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ORDER NO.PHAMOS0801002C3
E1
Microwave Oven
NN-SD698S
NN-ST678S
NN-ST658W
RPH (LATIN AMERICA)
RUH (MEXICO)
© 2008 Panasonic Home Appliances Microwave
Oven (Shanghai) Co., Ltd. All rights reserved.
Unauthorized copying and distribution is a violation
of law.
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NN-SD698S / NN-ST678S / NN-ST658W CONTENTS Page Page 1 SCHEMATICDIAGRAM 5 5.5. Inverterpowersupply(U) 15 2 DESCRIPTIONOFOPERATINGSEQUENCE 6 5.6. Temperaturethermistor 15 2.1. Variablepowercookingcontrol 6 6 MEASUREMENTSANDADJUSTMENTS 16 2.2. Inverterpowersupplycircuit 6 6.1. Adjustmentofprimarylatchswitch,secondarylatchswitch 2.3. Inverterdefrost 6 and monitor interlock switch. 16 2.4. Sensorcooking 6 6.2. Measurementofmicrowaveoutput 16 2.5. Sensorreheat 7 7 PROCEDUREFORMEASURINGMICROWA
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NN-SD698S / NN-ST678S / NN-ST658W 1 SCHEMATICDIAGRAM 5
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NN-SD698S / NN-ST678S / NN-ST658W 2 DESCRIPTIONOFOPERATINGSEQUENCE 2.1. Variablepowercooking 2.3. Inverterdefrost control When the Auto Control feature is selected and the Start pad is tapped: High Voltage Inverter Power Supply (U) controls output power 1. Thedigitalprogramercircuitdeterminesthepowerleveland by the signal from Digital Programmer Circuit (DPC). Power cooking time to complete cooking and indicates the relay always stay on, but PWM (Pulse Width Modulation) signal operating state i
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NN-SD698S / NN-ST678S / NN-ST658W Explanation of the Auto Sensor Cooking process 2.5. Sensorreheat 1. During the first 10 second period there is no microwave Auto Sensor Reheat is a quick and easy way to reheat activity. When calculating the T2 time by using the refrigerated and room temperature foods. formula below make sure this 10 seconds is subtracted Simply press the reheat pad. There is no need to select power from the T1 time. In other words, T1 time starts at the level and cooking time.
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NN-SD698S / NN-ST678S / NN-ST658W 3 CAUTIONSTOBEOBSERVEDWHEN 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. CAUTION Servicemen should remove their watches and rings whenever working close to or replacing the magnetron. 3.1. Checkthegrounding Do not operate on a two wire extension cord. The microwave oven is designed to be grounded when used. It is i
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NN-SD698S / NN-ST678S / NN-ST658W Discharging the high voltage capacitors 3.6. Verificationafterrepair 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. are neither loosen or missing. in the circuits of the primary and secondary windings, choke Microwave energy might leak if screws are not properly coil and heat sinkof the inverter. It is extremely dangerous tightened. to work on or near thes
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NN-SD698S / NN-ST678S / NN-ST658W 4 DISASSEMBLYANDPARTSREPLACEMENT PROCEDURE 4.1. Magnetron 4.2. Digitalprogrammercircuit (D.P.C) 1. Discharge high voltage charge. 2. Remove 1 screw holding air guide A on the oven cavity. CAUTION: 3. Remove 1 screw holding air guide A on the magnetron. Be sure to ground any static electric charge built up in 4. Remove 1 screw holding air guide B. your body before handling the DPC. 1. Disconnect all connectors from D.P.C. 5. Remove 1 screw holding themistor
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NN-SD698S / NN-ST678S / NN-ST658W 4.3. Lowvoltagetransformer 4.5. Doorassembly and/or power relays (RY1, 1. Remove door C from door E by carefully pulling outward, starting from upper right hand corner using a flat blade RY2) screwdriver. CAUTION: 2. Separate door E from tabs on door A and remove door A. Be sure to ground any static electric charge built up in 3. Open Door E at the opening angle of approximately your body before handling the DPC. 10°(Note: The door cannot be removed if the op
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NN-SD698S / NN-ST678S / NN-ST658W 4.6. Turntablemotor 4.7. Steamsensor 1. Remove the motor cover by breaking off at the 8 spots 1. Disconnect connector CN2 from digital programmer circuit indicated by arrows with a cutter or the like. board. 2. Disengage catch hooks on sensor cover C from orifice. 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. 3. Remove steam sensor from orifice. 2.
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NN-SD698S / NN-ST678S / NN-ST658W 6. Press 1 encircled locking tab and then slide 4 locking tabs 4.8. Inverterpowersupply of Inverter bracket at the bottom of the base in direction of arrows. 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 space (gap) from the oven. Take special care not to dress any lead wire over the alu
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NN-SD698S / NN-ST678S / NN-ST658W 5 COMPONENTTESTPROCEDURE WARNING 5.3. Magnetron 1. High voltage is present at the output terminals of the High Voltage Inverter (U) including aluminum heat sink during any cook cycle. Continuity checks can only indicate an open filament or a 2. It is neither necessary nor advisable to attempt measurement of the shorted magnetron. To diagnose for an open filament or high voltage. shorted magnetron. 3. Before touching any oven components, or wiring, always unplug
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NN-SD698S / NN-ST678S / NN-ST658W 5.5. Inverterpowersupply(U) 5. Program oven at High power for 1 minute and press [Start] DO NOT try to REPAIR H.V. Inverter power supply (U). pad. Replace complete H.V. Inverter(U) Unit. a. After approximately 3 seconds, oven stops operating. b. During oven operation, the input current is approximately 0.4A. INPUT CURRENT FAILURE CODE Unplug CN701 0.4A Oven stops in 3 seconds after started. If both a and b check OK, the Inverter Power Supply (U) can be determ
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NN-SD698S / NN-ST678S / NN-ST658W 6 MEASUREMENTSANDADJUSTMENTS 6.1. Adjustmentofprimarylatch switch, secondary latch switch and monitor interlock switch. 1. Mount the Primary latch switch, the Secondary latch switch and the Monitor interlock switch to the door hook assembly as shown in illustration. NOTE: 6.2. Measurementofmicrowave No specific individual adjustments during installation of the Primary latch switch, Secondary output latch switch or Monitor interlock switch to the door The output
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NN-SD698S / NN-ST678S / NN-ST658W 7 PROCEDUREFORMEASURINGMICROWAVEENERGY LEAKAGE 7.2.1. Measurementwiththeouterpanel 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. Special care should be taken in measuring around the magnetron. 7.1. Equipment • Electromagnatic radiation monitor 7.2.2. Measurementswithafully • Glass thermometer 212°F or 100°C assembled oven. • 600cc glas
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NN-SD698S / NN-ST678S / NN-ST658W 7.4. Atleastonceayear,havethe radiation monitor checked for calibration by its manufacturer. 18
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NN-SD698S / NN-ST678S / NN-ST658W 8 TROUBLESHOOTINGGUIDE 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. Operating a misaligned inverter circuit is dangerous. 2. Ensure proper grounding before troubleshooting. 3. Be careful of the high voltage circuitry, taking necessary precautions when troubleshooting. 4. Discharge high vol
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NN-SD698S / NN-ST678S / NN-ST658W 8.2. (Troubleshooting)Otherproblems 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 voltage transformer 4. Defective DPC 2. No display and no operation at all. 1. Shorted lead wire harness Check adjustment of primary, secondary latch Fuse is blown. switch and monitor interlock switch including 2. Defecti
