PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY

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1 TECH SHEET - DO OT DISCAD PAGE PECAUTIOS TO E OSEVED EFOE AD DUIG SEVICIG TO AVOID POSSILE EXPOSUE TO EXCESSIVE MICOAVE EEGY 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:. Interlock Operation. Proper Door Closing 3. Seal and Sealing Surfaces (Arcing, ear & Other Damage) 4. Damage to or Loosening of Hinges & Latches 5. Evidence of Dropping or Abuse c. efore 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 window area of the door is broken. MICOAVE OVE POE OUTPUT MEASUEMET The power output of the magnetron can be measured by the following test: (for accurate results, the line voltage must be 0 VAC and the oven cavity must be clean).. Fill a glass measuring cup with 453cc (6 oz.) of tap water. Stir the thermometer through the water until the temperature stabilizes.. Place the cup of water in the center of the oven. Operate on HIGH for 60 seconds. 3. Stir the thermometer through the water and record the maximum temperature. FAILUE CODES/IDICATIOS Display Likely Failure Condition 4. Subtract the cold water temperature from the hot water temperature. The normal result should be a.-. C (0-38 F) rise in temperature. OTE: Less than a. C (0 F) temperature rise may indicate an operating voltage of less than 0 volts or a low power output from the magnetron. Cooking time can be adjusted to compensate for either circumstance. eplace the magnetron only if the water temperature rise indicates a power output well beyond the normal result. ecommended epair Procedure Flashing After a power failure, the colon : will be flashing. Press any key to end this Power failure colon : indication. The colon will then be steady when in stand-by. -F- Membrane switch failure eplace membrane switch. If problem persists, replace control board. -F3H- Connect a new sensor to the board. If no failure code appears when starting Humidity sensor failure sensor function, replace sensor. Otherwise, replace control board. -F6- Check wiring to relay 4903 for short circuits. If wiring is okay, replace Microwave relay failure control board. OTE - The turntable will always be reset to rotating mode, i.e., after cooking is done or when OFF/CACEL is pressed. FO SEVICE TECHICIA'S USE OLY PAT O /86969

2 PAGE TECH SHEET - DO OT DISCAD SCHEMATIC DIAGAM 4 O SECODAY Y8 8 9 L8 8 0 P H.V. CF TT SM 4 0 TASFOME 3 O0 CL P 0 L8 MAGETO O / DO 0 FA O / F Door P3 TTM 3P3 F/L 5P3 ELECTOIC COTOL OAD / 8 50 M LFS Y/ 4906 TTM 490 F/L 606 H.V. CAPACITO 703 Sec. 49 Light 49 ight Light 4903 Microwave elay / Prim. L.V. Transformer L H.V. DIODE UP SM E P FS P3 CF CL HF TT HL P3 P HF P0 P0 L P8 FT P8 Light P 0 0 Motor 7 L L L8 3 8 MOITO PIMAY Cavity G 30 Y0 3 8 HF Capacitor Y0 4P 3 8 HL HL 33 8 HUMIDITY SESO Exhaust Fan Thermostat 5P L CODITIO: DOO OPE DG O. MU-046 Magnetron Thermostat Thermostat SYMOL OTES 8 IE SIZE - AG8 P0/P/P/P3: COECTOS STIE MOTO COOLIG FA MOTO LAMP IE COLO - O IE O. - : O O: OAGE : HITE G: GEE Y: YELLO : LACK L: LUE : ED HOOD FA MOTO TUTALE MOTO HOOD LAMP PAT O /86969 FO SEVICE TECHICIA'S USE OLY

3 TECH SHEET - DO OT DISCAD PAGE 3 PICTOIAL DIAGAM & SADDLE HIGH VOLTAGE COMPOET LACK UPPE SUPPOT LUE O HITE LACK POE COD SECODAY SITCH ED TO POLES COECTO GEE LUE H.V. CAPACITO HITE LACK LACK HUMIDITY SESO MAGETO THEMOSTAT HITE ED Y/G OAGE/ ED ED/ HITE OAGE EXHAUST FA THEMOSTAT ELECTOIC COTOL OAD ED ED LUE ED/ HITE POE H.V. TASFOME ED/ HITE YELLO/ HITE 700 OAGE/ ED ED O P HITE OAGE/ ED LACK LOE SUPPOT MOITO COECTO SITCH MOTO CAPACITO 50 LUE LUE H.V. DIODE ED LACK HITE HITE P ED LACK ED LUE YELLO/ HITE HITE HOOD FA MOTO LACK HITE GEE 4903 PIMAY SITCH HITE MAGETO THEMOSTAT LUE LUE OAGE HITE ED O P8 YELLO O O LACK ED HITE LACK LAMP & LAMP HOLDE HOOD LAMP & LUE HOOD LAMP HOLDE HITE P LACK HITE P3 P P8 P3 HITE HITE HITE O OAGE HITE HITE SIX POLES O COECTO YELLO YELLO HITE ED OAGE LUE HITE HITE YELLO YELLO DG O. L-M-035 ED STIE MOTO TUTALE MOTO COOLIG FA MOTO HITE HITE YELLO HITE LUE LUE ED ED ED YELLO OAGE LUE HITE HITE FO SEVICE TECHICIA'S USE OLY PAT O /86969

4 PAGE 4 TECH SHEET - DO OT DISCAD PICTOIAL DIAGAM ELECTOIC COTOL OAD 700 P 50 HUMIDITY SESO HITE ED LACK P 4903 COOLIG FA MOTO TUTALE MOTO H.V. TAS- FOME YELLO ED HITE MOITO SECODAY TUTALE MOTO COOLIG FA MOTO P3 LUE OAGE ED HITE YELLO P8 YELLO O P3 P8 P P HITE LACK LUE O COOKTOP LAMP PIMAY HOOD FA MOTO EXHAUST FA THEMOSTAT MOITO DG O. L-M-038 PAT O /86969 FO SEVICE TECHICIA'S USE OLY

5 TECH SHEET - DO OT DISCAD PAGE 5 Cavity Thermostat opens at 65 C (39 F) closes at -35 C (-3 F) Humidity Sensor Stirrer Motor Hood (Exhaust) Fan Motor PATS LAYOUT ot to Scale Cavity Lamp Magnetron H.V. Capacitor Turntable Motor Hood (Cooktop) Lamps Secondary Interlock Switch Monitor Interlock Switch Primary Interlock Switch Touch Panel (Membrane Switch) Motor Capacitor PC (Control oard) Assembly Exhaust Fan Thermostat opens at 45 C (3 F) closes at 60 C (40 F) Magnetron Thermostat opens at 5 C (57 F) closes at 85 C (85 F) Line Fuse H.V. Transformer H.V. Diode Cooling Fan Motor Fuse Holder PIMAY, MOITO, AD SECODAY SITCH CHECKOUT POCEDUE Switch Primary Interlock Secondary Interlock Monitor Check y. Disconnect the wires at the Primary Interlock Switch.. Check from the common terminal (hite/rown wires) to the normally open terminal (hite wire).. Disconnect the wires at the Secondary Interlock Switch.. Check from the common terminal (lack wires) to the normally open terminal (hite/ed wires).. Disconnect the wires at the Secondary Interlock Switch.. Check from the common terminal (lack wires) to the normally closed terminal (Orange wire).. Disconnect the wires at the Monitor Switch.. Check from the common terminal (hite wire) to the normally open terminal (lue wires).. Disconnect the wires at the Monitor Switch.. Check from the common terminal (hite wire) to the normally closed terminal (ed/rown wires). Door Open Door Closed (+) Continuity ( ) o Continuity OTE: These diagrams are not intended to show a complete circuit, they represent the position of switches during DOO OPE and DOO CLOSED (continuity checks only). DOO CLOSED L (C) (O) (C) (O) (C) (O) DOO OPE L (C) (O) (C) (O) (C) (O) SECODAY SITCH MOITO SITCH PIMAY SITCH SECODAY SITCH MOITO SITCH PIMAY SITCH FO SEVICE TECHICIA'S USE OLY PAT O /86969

6 PAGE 6 TECH SHEET - DO OT DISCAD TOUCH PAEL COTIUITY DIAGAM Example of use: hen EVEAGE is selected, a resistance of less than 00 ohms will be observed between and 5 on the flex circuit connector. See diagram below. 4 PI FLEX CICUIT COECTO PI O STEAM COOK 6 CLOCK 7 STAT ETE JET STAT COOK SOUP FOZE VEGETALE COOK TIME SIMME COOK FOZE ETEE POPCO TIME TUTALE OFF O/OFF LIGHT O/IGHT/OFF COOK POE EHEAT EVEAGE AKED POTATO TIME SET VET FA 4 SPEEDS AM HOLD JET DEFOST DIE PLATE FESH VEGETALE OFF CACEL ESD GOUD PLAE TOUCH PAEL AD MICOCOMPUTE OAD TEST The microwave hood combination is provided with a self-diagnostic routine that can be accessed through the touch key pad. To initiate this routine:. Depress the OFF/CACEL button while opening the door, and while still depressing the OFF/CACEL button, unplug the microwave oven for two seconds and plug it KEY TALE FO TEST MODE Key ame In Circuit elay Display Position* POPCO - 5 AKED POTATO - 4 FESH VEGETALE - FOZE VEGETALE - FOZE ETEE - 5 EVEAGE - 4 DIE PLATE - SOUP - STEAM COOK 4 SIMME COOK Humidity sensor 5 JET DEFOST - 3 COOK - EHEAT - 4 COOK TIME - 5 COOK POE - 4 AM HOLD (Cavity light) 5 49 (Hood light) back in.. elease the OFF/CACEL button and then close the door. 3. ow, by pressing each button on the control panel, the number 8 will appear in the display to indicate that the circuits are complete and all relays are working. Key ame In Circuit elay Display Position* (Turntable motor) (ight light) 3 9 Triac (Hood fan) 0 - CLOCK uzzer 5 STAT/ETE - 5 TUTALE O/OFF - 3 LIGHT O/IGHT/OFF - 5 VET FA 4 SPEEDS - 4 JET STAT - TIME SET - 3 TIME OFF - OFF/CACEL - See Text * The o. 8 will appear in the display position indicated in the table. After 8 secs, Hmxxx will be displayed (xxx represents humidity reading). PAT O /86969 FO SEVICE TECHICIA'S USE OLY

7 TECH SHEET - DO OT DISCAD PAGE 7 TOULESHOOTIG GUIDE Complete the following steps before checking microwave circuitry:. Check the line voltage, household fuses or circuit breakers.. Check for loose wiring or miswiring within microwave. 3. Disconnect white wire frompower transformer and discharge high-voltage capacitor. 4. All testing must be done with an ohmmeter having a sensitivity of 0,000 ohms per volt or greater, and powered by at least a 9-volt battery. 5. All operational checks with microwave energy must be done with a load (453 cc [6 oz.] cup water in a glass measuring cup) in the microwave oven. MICOAVE COOKIG L 0 AMP SECODAY SITCH STIE MOTO 3.3k-4.k Ω LIGHT SM CF COOLIG FA MOTO 7-8 Ω Y TT TUTALE MOTO.7k-3.8k Ω MICOCOMPUTE OAD LO VOLTAGE TASFOME P DOO ELAY 5P3 (F/L) 3P3 TTM ELAY MICOAVE ELAY THEMOSTAT L PIMAY SITCH MOITO SITCH MAGETO THEMOSTAT L HIGH VOLTAGE SYSTEM LOE FA TUS O AUTOMATICALLY L MICOCOMPUTE OAD EXHAUST FA P THEMOSTAT P3 0 AMP L P8 P HF MOTO CAPACITO HOOD FA MOTO THEMOSTAT L LOE FA O (VAIALE SPEED) L MICOCOMPUTE OAD LO VOLTAGE THEMOSTAT 0 AMP TASFOME P L : LACK L: LUE : O G: GEE : ED : HITE Y: YELLO TIAC P3 P P8 L MOTO CAPACITO HF HOOD FA MOTO FO SEVICE TECHICIA'S USE OLY PAT O /86969

8 PAGE 8 TECH SHEET - DO OT DISCAD MICOAVE PLUGGED I - TIME OF DAY DISPLAYED L MICOCOMPUTE OAD LO VOLTAGE THEMOSTAT 0 AMP TASFOME P L DOO OPE - LIGHT IS O L MICOCOMPUTE OAD THEMOSTAT LO VOLTAGE 0 AMP TASFOME P L LIGHT 5P3 DOO ELAY (F/L) : LACK L: LUE : O G: GEE : ED : HITE Y: YELLO PAT O /86969 FO SEVICE TECHICIA'S USE OLY

9 TECH SHEET - DO OT DISCAD PAGE 9 COOKTOP LIGHT O HIGH L MICOCOMPUTE OAD LO VOLTAGE THEMOSTAT 0 AMP TASFOME L P LIGHT O ELAY P8 Y Y COOKTOP LIGHT COOKTOP LIGHT O LO (IGHT LIGHT) L MICOCOMPUTE OAD LO VOLTAGE THEMOSTAT 0 AMP TASFOME L P * ALLOS CUET TO FLO I OE DIECTIO OLY. DIODE* IGHT LIGHT O ELAY P8 Y Y COOKTOP LIGHT : LACK L: LUE : O G: GEE : ED : HITE Y: YELLO FO SEVICE TECHICIA'S USE OLY PAT O /86969

10 PAGE 0 COMPOET TESTS Discharge the high voltage capacitor and remove the lead wires from the primary winding of the high voltage transformer before conducting any of the following tests. Conduct all operation tests with () 453 cc (6 oz.) cup of water in the oven. TECH SHEET - DO OT DISCAD Conduct a microwave energy test after performing any tests or repairs to the microwave. Check that all wire leads are in the correct position before operating the microwave oven. Grasp wire connectors when removing the wire leads from microwave parts. COMPOET TEST ESULTS H.V. Transformer. emove wire leads.. Measure resistance (ohmmeter scale: x): Primary winding - Secondary winding - Filament winding - - Less than 0.5 ohm(approximate) - 00 ohms (approximate) - 0 ohms Magnetron 3. Measure resistance (ohmmeter scale: x000): Primary winding to grounding - Filament winding to grounding -. emove wire leads. Install the magnetron seal in the correct position. Check that the seal is in good condition. - ormal: Infinite - ormal: Infinite. Measure resistance (ohmmeter scale: x): Filament terminal - - ormal: Less than ohm Chassis H.V. Capacitor 3. Measure resistance (ohmmeter scale: x000): Filament to chassis -. Discharge capacitor.. emove wire leads. 3. Measure resistance (ohmmeter scale: x000): Terminal to terminal - - ormal: Infinite - ormal: Momentarily indicates several ohms, gradually returns to Infinite H.V. Diode (Some inexpensive meters may indicate infinite resistance both directions.) Terminal to case - - ormal: Infinite. Measure continuity, (ohmmeter scale: xk): Forward - - ormal: Continuity - Abnormal: Infinite. Measure continuity, (ohmmeter scale: xk): everse - - ormal: Infinite - Abnormal: Continuity COTIUED... PAT O /86969 FO SEVICE TECHICIA'S USE OLY

11 TECH SHEET - DO OT DISCAD PAGE COMPOET TEST ESULTS Cooling Fan Motor. emove wire leads.. Measure resistance (ohmmeter scale: x): - ormal: 7-8 ohms (approximate) - Abnormal: Infinite or several Turntable Motor/ Stirrer Motor Hood Exhaust Fan Motor Humidity Sensor T D K 3. emove wire leads.. Measure resistance (ohmmeter scale: x000):. emove wire leads.. Measure resistance (ohmmeter scale: x):. emove the 3-pin connector frompca (P). ote: Do not remove the attached resistor which is used for internal resistance calibration.. Measure resistance across pins & 3 (ohmmeter scale: x K): 3. Measure resistance across pins & 3 (ohmmeter scale: x K): Turntable Motor - ormal: ohms (approx.) - Abnormal: Infinite or several Stirrer Motor - ormal: ohms (approx.) - Abnormal: Infinite or several - ormal: lack - hite: ohms (approx.) lack - ed: ohms (approx.) - Abnormal: Infinite or several - ormal:.8k ohms (approx.) at 5 ±0 C - Abnormal: Infinite or several - ormal:.8k ohms (approx.) at 5 ±0 C - Abnormal: Infinite or several FO SEVICE TECHICIA'S USE OLY PAT O /86969

12 PAGE TECH SHEET - DO OT DISCAD PAT O /8699 OTE: This sheet contains important Technical Service Data FO SEVICE TECHICIA OLY DO OT EMOVE O DESTOY PAT O /86969 FO SEVICE TECHICIA'S USE OLY