Tech Sheet Do not discard AI Electrical Shock Hazard Disconnect power before servicing. eplace all parts and panels before operating. Failure to do so can result in death or electrical shock. PECAUTIOS TO BE OBSEVED BEFOE AD DUI SEVICI TO AVOID POSSIBE EXPOSUE TO EXCESSIVE MICOAVE EEY a. Do not operate or allow the oven to be operated with the door open. b. Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source, and make repairs as necessary:. Operation. Proper Door Closing 3. Seal and Sealing Surfaces (Arcing, ear and Other Damage) 4. Damage to or oosening of Hinges and atches 5. Evidence of Dropping or Abuse c. Before turning on microwave power for any service test or inspection within the microwave generating compartments, check the magnetron, waveguide or transmission line, and cavity for proper alignment, integrity and connections. d. Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation and transmission systems shall be repaired, replaced, or adjusted by procedures described in service manual before the oven is released to the owner. e. A microwave leakage check to verify compliance with the Federal Performance Standard should be performed on each oven prior to release to the owner. f. Do not attempt to operate the oven if the door glass is broken. 80593 / 469-65-9885 FO SEVICE TECHICIA S USE OY
T 5 P8 3 Y P8 P58 P63 Y/5C P Y/3C UIB CD P3 / /0C P7 P74 /3C 8P8 7P8 9P8 UIB Thermistor /3C Magnetron II DIAAMS Schematic Diagram 3 O 4 B 0V / 5V,60Hz B B P3 AC ine P33 P84 5 6 VD Cy 43 Coil A. D T P83 4 CF FCF 55 5P8 8 Cx Cx P9 H H 3 8 Monitor 50 6P8 TT Base Cy Y 5 FC 49 P84 rill P83 4P8 P9 FCTH 35 B 3P8 6 B 7 B elay Board FC ing Heater 9 6 Quartz rill Heater 5 Halogen rill Element 3 0 4 Y 40 Y 39 36 33 P 6 P 63 Y 64 P34 P3 60 Y 59 O B. Door FS P6 VD VD C P35 Start Quartz tube 4 P53 P54 CF FCFA TT P57 P67 3 P56 P66 FC Temperature Sensor 56 53 3 B 0 34 FCFA elay 4907 CF elay 490 TT elay 4906 elay Control Board P64 54 P85 P87 P86 P88 P89 elay 4930 elay 493 elay 493 M elay feedback 7 P6 3 Magnetron sensor C70 M elay 4903 FCH elay 4905 Heater elay 4904 rill elay 494 Start elay 494 500mA 4 7 500mA 470 P55 P65 0 P5 C 70 P90 C703 Y P73 P68 E70 4 37 A. 38 58 45 Y/ 47 46 B. / 0uF/400V Motor Capacitor 3P8 P8 P8 P Hood/ight Humidity Sensor 9 9 Secondary Exhaust Hood Fan Motor HF aveguide 8 6 5 D O. MU-057 B ire Color - Brown ire o. - B: Brown O: Orange Y: ray : hite : reen Y: Yellow /3C ibbon Cable / 3 Core TT Turntable Motor HF Condition: Door Open Hood Exhaust Fan Motor Symbol otes CF Cooling Fan Motor P/P3/P3/P33/P34/P35/P5//P53/P54/P55/P56/P57 : Black C amp FC (Forced Convection) FCF /P58/P6/P6/P63/P64/P65/P66/P67/P68/P7/P7/P73/ Fan Motor : Blue P74/C70/C70/C703: ire to PCB Connectors : ed P8/P8/P83/P84: ire to ire Connectors FCTH H Hood amp (Cooktop amp) FC (Forced Convection) Thermoactuator P85/P86/P87/P88/P89/P90: ire to elay Connectors T: Transparent P Power esistor
Parts ayout (not to scale) JJ FF II HH A B C D E F EE DD H I J K AA KK A. Halogen grill element B. Start quartz tube C. Quartz grill heater D. rill thermostat opens at 93ºF (45ºC), closes at 58ºF (70ºC) E. aveguide thermostat opens at 57ºF (5ºC), closes at -95ºF (-35ºC) F. AC line filter. elay board H. Magnetron thermistor I. Magnetron J. Secondary interlock switch K. FC thermoactuator. Ferrite ring M. CC BB U AA Z Y X. Cooling fan motor O. Motor capacitor P. Monitor interlock switch Q. interlock switch. elay control board S. ine fuse (0 amp) T. holder U. Hood (cooktop) lamps V. Hood exhaust fan motor. Power resistor- (0 ohm/5 ) X. Power resistor- (4 ohm/50 ) Y. Base thermostat closes at 40ºF (60ºC), opens at 04ºF (40ºC) Z. Turntable motor AA. Touch panel (back and front views) V U T S Q O M BB. lamp CC. Hood/light switch DD. FC motor EE. FC thermostat opens at 39ºF (65ºC), closes at 57ºF (5ºC) FF. FC ring heater. FC thermistor HH. Humidity sensor II. thermostat opens at 39ºF (65ºC), closes at -ºF (-30ºC) JJ. Door control assembly (back view) (includes the touch panel only) KK. UIB (user interface board). CD module P, Secondary, and Monitor Checkout Procedure Check By Door Open Door Closed Secondary Monitor. Unplug microwave oven or disconnect power.. Disconnect the wires at the. 3. Check from the common terminal (brown wires) to the normally open terminal (brown/white wires).. Unplug microwave oven or disconnect power.. Disconnect the wires at the. 3. Check from the common terminal (brown wires) to the normally closed terminal (orange wire).. Unplug microwave oven or disconnect power.. Disconnect the wires at the Secondary. 3. Check from the common terminal (blue wire) to the normally open terminal (white/blue wires).. Unplug microwave oven or disconnect power.. Disconnect the wires at the Monitor. 3. Check from the common terminal (blue wire) to the normally closed terminal (white/red wires). - + + - - + + - (+) Continuity (-) o Continuity 3
OTE: These diagrams are not intended to show a complete circuit; they represent the position of switches during DOO OPE or DOO COSED (continuity checks only). Door Closed (C) (O) (O) (C) (O) Monitor Do not continue with the diagnostics of appliance if the household fuse is blown, a circuit breaker is tripped or if there is less than 0-volt power supply at the wall outlet. Complete the following steps before checking microwave oven circuitry:. Unplug microwave oven or disconnect power.. Check for loose wiring or incorrect wiring within microwave oven. and Magnetron Circuit Secondary Door Open (C) TOUBESHOOTI (O) (O) (C) (O) Monitor Secondary 3. Disconnect white wire from power transformer and discharge high-voltage capacitor. 4. All testing must be done with an ohmmeter having a sensitivity of 0,000 ohms per volt DC or greater, and powered by at least a 9-volt battery. 5. All operational checks using microwave energy must be done with the microwave oven loaded with a minimum of 8 oz (50 m) of water in a microwave-safe container. B B elay Board 500mA B P5 470 M elay B 4903 Secondary aveguide P56 ibbon 0 Cable P66 ibbon Magnetron C70 Cable elay Control Board 3 P65 C70 3 C703 Halogen rill Heater Circuit B B rill Halogen rill Element elay Board rill elay 494 Secondary aveguide Quartz rill Heater Circuit elay Board Quartz rill aveguide Heater elay Element B B rill 4904 Secondary Start Quartz Tube Circuit B B Halogen rill Element rill Start Quartz Tube elay Board Start elay 494 aveguide Secondary 4
Forced Convection (FC) Circuit FCF Y FCTH Y 3P53 4P53 elay Board FCFA elay 4907 B P5 FC ing Heater B B FCH elay B FC 4905 aveguide Hood Exhaust Fan on ow Speed B B B P5 Motor P8 Capacitor B HF 4P54 3P8 8P8 5P8 B P P P54 P8 Power Power 3P8 esistor- esistor- elay Board 500mA 470 elay 4930 aveguide Hood Exhaust Fan on Mid- Speed B B B P5 Motor P8 Capacitor B HF 4P54 3P8 8P8 5P8 B P P P54 P8 Power Power 3P8 esistor- esistor- Y P54 Y 7P8 3P54 9P8 O elay Board 500mA 470 elay 4930 elay 493 aveguide Hood Exhaust Fan on Mid- Speed B B B P5 Motor P8 Capacitor B HF 4P54 3P8 8P8 5P8 P P B P54 P8 Power Power esistor- esistor- 3P8 Y P54 Y 7P8 elay Board 500mA 470 elay 4930 elay 493 aveguide 5
Hood Exhaust Fan on High Speed Manually B B B P5 Motor P8 Capacitor B HF 4P54 3P8 8P8 5P8 O 3P54 P8 9P8 elay Board 500mA 470 elay 493 elay 4930 elay 493 aveguide Hood Exhaust Fan on High Speed Automatically B B B P5 P8 Motor Capacitor HF B 4P54 3P8 8P8 5P8 elay Board 500mA 470 aveguide P8 Base 4P8 Cooling Fan Motor Circuit elay Board CF P83 P83 B P53 4P54 CF elay 490 0 A m p 500mA B B B P5 470 aveguide Turntable Motor Circuit TT 6P8 P53 elay Board TT elay 4906 B B 5P8 B 4P54 500mA B P5 470 aveguide 6
Door Open Oven ight is On elay Board B B B P5 470500mA 4 500mA aveguide O P6 P55 P55 3P55 3 P6 elay Control Board P63 amp Cooktop ight on Variable ight B B B elay Board 470 P5 P5 500mA P58 P8 aveguide P84 T T Y H H P8 Y P84 Troubleshooting Circuit Test Chart Cooking Mode Magnetron Convection Element rill Elements Cooling Fan Convection Fan Hood Exhaust Fan Microwave only On On Convection On On On On rill On On On Microwave and rill Combination Microwave and Convection Combination On On On On On* On* On On On *Magnetron and convection elements turn on alternately, not simultaneously. OTE: After convection or grill elements are on, the cooling fan and hood exhaust fan may be on for up to 0 minutes for cooling. 7
Touch Panel and elay Control Board Tests Touch Panel To access the test mode:. Unplug microwave oven or disconnect power.. Open the microwave oven door. 3. Press and hold OFF/CACE. 4. Plug in microwave oven or reconnect power. 5. elease OFF/CACE and close microwave oven door. OTE: If the OFF/CACE key is pressed during this diagnostic routine, you will exit the test mode. Test Mode Table Screen Display Display Explanation Screen Display Display Explanation UIB S ver Version number of UIB (user interface board) software Hood Key Hood key number PB S Ver Flash FC thermistor (ºC) Version number of power board (relay control board) software The temperature (ºC) measured by FC (forced convection) thermistor maximum 50ºC Touch panel EEPOM M reply error Touch panel error Version number of PB (relay control board) EEPOM (Electrically Erasable Programmable ead-only Memory) M relay error UIB thermistor (ºC) The temperature (ºC) measured by UIB (user interface board) thermistor ranges about 5ºC above room temperature, if oven has not been used recently Smps FB error Hum sensor error thermistor error Smps feedback error Humidity sensor error thermistor error Magnetron thermistor (ºC) The temperature (ºC) measured by magnetron thermistor maximum 5ºC Magnetron thermistor error Magnetron thermistor error HUM PM Humidity level inside unit ranges between 8,000 and 9,500, depending on humidity level in oven cavity EEPOM error Power board (relay control board) error. Place 8 oz (50 m) of lukewarm water in the center of the microwave oven.. Operate on HIH power level for minutes. ater should be hot. Microwave Oven Power Output Test OTE: If the water takes longer than minutes to heat, this may indicate either the operating voltage is lower than 0 volts or there is a problem with the microwave oven. 8
Failure Codes Indications OTE: Many of the problems listed in the chart below may be solved by power cycling: unplug microwave oven or disconnect power. After one minute, plug in microwave oven or reconnect power. Display ikely Failure Condition ecommended epair Procedure F.E elay control board defective. Unplug microwave oven or disconnect power.. eplace the relay control board. 3. eplace all parts and panels before operating. 4. Plug in microwave oven or reconnect power. F.H Hood keys stuck. Unplug microwave oven or disconnect power.. eplace hood/light switch. 3. eplace all parts and panels before operating. 4. Plug in microwave oven or reconnect power. F.H F.Q Hood/light switch defective ot reading keypad inputs. Unplug microwave oven or disconnect power.. eplace hood/light switch. 3. eplace all parts and panels before operating. 4. Plug in microwave oven or reconnect power.. Unplug microwave oven or disconnect power.. eplace the user interface board (UIB). 3. eplace the door control assembly. 4. eplace all parts and panels before operating. 5. Plug in microwave oven or reconnect power. F3.H Humidity sensor. Unplug microwave oven or disconnect power.. Check connection to relay control board. 3. eplace humidity sensor. 4. eplace all parts and panels before operating. 5. Plug in microwave oven or reconnect power. 6. If problem persists, unplug microwave oven or disconnect power. 7. eplace relay control board. 8. eplace all parts and panels before operating. 9. Plug in microwave oven or reconnect power. F3.T UIB (user interface board) thermistor. Unplug microwave oven or disconnect power.. Check the connections from the UIB to the relay control board. 3. eplace all parts and panels before operating. 4. Plug in microwave oven or reconnect power. 5. If problem persists, unplug microwave oven or disconnect power. 6. eplace relay control board. 7. eplace all parts and panels before operating. 8. Plug in microwave oven or reconnect power. 9. If problem persists, unplug microwave oven or disconnect power. 0. eplace the UIB.. eplace all parts and panels before operating.. Plug in microwave oven or reconnect power. F3.T FC thermistor. Unplug microwave oven or disconnect power.. Check FC thermistor connection. 3. eplace the FC thermistor. 4. eplace all parts and panels before operating. 5. Plug in microwave oven or reconnect power. 6. If problem persists, unplug microwave oven or disconnect power. 7. eplace relay control board. 8. eplace all parts and panels before operating. 9. Plug in microwave oven or reconnect power. 9
Display ikely Failure Condition ecommended epair Procedure F3.T4 Magnetron thermistor. Unplug microwave oven or disconnect power.. Check magnetron thermistor connection. 3. eplace the magnetron thermistor. 4. eplace all parts and panels before operating. 5. Plug in microwave oven or reconnect power. 6. If problem persists, unplug microwave oven or disconnect power. 7. eplace relay control board. 8. eplace all parts and panels before operating. 9. Plug in microwave oven or reconnect power. F6 M relay. Unplug microwave oven or disconnect power.. Check the cable from P85 to inverter. 3. Check to see if the relay (4903 on relay control board) contact has welded closed. 4. eplace all parts and panels before operating. 5. Plug in microwave oven or reconnect power. 6. If problem persists, unplug microwave oven or disconnect power. 7. eplace relay board. 8. eplace all parts and panels before operating. 9. Plug in microwave oven or reconnect power. 0. If problem persists, unplug microwave oven or disconnect power.. eplace relay control board.. eplace all parts and panels before operating. 3. Plug in microwave oven or reconnect power. F7 F9 Power to magnetron interrupted elay control board communications error. Unplug microwave oven or disconnect power.. After 40 seconds, check to see whether this solves the problem. 3. Unplug microwave oven or disconnect power. 4. Check cooling fan operation 5. Check the magnetron. 6. Check P65 connection on the relay control board. 7. Check the P56/P66 connection between relay board and relay control board. 8. Check wiring to the 00 inverter and control system. See Checking s. 9. Check operation of all interlock switches. 0. eplace all parts and panels before operating.. Plug in microwave oven or reconnect power.. Check voltage at 4903- on relay board. If it is 0, unplug microwave oven or disconnect power. 3. eplace inverter. 4. eplace all parts and panels before operating. 5. Plug in microwave oven or reconnect power. 6. If problem persists, unplug microwave oven or disconnect power. 7. eplace relay control board. 8. eplace all parts and panels before operating. 9. Plug in microwave oven or reconnect power. 0. If problem persists, unplug microwave oven or disconnect power.. Check for reversed plug connection on controls or loose wiring.. eplace all parts and panels before operating. 3. Plug in microwave oven or reconnect power.. Unplug microwave oven or disconnect power.. Check the communications cable from P66 to P56 between relay control board and relay board. 3. eplace all parts and panels before operating. 4. Plug in microwave oven or reconnect power. 5. If problem persists, unplug microwave oven or disconnect power. 6. eplace the relay board and relay control board. 7. eplace all parts and panels before operating. 8. Plug in microwave oven or reconnect power. 0
Display ikely Failure Condition ecommended epair Procedure F9.Q Touch communication. Unplug microwave oven or disconnect power.. Check the communications cable from UIB to the touch panel. 3. eplace all parts and panels before operating. 4. Plug in microwave oven or reconnect power. 5. If problem persists, unplug microwave oven or disconnect power. 6. eplace the door control assembly. 7. eplace all parts and panels before operating. 8. Plug in microwave oven or reconnect power. Component Tests Unplug microwave oven or disconnect power. emove the lead wires from the related component before conducting any of the following tests. Discharge the high-voltage capacitor and remove the lead wires from the primary winding of the high-voltage transformer before conducting any of the following tests. All operational checks using microwave energy must be done with the microwave oven loaded with a minimum of 8 oz (50 m) of water in a microwave safe container. IMPOTAT: Conduct a microwave energy test after performing any tests or repairs to the microwave oven. Check that all wire leads are in the correct position before operating the microwave oven. rasp wire connectors when removing the wire leads from microwave oven parts. All testing must be done with an ohmmeter having a sensitivity of 0,000 ohms per volt DC or greater, and powered by at least a 9-volt battery. Components Tests/esults Magnetron. Unplug microwave oven or disconnect power.. emove wire leads. Check that the seal is in good condition. Filament terminals: ormal: ess than ohm Filament to chassis: ormal: Infinite Cooling Fan Motor. Unplug microwave oven or disconnect power.. emove wire leads. ormal: 4 +/- 5 ohms FC Motor. Unplug microwave oven or disconnect power.. emove wire leads. ormal:.5 +/- 5 ohms Turntable Motor. Unplug microwave oven or disconnect power.. emove wire leads. ormal:.k +/- 0.5k ohms (approximate) Hood Exhaust Fan Motor. Unplug microwave oven or disconnect power.. emove wire leads. Pin () and (): ormal: 7 +/- 5 ohms; Abnormal: Infinite Pin () and 3 (): ormal: +/- 5 ohms; Abnormal: Infinite 3
Components Tests/esults AC ine. Unplug microwave oven or disconnect power.. emove wire leads. P34 P33 P3 and P3, P33 and P34: ormal: reater than or equal to 300k ohms; Abnormal: ess than or equal to 00k ohms P3 P3 and P34, P3 and P33: ormal: 0 ohms; Abnormal: reater than or equal to P3 00k ohms FC ing Heater. Unplug microwave oven or disconnect power.. emove wire leads. ormal: 9 +/- 3 ohms 3 Humidity Sensor. Unplug microwave oven or disconnect power. Y/. emove the 3-pin connector from elay Control Board. 3. Measure resistance across pins and 3, and across pins and 3: ormal:.8k ohms (approximate) at 77º +/- 0ºF (5º +/- 0ºC) s FC / rill / / aveguide Base Halogen rill Element 000, 0V (inside cavity) Start Quartz Tube 600, 60V (not visible to user) OTE: efer to Parts ayout for opening and closing temperatures.. Unplug microwave oven or disconnect power.. emove wire leads. 3. Measure continuity: FC, rill, and aveguide s: ormal: Continuity; Abnormal: Infinite Base : ormal: Infinite; Abnormal: Continuity. Unplug microwave oven or disconnect power.. emove wire leads. 3. Measure continuity (ohmmeter scale: x): ormal: +/- ohms. Unplug microwave oven or disconnect power.. emove wire leads. 3. Measure resistance (ohmmeter scale: x): ormal: 6 +/- 3 ohms Quartz rill Heater. Unplug microwave oven or disconnect power.. emove wire leads. ormal: 9 +/- 5 ohms FC Thermistor. Unplug microwave oven or disconnect power.. emove wire leads. ormal: 30k +/- 0% ohm at 77ºF (5ºC)
Components Tests/esults Magnetron Thermistor. Unplug microwave oven or disconnect power.. emove wire leads. ormal: 0k +/- 5% ohms at 77ºF (5ºC) Motor Capacitor. Unplug microwave oven or disconnect power.. emove wire leads. ormal: Momentarily 0 ohms, then goes to infinite FC Thermoactuator. Unplug microwave oven or disconnect power.. emove wire leads. ormal:.k +/- 0.5k ohms / Hood amp. Unplug microwave oven or disconnect power.. emove wire leads. ormal:.5 +/- 0.5 ohms elay Control Board 3 P6 P6 65 P63 P74 P73 P7 P66 700 P65 P67 P64 465 P68 OTE: Do not try to repair or make adjustments to the relay control board.. Unplug microwave oven or disconnect power.. Check wiring to relay control board. 3. Visually inspect P6, P6, P63, P64, P65, P66, P67, P68, P7, P73 and P74 to see whether there are signs of overheating or any signs of failure due to loose wires, bad crimping, etc. Hood / ight P P 450 450 4503 OTE: Do not try to repair or make adjustments to the hood/light switch.. Unplug microwave oven or disconnect power.. Check wiring to hood/light switch. 3. Visually inspect P to see whether there are signs of overheating or any signs of failure due to loose wires, bad crimping, etc. Power esistor- (0 ohm/ 5 ). Unplug microwave oven or disconnect power.. emove wire leads. ormal: 0 +/- ohm at 77ºF (5ºC) Power esistor- (4 ohm/50 ). Unplug microwave oven or disconnect power.. emove wire leads. ormal: 4 +/- ohm at 77ºF (5ºC) elay Board 574 P57 P58 P56 4903 493493 570 P54 470 4 39 P54 4905 494 4904 494 P53 P5 4907 490 4906 30 OTE: Do not try to repair or make adjustments to the relay board.. Unplug microwave oven or disconnect power.. Check wiring to relay board. 3. Visually inspect P5,, P53, P54, P55, P56 and P57 to see whether there are signs of overheating or any signs of failure due to loose wires, bad crimping, etc. 3
Checking s Measure Oven Input Current 5A Amps Connect an ammeter (Valhalla Scientific 0 or equivalent recommended) to measure the input current of microwave oven when the power level is set to evel 0 at the touch panel. If more than 0.5A: The 00 inverter is probably OK. Check the magnetron. See Magnetron test in Component Tests. If less than 0.5A: There is no input to the 00 inverter. Check the following:. Unplug microwave oven or disconnect power.. o AC voltage supply. Check relay control board and wiring. 3. o control signal. Check relay control board and wiring. Check the 00 H A B C OTE: Do not try to repair the inverter board, nor try to make any adjustments to the board. Check wiring to 00 inverter:. Unplug microwave oven or disconnect power.. Visually inspect 4 connectors on the 00 inverter board, C70, C70, C703, E70, to see whether there are signs of overheating or any signs of failure due to loose wires, bad crimping, etc. D F A. C70 B. Heat sink C. E70 D. High-voltage output to magnetron E E. C703 F. Control signal in/out. C70 H. 0V AC 4
otes 5
80593 / 469-65-9885 3/06 FO SEVICE TECHICIA S USE OY