Tech Sheet Do not discard ANING 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. PECAUTIONS TO BE OBSEVED BEFOE AND DUING SEVICING TO AVOID POSSIBLE EXPOSUE TO EXCESSIVE MICOAVE ENEGY 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 Loosening of Hinges and Latches 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. 8056 / 469-65-9803 FO SEVICE TECHNICIAN S USE ONLY
IING DIAGAMS Schematic Diagram 5 O 8 AC Line 8 O (P33) (P3) Quartz Heater B 3 B 9 30 0 Amp 55 B Cy 54 B Halogen Grill Element 3 33 Grill P Coil L Softstart Quartz Tube Humidity Sensor 9 Y 7 VD Cx Cx G P Cy P0 43 8 57 N 34 3 B 35 Display PCB & Power PCB (P3) 56 46 /3C CN70 P3 P P4 CN5 CN M elay 4903 Heater elay 4904 Grill elay Control 45 /3 C 00 494 79 CN5 Softstart elay 495 (P34) VD VD 40 P7 48 / C P45 TT elay 4906 INV elay 496 CN53 0V / 5V 60Hz 54 55 5 - CN70 P6 37 DC Fan elay 497 HF L N PK PK Y CN703 36 Door INV TT 9 E70 P4 CF CL 4 49 50 4 5 B Y 5 G 6 G 3 4 7 6P 5P P P SM Exhaust Fan Motor Capacitor 6 5 57 GY 56 GY Capacitor 5 O 9 53 7 O 0 7 O - 3 4 Ferrite 58 GY 38 B 5 0 B P0 3P0 9 Y HF TT 4 Y Y T 3 T HL -3 Monitor 40 39 HL 8 DG NO. MU-064 (ev. A) P/P3/P4/P5/P4/P6/P7/CN/CN5/CN5 /CN53/CN70/CN70/CN703: ire to PCB Connectors Hood Exhaust Fan Motor HF P0/P/P0/P: ire to ire Connectors Condition: Door opened. Symbol Notes CL Lamp B Turntable Motor ire Color - Brown ire No. - B: Brown O: Orange TT : hite G: Green Y: Yellow : Black : Blue : ed Hood Lamp (Cooktop Lamp) HL 45 6/3C ibbon Cable / 3 Core GY: Gray PK: Pink Cooling Fan Motor (DC Fan Motor) CF T: Transparent SM Stirrer Motor
Parts Layout (not to scale) B C D E F G EE A H I J K L M N O DD X P Q CC BB AA Z Y X U V T S A. Grill thermostat opens at 93ºF (45ºC), manual resets at 39ºF (5ºC), auto resets at -4ºF (-0ºC) B. thermostat opens at 39ºF (65ºC), closes at -3ºF (-35ºC) C. Halogen grill element D. Humidity sensor E. Softstart quartz tube F. Quartz heater G. Stirrer fan motor H. thermostat opens at 57ºF (5ºC), closes at -3ºF (-35ºC) I. Line fuse (0 amp) J. holder K. Hood exhaust fan motor L. Motor capacitor M. thermostat 3 opens at 57ºF (5ºC), closes at -3ºF (-35ºC) N. thermostat opens at 57ºF (5ºC), closes at 85ºF (85ºC) O. AC line filter P. Q. 00 inverter. 40 inverter S. V cooling fan motor T. capacitor U. Exhaust fan thermostat closes at 40ºF (60ºC), opens at 04ºF (40ºC) V. (4 amp). LCD (with touch panel) X. Hood (cooktop) lamps Y. Touch panel Z. Electronic control AA. interlock switch BB. Monitor interlock switch CC. interlock switch DD. Turntable motor EE. lamp,, and Monitor Checkout Procedure Check By Door Open Door Closed. Disconnect the wires at the. 3. Check from the common terminal (blue/black wires) to the normally open terminal (white wire).. Disconnect the wires at the. 3. Check from the common terminal (orange/yellow wires) to the normally open terminal (red/black wires).. Disconnect the wires at the. 3. Check from the common terminal (orange/yellow wires) to the normally closed terminal (orange wire). - + - + + - 3
3,, and Monitor Checkout Procedure Check By Door Open Door Closed Monitor. Disconnect the wires at the Monitor. 3. Check from the common terminal (white/blue wires) to the normally closed terminal (yellow/brown wires). + - (+) Continuity (-) No Continuity NOTE: These diagrams are not intended to show a complete circuit; they represent the position of switches during DOO OPEN or DOO CLOSED (continuity checks only). Door Closed L (NC) (NO) (NC) N (NO) (NC) (NO) 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:. Check for loose wiring or incorrect wiring within microwave oven. Microwave Cooking Monitor Door Open TOUBLESHOOTING L (NC) (NO) (NC) N (NO) (NC) (NO) Monitor 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 ml) of water in a microwave safe container. L B B B O P 0 Amp Display PCB & Power PCB M elay 4903 P ibbon Cable/3C GY CN70 3 CN70 00 E70 CN703-3 - N P P0-4
3 Microwave and Grill Combination Cooking L 0 Amp B B B P Grill O Quartz Heater Halogen Grill Element Softstat Quartz Tube B Display PCB & Power PCB M elay 4903 Heater elay 4904 P Grill elay 494 Softstat elay 495 GY ibbon CN70 Cable/3C CN70 3 CN703 00 E70-3 - - N P P0 Grill Cooking Grill Display PCB & Power PCB L Heater elay Quartz Heater B B B O B 4904 P Browner elay 0 Amp Halogen Grill Element 494 Softstat Quartz Tube Softstat elay 495-3 - - N P P0 Hood Exhaust Fan Turns On Automatically L B B B P 0 Amp O Y Exhaust Fan B B Motor Capacitor Hood Exhaust Fan Motor - 3-3P0 HF P0 P P0 - N 5
Hood Exhaust Fan On Display PCB & P P0 L 0 Amp Power PCB B B B O Y B B B G G Control 4P4 P4 P Hood Exhaust Y 6P4 Fan Motor - 3 - HF Triac 79 3P0 HF P0 - Motor Capacitor N Microwave Oven Plugged In Time of Day Displayed Display PCB & - 3 - L 0 Amp Power PCB B O Y B B B 4P4 P4 G G B B Control P P P0 Door Open Oven Light is On - N L 0 Amp B B B O P Lamp PK PK CN5 Y CN 40 B B B 4P4 O 5P4 P4 3 4 CN5 ibbon Cable/3C P4 3 4 Control elay 496 Display PCB & Power PCB P4-3 - G G N P P0 - Cooktop Light On L B 0 Amp B B O P Hood Lamps (Cooktop Lamps) T T P Y Y Y P CN5 4 3 Display PCB & Power PCB Y B B B Control 4P4 G G P4 P4 ibbon Cable/3C elay CN 496 40 34 CN5 P4 34-3 - - P P0 N 6
Touch Panel and Test Touch Panel The microwave hood combination is provided with a self-diagnostic routine that can be accessed through the touch keypad. To access the test mode:. Press the clock key.. Press keys, and 3 on the keyboard. 3. Touch AM/PM on the touch screen and set for AM. 4. Touch :3 on the touch screen. You are now in the test mode. The screen display will appear as shown in the Test Mode Table. NOTE: If the OFF/CANCEL key is pressed during this diagnostic routine, you will exit the test mode. Test Mode Table Screen Display Program Version Oven Status Display Explanation Version number Current Error (if any) e.g., F0=No Error. See Failure Code/Indications. Stop eason Table Stop eason displays how the last run cooking cycle was stopped. The table below lists all possible codes. Code Displayed Last Stop eason 0 Power reset Door opened Cook time elapsed 3 Cancel key pressed 4 error 5 Humidity sensor error Stop eason eason cooking cycle interrupted. See Stop eason Table. 6 Temperature sensor error Humidity Normal range: 89-867 7 Touch foil error Temperature Normal range: 46-00 FF No cooking cycle stopped Night Light ange: 0-55 Varies depending on ambient light. Value should be near 0 when light sensor opening is covered.. Place 8 oz (50 ml) of lukewarm water in the center of the microwave oven.. Operate on HIGH power level for minutes. ater should be hot. Microwave Oven Power Output Test Failure Codes Indications Display Likely Failure Condition ecommended epair Procedure F0 No error None NOTE: 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. FK FT Key or foil pressed more than minute Touch panel pressed more than minute. eplace touch panel. 3. If problem persists, replace electronic control. 4. Plug in microwave oven or reconnect power.. eplace the LCD. 3. If problem persists, replace electronic control. 4. Plug in microwave oven or reconnect power. 7
Display Likely Failure Condition ecommended epair Procedure F3H F3T F7 F9M Humidity sensor out of range Temperature sensor out of range Power to magnetron interrupted EPOM (Electrically Erasable Programmable ead-only Memory) missing. Check plug (P3) connection. 3. Connect a new sensor to the electronic control (at P3). 4. Plug in microwave oven or reconnect power. 5. If problem persists, unplug microwave oven or disconnect power. 6. eplace electronic control. 7. Plug in microwave oven or reconnect power.. eplace electronic control. 3. Plug in microwave oven or reconnect power.. After 40 seconds, check to see whether this solves the problem. 3. Unplug microwave oven or disconnect power. 4. Check resistance of the magnetron thermostat. 5. Check the magnetron. 6. Check wiring to the 00 inverter and control system. See Checking s. 7. Plug in microwave oven or reconnect power. 8. Check operation of all interlock switches. Check door, hinge and cavity front alignment. Adjust as needed. 9. Unplug microwave oven or disconnect power. 0. If switches operate correctly, replace 00 inverter.. If problem persists, replace electronic control.. Plug in microwave oven or reconnect power.. eplace electronic control. 3. Plug in microwave oven or reconnect power. F9E EPOM empty. eplace electronic control. 3. Plug in microwave oven or reconnect power. F9C EPOM Checksum error. eplace electronic control. 3. Plug in microwave oven or reconnect power. F9 EPOM write error. eplace electronic control. 3. Plug in microwave oven or reconnect power. F0 Display error. Check that the ribbon cables between the display electronic control and the electronic control at P and P are securely connected. 3. Plug in microwave oven or reconnect power. 4. If problem persists, unplug microwave oven or disconnect power 5. eplace electronic control. 6. Plug in microwave oven or reconnect power. NOTE: If lights work, but cooling fan does not, 40 inverter might have failed. See Checking s. 8
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 ml) of water in a microwave safe container. IMPOTANT: Conduct a microwave energy test after performing any tests or repairs to the microwave oven. Check that all wire leads are in the correct positions before operating the microwave oven. Grasp 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 Test/esults. emove wire leads. Check that the seal is in good condition. Antenna 3. Measure resistance (ohmmeter scale: x): Gasket Filament terminal: Normal: Less than ohm 4. Measure resistance (ohmmeter scale: xk): Filament to chassis: Normal: Infinite Filament DC Cooling Fan Motor. emove wire leads. 3. Using an external 9 or DC voltage source, connect to fan wires: red () wire to + and black () wire to -. Fan should work. 4. If it does not work, unplug the 9 or DC voltage source. 5. eplace fan. Turntable Motor/ Stirrer Motor. emove wire leads. 3. Measure resistance (ohmmeter scale: xk): Turntable Motor: Normal:.7k-3.8k ohms (approximate); Abnormal: Infinite Stirrer Motor: Normal: 3.3k-4.k ohms (approximate); Abnormal: Infinite Hood Exhaust Fan Motor. emove wire leads. 3. Measure resistance (ohmmeter scale: x): Normal: Black ( ) Black ( ): 30-60 ohms (approximate); Black ( ) Black 3 ( 3): 40-80 ohms (approximate) 3 Abnormal: Infinite Humidity Sensor esistor. emove the 3-pin connector from electronic control (P3). NOTE: Do not remove the attached resistor, which is used for internal resistance calibration. 3. Measure resistance across pins and 3, and across pins and 3 (ohmmeter scale: xk): Normal:.8k ohms (approximate) at 77º +/- 8ºF (5º +/- 0ºC) Abnormal: Infinite 9
Components s Grill Test/esults NOTE: efer to Parts Layout for opening and closing temperatures.. emove wire leads. 3. Measure continuity (ohmmeter scale: x):, and Grill s: Normal: Continuity; Abnormal: Infinite Exhaust Fan : Normal: Infinite; Abnormal: Continuity Exhaust Fan AC Line. emove wire leads. P34 P33 3. Measure resistance (ohmmeter scale: x0k): P3 and P3, P33 and P34: Normal: Greater than or equal to 300k ohms; Abnormal: Less than 00k ohms P3 P3 and P34, P3 and P33: Normal: 0 ohms; Abnormal: Greater than 00k ohms P3 Halogen Grill Element 000, 0V (inside cavity). emove wire leads. 3. Measure continuity (ohmmeter scale: x): Normal:.5k ohms (approximate) Abnormal: Infinite Softstart Quartz Tube 600, 60V (not visible to user). emove wire leads. 3. Measure resistance (ohmmeter scale: x): Normal: 6 ohms (approximate) Abnormal: Infinite Quartz Heater 500, 0V (inside cavity). emove wire leads. 3. Measure resistance (ohmmeter scale: x): Normal: 7 ohms (approximate) Abnormal: Infinite 0
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 Level 0 at the touch panel. If more than 0.5A: The 00 inverter is probably OK. Check the magnetron. See test in Component Tests. If less than 0.5A: There is no input to the 00 inverter. Check the following:. No AC voltage supply. Check electronic control and wiring. 3. No control signal. Check electronic control and wiring. Check the 00 H A B C NOTE: Do not try to repair the inverter board, nor try to make any adjustments to the board. Check wiring to 00 inverter:. Visually inspect 4 connectors on the 00 inverter board, CN70, CN70, CN703, E70, to see whether there are signs of overheating or any signs of failure due to loose wires, bad crimping, etc. G D F A. CN70 B. Heat sink C. E70 D. High-voltage output to magnetron E E. CN703 F. Control signal in/out G. CN70 H. 0V AC Check the 40 A B C D E F NOTE: Do not try to repair the inverter board, nor try to make any adjustments to the board. Check wiring to 40 inverter:. Visually inspect 4 connectors on the 40 inverter board, CN, CN5, CN5, CN53, to see whether there are signs of overheating or any signs of failure due to loose wires, bad crimping, etc. G I H A. 0V main input B. CN C. CN5 D. CN5 E. Control signal input F. V halogen lamps and cavity lamps output G. V cooling fan output H. CN53 I. Heat sink
8056 / 469-65-9803 /05 FO SEVICE TECHNICIAN S USE ONLY