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. 8067 / 469-65-9887 FO SEVICE TECHICIA S USE OY
5 P8 T 3 Y P8 P58 P P63 Y/5C Y / 3C UIB CD P3 / / 0 C P7 P74 / 3 C 8P8 Magnetron II DIAAMS Schematic Diagram 3 O 4 B B B 0V/5V,60Hz AC ine 5 P84 6 43 T P3 Cy P33 D Coil Cx Cx VD Monitor FC P83 4 CF FC P83 FCTH 55 5P8 H H 3 8 Y 5 50 6P8 4P8 3P8 P9 TT P9 Base 8 Cy 7 B C70 elay Board Quartz rill Heater P53 TT Inverter FC ing Heater 9 6 4 Y 40 Y 39 36 35 B 49 P84 rill P34 P3 33 P54 elay 494- Door FS P6 C VD VD P35 CF FCFA P57 P67 3 HF Triac 790 P56 4 P66 56 53 3 B 0 34 54 FC Thermistor P85 P87 5 Halogen rill Element P88 3 0 Start Quartz Tube P89 M elay 4903 FCFA elay 4907 CF elay 490 TT elay 4906 elay Control Board P64 Melay feedback UIB Thermistor P86 FCH 500mA 3 P6 Magnetron Thermistor C70 elay 4905 Heater elay 4904 rill elay 494 Start elay 494 500mA 470 4 P55 P65 7 0 P5 P5 Inverter P90 C70 7 C703 E70 Y Inverter P68 4 37 P73 57 58 7P8 45 Y/ 47 46 P6-/FS 38 / 3P8 P8 P8 P Secondary Motor Capacitor 0uF Hood Exhaust Fan Motor Hood/ight Humidity Sensor 9 HF aveguide 9 8 6 5 P/P3/P3/P33/P34/P35/P5/P5/P53/P54/P55/P56/P57 /P58/P6/P6/P63/P64/P65/P66/P67/P68/P7/P7/P73/ P74/C70/C70/C703: ire to PCB Connectors Hood Exhaust Fan Motor HF D O. MU-08 CF Condition: Door Open. Symbol otes C amp B P8/P8/P83/P84: ire to ire Connectors P85/P86/P87/P88/P89/P90: ire to elay Connectors Cooling Fan Motor ire Color - Brown ire o. - B: Brown O: Orange : hite : reen Y: Yellow : Black : Blue : ed FC (Forced Convection) Fan Motor FC Hood amp (Cooktop amp) H / 3C ibbon Cable Awg / 3 Core Y: ray Turntable Motor TT T: Transparent FCTH FC (Forced Convection) Thermoactuator
Parts ayout (not to scale) HH FF DD EE A B C D E F CC BB H I J K Y M II JJ AA Z U Y X V U T S Q P O 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 -63.4ºF (-53ºC) F. AC line filter. elay board H. Magnetron thermistor I. Magnetron J. Secondary interlock switch K. FC thermoactuator. Ferrite ring M. Inverter. 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. Base thermostat closes at 40ºF (60ºC), opens at 04ºF (40ºC) X. Turntable motor Y. Touch panel (back and front views) Z. lamp AA. Hood/light switch BB. FC motor CC. FC thermostat opens at 39ºF (65ºC), closes at 57ºF (5ºC) DD. FC ring heater EE. FC thermistor FF. Humidity sensor. thermostat opens at 39ºF (65ºC), closes at -ºF (-30ºC) HH. Door control assembly (back view) (includes the touch panel only) II. UIB (user interface board) JJ. CD module, 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) (C) (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. Inverter and Magnetron Circuit Secondary Door Open TOUBESHOOTI (C) (O) (C) (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 B elay Board M elay 4903 ibbon P56 0 Cable P66 ibbon elay Control Board Cable 3 P65 C70 3 aveguide Secondary Magnetron C70 Inverter C703 Halogen rill Heater Circuit B B rill Halogen rill Element rill elay 494 elay Board Secondary aveguide Quartz rill Heater Circuit B B rill Heater elay Quartz rill Element 4904 elay Board Secondary aveguide 4
Start Quartz Tube Circuit B rill Halogen rill Element B Start elay 494 Start Quartz Tube elay Board Secondary aveguide Forced Convection Circuit FC Y FCTH Y 3P53 4P53 FCFA elay 4907 B B B FC ing Heater B FC P5 elay Board FCH elay 4905 P5 ave Hood Exhaust Fan On (Variable Speed) B B HF B 500mA P8 B 470 4P54 7P8 5P8 Inverter Motor Capacitor 3P8 8P8 HFTriac P54 P8 3P8 790 P5 elay Board P5 aveguide Cooling Fan Motor Circuit B 0 A m p B P83 P53 CF CF elay B 490 P83 4P54 aveguide 5P8 B P5 P5 elay Board 5
Turntable Motor Circuit TT 6P8 P53 TT elay 4906 B B 5P8 B 4P54 B P5 P5 elay Board aveguide Door Open Oven ight is On B B B P5 470500mA 4 elay Board 500mA Inverter P5 aveguide O P6 P55 P55 3P55 3 P6 elay Control Board P63 amp Cooktop ight On (Variable ight) elay Board aveguide B 470 500mA B B P5 P5 O P6 4 500mA Inverter P55 P55 3P55 3 P6 elay Control Board P58 P63 P8 P8 P84 T T Y H H Y P84 amp Hood Exhaust Fan On Auto B B B P5 elay Board 4 P54 P5 4P8 Motor 7P8 Capacitor 8P8 B 5P8 P8 HF 3P8 Base P8 aveguide 6
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. 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. Test Mode Table 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. Screen Display Display Explanation Screen Display Display Explanation UIB S ver PB S Ver Flash FC thermistor (ºC) Version number of UIB (user interface board) software Version number of power board (relay control board) software The temperature (ºC) measured by FC (forced convection) thermistor maximum 50ºC Hood Key Touch panel EEPOM Hood key number Touch panel error Version number of PB (relay control board) EEPOM (Electrically Erasable Programmable ead-only Memory) UIB thermistor (ºC) Magnetron thermistor (ºC) HUM PM The temperature (ºC) measured by UIB (user interface board) thermistor ranges about 5ºC above room temperature, if oven has not been used recently The temperature (ºC) measured by magnetron thermistor maximum 5ºC Humidity level inside unit ranges between 8,000 and 9,500, depending on humidity level in oven cavity M reply error Smps FB error Hum sensor error thermistor error M relay error Smps feedback error Humidity sensor error thermistor error Magnetron thermistor error Magnetron thermistor error EEPOM error Power board (relay control board) error 7
. 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. 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. Failure Codes Indications 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. Plug in microwave oven or reconnect power. F.H Hood keys stuck. Unplug microwave oven or disconnect power.. eplace hood/light switch. 3. 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. 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. 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. Plug in microwave oven or reconnect power. 5. If problem persists, unplug microwave oven or disconnect power. 6. eplace relay control board. 7. 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. Plug in microwave oven or reconnect power. 4. If problem persists, unplug microwave oven or disconnect power. 5. eplace relay control board. 6. Plug in microwave oven or reconnect power. 7. If problem persists, unplug microwave oven or disconnect power. 8. eplace the UIB. 9. 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. Plug in microwave oven or reconnect power. 5. If problem persists, unplug microwave oven or disconnect power. 6. eplace relay control board. 7. Plug in microwave oven or reconnect power. F3.T4 Magnetron thermistor. Unplug microwave oven or disconnect power.. Check magnetron thermistor connection. 3. eplace the magnetron thermistor. 4. Plug in microwave oven or reconnect power. 5. If problem persists, unplug microwave oven or disconnect power. 6. eplace relay control board. 7. Plug in microwave oven or reconnect power. 8
Failure Codes Indications Display ikely Failure Condition ecommended epair Procedure 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 board) contact has welded closed. 4. Plug in microwave oven or reconnect power. 5. If problem persists, unplug microwave oven or disconnect power. 6. eplace relay board. 7. Plug in microwave oven or reconnect power. 8. If problem persists, unplug microwave oven or disconnect power. 9. eplace relay control board. 0. 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 Inverters. 9. Check operation of all interlock switches. 0. Plug in microwave oven or reconnect power.. Check voltage at 4903- on relay board. If it is 0, unplug microwave oven or disconnect power.. eplace inverter. 3. Plug in microwave oven or reconnect power. 4. If problem persists, unplug microwave oven or disconnect power. 5. eplace relay control board. 6. 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. Plug in microwave oven or reconnect power. 4. If problem persists, unplug microwave oven or disconnect power. 5. eplace the relay board and relay control board. 6. Plug in microwave oven or reconnect power. F9.Q Touch communication. Unplug microwave oven or disconnect power.. Check the communications cable from UIB to the touch panel. 3. Plug in microwave oven or reconnect power. 4. If problem persists, unplug microwave oven or disconnect power. 5. eplace the door control assembly. 6. 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. 9
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 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) 0
Components s FC / rill / / aveguide Base Halogen rill Element 000, 0V (inside cavity) Start Quartz Tube 600, 60V (not visible to user) Tests/esults 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) 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
Components Tests/esults 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. elay Board 574 P57 P58 P56 4903 493493 570 P54 470 4 39 P54 4905 494 4904 494 P53 P5 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, 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. Checking Inverters 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 Inverter 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 8067 / 469-65-9887 /06 FO SEVICE TECHICIA S USE OY