[pdf-embedder url=’http://appliancetechmanuals.com/wp-content/uploads/whirlpool/TechSheet-W10847771-RevA.pdf’ title=’TechSheet-W10847771-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.

W10847771A 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 Condition

Enter the Diagnostics mode (press CANCEL – CANCEL – START) and press COOK TIME/POWER to verify the failure code. If the failure code displayed matches complaint, see chart below for details.

F1E4 Microwave ACU 1. Unplug microwave oven or disconnect power. 3. Replace all parts and panels before operating. PCBA failure 2. Replace ACU PCBA. 4. Plug in microwave oven or reconnect power.

F2E1 Stuck key failure 1. Unplug microwave oven or disconnect power. 3. Replace all parts and panels before operating. 2. Replace touch panel. 4. Plug in microwave oven or reconnect power.

F4E4 Humidity sensor 1. Enter the Diagnostics mode (press CANCEL – 6. Enter the Diagnostics mode (press CANCEL – error CANCEL – START), and then press COOK to CANCEL – START), and then press COOK to see display the humidity sensor reading. If display if failure code reappears. does not show “8891,” continue to Step 2. NOTE: There may be a delay (approximately 2. Unplug microwave oven or disconnect power. 1 minute, 20 seconds) before the failure code is displayed. 3. Connect a new humidity sensor to the ACU PCBA P6 connector. 7. If the failure code reappears, unplug microwave oven or disconnect power. 4. Replace all parts and panels before operating. 8. Replace ACU PCBA. 5. Plug in microwave oven or reconnect power. 9. Replace all parts and panels before operating.

10. Plug in microwave oven or reconnect power.

F4E9 ACCUPOP error 1. Enter the Diagnostics mode (press CANCEL – 7. Plug in microwave oven or reconnect power. CANCEL – START), and then press ACCUPOP. 8. If failure code reappears, unplug microwave oven

2. Knock on the microwave oven door no fewer or disconnect power. than 12 times within 5 seconds to check if the 9. Replace ACCUPOP PCBA. counter display operates properly. 10. Replace all parts and panels before operating. 11. Plug in microwave oven or reconnect power. 3. If the counter does not operate properly, unplug 12. If failure code reappears, unplug microwave oven microwave oven or disconnect power. or disconnect power. 4. Check to see if the sound channel is blocked or 13. Replace ACU PCBA. the tube is loosened. 14. Replace all parts and panels before operating. 15. Plug in microwave oven or reconnect power. 5. If the sound channel and tube are not blocked, connect a new ACCUPOP cable to the ACU PCBA.

6. Replace all parts and panels before operating.

F8E5 Exhaust air 1. Enter the Diagnostics mode (press CANCEL – 5. Replace all parts and panels before operating. template detection failure CANCEL – START), and then press WARM HOLD 6. Plug in microwave oven or reconnect power. to display the exhaust air temperature sensor reading. Verify the sensor temperature reading is 7. Enter the Diagnostics mode (press CANCEL – CANCEL – START), and then press WARM HOLD at room temperature (typically 50ºF to 90ºF [10ºC to display the cavity temperature sensor reading. to 32ºC]) and verify failure code. If failure code Verify the sensor temperature reading. If it is still matches complaint, continue to Step 2. not correct, replace ACU PCBA. 2. Unplug microwave oven or disconnect power. 8. If failure does not reappear, stop. 3. Disconnect sensor from ACU PCBA.

4. Measure sensor resistance between connector pins and confirm reading is between 9.5kW and 10.5kW at room temperature. If measurement is not correct, or if a short or open circuit is found, replace sensor.

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FOR SERVICE TECHNICIAN’S USE ONLY

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 taking any ohm 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 Interlock 1. Unplug microwave oven or disconnect power. – + 2. Disconnect the wires at the Primary Interlock Switch. Monitor Interlock 3. Check from the common terminal (black/brown wires) to the + – Secondary Interlock 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).

1. Unplug microwave oven or disconnect power. 2. Disconnect the wires at the Monitor Interlock Switch. 3. Check from the common terminal (white wire) to the normally

closed terminal (blue/white wires).

1. Unplug microwave oven or disconnect power. 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 Door Open

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

(NO) (NC) P5-4 (NO) P5-2 (NO) (NC) P5-4 (NO) P5-2

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

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FOR SERVICE TECHNICIAN’S USE ONLY

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. Check for loose or failed connectors on the ACU PCBA (P1, P2, P4). If these check out OK, plug in microwave oven or reconnect 2. Discharge the high-voltage capacitor. power.

3. Disconnect the high-voltage transformer primary windings. Check for ACU PCBA failure. Refer to “ACU PCBA Pin Voltage Matrix.” 4. Attach the voltmeter leads to the high-voltage transformer primary input wires. 9. If the input voltage at the high-voltage transformer primary input wires is close to the rating voltage 120 +/-15 VAC, unplug microwave 5. Plug in microwave oven or reconnect power. oven or disconnect power.

6. Close door and program the microwave oven to operate for 30 10. Check the power supply components. Refer to “Component Tests.” seconds. High-voltage transformer 7. Press START. High-voltage capacitor 8. Check the input voltage at the high-voltage transformer primary input wires. If the voltage is not close to the rating voltage 120 High-voltage diode +/-15 VAC, unplug microwave oven or disconnect power. 11. If the power supply components check out OK, check the Check the circuitry as follows: connection between the magnetron and the high-voltage Measure resistance of the fuse, microswitches and thermostats. transformer. Replace any failed components. (Refer to the wiring diagram.) 12. If all of the components check out OK, replace the magnetron. 13. Reconnect the high-voltage transformer primary windings. 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.

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ACU PCBA PIN VOLTAGE MATRIX

Check for proper voltage by completing the following steps:

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

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

Abbreviations CL– Cavity Light

HL – Hood Light N – Neutral CF – Cooling Motor 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, Power On, Hood Fan Motor— High High, Door Open Hood Fan Motor— Hood Fan Motor— Hood Fan Motor— Hood Fan Motor— Hood Fan Motor— Hood Fan Motor— Hood Light—High Hood Light— Hood Light— Door Closed Door Open Hood Fan Motor— Med-High Med-High, Door Open Medium Medium, Door Open Low Low, Door Open High, Door Open Low, Door Open Hood Light—Low MW Oven Start

P1-1 (L) Brown 120 120 120 120 120 120 120 120 120 120 120 120 120 120 120 P1-3 (N) White P2-1 (NFS) White 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 P2-2 (Door) Orange P2-3 (N) Green/Blue 0 120 0 120 0 120 0 120 0 120 0 120 0 120 6.3 P4-2 (TT) Red P4-3 (CL) Green 0 120 0 120 0 120 0 120 0 120 0 120 0 120 50 P4-4 (HL) Yellow P4-5 (HF) Black 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 P4-6 (HF-R) Gray 0 0 0 0 0 0 0 0 0 0 0 0 0 0 120

0 120 0 120 0 120 0 120 0 120 0 120 0 120 120

0 0 0 0 0 0 0 0 0 0 120 120 68 68 0

0 0 120 120 88 88 78 78 64 64 0 0 0 0 0

0 0 120 120 89 89 78 78 83 83 0 0 0 0 0

CONNECTORS ON ACU PCBA

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

ACU PCBA P…6 NOTE: There are purposely empty terminals between each of the numbered terminals on P1 connector.

…… P11 .. P9

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FOR SERVICE TECHNICIAN’S USE ONLY

TOUCH PANEL

Touch Panel and ACU PCBA Test

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

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

1. Plug in microwave oven or reconnect power and press CANCEL 4. Close door. All display segments will be lit. button to Standby mode (“:”). NOTE: If the CANCEL button is pressed during this diagnostic routine, 2. Close door, then press CANCEL – CANCEL – START within 3 you will exit the Test mode. seconds.

All display segments will be lit to indicate the Test mode has been entered. In the upper left corner of the display, the condition of the ACU PCBA will be displayed (“GOOD”) or the most recent error code.

Key Tables for Test Mode

Key Name Function Display Buzzer Key Name Function Display Buzzer

Start/Add 30 Display UI SW UI:xx.xx.xx and Yes Select Choice – key 27 1 beep sec and ACU PCBA ACU:xx.xx.xx Frozen Entree key 01 1 beep SW Version and Gee:xx.xx.xx 1 beep Timer Set/Off – GOOD 1 beep Hood Light Gee Version (alternating) 1 beep Options/Clock Vent Fan 1 beep Erase Service Error Reheat – key 30 1 beep 1 Records AccuPop 2 – key 28 1 beep 3 Error History Check If no error 1 beep Defrost 1 beep history: GOOD Potato – key 08 1 beep 4 Cavity Light On 1 beep Soften/Melt 1 beep 5 If error history: 1 beep Vegetable – ACCUPOP Testing, 1 beep 6 Cavity Light and FxEx FxEx… 1 beep Steam/Simmer 1 beep 7 Turntable On Warm Hold ACCUPOP Pass or 1 beep 8 Cavity Lamp 1 beep 9 TT, CL, MW Relays Cook ACCUPOP Fail* 0 4913 & 4903 Light and 1 beep (1100W) On for Turntable Cook – key 05 1 beep Cancel 10 Seconds Time/Power MW Turbo On – key 14 – Kids Menu – key 09 –

– key 06 Hood Light Relay 4910 On – key 12 key 37 1 beep Hood Light Relay 1 beep NTC Ambient 0000-0120 4909 On key 38 1 beep 1 beep Temperature Check Vent Fan Relay 4911 Hood Light 1 beep On (High Speed) High 1 beep Humidity Sensor 7000-9999 1 beep Check Vent Fan On Relay Hood Light 4911 Off (Low Speed) Low Failure History If no error history: Check GOOD TT, CL, MW Relay Hood Fan 4903 (1000W) On HIGH If error history: for 10 Seconds FxEx YY FxEx YY… Hood Fan Exit Test Mode LOW – key 10 MW TB – key 45

> Timer 1 beep Turntable – key 29 1 beep key 46 1 beep >-

* Knock on microwave oven door 12-24 times, then the result (Pass or Fail) will be displayed.

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FOR SERVICE TECHNICIAN’S USE ONLY

PARTS LAYOUT (NOT TO SCALE)

AC AB C DE FG H A. Line fuse (20 amp) P. HF NTC thermistor AB U T S I B. AC line filter board Q. ACU PCBA J C. Hood fan motor assembly R. Secondary interlock AA R D. Cavity light Z K E. Cavity light holder switch Y L F. Magnetron S. Monitor interlock switch X G. Magnetron thermostat— T. Primary interlock switch M U. Display board W opens at 257ºF (125ºC), V. Lens V closes at 185ºF (85ºC) W. Touch Foil H. Power resistor X. Turntable motor I. H.V. capacitor Y. Hood (cooktop) light J. H.V. diode Z. Hood (cooktop) light K. Motor capacitor L. H.V. transformer holder M. Turbo fuse (20 amp) AA. ACCUPOP PCBA N. Turbo fuse holder AB. Cavity thermostat— O. Cooling fan motor opens at 257°F (125°C), non-resettable AC. Humidity sensor

N O P

Q

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FOR SERVICE TECHNICIAN’S USE ONLY

POWER OUTPUT MEASUREMENT

The power output of the magnetron can be measured using the following Output Test “Voltage Measurement at Power Source” and “Output Test.” Before you perform the test: 1. Fill the measuring cup with 2 cups (500 mL) of 70ºF (21ºC) tap water. 2. Stir the water with the thermometer to ensure uniform temperature. Make sure that the oven cavity is cool and clean. Add warm or cool water to bring the water to the correct Check the line voltage at the wall outlet while microwave oven is temperature. operating. See “Voltage Measurement at Power Source.”

Tools Needed 3. Place the measuring cup in the center of the microwave oven cavity.

2-cup measuring cup 4. Operate the microwave oven on high power for 1 minute. Thermometer Voltmeter/ohmmeter 5. Remove the measuring cup and stir the water with the thermometer for about 20 seconds. Voltage Measurement at Power Source 6. Record the temperature of the water. 1. Fill the measuring cup with 2 cups (500 mL) of tap water. 2. Place in the center of the microwave oven cavity. 7. Refer to the model serial tag on the microwave oven to acquire 3. Operate the microwave oven on high power for 1 minute. wattage output rating of the microwave oven. 4. While the microwave oven is operating, measure the line voltage at 8. Using the following chart, determine if the output of the microwave the power source. See “Measure Voltage” illustration. oven is within the range listed based on the line voltage and wattage 5. Verify the voltage is constant during microwave oven operation. If rating of the microwave oven.

voltage drops below 108V, contact a qualified electrician to check Water Temperature for Line Voltage and Wattage Rating your electrical supply. 6. Make note of the voltage while the microwave oven is running and Voltage 700W 1000W 1200W proceed to the output test. 120V 96ºF to 102ºF 110ºF to 116ºF 124ºF to 130ºF (36ºC to 39ºC) (43ºC to 47ºC) (51ºC to 54ºC)

108V 91ºF to 97ºF 101ºF to 107ºF 111ºF to 117ºF (33ºC to 36ºC) (38ºC to 42ºC) (44ºC to 47ºC)

Measure Voltage

A B

C

A. House power supply wall outlet B. Voltmeter/ohmmeter test leads C. Microwave oven plug

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FOR SERVICE TECHNICIAN’S USE ONLY

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 Check that all wire leads are in the correct positions before transformer 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 All testing must be done with an ohmmeter having a done with the microwave oven loaded with a minimum of sensitivity of 20,000 ohms per volt DC or greater, and 8 oz (250 mL) of water in a microwave-safe container. powered by at least 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 Secondary (white Primary winding: Less than 0.5 ohm (approximate) wire – ground to Secondary winding: 120 ohms (approximate) transformer case) Filament winding: 0 ohms Primary winding to grounding: Normal: Infinite Magnetron Filament winding to grounding: Normal: Infinite

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

Cooling Fan Motor 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

1. Unplug microwave oven or disconnect power. 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. 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)

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FOR SERVICE TECHNICIAN’S USE ONLY

ComponentsP5 Test/Results 3551 Humidity Sensor 1. Unplug microwave oven or disconnect power. W 2. Remove the 3-pin connector from the electronic control (P6). R BK NOTE: Do not remove the attached resistor which is used for internal resistance calibration. 3. Measure resistance across pins 1 and 3 and across pins 2 and 3: Resistor Hood Exhaust Fan Motor Normal: 2.8k ohms (approximate) at 77ºF (28ºC) +/-18ºF (-10ºC)

HF NTC Thermistor 1. Unplug microwave oven or disconnect power. 2. Remove wire leads. Power Resistor 3. Measure resistance:

AC Line Filter Board High Speed—Normal: Red (R) and Blue (BU) wires: 70 to 100 ohms (approximate); Blue (BU) and Black (BK) wires: 30 to 60 ohms (approximate)

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

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:

Normal: 10k ohms +/-5% at 77ºF (25ºC)

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

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

Normal: Continuity

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REV DATE DESCRIPTION DESIGNER

Schematic Diagram FOR SERVICE TECHNICIAN’S USE ONLY Cavity Secondary Magnetron High-Voltage SCHEMATIC DIAGRAMThermostatInterlockThermostat Components Switch 11 2 4 BU WH BU WH

L BU WH

WH BU Motor P5-2 Red Tube Magnetron Cy P5-4 Capacitor Black Tube BU GN BU BU FA RD Monitor RD F Cx YL RD Interlock Switch WH Black G WH P6-3 P6-5 TT CF Tube Cy N White Tab BU YL RD

AC 120V/125V 60Hz YL/GN HL HF White Tab BK BK POWER CORD Golden Tab WH BK CL L

RD P5-1 H.V. Capacitor P6-2 P6-1 Golden Tab

BK P5-5 GN WH

Fuse Cement R Primary Bk H.V. 20AMP L BK Interlock Diode Switch H.V. Transformer 1 3 FUSE20A

AC Line Filter WH YL BR GN BK GN OR BU GN WH RD Bk

P1-3 P4-4 P1-1 P4-6 P4-5 P4-3 P2-2 P2-3 P2-3 P2-2 P4-2 RD CL Door N N NFS N HL LR HF TTM P6 CL Relay 33K HUM 4901 68K 33K No Nc Sensor

HF relay 2 1 P9 4911 HF NTC YL/GN TRIAC TRIAC TT Relay Fuse MW Relay MW TURBO 7919 7915 4902 4903 Relay 4913 DWG NO.: MU-149-T SMPS CONDITION: DOOR OPEN PCBA SYMBOL NOTES: P11

BK WIRE COLOR ACCUPOP PCBA or P6-1 POPCORN PCBA PIN NO. – 1 Hood (Cooktop) BK Cavity BK: Black OR: Orange CONNECTOR HL Light W CL Light BU: Blue Y: Yellow NAME BU HF Hood Fan R: Red G: Green ACU PCBA: Appliance Control Unit Printed Circuit Board Assembly Cooling Y Motor TT Turntable W: White GY: Gray CL Fan Motor Motor BR: Brown R Y/G: Yellow/Green P1/P2/P/P4/P5/P6/P9/P11: Connectors

FOR SERVICE TECHNICIAN’S USE ONLY

W10847771A 1/16

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