Philips NN-SD681S Service Manual

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[Page 1] Philips NN-SD681S

© Panasonic Home Appliances Microwave Oven (Shanghai) Co., Ltd. 2011. NN-SD681S NN-SN671S NN-SN661S NN-SA661S NN-SA651S NN-SN651B NN-SN651W NN-SA631B NN-SA631W APH (USA) Microwave Oven ORDER NO.PHAMOS1105001CE E1 ...

[Page 2] Philips NN-SD681S

2 NN-SD681S / NN-SN671S / NN-SN661S / NN-SA661S / NN-SA651S / NN-SN651B / NN-SN651W / NN-SA631B / NN-SA631W ...

[Page 3] Philips NN-SD681S

3 NN-SD681S / NN-SN671S / NN-SN661S / NN-SA661S / NN-SA651S / NN-SN651B / NN-SN651W / NN-SA631B / NN-SA631W ...

[Page 4] Philips NN-SD681S

1 SCHEMATIC DIAGRAM 5 1.1. NN-SD681S 5 1.2. EXCEPT NN-SD681S 6 2 DESCRIPTION OF OPERATING SEQUENCE 7 2.1. Variable power cooking control 7 2.2. Inverter power supply circuit 7 2.3. Inverter defrost 7 2.4. Sensor cooking (Only for senso...

[Page 5] Philips NN-SD681S

1 SCHEMATIC DIAGRAM 1.1. NN-SD681S 5 NN-SD681S / NN-SN671S / NN-SN661S / NN-SA661S / NN-SA651S / NN-SN651B / NN-SN651W / NN-SA631B / NN-SA631W ...

[Page 6] Philips NN-SD681S

1.2. EXCEPT NN-SD681S 6 NN-SD681S / NN-SN671S / NN-SN661S / NN-SA661S / NN-SA651S / NN-SN651B / NN-SN651W / NN-SA631B / NN-SA631W ...

[Page 7] Philips NN-SD681S

2.1. Variable power cooking control High Voltage Inverter Power Supply (U) controls output power by the signal from Digital Programmer Circuit (DPC). Power relay always stay on, but PWM (Pulse Width Modulation) signal controls microwave output power....

[Page 8] Philips NN-SD681S

Explanation of the Auto Sensor Cooking process 1. During the first 10 second period there is no microwave activity. When calculating the T2 time by using the formula below make sure this 10 seconds is subtracted from the T1 time. In other words, T1 ...

[Page 9] Philips NN-SD681S

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. CAUTION Servicemen should remove their watches and rings whenever work...

[Page 10] Philips NN-SD681S

Discharging the high voltage capacitors WARNING There is high voltage present with high current capabilities in the circuits of the primary and secondary windings, choke coil and heat sink of the inverter. It is extremely dangerous to work on or near...

[Page 11] Philips NN-SD681S

4.1. Magnetron 1. Discharge the high voltage capacitor. 2. Remove 1 screw holding air guide A on the magnetron. 3. Remove 1 screw holding air guide A on cavity top plate. 4. Remove 1 screws holding thermistor on the magnetron. 5. Remove 1 screw ...

[Page 12] Philips NN-SD681S

4.3. Low voltage transformer and/or power relays (RY1) CAUTION: Be sure to ground any static electric charge built up in your body before handling the DPC. 1. Replace D.P.C. board. (A) Using solder wick or a desoldering tool and 30W soldering iron c...

[Page 13] Philips NN-SD681S

6. Replace other components. 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. Adjustment of the door assembly (Refe...

[Page 14] Philips NN-SD681S

4.6. Turntable motor 1. Remove the motor cover by breaking off at the 8 spots indicated by arrows with a cutter or the like. NOTE: After removing the motor cover, be sure that cut portions are properly trimmed or bent to the inside so that no sharp ...

[Page 15] Philips NN-SD681S

4.8. Inverter power supply CAUTIONS 1. Always leave the grounding plate in place. 2. Always securely tighten the ground screw through the bottom of the chassis (base). 3. Securely connect 3 lead wire connectors. 4. Make sure the heat sink has enough ...

[Page 16] Philips NN-SD681S

WARNING 1. High voltage is present at the output terminals of the High Voltage Inverter (U) including aluminum heat sink during any cook cycle. 2. It is neither necessary nor advisable to attempt measurement of the high voltage. 3. Before touching an...

[Page 17] Philips NN-SD681S

5.5. Inverter power supply (U) DO NOT try to REPAIR H.V. Inverter power supply (U). Replace complete H.V. Inverter(U) Unit. WARNING: HIGH VOLTAGE Test if failure codes H95, H97 or H98 appear when performing the following procedure. It is recommended ...

[Page 18] Philips NN-SD681S

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. NOTE: No spe...

[Page 19] Philips NN-SD681S

NOTE: The U.S. Government standard is 5 mW/cm 2 while in the customer’s home. 2mW/cm 2 stated here is our own voluntary standard. (1mW/cm 2 for Canada) 7.1. Equipment • Electromagnatic radiation monitor • Glass thermometer 212°F or 100°C �...

[Page 20] Philips NN-SD681S

7.4. At least once a year, have the radiation monitor checked for calibration by its manufacturer. 20 NN-SD681S / NN-SN671S / NN-SN661S / NN-SA661S / NN-SA651S / NN-SN651B / NN-SN651W / NN-SA631B / NN-SA631W ...

[Page 21] Philips NN-SD681S

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. Opera...

[Page 22] Philips NN-SD681S

8.1. (Troubleshooting) Oven stops operation during cooking SYMPTOM CAUSE CORRECTIONS 1. Oven stops in 3 seconds after pressing [Start] pad No 120V AC is supplied to H.V.Inverter (U) CN702 terminals 1. Interlock Switch 2. Power relay RY1 3. Loose lead...

[Page 23] Philips NN-SD681S

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. No display and no operation at all. 3. Open low vol...

[Page 24] Philips NN-SD681S

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 inverte...

[Page 25] Philips NN-SD681S

8.4. Trouble related to Digital Programmer Circuit 8.4.1. NN-SD681S SYMPTOM STEP CHECK RESULT CAUSE/CORRECTIONS No display when oven is first plugged in 1 Fuse pattern of D.P.C. Normal →Step2 Open Replace D.P.C. or Fuse Pattern 2 Low voltage transf...

[Page 26] Philips NN-SD681S

8.4.2. EXCEPT NN-SD681S SYMPTOM STEP CHECK RESULT CAUSE/CORRECTIONS No display when oven is first plugged in 1 Fuse pattern of D.P.C. Normal →Step2 Open Replace D.P.C. or Fuse Pattern 2 Low voltage transforment (L.V.T.) secondary voltage Abnormal 0...

[Page 27] Philips NN-SD681S

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. Procedure...

[Page 28] Philips NN-SD681S

8.7. How to check the semiconductors using an OHM meter 28 NN-SD681S / NN-SN671S / NN-SN661S / NN-SA661S / NN-SA651S / NN-SN651B / NN-SN651W / NN-SA631B / NN-SA631W ...

[Page 29] Philips NN-SD681S

9 EXPLODED VIEW AND PARTS LIST 9.1. EXPLODED VIEW 29 NN-SD681S / NN-SN671S / NN-SN661S / NN-SA661S / NN-SA651S / NN-SN651B / NN-SN651W / NN-SA631B / NN-SA631W ...

[Page 30] Philips NN-SD681S

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. 2. Important safety notice: Components identified by mark have special characteristics important for ...

[Page 31] Philips NN-SD681S

9.3. ESCUTCHEON BASE ASSEMBLY 9.3.1. NN-SD681S Ref. No. Part No. Part Name & Description Pcs/Set Remarks E1 F603L9Y40AP D.P.CIRCUIT(AU) 1 SD681S E2 F603Y9Y40AP D.P.CIRCUIT(DU) 1 SD681S E3 F800L9Y40SAP ESCUTCHEON BASE(U) 1 SD681S E4 F891P9Y40SAP D...

[Page 32] Philips NN-SD681S

9.3.2. NN-SN671S, SN661S, SA661S, SA651S Ref. No. Part No. Part Name & Description Pcs/Set Remarks E21 F603L9Y00AP D.P.CIRCUIT(AU) 1 SN671S,SN661S E21 F603L9Y10AP D.P.CIRCUIT(AU) 1 SA661S,SA651S E23 F800L9Y80SAP ESCUTCHEON BASE(U) 1 SN671S E23 F8...

[Page 33] Philips NN-SD681S

9.3.3. NN-SN651B, SN651W, SA631B, SA631W Ref. No. Part No. Part Name & Description Pcs/Set Remarks E41 F603L9Y00AP D.P.CIRCUIT(AU) 1 SN651B,SN651W E41 F603L9Y10AP D.P.CIRCUIT(AU) 1 SA631B,SA631W E43 F80349Y10BAP ESCUTCHEON BASE 1 SN651B,SA631B E4...

[Page 34] Philips NN-SD681S

9.4. DOOR ASSEMBLY Ref. No. Part No. Part Name & Description Pcs/Set Remarks D1 F30189Y00AP DOOR KEY A 1 D2 F302A9Y40SAP DOOR A(U) 1 SD681S D2 F302A9Y30SAP DOOR A(U) 1 SN671S D2 F302A9Y20SAP DOOR A(U) 1 SN661S,SA661S,SA651S D2 F302A9Y10BAP DOOR A...

[Page 35] Philips NN-SD681S

9.5. WIRING MATERIALS Ref. No. Part No. Part Name & Description Pcs/Set Remarks W1 F030A9Y00AP LEAD WIRE HARNESS 1 (INCLUDING MAGNETRON THERMISTOR) W2 F030E9Y00AP H.V.LEAD WIRE 1 35 NN-SD681S / NN-SN671S / NN-SN661S / NN-SA661S / NN-SA651S / NN-S...

[Page 36] Philips NN-SD681S

9.6. PACKING AND ACCESSORIES Ref. No. Part No. Part Name & Description Pcs/Set Remarks P1 F00039Y40AP INSTRUCTION MANUAL 1 SD681S P1 F00039Y00AP INSTRUCTION MANUAL 1 SN671S,SN661S,SN651B,SN651W P1 F00039Y10AP INSTRUCTION MANUAL 1 SA661S,SA651S,SA...

[Page 37] Philips NN-SD681S

10 DIGITAL PROGRAMMER CIRCUIT 10.1. SCHEMATIC DIAGRAM (NN-SD681S) 37 NN-SD681S / NN-SN671S / NN-SN661S / NN-SA661S / NN-SA651S / NN-SN651B / NN-SN651W / NN-SA631B / NN-SA631W ...

[Page 38] Philips NN-SD681S

38 NN-SD681S / NN-SN671S / NN-SN661S / NN-SA661S / NN-SA651S / NN-SN651B / NN-SN651W / NN-SA631B / NN-SA631W ...

[Page 39] Philips NN-SD681S

10.2. SCHEMATIC DIAGRAM (EXCEPT NN-SD681S) 39 NN-SD681S / NN-SN671S / NN-SN661S / NN-SA661S / NN-SA651S / NN-SN651B / NN-SN651W / NN-SA631B / NN-SA631W ...

[Page 40] Philips NN-SD681S

40 NN-SD681S / NN-SN671S / NN-SN661S / NN-SA661S / NN-SA651S / NN-SN651B / NN-SN651W / NN-SA631B / NN-SA631W ...

[Page 41] Philips NN-SD681S

10.3. PARTS LIST 10.3.1. NN-SD681S Ref. No. Part No. Part Name & Description Pcs/Set Remarks BZ210 L0DDEA000014 BUZZER 1 2.0KHz C10 F2A1H471B575 AL CHEM CAPACITOR 1 470µF/50V C11 F2A1C220B624 AL CHEM CAPACITOR 1 22µF/16V C482 F2A1H1R0B574 AL CH...

[Page 42] Philips NN-SD681S

10.3.3. NN-SA661S, SA651S, SA631B/W Ref. No. Part No. Part Name & Description Pcs/Set Remarks BZ210 L0DDEA000014 BUZZER 1 2.0KHz C10 F2A1H471B575 AL CHEM CAPACITOR 1 470µF/50V C11 F2A1C220B624 AL CHEM CAPACITOR 1 22µF/16V DISP110 L5AYAYY00096 L...