Panasonic NN-ST681S Service Manual
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Summary of Contents for Panasonic NN-ST681S
- Page 1 ORDER NO.PHAMOS1105002CE Microwave Oven NN-SD691S NN-ST681S NN-SD671S NN-ST671S NN-ST661S NN-ST661B NN-ST661W NN-ST651B NN-ST651W CPH (CANADA) © Panasonic Home Appliances Microwave Oven (Shanghai) Co., Ltd. 2011.
- Page 2 NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W...
- Page 3 NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W...
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Page 4: Table Of Contents
NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W CONTENTS Page Page 1 SCHEMATIC DIAGRAM 5.3. Magnetron 1.1. NN-SD691S, SD671S 5.4. key board membrane (Membrane switch assembly) 1.2. EXCEPT NN-SD691S & NN-SD671S 5.5. -
Page 5: Schematic Diagram
NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 1 SCHEMATIC DIAGRAM 1.1. NN-SD691S, SD671S... -
Page 6: Except Nn-Sd691S & Nn-Sd671S
NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 1.2. EXCEPT NN-SD691S & NN-SD671S... -
Page 7: Description Of Operating Sequence
NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 2 DESCRIPTION OF OPERATING SEQUENCE 2.1. Variable power cooking 2.3. Inverter defrost control When the Auto Control feature is selected and the Start pad is... -
Page 8: Sensor Reheat (Only For Sensor Models)
NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W Explanation of the Auto Sensor Cooking process NOTE: 1. During the first 10 second period there is no microwave When "More" or "Less" pad is selected, the K factor varies activity. -
Page 9: Cautions To Be Observed When Troubleshooting
NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 3 CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING Unlike many other appliances, the microwave oven is a high voltage, high current device. It is free from danger in ordinary use, though extreme care should be taken during repair. -
Page 10: Part Replacement
NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 3.6. Verification after repair Discharging the high voltage capacitors WARNING 1. After repair or replacement of parts, make sure that the There is high voltage present with high current capabilities screws of the oven, etc. -
Page 11: Disassembly And Parts Replacement Procedure
NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 4 DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE 4.1. Magnetron 1. Discharge the high voltage capacitor. 2. Remove 1 screw holding air guide A on the magnetron. -
Page 12: Low Voltage Transformer And/Or Power Relays (Ry1, Ry2)
NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 4.5. Door assembly 1. Support the door, remove 3 screws holding hinge A. 4.3. Low voltage transformer and/or power relays (RY1, RY2) CAUTION: 2. - Page 13 NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 6. Replace other components. 9. Tighten 2 mounting screws. To re-install components: NOTE: After replacement of the defective component parts of the door, reassemble it properly and adjustment so as to prevent an excessive microwave leakage.
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Page 14: Turntable Motor
NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 4.6. Turntable motor 4.7. Steam sensor (Only for sensor models) 1. Remove the motor cover by breaking off at the 8 spots indicated by arrows with a cutter or the like. -
Page 15: Inverter Power Supply
NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 4.8. Inverter power supply 6. Remove 1 screw holding H.V.Inverter to Inverter bracket. CAUTIONS 1. Always leave the grounding plate in place. 2. Always securely tighten the ground screw through the bottom of the chassis (base). -
Page 16: Component Test Procedure
NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 5 COMPONENT TEST PROCEDURE 5.3. Magnetron WARNING 1. High voltage is present at the output terminals of the High Voltage Inverter (U) including aluminum heat sink during any cook cycle. -
Page 17: Inverter Power Supply (U)
NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 5.5. Inverter power supply (U) 4. Program DPC. For SD691S & SD671S models DO NOT try to REPAIR H.V. Inverter power supply (U). -
Page 18: Measurements And Adjustments
NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 6 MEASUREMENTS AND ADJUSTMENTS 6.1. Adjustment of primary interlock switch, secondary interlock switch and monitor switch. 1. Mount the Primary interlock switch, the Secondary interlock switch and the Monitor switch to the door hook assembly as shown in illustration. -
Page 19: Procedure For Measuring Microwave Energy Leakage
NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 7 PROCEDURE FOR MEASURING MICROWAVE ENERGY LEAKAGE 7.2.1. Measurement with the outer panel removed. Whenever you replace the magnetron, measure for radiation leakage before the outer panel is installed and after all necessary components are replaced or adjusted. -
Page 20: At Least Once A Year, Have The Radiation Monitor Checked For Calibration By Its Manufacturer
NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 7.4. At least once a year, have the radiation monitor checked for calibration by its manufacturer. -
Page 21: Troubleshooting Guide
NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 8 TROUBLESHOOTING GUIDE DANGER: HIGH VOLTAGES 1. DO NOT RE-ADJUST PRESET CONTROL on the H.V.Inverter (U). It is very dangerous to repair or adjust without proper test equipment because this circuit generates very large current and high voltage. -
Page 22: Troubleshooting) Oven Stops Operation During Cooking
NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 8.1. (Troubleshooting) Oven stops operation during cooking SYMPTOM CAUSE CORRECTIONS 1. Oven stops 3 seconds after No 120V AC is supplied to H.V.Inverter (U) CN702 1. -
Page 23: Troubleshooting) Other Problems
NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 8.2. (Troubleshooting) Other problems SYMPTOM CAUSE CORRECTIONS 1. Oven is dead. 1. Open or loose lead wire harness Fuse is OK. 2. Open thermal cutout / thermistor Check thermal cutout is defective. -
Page 24: Troubleshooting Of Inverter Circuit (U) And Magnetron
NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 8.3. Troubleshooting of inverter circuit (U) and magnetron This oven is programmed with a self diagnostics failure code system which will help for troubleshooting. H95, H97, H98 and H99 are the provided failure codes to indicate magnetron and inverter circuit problem areas. -
Page 25: Trouble Related To Digital Programmer Circuit
NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 8.4. Trouble related to Digital Programmer Circuit 8.4.1. NN-SD691S, SD671S SYMPTOM STEP CHECK RESULT CAUSE/CORRECTIONS →Step2 No display when oven is first plugged Fuse pattern of D.P.C. - Page 26 NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 8.4.2. EXCEPT NN-SD691S & NN-SD671S SYMPTOM STEP CHECK RESULT CAUSE/CORRECTIONS →Step2 No display when oven is first plugged Fuse pattern of D.P.C. Normal Open Replace D.P.C.
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Page 27: Simple Way Of H.v. Inverter/Magnetron Troubleshooting
NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 8.5. SIMPLE WAY OF H.V. INVERTER/MAGNETRON TROUBLESHOOTING Purpose: Simple way (3/23 seconds rule) of identifying whether it’s Magnetron, Inverter or others. Set-up: The unit under question is connected through the Ammeter as shown below. -
Page 28: How To Check The Semiconductors Using An Ohm Meter
NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 8.7. How to check the semiconductors using an OHM meter... -
Page 29: Exploded View And Parts List
NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 9 EXPLODED VIEW AND PARTS LIST 9.1. EXPLODED VIEW... -
Page 30: Parts List
NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 9.2. PARTS LIST NOTE: 1. When ordering replacement part(s), please use part number(s) shown in this part list. Do not use description of the part. -
Page 31: Escutcheon Base Assembly
NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 9.3. ESCUTCHEON BASE ASSEMBLY 9.3.1. NN-SD691S, SD671S Ref. No. Part No. Part Name & Description Pcs/Set Remarks F603L9Y40CP D.P.CIRCUIT (AU) SD691S F603L9Y90CP D.P.CIRCUIT (AU) - Page 32 NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 9.3.2. NN-ST681S, ST671S, ST661S Ref. No. Part No. Part Name & Description Pcs/Set Remarks F603L9Y30CP D.P.CIRCUIT (AU) ST681S F603L9Y10CP D.P.CIRCUIT (AU) ST671S,ST661S F800L9Y30SCP...
- Page 33 NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 9.3.3. NN-ST661B, ST661W, ST651B, ST651W Ref. No. Part No. Part Name & Description Pcs/Set Remarks F603L9Y30CP D.P.CIRCUIT (AU) ST661B,ST661W F603L9Y10CP D.P.CIRCUIT (AU) ST651B,ST651W...
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Page 34: Door Assembly
NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 9.4. DOOR ASSEMBLY Ref. No. Part No. Part Name & Description Pcs/Set Remarks F30189Y00AP DOOR KEY A F302A9Y40SAP DOOR A (U) SD691S F302A9Y90SCP... -
Page 35: Wiring Materials
NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 9.5. WIRING MATERIALS Ref. No. Part No. Part Name & Description Pcs/Set Remarks F030A9Y00CP LEAD WIRE HARNESS (INCLUDING MAGNETRON THERMISTOR) F030E9Y00CP H.V.LEAD WIRE... -
Page 36: Packing And Accessories
NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 9.6. PACKING AND ACCESSORIES Ref. No. Part No. Part Name & Description Pcs/Set Remarks F00039Y40CP INSTRUCTION MANUAL SD691S,SD671S F00039Y00CP INSTRUCTION MANUAL ST681S,ST661B,ST661W F00039Y10CP... -
Page 37: Digital Programmer Circuit
NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 10 DIGITAL PROGRAMMER CIRCUIT 10.1. SCHEMATIC DIAGRAM (NN-SD691S, SD671S) - Page 38 NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W...
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Page 39: Schematic Diagram (Except Nn-Sd691S & Nn-Sd671S)
NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 10.2. SCHEMATIC DIAGRAM (EXCEPT NN-SD691S & NN-SD671S) - Page 40 NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W...
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Page 41: Parts List
NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 10.3. PARTS LIST 10.3.1. NN-SD691S, SD671S Ref. No. Part No. Part Name & Description Pcs/Set Remarks BZ210 L0DDEA000014 BUZZER 2.0KHz F2A1H471B575 AL CHEM CAPACITOR 470µF/50V... - Page 42 NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W 10.3.3. NN-ST661B, ST661W, ST651B, ST651W Ref. No. Part No. Part Name & Description Pcs/Set Remarks BZ210 L0DDEA000014 BUZZER 2.0KHz F2A1H471B575 AL CHEM CAPACITOR 470µF/50V...