at J4 A chassis ground harness from the control display board and alarm backup board connects to the chassis 6 3 Theory Main Microcontroller Power Supply See figure 25 p 68 for the system wiring diagram figures 26 28 pp 69 72 for the electrical schematics figures 22 24 pp 62 67 for component layouts and part designations and figure 29 p 73 for the system block diagram Power enters the Medi Therm 111 machine through circuit breaker CB1 to feed the refrigeration unit through relay K1 and the stepdown transformer T2 The output of T2 is fused with a 6 3 amp fuse located below the TB1 terminal block see figure 19 item 22 Stepped down voltage from T2 then enters the power supply board at J1 to feed the hot solenoid valve cold solenoid valve heater and pump triacs the high voltage latching circuits and transformer T1 Power to drive the low voltage circuits on the control display board is derived from the machine s main microcontroller power supplies which reside entirely on the power supply board The transformer T1 output is rectified and filtered to generate unregulated positive and negative voltages Q5 D1 L1 and associated components are configured as a DC to DC switching regulator in a buck configuration yielding a nominal outpu
32. temperature 15 it between measurement circuitry 811 and 7355 ohms Disconnect connector P6 from J2 on the power supply board and measure resistance between pins 2 and 9 of connector P6 Repair replace the control display board Is it between 811 and 7355 ohms Faulty signal lines between control display board and RT1 No Is RT1 actual temperature between 0 C and 50 C Suspect RT1 Repair replace Run machine If RFU condition RFU code 1 reappears unplug machine and measure resistance between pins 10 and 11 of J1 on back of control display board Measure resistance between Is it between pins 23 and 11 of J1 on back of 811 and 7355 control display board ohms Disconnect connector P6 from J2 on the power supply board and measure resistance between pins 3 and 5 of connector P6 at base Is it between 811 and 7355 ohms Faulty signal lines between control display board and RT2 Is RT2 actual temperature between 0 C and 50 C Suspect RT2 Repair replace Suspect controller failure caused RT1 or RT2 to read an actual temperature outside 0 C to 50 C range Repair replace the control display board Figure 10B RFU Code 1 28 MTA7912 Service Manual Troubleshooting Charts RFU Code 2 RFU Code 3 RFU Code RFU Code E Conversion Failure Conversion Failure CHECKSUM Failure RAMTEST Failure RFU Code L Main Microcontroller system f
33. the chassis ground to prevent electrostatic discharge See figure 8 page 23 Electrostatic discharge can damage circuitry on PC boards 9 3 1 Alarm Backup Board Removal see fig 14 p 53 1 2 Unplug the power cord Disconnect the 26 conductor cable harness connector P1 from the control display board and move it out of the way Disconnect the 7 conductor cable harness connector P12 from the alarm backup board Disconnect the 6 conductor cable harness connector P11 from the alarm backup board Disconnect the single conductor connector P9 from the alarm backup board Note the polarity of the two LED wires before disconnecting the wires from the J3 terminal block on the alarm backup board Disconnect the two wires To release wires from terminal block insert a small screwdriver in slot nearest wire and push screwdriver down see fig 11 Remove the four board mounting screws Push aside the ground harness and transformer cable and lift board out of head 9 3 2 Alarm Backup Board Installation see fig 14 p 53 Unplug the power cord Place the new alarm backup board in the head Install the four 4 board mounting screws Install the corner screw through the ground harness Install the two front screws through the transformer cable retaining clips Connect the single conductor connector P9 from the alarm backup board Reconnect the two LED wires to the J3 terminal block on the alarm backup board ob
34. to service 21 Functional Check and Safety Inspection Form MTA7912 Service Manual Medi Therm Ill Hyper Hypothermia Machine REF MTA7912 Functional Check Inspection Form Location Serial number OK Action iadd k Action Taken YIN Date Initials b Condition of attachment plug e Powercerdandeordreainer I oo E Ciber VE Jo e Power loss 07 t 0016001011015 andalarm po pp 1 WARMING Greater than 6600201177 2 COOLINGIGreaterinan 06001107 EE h tevetswichacuaton pp 0000 Li Coldwateresenoircontalen3 C186 TP j Water temperature controller and display test a Condition of chassis Temperature Control Display Measured Setpoint Reading Temperature x 100 j J _ SS o S T pe EE Display readings within 1 C of temperature setpoint Measured temperature within 1 C of temperature setpoint k1 S2 High temperature backup thermostat 44 C to 49 C oo V Patient temperature display test Probe Patient Resistance Temperature ohms Display anana m Grund esistance ess 010507 n Current leakage pu 200 microamps max WN PF o 100 mioroamps max pup TS Complete the entire Functional Check Inspection Form prior to troubleshooting unit Figure 7 Functional Check Safety Inspection Form 22 MTA7912 Service Manual Service Modes and Troubleshooting 8 0 Service Modes and Troubleshooting Some troubleshooting and
35. to the diode check function With the power off measure the diode drop across the terminals of the solenoid coil in both directions There should be an open circuit in one direction and approximately 0 8V in the other If not the solenoid valve is bad and should be replaced Assume Q9 triac is also damaged Repair replace power supply board 41 Troubleshooting Charts MTA7912 Service Manual Select BLANKET Connect test setup CONTROL mode as shown in Adjust setpoint to 41 C figure 17 Allow machine time to heat 30 minutes max BLANKET BODY WRAP WON T HEAT IN PATIENT CONTROL or BLANKET CONTROL mode ls water temperature display within 1 C If measured temperature contradicts this suspect RT2 Check hot solenoid SV2 Yes it should be on Is there adequate flow Is pump Check pump running it should be running No No NE I See See Is a steel object CHECK WATER PUMP MOTOR attracted to center top of FLOW ALERT IS ON NOT RUNNING the valve figure 10L figure 101 Line voltage at terminals 2 and 3 of TB1 Is SV2 coil energized ls power supply board fuse F2 Replace fuse F2 No good No Yes Suspect base to power Repair replace supply board connection hot solenoid SV2 Repair Line voltage at output of Q8 Suspect Suspect Q8 or U7 base to power supply Repair replace board conn
36. 0 C range 811 to 7355 ohms Repair replace the control display board Figure 10G RFU Code 9 33 Troubleshooting Charts MTA7912 Service Manual RFU CODE P Main Microcontroller detected that Backup System 1 not functioning Insure integrity of alarm backup board connections at P11 amp P12 Repair replace alarm backup board Figure 10H RFU Code P 34 MTA7912 Service Manual PUMP MOTOR NOT RUNNING Verify unit is in PATIENT CONTROL or BLANKET CONTROL modes Line voltage at terminals 5 and 8 of TB12 No Line voltage at input pulled low No Is optocoupler U2 input pulled low No Is pin 8 ref to pin 10 of U51 0 VDC No Suspect control display board Repair replace Disconnect pump and measure resistance for short It should be approximately 10 ohms Yes Troubleshooting Charts Repair replace pump Suspect base to power supply board connection Repair Is pump winding shorted Suspect Q4 or U2 Repair replace power supply board Yes Suspect board to board connection Repair Replace pump Assume Q4 triac is also damaged Repair replace power supply board Figure 101 Pump Motor Not Running 35 36 Troubleshooting Charts Machine doesn t turn on when circuit breaker is in ON position Check that power cord is secure at both the power inlet module and the recep
37. 000 Of ko E Of Lo o4 Los DA on G CN E 618 6 Lo o a Bi Eo roo F088 8 3 a E O o H o 708 771 08 010 HO o4 Hou ot jon Od T N R i ale o ooo E NT ale S a ai le 53 o Fo Food ro 3 jo oto x T z O UE O 0 0 0 FS z z X FLO o N Figure 24 Alarm Backup Board 66 MTA7912 Service Manual Alarm Backup Board See 7 3e R1 R7 R13 Resistor 4 7K 1 AW 5 90092 065 BT1 Rechargeable battery 9V page 18 R2 R6 R10 Resistor 10K 1 4W 5 90092 073 Capacitor 470 25V 90701 061 Resistor 470 ohm 1 4W 5 90092 041 C2 C3 Capacitor 0 tuF 50V 90701 169 Ra R8 R17 Resistor 390 ohm 1 4WW 5 90092 039 c4 Capacitor 0 22uF 100V 90701 017 RS RO R16 Resistor 150K 1 4W 5 90092 101 C5 C6 Capacitor 22pF 50V 90701 168 Resistor 1 050K 1 8W 0 1 90092 424 Diode bridge W04G 90717 042 Resistor 100 ohm 1 4W 5 90092 025 Diode 1N4004 90717 001 R14 R15 Resistor 2 7K 1 4W 5 90092 059 D3 D4 Diode 1N5282 90717 006 91459 001 LED lamp red 4700 90761 015 Contact your Ut Prom programmed alarm Subminiature fuse 0 125A 90695 040 dealer Audible Alarm 90919 003 U2 U3 U4 IC H11A1 90886 002 Voltage regulator LM340T 5 90712 017 Resonator ceramic 4 00 MHz 91226 014 Q2 Q3 Q4 Transistor 2N3904 90868 015 Parts List 67 MTA7912 Service Manual Wiring Diagram NOTES 1 REFERENCE THIS DRAWING
38. 3 prevents Q1 from turning on even if the open thermostat s closes again The output of either U9 or U10 through buffer Q10 signals the main microcontroller that a REMOVE FROM USE NOW condition has resulted Thus should either thermostat S1 or S2 trip the heater and pump are shut off and the main microcontroller is notified 6 4 7 4 Both Backup System and Il On the control display board a high signal from Q10 of the power supply boards feed drivers U52 to light the REMOVE FROM USE NOW LED feeds driver U11 to light the ALERT LED and feeds NOR gate U40 to drive the audible alarm located on the alarm backup board All this is done independent of the main microcontroller The same signal is sent to port P3 2 of the microcontroller through C1 R1 and driver U11 6 4 7 5 If The Main Microcontroller Is Nonoperational If the main microcontroller is nonoperational at the event of a signal from Q10 of the power supply board the user is notified of the REMOVE FROM USE NOW condition by the fact that all the above mentioned indicators are on continuously In addition the separate redundant circuits on the power supply board each triggered by either of the thermostats or one triggered by the PIC microcontroller insure that the pump and heater remain off even if the thermostat closes again or the PIC command signal is lost The REMOVE FROM USE NOW condition remains latched and can be cleared only by an operator intervention in the form
39. 8 2 3 5 6 7 8 9 10 11 ro I N NIN a fa a afa A A Plo N o cO on c N Figure 13 Temperature vs Resistance 52 MTA7912 Service Manual Service Information Ground harness P4 at J4A Patient probe assembly P5 at J3 P2 at J2 P3 at J4 P2471 BS Control Cable display S ue T assembly board NUM de Gg 4 jh 26 conductor P9 at J2 N h P11 at J4 cobos ye RT3 Indicator i m s Power L supply board J3 Alarm A P6 at J2 backup IB MW di x WW E board i i iti Power 2 MN Out LED k T pst am P1 at J1 1 8 Wi Ground harness WW i Chassis P7 at J1 ground Figure 14 Circuit Boards and Connectors head 53 Service Information MTA7912 Service Manual When the Medi Therm 111 machine is heating water flows in the path shown below Cold Water Reservoir Overflow Machine Blanket Body Wrap Connections Water RETURN Temp Hot Water OF RTD Reservoi L R P pe S2 o SUPPLY A Over Y Temperature robe S5 Flow RT3 Switch SV1Cold Solenoid A Blanket or Body Wrap Water bypass prevents overheating when a blanket or body wrap is not connected to the Medi Therm Ill Figure 15A Heating flow diagram When the Medi Therm Ill machine is cooling water flows in the path shown below Cold Water Reservoir Air Vent Hot Wa
40. 82 x 6 5 8 8 A A A A NC 2 NC NC un c z 8 9 7 18 7 18 me 12 Ja la z s U17 D2 h 12 a 8 7 5 DS75492 z 2 13 INTO E2 Hz 257 5551 T eh De 8 a 8 5 DSI F2 ke ar 379 rah A U58 B 252 82 252 62 ci OK UBI E NM m L cn IRD EUS ULN2 3AN BRT Aa s T pr j E m WDTRIG HEAT S SEL 2 gt sl a Lit gap vit V Y l Y c3 C3 AN2 F 16 16 Cap 5V D3 DEE TTT RNI G ES Sena SV ANS C i i 7 27 57 8 T E 27 57 4 I Dm Nc EU RN2 G 20 1 d m 20 2 AER 27 57 6 EE U43 10 gt ut 27 57 2 1 u4 GREEN uas 27 57 5 a2 NC M 257 8881 pz 20 5x3 HLMP 2885 GREEN MEME 2882 16 HLMP 2885 GREEN a s ba 305 ekr i 16 1 16 Bik 18 Ja 8 7 418 84 w la la z 5 aa E yo 04 258 5551 C4 Dt 2 MAE 2 15 2 15 23 50 55 15 SEL D415 24 50 3 14 Ei g E4 26 70 16 gt le nl LI 57 y 4 13 MES ES 80 4 13 4 13 GND END Pi 25V GND GND bi 5V T b 5 12 t T 36 ss 36 ss D z 4 Malt Eh 1 E 2 4 t JE t ABIDE ele M M F 10 7 18 7 18 MEE El U44 8 9 4 8 E 257 4501 ar AUTO PATIENT NEE 7 7 UBI C TS t 1 NC NC NC CONTROL MODE sa ULN2003AN S DB D7 18 ls la 7 5 uis te Je Je z 5 H MAN BLANKET eecht CooL 3 n Ce FROM HDSP 5551 20 2 coo CONTROL MODE FLOW Dt i gt AARW 3 po i MICROPROCESSOR Di D K K SECTION Da A 6 cour u7 NEE EA SHEET 2 RENE V _ J D3 S HEAT 5V ib HLMP 2785 2 S Sv asv 5v sole 27 87 8 T 27 87 2 1 l
41. A LEVEL SWITCH PS J3 tu sis SWITCH OPENS WHEN 4 VIN VOUT T Og Muji Ru WATER SHOULD E B T ZBIB3MA 4 7K SW BE ADDED TRANSFORMER Ci ADJ u2 RIO a POWER Ki 240V 120V ta sav T I er sy MOE3Q21 dud INTERFACE E4 RELAY BE s ji P7 FILTER T LAAAAKW 2 4 5 72 2 VI3BLAS BRN a NC C6 Fi 07 3 a a aat saay 4 i BRN 7 BLU B SA 3 LM328LZ12 NE 04 wili m 2N6348A BLK 4 BLK jP VIN VOUT I ul RB ORC EQUI F1 svi NORM m mv sy 8053018 age 1 8 A Bui i COLD SOLENOID CLosep C20 FT cie TO 5 a VALVE 33a 3sv I la sav a cz F2 EVS va 2 L 2 HV dak E HOT SOLENOID F wa NC 1 e i 411 VALVE C GRY 5 BL WHT Q3 mri sle R AN 8t 2853468 PUMP OR EQUIV ORN WHT 77 1 5000 WHT l s HEATER ne 3 wr NOM COLD RESISTANCE 3 29 OHMS ES 52 51 TETEN YEL mp YEL YEL vio 6 oo OO s R2 us 02 T k any MOESDES IK MOC3863 Sage 23 MT2 2 2N6346A vio 8 8 vio di R24 T El A y 5 Pid s gt OR EQUIV 2 288 NU Le 2N3904 UNI 21K 5 3 RC TBI NE 4 NC rz Mri NC 8 TO ALARM BACKUP 3k un R23 47050 UF TERMINAL BLOCK 4 FC BOARD ki A n gt M JPI Dia amp ls J5 2 IN748A AC E 16 Lcs NOTES AES E R28 Hn R25 T 0 01 400 1 ALL RESISTANCES ARE IN OHMS 17 1 3K HUA 5 1M cu NAM i T i BACKED deu 1 5 338 35 2 ALL RESISTORS ARE 1 40 AND 5X TOLERANCE UNLESS NOTED 0 gi ala T Se i XX 3 ALL CA
42. ACKUP SYSTEM I microcontroller circuits POWER LOSS indicator circuits and its own power supply The power supply board contains the main microcontroller power supply the low voltage to high voltage interface circuits and the REMOVE FROM USE NOW latching circuits The control display board connects to the patient probe jack J1 via P2 at J2 and to the digital control assembly panel via P4 at J4A All other connections from the system s peripheral devices to the control display board are made through the power supply board A 26 pin cable connects the control display board via P1 at J1 to the power supply board via P3 at J4 Five cables connect the components in the base of the machine to the PC boards in the head see figure 14 p 53 A9 pin connector P6 ties the water temperature probe RT2 cold water reservoir probe RT1 flow switch S5 and level switch S4 to the power supply board at J2 and Theory of Operation MTA7912 Service Manual ultimately to the control display board A12 pin connector P7 ties the high voltage devices pump heater hot solenoid valve SV2 cold solenoid valve SV1 and refrigeration compressor relay K1 to the interface circuits on the power supply board as well as thermostats S1 and S2 to the high voltage latching circuitry on the power supply board at J1 on the power supply board A6 pin connector P5 connects transformer T1 housed in the base to the power supply circuitry at J3 on the
43. AIG COMPRESSOR als 5V aa 5V oi 431 8Y 0 1 TO DSP Wy U37 use ANB A ANS A SECTION 88032 74HC373 4 76 55 4 7K S5 CONN_SENSE 18 lt 28 E i 277 LAME SHEET 3 VCC 3 ag VCC 5V k 1 18 4 1 PLOW Sp e xta2 wei P27 gt face u49 ANB B ANS B x Se mai P25 5 A2 PEM 74HC4351 4 7K 55 cse 4 7K 55 LEVEL gt gt 2 IZMHZ STALL wa Pak e 3 4 BA 3 4 PATIENT a 412 P24 M po 2n BLANKET e C37 C40 RST Alli P23 A5 08 Fz D e RN8 C RN9 C xi 22PF 22FF ABI P22 AB o cis vc 4 7K 85 ZP 4 7K 55 23 5 6 5 6 RESER S 491 PZI A7 02s 7758 e 4 PROBE 5V 481 P28 8 03 si YO te ok Pasa s 1 Ag oe Zeg yi L RN8 D RN8 D PE Y 071 9 7 AE os se TE ne 4 7K S5 C54 4 7k 55 ge ANI2 B 18 26 16 7 32K 1 NC 24 ADB 08 All 05 2 Y3 7 8 0 1 7 8 COMP2 12 12 57 RECH sv 7 1 7 AD5 85 AIZ 07 T 8 Et 1 TL PEN s j d ADA 78 4 A3 512 s RNB E ANS E gin cau AD3 8 3 ve 15 2 4 7K 55 C44 47K S5 iecur 12V 25 il J AD2 PB 2 E NE AZA NC pls 1 8 18 0 1 3 18 cover NC TE 12V 3 18 58V PL D I FAL CE GND NC NC 00 Y EM T cp vg PIB 1001 0 8 u m LT GAS FIS EEPROM CES f ah DB D7 12v 26 S pia S S 2 1 0 c22 m EI ed ik ES DATA BUS SECTION DISITAL CONTROL PANEL TO sav Tou ra m PE SHEET 3 PLI ITZEXI T P34 MATRIX DIGITAL CONTROL L gen LJ i sv C38
44. AMAG G O DRAWING D 100448 HANDLING ROUNDING LATCH U54 BUFFER ao A4 DISPLAY DRIVER u5 DISPLAY DRIVER U6 AZI DISPLAY DRIVER U48 COOLING WARMING DRIVERS AUTO PATIENT CONTROL MODE DISPLAYS MANUAL WATER CONTROL MODE MONITOR WDTRIG TO WATCHDOG WATER DISPLAY U12 U14 PATIENT DISPLAY U16 U19 SETPONT DISPLAY U41 U44 CONTROL DISPLAY PC BOARD LOW VOLT INTERFACE MICRO CONTROLLER DISPLAY ALARM PC BOARD LOW VOLT SUPPLY BATTERY OVER TEMP PROBE Figure 29 Block Diagram T3 MTA7912 Service Manual Shipping Instructions COVERASSY 10 screws securing wraparound WRAP AROUND REAR BAFFLE PANEL BASE ASSY MEDI THERM UNIT Figure A D SHIPPING BRACE SHIPPING BRACE Top view WASHER 10 gt e i SHIPPING BRACE SHIPPING BRACES FigureB A CAUTION Failure to install the compressor shipping braces see figure B before shipment can result in extensive damage to the refrigeration section CORNER 3 SUPPORT CARTON SUPPORT 5 V S TAPE BOTTOM CAP Figure C Ey N CARTON TO O S KQ MA
45. Check and Safety Inspection section 7 3 after making repairs and before returning the Medi Therm 111 machine to patient use Improper repair may result in death or serious injury equipment damage or malfunction In addition to the following repair procedures refer to the troubleshooting charts in section 8 5 pp 27 46 Service Modes and Troubleshooting 9 1 Refrigeration System A WARNING Equipment contains refrigerant under high pressure Refer servicing to a certified refrigeration service technician Improper repair procedures can result in serious injury or damage the compressor unit The refrigeration system contains rotating fan blades Do not operate with fan shroud removed Injury could result NOTE Servicing and or repair of the refrigeration system should be performed in compliance with applicable regulations 9 1 1 R 134a Systems A CAUTION Use only R 134a refrigerant and polyol ester oil when charging a Medi Therm Ill R 134a system Using other refrigerants or oils will damage the compressor The Medi Therm III R 134a system uses a polyol ester oil for lubrication because conventional mineral oils do not provide sufficient lubricity and miscibility R 134a refrigerant and polyol ester oil are highly susceptible to moisture absorption It is important that proper system evacuation charging and leak detection procedures be employed Do not leave the refrigeration system open to ambie
46. Di e VIN VOUT e WO4M ADJ C2 47 25V 4 a i ZR F A25A 125V E i R MEIN 4 7K 5V Q2 ANN R3 J 8 283524 470 1 R2 BT ji 9 104 B 4 NIMH D2 t IN4 4 Pa Ji 10 d dh LSI BATT P12 J XC 85 3328 P s gt 5V J2 1 3 14 E jon 283904 m PS J2 ANN J4 AA E R6 1 K J4 CENE a Al GA L Q4 J4 2 3324 E J4 7 J4 BATT ns Ke GE a U3 BS Ria sv 394 HUA 1506 BK BATT 3 NW NW T3 1 2 1 BATT N 194 AM BATT 3 4 VDD z 12506 1 331 nas ANN 4 D3 R14 r DER IN5282 2 4K g R2 Dis ANN ac E E am 11 J3 24 BATTS 22 2 4K NC 7 B5 0 22 1001 IN5282 NW ABE 3 Joe E DS 15 22PF LED 4 80 BATT 0502 B ta vss 6 5 22PF u4 R17 RIS i 4MHZ DI 200 HIA 1506 2 5 P11 RT3 OVERTEMP PROBE 2 252K 625970 HIGHEST DESIGNATOR ON BOARD BT 1 5 D 2 ps 1 F J 4 LS 1 a 4 R 17 T 1 u 5 x 1 REFER TO NOT ES ON SH Figure 28 Alarm Backup Board Schematic sheet 4 of 4 72 MTA7912 Service Manual Block Diagram DIGITAL CONTROL PANEL P33 P2 VFC AMP U24 U39 MUX U50 ADDRESS BUS P3 0 PO 3 1 P34 EEPROM B TxD BUFFER U27 U32 RFU OUT ADDRESS LATCH U30
47. FIB 02 NM P33 F U48 D np a PANEL mm P32 L 7 4HCB2 AB A7 BWA x2 3 x4 E apod c28 exo pai 3 w Teig TO DISPLAY ES vi e 4 sav sv B I mn Paa C SECTION MAN AUTO uP 1 U45 usa c 2 1 Perens 47k 85 SHEET 3 m 212 740922 wll ace 2 74HC32 9 2 1 2 1 2 Y2 Y2 8 7 YA 1N5282 Y 1 vec 17 PSEN LU pe Test su mon pow 2 vi F EN Ir N Bwa RN7 C Yo 8 ER 18 T RNII B ad RNI B Y3 3 15 pon ai xi PL ut A 228 Ya c vss 4 7K 55 l 4 7K 55 Y3 k ili at 1N5282 YA ca 13 csa 74HC4351 c39 3 4 0 1 3 4 d 1 xi 12 20 5V au 5V oi 2 ZE ns 7 xz x mb PA W lI YA x2 5 5 Ya IN5282 x 7415541 12 ET RNII C ANIB C 4 MA vz X3 8 6 7 E C57 s D21 x3 KEM wo 2 Da 15 AK CSS AK 55 RN7 B x4 7 5 E ap VCC U48 B sa VEC 5 5 EN 5 5 x3 0K 94 x 1N5282 oun OSC u PROBE IN 3 18 2 DI 13 17 MAN BLANKET CONTROL MODE s 5V LEVEL 4 A2 Y 17 D6 74HC82 D2 12 si YO 18 T AUTO PATIENT CONTROL MODE NA L F C53 mE zow sl hese 5 32 Yl hs RNII D Tess RNI D xx 2 t h gi FA U4B A y32 8 1 aM rak iE Yah 4 7K S5 4 7K 85 6 74HC82 15 ya 2 13 8 ei Y 8 EL ANI3 E tise 74Hc244 2al 1 OPTS A WT T 20K 94 say MEC RT 1a sav 1 25 Le vec SS a wp Tele DIN RNII E ANI E 3 18 E 13 D E 6 By ox am C43 pim U27 3 TUA Nils AB ve 5 4 7K S5 Ji 4 7K 55 lak 54 CATS3C57P gj 12 be Gel 7 NC NC Y6 5 1 g 1 ER 3 eres s 4 3 x4 A Ty C12 Ven Wa 082 guy YB NC NC om asv Ts a s 11 18 a
48. Jl 9 ss SHIELD to o ii 9 VID SCHEMATIC TO POWER BOARD MON YEL 10 YEL 812 3 4 5 6 7 8 9 10 II 12 13 14 15 16 17 18 19 20 21 22 23 24 es 26 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 po DOWN WHT n DEN tttt tt tttttttttttttttt t ttt ES Rob oq book k bk OR 4 se o O Ba FT TF FA ft AH HA F FILTER a It tT TtTTT TT TT T GE AAA AAA cc Jc lt CABLE ASSY 26 CONDUCTOR 12V Q ew 12V 250V NC RESER ga BLK WHT RFU IN 1 T2 LEVEL AAA TRANSFORMER PUMP YEL Army 240V 120V HEATER St CONN SENSE oot BRN DGND DIGITAL CONTROL DGND PANEL MATRIX BLU 45V RC2 5V 100 OHM 12V X1 X2 X3 X4 O luF 12V Y1 MAN AUTO UP 10000 PROBE RETURN BLANK Ki BRN RFU QUT Ye TEST SIL MON DOWN START RELAY FLOW RELAY COLD SUL BLU 2 4 HOT SOL r Egi 10 v als lec BLU 0 COMPRESSOR DGND BRN DGND 1 i xw 1 Y 45V 2 2 5V BRN BLU 1 BLU BLU O 1J E BRN BRN DN 3 GRN YEL JL BRN IF KI RC1 47 OHM REFRIGERATION UNIT 0 5uF Figure 25 Wiring Diagram 68 MTA7912 Service Manual Power Supply Board Schematic
49. Jo ug pun uoneefujay I i peunseau Jl S84 EN 10 9 9 0088 gunjeJeduie 101950 IM 10695 10 Do UIUYM Aejdsip ejem uo Josse dwoo SI Sal S94 uo eq pinous y LAS 0006 06 poo TU S84 yo eq pinous y NO m YILVM MOSH N xeu 996 NOJJ ejenbope 8484 sj S9A 101 anf Hi 092 1909 1109 LAS SI Buluuni dund S wONINNNY LON YOLOW dWNdu 996 NBA au Jo do 19100 o pa oe e 109 00 pas e s D xew uw 0e 9110 90 esn 1009 0 eun 90060 MO l oun 90 00 MOIIY 1100 Ing 91001 Lesen Dob 0 Julodjas ysnipy TIM dVYM 1 AGO8 L3XNY14 Se dnjes 199 pouyo LAYNVT Palos 195 159 129400 Figure 10N Blanket Body Wrap Will Not Cool sheet 1 of 2 44 Troubleshooting Charts MTA7912 Service Manual peoejdeJ eq pinous pue peq si 91 81 prouejos 90 You J Jeujo euj ul Ag 0 jeyeuuxoudde pue uonoeuip euo ul 100110 uedo ue eq p nous eJeu suoroeilp UJOG ul O9 prouajos y JO speura 90 ssoJoe dosp 900 0 ay enseeui yo amod ou UNM Uonounj 10942 900 0 90 0 jas Jejeuuninul e uj perse eq ULI ioo plousjos SUL xx 908 0 au 9190 9000 jou 916 eseu uoneunDijuoo 1 0 10 pue uononujsuoo BAJA 009 09 ay jo 9978090 9109 440 SU ul S ginoJio ayy ueuM 81 JO pue 18019 JO pue Z sjeuiuJe 099 1190 ebeyon JenpiseJ eq kew 99941 ql jo e p
50. M 84 Te 18 T 2 4 SHIELD 2 ven 1 125 s L T sl 45V sm Ze NC a2 mb A L 305 weii m DA DI 4 2A3 23 nc RB ng NC x1 1N5282 5 DO 1 Y 3 OFG M 244 eu 2Y4 10 01 56 56 DIS WWA MU F gt gt NC 1 5282 NE 5 2K 5v C26 sv 7 i z 12 300 cia SEE Bes gt 4 4 zy a x2 IN5282 U24 R4 ON BOARD 214 ay 34 VFC32 ul 758 cle 1N5282 ci iss HR A7 ween 7 FREO 5V sv N VCCggur 4 22 6K1 14 5 1 8 1 LM388N D 5 JL 4 pr EN NC far NE D7 434 11 A 7 nim C35 NC Nc j P x3 1N5282 MAX691 a AN 8 BEF LLLI E ZAN NC h NE e 2 00K1 NC VOUT Q 1 215 A gt SR RNI3 A 3 1200 330PF m NL Sv Np282 NE 4 BATTON VOUT S 106 57 DN sv IBK S7 4 N C27 Ce R 14 Da VBAT EOT IE T NC 0 1 a 4 Ser Te xa 15282 7 EEN LDM NE ewe Es ne LI SU 410257 amp 4 217 0SCSEL RST Hz 185282 51 wo Le RNI3 D u 58 PFI PFO nc sigg S7 El 1 GND x 1 2208pF E 7 1 PATIENT PROBE Bes 2 252K e25 C 66 RNI2 A FILTER Pa 32 sv IBK 57 ANA A 223 T 1 2 DIAG 1 247K 54 4 IN5282 1 l RNI3 G 5V RN4 B 222 5V igk PATIENT k Ss DN 1BK 57 y a 4476354 225 e 2 ANY 1 IN5282 APAIFG RA RNIB FLOW ENaC 12 F 5v 1ak S7 sv 224 SE EN 7 p 547K 54 227 REFER TO NOTES ON SHEET R14 D3 LEVEL 1 5282 PROBE IN d 47K 1N5282 T ala pa IN m 54 1 Figure 27A Control Display Board Schematic sheet 2 of 4 PATIENT 1N5282 PROBE JACK 70 MTA7912 Servi
51. MEDI THERM Ill Gaymar Your patients Our commitment HYPER HYPOTHERMIA MACHINE REF MTA7912 2 5 R ms V ED Li a Fe C SERVICE MANUAL P N 100909000 Rev B 11 09 Before you begin MTA7912 Service Manual Important Refer to the Medi Therm III Operator s Manual for detailed operating instructions Read and understand the Operator s Manual and all precautions prior to using the Hyper Hypothermia machine Review the SAFETY PRECAUTIONS see page 1 prior to servicing the Medi Therm Ill machine For technical assistance contact your local dealer Receiving Inspection Upon receipt unpack the Medi Therm 111 machine Save all packing material Perform a visual and mechanical inspection for concealed damage by removing the wraparound from the chassis see figure 18 page 57 If any damage is found notify the carrier at once and ask for a written inspection Photograph any damage and prepare a written record Failure to do this within 15 days may result in loss of claim Refer to section 2 0 of this Medi Therm III Service Manual for additional details IMPORTANT Before operating the Medi Therm Ill machine remove the compressor shipping braces See p 74 figure B items 8 and 9 Temporarily remove the power cord retainer fig 19 p 58 item 6 and install the power cord Reattach the power cord retainer Gaymar and Clik Tite are registered i
52. Machine Precautions 1 0 Safety Precautions Review the following safety precautions prior to testing the Medi Therm 111 machine A DANGER Risk of electric shock Refer servicing to gualified medical eguipment service personnel A WARNING Repairs should be performed only by qualified medical equipment service personnel and in accordance with this Service Manual Otherwise damage to the Medi Therm Ill machine and improper therapy may result Do not tip machine over without first draining the water out and unplugging the power cord Electrical shock or damage to the machine can result Use only Gaymar probes see Accessories page 6 or equivalent YSI 400 series probes approved for use with medical devices in the Patient Probe jack Use of other probes could result in erroneous patient temperature values When using the rate controlled Auto Moderate or Auto Gradual modes for warming switching to other modes e g Auto Rapid or Manual or changing the temperature set point during the therapy will cause the Medi Therm to reset the therapy Altering the Mode or Temperature set point may impact the overall duration of the therapy A C AUTION Add distilled water only Failure to use distilled water may result in poor machine performance Do not use alcohol since it is flammable Alcohol may also accelerate blanket body wrap deterioration Do not operate the machine without water since damage to internal components
53. O no O gen yn en zn Du O 5 zo SOS 00000000 0000000 00500000 DOI In c 00000000000000000000 m 00000000000000000000 sn g 199 3 1 00000000 62 MTA7912 Service Manual Control Display Board PN Designator PN R18 90092 065 ae 7 R19 R21 90092 059 C23 C25 C27 RN1 RN3 RNS 91248 001 C28 C30 C31 Capacitor 0 1uF 50V 90701 169 RM 91248 018 1 RNG RN 91248017 RN12 RN 05 90701 167 sus C19 Capacitor 10000 50V 90701 166 P P da LED lt bar green 2885 90761 026 SAA LAN Capacitor 10uF 100V 90701 071 is C56 Get U5 U6 U48 IC ICM7212 90886 072 C26 C32 C35 Capacitor 100pF 300V 90701 111 U7 U8 LED It bar yellow 2785 90761 003 LED It bar yellow 2755 90761 005 90717 058 um 02 90717 002 Re Resistor 750 ohm 14 5 00092046 un 90886 052 Re Resistor 124K 118 1 90030 U37 00886071 R7 Resistor 226K 1 80 19 909234 U38 U39 90886 016 RB Resistor 10 0K 18W 19 90092368 440 90886 036 Ro Resistor 2K M 5 00092056 0404 RO RI RP RS R 0092348 90092364 8006242 0092 42 0092 08 R5 Resist 33k 140 5 9009208 R16 R17 R22 U60 U62 IC ULN2003A 90886 054 Resistor 100K 1 4 5 90092 097 2 Crystal 12MHz 91226 001 Parts List 4 7 1 1 1 1 1 1 R R R R R R R R R 0 1 2 3 4 5 4 63 MTA7912 Service Manual Power Supply Board Fig
54. OL MODE warming a patient in MODERATE or GRADUAL mode only Actuates when actual temperature is not within 1 0 C of the desired warming rate See section 6 4 5 p 14 Specifications MTA7912 Service Manual 3 2 Temperature C 3 3 Thermal continued WARN UP RATE typical COOLDOWN RATE typical Temperature C 5 10 15 20 25 9 5 10 15 20 Time minutes Time minutes Figure 1 Typical water warm up rate Figure 2 Typical water cooldown rate with full size blanket with full size blanket Performance Performance Specifications Patient Temperature Measurement 0 4 C using Gaymar disposable probe Accuracy 0 370 using Gaymar reusable probe 0 1 C Display Accuracy Display Resolution WATER TEMPERATURE Display Resolution PATIENT TEMPERATURE Controller Accuracy WATER TEMPERATURE Controller Accuracy PATIENT TEMPERATURE Flow 60 6 liters per hour Minimum flow rates through a full size Gaymar Hyper Hypothermia Blanket MTA7912 Service Manual Specifications 3 4 Electrical Electrical Specifications Current Leakage Earth Neutral closed 175 microamps maximum Neutral open 125 microamps maximum Current Leakage Patient Probe Neutral closed 100 microamps maximum Neutral open 100 microamps maximum Use only an International harmonized three wire Detachable Power Cord cordset using cordage approved to HD 21 Conductor size is 1 00 mm
55. PACITORS ARE IN MICROFARRADS UNLESS NOTED H a av 213984 2 4 IST KN 4 DENOTES DIGITAL GROUND 5 p J a 4 4 5 DENOTES ANALOG GROUND E gi ki m HIGHEST 8 DENOTES CHASSIS GROUND H m 8 2K SW ON BOARD 7 REFERENCE THIS DRAWING CORRELATES TO DRAWING 1005444000 REVISION B GND 8 CAUTION THIS PRODUCT IS SUSCEPTIBLE TO DAMAGE FROM 5V C 21 JP2 T ua RI7 U3 24 a ELECTROSTATIC DISCHARGE HANDLING OF THIS PRODUCT SHALL F8 5 o o MOC3883 1K MOC3 63 MT2 2 2NG346A BE ACCOMPLISHED ONLY WITH ADEQUATE PROVISION TO PREVENT p 12 1 5 a ga EQUIV ELECTROSTATIC DISCHARGE DAMAGE 2 i 5 NC 2 5 cia 3 F 2 4 y E tus NC 2 01 402 wl 619 a 4 5 BK 5W 3 4 J 200 wc D9 NC 4 IN749A L 1 A 12 us R22 R20 1 3K 5 1M ca eg RC 1 5 SS 338 35v si i R 3 2 i 5 Es gt S 7 R6 o 8 2K 5W TEE 3 4 NC 4 9 VR 2 Figure 27 Power Supply Board Schematic sheet 1 of 4 69 MTA7912 Service Manual Control Display Board Schematic 1 of 2 TO POWER SUPPLY BOARD CONNECTOR J4
56. ROL or BLANKET CONTROL modes The control latch U51 on the control display board is the interface between the main microcontroller via the data bus at address OFF7FH and the peripheral drivers on the power supply board Interface circuitry on the power supply board consists of U1 U2 U7 U8 Q3 Q4 Q8 Q9 and associated components U1 U2 U7 and U8 are optically coupled triac drivers used to control their respective triacs Q3 Q4 Q8 and Q9 these combinations provide electrical isolation between the low voltage main 14 microcontroller control circuits and the line voltage circuits The heater pump hot solenoid valve and cold solenoid valve are individually controlled by the main microcontroller through latch U51 on the control display board A high signal on the data line from the main microcontroller causes a low signal on the appropriate output line of U51 which then sinks current from the power supply board to activate the peripheral devices Pin 11 of U51 on the control display board and U8 and Q9 of the power supply board control the cold solenoid valve while pin 9 of U51 on the control display board and U7 and Q8 of the power supply board control the hot solenoid valve Pin 8 of U51 on the control display board and U2 and Q4 of the power supply board control the circulating pump Pin 7 of U51 on the control display board and U1 and Q3 of the power supply board control power to the heater 6 4 6 Cold Water Reservoir T
57. ailure Contact your local dealer Figure 10C RFU Codes 2 3 E and L 29 Troubleshooting Charts MTA7912 Service Manual RFU CODE 4 RFU CODE 5 Compensation resistor 1 Compensation resistor 1 R12 on control display R12 on control display board reading is too high board reading is too low Measure R12 resistance Is it 816 ohms 0 1 No Replace R12 Yes Suspect temperature measurement circuitry Repair replace the control display board Figure 10D RFU Codes 4 5 30 MTA7912 Service Manual Troubleshooting Charts RFU CODE 6 RFU CODE 7 Compensation resistor 2 Compensation resistor 2 R13 on control display R13 on control display board reading is too high board reading is too low Measure R13 resistance Is it 7320 ohms 0 1 No Replace R13 Yes Suspect temperature measurement circuitry Repair replace the control display board Figure 10E RFU Codes 6 7 31 Troubleshooting Charts MTA7912 Service Manual RFU CODE 8 Water temperature probe reading faulty Insure integrity of control display board to power supply board connections Insure integrity of base to power supply board connections ls it between 811 and 7355 ohms Suspect temperature measurement circuitry Run machine If RFU condition RFU Code 8 reappears unplug machine and measure resistance between pins 10 and 11 of J1 on back of control display board Disconnec
58. aning and Storage Procedures Fluid System To clean the outside of a reusable blanket 1 Manually clean both sides of the blanket on a flat surface with warm water a mild commercial detergent and a sponge or cloth 2 Thoroughly rinse with clean water for 30 seconds 3 Air dry or wipe with a clean cloth 4 Apply a disinfectant such as a 10 chlorinated bleach solution chlorinated bleach with 5 2596 sodium hypochlorite to both sides of the blanket 5 Allow to air dry Solution contact time is what makes disinfection effective NOTE Excess solution pooled in the buttons can be removed with a clean dry cloth Functional Check Safety Inspection and Maintenance MTA7912 Service Manual 6 Loosely roll up the blanket and store for next use Reusable blankets can be cleaned and reused so long as they do not crack or leak 7 2 3 Probe Care REUSABLE PROBES For cleaning disinfecting and sterilizing reusable Gaymar probes or equivalent YSI 400 series reusable probes refer to the instructions provided with the probe DISPOSABLE PROBES Gaymar disposable probes should be discarded after use 7 24 Probe Check Well Care protective S sheath Figure 6 Probe Check Well The PROBE CHECK WELL should be cleaned with a small tubular brush as outlined in section 7 2 1 Machine Cleaning 7 2 5 Quick Disconnects The quick disconnects joining the connector hose to the machine may become difficult to
59. ates that S2 has tripped Record the temperature at which S2 tripped on the Inspection Form Turn the machine off and unplug the power cord Disconnect supply hose from TPT9 flowmeter and allow water to gravity drain into a container for approximately one minute This will MTA7912 Service Manual Functional Check and Safety Inspection circulate cold water from the reservoir past the thermostat causing it to reset Reconnect supply hose and return drained water to machine reservoir 12 Reconnect the 6 conductor cable harness connector P11 to the alarm backup board See figure 14 13 Reconnect the 7 conductor cable harness connector P12 to the alarm backup board See figure 14 k2 RT3 Over Temperature Probe Trip Temperature 1 Unplug the power cord 2 Remove the six screws holding the top assembly head to the machine base Carefully lift the head and position it on its side so that you can see DS1 on the alarm backup board fig 14 p 53 3 Connect test setup as shown in figure 17A B p 56 4 Plug the machine in 5 Place the machine in service mode 3 Refer to section 8 1 Service Modes pp 23 25 for instructions 6 To insure the correct measurement of the RT3 trip point run the machine for 15 minutes after the water temperature has reached 41 C This allows the inside of the machine to achieve normal operating temperature 7 Enter service mode 4 see section 8 1 pp 23 26 from service mode 3 Mod
60. ble Pediatric Patient Probe 3 meters Rectal Esophageal REF PAT108CE Reusable Patient Probe 3 meters Skin Surface MTA7912 Service Manual REF DP400CE Disposable Adult and Pediatric Patient Probe 0 9 meter Rectal Esophageal requires ADP10CE Adaptor Cable REFADP10CE Reusable Probe Adaptor Cable 3 meters 1012 40005 Probe These Gaymar probes adapters and hoses should be used only with Gaymar Hyper Hypothermia Machines ADP10CE DP400CE 0 e Figure 3 Disposable Probe Reusable Adaptor Cable MTA7912 Service Manual Medi Therm 111 System Water Fill Opening Patient Probe Jack Lift cover Fill unit with Accepts patient probe plug connecting patient distilled water until green probe to machine Use only Gaymar probes band on float is fully visible or equivalent YSI 400 series probes approved for use with medical devices control panel Gaymar probe or equivalent YSI AA 400 series probe approved for use lt with medical devices Hyper Hypothermia blanket body wrap ING DBK35CE connector hose Medi Therm 111 machine ON OFF Switch Circuit Breaker Controls power to Medi Therm Ill Dual Blanket Body Wrap Connections with Quick disconnects and Probe Check Well Use PROBE CHECK well to verify the integrity of the patient probe Clik Tite connector Clik Tite connectors and Quick disconnects e rebresentative hose clambs on machine end
61. ce Manual Control Display Board Schematic 2 of 2 TO ALARM BACKUP
62. code RFU REMOVE FROM USE NOW 8 2 RT3 Indicator LED For troubleshooting purposes there is an indicator LED located on the alarm backup board which will light when the RT3 overtemperature probe is sensing a temperature above that which is represented by the fixed precision resistor value R11 See figure 14 p 53 for LED location The PIC microcontroller on the alarm backup board will command a REMOVE FROM USE NOW shutdown after this condition exists for 5 seconds 8 3 Test Mode for the User The MTA7912 provides the operator with the ability to confirm operation of backup system 1 without having to open up the machine The instructions from the Operator s Manual are repeated here for information This test does not test the trip point Perform section k of 7 3 Functional Check and Safety Inspection to insure correct High Temperature Backup Trip Temperatures NOTE Because the test mode heats water above 41 C to protect the patient this mode will not function if the hoses are connected to the unit The test mode operation relies on water flowing through the bypass within the machine See figures 15A and 15B NOTE Each time the TEST Mode is performed and backup system 1 trips an is stored as the last RFU code 8 4 Overtemp Verification Test Perform the following test to verify operation of the first overtemp safety backup without having to open up the machine 1 Disconnect the hoses from the SUPPLY
63. connected to the patient probe jack on the front of the unit In PATIENT CONTROL mode the Medi Therm Ill machine automatically regulates the patient s temperature to the selected SET POINT The machine constantly compares actual patient temperature with the SET POINT value and automatically adjusts the water temperature so that the desired patient temperature is achieved In MONITOR ONLY mode the operator can monitor patient temperature through the patient probe without providing therapy Hyperthermia hypothermia blankets body wraps may be placed either under over or around the patient depending upon the type of procedure Two gray hose sets are provided to connect multiple blankets and or body wraps in order to provide more body surface contact Increasing body surface contact facilitates more efficient warming cooling In the event of a power loss a battery backup circuit will light the POWER LOSS light and sound the audible alarm Upon restoring power the mode of operation and the set points will have to be reselected 6 1 Theory Medi Therm III Machine Whenever the machine is on 9 5 liters of water are maintained cold in the cold water reservoir A cold water reservoir probe provides temperature feedback to the main microcontroller which cycles the refrigeration unit on at 5 8 C and off at 3 3 C When the water requires cooling water is pumped from the cold water reservoir When the water requires heating a cartridge
64. dible the main microcontroller may perform The shutdown condition by the main microcontroller program will remain until the machine is powered down If upon machine turn on the fault condition still exists power replaced to the REMOVE FROM USE NOW circuits on the power supply board when a 15 Theory of Operation MTA7912 Service Manual mode is selected or automatically every 60 seconds in standby mode will cause the REMOVE FROM USE NOW condition to recur 6 4 7 7 Other REMOVE FROM USE NOW Shutdown Conditions If during normal operation the main microcontroller senses internal problems it will cause a machine shutdown condition as in 6 4 7 6 As a precaution it also sends an output signal from port pin P3 4 through U40 on the control display board to command via Q11 and U6 on the power supply board a REMOVE FROM USE NOW shutdown condition of the latches The appropriate RFU Remove From Use code for the shutdown will be stored See section 8 0 6 48 Power Loss The PIC microcontroller also provides the POWER LOSS detection function The Q1 linear regulator is provided voltage also from an 8 4V nominal nickel metal hydride battery when the auxiliary switch of the circuit breaker CB1 is closed indicating the circuit breaker is in the on position and the main microcontroller power supply circuits are not powered The PIC microcontroller detects this POWER LOSS condition via the optical coupler U3 which is tied to the main
65. doesn t the battery may have self discharged due to nonuse While the machine operates it trickle charges the battery which powers this function Operating the machine for four hours will recharge the battery sufficiently to allow 10 minutes of POWER LOSS INDICATOR operation If the battery does not recharge replace it Dispose of battery See the alarm backup board parts list p 67 A WARNING Replace with a rechargeable battery only type V7 8H Nickel Hydride 8 4 V nominal 150 mAh Otherwise battery damage may occur f Condition of Lights and Alarm Plug in the Medi Therm 111 machine and turn it on Press and hold the TEST LIGHTS button The right and left halves of the display panel should light and blank alternately along with the audible alarm The three status legends FLOW OK WARMING and COOLING the ALERT legend and its four triangular indicators and the three mode legends and SELECT heading should be lit The three temperature displays should indicate 88 8 88 8 and 88 8 The two lines connecting SET POINT to both the WATER TEMPERATURE and PATIENT TEMPERATURE display should be lit The audible alarm should sound Replace any LED s which do not light g Flow To measure the machine s flow rate and check the flow switch actuation perform the following 1 Fill machine with distilled water until green band on float stem is fully visible 2 Connect the test setup shown in figure 17A B p
66. e 4 will cause the machine to heat up until RT3 trips Monitor 251 and the measured temperature When 251 lights approximately 5 seconds later the REMOVE FROM USE NOW LED s should light and the audible alarm should sound This indicates RT3 has tripped Verify that the measured temperature is within the limits listed on the Inspection Form for RT3 and record the temperature on the form 8 Turn the machine off and unplug the power cord Disconnect the supply hose from TPT9 flowmeter and allow water to gravity drain into a container for approximately one minute This will circulate cold water from the reservoir past the thermostat causing it to reset Reconnect supply hose and return drained water to machine reservoir 9 Replace the head on the base Replace the six screws I Patient Temperature Display Test To check the patient temperature display perform the following 1 Fill machine with distilled water until green band on float stem is fully visible 2 Connecta resistance of 1355 ohms to the patient probe jack to simulate a 37 C patient temperature 3 Turn machine on and set it in the BLANKET CONTROL mode 4 The PATIENT Temperature Display should indicate 37 C 0 2 C Record appropriate value on nspection Form m Grounding Resistance Use an ohmmeter to measure the resistance between the grounding pin on the line cord attachment plug and an exposed metal point on the chassis The value should be less than 0 5 oh
67. e barbed adapters item D Remove piston Clean all parts with alcohol and remove any foreign matter a de c y To reassemble reverse steps 1 through 3 above Ensure that the piston is replaced into the flow switch housing with its round disk side oriented down MTA7912 Service Manual Repair Procedures Piston Figure 12 Flow Switch 9 8 Replacement Parts For base replacement parts information see figure 19 pp 58 59 For head replacement parts information see figure 20 p 60 Repairs should only be performed by qualified personnel familiar with repair practices for servicing medical devices 9 9 Shipping Repackaging Instructions A C AUTION Failure to install compressor shipping braces before shipment can result in extensive damage to the refrigeration section See page 74 figure B See figure 30 p 74 for complete shipping repackaging instructions 51 Service Information MTA7912 Service Manual 10 0 Service Information PATIENT PROBE WATER TEMPERATURE PROBE RT2 RESERVOIR PROBE RT1 AND OVER TEMPERATURE PROBE RT3 TEMPERATURE RESISTANCE TEMPERATURE RESISTANCE TEMPERATURE RESISTANCE C OHMS C OHMS 0 26 7355 2156 6989 27 2064 6644 28 1977 6319 29 1894 6011 30 1815 5719 31 1739 5444 32 1667 5183 33 1599 34 1533 35 1471 36 1412 37 1355 38 1301 39 1249 40 1200 41 1152 42 1107 43 1064 44 1023 45 983 8 46 946 2 910 2 875 8 842
68. ection Disconnect hot solenoid SV2 Measure coil resistance for short ls optocoupler U7 input pulled low ls hot solenoid coil SV2 shorted power supply board Repair No Yes Suspect Q9 or U8 ls pin 9 refto pin 10 of U51 0 VDC Suspect board to board Repair replace hot connection solenoid SV2 Repair Repair or replace power supply board No Suspect Assume Q8 triac board to board is also damaged Repair replace power supply board Suspect connection control display board Repair Repair replace Figure 10M Blanket Body Wrap Won t Heat in PATIENT CONTROL or BLANKET CONTROL Mode 42 MTA7912 Service Manual Troubleshooting Charts NOTES The line voltage measured should be the same as that measured across terminals 4 and 3 of TB1 There may be residual voltage between terminals 2 and 3 or terminals 1 and 3 of TB1 when the circuitry is in the OFF state because of the solenoid valve construction and circuit configuration These are not considered line voltage The solenoid coil can be tested with a multimeter set to the diode check function With the power off measure the diode drop across the terminals of the solenoid coil in both directions There should be an open circuit in one direction and approximately 0 8V in the other If not the solenoid valve is bad and should be replaced Check heater it should be on Check cold solenoid SV1 it should be
69. ed warranties including but not limited to the implied warranties of merchantability and of fitness for a particular purpose 27 Warranty Repairs All in warranty field repairs must be authorized by Gaymar s Export Department before proceeding 2 9 Out of Warranty Repairs The following repair options are available when local machine servicing is elected I Defective Component Replacement parts can be ordered from your local dealer Specify the Gaymar part number refer to the Parts Lists in section 10 0 of this manual 2 Defective Printed Circuit PC Board Defective PC boards can be exchanged for replacement boards at a fixed cost directly from your local dealer 3 Defective Head The defective head module can be returned without base for repair Contact your local dealer for information 4 Machine Repairs If the Medi Therm Ill machine becomes defective and the cause of the problem cannot be determined the complete machine can be returned to your local dealer for servicing at the purchaser s expense This normally represents the most expensive repair option Contact your local dealer MTA7912 Service Manual Specifications 3 0 Specifications 3 1 Physical Physical Specifications MTA7912 Dimensions 94 cm high x 48 cm deep x 36 cm wide Weight 76 3 kg full 68 6 kg empty Normal Reservoir Operating Volume Operating Ambient Temperature Range Power Loss Indicator Battery Fuse stepdown transformer 3 2 The
70. emperature Control The control latch U51 on the control display board is the interface between the main microcontroller via the data bus at address OFF7FH and the refrigeration compressor relay driver on the power supply board A high signal on the appropriate data line causes a low signal at pin 6 of U51 on the control display board which then activates Q12 on the power supply board Q12 on the power supply board is the interface between the control display board and the coil of the power relay K1 located in the machine base The main microcontroller switches power through the relay to the refrigeration compressor at cut out and cut in temperatures of 3 3 C and 5 870 These temperatures are sensed by the cold water reservoir probe RTI located in the water reservoir See figure 16 p 55 Control of the cold water reservoir temperature takes place whenever the machine is on 6 4 7 Backup Water Temperature Limiting Water temperature limiting is provided by two systems Backup System and Backup System Il Backup System consists of a PIC microcontroller residing on the alarm backup board the over temperature probe RT3 located in the base and one of the REMOVE FROM USE NOW latching circuits on the power supply board Backup System consists of two REMOVE FROM USE NOW latching circuits and two fixed non adjustable temperature limit thermostats S1 and S2 located in the base 6 4 7 1 REMOVE FROM USE NOW Latching Circuits The po
71. engage This problem can be prevented by periodically applying a silicone base or light machine oil to the outside of the male connector prior to engagement 7 3 Functional Check and Safety Inspection To assure the optimum performance dependability and safety the following should be performed each year or as specified in the facility s preventive maintenance program An Inspection Form is provided at the end of this section to facilitate and document the inspection process Lower case letters preceding the subheadings within section 7 3 correspond to the lines on the Inspection Form A WARNING Always perform the Functional Check and Safety Inspection after making repairs and before returning the Medi Therm 111 machine to patient use Improper repair may result in death or serious injury equipment damage or malfunction REQUIRED TEST EQUIPMENT The following test equipment or equivalent is required to perform the preventive maintenance functional check procedures GAYMAR TPT9 Flowmeter Temperature Tester T GAYMAR TFC1 Thermometer 5170 accuracy 2 C to 52 C range T T Asan alternative to the above TPT9 and TFC1 test equipment you may use a liguid flow meter with a measurement range of 10 to 75 liters per hour and an accuracy of 5 of full scale and aninline fluid temperature sensor with a measure ment range of 0 to 50 C and an accuracy of 1 C GAYMAR 08 3505 Blanket Body Wrap Connector
72. istilled water until the green band is fully visible Verify that the ADD WATER indicator goes out Cold Water Reservoir Controller To check the cold water reservoir controller perform the following 1 j Fill machine with distilled water until green band on float stem is fully visible Connect the test setup shown in figure 17A B p 56 NOTE To minimize the test time for this test only remove the blanket from the flow path shown in figures 17A 17B Turn machine on and push the BLANKET CONTROL mode button Set the Temperature Setpoint to 4 C Verify that the machine can supply water anywhere within the 3 C to 6 C range as measured and that the compressor turns off one time This will take 15 30 minutes depending upon room temperature and other conditions The use of a blanket for this test can extend this time up to 60 minutes Water Temperature Controller and Display Test To check the temperature controller perform the following 1 20 Fill machine with distilled water until green band on float stem is fully visible k Connect the test setup shown in figure 17A B p 56 Turn machine on Set in BLANKET CONTROL mode Set the Temperature Setpoint to the various settings specified on the Inspection Form fig 7 p 22 wait until both the WARMING and COOLING lights turn off and the water temperature stabilizes then record the measured temperature and that shown on the display Verify that the
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74. l 5E 15 MAN RNI F ANS G 26 za EN UB A 27 57 7 27 57 B 1 2 3 231415 37 07606 ULN2803AN YELLOW usa GREEN RFU IN 1 16 1 15 HLMP 2885 16 Jo EF 4 lan as ET n nl Ap A7 BWA ADDRESS 505 n FROM A A A 4 MICROPROCESSOR 5 12 5 12 SECTION BLANKET ui2 RNI A RNI D j A 1 4 SHEET 2 HDSP 5551 15 27 57 d d T Mee q 7 7 10 5v C2 NC r 9 e 7 5 YELLOW us u28 e a 5 ICM7212 1 1 8 HLMP 2755 7K 1 8 HLMP 2755 4 4 4 nm 37 m a Iz m 8 UB2 A U52 8 We MM 4 UB2 G 4 ULN2883AN ULN2 3AN 8 s 3 n ULN2003AN a n ww 2s C rag Y l Y sv 288 nk 4 t 5 c7 4 5 DBI El RN3 B RN3 A RN3 C USB D E 5y l 5v sv 282 nt 1 2 3 4 5 ULN2883AN UH Buh 27 87 3 27 87 2 T 27 87 4 283 61 ys m h a mwm 4 13 MACH 7 10 ale Uu De wi u29 GREEN uia GREEN U47 GREEN 28 7 125 5551 8 HLMP 2558 HLMP 2558 HLMP 2558 821 RNI B i Cl NE 5v 27 4 3 Ej Dt 12 3 la 7 5 gt We 1 E2 hz a a a DSI ke YELLOW usa K A y pe 82 1 8 HLMP 2755 5 13 5 5 5 T BRT A ha 160 12 7 ga pe 5 i A U52 F a U62 E F 4 U62 D e ULN2003AN ULN2B823AN ULN2GASAN 16 D3 VISTA TS 4 5 AUTO 6 7 MAN 5 12 7 MON 4 13 7 7 Sl UB E I r gt E Y gt E Y v F3 2 BE U14 ULN2883AN AUTO PATIENT MAN BLANKET HDSP 5551 Geen ih H CONTROL MODE CONTROL MODE M Se NC V BE CLK gp DISPLAY
75. l pull its buffer input line low when it senses sufficient flow The probe presence switch within J1 will pull its buffer input line low when it senses the presence of the patient probe Pressing the service mode switch S3 on the control display board will pull its buffer input line low Pressing this switch while powering up the machine will cause the machine to execute code which implements several service modes for troubleshooting use 6 4 5 Water Patient Temperature Control If the machine is in BLANKET CONTROL mode the water temperature as sensed by the water temperature probe is used as the feedback signal for controlling the water temperature to the BLANKET CONTROL mode set point temperature If the machine is in PATIENT CONTROL mode the patient temperature as sensed by the patient probe connected to the patient probe jack is used as the feedback signal for controlling the patient temperature to the PATIENT CONTROL mode set point temperature The machine accomplishes this by adjusting the water temperature The water temperature the machine uses in PATIENT CONTROL mode is dependent on the CONTROL OPTION setting selected and if COOLING or WARMING is desired When COOLING the patient RAPID the coldest water is used for cooling as low as 4 C This may not be the most comfortable setting for the patient MODERATE Water temperature is limted 10 1570 below the patient s temperature This will provide an improved comfort se
76. ld water reservoir is controlled by the main microcontroller The microcontroller senses the temperature with a cold water reservoir probe and cycles the compressor relay on and off BACKUP SYSTEMS Backup systems within the Medi Therm III machine limit the temperature of water exiting the machine to specified ranges in the event of a failure of the control system including the main controller BACKUP SYSTEM I PIC Microcontroller and probe The first backup system is independent of the main microcontroller It runs off its own power supply It limits the temperature of water exiting the machine in the event of a failure of control circuitry including the main microcontroller Using an overtemperature probe in the same water path as the main microcontroller water temperature probe water temperature is sensed When limit temperatures are surpassed the PIC sends a signal to trigger an analog REMOVE FROM USE NOW circuit which shuts down the pump and heater lights the ALERT and the REMOVE FROM USE NOW indicators and sounds the audible alarm In addition if the main microcontroller is operational the compressor shuts down the displays blank and the ALERT indicator and audible alarm turn on and off The power supply for this system is backed with a nickel hydride battery to provide a minimum 10 minute audible and visual POWER LOSS indication in the event of power failure BACKUP SYSTEM Thermostats The second
77. ling see figs 15A and 15B p 54 REFRIGERATION UNIT The refrigeration circuit see fig 16 p 55 consists of two heat exchangers operating at two pressures and two devices used to change these pressures The first of these devices is the compressor which changes the gas pressure from low to high The other device is the capillary tube which reduces the refrigerant pressure from high to low Beginning the cycle at the capillary tube high pressure liquid refrigerant flows in the capillary tube and is discharged into the evaporator coil The evaporator coil which is a heat exchanger receives the refrigerant as a mixture of liquid and vapor at a MTA7912 Service Manual Theory of Operation pressure low enough so that it boils and absorbs heat from the water surrounding it The heated refrigerant vapor then leaves the evaporator coils enters the suction side of the compressor and is compressed causing its pressure and temperature to increase The vapor much warmer than the ambient air travels to the condenser The condenser is the other heat exchanger The condenser fan draws the colder ambient air over the condenser coils and removes the heat being carried by the refrigerant and causes it to condense back into liquid refrigerant This completes the cycle and the high pressure liquid refrigerant is returned to the capillary tube to be used over again The temperature of the water surrounding the evaporator coil in the co
78. may result Do not overfill Overfilling may result in overflow because the water in the blanket body wrap drains back into the machine when the machine is turned off For grounding reliability plug the Medi Therm Ill machine only into a properly grounded outlet To prevent damage to the power cord always keep the power cord retainer in place Repairs Warranty MTA7912 Service Manual 2 0 Repair Policy 24 Return Authorization For customers who repair Gaymar Medi Therm 111 machines at Please contact your local dealer their location this manual contains information to allow a qualified biomedical technician familiar with practices for servicing medical devices to make necessary repairs Service training for the Hyper Hypothermia machine is recommended and can be arranged through your local dealer 24 Limited Warranty The Medi Therm Ill Hyper Hypothermia machine is warranted free of defects in material and workmanship for a period of two 2 years under the terms and conditions of the Gaymar warranty in place at the time of purchase The compressor portion of the machine carries a five year prorated warranty During the warranty period contact your local dealer Warranty does not cover products abused misused or altered outside the factory There are no obligations on the part of Gaymar for consequential damages arising out of or in connection with the use or performance of the product Gaymar disclaims all impli
79. ms n Current Leakage Current Leakage EARTH Measure and record the maximum earth current leakage ground open Measure all combinations of line polarity neutral closed open Measure in all operating configurations heating cooling compressor on compressor off in the neutral closed test The leakage values should not exceed those listed on the Inspection Form Current Leakage PATIENT PROBE Measure and record PATIENT PROBE leakage current It is first necessary to prepare a patient probe by wrapping it tightly along its entire length with metal foil Measure current leakage at the foil for all combinations of line polarity neutral closed open The leakage values should not exceed those listed on the Inspection Form o Resetthe RFU Code The Medi Therm 111 machine will retain the previously stored code Before returning a machine to service reset the RFU code to zero so that a previous code is not held in memory To reset the RFU code to zero 1 Place the machine in service mode 1 see section 8 1 pp 23 and 25 2 Pressthe TEST LIGHTS button on the control panel The RFU code is reset when the number on the water temperature display shows 0 This completes the recommended functional test and preventive maintenance procedures for the Gaymar Medi Therm III If a machine passes all the requirements of paragraphs a through o the machine should be considered operational and suitable for return
80. n the U S Patent and Trademark Office Gaymar Clik Tite and Medi Therm are trademarks of Gaymar Industries Inc 6 2009 Gaymar Industries Inc All rights reserved CONDO RODA Table of Contents Safety Precautions Repair Policy cen 2 Specifications Blankets Body Wraps Accessories Operator Control Panel Theory of Operation Functional Check Safety Inspection and Preventive Maintenance Service Modes and Troubleshooting Repair Procedures Service Information Figures Water Warm up Rate Water Cooldown Rate Disposable Probe Reusable Cable Medi Therm III System Medi Therm III Control Panel Probe Check Well Functional Check Inspection Form Initiating Service Mode 1 RFU Codes Troubleshooting Charts Connecting Terminal Block Wires Flow Switch Temperature vs Resistance Table Circuit Boards Connectors Head Heating Flow Cooling Flow Refrigeration Flow Diagram Test Setup Test Setup alternate Machine Disassembly Parts Diagram Base Parts List Parts Diagram Head Parts List Thermostat Wiring Diagram Control Display Board Parts List Power Supply Board Parts List Alarm Backup Board Parts List Wiring Diagram foldout Power Supply Board Schematic 1 of 4 foldout Control Display Board Schematic 2 of 4 foldout Control Diplay Board Schematic 3 of 4 foldout Alarm Backup Board Schematic 4 of 4 foldout Shipping Instructions foldout 74 MTA7912 Service Manual
81. ne regardless of the main microcontroller operational status These commanded signals by the PIC microcontroller will remain until the machine is powered down U4 prevents Q1 from turning on so full line voltage will appear between J1 2 and J1 3 In this case U5 and U10 will be turned on by the action of R4 D3 and associated parts while U3 and U9 will be turned on by the action of R6 D2 and associated parts U5 prevents Q2 from turning on and U3 prevents Q1 from turning on even if the PIC command signal is removed The output of either U9 or U10 through buffer Q10 signals the main microcontroller that a REMOVE FROM USE NOW condition has resulted Thus should the PIC microcontroller sense an over temperature condition the heater and pump are shut off and the main microcontroller is notified 6 4 7 3 Backup System I If the water falls into the low temperature limit range S1 will open If the water temperature rises into the high temperature range S2 will open see section 3 2 Thermal Specifications page 3 for the high and low temperature limits When either of these thermostats opens it directly interrupts the circuit and shuts off the pump and heater at the same time full line voltage will appear between J1 2 and J1 3 In this case U5 and U10 will be turned on by the action of R4 D3 and associated parts while U3 and U9 will be turned on by the action of R6 D2 and associated parts U5 prevents Q2 from turning on and U
82. nt air when servicing Moisture absorption will result in reduced compressor life Do not attempt servicing the R 134a refrigeration system unless you are certified in R 134a refrigeration maintenance repair and reclaiming procedures Supply the following information to the refrigeration service technician The smaller molecular size of R 134a refrigerant allows it to leak from smaller openings Prior to charging the system Gaymar recommends evacuating the system to below 500 microns Then perform a vacuum decay test to assure there is not a large differential between the system and the vacuum pump After 5 minutes the system should still be at 500 microns or below For optimum performance charge the R 134a system with 0 234kg 8 250z of R 134a refrigerant Make sure that the entire 0 234kg charge is pulled from the gauge manifold and hoses into the system before disconnecting If it is necessary to check a unit s charge purge the refrigerant gauge manifold and hoses with R 134a refrigerant from an external source before opening the service valves to prevent affecting the unit s charge In a properly charged unit the low side refrigerant gauge pressure should be approximately 83 131 kPa 12 19 PSI the high side pressure should be approximately 758 848 kPa 110 123 PSI The approximate gauge pressures will be observed under the following conditions 1 the unit s wraparound is removed 2 the ambient temperature i
83. of turning the machine circuit breaker off If upon machine turn on the fault condition still exists the REMOVE FROM USE NOW condition will recur 6 4 7 6 If the Main Microcontroller is Operational If the main microcontroller is operational at the event of a high signal from Q10 of the power supply board originating from BACKUP SYSTEM or BACKUP SYSTEM Il the signal at P3 2 causes the main microcontroller to shut off the 7 segment displays flash the ALERT LED and light the REMOVE FROM USE NOW LED toggle the audible alarm store the appropriate RFU Remove From Use code indicating the reason for the shutdown turn off the heater and pump triacs Q3 and Q4 turn off the solenoid triacs Q8 and Q9 and turn off the compressor transistor Q12 Separate machine service modes allow for viewing the RFU code and for debugging problems See section 8 0 The process of turning off the heater and pump triacs Q3 and Q4 by the main microcontroller removes power from the REMOVE FROM USE NOW circuitry on the power board which then allows the indicators on the control display board to toggle under main microcontroller control Note The audible alarm will be a continuous tone for an over temperature condition sensed by BACKUP SYSTEM 1 regardless of the operational status of the main microcontroller since the PIC microcontroller puts out a continuous signal to the audible independently which does not get reset and which overrides any pulsing of the au
84. off Measure resistance of heater Refer to power supply board schematic fig 26 for heater resistance Line voltage at terminals 11 and 8 of TB1 Suspect cold solenoid SV1 may be Line voltage at terminals 1 and 3 of TB1 Suspect Line base to power supply voltage at output board connection of 03 Repair Stuck open or hot solenoid SV2 may be stuck closed Yes No ls optocoupler U1 input pulled too low Suspect Q3 or U1 Disassemble solenoids Clean inspect seats repair replace Line voltage at output of Q9 Replace heater No Repair replace power supply board Yes No ls pin 7 ref to pin 10 of U51 0 VDC Suspect board to board connection Repair ls optocoupler U8 input pulled low Suspect control display board Repair replace No Yes ls pin 11 ref to pin 10 of U51 0 VDC Suspect control display board Repair replace No 43 MTA7912 Service Manual Troubleshooting Charts yo eq pinoys y je abeyon aul Jejeay e AS 000909 pipo 908 68 1869 Z 40 288 5 NOL 8116 1009 LON TIM dv M 1608 1216 88S Buiuuni eq pinous y 6761090 1090 10 9 9 6111819609 1011999 S Jung 919 9 0181909 ZLY pedsns SI 5010811000 196090000 901800 00189091 SU 150 ABU Aew 9171819009 09 0 1561
85. or 10615 000 Relay Item 24 18 Overtemp Probe RT3 Kit 78187 000 32 Filter Choke Noir Shown located nextto 100617 000 Isolation Transformer Item 4 Parts List ITEM 1 POWER CORD PCO01 2 0003 4 ITEM DESCRIPTION 5 PC001 Power Cord Continental Europe 0002 Power Cord United Kingdom PC003 Power Cord Australia 0004 Power Cord Switzerland PC005 6 0007 0008 Power Cord Italy PC006 Power Cord Denmark PC007 Power Cord Israel 59 Service Information MTA7912 Service Manual 32 33 i 34 r P 5 a MACHINE STATUS C1 i i 35 36 51 52 C Yi j 4 53 V GAY MAR MEDI THERM IH 54 e Bel O Co E id MN ela 8 k L 57 56 PART ITEM DESCRIPTION NUMBER 55 PART ITEM DESCRIPTION NUMBER La fa uen HETTA Figure 20 Parts Diagram Head Parts List 60 MTA7912 Service Manual Service Information S2 S1 dh NOTE Positions 8 and 9 of TB1 are connected together Cold f Hot MN IN VIOLET z mA YELLOW L c JE
86. or cable harness connector P12 from the alarm backup board 3 Disconnect the 26 conductor cable harness connector P3 from the power supply board 4 Disconnect the three cable harness connectors P5 P6 and P7 5 Remove the seven 7 board mounting screws 6 Liftboard out of head 9 2 2 Power Supply Board Installation see fig 14 p 53 1 Unplug the power cord 2 Place the new power supply board in head 3 Install seven 7 board mounting screws 4 Connect the three cable harness connectors P5 P6 and P7 to J3 J2 and J1 on the power supply board 5 Perform a voltage check of the power supply board Do not use the board or connect it to the control display board if the voltages are incorrect NOTE To prevent an accidental short circuit connect voltmeter leads while the machine is off With the 26 conductor cable harness assembly disconnected from the power supply board and the machine on measure for the following voltages at the following board locations see figure 23 p 64 DVM DVM Common Lead Voltage to Pin to Pin Reading Q7 1 3 12 0 5V Q6 2 3 12 0 5V C16 5 3 0 3V 6 Turn machine off T Connect the 26 conductor cable assembly 48 8 9 9 3 Connect the 7 conductor cable harness connector P12 to the alarm backup board Perform the Functional Check and Safety Inspection section 7 3 Replacing the Alarm Backup Board Wear a static control device connected to
87. orite Bleach will damage the heating element in the machine which could result in excessive leakage current COMPRESSOR Dirt that has accumulated on the condenser coils and cooling fins within the machine will reduce the efficiency of the compressor and should be removed with a vacuum cleaner or compressed air hose This will require removal of the rear baffle assembly This should be checked monthly or more frequently depending upon use See figure 18 p 57 PUMP Pump motor should be oiled once a year with 3 4 drops of general purpose motor oil in the locations identified on the pump label 7 2 1 Machine Cleaning A CAUTION Users should not use cleaning or decontamination methods different from those recommended To clean the external surfaces of the machine and connector hose use a nonabrasive cleaning solution such as warm soapy water and a clean cloth Wipe or air dry Apply a disinfectant such as 10 chlorinated bleach solution chlorinated bleach with 5 25 sodium hypochlorite to the external surfaces and allow to dry Do not use bleach within the machine 7 2 2 Reusable Blanket Care A CAUTION Do not store filled blankets Algae growth may occur inside Do not use a blanket if severe algae buildup occurs Do not expose blankets to temperatures over 65 C REUSABLE BLANKETS To clean inside reusable blankets attach the blankets to the machine and follow instructions for section 7 2 Cle
88. ptable limits of the set point temperature It is accompanied by an audible alarm See section 3 2 for explanations of the various alarms that have a flashing temperature display POWER LOSS INDICATOR lights when power is removed and ON OFF circuit breaker is ON located on front of machine MTA7912 Service Manual Operator Control Panel SGAYMAR MEDI THERM Ill AY TEN v Figure 5 Medi Therm III Control Panel SELECT MODE D lt TEMPERATURE Cn BLANKET CONTROL WATER TEMPERATURE NS Adjust SET POINT to control water This display lights when either PATIENT temperature CONTROL or BLANKET CONTROL is selected 4 C to 41 C O PATENT CONTROL O PATIENT TEMPERATURE Connect patient probe then adjust As measured by the patient probe ME SET POINT to control patient This display lights whenever a patient probe is temperature plugged in 30 C to 39 C SET POINT CHANGE CONTROL OPTION Press the W or A button to select machine Cooling Warming adjusted to set point When selecting a temperature outside RAPID rate the normothermic range 36 C to 38 C an Cooling Warming adjusted to audible alarm will chime Press and hold the MODERATE rate W or A button until the chime stops to u Cooling Warming adjusted to access the extended temperature range GRADUAL rate OO O MONITOR ONLY PATIENT PROBE JACK Insert only a Gaymar probe or an eq
89. rmal Thermal Specifications High Temperature Limits Fixed 41 1 C to 43 6 C Machine will go into a REMOVE FROM USE Backup System 1 Overtemperature probe RT3 NOW shutdown condition and the alarm will be on High Temperature Limits Fixed 44 C to 49 C Machine will go into a REMOVE FROM USE Backup System 2 Thermostat S2 NOW shutdown condition and the alarm will be on Low Temperature Limits Fixed 3 0 C to 2 5 C Machine will go into a REMOVE FROM USE Backup System 2 Thermostat S1 NOW shutdown condition and the alarm will be on Add Water Alert Actuation Less than 7 6 liters of water in the cold reservoir Check Patient Alert Activation Temperature Below 29 C or above 40 C whenever probe is used Machine Ceases Therapy whenever probe is used Below 29 C or above 4570 Patient Temperature Control Range for 4 PATIENT CONTROL mode Patient Temperature Control Range for 2 5 BLANKET CONTROL mode PERANG Flashing Temperature Display BLANKET CONTROL MODE Actuates when actual temperature with setpoint 30 C or greater is not within 1 0 C of setpoint 4 hours after powerup 4 hours after a setpoint change or 10 minutes after the first instance of the actual temperature becoming equal to the setpoint PATIENT CONTROL MODE except warming a patient in MODERATE or GRADUAL mode Actuates when actual temperature is not within 0 5 C of setpoint 4 hours after powerup or 4 hours after a setpoint change PATIENT CONTR
90. roubleshooting Charts MTA7912 Service Manual LS eoe doy SO ds jo no 1815090 S ON S se 001001 Jejsouueu aunjesadwiay MO ul pajeoppui se S 159 ON 6066 464188 9171819609 SI S94 S A 8966891 001 0000 NAY 5900 Job 0 jenbe 9101819009 julodjas uj epou TOYLNOD 13111176 ul yun 9181960 SoA 8966891 0010000 NAY 59900 Jejeep 90 ino eg 01 7010 11900916890 9 7 81960 9 JO 919 6 Ionuoo 1178 9 0 9500 Ely Jo 01800 dnyoeq wueje eu 60809 ON ads jo no elu SI Jejsoueu 908 69 S A 9690170 18 5090 ZS SI ON sa uoljounj seinjejeduie du dnyoeg enjereduie DU ui pejeorpul Se ZS 1681 s solo jejsouueu Inun JO 9171819609 Wool 0 009 O pun mov SBA YOIUM euiuuejeq uedo si jejsouueu V ON 69066 4641 seat 91718196019 SI 59 SOA 8966891 01 0000 3 5900 ON DY o jenbe 9171819609 jwodjes 4144 po 708 110 L3MNV TH ul jun 9181960 sesop jyejsouueu jun Jo eynjeJeduje woos wem 0j JUN mojiy uado S Le pJeoq iemod eoe deJ redos 39 Troubleshooting Charts MTA7912 Service Manual Check Check suspect insure WARMING hot solenoid 5 02 solenoids it should be LED is on energized CHECK WATER Adjust setpoint to FLOW alert is on Is a steel object attracted to center top of the valve
91. rvice Manual Service Information FOR GROUNDING PURPOSES Two 2 star washers are reguired with these two screws GAYMAR REMOVING HEAD Disconnect four 4 cable harnesses from power supply board and one 1 cable harness from alarm backup board in head and ground harness from chassis Wraparound Chassis Ground Figure 18 Machine disassembly REMOVING WRAPAROUND Flex side panels of wraparound REMOVING REAR BAFFLE ASSEMBLY Loosen screws at bottom and lift off screws at top out slightly as indicated by arrows A GG AGB MO Inside view of OZ OZ gd chassis wraparound 57 Service Information MTA7912 Service Manual I 1 10 Original ee 1 piece 11 pieces
92. s 22 2 C 3 the unitis connected to a blanket or body wrap and the Medi Therm III has been set to 4 C in BLANKET CONTROL mode 4 the reservoir water temperature is 4 4 C and 5 the pressure check is performed with a gauge manifold connected to the system with flexible hoses Upon completion of the pressure check turn the unit off and allow refrigerant in the manifold and hoses especially the high side to migrate back into the unit before closing the service valves and disconnecting the hoses Warming the hose near the service valve with your hands for 2 3 minutes will ensure this If recharging is required most likely there is a leak in the system Locate and repair any leaks before recharging the unit Replace the two service valve caps and two gauge port caps after servicing the refrigeration system After servicing the refrigeration unit make sure to perform the Functional Check and Safety Inspection see section 7 3 47 Repair Procedures MTA7912 Service Manual 9 2 Replacing the Power Supply Board A C AUTION Wear a static control device connected to the chassis ground to prevent electrostatic discharge See figure 8 page 23 Electrostatic discharge can damage circuitry on PC boards The following procedures describe replacement of the power supply board A digital voltmeter is required 9 2 1 Power Supply Board Removal see figure 14 p 53 1 Unplug the power cord 2 Disconnect the 7 conduct
93. serving proper polarity Connect the 6 conductor cable harness connector P11 to the alarm backup board MTA7912 Service Manual Repair Procedures 7 Connect the 7 conductor cable harness connector P12 to the 9 4 Replacing the Control Display Board alarm backup board 8 Connect the 26 conductor cable harness connector P1 to the A CAUTION alarm backup board Wear a static control device connected to the chassis ground to prevent electrostatic discharge See figure 8 9 Perform the Functional Check and Safety Inspection section 7 3 page 23 Electrostatic discharge can damage circuitry on PC boards 9 4 1 Control Display Board Removal see fig 14 p 53 1 Unplug the power cord 2 Remove the alarm backup board see section 9 3 1 steps 2 8 3 Unfasten the patient probe assembly J1 from the head by removing the hex nut and pull the assembly from its End View End View mounting hole Clamp Open 4 Remove the two 2 board mounting screws and four 4 Figure 11 Connecting disconnecting J3 terminal block wires staridoffs 5 Push aside the ground harness and transformer cable and lift board enough to gain access to the PC board 6 Disconnect the digital control panel from the board at J4 and the patient probe assembly from the board at J2 NOTE These connectors have locking tabs that must be pressed in order to disengage them from the board A C AUTION Use care when disconnecting the digital con
94. set temperature to 4 C drain unit until no water comes out Continue draining by tilting the unit forward and keep it in that position until the unitis completely empty Turn unit off and unplug the power cord Connect Clik Tite connectors together and disconnect the DBK assembly from unit Step 3 Refer to figure A Detach power cord Remove lower wraparound by removing ten 10 screws Step 4 Refer to figure B Insert three 3 shipping braces items 8 9 For two of the braces item 8 use a screw and washer items 10 11 through the housing frame into the shipping brace the third brace item 9 just fits in place Step 5 Refer to figure A Replace lower wraparound and ten 10 screws Step 6 Refer to figure C Place bottom cap item 7 on floor NOTE Steps 7 through 12 will require two 2 people Step 7 Refer to figure C Tape up carton support item 5 as shown using nylon tape item 4 and place on top of bottom cap Step 8 Refer to figure D Place the unit on top of carton support with the wheels oriented as shown Step 9 Refer to figure E Position the four 4 corner supports item 3 on the corners of the unit as shown in the exploded view figure C Ensure ADP10CE cable is unplugged from patient probe jack on MTA7912 NOTE The hole in the left rear corner support must be positioned directly over the cord retainer in the unit base No special positioning is required for the other three corner s
95. t connector P6 from J2 on power supply board Repair replace the control display board Measure resistance between pins 3 and 5 of connector P6 ls it between 811 and 7355 ohms Faulty signal lines between Yes control display board and RT2 No Is RT2 temperature between 0 C and 50 C Suspect RT2 Repair replace No Suspect controller failure caused RT2 to actually read outside 0 C to 50 C range 811 to 7355 ohms Repair replace the control display board Figure 10F RFU Code 8 32 MTA7912 Service Manual Troubleshooting Charts RFU CODE 9 Reservoir probe reading faulty Insure integrity of control display board to power supply board connections Insure integrity of base to power supply board connections Is it between 811 and 7355 ohms Suspect temperature measurement circuitry Run machine If RFU condition RFU Code 9 reappears unplug machine and measure resistance between pins 23 and 11 of J1 on back of control display board Disconnect connector P6 from J2 on power supply board Repair replace the control display board Measure resistance between pins 2 and 9 of connector P6 ls it Faulty signal lines between between 811 and control display board and 7355 ohms RT1 Is RT1 temperature between 0 C and Suspect RT1 Repair replace Yes No Suspect controller failure caused RT1 to actually read outside 0 C to 5
96. t of 5 3 volts DC Q6 is a linear regulator with a nominal output of plus twelve 12 volts DC while Q7 also a linear regulator delivers a nominal output of minus twelve 12 volts DC 6 4 Theory Machine Functions See figure 25 p 68 for system wiring diagram figures 26 28 pp 69 72 for the electrical schematics figures 22 24 pp 62 67 for component layouts and part designations and figure 29 p 73 for the system block diagram The main microcontroller U37 is fully dependent on the code stored in the U31 EPROM When the machine is on the main 12 microcontroller continually cycles through its main program loop to perform the following Thermistor output measurement see section 6 4 1 Digital control panel input section 6 4 2 Display update section 6 4 3 Peripheral input section 6 4 4 p 13 Blanket Patient temperature control section 6 4 5 p 13 Cold water reservoir temperature control section 6 4 6 p 14 Backup water temperature limiting is achieved independently of the microcontroller See section 6 4 7 page 14 6 4 1 Thermistor Output Measurement Temperature measurement is achieved using 400 series thermistor beads located in the water path water temperature probe RT2 the cold water reservoir cold water reservoir probe RT1 and in the patient via the patient probe jack J1 The main microcontroller connects each of the three beads to the current source circuitry U38 and associated
97. tacle Check that the cord retainer is in place Check for blown step down transformer fuse F1 inside machine See figure 19 Figure 10J Machine Doesn t Turn On MTA7912 Service Manual MTA7912 Service Manual Troubleshooting Charts This page has been intentionally left blank 37 MTA7912 Service Manual Troubleshooting Charts E 0 enba nye ede jwodjes Uu epo 7081110 13 1178 Ul yun 9191960 Anuelolyns peuuewpejooo eneu kew wun ON ds jo no Jejsouueu ZS SI 19150090 908 9 se 0010021 seinjejeduie du dnyoeg eunjejeduie Y IH UI 09190001 Se ZS 1581 ON 101 8106 juo yaje uO S Holy MOT S31VM 42370 SI Ha IVMX903HO 998 Jedej Jo Douce se 00 0012 5 78 9609 du dnyoeg 9 78 9609 BI Ul pejeoipul se 1591 anjeJadua 0010 009 0 yun molly SO dnyoeqjuueje Jo Ld Je 09090000 ely S pejoeuuoosip euiooeq sey Jo paddy seu e 1Y 5000099 Jaye 18966861 01 0000 Ne 0 8008151991 S 8 pue 0 Sjeuiuuel L gl S0108 SUYO 81NSE9 Jun umop Jemod SoA 1919 09 1896680 01 0000 N JY 6906 8poN 104 1NO9 134NV18 69910 pue yun dn je od JL ey ur UMOUS Se dnjes sa 109000 jun umop JeMOd eseq wou jeubis uwopinus 0919081 H 3002 N44 pesop ae SJE SOWJ U ainojo MON ISN 1 0 3 0 3 b dsns Figure 10K RFU Code H 38 T
98. temerature and ALERT light will stop flashing and the audible alarm will silence NOTE Ifthe control MODE or SETPOINT is changed while this alarm is occuring the alarm will be reset NOTE Ifthe control MODE or SET POINT is changed while in Auto Gradual or Auto Moderate control mode this may impact the overall time period of the therapy depending on when in the hourly cycle the mode is interrupted The therapy time duration is also dependent on the patient s temperature at the time the Auto Moderate or Auto Gradual control modes are re selected For water temperature control the main microcontroller control system outputs a pulse train to each solenoid valve The pulse train to the hot solenoid and also heater is the complement of the pulse train to the cold solenoid The pulse train duty cycle depends on the magnitude and sense of the control signal calculated by the main microcontroller That is while the solenoids are each either on or off the ratio of on time to off time is proportional to the calculated control signal amplitude For large differences between set point and probe temperatures the output to each solenoid valve will be either on or off For differences approaching zero the outputs to the solenoid valves and heater will switch on and off with the on and off times automatically adjusted to maintain a probe temperature equal to the set point The circulating pump is energized whenever the unit is in PATIENT CONT
99. ter Reservoir Machine Blanket Body Wrap Connections RETURN Water Temp Probe RT2 Over Temperature Probe RT3 SV1Cold Pump Solenoid Blanket or Body Wrap Water bypass prevents overheating when a blanket or body wrap is not connected to the Medi Therm lll Figure 15B Cooling flow diagram 54 MTA7912 Service Manual Service Information LOW PRESSURE GAS COLD TANK PROBE ASSEMBLY RT1 LOW SIDE m SUCTION SERVICE VALVE LOW PRESSURE LIQUID J EVAPORATOR COIL 3 CAPILLARY CSS TUBE HERMETIC COMPRESSOR lt CONDENSER FAN CONDENSER flow IN HIGH SIDE HIGH PRESSURE LIQUID SERVICE VALVE A HIGH PRESSURE GAS Figure 16 Refrigeration flow diagram 55 Service Information MTA7912 Service Manual Full size Blanket on an insulating Thermometer surface L gt E DBK35CE y dl Connector Hose H D S lt b gt uen SUPPLY SN E SR RETURN Se L TPT9 Tester Must always be installed in the SUPPLY line before blanket Do not install in the RETURN line Figure 17A Test setup using TPT9 Tester and Thermometer Full size Blanket on an insulating surface Li DBK35CE Flowmeter Temperature Sensor 10 75 lpm 0 50 C 15 1 C Figure 17B Test setup using alternate test equipment 56 MTA7912 Se
100. this latch is selected a low signal on the data line from the microcontroller causes a high signal on the latch output Therefore these two LED bar displays are active low in the eyes of the microcontroller in contrast to all the other LED bar displays of the machine The audible alarm located on the alarm backup board is driven by a high signal from the control latch U51 from the main microcontroller via the data bus at address OFF7FH or a high RFU IN signal from Q10 on the power supply board or a high signal from the PIC microcontroller on the alarm backup board A low data line signal from the main microcontroller to U51 causes a high signal on the latch output Therefore the alarm is active low in the eyes of the main microcontroller NOR gate U40 driver U26 and transistor Q1 work in conjunction to activate the alarm 6 44 Peripheral Input The input buffer U55 is the interface between the main microcontroller via the data bus at a read address of OFFFEH and the input signals from the flow switch S5 and the level switch 54 which travel from the base through the power supply board the probe presence switch within the patient probe jack J1 and the service mode button S3 on the control display board The lines to the buffer from the peripheral devices are default high via pull up resistors The level switch S4 will pull its buffer input line low when it senses a sufficient water level The flow switch S5 wil
101. tient display is driven by driver chip U6 The main microcontroller interfaces to it via the data bus at addresses OFFF4H OFFF5H OFFF6H 0 7 The water temperature display is driven by driver chip U5 The main microcontroller interfaces to it via the data bus at addresses OFFECH OFFEDH OFFEEH OFFEFH All alarm and status indicators are lit by LED bars driven by inverter driver IC s e The alarm latch U53 is the interface between the main microcontroller and the ALERT ADD WATER CHECK PATIENT CHECK FLOW REMOVE FROM USE NOW and SELECT drivers via the data bus at address OFFBFH A high signal written to the latch by the main microcontroller activates the individual inverter drivers to light the corresponding indicator The mode display latch U54 is the interface between main microcontroller and the FLOW OK COOLING WARMING PATIENT CONTROL BLANKET CONTROL and MONITOR ONLY drivers via the data bus at address OFFDFH A high signal written to the latch by the main microcontroller activates the individual inverter drivers The control option display latch U64 is the interface between the microcontroller and the GRADUAL MODERATE and RAPID drivers via the databus at address FDFFH A high signal written to the latch by the microcontroller activates the individual drivers The control latch U51 is the interface between the main microcontroller and the two leader light drivers via the data bus at address OFF7FH When
102. to the procedure described in section 7 2 4 p 18 8 Inspect the fluid system for debris and any sign of algae growth Clean according to Cleaning and Storage Procedures Fluid System section 7 2 p 17 b Attachment Plug Examine the attachment plug on the line cord to be sure that it is in good condition c Power Cord and Cord Retainer Make sure the detachable power cord is an approved cord set see 3 4 p 5 Examine the power cord along its entire length for physical damage such as cuts or cracked insulation A damaged power cord should be replaced rather than repaired Check that the cord retainer is installed and secure Do not operate without the cord retainer d Circuit Breaker A worn out circuit breaker can be responsible for intermittent shutoffs with no other apparent indications of failure Examine the physical condition of the circuit breaker paying particular attention to the push on terminals at the rear of the breaker Terminals should be snug Replace breaker and or terminals if there is discoloration or any indication of heating Cycle the switch on and off several times The switch should have a positive engagement click for the OFF and ON positions e POWER LOSS Indication Test to insure that the POWER LOSS indication works With the power cord unplugged turn the circuit breaker to the ON position The POWER LOSS indicator should flash and the audible alarm should sound continuously If it
103. trol panel ribbon from the control board Folding the ribbon cable may cause failure of the control panel T Lift board out of head 9 4 2 Control Display Board Installation see fig 14 p 53 1 Unplug the power cord 2 Place the new control display board in head 3 Install the two 2 board mounting screws and four 4 standoffs as follows a Install two 2 board screws through the ground harness on the patient probe end of the board NOTE Insure that the corner screw also connects the ground wire of the patient probe assembly to the board 49 Repair Procedures MTA7912 Service Manual b Install the standoffs through the other four 4 holes 4 Insert patient probe assembly into mounting hole and fasten with hex nut Insure patient probe assembly is oriented so that the bevelled corner of the probe assembly is positioned as shown in figure 20 p 60 item 62 5 Connect the digital control panel plug P4 to the board at J4 6 Connect the patient probe assembly plug P2 to the board at J2 T Perform a voltage check of the power supply board see section 9 2 2 p 48 8 Install the alarm backup board see section 9 3 2 steps 2 8 9 Perform the Functional Check and Safety Inspection section 7 3 9 5 Replacing the Head To install a new head 1 Unplug the power cord 2 Remove old head from machine by removing six screws around the head and disconnecting cables See figure 18 p 57
104. tting to the patient GRADUAL Water temperature is limited to 1070 below the patient s temperature This will provide the optimal comfort setting to the patient When WARMING the patient RAPID the highest allowable water temperature is used for warming as high as 41 C This is the fastest warming mode the machine can provide MODERATE The patient temperature will increase at a rate of 1 C in a period of 3 hours 0 33 C Hr GRADUAL The patient temperature will increase at a rate of 1 C in a period of 6 hours 0 17 C Hr 13 Theory of Operation MTA7912 Service Manual When WARMING a patient in MODERATE or GRADUAL modes water temperatue is limited to a maximum of 41 0 C and a minimum which is determined by the current CONTROL OPTION selected 1570 below the patient temperature in MODERATE mode an 10 C below the patient temperature in GRADUAL mode When using AUTO MODERATE and AUTO GRADUAL for patient warming NO MANUAL INTERVENTION is required once the patient set point temperature has been selected for warming If the patient temperature deviates from the warming rate specified by the CONTROL OPTION selected MODERATE or GRADUAL only by 1 0 C the following will occur the PATIENT temperature will flash the ALERT led will flash and the audible alarm will toggle Once the patient temperature returns to within 1 0 C of the warming rate specified by the CONTROL OPTION selected the PATIENT
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106. uivalent YSI 400 series probe approved for use with medical devices located on front of machine 4 CET Connect patient probe then use to monitor patient temperature No therapy is provided Theory of Operation MTA7912 Service Manual 6 0 Theory of Operation System The Gaymar Medi Therm 111 machine provides a means of regu lating patient temperature by supplying temperature controlled water through a connector hose to a Gaymar Hyper Hypothermia blanket body wrap The blanket body wrap provides an interface for heating or cooling the patient A patient probe senses patient temperature which is displayed on the control panel See fig 4 p 7 and fig 5 p 9 The Medi Therm Ill machine controls output water temperature by mixing hot and cold water using hot and cold solenoid valves under microcontroller control A circulating pump heater and refrigeration unit are also utilized Two backup systems limit output water temperature independent of the main microcontroller The feedback for control purposes depends upon the machine s operating mode The machine may be operated in one of three operating modes n BLANKET CONTROL mode the operator sets the desired water temperature A temperature sensor within the machine monitors the water temperature and the machine heats or cools the water as required to bring the water to the SET POINT temperature The patient temperature may be monitored by use of a patient probe
107. upports Step 10 Refer to figure E Push handle protector item 2 down behind the two 2 front corner supports so it rests on top of the handle Slide master carton item 1 over corner supports Step 11 Refer to figure F Tape the top of the carton closed using nylon filament tape item 4 supplied with kit Step 12 Refer to figure G for folding the bottom cap and securing the plastic strap and clip item 6 CONTENTS OF MEDI THERM SHIPPING KIT P N 78196 000 ITEM DESCRIPTION Y Handle Protector 3 Cardboard Corner 4 Support 4 Nylon Filament Tape 1 3 4 wide 5 Cardboard Carton 1 Support Plastic Strap with 1 1 Shipping Kit 1 Attachment Clip Instructions Figure 30 Shipping Instructions K Wood Shipping Brace ITEM DESCRIPTION Y Cardboard Bottom 1 Cap Wood Shipping Brace 2 Screw Washer 7 10 11 2 74 Gaymar Your patients Our commitment GAYMAR INDUSTRIES INC 10 Centre Drive Orchard Park NY 14127 2295 USA Phone 1 716 662 8636 Fax 1 716 662 0730
108. ure 23 Power Supply Board lj We OTU zia Od of Foz Q O 122 ol o vt Q ii OL Fo 2 iar F OOO 60 yuan OO 064 N oin QOD Seng T0 o 273 10964 fos DEER O se ol Hd BIA 6 zio SY RORY Se bi er fer zar 0 a N Lo 04 7 oT 82 D zu zy 4 2 sn O AG zu p WS FRE E s nee O lu S Ga gt 000 A e dr RNS 9 512 O o rosis of to siu di zn D H O YON en Eer ESCH pia O 218 Vi Cer o fo of te a eu S lt gt q O EA AAA y E S s ss Agas Sas 33 ER d Do m CN Di To ZS o 64 MTA7912 Service Manual Power Supply Board C5 C7 C8 C10 C15 Capacitor 0 01yF 400V 90701 096 D12 Diode 1N4004 90717 001 los Je regulator LM340T 12 90712016 R ar Kis Resistor 390 ohm 1 4W 5 90092 039 Ro Resistor 100 ohm 1 4W 5 90092 025 R11 R12 Resistor 4 7K 1 2W 5 90092 225 R13 R14 R19 R24 R27 R28 Resistor 200 ohm 1 4W 5 90092 032 Parts List 65 Alarm Backup Board MTA7912 Service Manual C O 000 18501 Nd L U of o Bo m see i 000000000 Seo 5000000
109. wer supply board includes two REMOVE FROM USE NOW latching circuits made up of U3 U4 U5 U6 U9 U10 D2 03 Q1 Q2 and their interconnecting components Under normal circumstances Q1 and Q2 are kept turned on by the action of R7 C10 and 04 and R5 C15 and D5 to complete the conduction path for the heater and pump 6 4 7 2 Backup System The PIC microcontroller has its own power supply on the alarm backup board which is independent of the main microcontroller s MTA7912 Service Manual Theory of Operation power supply circuits Transformer T1 output is rectified and filtered to generate unregulated positive voltage Q1 is a linear regulator with a nominal output of 5 0 volts Interface circuitry for Backup System 1 consists of Q2 and R1 on the alarm backup board and optical coupler U4 on the power supply board which is powered by the independent power supply of the alarm backup board The PIC microcontroller repetitively compares the resistance of the RT3 over temperature probe which is a 400 series thermistor in the water flow path with fixed precision resistor R11 When the water temperature as sensed by RT3 surpasses the temperature represented by the fixed resistor see section 3 2 Thermal Specifications page 3 for the RT3 high temperature limit the PIC commands a REMOVE FROM USE NOW shutdown condition via optical coupler U4 on the power supply board It also signals the audible alarm directly with a continuous to
110. y button except the BLANKET CONTROL button will reset the machine to standby mode Pressing the BLANKET CONTROL button will do nothing Service Mode 3 To access Press PATIENT CONTROL while in service mode 1 Uses To prewarm the machine for testing of the backup system 1 over temperature probe RT3 and the backup system 2 S2 thermostat trip points Description PATIENT TEMPERATURE display is blank ALERT LED flashes Leader lights flash SETPOINT TEMPERATURE display flashes 3 WATER TEMPERATURE display shows the water temperature The output water temperature is controlled to 41 C To exit Pressing any button except the PATIENT CONTROL button or the DOWN button will reset the machine to standby mode Pressing the PATIENT CONTROL button again will do nothing Pressing the DOWN button will put the machine into service mode 4 from mode 3 Service Modes MTA7912 Service Manual Service Mode 4 To access Press DOWN while in service mode 3 Uses To test the trip points of the backup system 1 over temperature probe RT3 and the backup system 2 S2 thermostat Description PATIENT TEMPERATURE display is blank ALERT LED flashes Leader lights flash SETPOINT TEMPERATURE display flashes 4 WATER TEMPERATURE display shows the water temperature The output water temperature is controlled to 48 C Pressing any button except the DOWN button will reset the machine to standby mode Pressing the
111. y the carrier at once and ask for an inspection in writing Failure to do this within 15 days may result in loss of claim Before placing the Medi Therm 111 machine into service remove the three compressor shipping braces see p 74 fig B attach the power cord p 59 fill the reservoir with distilled water p 3 and p 7 make sure the power loss indication works 6 p 19 and perform a Functional Check and Safety Inspection pp 18 22 7 2 Cleaning and Storage Procedures FLUID SYSTEM Use distilled water to retard algae growth and mineral buildup Change the distilled water monthly or more often depending upon use The water circulation system including reusable blankets should be cleaned every month to retard algae growth To clean the fluid system drain the machine and prepare an algaecidal solution according to manufacturer s instructions Use AirKem A 33 or equivalent Add the solution to the machine attach blankets set the machine in BLANKET CONTROL mode to a setpoint temperature of 27 C and circulate the solution for 12 hours Drain the solution and refill the machine with distilled water Algaecide solution may be readded to the water and left in the machine in the recommended concentration to further retard algae growth A CAUTION Do not exceed proper algaecidal solution concentration Excessive algaecide may cause foaming which can damage the circulating pump Do not use bleach sodium hypochl
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