PanasonicメーカーNN-ST452Wの使用説明書/サービス説明書
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© Panasonic Appliances Microwave Oven (Shanghai) Co., Ltd. 2012. NN-SD452W NN-ST462M NN-ST452W BPQ (U.K.) EPG (Continen tal Europe) Micro w av e Ov en ORDER NO.
2 NN-SD452W / NN-ST462M / NN-ST452W.
3 NN-SD452W / NN-ST462M / NN-ST452W.
1 SCHEMATIC DIAGRAM 5 2 DESCRIPTI ON OF OPERATING SEQU ENCE 6 2.1. Variable power cookin g contro l 6 2.2. Inverter power supply circuit 6 2.3. Turbo defros t, Auto cook 6 2.4. Sensor cooking 6 2.5. Steam sensor and digital progra mmer circuit 7 3 CAUTIONS TO BE OBSE RVED WHEN TROU BLESHOOTING 8 3.
1 SCHEMATIC DIAGR AM 5 NN-SD452W / NN-ST462M / NN-ST452W.
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.
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 time starts at the end of the 10 second period.
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 & rings whenever working close to or replacing the magnetron.
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 these circuits with the oven energized.
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 holding air guide A on the wave guide, then remove the air guide A.
4.3. Low voltage transformer and/or power relays (RY1, RY2) CAUTION: Be sure to ground any static electric charge built up in your body before handling the DPC.
6. Replace other components . To re-install component s: NOTE: After replacemen t 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 (Refer page 17).
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 edges will be exposed to outside.
4.8. Inverter power supply CAUTIONS 1. Always leave the grounding plate in place. 2. Always securely tighten the ground screw throug h the bottom of the chassis (base) . 3. Secur ely connect 3 lead wire conne ctors. 4. Make sure the heat sink has enough space (gap) from the oven.
WARNING 1. High voltage is presen t at the output termin als of the High Voltag e Inverter (U) includ ing aluminum heat sink during any cook cycle. 2. It is neither neces sary nor advisable to attem pt measuremen t of the high voltage.
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 recommend ed to use an AC line input current ammeter for testing.
6.1. Adjustment of primary latch switch, secondary latch switch and short switch. 1. Mount the Primary latch switch, the Secondary latch switch and the Short switch to the door hook assembly as shown in illustration.
7 TROUBLESHOOT ING GUIDE DANGER: HIGH VOLTAGES 1. DO NOT RE-ADJUST PRESET CONTROL on the H.V.Inverter (U). It is very dange rous to repair or adjust without prope r test equipm ent because this circuit generates very large current and high voltag e. Operating a misaligned inverter circuit is dange rous.
7.2. (Troublesh ooting) 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 defect ive. No display and no operation at all. 3. Open low voltage transformer 4.
7.3. Troublesho oting of inverter circuit (U) and magnetron This oven is programmed with a self diagnostics failure code system which will help for troubleshoo ting. H95, H97, H98 and H99 are the provided failure codes to indicate magnetron and inverter circuit problem areas.
7.4. 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: Follow the matrix table below to identify the problem source.
7.6. H.V. INVERTER MAIN PARTS LIST (Z606YBA00QP) Ref. No. Part No. Part Name & Description Pcs/Set Remarks Q701 Z1JAEV000003 IGBT 1 C701 ZCWHC3B104JA FILM CAPACITOR 1 0.
8 EXPLODED VIEW AND PART S LIST 8.1. EXPLODED VIEW 23 NN-SD452W / NN-ST462M / NN-ST452W.
8.2. PARTS LIST NOTE: 1. When ordering replacemen t part(s), please use part number(s) shown in this part list. Do not use description of the part. 2. Important safety notice: Component s identified by mark have special characterist ics important for safety.
8.3. ESCUTCHE ON BASE ASSEMBLY 8.3.1. NN-SD452W Ref. No. Part No. Part Name & Description Pcs/Set Remarks E1 Z603L9Y70EP D.P.CIRCUIT (AU) 1 SD452W EPG E2 Z603Y9Y70EP D.
8.3.2. NN-ST462M, ST452W Ref. No. Part No. Part Name & Description Pcs/Set Remarks E21 Z603L9Y60BP D.P.CIRCUIT (AU) 1 ST462M BPQ,ST452W BPQ E23 Z80349Y10SHP ESCUTCHEON BASE 1 ST462M BPQ E23 Z80349.
8.4. DOOR ASSEMBLY Ref. No. Part No. Part Name & Description Pcs/Set Remarks D1 Z30189Y00AP DOOR KEY A 1 D2 Z302A9Y70HEP DOOR A (U) 1 SD452W EPG D2 Z302A9Y60SBP DOOR A (U) 1 ST462M BPQ D2 Z302A9Y6.
8.5. WIRING MATERIAL S Ref. No. Part No. Part Name & Description Pcs/Set Remarks W1 Z030A9Y60BP LEAD WIRE HARNESS 1 (INCLUDING MAGNETRON THERMISTOR) W2 Z030E9Y10QP H.
8.6. PACKING AND ACCESSOR IES Ref. No. Part No. Part Name & Description Pcs/Set Remarks P1 Z00039Y60BP INSTRUCTION MANUAL 1 ST462M BPQ,ST452W BPQ P1 Z00039Y70EP INSTRUCTION MANUAL 1 SD452W EPG P2 .
9 DIGITAL PROGRAMM ER CIRCUIT 9.1. SCHEMATIC DIAGRAM (NN-SD452W) 30 NN-SD452W / NN-ST462M / NN-ST452W.
31 NN-SD452W / NN-ST462M / NN-ST452W.
9.2. SCHEMATIC DIAGRAM (NN-ST462M , ST452W) 32 NN-SD452W / NN-ST462M / NN-ST452W.
33 NN-SD452W / NN-ST462M / NN-ST452W 01/12 S-9Y6, S-9Y7 Printed in China.
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