Table of Contents
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Table of Contents
Troubleshooting
Related Manuals for Panasonic NN-SD798S
Summary of Contents for Panasonic NN-SD798S
- Page 1 ORDER NO.PHAMOS0801004C3 Microwave Oven NN-SD798S NN-ST778S NN-SA768W 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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Page 4: Table Of Contents
NN-SD798S / NN-ST778S / NN-SA768W CONTENTS Page Page 1 SCHEMATIC DIAGRAM 5.4. key board membrane (Membrane switch assembly) 2 DESCRIPTION OF OPERATING SEQUENCE 5.5. Inverter power supply (U) 2.1. Variable power cooking control 5.6. Temperature thermistor 2.2. Inverter power supply circuit 6 MEASUREMENTS AND ADJUSTMENTS 2.3. -
Page 5: Schematic Diagram
NN-SD798S / NN-ST778S / NN-SA768W 1 SCHEMATIC DIAGRAM... -
Page 6: Description Of Operating Sequence
NN-SD798S / NN-ST778S / NN-SA768W 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 tapped: High Voltage Inverter Power Supply (U) controls output power 1. -
Page 7: Sensor Reheat (Only For Sensor Models)
NN-SD798S / NN-ST778S / NN-SA768W 2.5. Sensor reheat (Only for sensor Explanation of the Auto Sensor Cooking process 1. During the first 10 second period there is no microwave models) activity. When calculating the T2 time by using the formula below make sure this 10 seconds is subtracted Auto Sensor Reheat is a quick and easy way to reheat from the T1 time. -
Page 8: Cautions To Be Observed When Troubleshooting
NN-SD798S / NN-ST778S / NN-SA768W 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 9: Part Replacement
NN-SD798S / NN-ST778S / NN-SA768W 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. are neither loosen or missing. -
Page 10: Disassembly And Parts Replacement Procedure
NN-SD798S / NN-ST778S / NN-SA768W 4 DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE 4.1. Magnetron 4.2. Digital programmer circuit (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 B. -
Page 11: Low Voltage Transformer And/Or Power Relays (Ry1, Ry2)
NN-SD798S / NN-ST778S / NN-SA768W 4.3. Low voltage transformer 4.5. Door assembly and/or power relays (RY1, 1. Remove door C from door E by carefully pulling outward, RY2) starting from upper right hand corner using a flat blade screwdriver. CAUTION: 2. -
Page 12: Turntable Motor
NN-SD798S / NN-ST778S / NN-SA768W 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. 1. Disconnect connector CN2 from digital programmer circuit board. -
Page 13: Inverter Power Supply
NN-SD798S / NN-ST778S / NN-SA768W 4.8. Inverter power supply 6. Press 1 encircled locking tab and then slide 4 locking tabs of Inverter bracket at the bottom of the base in direction of CAUTIONS arrows. 1. Always leave the grounding plate in place. -
Page 14: Component Test Procedure
NN-SD798S / NN-ST778S / NN-SA768W 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. Continuity checks can only indicate an open filament or a 2. -
Page 15: Inverter Power Supply (U)
NN-SD798S / NN-ST778S / NN-SA768W 5.5. Inverter power supply (U) 5. Program oven at High power for 1 minute and press [Start] pad. DO NOT try to REPAIR H.V. Inverter power supply (U). a. After approximately 3 seconds, oven stops operating. -
Page 16: Measurements And Adjustments
NN-SD798S / NN-ST778S / NN-SA768W 6 MEASUREMENTS AND ADJUSTMENTS 6.1. Adjustment of primary latch 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. -
Page 17: Procedure For Measuring Microwave Energy Leakage
NN-SD798S / NN-ST778S / NN-SA768W 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. Special care should be taken in measuring around the magnetron. -
Page 18: At Least Once A Year, Have The Radiation Monitor Checked For Calibration By Its Manufacturer
NN-SD798S / NN-ST778S / NN-SA768W 7.4. At least once a year, have the radiation monitor checked for calibration by its manufacturer. -
Page 19: Troubleshooting Guide
NN-SD798S / NN-ST778S / NN-SA768W 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. Operating a misaligned inverter circuit is dangerous. -
Page 20: Troubleshooting) Other Problems
NN-SD798S / NN-ST778S / NN-SA768W 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. -
Page 21: Troubleshooting Of Inverter Circuit (U) And Magnetron
NN-SD798S / NN-ST778S / NN-SA768W 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. This section explains failure codes of H95, H97, H98 and H99. -
Page 22: Simple Way Of H.v. Inverter/Magnetron Troubleshooting
NN-SD798S / NN-ST778S / NN-SA768W 8.4. SIMPLE WAY OF H.V. INVERTER/MAGNETRON TROUBLESHOOTING Purpose: Simple way (3/37 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. -
Page 23: How To Check The Semiconductors Using An Ohm Meter
NN-SD798S / NN-ST778S / NN-SA768W 8.6. How to check the semiconductors using an OHM meter... -
Page 24: Exploded View And Parts List
NN-SD798S / NN-ST778S / NN-SA768W 9 EXPLODED VIEW AND PARTS LIST 9.1. EXPLODED VIEW... -
Page 25: Parts List
NN-SD798S / NN-ST778S / NN-SA768W 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 safety. - Page 26 NN-SD798S / NN-ST778S / NN-SA768W Ref. No. Part No. Part Name & Description Pcs/Set Remarks F04468Y30RP FUNCTION LABEL SD798S F00066G00RP CAUTION LABEL SD798S RPH,ST778S RPH...
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Page 27: Escutcheon Base Assembly
NN-SD798S / NN-ST778S / NN-SA768W 9.3. ESCUTCHEON BASE ASSEMBLY 9.3.1. NN-SD798S Ref. No. Part No. Part Name & Description Pcs/Set Remarks F603L8Y30RP D.P.CIRCUIT (AU) SD798S F603Y8P00CP D.P.CIRCUIT (DU) SD798S F800L8Y30SRP ESCUTCHEON BASE (U) SD798S F66167D00AP FLAT CABLE SD798S F82988N00SAP BUTTON... - Page 28 NN-SD798S / NN-ST778S / NN-SA768W 9.3.2. NN-ST778S Ref. No. Part No. Part Name & Description Pcs/Set Remarks F603L8Y40RP D.P.CIRCUIT (AU) ST778S F800L8Y40SRP ESCUTCHEON BASE (U) ST778S F80724W70SAP DOOR OPENING BUTTON (U) ST778S F82564W00AP DOOR OPENING LEVER ST778S F80375K00AP COOK BUTTON SPRING...
- Page 29 NN-SD798S / NN-ST778S / NN-SA768W 9.3.3. NN-SA768W Ref. No. Part No. Part Name & Description Pcs/Set Remarks F603L8Y50RP D.P.CIRCUIT (AU) SA768W F603Y8Y90RP D.P.CIRCUIT (DU) SA768W F80347C50HAP ESCUTCHEON BASE SA768W F66164W20AP FLAT CABLE SA768W F82987D60KAP BUTTON SA768W F80727C50HAP DOOR OPENING BUTTON...
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Page 30: Door Assembly
NN-SD798S / NN-ST778S / NN-SA768W 9.4. DOOR ASSEMBLY Ref. No. Part No. Part Name & Description Pcs/Set Remarks F30186P40APG DOOR KEY A F301A8N40SAP DOOR A (U) SD798S F301A8R50SAP DOOR A (U) ST778S F302K4W00AP DOOR E (U) F30215G10XN DOOR KEY SPRING... -
Page 31: Wiring Materials
NN-SD798S / NN-ST778S / NN-SA768W 9.5. WIRING MATERIALS Ref. No. Part No. Part Name & Description Pcs/Set Remarks F030A6P40AG LEAD WIRE HARNESS F030E6G30AP H.V.LEAD WIRE F03537B70AP LEAD WIRE HARNESS (U) (INCLUDING THERMISTOR) -
Page 32: Packing And Accessories
NN-SD798S / NN-ST778S / NN-SA768W 9.6. PACKING AND ACCESSORIES Ref. No. Part No. Part Name & Description Pcs/Set Remarks F00038Y30RP INSTRUCTION MANUAL SD798S F00038V60RP INSTRUCTION MANUAL ST778S F00038Y50RP INSTRUCTION MANUAL SA768W F01028Y30SRP PACKING CASE,PAPER SD798S RPH F01028Y40SRP PACKING CASE,PAPER ST778S RPH... -
Page 33: Digital Programmer Circuit
NN-SD798S / NN-ST778S / NN-SA768W 10 DIGITAL PROGRAMMER CIRCUIT 10.1. NN-SD778S... - Page 34 NN-SD798S / NN-ST778S / NN-SA768W...
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Page 35: Nn-St778S
NN-SD798S / NN-ST778S / NN-SA768W 10.2. NN-ST778S... - Page 36 NN-SD798S / NN-ST778S / NN-SA768W...
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Page 37: Nn-Sa768W
NN-SD798S / NN-ST778S / NN-SA768W 10.3. NN-SA768W... - Page 38 NN-SD798S / NN-ST778S / NN-SA768W...
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Page 39: Parts List
NN-SD798S / NN-ST778S / NN-SA768W 10.4. PARTS LIST 10.4.1. NN-SD798S Ref. No. Part No. Part Name & Description Pcs/Set Remarks BZ210 L0DDEA000014 BUZZER 2.0KHz AECETS1C100B AL CHEM CAPACITOR 10µF/16V C111 ECEA1EKS101I AL CHEM CAPACITOR 100µF/25V AECETK1V102B AL CHEM CAPACITOR 1000µF/35V... - Page 40 NN-SD798S / NN-ST778S / NN-SA768W 10.4.3. NN-SA768W Ref. No. Part No. Part Name & Description Pcs/Set Remarks BZ210 L0DDEA000014 BUZZER 2.0KHz AECETK1V471B AL CHEM CAPACITOR 470µF/35V C13,C16 AECETS1C220B AL CHEM CAPACITOR 22µF/16V CX320 H2B800400007 CERAMIC RESONATOR 8MHz MN101C78AEH L.S.I. IC350...