TechSheet-W11175376-REVA
Tech Sheet FOR SERVICE TECHNICIAN’S USE ONLY FOR SERVICE TECHNICIAN’S USE ONLY FOR SERVICE TECHNICIAN’S USE ONLY FOR SERVICE TECHNICIAN’S USE ONLY Do not discard PRIMARY, SECONDARY, AND MONITOR INTERLOCK SWITCH CHECKOUT PROCEDURES FAILURE CODE INDICATIONS ACU PCBA PIN VOLTAGE MATRIX IMPORTANT: Before checking the interlock switches, unplug microwave oven or disconnect power. Be sure to disconnect all of the wires at the switch 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, being tested before making any continuity readings. Check for proper voltage by completing the following steps: plug in microwave oven or reconnect power. NOTE: The Primary Interlock Switch, Monitor Interlock Switch, and Door Interlock Switch are mounted in door lock switch cradle. All the interlock 1. Unplug microwave oven or disconnect power. 3. Plug in microwave oven or reconnect power, and con rm voltage DANGER WARNING Display Likely Failure Recommended Repair Procedure switches can be indenti ed by the wire colors that are connected to the terminals of the switches. See the chart below for wire color designation. reading. Condition 2. Connect voltage measurement equipment to the terminals listed below. (P1-3 and P2-3 are neutral.) 4. Unplug microwave oven or disconnect power.

Enter the Diagnostics mode (press CANCEL – CANCEL – START) and press COOK TIME/POWER to verify the failure code. If the failure code Switch Check By Door Open Door Closed NOTE: For 50V and over, the tolerance is +/-15V. For 0V, the tolerance is +/-3V. displayed matches complaint, see chart below for details. Primary Interlock 1. Unplug microwave oven or disconnect power. – + Abbreviations F1E4 Microwave ACU 1. Unplug microwave oven or disconnect power. 3. Replace all parts and panels before operating. 2. Disconnect the wires at the Primary Interlock Switch. + – CL – Cavity Light PCBA failure 2. Replace ACU PCBA. 4. Plug in microwave oven or reconnect power. Monitor Interlock 3. Check from the common terminal (black/brown wires) to the – + HL – Hood Light N – Neutral FC – Forced Convection HF – Hood Fan L – Line Voltage TT – Turntable Motor NFS – Neutral for Switch Secondary Interlock normally open terminal (black/white wires). F2E1 Stuck key failure 1. Unplug microwave oven or disconnect power. 3. Replace all parts and panels before operating. 4. Reconnect wires to 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 2. Replace touch panel. 4. Plug in microwave oven or reconnect power. Door Interlock lead to probe connectors designated below. Electrical Shock Hazard Electrical Shock Hazard 1. Unplug microwave oven or disconnect power. F4E1 Cavity 1. Enter the Diagnostics mode (press CANCEL – 5. Replace all parts and panels before operating. 2. Disconnect the wires at the Monitor Interlock Switch. MW Oven Running Only authorized technicians should Disconnect power before servicing. temperature CANCEL – START), and then press CONVECT to 3. Check from the common terminal (white/brown wires) to the —ACV Readings perform diagnostic voltage measurements. sensor failure display the cavity temperature sensor reading. 6. Plug in microwave oven or reconnect power. Replace all parts and panels before Verify the sensor temperature reading is at normally closed terminal (blue/white wires). After performing voltage measurements, operating. room temperature (typically 50ºF to 90ºF [10ºC 7. Enter the Diagnostics mode (press CANCEL – 4. Reconnect wires to switch. disconnect power before servicing. to 32ºC]) and verify failure code. If failure code CANCEL – START), and then press CONVECT to Failure to do so can result in death or matches complaint, continue to Step 2. display the cavity temperature sensor reading. 1. Unplug microwave oven or disconnect power. Failure to follow these instructions can electrical shock. Verify the sensor temperature reading. If the 2. Disconnect the wires at the Secondary Interlock Switch. result in death or electrical shock. 2. Unplug microwave oven or disconnect power. reading is correct, stop. 3. Check from the common terminal (white/blue wires) to the MW Oven Plugged In—Sitting Idle—ACV Readings 3. Disconnect sensor from ACU PCBA. 8. If the reading is still not correct, unplug microwave normally open terminal (blue/blue wires). Voltage Measurement Safety Information oven or disconnect power. 4. Reconnect wires to switch. Power On, Hood Fan Motor—6, Hood Light— Hood Light— 4. Measure sensor resistance between connector Door Closed Door Open High, Door Open Low, Door Open When performing live voltage measurements, you must do the following: pins and con rm reading is between 9.7k and 9. Replace ACU PCBA. 1. Unplug microwave oven or disconnect power. Power On, Hood Light—High Hood Light—Low MW Oven Start Verify the controls are in the off position so that the appliance does not start when energized. 10.3k at room temperature. If measurement is 2. Disconnect the wires at the Door Interlock Switch. Door Open Allow enough space to perform the voltage measurements without obstructions. not correct, or if a short or open circuit is found, 10. Replace all parts and panels before operating. 3. Check from the common terminal (blue wire) to the Hood Fan Motor—1 Keep other people a safe distance away from the appliance to prevent potential injury. replace sensor. Hood Fan Motor—1, Always use the proper testing equipment. 11. Plug in microwave oven or reconnect power. normally closed terminal (orange wire). Door Open After voltage measurements, always disconnect power before servicing. 4. Reconnect wires to switch. Hood Fan Motor—2 F4E4 Humidity sensor 1. Enter the Diagnostics mode (press CANCEL – 6. Enter the Diagnostics mode (press CANCEL – Pin Name Wire Color Hood Fan Motor—2, error CANCEL – START), and then press COOK to CANCEL – START), and then press COOK to Door Open display the humidity sensor reading. If display see if failure code reappears. Hood Fan Motor—3 does not show “8891,” continue to Step 2. (+) Continuity (-) No Continuity Hood Fan Motor—3, NOTE: There may be a delay (approximately Door Open 2. Unplug microwave oven or disconnect power. 1 minute, 20 seconds) before the failure code is NOTE: These diagrams are not intended to show a complete circuit; they represent the position of switches during “DOOR OPEN” or “DOOR Hood Fan Motor—4 displayed. CLOSED” (continuity checks only). Hood Fan Motor—4, 3. Connect a new humidity sensor to the ACU Door Open PCBA P6 connector. 7. If the failure code reappears, unplug microwave Hood Fan Motor—5 oven or disconnect power. Hood Fan Motor—5, 4. Replace all parts and panels before operating. Door Open 8. Replace ACU PCBA. Hood Fan Motor—6 5. Plug in microwave oven or reconnect power. 9. Replace all parts and panels before operating. P1-1 (L) Brown 120 120 120 120 120 120 120 120 120 120 120 120 120 120 120 120 120 120 120 00 10. Plug in microwave oven or reconnect power. NOTE: Interlock, Monitor switches and Door interlock switch cannot be adjusted and all these switches should be replaced if any one of P1-3 (N) White 0 120 0 0 00000 0 00 0 0 000 06 them is found to be defective. After replacing interlock/monitor switches, reconnect wires to switch and check for continuity. 0 120 00 P2-1 (NFS) White 0 120 0 120 0 120 0 120 120 120 120 120 0 120 0 120 6.3 00 Door Closed Door Open P2-2 (Door) Orange 0 120 0 120 0 120 0 120 0 120 120 120 120 120 0 120 0 120 50 0 120 L (NC) (NO) N (NC) L (NC) (NO) N (NC) 00 (NO) 00 F4E9 POPCORN error 1. Enter the Diagnostics mode (press CANCEL – 7. Plug in microwave oven or reconnect power. (NC) P5-4 (NO) P5-2 (NO) (NC) P5-4 (NO) P5-2 P2-3 (N) Brown/ 00 0 0 000000000 0 000 06 CANCEL – START), and then press POPCORN. 8. If failure code reappears, unplug microwave oven Primary Blue PRECAUTIONS TO BE OBSERVED BEFORE Interlock Monitor Secondary Primary Monitor Secondary 2. Knock on the microwave oven door no fewer or disconnect power. Switch Interlock Interlock Interlock Interlock than 12 times within 5 seconds to check if the 9. Replace POPCORN PCBA. Switch Switch Switch Switch Interlock counter display operates properly. 10. Replace all parts and panels before operating. Switch 11. Plug in microwave oven or reconnect power. AND DURING SERVICING TO AVOID POSSIBLE 3. If the counter does not operate properly, unplug 12. If failure code reappears, unplug microwave oven (NO) (NC) (NO) (NC) P4-1 (FC-V) Blue 0 0 000000000 0 000 00 microwave oven or disconnect power. P 2-2 P 2-2 or disconnect power. P4-2 (TT) Red 0 120 0 120 0 120 0 120 120 120 120 120 0 120 0 120 120 4. Check to see if the sound channel is blocked or 13. Replace ACU PCBA. Door Door EXPOSURE TO EXCESSIVE MICROWAVE ENERGY the tube is loosened. 14. Replace all parts and panels before operating. Interlock Interlock P4-3 (CF) Green 0 120 0 120 0 120 0 120 120 120 120 120 0 120 0 120 120 15. Plug in microwave oven or reconnect power. Switch Switch 5. If the sound channel and tube are not blocked, a. Do not operate or allow the oven to be operated with the d. Any defective or misadjusted components in the interlock, monitor, connect a new POPCORN cable to the ACU P4-4 (HL) Yellow 0 0 000000000 0 120 120 68 68 0 door open. door seal, and microwave generation and transmission systems PCBA. shall be repaired, replaced, or adjusted by procedures described NOT HEATING TROUBLESHOOTING INSTRUCTION P4-5 (HF) Black 120 120 85 85 80 80 74 74 67 67 61 61 0 0 0 0 0 b. Make the following safety checks on all ovens to be serviced in service manual before the oven is released to the owner. 6. Replace all parts and panels before operating. before activating the magnetron or other microwave source, IMPORTANT: High voltage is present at the magnetron and high-voltage capacitor terminals. Avoid direct contact when power is connected to P4-6 (HF-R) Gray 120 120 85 85 80 80 74 74 67 67 80 80 0 0 0 0 0 and make repairs as necessary: e. A microwave leakage check to verify compliance with the Federal these components to avoid serious injury or possible death. Always be sure that the high-voltage capacitor is discharged before accessing any Performance Standard should be performed on each oven prior to of these components. 1. Interlock Operation release to the owner. F8E5 Exhaust air 1. Enter the Diagnostics mode (press CANCEL – 5. Replace all parts and panels before operating. For a no-heat condition, refer to the following step-by-step instructions: CONNECTORS ON ACU PCBA 2. Proper Door Closing f. Do not attempt to operate the oven if the door glass is broken. template detection failure CANCEL – START), and then press WARM HOLD 1. Unplug microwave oven or disconnect power. Check for loose or failed connectors on the ACU PCBA (P1, P2, P1 P2 3. Seal and Sealing Surfaces (Arcing, Wear and Other Damage) to display the HF NTC thermistor reading. Verify 6. Plug in microwave oven or reconnect power. P4). If these check out OK, plug in microwave oven or reconnect N 3.1 L P4 3 2 1 2. Discharge the high-voltage capacitor. power. 6 5 4 3 2 1 4. Damage to or Loosening of Hinges and Latches the temperature reading is at room temperature 7. Enter the Diagnostics mode (press CANCEL – 3. Disconnect the high-voltage transformer primary windings. Check for ACU PCBA failure. Refer to “ACU PCBA Pin 5. Evidence of Dropping or Abuse (typically 50ºF to 90ºF [10ºC to 32ºC]) and verify CANCEL – START), and then press WARM HOLD Voltage Matrix.” 4. Attach the voltmeter leads to the high-voltage transformer primary c. Before turning on microwave power for any service test or failure code. If failure code matches complaint, to display the HF NTC thermistor reading. Verify input wires. inspection within the microwave generating compartments, check the magnetron, waveguide or transmission line, and continue to Step 2. the temperature reading. If it is still not correct, cavity for proper alignment, integrity and connections. 2. Unplug microwave oven or disconnect power. replace ACU PCBA. 5. Plug in microwave oven or reconnect power. P6 NOTE: There are purposely empty terminals between each of the numbered 3. Disconnect HF NTC thermistor cable from ACU 8. If failure does not reappear, stop. 6. Close door and program the microwave oven to operate for 9. If the input voltage at the high-voltage transformer primary input terminals on P1 connector. 30 seconds. wires is close to the rating voltage 120 +/-15 VAC, unplug microwave PCBA. oven or disconnect power. 7. Press START. 4. Measure resistance between connector pins and 10. Check the power supply components. Refer to “Component Tests.” P11 P12 P9 con rm reading is between 9.5k and 10.5k at 8. Check the input voltage at the high-voltage transformer primary room temperature. If measurement is not correct, input wires. If the voltage is not close to the rating voltage High-voltage transformer or if a short or open circuit is found, replace HF 120 +/-15 VAC, unplug microwave oven or disconnect power. NTC thermistor. Check the circuitry as follows: High-voltage capacitor ACU PCBA

FOR SERVICE TECHNICIAN’S USE ONLY Measure resistance of the fuse, microswitches, and thermostats. High-voltage diode Replace any failed components (refer to the wiring diagram). 11. If the power supply components check out OK, check W11175376A Check for loose terminals (refer to the wiring diagram). Check all the connection between the magnetron and the high- of the terminals on the main route from the power supply voltage transformer. to the high-voltage transformer. 12. If all of the components check out OK, replace the magnetron. 13. Reconnect the high-voltage transformer primary windings.

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FOR SERVICE TECHNICIAN’S USE ONLY FOR SERVICE TECHNICIAN’S USE ONLY FOR SERVICE TECHNICIAN’S USE ONLY FOR SERVICE TECHNICIAN’S USE ONLY

TOUCH PANEL PARTS LAYOUT (NOT TO SCALE) COMPONENT TESTS Components Test/Results Components Test/Results FC Ring Heater Touch Panel and ACU PCBA Test A A. Quartz grill heater V. POPCORN PCBA IMPORTANT: 1. Unplug microwave oven or Thermostats NOTE: Refer to “Parts Layout” for AL B. Hood fan motor assembly FC Thermoactuator disconnect power. opening and closing temperatures. AK B C. FC thermistor W. Fade in/Fade out PCBA Unplug microwave oven or disconnect power. Conduct a microwave energy test after performing any tests or Power Resistor FC / Magnetron/ Cavity 1. Unplug microwave oven or AJ C D. Cavity light repairs to the microwave oven. 2. Remove wire leads. Thermostat DE E. Cavity light holder X. Display board Discharge the high-voltage capacitor and remove the lead wires AC Line Filter Board disconnect power. The microwave hood combination is provided with a self-diagnostic routine that can be accessed through the touch keypad. AI F F. FC thermoactuator from the primary winding of the high-voltage transformer before Check that all wire leads are in the correct positions before 3. Measure resistance: 2. Remove wire leads. G G. Power resistor Y. Lens conducting any of the following tests. operating the microwave oven. 3. Measure continuity: To initiate this routine: 3. Open door. The model number will be displayed. H. H.V. capacitor Normal: 9 +/-3 ohms I. H.V. diode Z. Turntable motor Remove the lead wires from the related component before Grasp wire connectors when removing the wire leads from Halogen Grill Element Normal: Continuity 1. Plug in microwave oven or reconnect power, and press CANCEL 4. Close door. All display segments will be lit. J. Magnetron thermostat— conducting any of the following tests. microwave oven parts. 1. Unplug microwave oven or button to standby (“:”). AA. Touch foil disconnect power. 1. Unplug microwave oven or NOTE: If the CANCEL button is pressed during this diagnostic routine, opens at 293ºF (145ºC), All operational checks using microwave energy must be done with All testing must be done with an ohmmeter having a sensitivity disconnect power. 2. Close door, then press CANCEL – CANCEL – START within 3 you will exit the Test mode. closes at 221ºF (105ºC) AB. Hood (cooktop) lights 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 2. Remove wire leads. seconds. K. Magnetron water in a microwave-safe container. a 9-volt battery. 3. Measure resistance: 2. Remove wire leads. L. H.V. transformer AC. Hood (cooktop) light holders 3. Measure continuity All display segments will be lit to indicate the Test mode has been AH H M. Motor capacitor Normal: 1.2k +/-0.5k ohms entered. In the upper left corner of the display, the condition of the AG N. Cooling fan motor AD. AC line lter board 1. Unplug microwave oven or (ohmmeter scale: Rx1): ACU PCBA will be displayed (“GOOD”) or the most recent error AF I O. HF NTC thermistor Normal: 2 +/-1 ohms code. AE P. ACU PCBA AE. Main fuse (20 amp) disconnect power. J Q. Turbo fuse (20 amp) 2. Remove wire leads. 1. Unplug microwave oven or Key Tables for Test Mode AD K R. Turbo fuse holder AF. Grill thermostat—opens at Components Test/Results Components Test/Results 3. Measure resistance: Quartz Grill Heater disconnect power. L S1. Secondary interlock switch 329ºF (165ºC), closes at H.V. Transformer Key Name Function Display Buzzer Key Name Function Display Buzzer M S2. Door interlock switch 266ºF (130ºC) 1. Unplug microwave oven or Turntable Motor 1. Unplug microwave oven or Normal: 20 ohms/25W 2. Remove wire leads. N T. Monitor interlock switch Filament disconnect power. disconnect power. 3. Measure resistance: Start/Add 1 -Display UI SW, UI: xx.xx.xx Yes Turntable – key 29 1 beep O U. Primary interlock switch AG. FC thermostat—opens at (orange/red wires) 1. Unplug microwave oven or Select Choice key 27 1 beep 329ºF (165ºC), closes at 2. Remove wire leads. 2. Remove wire leads. disconnect power. Normal: 29 +/-5 ohms min ACU PCB SW, ACU: xx.xx.xx Timer Set/Off – GOOD 1 beep AC P 266ºF (130ºC) Primary 3. Measure resistance: Setup/Clock 1 beep Secondary (white 3. Measure resistance: 2. Remove wire leads. Touch SW, TH:xx.xx.xx Erase Service Error If no error AH. Halogen grill element wire – ground to Primary winding: Less than 3. Measure resistance: Convect Bake Records history: GOOD 1 beep transformer case) 0.5 ohm (approximate) EE PROM data EE:xx.xx.xx Convect Roast If error history: 1 beep AB AI. FC motor Normal: 2.4k to 3.2k ohms 1 Error History Check FxEx FxEx… 1 beep Magnetron Secondary winding: 120 (approximate) Version and Gee:xx.xx.xx 2 0000-0260 1 beep AJ. FC ring heater ohms (approximate) 3 – key 53 1 beep H.V. Capacitor 1. Unplug microwave oven or Gee version (alternating) Cavity Lamp AA Z AK. Humidity sensor Filament winding: 0 ohms FC Motor disconnect power. Normal: L-IN to L-OUT 4 – Light and 1 beep Motor Capacitor (coil): Less than 1 ohm; N-IN Light – key 30 1 beep 5 Turntable 1 beep Y AL. Cavity thermostat— Primary winding to 2. Remove wire leads. to N-OUT (coil): Less than 6 Cavity Light On MW Turbo On 1 beep opens at 329°F (165°C), Cooling Fan Motor grounding: Normal: In nite 3. Measure resistance: 1 ohm 7 1 beep non-resettable 8 Cavity Light and key 34 1 beep H.V. Diode Filament winding to SSCcHhEMemATIaCtiDcIADGiRaAgMram Vent Fan – key 28 1 beep 9 Turntable On key 35 1 beep X W V U TS1S2 R Q grounding: Normal: In nite REV DATE DESCRIPTION DESIGNER 0 Hood Light 1 beep Reheat – key 08 1 beep TT, CL, MW Relays High 1. Unplug microwave oven or Normal: 23 to 25 ohms Cancel 4913 and 4903 Hood Light 1 beep disconnect power. Popcorn – POPCORN Testing, 1 beep (1200W) On Low Humidity Sensor 1. Unplug microwave oven or POPCORN Pass or Hood Fan 2. Remove wire leads. disconnect power. POPCORN Fail* – Highest POWER OUTPUT MEASUREMENT 3. Measure resistance: WH Secondary Magnetron Hood Fan RD 2. Remove the 3-pin connector Interlock Thermostat Defrost – key 05 1 beep – Lowest Filament terminal: Normal: BK from the electronic control (P6). 1 4 BU WH Switch High-Voltage MW Less than 1 ohm BU W Components Hood Light The power output of the magnetron can be measured using the Measure Voltage Resistor NOTE: Do not remove the Relay 4910 On following “Voltage Measurement at Power Source” and “Output Test.” Filament to chassis: Normal: attached resistor which is Cavity Soften/Melt – key 09 1 beep Before you perform the test: In nite used for internal resistance L Thermostat BU RD WH Hood Light Relay calibration. 4909 On 1. Unplug microwave oven or WH YL/GN BU Motor RD Magnetron disconnect power. 3. Measure resistance across pins Cy WH Capacitor Vegetable – key 06 1 beep Vent Fan Relay 4911 1 and 3 and across pins 2 and 3: P5-4 P5-2 RD FA On (High Speed) Make sure that the oven cavity is cool and clean. 2. Remove wire leads. RD Cx YL RD 3. Measure resistance: G WH RD F Vent Fan On Relay Check the line voltage at the wall outlet while microwave oven P6-3 P6-5 BU Halogen heater Steam/Simmer – key 12 1 beep 4911 Off (Low Speed) is operating. See “Voltage Measurement at Power Source.” Terminal to terminal: Cy Monitor CF Normal: Momentarily N White Tab BU YL RD CL P20 Interlock TT TT, CL, MW Relays indicates several ohms and BK P23 2N Switch BK BR RD 4913 and 4903 then gradually returns to AC 120V/125V 60Hz Crisp/Sizzle – key 19 1 beep (1050W) On in nite. POWER CORD HL HF Fade In R Fade Out Exit Test Mode Terminal to case: Normal: L In nite PCB Normal: 2.8k ohms P24 1L 1. Unplug microwave oven or (approximate) at 77ºF (28ºC) Quartz heater WH disconnect power. +/-18ºF (-10ºC) P20 Grill Grill Heater Check Grill 1 beep Tools Needed Golden Tab WH BK WH BK 2. Remove wire leads. Hood Exhaust Fan Motor 1. Unplug microwave oven or P5-1 2-cup measuring cup A 3. Measure motor capacitor: RD P6-1 H.V. Thermometer disconnect power. BR Capacitor Keep Warm NTC Ambient 0000-0120 1 beep Voltmeter/ohmmeter B Normal: Momentarily 0 P5-5 ohms, then goes to in nite 2. Remove wire leads. Temperature Check GY BK BR FC thermostat BK H.V. 1. Unplug microwave oven or 3. Measure resistance: Grill thermostat Cook Humidity Sensor 7000-9999 1 beep disconnect power. Fuse Primary Bu Diode Check 20AMP L Interlock C 2. Remove wire leads. BK Switch H.V. 3. Measure resistance: Transformer 2 3 R Cement BU FUSE20A Normal: 40 to 60 ohms R BU R BR (approximate) AC Line Filter FC TH FCM WH YL Door BR BR BK GN Interlock WH RD Bk FC heater NOTE: Some inexpensive meters P2-1 BU P4-2 Cook Failure History If no error history: 1 beep may indicate in nite resistance in R GY Switch BR BK Time/Power Check GOOD both directions. WH Voltage Measurement at Power Source 1. Unplug microwave oven or High Speed—Normal: Red P4-1 Bu P1-3 P4-4 P1-1 P2-3 P4-6 P4-5 P4-3 OR P2-2 P2-3 If error history: (RD) and Blue (BU) wires: 70 FxEx YY FxEx YY… disconnect power. to 100 ohms (approximate); FC-V N HL L N R HF CF N NFS TTM 2. Measure resistance: Blue (BU) and Black (BK) TRIAC 1. Fill the measuring cup with 2 cups (500 mL) of tap water. wires: 30 to 60 ohms 7919 33K 100K 68K No Nc P6 Forward: Normal: Continuity (approximate) 2. Place in the center of the microwave oven cavity. 11 2 1 H HUM Reverse: Normal: In nite Sensor 3. Operate the microwave oven on high power for 1 minute. YL/GN 1 – key 45 1 beep 7 FC Motor HF relay CL Relay TT Relay SMPS MW Relay MW TURBO 4. While the microwave oven is operating, measure the line voltage DWG NO.: MU-153-T (Rev. A) Relay 4902 BU 4903 Relay 4913 at the power source. See “Measure Voltage” illustration. CONDITION: DOOR OPEN 4914 SYMBOL NOTES: 4911 Fuse 2 P9 5. Verify the voltage is constant during microwave oven operation. 4901 Hood If voltage drops below 108V, contact a quali ed electrician to check A. House power supply wall outlet FC Relay Thermistor > your electrical supply. B. Voltmeter/ohmmeter test leads Low Speed—Normal: Red TRIAC 4904 2Y 2 PCBA C. Microwave oven plug (RD) and Blue (BU) wires: 70 7915 6. Make note of the voltage while the microwave oven is running to 100 ohms (approximate); Soft start Grill Relay >- and proceed to the output test. Blue (BU) and White (WH) Relay 4905 wires: 50 to 80 ohms 4906 key 46 1 beep (approximate) BK WIRE COLOR P11 P12

P6-1 PIN NO. – 1 Popcorn PCBA FC Sensor or Accupop PCBA CONNECTOR ACU PCBA: Appliance Control Unit Printed Circuit Board Assembly * Knock on microwave oven door 12-24 times, then the result (Pass or NAME HL Hood (Cooktop) BK CL Cavity BK: Black OR: Orange P1/P2/P4/P5/P6/P9/P12: Connectors Fail) will be displayed. Light WH Light BU: Blue YL: Yellow HF NTC Thermistor 1. If “NTC SHORT, CALL FOR BU HF Hood Fan RD: Red GN: Green SERVICE” or “NTC OPEN, Motor WH: White GY: Gray CALL FOR SERVICE” scrolls on FCM Forced YL TT Turntable BR: Brown YL/GN: Yellow/Green display, unplug microwave oven Convection Motor RD Motor Output Test or disconnect power. 8. Using the following chart, determine if the output of the microwave P5 1. Fill the measuring cup with 2 cups (500 mL) of 70ºF (21ºC) tap water. oven is within the range listed based on the line voltage and wattage 3551 2. Measure resistance: 2. Stir the water with the thermometer to ensure uniform temperature. rating of the microwave oven.

Add warm or cool water to bring the water to the correct Water Temperature for Line Voltage and Wattage Rating Normal: 10k ohms +/-5% at temperature. 77ºF (25ºC) 3. Place the measuring cup in the center of the microwave oven cavity. 4. Operate the microwave oven on high power for 1 minute. Voltage 700W 1000W 1200W FC Thermistor 1. Unplug microwave oven or 5. Remove the measuring cup and stir the water with the thermometer disconnect power. for about 20 seconds. 120V 96ºF to 102ºF 110ºF to 116ºF 124ºF to 130ºF 6. Record the temperature of the water. (36ºC to 39ºC) (43ºC to 47ºC) (51ºC to 54ºC) 2. Remove wire leads. 7. Refer to the model serial tag on the microwave oven to acquire wattage output rating of the microwave oven. 3. Measure resistance:

108V 91ºF to 97ºF 101ºF to 107ºF 111ºF to 117ºF Normal: 17k +/-20% ohm (33ºC to 36ºC) (38ºC to 42ºC) (44ºC to 47ºC) at 77ºF (25ºC) W11175376A 11/17

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