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Download WARNING - ServiceMatters
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TECH SHEET - DO NOT DISCARD WARNING Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock. Electrostatic Discharge (ESD) Sensitive Electronics ESD problems are present everywhere. ESD may damage or weaken the electronic control assembly. The new control assembly may appear to work well after repair is finished, but failure may occur at a later date due to ESD stress. ■ ■ ■ ■ Use an anti-static wrist strap. Connect wrist strap to green ground connection point or unpainted metal in the appliance - OR - touch your finger repeatedly to a green ground connection point or unpainted metal in the appliance. Before removing the part from its package, touch the anti-static bag to a green ground connection point or unpainted metal in the appliance. Avoid touching electronic parts or terminal contacts; handle electronic control assembly by edges only. When repackaging failed electronic control assembly in anti-static bag, observe above instructions. DIAGNOSTICS Is oven in “Sabbath Mode”? If so, “SAB” will appear in digital display. Press and hold “6” key for 5 seconds to end Sabbath Mode. Disconnect power and perform the following checks: ■ ■ ■ ■ The most common cause for control failure is corrosion on connectors. Therefore, disconnecting and reconnecting wires will be necessary throughout the test procedures. Check all connections before replacing components, looking for broken or loose wires, failed terminals, or wires not pressed into connectors far enough. All tests/checks should be made with a VOM or DVM having a sensitivity of 20,000 ohms per volt DC or greater. Resistance checks must be made with power cord unplugged from outlet, and with wiring harness or connectors disconnected. PAGE 1 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 door open. b. Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source, and make repairs as necessary: 1. Interlock Operation 2. Proper Door Closing 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. d. Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation, and transmission systems shall be repaired, replaced, or adjusted by procedures described in service manual before the oven is released to the owner. e. A microwave leakage check to verify compliance with the Federal performance standard should be performed on each oven prior to release to the owner. f. Do not attempt to operate the oven if the door glass is broken. PROBLEM: Bake Temperature Needs Adjustment 1. Press BAKE pad for 5 seconds. The default temperature 0° or a previously entered offset temperature will show in the Temperature Display. n Press the BAKE pad to increase the temperature in 5° F or 3° C increments. n Press the BROIL pad to decrease the temperature in 5° F or 3° C increments. Maximum offset temperature adjustment is ±35° F or ±21° C. 2. Press the START pad to save the temperature adjustment. FOR SERVICE TECHNICIAN'S USE ONLY PART NO. 8302004 PAGE 2 TECH SHEET - DO NOT DISCARD FAILURE/ERROR DISPLAY CODES ■ Upon replacement, immediately return old electronic oven NOTES: ■ For combo ovens, the failure code is displayed on the side of ■ Always unplug microwave oven or disconnect power before touching internal parts of the oven! FAULT CODE ERROR CODE F0 E0 F1 F2 the display that corresponds to the oven with faulty part (upper oven = left side of display). RECOMMENDED REPAIR PROCEDURE Default F code – no failure Will only be displayed if user presses and holds the UPPER OFF key for 5 seconds and there is no pre-existing fault. Press CANCEL to clear display. E0, E1, & E2 Electronic control malfunction Check oven door switch. If OK replace control. E3, E4, & E5 Electronic control malfunction Replace control. E0 or E1 E0 Keypad keytail not connected Key held down too long, or key is shorted Temperature sensor opened (lower cavity) E1 Temperature sensor shorted (lower cavity) E2 Temperature sensor opened (microwave) E3 Temperature sensor shorted (microwave) E3 F3 F5 MEANING OF FAILURE CODE control using the mailing label supplied with each new control. E0 E0 F6 E1 E0 Lower cavity over temperature while cleaning Lower cavity over temperature during cooking Microwave cavity over temperature during cooking Self-clean latch will not lock E3 Self-clean latch will not unlock Oven over temperature while door open and latch lock Oven over temperature while door open and latch unlock E4 Oven over temperature while door close and latch unlock E1 E2 F8 1. Check keypad connector for firm connection. 2. Press CANCEL. If error code returns after 60 sec., replace keypad. 1. 2. 3. 4. 1. 2. 3. 4. Check lower cavity sensor connection. Measure sensor resistance (1080Ω at 70° F [21° C]. Add 2Ω per degree F). If resistance is not valid replace sensor. If sensor resistance and connections are good, then check for welded-closed relays on the control. If relay is shorted, replace control. Check microwave sensor connection. Measure sensor resistance (280kΩ at 70° F [21° C]; 1kΩ at 392° F [200° C]). If resistance is not valid replace sensor. If sensor resistance and connections are good, then check for welded-closed relays on the control. If relay is shorted, replace control. See F3, Error Code E0, above. See F3, Error Code E0, above. See F3, Error Code E2, above. 1. Check the latch assembly: Check latch arm pivot joint, arm/motor connection, plunger and hook springs. 2. Check the Latch Motor: - Check for firm electrical connections. - Disconnect the two wires from the motor and measure the resistance of the motor. The resistance should be approximately 2450Ω. If the motor is open (∞Ω) or shorted (0Ω), it should be replaced. 3. Check the Latch Switch: Disconnect it and use a continuity tester: - Door latched = switch closed, continuity should read 0Ω. - Door unlatched = switch open, continuity should read ∞Ω. 4. Check Door Open/Closed Switch: Disconnect it and use a continuity tester: - Door closed = switch closed, continuity should read 0Ω. - Door open = switch open, continuity should read ∞Ω. 5. Check power and element connections. Fahrenheit (° F) to Celsius (° C) Conversion 1. Fill a glass measuring cup with 16 oz. (453cc) of tap water. Stir the thermometer through the water until the temperature stabilizes. The default is Fahrenheit (° F). 2. Place the cup of water in the center of the oven. Operate on HIGH for 60 seconds. 1. Press the BROIL pad for 5 seconds. The temperature will be displayed in degrees Celsius indicated by the “C” in the temperature display. 3. Stir the thermometer through the water and record the maximum temperature. 2. To return the display to degrees Fahrenheit press the BROIL pad again for 5 seconds. “F” will show in the temperature display. 4. Subtract the cold water temperature from the hot water temperature. The normal result should be a 20 - 38° F (11.1 - 21.1° C) rise in temperature. Microwave Oven Power Output Test NOTE: Less than a 20° F (11.1° C) temperature rise may indicate an operating voltage of less than 110 volts or a low power output from the magnetron. Cooking time can be adjusted to compensate for either circumstance. Replace the magnetron only if the water temperature rise indicates a power output well beyond the normal result. The power output of the magnetron can be measured by the following test: (for accurate results, the line voltage must be 120 VAC and the oven cavity must be clean). PART NO. 8302004 FOR SERVICE TECHNICIAN'S USE ONLY TECH SHEET - DO NOT DISCARD PAGE 3 WIRE HARNESS SCHEMATIC NOTES: LIGHT HEATING ELEMENT AC DRIVE MOTOR SOLENOID PLUG WITH FEMALE CONNECTOR RELAY COIL ENCLOSED THERMISTOR RECEPTACLE WITH MALE CONNECTOR RELAY CONTACTS OPERATED BY DOOR T.O.D. (RESETABLE) When replacing the electronic control, be sure to attach the cavity select line to the proper terminal (see “CAVITY SIZE” table below). Dots indicate connections or splices. Circuit shown in standby/off mode with microwave oven door and lower oven door closed. THERMAL FUSE/T.O.D. (NON-RESETABLE ONE TIME) GROUND (CHASSIS) BR ELECTRONIC CONTROL N L1 DOOR SW BK 20A FUSE BK BK J1-1 15A FUSE P8-2 CAVITY T.O.D. TAN BR BK R PRIMARY BU INTERLOCK SWITCH BK TO MONITOR ELECTRONIC FILTER WP #4451934 CONTROL TRANSFORMER L1 P10-2 t° P17-8 P17-10 BU/R R P14-1 BU/R W P14-2 BU TURNTABLE MAGNETRON FAN BU SECONDARY INTERLOCK SWITCH P10-3 Y P8-3 BR TEMP SENSOR 1080 W AT 70°F/21.1°C t° W V/W W V/W BU P9-1 R P15-5 P15-1 TAN LATCH SWITCH (OPERATED BY MOTOR) TAN TAN BU FROM CONV FAN GY PRIMARY INTERLOCK SWITCH CONV - 1500W W J1-2 CONV. T.O.D. W J1-7 BK GRILL - 1200W GRILL T.O.D. R W J1-6 W R J1-3 W VT W P7-6 P5-8 GY/W W UPPER BLOWER P7-5 P5-9 DOOR LOCK MOTOR LATCH LOWER BLOWER W P7-3 P5-1 ON LATCH ASSY BR BR/W P5-3 DOOR SWITCH OR CAVITY SIZE SELECT GY MONITOR SWITCH GY BR W J1-4 Y RETURN LINE MUST BE CONNECTED TAN P8-4 P9-3 MAGNETRON 900W OUTPUT W W Y AIR VENT SOLENOID 120 VAC MICROWAVE BK BR GY 0.6A LOWER OVEN R R P10-4 Y CONVECTION TEMP SENSOR 280k W AT 70°F/21.1°C W BU W N HALOGEN MICROWAVE CAVITY LIGHT R R P8-1 GND N L2 R R MAGNETRON T.O.D. P10-1 Y P17-1 Y P17-2 TAN P17-3 TAN P17-4 VT P17-5 VT BK P17-6 N LIGHT POWER SUPPLY BK J1-5 INCANDESCENT 15W/BULB BK W BK W BK W P7-2 BU TAN CAVITY SIZE TAN Y 30" OPEN 27" BU/W Y BK W OR/W P5-6 P7-7 P5-10 CONV. FAN W/BK P7-1 R BK BAKE - 2000W R R/W P2-4 OR BROIL - 3000W OR P3-1 P3-2 OVEN SHUTDOWN THERMAL FUSE R R DLB RELAY RELAY LOGIC MICROWAVE OVEN MODES RELAY LOGIC KEY RE LAY MA S G. GR ILL CO NV CO NV MA FAN GF LIG AN HT UPP ER BLO W ER RELAY LOGIC LOWER OVEN P5-7 GN RELAY CONTACT R/W P2-3 BK W W/BK P7-8 MICRO. FULL PWR MICRO. VAR. PWR BROIL MANUAL CRISP OFF CONV. QUICK PREHEAT CONV. COOK SPEED COOK FOR SERVICE TECHNICIAN'S USE ONLY PART NO. 8302004 PAGE 4 TECH SHEET - DO NOT DISCARD STRIP CIRCUITS BROIL (NO MICROWAVE ENERGY) CLEAN (OVEN) The following individual circuits are for use in diagnosis. Before starting diagnosis, check the line voltage and for blown fuses. L1 N L2 TAN DOOR SWITCH ON LATCH ASSY BR/W BR BAKE AND PREHEAT-BAKE (OVEN) TAN P7-6 VT P7-5 GY/W W W/BK P2-4 R BK P2-3 R/W BAKE - 2000W P3-1 OVEN SHUTDOWN OR THERMAL FUSE OR BK P3-2 BU BU/W TAN Y DOOR LOCK MOTOR LATCH P5-3 P7-5 P5-6 VT UPPER BLOWER GY/W R BK P7-8 W/BK P2-4 R 20A FUSE P2-3 R BK DLB RELAY P3-2 R/W BAKE - 2000W R/W OVEN OR SHUTDOWN OR THERMAL FUSE BROIL - 3000W GY R BK PRIMARY INTERLOCK SWITCH MONITOR SWITCH BR W J1-4 TURNTABLE BK BK RELAY CONTACT MAGNETRON FAN BU BK P10-4 W P7-1 R BK CAVITY 15A T.O.D. BK FUSE TAN R J1-1 W W/BK R P10-2 DOOR SHOWN IN CLOSED POSITION W BR HALOGEN MICROWAVE CAVITY LIGHT R J1-5 LOWER BLOWER P3-1 BROIL - 3000W P10-1 W P5-10 BK RELAY CONTACT R/W Y BK W W/BK R P7-3 P7-6 TAN CAVITY SIZE SELECT LOWER BLOWER W L1 W BK P7-1 P7-8 OR TAN UPPER BLOWER LIGHT POWER SUPPLY P5-1 LATCH SWITCH (OPERATED BY MOTOR) N L2 ELECTRONIC CONTROL N L2 ELECTRONIC CONTROL ELECTRONIC CONTROL RETURN LINE MUST BE CONNECTED L1 PAGE 5 P7-6 VT P9-3 BU P9-1 R UPPER BLOWER W P7-1 R R GRILL T.O.D. GRILL - 1200W W BK J1-6 W R J1-3 DLB RELAY SPEED COOK (MICROWAVE) CONVECTION BAKE (OVEN) N L2 ELECTRONIC CONTROL L1 P7-7 OR/W P7-6 VT W FULL POWER / VARIABLE POWER (MICROWAVE) LIGHT POWER SUPPLY W CONV. FAN W UPPER BLOWER P7-5 BK P10-1 BR GY/W P7-1 W P2-4 BK P2-3 P3-1 BK P3-2 W/BK R R/W R/W OVEN OR SHUTDOWN OR THERMAL FUSE BROIL - 3000W P10-2 BK P10-4 RELAY CONTACT R R GY R BR MONITOR SWITCH W TURNTABLE DLB RELAY 20A BK FUSE BK N L2 P8-2 R R BU BK P8-1 SECONDARY INTERLOCK SWITCH MAGNETRON T.O.D. P7-6 BK P7-1 VT W W UPPER BLOWER W VT PRIMARY INTERLOCK SWITCH J1-4 HIGH VOLTAGE SYSTEM 900W OUTPUT CAVITY 15A T.O.D. BK FUSE TAN R J1-1 ELECTRONIC CONTROL P7-6 MAGNETRON FAN BU DOOR SHOWN IN CLOSED POSITION R CUSTOM BROIL (OVEN) L1 R HALOGEN MICROWAVE CAVITY LIGHT J1-5 W W/BK BAKE - 2000W R BK L1 LOWER BLOWER P7-8 N ELECTRONIC CONTROL UPPER BLOWER P7-5 BK W LOWER BLOWER P7-8 P3-1 BK GY/W P7-1 W/BK OR W W/BK OR R/W P3-2 BROIL - 3000W OVEN SHUTDOWN THERMAL FUSE RELAY CONTACT R CONVECT (MICROWAVE) MANUAL CRISP (MICROWAVE) W BK 20A FUSE BK BK 15A FUSE N L2 ELECTRONIC CONTROL OR/W P7-6 VT W CONVECTION TEMP SENSOR 280k Ω @ 70° F/21.1° C CONV. FAN W UPPER BLOWER P7-5 BK GY/W P7-1 P10-2 BK P10-4 PRIMARY INTERLOCK SWITCH BU/R t° P3-1 BK P3-2 OR OR R/W BROIL - 3000W R/W OVEN SHUTDOWN THERMAL FUSE PART NO. 8302004 MAGNETRON FAN BU P10-3 W BU/R P14-1 P14-2 GY BR GY MONITOR SWITCH W TURNTABLE J1-4 GY AIR VENT SOLENOID 120 VAC BR P8-4 CONV. T.O.D. CONV - 1500W VT P7-1 R P9-3 BU P9-1 R J1-2 W P8-3 P7-6 BK R CONV FAN Y R W RELAY CONTACT Y Y GY W/BK R R W W/BK R BK LOWER BLOWER P7-8 BK BR HALOGEN MICROWAVE CAVITY LIGHT J1-5 CAVITY T.O.D. R TAN J1-1 P7-7 P10-1 DOOR SHOWN IN CLOSED POSITION DLB RELAY CONVECTION BROIL (OVEN) L1 LIGHT POWER SUPPLY L1 R R/W N L2 ELECTRONIC CONTROL BR W J1-7 UPPER BLOWER GRILL T.O.D. BK R W GRILL - 1200W W J1-6 J1-3 W R DLB RELAY FOR SERVICE TECHNICIAN'S USE ONLY PART NO. 8302004 PAGE 6 COMPONENTS TECH SHEET - DO NOT DISCARD FRONT/TOP/REAR SERVICEABLE CAN BE TESTED AT CONTROL PANEL CHECK POINTS RESULTS Electronic Control Front — — Electronic Filter Front — — Control Transformer Front — — DBL Relay Front — — Membrane Switch Front — — Incandescent Light Light Bulb - Front Light Assy. - Rear — — Latch Switch Front P5-6 (BU/W) to P5-1 (TAN) Door Unlocked = Open Circuit Door Locked = Closed Circuit Latch Motor Front P7-3 (Y) to Neutral (W) Approx. 2450 Ω Door Switch Front P5-3 (BR/W) to P5-1 (TAN) Door Closed = Closed Circuit Door Open = Open Circuit Oven Temperature Sensor Front P5-8 (V/W) to P5-9 (V/W) 1080 Ω @ 70°F Lower Console Blowers Rear P7-5 (GY/W) to Neutral (W) 14 Ω to 18 Ω Oven Shutdown Thermal Fuse Rear P2-4 (R) or P3-1 (OR) to Red/White Wire at DLB Relay Closed Circuit Convection Fan Motor (Lower Oven) Rear P7-7 (OR/W) to Neutral (W) 18 Ω Bake Element Rear P2-4 (R) to Red/White Wire at DLBRelay 25 Ω to 30 Ω Broil Element Front P3-1 (OR) to Red/White Wire at DLBRelay 17 Ω to 20 Ω Primary Winding 40 Ω to 45 Ω Secondary Winding Less than 1 Ω Light Bulb - Front Light Assy. - Rear — — Upper Blower (M/W) Rear P7-6 (VT) to Neutral (W) 10 Ω to 15 Ω Convection Motor/Fan (M/W) Rear P10-3 (Y) to Neutral (W) 44 Ω All Other Microwave Components Rear — — Microwave Light Transformer (M/W) Halogen Light (M/W) Rear COMPONENTS LOCATIONS Electronic Control (Behind Front Panel) Tech Sheet Blower Motor Electronic Filter (mounted on Terminal Block L1 and Neutral) DBL Relay Membrane Switch 20 amp Microwave Fuse MW Light Transformer Control Transformer Grill Element Halogen Convection Convection Fan Light Assembly Fan Motor Thermal and Element Fuse Air Pressure Cavity on Back Relief Valve and Thermal Fuse Secondary Grill Interlock Switch Thermal Fuse Rectifier 15-Amp Line Fuse Turntable Motor High Voltage Capacitor Monitor Interlock Switch Primary Interlock Switch Cooling Fan Motor Magnetron Thermal Fuse Air Vent Solenoid High Voltage Transformer Magnetron Lower Blower Motor Oven Temperature Sensor (Rear Panel) Incandescent Lights (Rear Panel) Door Latch Assembly (Latch and Latch Motor) Convection Fan Motor Oven Shutdown Thermal Fuse (Rear Panel) CONTROL TRANSFORMER Low Voltage Transformer 1st Secondary 2nd Secondary Primary (P17-1) Y 3rd Secondary SEC 1 26 VAC (P17-2) Y BLK (P17-8) 120 VAC 60 Hz PRIMARY W (P17-10) (P17-3) TAN SEC 2 24 VAC (P17-4) TAN (P17-5) V SEC 3 7.5 VAC (P17-6) V PART NO. 8302004 FOR SERVICE TECHNICIAN'S USE ONLY TECH SHEET - DO NOT DISCARD PAGE 7 TESTING THE MICROWAVE OVEN COMPONENTS COMPONENT HIGH VOLTAGE TRANSFORMER MAGNETRON CAPACITOR RECTIFIER TEST PROCEDURE RESULTS 1. Remove the leads from the terminals. 2. Set the ohmmeter to Rx1 and touch the leads to the terminals. Primary Secondary Filament to Ground 3. Measure resistance (Rx100) Primary Filament 1. Remove the leads from the terminals. 2. Set the ohmmeter to Rx1 and touch the leads to the F and FA terminals. 3. Set the ohmmeter to Rx1k and measure filament to chassis. 1. Remove the leads from the terminals. 2. Set the ohmmeter to Rx1k and touch the leads to the terminals. Normal = Less than 1 Ω. Normal = Less than 1 Ω. Normal = 0 Ω. Normal = Infinity. Normal = Infinity. Normal = approximately 0 Ω. Normal = Infinity. Normal = Momentarily indicates several ohms, and gradually returns to infinity. 3. Terminal to chassis. 1. Remove the leads from the terminals. 2. Set the ohmmeter to Rx1k and measure forward resistance. Normal = Infinity. 3. Measure the reverse resistance. Normal = Infinity. Abnormal = Continuity. Normal = Continuity. Abnormal = Infinity. FAN MOTOR NOTE: Some inexpensive meters may show infinity in both directions. 1. Remove the leads from the terminals. 2. Set the ohmmeter to Rx1 and touch the leads to the terminals. TURNTABLE MOTOR 1. Remove the leads from the terminals. 2. Set the ohmmeter to Rx1 and touch the leads to the terminals. 1. Remove the leads from the terminals. 2. Set the ohmmeter to Rx1 and touch the leads to the terminals. Open Close Cavity Thermal Fuse 329° F (165° C) Grill Thermal Fuse 320° F (160° C) 284° F (140° C) Magnetron Cavity Grill and Magnetron Thermal Fuse 293° F (145° C) 257° F (125° C) Thermal Convection Fan Thermal Fuse Fuse Thermal Fuses Convection Fan Thermal Fuse 293° F (145° C) 221° F (105° C) GRILL ELEMENT 1. Remove the leads from the terminals. 2. Set the ohmmeter to Rx1 and touch the leads to the terminals. Normal = approximately 25 Ω. Abnormal = Infinity. Normal = approximately 25 Ω. Abnormal = Infinity. THERMAL FUSES Bulbs AIR VENT SOLENOID 1. Remove the lead from one terminal. 2. Set the ohmmeter to Rx1k and touch the leads to the terminals. OVEN SHUTDOWN THERMAL FUSE Normal = Continuity. Abnormal = Infinity. Normal = 14 Ω for both bulbs. Normal = 7 Ω for one bulb. Abnormal = Infinity. Normal = approximately 1650 Ω. Abnormal = Infinity. Thermal Fuse Part No. Opening Temp. °F 4452223 266°F ± 10°F Pink/Wht Stripe 4451442 248°F+18°F to 248°F – 0°F Yellow/Wht Stripe 4450934 338°F ± 11.7°F 4450334 275°F ± 11.7°F Verify that the oven shutdown thermal fuse is OK. 4450250 320°F ± 11.7°F To replace this thermal fuse, refer to chart at right for correct part number. 4450249 302°F ± 11.7°F Green/Wht Stripe 8300802 230°F+18°F to 230°F – 0°F Blue/Wht Stripe The oven shutdown thermal fuse is located at the back of the oven. It will shut down the elements if the temperature at the back of the oven exceeds component limits. FOR SERVICE TECHNICIAN'S USE ONLY Reclose Marking Temp. °F (with Black Letters) Red –31°F MAX Orange/Wht Stripe Blue PART NO. 8302004 PAGE 8 TECH SHEET - DO NOT DISCARD MANUFACTURED UNDER ONE OR MORE OF THE FOLLOWING UNITED STATES PATENTS: 4,102,322 4,364,589 4,467,184 OTHER PATENTS PENDING PART NO. 8302004 FOR SERVICE TECHNICIAN'S USE ONLY
