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
Display Likely Failure Recommended Repair Procedure PRIMARY, SECONDARY, AND MONITOR INTERLOCK SWITCH CHECKOUT PROCEDURES ACU PCBA PIN VOLTAGE MATRIX Condition DANGER WARNING 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. Check for proper voltage by completing the following steps: 3. Plug in microwave oven or reconnect power, and con rm F4E1 Cavity 1. Enter the Diagnostics mode (press CANCEL – 5. Replace all parts and panels before operating. voltage reading. temperature CANCEL – START), and then press CONVECT to 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. F4E4 sensor failure display the cavity temperature sensor reading. 6. Plug in microwave oven or reconnect power. 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. 4. Unplug microwave oven or disconnect power. F4E9 Verify the sensor temperature reading is at 2. Connect voltage measurement equipment to the terminals listed room temperature (typically 50ºF to 90ºF [10ºC 7. Enter the Diagnostics mode (press CANCEL – (+) Continuity (-) No Continuity below. (P1-3 and P2-3 are neutral.) F8E5 to 32ºC]) and verify failure code. If failure code CANCEL – START), and then press CONVECT matches complaint, continue to Step 2. to display the cavity temperature sensor reading. NOTE: Interlock, Moniter switches and Door interlock switch cannot be adjusted and all these switches should be replaced if any of them is found to be NOTE: For 50V and over, the tolerance is +/-15V. For 0V, the tolerance is +/-3V. FCE1 Verify the sensor temperature reading. If the defective. After replacing interlock/monitor switches, reconnect wires to switch and check for continuity. FCE2 2. Unplug microwave oven or disconnect power. reading is correct, stop. Abbreviations CL – Cavity Light FCE3 NOTE: These diagrams are not intended to show a complete circuit; they represent the position of switches during “DOOR OPEN” or “DOOR FCE7 3. Disconnect sensor from ACU. 8. If the reading is still not correct, unplug microwave CLOSED” (continuity checks only). HL – Hood Light N – Neutral FC – Forced Convection HF – Hood Fan L – Line Voltage TT – Turntable Motor NFS – Neutral for Switch oven or disconnect power. Electrical Shock Hazard Electrical Shock Hazard 4. Measure sensor resistance between connector Switch Check By Door Open Door Closed NOTE: When checking voltage readings on ACU PCBA, connect the grounding test lead of voltmeter to ACU PCBA neutral wire. Use the positive pins and con rm reading is between 9.7k and 9. Replace ACU. test lead to probe connectors designated below. Only authorized technicians should Disconnect power before servicing. 10.3k at room temperature. If measurement is perform diagnostic voltage measurements. not correct, or if a short or open circuit is found, 10. Replace all parts and panels before operating. Primary 1. Unplug microwave oven or disconnect power. – + MW Oven Plugged In—Sitting Idle—ACV Readings MW Oven Running— Replace all parts and panels before replace sensor. Interlock 2. Disconnect the wires at the Primary Interlock Switch. ACV Readings After performing voltage measurements, operating. 11. Plug in microwave oven or reconnect power. disconnect power before servicing. 3. Check from the common terminal (black/brown wires) to the normally open terminal (black/white wires). Failure to do so can result in death or Failure to follow these instructions can electrical shock. 4. Reconnect wires to switch. result in death or electrical shock. Humidity sensor 1. Enter the Diagnostics mode (press CANCEL – 6. Enter the Diagnostics mode (press CANCEL – Monitor 1. Unplug microwave oven or disconnect power. + – error CANCEL – START), and then press COOK to CANCEL – START), and then press COOK to see Interlock 2. Disconnect the wires at the Monitor Interlock Switch. display the humidity sensor reading. If display if failure code reappears. does not show “8891,” continue to Step 2. 3. Check from the common terminal (white/red wires) to the normally closed terminal (blue/white wires). NOTE: There may be a delay (approximately Voltage Measurement Safety Information 2. Unplug microwave oven or disconnect power. 1 minute, 20 seconds) before the failure code 4. Reconnect wires to switch. Power On, Door is displayed. Closed When performing live voltage measurements, you must do the following: 3. Connect a new humidity sensor to the ACU P6 Secondary 1. Unplug microwave oven or disconnect power. – + Power On, Door Hood Light—High, Hood Light—Low, Verify the controls are in the off position so that the appliance does not start when energized. connector. 7. If the failure code reappears, unplug microwave Interlock 2. Disconnect the wires at the Secondary Interlock Switch. Open Door Open Door Open Allow enough space to perform the voltage measurements without obstructions. oven or disconnect power. Hood Fan Motor— Hood Light—Low MW Oven Start Keep other people a safe distance away from the appliance to prevent potential injury. 4. Replace all parts and panels before operating. 3. Check from the common terminal (white/blue wires) to the normally open terminal (blue/blue wires). Wire Color High Always use the proper testing equipment. 8. Replace ACU. Hood Fan Motor— After voltage measurements, always disconnect power before servicing. 5. Plug in microwave oven or reconnect power. High, Door Open 9. Replace all parts and panels before operating. Hood Fan Motor— 4. Reconnect wires to switch. Pin Name Med-High 10. Plug in microwave oven or reconnect power. Hood Fan Motor— Med-High, Door AccuPop error 1. Enter the Diagnostics mode (press CANCEL – 7. Plug in microwave oven or reconnect power. Door 1. Unplug microwave oven or disconnect power. + – Open CANCEL – START), and then press ACCUPOP. 8. If failure code reappears, unplug microwave Interlock 2. Disconnect the wires at the Door Interlock Switch. Hood Fan Motor— 3. Check from the common terminal (blue wire) to the normally closed terminal (orange wire). Medium 2. Knock on the microwave oven door no fewer oven or disconnect power. 4. Reconnect wires to switch. Hood Fan Motor— than 12 times within 5 seconds to check if the 9. Replace AccuPop ACU. Medium, Door Open counter display operates properly. 10. Replace all parts and panels before operating. Hood Fan Motor— 11. Plug in microwave oven or reconnect power. Low 3. If the counter does not operate properly, unplug 12. If failure code reappears, unplug microwave Hood Fan Motor— microwave oven or disconnect power. Low, Door Open oven or disconnect power. Hood Light—High 4. Check to see if the sound channel is blocked or 13. Replace ACU. the tube is loosened. 14. 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 15. Plug in microwave oven or reconnect power. PRECAUTIONS TO BE OBSERVED BEFORE 5. If the sound channel and tube are not blocked, P1-3 (N) White 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 connect a new AccuPop cable to the ACU. Door Closed Door Open P2-1 (NFS) White 0 120 0 120 0 120 0 120 0 120 0 120 0 120 6.3 6. Replace all parts and panels before operating. AND DURING SERVICING TO AVOID POSSIBLE L (NC) (NO) N (NC) L (NC) (NO) N (NC) P2-2 (Door) Orange 0 120 0 120 0 120 0 120 0 120 0 120 0 120 50 (NO) (NC) P5-4 (NO) P5-2 (NO) (NC) (NO) P5-2 Primary Interlock Monitor Secondary P5-4 Switch Interlock EXPOSURE TO EXCESSIVE MICROWAVE ENERGY Switch Interlock Primary Monitor Secondary P2-3 (N) Green/Blue 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 Interlock Interlock Interlock Switch Switch Switch Switch
a. Do not operate or allow the oven to be operated with the d. Any defective or misadjusted components in the interlock, monitor, (NO) (NC) P 2-2 (NO) (NC) P4-1 (FC-V) Blue 0 120 0 120 0 120 0 120 0 120 0 120 0 120 0 door open. door seal, and microwave generation and transmission systems P 2-2 shall be repaired, replaced, or adjusted by procedures described Door P4-2 (TT) Red 0 0 0 0 0 0 0 0 0 0 0 0 0 0 120 b. Make the following safety checks on all ovens to be serviced in service manual before the oven is released to the owner. Interlock Door before activating the magnetron or other microwave source, Exhaust air 1. Enter the Diagnostics mode (press CANCEL – 5. Replace all parts and panels before operating. Switch Interlock P4-3 (CL) Green 0 120 0 120 0 120 0 120 0 120 0 120 0 120 120 and make repairs as necessary: e. A microwave leakage check to verify compliance with the Federal Switch Performance Standard should be performed on each oven prior to template detector CANCEL – START), and then press WARM HOLD 6. Plug in microwave oven or reconnect power. 1. Interlock Operation release to the owner. failure to display the HF NTC thermistor reading. Verify the temperature reading is at room temperature 7. Enter the Diagnostics mode (press CANCEL – P4-4 (HL) Yellow 0 0 0 0 0 0 0 0 0 0 120 120 68 68 0 2. Proper Door Closing f. Do not attempt to operate the oven if the door glass is broken. NOT HEATING TROUBLESHOOTING INSTRUCTION (typically 50ºF to 90ºF [10ºC to 32ºC]) and verify CANCEL – START), and then press WARM HOLD P4-5 (HF) Black 0 0 120 120 88 88 78 78 64 64 0 0 0 0 0 3. Seal and Sealing Surfaces (Arcing, Wear and Other Damage) failure code. If failure code matches complaint, to display the HF NTC thermistor reading. Verify IMPORTANT: High voltage is present at the magnetron and high-voltage capacitor terminals. Avoid direct contact when power is connected to 4. Damage to or Loosening of Hinges and Latches these components to avoid serious injury or possible death. Always be sure that the high-voltage capacitor is discharged before accessing any continue to Step 2. the temperature reading. If it is still not correct, of these components. P4-6 (HF-R) Gray 0 0 120 120 89 89 78 78 83 83 0 0 0 0 0
2. Unplug microwave oven or disconnect power. replace ACU.
5. Evidence of Dropping or Abuse 3. Disconnect HF NTC thermistor cable from ACU. 8. If failure does not appear, stop. For a no-heat condition, refer to the following step-by-step instructions:
c. Before turning on microwave power for any service test or 4. Measure resistance between connector pins and 1. Unplug microwave oven or disconnect power. 9. If the input voltage at the high-voltage transformer primary input CONNECTORS ON ACU PCBA inspection within the microwave generating compartments, con rm reading is between 9.5k and 10.5k at wires is close to the rating voltage 120 +/-15 VAC, unplug microwave check the magnetron, waveguide or transmission line, and room temperature. If measurement is not correct 2. Discharge the high-voltage capacitor. oven or disconnect power. P1 P4 P2 cavity for proper alignment, integrity and connections. or a short or open circuit is found, replace HF N 3.1 L 6 5 4 3 2 1 3 2 1 NTC thermistor. 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.
FAILURE CODE INDICATIONS Loss of 1. Unplug microwave oven or disconnect power. 5. Plug in microwave oven or reconnect power. High-voltage capacitor P6 NOTE: There are purposely empty terminals communication 2. Check for loose connection at P17 connector on Wi-Fi module and at connector P17 on control board. between each of the numbered terminals on P1 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, between Wi-Fi 3. Replace all parts and panels before operating. 6. Close door and program the microwave oven to operate for High-voltage diode P7 P12 connector. plug in microwave oven or reconnect power. module and 4. Plug in microwave oven or reconnect power. 30 seconds. 11. If the power supply components check out OK, check control 7. Press START. the connection between the magnetron and the high- P9 voltage transformer. ACU PCBA Likely Failure 8. Check the input voltage at the high-voltage transformer primary 12. If all of the components check out OK, replace the magnetron. Display Condition Recommended Repair Procedure Appliance not 1. Press CANCEL keypad for idle return. 4. Press CANCEL to return to idle status. input wires. If the voltage is not close to the rating voltage 13. Reconnect the high-voltage transformer primary windings. linked to the 120 +/-15 VAC, 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 wireless router 2. Press CONNECT to display “CONNECTED 5. Press CONNECT until the display reads “NOT Check the circuitry as follows: displayed matches complaint, see chart below for details. TO…” CONNECTED.” Measure resistance of the fuse, microswitches, and thermostats. F1E4 Microwave ACU 1. Unplug microwave oven or disconnect power. 3. Replace all parts and panels before operating. 3. Press and hold CONNECT for 15 second 6. Press SELECT until display reads “…” Replace any failed components (refer to the wiring diagram). 4. Plug in microwave oven or reconnect power. for deprovision until the display reads “NOT failure CONNECTED TO ANY NETWORK”. 7. Press 1 keypad rst, then press WPS keypad on the wireless router within 30 seconds. 2. Replace ACU. Check for loose terminals (refer to the wiring diagram). Check F2E1 Stuck key failure 1. Unplug microwave oven or disconnect power. 3. Replace all parts and panels before operating. Appliance not Check to insure that the wireless router is connected to the internet. Check to insure that Wi-Fi module is all of the terminals on the main route from the power supply 2. Replace touch panel. 4. Plug in microwave oven or reconnect power. linked to the connected to the wireless router. to the high-voltage transformer. internet
Appliance failed Same as FCE2 repair procedure. Check for loose or failed connectors on the ACU PCBA (P1, to connect to the P2, P4). If these check out OK, plug in microwave oven or wireless router reconnect power.
Check for ACU PCBA failure. Refer to “ACU PCBA Pin 3
FOR SERVICE TECHNICIAN’S USE ONLY 2 Voltage Matrix.” 4
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 Thermostats Touch Panel and ACU PCBA Test AH A A. Hood fan motor assembly R. Monitor interlock switch IMPORTANT: 1. Unplug microwave oven or NOTE: Refer to “Parts Layout” for AG B CD B. FC thermistor S. Primary interlock switch FC Thermoactuator disconnect power. FC / Magnetron/ Cavity opening and closing temperatures. The microwave hood combination is provided with a self-diagnostic routine that can be accessed through the touch keypad. AE AF E C. Cavity light T. Door glass assembly Unplug microwave oven or disconnect power. Conduct a microwave energy test after performing any tests or Power Resistor Thermostat 1. Unplug microwave oven or AD F D. Cavity light holder U. Display board repairs to the microwave oven. 2. Remove wire leads. To initiate diagnostic routine: 3. Open door. The model number will be displayed. G E. FC thermoactuator V. AccuPop PCBA Discharge the high-voltage capacitor and remove the lead wires AC Line Filter Board 3. Measure resistance: Wi-Fi Module disconnect power. AC H F. Power resistor W. Turntable motor from the primary winding of the high-voltage transformer before Check that all wire leads are in the correct positions before 2. Remove wire leads. 1. Plug in microwave oven or reconnect power and press 4. Close door. All display segments will be lit. AB G. H.V. capacitor X. Hood (cooktop) light conducting any of the following tests. operating the microwave oven. Normal: 9 +/-3 ohms 3. Measure continuity: Cancel button to Standby (“:”). AA I H. H.V. diode Y. Holder 5. Press indicated keypad for correct display readout and beep. Z J I. Magnetron thermostat— Z. AC line lter boar Remove the lead wires from the related component before Grasp wire connectors when removing the wire leads from 1. Unplug microwave oven or Normal: Continuity 2. Close door, then press CANCEL – CANCEL – START within YX K AA. Main fuse (20 amp) conducting any of the following tests. microwave oven parts. disconnect power. 3 seconds. NOTE: If the Cancel button is pressed during this diagnostic routine, W L opens at 293°F (145°C), AB. FC thermostat—opens at NOTE: Loss of communication between you will exit the Test mode. VU M closes at 230°F (110°C) All operational checks using microwave energy must be done with All testing must be done with an ohmmeter having a sensitivity 2. Remove wire leads. Wi-Fi module and control: All display segments will be lit to indicate the Test mode has N J. Magnetron 329°F (165° C), closes at 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 3. Measure resistance: been entered. In the upper left corner of the display, the condition T S R Q2 Q1P O K. H.V. transformer 257°F (125°C) water in a microwave-safe container. a 9-volt battery. Check the WIN buss connection at the of the ACU PCBA will be displayed (“GOOD”) or the most recent L. Motor capacitor AC. WIFI Normal: 1.2k +/-0.5k ohms Wi-Fi module at and the control. error code. M. Cooling fan motor AD.FC motor 1. Unplug microwave oven or N. HF NTC thermistor AE. FC ring heater Key Tables for Test Mode O. ACU and UI PCBA AF. Humidity sensor Components Test/Results Components Test/Results disconnect power. P. Hood motor control AG.Cavity thermostat—opens at H.V. Transformer 2. Remove wire leads. Q1. Secondary interlock switch 329°F (165°C), non-resettable 1. Unplug microwave oven or Turntable Motor 1. Unplug microwave oven or 3. Measure resistance: Q2. Door interlock switch AH.External antenna Filament disconnect power. disconnect power. Key Name Function Upper Row Display Buzzer Key Name Function Upper Row Display Buzzer (orange/red wires) Normal: 20 ohms/25W Timer Set/Off 2. Remove wire leads. 2. Remove wire leads. Display UI SW, UI:xx.xx.xx, Options/Clock Erase Service GOOD 1 beep Primary 3. Measure resistance: 1. Unplug microwave oven or ACU PCB SW, Convect Error Records Secondary (white 3. Measure resistance: disconnect power. and Gee Version ACU:xx.xx.xx, 1 wire – ground to Primary winding: Less than Gee:xx.xx.xx Yes 2 transformer case) 0.5 ohm (approximate) Normal: 2.4k to 3.2k ohms 2. Remove wire leads. 3 (approximate) 3. Measure resistance: (alternating) If no error history: Magnetron Secondary winding: 120 4 GOOD ohms (approximate) 1. Unplug microwave oven or Normal: L-IN to L-OUT Error History 1 beep H.V. Capacitor FC Motor disconnect power. (coil): Less than 1 ohm; N-IN 5 Check If error history: FxEx Filament winding: 0 ohms to N-OUT (coil): Less than 6 FxEx… Motor Capacitor 2. Remove wire leads. 1 ohm – key 30 1 beep 7 POWER OUTPUT MEASUREMENT Primary winding to 3. Measure resistance: 8 Cooling Fan Motor grounding: Normal: In nite 9 Cavity Sensor 0000-0250 1 beep The power output of the magnetron can be measured using the Measure Voltage 0 Check following “Voltage Measurement at Power Source” and “Output Test.” H.V. Diode Filament winding to grounding: Normal: In nite – key 28 1 beep Cavity Light ON Cavity Lamp 1 beep Before you perform the test: Normal: 23 to 25 ohms SCHEMATIC DIAGRAM 1. Unplug microwave oven or Cavity Light and Light and Turntable 1 beep Make sure that the oven cavity is cool and clean. disconnect power. Humidity Sensor 1. Unplug microwave oven or To avoid damage to the microwave, do not use LED style light Secondary Magnetron Turntable ON disconnect power. bulbs. Only use incandescent light bulbs. Interlock Reheat – key 08 1 beep 2. Remove wire leads. WH Switch Thermostat AccuPop Check the line voltage at the wall outlet while microwave oven 3. Measure resistance: RD 2. Remove the 3-pin connector Defrost AccuPop Testing, TT, CL, MW is operating. See “Voltage Measurement at Power Source.” BK from the electronic control (P6). 2 4 BU WH BU W High Voltage Potato or Filament terminal: Normal: Components Baked Potato – AccuPop Pass or 1 beep Relays 4913 and MW Turbo On 1 beep Less than 1 ohm Resistor NOTE: Do not remove the L Cavitvy BU Soften/Melt 4903 (1100W) ON attached resistor which is Thermostat Vegetable Filament to chassis: Normal: used for internal resistance Steam/Simmer AccuPop Fail* for 10 seconds Tools Needed In nite calibration. AC 120V/125V 60Hz WH P5-4 BU P6-3 BU Motor BU WH Red Tube Magnetron Warm Hold POWER CORD YL YL Capacitor Black Tube Cook or 2-cup measuring cup A 1. Unplug microwave oven or 3. Measure resistance across pins LN White RD RD P5-2 FA Auto Cook – key 05 1 beep Thermometer B disconnect power. 1 and 3 and across pins 2 and 3: Cy WH Tab BU F Cook Time/ FC Relay 4904, Voltmeter/ohmmeter R Cx P6-5 CF Power FC Motor Relay 2. Remove wire leads. HL White Monitor TT Black Tube Kids Menu – key 14 1 beep 4914, TT Relay 3. Measure resistance: Cy YL/GN Tab Interlock 4902, and Golden Switch P5-1 Turntable Cavity Light Terminal to terminal: Tab RD Relay 4901 ON Force Convect 1 beep C Normal: Momentarily G HF CL Select Choice indicates several ohms and WH – key 09 1 beep then gradually returns to Normal: 2.8k ohms RD WH Golden BK – key 06 1 beep in nite. (approximate) at 77ºF (28ºC) BK Tab BK H.V. – key 12 1 beep +/-18ºF (-10ºC) WH Capacitor NTC Ambient Terminal to case: Normal: P6-1 W Temperature 0000-0120 1 beep In nite Hood Exhaust Fan Motor 1. Unplug microwave oven or Check Voltage Measurement at Power Source BK HF TP WH P5-5 Humidity Sensor 1. Unplug microwave oven or disconnect power. Check Standby Power disconnect power. Thermostat Mode Check 12:33 1 beep 2. Remove wire leads. WH H.V. Failure History 2. Remove wire leads. Fuse L BU P1-1 BR Primary Check 1. Fill the measuring cup with 2 cups (500 mL) of tap water. 3. Measure motor capacitor: 3. Measure resistance: 20AMP BK Power P4-3 GNInterlock H.V. Diode P2-2 OR BUSwitch – Hood Light Relay 2. Place in the center of the microwave oven cavity. Normal: Momentarily 0 1 3 P4-1 R P4-6 GY resistor GY Door RD Transformer 4910 ON ohms, then goes to in nite P2-2Interlock Hood Light High 1 beep 3. Operate the microwave oven on high power for 1 minute. AC LINE FILTER FC TH FCM P1-3 WH P4-4 YL P4-5 BK P2-3Switch 1. Unplug microwave oven or P2-3 GN 4. While the microwave oven is operating, measure the line voltage disconnect power. R P2-1 WH at the power source. See “Measure Voltage” illustration. P4-2 RD Hood Light Relay A. House power supply wall outlet 2. Remove wire leads. BU FC 4909 ON 5. Verify the voltage is constant during microwave oven operation. B. Voltmeter/ohmmeter test leads 3. Measure resistance: BK thermostat If voltage drops below 108V, contact a quali ed electrician to check C. Microwave oven plug FC WH heater 7000-9999 1 beep Hood Light Low 1 beep your electrical supply. Normal: 40 to 60 ohms High Speed—Normal: Red FC-V N HL LR HF CL DOOR N N NFS TTM (approximate) (RD) and Blue (BU) wires: 70 6. Make note of the voltage while the microwave oven is running to 100 ohms (approximate); CL Relay TT Relay 100K 68K P6 and proceed to the output test. NOTE: Some inexpensive meters Blue (BU) and Black (BK) 4901 4902 47K HUM may indicate in nite resistance in wires: 30 to 60 ohms YL/GN MW Relay 4903 No Nc Sensor both directions. (approximate) SMPS Vent Fan Relay 1. Unplug microwave oven or FC Motor 2 1 P9 H 4911 ON Relay 4914 Fuse Hood If no error history: (High Speed) disconnect power. Diode 6908 HF Relay Thermistor GOOD 2. Measure resistance: HL Relay 4911 If error history: FxEx Hood Fan HIGH 1 beep 4909 BU YY FxEx YY… Forward: Normal: Continuity TRIAC RD 1 beep HL Relay 7915 MW TURBO key 10 1 beep Reverse: Normal: In nite (Rev. A) 4910 Relay 4913 SYMBOL NOTES: Vent Fan ON 7 BK FC Relay PCBA Relay 4911 OFF 4904 (Low Speed) Hood Fan LOW 1 beep Low Speed—Normal: Red (RD) and Blue (BU) wires: 70 Output Test to 100 ohms (approximate); P13 P11 P12 Blue (BU) and White (WH) – key 45 1 beep TT, CL, MW Relay 1 beep 1. Fill the measuring cup with 2 cups (500 mL) of 70ºF (21ºC) tap water. wires: 50 to 80 ohms P6-1 Popcorn PCBA FC Sensor 4903 (1000W) ON Microwave On 2. Stir the water with the thermometer to ensure uniform temperature. (approximate) or Accupop PCBA for 10 seconds 8. Using the following chart, determine if the output of the microwave CONNECTOR P14 P15 P16 Add warm or cool water to bring the water to the correct oven is within the range listed based on the line voltage and wattage Wi-Fi Module Antenna – WPR4xxxxxxxxx 1 beep temperature. rating of the microwave oven. UI 88:E7:12:xx:xx:xx 3. Place the measuring cup in the center of the microwave oven cavity. P17 Exit Test Mode Timer 1 beep 4. Operate the microwave oven on high power for 1 minute. 5. Remove the measuring cup and stir the water with the thermometer HF NTC Thermistor 1. If “NTC SHORT, CALL FOR for about 20 seconds. Water Temperature for Line Voltage and Wattage Rating SERVICE” or “NTC OPEN, – key 46 1 beep 6. Record the temperature of the water. CALL FOR SERVICE” scrolls on App control 7. Refer to the model serial tag on the microwave oven to acquire display, unplug microwave oven Remote Enable enable Connect Router 1 beep wattage output rating of the microwave oven. Voltage 700W 1000W 1200W P5 or disconnect power. Connect Wi-Fi Conn Check 1 beep 3551 Model Number Wi-Fi connection 1 beep 120V 96ºF to 102ºF 110ºF to 116ºF 124ºF to 130ºF 2. Measure resistance: – Serial Number 1 beep enable/disable (36ºC to 39ºC) (43ºC to 47ºC) (51ºC to 54ºC)
108V 91ºF to 97ºF 101ºF to 107ºF 111ºF to 117ºF Normal: 10k ohms +/-5% at (33ºC to 36ºC) (38ºC to 42ºC) (44ºC to 47ºC) 77ºF (25ºC) Turn on the touch Key 55 panel back light FC Thermistor 1. Unplug microwave oven or disconnect power. W11175367A * Knock on microwave oven door 12-24 times, and then the result (Pass or Fail) will be displayed. NOTE: This sheet contains important Technical Service Data. 2. Remove wire leads. FOR SERVICE TECHNICIAN ONLY 3. Measure resistance: DO NOT REMOVE OR DESTROY
Normal: 17k +/-20% ohm W11175367A 11/17 at 77ºF (25ºC) ©2017 All rights reserved. FOR SERVICE TECHNICIAN’S USE ONLY