Gaymar MEDI-THERM II MTA5900 Series Service Manual Download Page 45

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aymar

.com P/N 10187-000 7/98

Figure 6D—RFU Codes 4, 5

TROUBLESHOOTING CHARTS

RFU CODE 5

Compensation resistor 1

(R12 on

control/display board)

reading is too low

Yes

Repair/replace

the

control/display board.

Suspect

temperature

measurement

circuitry.

Is it

816 ohms

±0.1%

Replace R12.

Measure R12

resistance.

RFU CODE 4

Compensation resistor 1

(R12 on

control/display board)

reading is too high

SERVICE MANUAL
Medi-Therm II

Summary of Contents for MEDI-THERM II MTA5900 Series

Page 1: ...MEDI THERM II HYPER HYPOTHERMIAMACHINE MTA5900SERIES SERVICE MANUAL LISTED 303L P N 10187 000 7 98 www gaymar com P N 10187 000 7 98...

Page 2: ...Save all packing material Perform a visual and mechanical inspection for concealed damage by removing the wraparound from the chassis see page 73 If any damage is found notify the carrier at once and...

Page 3: ...pecifications 6 5 0 PROBE INFORMATION 7 6 0 THEORY OF OPERATIONS 9 6 1 Machine 9 6 2 Interconnections 11 6 3 Power Supply 12 6 4 Machine Functions 12 7 0 FUNCTIONAL CHECK SAFETY INSPECTION PREVENTIVE...

Page 4: ...page 1 of 2 52 6K Blanket Won t Heat in Auto or Manual Mode page 2 of 2 53 6L Blanket Will Not Cool page 1 of 3 54 6L Blanket Will Not Cool page 2 of 3 55 6L Blanket Will Not Cool page 3 of 3 56 7 Flo...

Page 5: ...s order is required for setting blanket temperature and for continued use of equipment At least every 20 minutes or as directed by a physician check patient s temperature and skin condition of areas i...

Page 6: ...wed to remain between patients and water circulating heating blankets during prolonged procedures 3 REFERENCES 1 Gendron F G Unexplained Patient Burns chap 5 p 87 Quest Publishing Co 1988 2 Scott Stew...

Page 7: ...tion Some manufacturer s patient probes may contain compensation resistors in series with YSI400 series thermistors Do not use these probes with the Medi Therm II machine Inaccurate patient temperatur...

Page 8: ...hine is recommended and is available from Gaymar For specific details contact your Gaymar representative or the Technical Service Department at Gaymar See back cover of this manual for Gaymar telephon...

Page 9: ...C Patient Temperature Control Range for Automatic Mode 89 6 F 32 C to 105 8 F 41 C Blanket Water Temperature Control Range for Manual Mode 39 2 F 4 C to 107 6 F 42 C 39 2 F 4 C to 105 8 F 41 C 39 2 F...

Page 10: ...ient Temperature Measurement Accuracy 0 5 C 0 9 F using Gaymar 400 series probe Display Accuracy 0 3 C 0 5 F Display Resolution Blanket Water Temperature 1 C 1 F Patient Temperature 0 1 C 0 1 F Contro...

Page 11: ...DP400 connects Gaymar disposable probe to Gaymar or Cincinnati Sub Zero control unit for all applications that call for Baxter Pharmaseal No 66N2700 ADP10B Reusable adaptor cable for DP400 connects G...

Page 12: ...ystem control panel YSI 400 series or equivalent patient probe connector hose Medi Therm II machine Hyper Hypothermia blanket pinch clamp Clik Tite connector Quick disconnects on machine end Clik Tite...

Page 13: ...nually adjust the blanket water set point temperature An inline blanket water probe senses the temperature of the water pumped to the blanket and provides feedback for control purposes to the micropro...

Page 14: ...10 and 11 REFRIGERATION UNIT The refrigeration circuit see figure 12 p 71 consists of two heat exchangers operating at two pressures and two devices used to change these pressures The first of these...

Page 15: ...e compressor shuts down the displays blank and the ALERT indicator and audible alarm turn on and off See figure 8 p 67 for base to head and control display board to power supply board connections figu...

Page 16: ...s the high voltage backup water temperature limiting circuits and transformer T1 Power to drive the low voltage circuits on the control display board is derived from the machine s power supplies which...

Page 17: ...the same manner These compensation resistors are precision resistors with values at each end of the probe temperature range of 32 F 0 C to 122 F 50 C The values from the precision resistors are used...

Page 18: ...ible alarm is driven either by a high signal from the control latch U51 from the microprocessor via the data bus at address 0FF7FH or a high RFU IN signal from Q10 on the power supply board A low data...

Page 19: ...y adjusted to maintain a probe temperature equal to the set point The circulating pump is energized whenever the unit is in AUTO or MANUAL modes The control latch U51 on the control display board is t...

Page 20: ...h corresponding model number of your machine When any one 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...

Page 21: ...on the power supply board and cause the REMOVE FROM USE NOW MACHINE SHUTDOWN condition to recur Also if during normal operation the microprocessor senses internal problems it will attempt a shutdown...

Page 22: ...m Enviro San Inc 2361 Wehrle Drive Williamsville NY 14221 telephone 716 634 9900 Add the solution to the machine attach blankets set the machine in MANUAL mode to a setpoint temperature of 27 C 80 6 F...

Page 23: ...disposable protective sheath Becton Dickinson catalog 3700 oral sheath or equivalent on the probe Failure to use sheath could result in cross contamination Probes Do not autoclave Clean with a damp cl...

Page 24: ...Precision Decade Box 0 10K ohms 0 2 accuracy 1 ohm increments GAYMAR DHP901 or DHP813 Hyper Hypothermia Blanket GAYMAR MT590 Medi Therm II Test Tool or 6 approximately 150 cm Shorting Jumper Ground R...

Page 25: ...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 Clea...

Page 26: ...flow rate The FLOW OK indicator should be lit 6 The flow rate in both modes should exceed 16 GPH 60 6 liters hr for an MTA5942 MTA5900 and 12 GPH 45 4 liters hr for an MTA5901 NOTE If the unit has bee...

Page 27: ...ller 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 13 p 72 3 Turn machine on Set in MANUAL mode 4 S...

Page 28: ...t Tool is available For those facilities not having access to an MT590 follow steps 1A 20A pp 27 28 7 3 FUNCTIONAL CHECK SAFETY INSPECTION continued COMPRESSOR COLD SOL HOT SOL PUMP HEA TER J1 S2 BYP...

Page 29: ...lace the machine in service mode 3 Refer to section 8 1 SERVICE MODES pp 34 35 for instructions on how to access service modes 6 To insure the correct measurement of thermostat trip points run machine...

Page 30: ...en repeat steps 6 through 8 to check the other thermostat 12 Place both switches S2 and S3 in the bypass position Turn the machine off then turn the machine on and select MANUAL mode Allow machine to...

Page 31: ...out slightly to clear foam 4A Remove plastic cover from wiring terminal block TB1 See figure 14 for TB1 location 5A Replace wraparound cover Do not reinstall screws at this time 6A Connect test setup...

Page 32: ...temperature at the TPT9 was within the high temperature limits range See Table 1 p 25 for high temperature limits with corresponding model number of your machine If both thermostats have tripped proce...

Page 33: ...the same angle as the terminal see figures 17 17A p 77 6 Plug in the machine and turn it on 7 Select MANUAL mode 8 Observe that the machine indicates REMOVE FROM USE NOW MACHINE SHUTDOWN 9 Turn the ma...

Page 34: ...t to limit low temperatures between 26 6 F 3 0 C and 36 5 F 2 5 C It is not necessary to test the trip point as part of this functional test The function of the thermostat is to protect the machinery...

Page 35: ...xceed the following Condition Current Leakage Machine grounded 10 microamps Machine ungrounded 100 microamps Current Leakage PATIENT PROBE It is first necessary to prepare a patient probe by wrapping...

Page 36: ...a through q the machine should be considered operational and suitable for return to service Verify that the MT590 Test Tool or any installed shorting jumpers have been removed before returning the Me...

Page 37: ...gs within 1 8 F 1 C of temperature setpoint Mercury thermometer reading within 1 8 F 1 C of temperature setpoint j Automatic mode Blanket water limit k1 MTA5900 MTA5901 S2 High temperature backup ther...

Page 38: ...old service button S3 on the low voltage control display board figure 5 then turn the machine on In service mode 1 the machine will display the last RFU code on the BLANKET display and the software ve...

Page 39: ...or short circuited Figure 6D 6 Compensation resistor 2 R13 is out of spec too high or open circuited Figure 6E 7 Compensation resistor 2 R13 is out of spec too low or short circuited Figure 6E 8 Blank...

Page 40: ...ed To exit Pressing the MANUAL AUTO or MONITOR 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...

Page 41: ...Celsius or Fahrenheit depending on choice made in last normal operating mode For models MTA5900 and MTA5901 the output water temperature is controlled to 118 4 F 48 C For model MTA5942 the output wat...

Page 42: ...rm the FUNCTIONAL CHECK AND SAFETY INSPECTION see section 7 3 prior to troubleshooting machine TROUBLESHOOTING CHARTS 38 SERVICE MANUAL Medi Therm II See appropriate REMOVE FROM USE NOW MACHINE SHUTDO...

Page 43: ...Suspect controller failure caused RT1 or RT2 to read an actual temperature outside 32 F to 122 F 0 C to 50 C range Faulty signal lines between control display board and RT2 Is it between 811 and 7355...

Page 44: ...2 3 E and L TROUBLESHOOTING CHARTS 40 RFU Code 3 Conversion Failure Microprocessor system failure Contact GAYMAR Technical Services RFU Code L RFU Code E RAMTEST Failure RFU Code CHECKSUM Failure RFU...

Page 45: ...stor 1 R12 on control display board reading is too low No Yes Repair replace the control display board Suspect temperature measurement circuitry Is it 816 ohms 0 1 Replace R12 Measure R12 resistance R...

Page 46: ...stor 2 R13 on control display board reading is too low No Yes Repair replace the control display board Suspect temperature measurement circuitry Is it 7320 ohms 0 1 Replace R13 Measure R13 resistance...

Page 47: ...10 and 1 1 of J1 on back of control display board Insure integrity of control display board to power supply board connections Insure integrity of base to power supply board connections Yes Yes No No S...

Page 48: ...3 and 1 1 of J1 on back of control display board Insure integrity of control display board to power supply board connections Insure integrity of base to power supply board connections Yes Yes No No Su...

Page 49: ...www gaymar com P N 10187 000 7 98 TROUBLESHOOTING CHARTS 45 SERVICE MANUAL Medi Therm II This page has been intentionally left blank...

Page 50: ...y Replace thermostat Is resistance 0 Is S2 or S3 thermostat out of spec Power down unit Measure ohms across TB1 terminals 10 and 8 Test S2 S3 as indicated in High Temperature Thermostat Function T est...

Page 51: ...S2 S3 as indicated in High Temperature Thermostat Function T est Operate unit in MANUAL mode with setpoint temperature equal to 39 2 F 4 C Does RFU condition reappear Possible faulty control system or...

Page 52: ...d cooling Connect test setup as shown in figure 13 Is a steel object attracted to center top of the valve Yes No Yes No Yes No No No Yes Is pin 11 ref to pin 10 of U51 0 VDC Suspect control display bo...

Page 53: ...nce for short Is cold solenoid SV1 coil shorted Suspect Q9 or U8 Repair replace power supply Assume Q9 triac is also damaged Repair replace power supply board Repair replace cold solenoid SV1 Yes Yes...

Page 54: ...pect control display board Repair replace Suspect board to board connection Repair Is pin 8 ref to pin 10 of U51 0 VDC Disconnect pump and measure resistance for short It should be approximately 10 oh...

Page 55: ...SERVICE MANUAL Medi Therm II www gaymar com P N 10187 000 7 98 51 TROUBLESHOOTING CHARTS This page has been intentionally left blank...

Page 56: ...pair replace Suspect Q9 or U8 Repair or replace power supply board Is pin 9 ref to pin 10 of U51 0 VDC Suspect board to board connection Repair Suspect base to power supply board connection Repair Is...

Page 57: ...seats repair replace Suspect Q3 or U1 Repair replace power supply board Is optocoupler U1 input low Is pin 11 ref to pin 10 of U51 0 VDC Replace heater Suspect cold solenoid SV1 may be stuck open or h...

Page 58: ...reservoir temperature 42 8 F 6 C or below See CHECK WATER FLOW alert is on figure 6I See PUMP MOTOR NOT RUNNING figure 6J Dirty or restricted refrigeration condenser Refrigeration unit may have lost i...

Page 59: ...y board Is optocoupler U1 input pulled low Suspect control display board Repair replace Suspect base to power supply board connection Repair Line voltage at output of Q3 Is pin 9 ref to pin 10 of U51...

Page 60: ...sor capacitor Suspect compressor unit thermal overload Suspect compressor unit starter relay Suspect board to board connection Repair Suspect transistor Q12 Repair replace power supply board Suspect b...

Page 61: ...t 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 r...

Page 62: ...eplace the two service valve caps and two gage port caps after servicing the refrigeration system After servicing the refrigeration unit be sure to perform the FUNCTIONAL CHECK AND SAFETY INSPECTION s...

Page 63: ...should be approximately 15 to 25 psi the high side pressure should be approximately 115 to 135 psi under the following conditions 1 the unit s wraparound is removed 2 the ambient temperature is 72 F...

Page 64: ...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...

Page 65: ...from the board at J2 NOTE These connectors have locking tabs that must be pressed in order to disengage them from the board Use care when disconnecting the digital control panel ribbon from the contr...

Page 66: ...HECK AND SAFETY INSPECTION section 7 3 To replace thermostat see figures 15 17 17A and 18 pp 74 75 77 79 1 Unplug the power cord 2 Remove wraparound from chassis 3 Remove thermostat cover On certain m...

Page 67: ...10 Reapply insulating material 11 Perform the FUNCTIONAL CHECK AND SAFETY INSPECTION section 7 3 To clean the flow switch see figure 7 below and figure 15 pp 74 75 1 Remove nuts item A and remove ass...

Page 68: ...ping brace before shipment can result in extensive damage to the refrigeration section See p 86 figure B See figure 25 p 86 for complete repackaging instructions to ship the Medi Therm II machine back...

Page 69: ...0 39 2 15 5 59 9 27 0 80 6 38 5 101 3 4 5 40 1 16 0 60 8 27 5 81 5 39 0 102 2 5 0 41 0 16 5 61 7 28 0 82 4 39 5 103 1 5 5 41 9 17 0 62 6 28 5 83 3 40 0 104 0 6 0 42 8 17 5 63 5 29 0 84 2 40 5 104 9 6...

Page 70: ...84 2 1894 4 39 2 6011 30 86 0 1815 5 41 0 5719 31 87 8 1739 6 42 8 5444 32 89 6 1667 7 44 6 5183 33 91 4 1599 8 46 4 4937 34 93 2 1533 9 48 2 4703 35 95 0 1471 10 50 0 4482 36 96 8 1412 11 51 8 4273 3...

Page 71: ...D HARNESS P4 at J4 P5 at J3 PATIENT PROBE ASSEMBLY P2 at J2 P1 at J1 P6 at J2 POWER SUPPLY BOARD GROUND HARNESS CHASSIS GROUND P7 at J1 CABLE ASSEMBLY 26 CONDUCTOR CONTROL DISPLAY BOARD SERVICE INFORM...

Page 72: ...Cool TO CONTROL BLANKET TEMPERATURE TO CONTROL PATIENT TEMPERATURE TO MONITOR PATIENT TEMPERATURE NO THERAPY CONNECT BLANKET S PRESS MANUAL BUTTON SET DESIRED BLANKET TEMP CONNECT BLANKET S INSERT PA...

Page 73: ...5 MONITOR Selects the monitor mode of operation In MONITOR mode the operator may monitor patient temperature without providing therapy 16 BLANKET Indicates the actual temperature of the water being de...

Page 74: ...00 7 98 1 1 Figure 11 Cooling flow diagram When the Medi Therm II machine is cooling water flows in the path shown below Figure 10 Heating flow diagram When the Medi Therm II machine is heating water...

Page 75: ...UCTION SERVICE VALVE CONDENSER CONDENSER FAN HIGH PRESSURE LIQUID HERMETIC COMPRESSOR HIGH PRESSURE GAS COLD TANK PROBE ASSEMBLY RT1 EVAPORATOR COIL LOW PRESSURE LIQUID CAPILLARY TUBE FILTER DRIER HIG...

Page 76: ...SERVICE MANUAL Medi Therm II www gaymar com P N 10187 000 7 98 SERVICE INFORMATION Figure 13 Test setup 72...

Page 77: ...SERVICE MANUAL Medi Therm II www gaymar com P N 10187 000 7 98 Figure 14 Machine disassembly SERVICE INFORMATION 73...

Page 78: ...SERVICE MANUAL Medi Therm II www gaymar com P N 10187 000 7 98 17 19 18 11 13 8 9 6 5 4 2 1 16 15 10 21 7 3 14 12 SERVICE INFORMATION Figure 15 Parts Diagram Base 74...

Page 79: ...4 000 77754 000 CIRCUIT BREAKER COVER 77756 000 77756 000 77756 000 7 SOLENOID VALVE SV1 SV2 77824 000 77824 000 77824 000 8 WATER LEVEL SENSOR 77757 000 77757 000 77757 000 9 TRANSFORMER ASSEMBLY T1...

Page 80: ...24 26 25 33 30 ITEM DESCRIPTION PART NUMBER MTA5942 MTA5900 MTA5901 23 COVER WITH LABELS CONTROL PANEL FLOAT ASSY 77764 000 77764 000 77800 000 24 STEM 77760 000 ALL PARTS 77760 000 ALL PARTS 77760 00...

Page 81: ...NOTE Positions 8 and 9 of TB1 are connected together SERVICE INFORMATION 77 Figure 17 Original Thermostat Wiring Diagram for MTA5900 MTA5901 Figure 17A New Thermostat Wiring Diagram for MTA5942 MTA590...

Page 82: ...SERVICE MANUAL Medi Therm II www gaymar com P N 10187 000 7 98 This page has been intentionally left blank 78...

Page 83: ...MEDI THERMTM II IS MADE IN THE USA www gaymar com...

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