tech-sheet-8205619
Tech Sheet Do not discard

WARNING

Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock.

PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE

MICROWAVE ENERGY

a. Do not operate or allow the oven to be operated with d. Any defective or misadjusted components in the the door open. interlock, monitor, door seal, and microwave generation and transmission systems shall be repaired, b. Make the following safety checks on all ovens to be replaced, or adjusted by procedures described in serviced before activating the magnetron or other service manual before the oven is released to the microwave source, and make repairs as necessary: owner.

1. Interlock Operation e. A microwave leakage check to verify compliance with the Federal Performance Standard should be 2. Proper Door Closing performed on each oven prior to release to the owner.

3. Seal and Sealing Surfaces (Arcing, Wear and Other f. Do not attempt to operate the oven if the door glass is Damage) broken.

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.

Models: 665.63792303, 665.63793303, 665.63794303, 665.63799303 FOR SERVICE TECHNICIAN’S USE ONLY 665.63792304, 665.63793304, 665.63794304, 665.63799304 665.63792305, 665.63793305, 665.63794305, 665.63799305

8205619 / 4619-651-97954

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AC Line Filter Secondary Interlock (P32) (P33) Fuse 8 OR Switch 5 OR 28 R 54 BR 55 BR 1 BR Quartz Heater Cy 20 Amp 29 BK 30 BU 32 BR L BK Cx G 2P0 Cx R Coil Cy 1P1 Grill Thermostat Halogen Grill Element

GND VDR 31BK 33BK N W 1P0 2P1 7 R 1 Humidity Start Quartz Tube 9 Y Sensor 43 Y/G 56 BU 57 BU 2 BU 134 W WIRING DIAGRAMS 120V / 125V 60Hz (P31) (P34) Y/G BK Electronic Control 32 BR P45 VDR VDR GND R 1 Schematic Diagram W 28 R2 Cavity 1 Thermostat-1 1 P3 1 Display PCB MW 46 W/3C CN701 Cavity Relay P2 Thermostat-2 1 & Power PCB 2 1100W Cavity 49031 Inverter Thermostat-3 CN1 CN151 45 W/3 C Control Heater 54 R CN702 40W P4 Inverter Relay 55 R CN703 GND E701 InverterCN153 INV TT 49044914 Relay Relay 2 2 SM P27 4916 4906 Grill Relay Magnetron 1CN152 48 W/2 C 1 Thermostat 35 R PK1 DC Fan PK Relay Start 22 Y 4917 Relay 4915 21 W 7911 19 BU 15R 1 1

3 BU P261 N1 INV TT L1 Door HF 5 OR 37 W R P14 1 36 BK 56 GY CL CF BK 52 BR 42 Y/G 41 Y/G 19 BU 27 OR 53 BK 20 R Ferrite 27 OR 51 G Fuse 38 BU 11 BR 49 W 2P11 5P11 6P11 26 BU1P11 17 BK 12 Y 57 GY 50 W

25 BU BK 16 G 4 Amp Filter Magnetron 24 W Y Capacitor Y 1P10 13 W Exhaust Fan TR 23 W TR BK 14 W

4 BU HF BK 2P10 Motor Thermostat 58 GY Capacitor HL 9 Y 15 R 10 BR Fuse TT 3P10 Monitor HL Primary Interlock 4 Amp 18 BU Interlock 40 W Switch 39 BU Switch

Condition: Door opened. Hood Exhaust P2/P3/P4/P5/P14/P26/P27/CN1/CN151/CN152 Symbol Notes HF Fan Motor /CN153/CN701/CN702/CN703: Wire to PCB Connectors DWG NO. MU-064 (Rev. A)

CL Cavity Lamp TT Turntable Motor P0/P1/P10/P11: Wire to Wire Connectors 1 BR

HL Hood Lamp BK: Black W: White BR: Brown Wire Color – Brown (Cooktop Lamp) Cooling Fan Motor BU: Blue G: Green OR: Orange Wire No. – 1 CF (DC Fan Motor) Y: Yellow GY: Gray 45 W26/3C Ribbon Cable / 3 Core SM Stirrer Motor R: Red TR: Transparent PK: Pink

Parts Layout

(not to scale)

D E C F B G

A HI EE J DD K L M N O

X P

Q

CC BB R AA A. Grill thermostat—opens at S 293ºF (145ºC), manual resets Z T at 239ºF (115ºC), auto resets at Y VU -4ºF (-20ºC) (8184840) X W

B. Cavity thermostat 1—opens at J. Fuse holder (4393538) V. Fuse (4 amp) (8184579) 329ºF (165ºC), closes at -31ºF K. Hood exhaust fan motor (8184876) W. LCD (with touch panel) (-35ºC) (8183999) L. Motor capacitor (8184092) M. Cavity thermostat 3—opens at 257ºF (125ºC), (8184914) C. Halogen grill element (8184837) X. Hood (cooktop) lamps D. Humidity sensor (4393808) closes at -31ºF (-35ºC) (8184586) E. Start quartz tube (8184838) N. Magnetron thermostat—opens at 257ºF (8169418) F. Quartz heater (8184839) Y. Touch panel G. Stirrer fan motor (4393746) (125ºC), closes at 185ºF (85ºC) (8184951) H. Cavity thermostat 2—opens at O. AC line filter (8205853) (WT-8184842, BK-8184843, P. Magnetron (8183990) BI-8184844, SS-8184845) 257ºF (125ºC), closes at -31ºF Q. 1100W inverter (8183997) Z. Electronic control (8184841) (-35ºC) (8184585) R. 40W inverter (8184952) AA. Secondary interlock switch I. Line fuse (20 amp) (4393308) S. 12V cooling fan motor (8184875) (4393697) T. Filter capacitor (8184093) BB. Monitor interlock switch U. Exhaust fan thermostat—opens at 104ºF (4393598) CC. Primary interlock switch (40ºC), closes at 140ºF (60ºC) (8183998) (4393599) DD. Turntable motor (4393755) EE. Cavity lamp (8169418)

Primary, Secondary, and Monitor Interlock Switch Checkout Procedure

Switch Check By Door Open Door Closed

Primary 1. Unplug microwave oven or disconnect power. – + Interlock 2. Disconnect the wires at the Primary Interlock Switch.

3. Check from the common terminal (blue/black wires) to the normally open terminal (white wire).

1. Unplug microwave oven or disconnect power. – + 2. Disconnect the wires at the Secondary Interlock Switch. Secondary 3. Check from the common terminal (orange/yellow wires) to the Interlock normally open terminal (red/black wires). + – 1. Unplug microwave oven or disconnect power. 2. Disconnect the wires at the Secondary Interlock Switch. 3. Check from the common terminal (orange/yellow wires) to the

normally closed terminal (orange wire).

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Primary, Secondary, and Monitor Interlock Switch Checkout Procedure

Switch Check By Door Open Door Closed

Monitor 1. Unplug microwave oven or disconnect power. + – Interlock 2. Disconnect the wires at the Monitor Interlock Switch.

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 “DOOR OPEN” or “DOOR CLOSED” (continuity checks only).

Door Closed Door Open

L (NC) (NO) (NC) N L (NC) (NO) (NC) N

(NO) (NC) (NO) (NO) (NC) (NO)

Secondary Monitor Primary Secondary Monitor Primary Interlock Interlock Interlock Interlock Interlock Interlock Switch Switch Switch Switch Switch Switch

TROUBLESHOOTING

Do not continue with the diagnostics of appliance if the 3. Disconnect white wire from power transformer and household fuse is blown, a circuit breaker is tripped or if there discharge high-voltage capacitor. is less than 120-volt power supply at the wall outlet. 4. All testing must be done with an ohmmeter having a Complete the following steps before checking microwave sensitivity of 20,000 ohms per volt DC or greater, and oven circuitry: powered by at least a 9-volt battery.

1. Unplug microwave oven or disconnect power. 5. All operational checks using microwave energy must be done with the microwave oven loaded with a minimum of 2. Check for loose wiring or incorrect wiring within 8 oz (250 mL) of water in a microwave safe container. microwave oven.

Microwave Cooking

Secondary Electronic Control Magnetron Primary Display PCB Thermostat Interlock & Power PCB Interlock L1 BK BR Filter BR BR OR Switch R MW Relay R GY BU W Switch BU 4903 1P1 1 Fuse 2

2P0 20 Amp Cavity Thermostat – 3 Ribbon CN702 Magnetron BU Cable/3C W Cavity 1100W W Thermostat – 2 Inverter CN703E701 Y/G

CN701 1 23

3 21 P2

BU

Cavity

Thermostat – 1

BU Filter N

BU BU W

2P1 1P0

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Microwave and Grill Combination Cooking

Electronic Control Magnetron Display PCB & Power PCB Thermostat

Fuse Secondary Primary

L1 Filter 20 Amp Interlock MW Relay Interlock OR Switch BK BR BR BR R 4903 R GY BU W Switch BU

2P0 2 1

1P1 BU Cavity Magnetron Thermostat – 3 BK Ribbon CN702 W Cable/3C

CN703 BU

CN701 1 23 3 21

P2 1100W W

Inver ter E701 Y/G Cavity Thermostat – 2

Grill BU Thermostat Heater Relay Cavity

4904 Thermostat – 1

BU Quartz Heater BR 1 BK BU Filter N W 2 BU BU W

Halogen Grill Element BK W Grill Relay 2P1 1P0

BK 4914 BU

Start Quartz Tube 2 1

Start Relay

R 4915

2 1 BK

Grill Cooking

Electronic Control

Grill Display PCB & Power PCB Thermostat

L1 Filter Fuse Quartz Heater Heater Relay 4904 BK BR BR BR OR BK BU BR BK 1 W 2P0 2

1P1 Secondary Halogen Grill Element Browner Relay 20 Amp Interlock 4914 BK BK BU BU W BU W2 Switch 1 Cavity Start Quartz Tube Thermostat – 3 Start Relay Primary Interlock R2 4915 BK

1 Switch BU

Cavity

Thermostat – 2

BU

Cavity

Thermostat – 1

BU Filter N

BU BU W

2P1 1P0

Hood Exhaust Fan Turns On Automatically

Exhaust Fan

Fuse Thermostat Fuse

L1 Filter 20 Amp 4 Amp Hood Exhaust BK BR BR BR OR Y BR BR W Fan Motor Cavity Cavity 2P0 1P1 W 2P10 BK Thermostat – 3 Thermostat – 1 Filter N

R 3P10 BK HF BK BK BU BU BU BU BU BU W 1P10 Cavity 2P1 1P0

Motor Thermostat – 2

Capacitor

5

Hood Exhaust Fan On

Electronic Control Filter N

Display PCB & BU BU W

Fuse Fuse Fuse 2P1 1P0

L1 Filter 20 Amp 4 Amp Power PCB 4 Amp BU

BK BR BR BR OR Y BR BR BR Control 1P14 G G

2P0 1P1 4P14 Inverter

Y/G GND 6P14 Y Hood Exhaust Cavity Cavity

W 2P10 Fan Motor Thermostat – 3 Thermostat – 1 W BK BU BU HF Triac 7911 R 3P10BK HF BK BK BU Cavity BU 1P10

Motor Thermostat – 2

Capacitor

Microwave Oven Plugged In—Time of Day Displayed

Electronic Control Cavity Cavity

Fuse Display PCB & Fuse Thermostat – 3 Thermostat – 1 Filter L1 Filter 20 Amp Power PCB 4 Amp BU N

BK BR BR BR OR Y BR BR BR 4P14 Control 1P14 G G BK BU BU BU BU BU W 2P0 1P1 Inverter GND Y/G Cavity 2P1 1P0

Fuse Thermostat – 2

4 Amp

Door Open—Oven Cavity Light is On

Electronic Control Cavity Cavity

Fuse Fuse Thermostat – 3 Thermostat – 1 Filter

4 Amp Control 4 Amp N Inverter Y BR BR BR G G BK BU BU BU BU BU BU W

Fuse 4P14 1P14

20 Amp OR 5P14 Cavity 2P1 1P0

L1 Filter Secondary Thermostat – 2

BK BR BR BR OR Interlock Inverter Relay

2P0 1P1 R Switch BU 4916

2P14

Cavity PK 12 Ribbon Lamp PK CN1 Cable/3C P4 Display PCB & GND Y/G Y/G GND 123440W Power PCB Inverter 1234 CN151

CN152 12

Cooktop Light On

Fuse Electronic Control

L1 20 Amp Fuse Display PCB & Power PCB Fuse 4 Amp 4 Amp BK BR Filter BR BR OR Y BR Control G BK BU 2P0 1P1 Inverter Cavity BR BR 4P14 1P14 G

Hood Lamps R BU BU BU BUThermostat – 3

(Cooktop Lamps) 12 2P14 Inverter Relay Cavity CN1 4916 Thermostat – 2 TR W 2P11 W Ribbon GND Y/G TR Cable/3C P4 Y Y 12 34

1 2 34 CN151

CN152 43 40W Y W 1P11 Inver ter GND Y/G Cavity

Thermostat – 1 N Filter BU BU W

2P1 1P0

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Touch Panel

Touch Panel and Electronic Control Test

The microwave hood combination is provided with a self-diagnostic routine that can be accessed through the touch keypad.

To access the test mode: Stop Reason Table 1. Press the clock key. “Stop Reason” displays how the last run cooking cycle was 2. Touch “Hours” on the touch screen and set hours to “1.” stopped. The table below lists all possible codes. 3. Touch “Minutes” on the touch screen and set minutes to Code Displayed Last Stop Reason “23.” 4. Select “AM.” 0 Power reset 5. Touch “1:23” on the touch screen. You are now in the test 1 Door opened mode. The screen display will appear as shown in the “Test Mode Table.” 2 Cook time elapsed NOTE: If the STOP/CLEAR button is pressed during this diagnostic routine, you will exit the test mode. 3 Cancel key pressed

Test Mode Table

Screen Display Display Explanation

Program Version Version number 4 Inverter error

Oven Status Current Error (if any) e.g., F0=No 5 Humidity sensor error Error. See “Failure Code/Indications.” 6 Temperature sensor error

Stop Reason Reason cooking cycle interrupted. 7 Touch foil error See “Stop Reason Table.”

Humidity Normal range: 8191-28671 FF No cooking cycle stopped

Temperature Normal range: 46-100

Night Light Range: 0-255

Varies depending on ambient light. Value should be near 0 when light sensor opening is covered.

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Microwave Oven Power Output Test

1. Place 8 oz (250 mL) of lukewarm water in the center of the NOTE: If the water takes longer than 2 minutes to heat, this microwave oven. may indicate either the operating voltage is lower than 110 volts or there is a problem with the microwave oven. 2. Operate on HIGH power level for 2 minutes. Water should be hot.

Failure Codes Indications

Display Likely Failure Condition Recommended Repair Procedure F0 No error F2K Key or foil pressed more None F2T than 1 minute F3H 1. Unplug microwave oven or disconnect power. Touch panel pressed 2. Replace touch panel. F3T more than 1 minute 3. If problem persists, replace electronic control. F7 4. Plug in microwave oven or reconnect power. Humidity sensor out of F9M range 1. Unplug microwave oven or disconnect power. F9E 2. Replace the LCD. F9C Temperature sensor out 3. If problem persists, replace electronic control. F9W of range 4. Plug in microwave oven or reconnect power. Power to magnetron interrupted 1. Unplug microwave oven or disconnect power. 2. Check plug (P3) connection. E2PROM (Electrically 3. Connect a new sensor to the electronic control (at P3). Erasable Programmable 4. Plug in microwave oven or reconnect power. Read-only Memory) 5. If problem persists, unplug microwave oven or disconnect power. missing 6. Replace electronic control. E2PROM empty 7. Plug in microwave oven or reconnect power.

E2PROM Checksum 1. Unplug microwave oven or disconnect power. error 2. Replace electronic control. E2PROM write error 3. Plug in microwave oven or reconnect power.

1. Unplug microwave oven or disconnect power. 2. 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 1100W inverter and control system. See “Checking

Inverters.” 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. 10. If switches operate correctly, replace 1100W inverter. 11. If problem persists, replace electronic control. 12. Plug in microwave oven or reconnect power.

1. Unplug microwave oven or disconnect power. 2. Replace electronic control. 3. Plug in microwave oven or reconnect power.

1. Unplug microwave oven or disconnect power. 2. Replace electronic control. 3. Plug in microwave oven or reconnect power.

1. Unplug microwave oven or disconnect power. 2. Replace electronic control. 3. Plug in microwave oven or reconnect power.

1. Unplug microwave oven or disconnect power. 2. Replace electronic control. 3. Plug in microwave oven or reconnect power.

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Display Likely Failure Condition Recommended Repair Procedure F10 Display error 1. Unplug microwave oven or disconnect power. 2. Check that the ribbon cables between the display electronic control and

the electronic control at P11 and P21 are securely connected. 3. Plug in microwave oven or reconnect power. 4. If problem persists, unplug microwave oven or disconnect power 5. Replace electronic control. 6. Plug in microwave oven or reconnect power.

NOTE: If lights work, but cooling fan does not, 40W inverter might have failed. See “Checking Inverters.”

Component Tests

IMPORTANT:

s Unplug microwave oven or disconnect power. s Conduct a microwave energy test after performing any tests or repairs to the microwave oven. s Remove the lead wires from the related component before conducting any of the following tests. s Check that all wire leads are in the correct positions before operating the microwave oven. s Discharge the high-voltage capacitor and remove the lead wires from the primary winding of the high-voltage s Grasp wire connectors when removing the wire leads transformer before conducting any of the following from microwave oven parts. tests. s All testing must be done with an ohmmeter having a s All operational checks using microwave energy must be sensitivity of 20,000 ohms per volt DC or greater, and done with the microwave oven loaded with a minimum powered by at least a 9-volt battery. of 8 oz (250 mL) of water in a microwave safe container.

Components Test/Results Magnetron 1. Unplug microwave oven or disconnect power. Antenna 2. Remove wire leads. Check that the seal is in good condition. Gasket 3. Measure resistance (ohmmeter scale: Rx1):

Filament s Filament terminal: Normal: Less than 1 ohm DC Cooling Fan Motor 4. Measure resistance (ohmmeter scale: Rx1k):

R s Filament to chassis: Normal: Infinite BK 1. Unplug microwave oven or disconnect power. Turntable Motor/ 2. Remove wire leads. Stirrer Motor 3. Using an external 9 or 12 DC voltage source, connect to fan wires: red (R) wire to “+”

and black (BK) wire to “-.” s Fan should work. 4. If it does not work, unplug the 9 or 12 DC voltage source. 5. Replace fan.

1. Unplug microwave oven or disconnect power. 2. Remove wire leads. 3. Measure resistance (ohmmeter scale: Rx1k):

s Turntable Motor: Normal: 2.7k-3.8k ohms (approximate); Abnormal: Infinite s Stirrer Motor: Normal: 3.3k-4.2k ohms (approximate); Abnormal: Infinite

Hood Exhaust Fan Motor 1. Unplug microwave oven or disconnect power. BK 2 BK 3 2. Remove wire leads.

3. Measure resistance (ohmmeter scale: Rx1): s Normal: Black 1 (BK 1)—Black 2 (BK 2): 30-60 ohms (approximate); Black 1 (BK 1)—Black 3 (BK 3): 40-80 ohms (approximate) s Abnormal: Infinite

BK 1

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Components Test/Results

Humidity Sensor 1. Unplug microwave oven or disconnect power.

W 2. Remove the 3-pin connector from electronic control (P3). R BK NOTE: Do not remove the attached resistor, which is used for internal resistance calibration. Resistor 3. Measure resistance across pins 1 and 3, and across pins 2 and 3 (ohmmeter scale: Rx1k): s Normal: 2.8k ohms (approximate) at 77º +/- 18ºF (25º +/- 10ºC) s Abnormal: Infinite

Thermostats NOTE: Refer to “Parts Layout” for opening and closing temperatures.

Cavity 1. Unplug microwave oven or disconnect power. Thermostat 2. Remove wire leads.

Magnetron 3. Measure continuity (ohmmeter scale: Rx1): Thermostat s Cavity, Magnetron and Grill Thermostats: Normal: Continuity; Abnormal: Infinite Grill s Exhaust Fan Thermostat: Normal: Infinite; Abnormal: Continuity Thermostat

Exhaust Fan Thermostat

AC Line Filter 1. Unplug microwave oven or disconnect power.

P34 P33 2. Remove wire leads.

P31 3. Measure resistance (ohmmeter scale: Rx10k): s P31 and P32, P33 and P34: Normal: Greater than or equal to 300k ohms; Abnormal: Less than 100k ohms s P31 and P34, P32 and P33: Normal: 0 ohms; Abnormal: Greater than 100k ohms

P32

Halogen Grill Element 1. Unplug microwave oven or disconnect power. 1000W, 120V (inside cavity) 2. Remove wire leads.

3. Measure continuity (ohmmeter scale: Rx1): s Normal: 1.5k ohms (approximate) s Abnormal: Infinite

Start Quartz Tube 1. Unplug microwave oven or disconnect power. 600W, 60V (not visible to user) 2. Remove wire leads.

3. Measure resistance (ohmmeter scale: Rx1): s Normal: 6 ohms (approximate) s Abnormal: Infinite

Quartz Heater 1. Unplug microwave oven or disconnect power. 500W, 120V (inside cavity) 2. Remove wire leads.

3. Measure resistance (ohmmeter scale: Rx1): s Normal: 27 ohms (approximate) s Abnormal: Infinite

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Checking Inverters

Measure Oven Input Current If more than 0.5A: The 1100W inverter is probably OK. Check the magnetron. 15A See Magnetron test in “Component Tests.”

Amps If less than 0.5A: There is no input to the 1100W inverter. Connect an ammeter (Valhalla Scientific 2101 or equivalent Check the following: recommended) to measure the input current of microwave 1. Unplug microwave oven or disconnect power. oven when the power level is set to Level 10 at the touch 2. No AC voltage supply. Check electronic control and panel. wiring. Check the 1100W Inverter 3. No control signal. Check electronic control and wiring.

A B NOTE: Do not try to repair the inverter board, nor try to make any adjustments to the board. H C Check wiring to 1100W inverter: 1. Unplug microwave oven or disconnect power. 2. Visually inspect 4 connectors on the 1100W inverter

board, CN701, CN702, CN703, E701, to see whether there are signs of overheating or any signs of failure due to loose wires, bad crimping, etc.

G D

F E

A. CN702 E. CN703 B. Heat sink F. Control signal in/out C. E701 G. CN701 D. High-voltage output H. 120V AC

to magnetron

Check the 40W Inverter

B CD NOTE: Do not try to repair the inverter board, nor try to make any adjustments to the board. A E Check wiring to 40W inverter: F 1. Unplug microwave oven or disconnect power. 2. Visually inspect 4 connectors on the 40W inverter board,

CN1, CN151, CN152, CN153, to see whether there are signs of overheating or any signs of failure due to loose wires, bad crimping, etc.

G

I H

A. 120V main input F. 12V halogen lamps and B. CN1 cavity lamps output C. CN152 D. CN151 G. 12V cooling fan output E. Control signal input H. CN153 I. Heat sink

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8205619 / 4619-651-97954 12/05 FOR SERVICE TECHNICIAN’S USE ONLY