TechSheet-W10847770-RevA
Tech Sheet FOR SERVICE TECHNICIAN’S USE ONLY Do not discard

DANGER WARNING

Electrical Shock Hazard Electrical Shock Hazard

Only authorized technicians should Disconnect power before servicing. perform diagnostic voltage measurements. Replace all parts and panels before After performing voltage measurements, operating. disconnect power before servicing. Failure to do so can result in death or Failure to follow these instructions can electrical shock. result in death or electrical shock.

Voltage Measurement Safety Information

When performing live voltage measurements, you must do the following: I Verify the controls are in the off position so that the appliance does not start when energized. I Allow enough space to perform the voltage measurements without obstructions. I Keep other people a safe distance away from the appliance to prevent potential injury. I Always use the proper testing equipment. I After voltage measurements, always disconnect power before servicing.

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 the d. Any defective or misadjusted components in the interlock, monitor, door open. door seal, and microwave generation and transmission systems shall be repaired, replaced, or adjusted by procedures described b. Make the following safety checks on all ovens to be serviced in service manual before the oven is released to the owner. before activating the magnetron or other microwave source, and make repairs as necessary: e. A microwave leakage check to verify compliance with the Federal Performance Standard should be performed on each oven prior to 1. Interlock Operation release to the owner.

2. Proper Door Closing f. Do not attempt to operate the oven if the door glass is broken.

3. Seal and Sealing Surfaces (Arcing, Wear 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.

W10847770A FOR SERVICE TECHNICIAN’S USE ONLY

FOR SERVICE TECHNICIAN’S USE ONLY

FAILURE CODE INDICATIONS

NOTE: Many of the problems listed in the chart below may be solved by power cycling: Unplug microwave oven or disconnect power. After 1 minute, plug in microwave oven or reconnect power.

Display Likely Failure Recommended Repair Procedure “Enter Condition clock” F1E4 Power failure After a power failure, “Enter clock” will be flashing. Press CANCEL to end this indication. The colon will appear F2E1 when in Standby mode. F4E1 Microwave ACU 1. Unplug microwave oven or disconnect power. 3. Replace all parts and panels before operating. F4E4 4. Plug in microwave oven or reconnect power. PCBA failure 2. Replace ACU PCBA. F8E5 Stuck key failure 1. Unplug microwave oven or disconnect power. 3. Replace all parts and panels before operating. 2. Replace keypad. 4. Plug in microwave oven or reconnect power.

Cavity 1. Press CANCEL – CANCEL – START, and then 5. Replace all parts and panels before operating. temperature press CONVECT ROAST to display the cavity sensor failure temperature sensor reading. Verify the sensor 6. Plug in microwave oven or reconnect power. temperature reading is at room temperature (typically 50ºF to 90ºF [10ºC to 32ºC]) and verify 7. Press CANCEL – CANCEL – START, and then press failure code. If failure code matches complaint, CONVECT ROAST to display the cavity temperature continue to Step 2. sensor reading. Verify the sensor temperature reading. If the reading is correct, stop. 2. Unplug microwave oven or disconnect power. 8. If the reading is still not correct, unplug microwave 3. Disconnect sensor from ACU PCBA. oven or disconnect power.

4. Measure sensor resistance between connector 9. Replace ACU PCBA. pins and confirm reading is between 9.7kW and 10.3kW at room temperature. If measurement is 10. Replace all parts and panels before operating. not correct, or if a short or open circuit is found, replace sensor. 11. Plug in microwave oven or reconnect power.

Humidity sensor 1. Press CANCEL – CANCEL – START, and then 4. Replace all parts and panels before operating. error press AUTO COOK to display the humidity 5. Plug in microwave oven or reconnect power. sensor reading. If display does not show “8891,” 6. If the F4E4 failure code reappears, unplug microwave continue to Step 2. oven or disconnect power. NOTE: In software, the value 3072 will be OK. 7. Replace ACU PCBA. 2. Unplug microwave oven or disconnect power. 8. Replace all parts and panels before operating. 3. Connect a new humidity sensor to the 9. Plug in microwave oven or reconnect power. ACU PCBA.

Exhaust air 1. Press CANCEL – CANCEL – START, verify 4. Measure HF NTC thermistor resistance between connector pins and confirm reading is between template detector failure code, and then press CLOCK/OPTIONS 9.5kW and 10.5kW at room temperature. If measurement is not correct or a short or open failure to display the exhaust air temperature sensor circuit is found, replace sensor.

reading. Verify the sensor temperature reading 5. Replace all parts and panels before operating.

is at room temperature (typically 50ºF to 90ºF 6. Plug in microwave oven or reconnect power.

[10ºC to 32ºC]) and verify failure code. If failure 7. If the sensor temperature reading is still not correct, replace ACU PCBA. code matches complaint, continue to Step 2. 8. If failure does not appear, stop. 2. Unplug microwave oven or disconnect power.

3. Disconnect sensor from ACU PCBA.

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PRIMARY, SECONDARY, AND MONITOR INTERLOCK SWITCH CHECKOUT PROCEDURES

IMPORTANT: Before checking the interlock switches, unplug microwave oven or disconnect power. Be sure to disconnect all of the wires at the switch being tested before making any continuity readings.

NOTE: The Secondary Interlock Switch is mounted in the door lock switch cradle independent of the Monitor Interlock Switch and Primary Interlock Switch. The Monitor Interlock Switch and the Primary Interlock Switch can be identified by the wire colors that are connected to the terminals of the switches. See the chart below for wire color designation.

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 (black/brown wires) to the normally open terminal (black/white wires).

1. Unplug microwave oven or disconnect power. + –

2. Disconnect the wires at the Primary Interlock Switch.

3. Check from the common terminal (black/brown wires) to the normally closed terminal (orange wire).

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/red wires) to the normally closed terminal (blue/white wires).

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

3. Check from the common terminal (white/blue wires) to the normally open terminal (blue/blue 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 (NO) N (NC) Door Open (NO) N (NC)

L (NC) (NC) P5-4 (NO) P5-2 L (NC) (NC) P5-4 (NO) P5-2 (NO) (NO) Monitor Secondary Monitor Secondary Primary Interlock Interlock Primary Interlock Interlock Interlock Switch Switch Interlock Switch Switch Switch Switch

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NOT HEATING TROUBLESHOOTING INSTRUCTION

IMPORTANT: High-voltage is present at the magnetron and high-voltage capacitor terminals. Avoid direct contact when power is connected to these components to avoid serious injury or possible death. Always be sure that the high-voltage capacitor is discharged before accessing any of these components.

For a no-heat condition, refer to the following step-by-step instructions:

1. Unplug microwave oven or disconnect power. 9. If the input voltage at the high-voltage transformer primary input wires is close to the rating voltage 120 +/-15 VAC, unplug microwave 2. Discharge the high-voltage capacitor. oven or disconnect power.

3. Disconnect the high-voltage transformer primary windings. 10. Check the power supply components. Refer to “Component Tests.”

4. Attach the voltmeter leads to the high-voltage transformer primary High-voltage transformer input wires.

5. Plug in microwave oven or reconnect power. High-voltage capacitor

6. Close door and program the microwave oven to operate for High-voltage diode 30 seconds. 11. If the power supply components check out OK, check

7. Press START. the connection between the magnetron and the high- voltage transformer. 8. Check the input voltage at the high-voltage transformer primary 12. If all of the components check out OK, replace the magnetron. input wires. If the voltage is not close to the rating voltage 13. Reconnect the high-voltage transformer primary windings. 120 +/-15 VAC, unplug microwave oven or disconnect power. Check the circuitry as follows:

Measure resistance of the fuse, microswitches, and thermostats. Replace any failed components (refer to the wiring diagram).

Check for loose terminals (refer to the wiring diagram). Check all of the terminals on the main route from the power supply to the high-voltage transformer.

Check for loose or failed connectors on the ACU PCBA (P1, P2, P4). If these check out OK, plug in microwave oven or reconnect power.

Check for ACU PCBA failure. Refer to “ACU PCBA Pin Voltage Matrix.”

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ACU PCBA PIN VOLTAGE MATRIX

Check for proper voltage by completing the following steps: 3. Plug in microwave oven or reconnect power, and confirm voltage reading. 1. Unplug microwave oven or disconnect power. 4. Unplug microwave oven or disconnect power. 2. Connect voltage measurement equipment to the terminals listed below. (P1-3 and P2-3 are neutral.)

NOTE: For 50V and over, the tolerance is +/-15V. For 0V, the tolerance is +/-3V.

Abbreviations CL – Cavity Light

HL – Hood Light N – Neutral FC – Forced Convection HF – Hood Fan L – Line Voltage TT – Turntable Motor NFS – Neutral for Switch

NOTE: When checking voltage readings on ACU PCBA, connect the grounding test lead of voltmeter to ACU PCBA neutral wire. Use the positive test lead to probe connectors designated below.

MW Oven Plugged In—Sitting Idle—ACV Readings MW Oven Running— ACV Readings

Pin Name Wire Color Power On, Door Hood Light—High, Hood Light—Low, Closed Door Open Door Open Power On, Door Hood Light—Low MW Oven Start Open Hood Fan Motor— High Hood Fan Motor— High, Door Open Hood Fan Motor— Med-High Hood Fan Motor— Med-High, Door Open Hood Fan Motor— Medium Hood Fan Motor— Medium, Door Open Hood Fan Motor— Low Hood Fan Motor— Low, Door Open Hood Light—High

P1-1 (L) Brown 120 120 120 120 120 120 120 120 120 120 120 120 120 120 120

P1-3 (N) White 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6

P2-1 (NFS) White 0 120 0 120 0 120 0 120 0 120 0 120 0 120 6.3

P2-2 (Door) Orange 0 120 0 120 0 120 0 120 0 120 0 120 0 120 50

P2-3 (N) Green/Blue 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6

P4-1 (FC-V) Blue 0 120 0 120 0 120 0 120 0 120 0 120 0 120 0

P4-2 (TT) Red 0 0 0 0 0 0 0 0 0 0 0 0 0 0 120

P4-3 (CL) Green 0 120 0 120 0 120 0 120 0 120 0 120 0 120 120

P4-4 (HL) Yellow 0 0 0 0 0 0 0 0 0 0 120 120 68 68 0

P4-5 (HF) Black 0 0 120 120 88 88 78 78 64 64 0 0 0 0 0

P4-6 (HF-R) Gray 0 0 120 120 89 89 78 78 83 83 0 0 0 0 0

CONNECTORS ON ACU PCBA

P1 P4 P2 N 3.1 L 6 5 4 3 2 1 3 2 1

P6 NOTE: There are purposely empty terminals between each of the numbered terminals on P1 connector.

P12 P9

ACU PCBA

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TOUCH PANEL

Touch Panel and ACU PCBA Test

To initiate diagnostic routine: 3. Open door. The model number will be displayed.

1. Plug in microwave oven or reconnect power and press 4. Close door. All display segments will be lit. Cancel button to Standby (“:”). 5. Press indicated keypad for correct display readout and beep. 2. Close door, then press CANCEL – CANCEL – START within 3 seconds. NOTE: If the Cancel button is pressed during this diagnostic routine, you All display segments will be lit to indicate the Test mode has will exit the Test mode. been entered.

Key Tables for Test Mode

Key Name Function Upper Row Display Buzzer Key Name Function Upper Row Display Buzzer Convect Roast Display UI SW, UI: xx.xx.xx, 1 beep Cavity temp Convect 1 beep Start/Add 30 Sec ACU PCBA SW, ACU: xx.xx.xx and Convect Bake sensor check Gee: xx.xx.xx and Gee version 0 FC, Cavity Light, Turntable, Clock/Options NTC sensor check 1 beep 1 Cooling Fan On FC 1 beep

Light off/high/low – key 03 1 beep 2 Microwave Oven 3 (1000W), CL, TT 4 Speed Fan off/ – key 04 1 beep 4 and CF On MW TB 1 beep on 5 6 Cavity Light and Kitchen Timer – key 05 1 beep 7 Cooling Fan On CL 1 beep on/off 8 9 Cavity Light, Keep Warm – key 06 1 beep Cancel Turntable and Cooling Fan On Turntable – key 09 1 beep CL TT 1 beep – Cook Time – key 21 1 beep key 36 1 beep – key 14 1 beep Cook Power – key 22 1 beep key 15 1 beep – Reheat – key 24 1 beep HL_HIGH 1 beep Hood (Cooktop) Defrost – key 25 1 beep Light On (High)

Soften/Melt – key 29 1 beep Hood (Cooktop) Light On (Low) Steam/Simmer – key 2D 1 beep HL_LOW 1 beep Vent Fan On Veggie – key 2E 1 beep (High Speed)

Popcorn – key 30 1 beep Vent Fan On HF_HIGH 1 beep (Low Speed) Baked Potato – key 31 1 beep HF_LOW 1 beep Exit Test Mode Snack Menu – key 38 1 beep : or xx.xx (display at 7 segment) Kids Menu – key 37 1 beep 1 beep

Auto Cook Humidity sensor Sensing 1 beep check

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FOR SERVICE TECHNICIAN’S USE ONLY

PARTS LAYOUT (NOT TO SCALE)

A. Hood fan motor assembly Q. ACU and UI PCBA R. Touch panel AE A B. FC thermistor S. Secondary interlock switch AD B C. Cavity light T. Monitor interlock switch AC CD E D. Cavity light holder U. Primary interlock switch F E. FC thermoactuator V. Turntable motor AB F. Motor capacitor W. Hood (cooktop) light G G. Power resistor X. Hood (cooktop) light holder Y. AC line filter board H. H.V. capacitor Z. Main fuse (20 amp) AA. FC thermostat— H I. H.V. diode opens at 329ºF (165ºC), J. Magnetron thermostat— closes at 257ºF (125ºC) AB. FC motor I opens at 293ºF (145ºC), AC.FC ring heater closes at 230ºF (110ºC) AD.Humidity sensor AE. Cavity thermostat—opens at AA K. Magnetron 329ºF (165ºC), non-resettable

L. H.V. transformer

J M. Turbo fuse holder

Z K N. Turbo fuse (20 amp) O. Cooling fan motor Y L P. HF NTC thermistor X M N

W O V P U TS Q R

POWER OUTPUT MEASUREMENT

The power output of the magnetron can be measured using the Measure Voltage following “Voltage Measurement” and “Output Test.”

Before you perform the test:

Make sure that the oven cavity is cool and clean.

Check the line voltage at the wall outlet while microwave oven is operating. See “Voltage Measurement at Power Source.”

Tools Needed A B

2-cup measuring cup C Thermometer Voltmeter/ohmmeter

Voltage Measurement at Power Source

1. Fill the measuring cup with 2 cups (500 mL) of tap water. A. House power supply wall outlet B. Voltmeter/ohmmeter test leads 2. Place in the center of the microwave oven cavity. C. Microwave oven plug

3. Operate the microwave oven on high power for 1 minute.

4. While the microwave oven is operating, measure the line voltage at the power source. See “Measure Voltage” illustration.

5. Verify the voltage is constant during microwave oven operation. If voltage drops below 108V, contact a qualified electrician to check your electrical supply.

6. Make note of the voltage while the microwave oven is running, and proceed to the output test.

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FOR SERVICE TECHNICIAN’S USE ONLY

Output Test 8. Using the following chart, determine if the output of the microwave oven is within the range listed based on the line voltage and wattage 1. Fill the measuring cup with 2 cups (500 mL) of 70ºF (21ºC) tap water. rating of the microwave oven. 2. Stir the water with the thermometer to ensure uniform temperature. Water Temperature for Line Voltage and Wattage Rating Add warm or cool water to bring the water to the correct temperature. Voltage 700W 1000W 1200W 3. Place the measuring cup in the center of the microwave oven cavity. 4. Operate the microwave oven on high power for 1 minute. 120V 96ºF to 102ºF 110ºF to 116ºF 124ºF to 130ºF 5. Remove the measuring cup and stir the water with the thermometer (36ºC to 39ºC) (43ºC to 47ºC) (51ºC to 54ºC) for about 20 seconds. 6. Record the temperature of the water. 108V 91ºF to 97ºF 101ºF to 107ºF 111ºF to 117ºF 7. Refer to the model serial tag on the microwave oven to acquire (33ºC to 36ºC) (38ºC to 42ºC) (44ºC to 47ºC) wattage output rating of the microwave oven.

COMPONENT TESTS

IMPORTANT:

Unplug microwave oven or disconnect power. Conduct a microwave energy test after performing any tests or repairs to the microwave oven. Discharge the high-voltage capacitor and remove the lead wires from the primary winding of the high-voltage transformer before Check that all wire leads are in the correct positions before conducting any of the following tests. operating the microwave oven.

Remove the lead wires from the related component before Grasp wire connectors when removing the wire leads from conducting any of the following tests. microwave oven parts.

All operational checks using microwave energy must be done with All testing must be done with an ohmmeter having a sensitivity the microwave oven loaded with a minimum of 8 oz (250 mL) of of 20,000 ohms per volt DC or greater and powered by at least water in a microwave-safe container. a 9-volt battery.

Components Test/Results H.V. Transformer 1. Unplug microwave oven or disconnect power. Filament 2. Remove wire leads. (orange/red wires) 3. Measure resistance:

Primary Primary winding: Less than 0.5 ohm (approximate) Secondary (white Secondary winding: 120 ohms (approximate) wire – ground to Filament winding: 0 ohms transformer case) Primary winding to grounding: Normal: Infinite Filament winding to grounding: Normal: Infinite Magnetron 1. Unplug microwave oven or disconnect power. 2. Remove wire leads. H.V. Capacitor 3. Measure resistance: Filament terminal: Normal: Less than 1 ohm Filament to chassis: Normal: Infinite 1. Unplug microwave oven or disconnect power. 2. Remove wire leads. 3. Measure resistance: Terminal to terminal: Normal: Momentarily indicates several ohms and then gradually returns to infinite. Terminal to case: Normal: Infinite

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FOR SERVICE TECHNICIAN’S USE ONLY

Components Test/Results Motor Capacitor 1. Unplug microwave oven or disconnect power. Cooling Fan Motor 2. Remove wire leads. 3. Measure motor capacitor:

Normal: Momentarily 0 ohms, then goes to infinite

1. Unplug microwave oven or disconnect power. 2. Remove wire leads. 3. Measure resistance:

Normal: 40 to 60 ohms (approximate)

H.V. Diode NOTE: Some inexpensive meters may indicate infinite resistance in both directions. Turntable Motor 1. Unplug microwave oven or disconnect power. FC Motor 2. Measure resistance:

Forward: Normal: Continuity

Reverse: Normal: Infinite

1. Unplug microwave oven or disconnect power. 2. Remove wire leads. 3. Measure resistance:

Normal: 2.4k to 3.2k ohms (approximate)

1. Unplug microwave oven or disconnect power. 2. Remove wire leads. 3. Measure resistance:

Normal: 23 to 25 ohms

Humidity Sensor 1. Unplug microwave oven or disconnect power. 2. Remove the 3-pin connector from the electronic control (P6). WH RD NOTE: Do not remove the attached resistor which is used for internal resistance calibration. BK 3. Measure resistance across pins 1 and 3 and across pins 2 and 3:

Resistor Normal: 2.8k ohms (approximate) at 77ºF (28ºC) +/-18ºF (-10ºC)

Hood Exhaust Fan Motor 1. Unplug microwave oven or disconnect power.

2. Remove wire leads.

3. Measure resistance:

High Speed—Normal: Red (RD) and Blue (BU) wires: 70 to 100 ohms (approximate); Blue (BU) and Black (BK) wires: 30 to 60 ohms (approximate)

Low Speed—Normal: Red (RD) and Blue (BU) wires: 70 to 100 ohms (approximate); Blue (BU) and White (WH) wires: 50 to 80 ohms (approximate)

HF NTC Thermistor 1. If “NTC SHORT, CALL FOR SERVICE” or “NTC OPEN, CALL FOR SERVICE” scrolls on display, unplug microwave oven or disconnect power.

2. Measure resistance:

P5 Normal: 10k ohms +/-5% at 77ºF (25ºC) 3551

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Components FOR SERVICE TECHNICIAN’S USE ONLY FC Thermistor Test/Results

1. Unplug microwave oven or disconnect power. 2. Remove wire leads. 3. Measure resistance:

Normal: 230k +/-20% ohm at 77ºF (25ºC)

FC Ring Heater 1. Unplug microwave oven or disconnect power. 2. Remove wire leads. FC Thermoactuator 3. Measure resistance:

Power Resistor Normal: 9 +/-3 ohms

AC Line Filter Board 1. Unplug microwave oven or disconnect power. 2. Remove wire leads. Thermostats 3. Measure resistance:

FC / Magnetron/ Cavity Normal: 1.2k +/-0.5k ohms Thermostat 1. Unplug microwave oven or disconnect power. 2. Remove wire leads. 3. Measure resistance:

Normal: 20 ohms/25W 1. Unplug microwave oven or disconnect power. 2. Remove wire leads. 3. Measure resistance:

Normal: L-IN to L-OUT (coil): Less than 1 ohm; N-IN to N-OUT (coil): Less than 1 ohm

NOTE: Refer to “Parts Layout” for opening and closing temperatures. 1. Unplug microwave oven or disconnect power. 2. Remove wire leads. 3. Measure continuity:

Normal: Continuity

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FOR SERVICE TECHNICIAN’S USE ONLY Secondary Magnetron

Interlock Thermostat High-Voltage Switch Components 2 4 BU WH BU WH L Cavity Thermostat BU

SCHEMATIC DIAGRAM WH P5-4 BU P6-3 BU Motor BU WH Red Tube Magnetron YL YL Black Tube AC 120V/125V 60Hz RD RDCapacitor P5-2 FA POWER CORD F Cy WH P6-5 BU LN R Cx White White Monitor CF Black Tube Cy Tab Tab Interlock TT Switch 11 HL P5-1 RD G YL/GN HF CL BK Golden BK WH RD Tab WH Golden WH WH BK Tab H.V. P5-5 Capacitor P6-1

BK

Fuse P1-1 BR Primary H.V. Power Interlock 20AMP L P4-1 Switch Diode BK BU P4-6 GY Resistor GY P4-3 GN H.V. P2-2 OR 1 3 P1-3 WHRD P2-3 BU Fuse Transformer P4-4 YL P2-3 GN 20AMP AC Line Filter FC TH FCM P4-5 BK P2-1 WH RD P4-2 RD FC thermostat BU BK FC heater WH

FC-V N HL LR HF CL DOOR N N NFS TTM

68K 33K Nc P6 33K YL/GN MW Relay 4903 No HUM SensorH 2 1 HF relay P9 TRIACFC Motor 4911 CL Relay TT Relay SMPS BU MW TURBO 7919Relay 4914 4902 RD Relay 4913 Hood TRIAC 4901 Fuse Thermistor DWG NO.: MU-150-T 7915 PCBA FC Relay 4904

CONDITION: DOOR OPEN

SYMBOL NOTES: P12

BK WIRE COLOR:

P6-1 PIN NO.–1 FC Sensor CONNECTOR NAME HL Hood (Cooktop) BK CL Cavity BK: Black OR: Orange ACU PCBA: Appliance Control Unit Printed Circuit Board Assembly Light WBUHYLHF Light BU: Blue YL: Yellow Hood Fan RD: Red GN: Green P1/P2/P4/P5/P6/P9/P12: Connectors Forced RD Motor Turntable WH: White GY: Gray FCM Convection Motor TT Motor BR: Brown YL/GN: Yellow/Green

FOR SERVICE TECHNICIAN’S USE ONLY

W10847770A 12/15

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