Related Manuals for Panasonic NN-GT370M
Summary of Contents for Panasonic NN-GT370M
- Page 1 ORDER NO.PHAMOS1012084C3 Microwave Oven NN-GT370M KTE (UAE) PTE (Iran) ZPE (CIS Countries) © Panasonic Home Appliances Microwave Oven (Shanghai) Co., Ltd. 2010.
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Page 4: Table Of Contents
6.8. H.V. Inverter Power Supply 2 CONTROL PANEL 7 COMPONENT TEST PROCEDURE 3 SCHEMATIC DIAGRAM 7.1. Primary, Secondary Latch Switch interlocks & Power 3.1. NN-GT370M KTE/PTE Relay RY1 3.2. NN-GT370M ZPE 7.2. Short switch & monitor 4 DESCRIPTION OF OPERATING SEQUENCE 7.3. -
Page 5: Feature Chart
NN-GT370M 1 FEATURE CHART 2 CONTROL PANEL... -
Page 6: Schematic Diagram
NN-GT370M 3 SCHEMATIC DIAGRAM 3.1. NN-GT370M KTE/PTE... -
Page 7: Nn-Gt370M Zpe
NN-GT370M 3.2. NN-GT370M ZPE... -
Page 8: Description Of Operating Sequence
NN-GT370M 4 DESCRIPTION OF OPERATING SEQUENCE 4.1. Variable power cooking 4.3. Turbo defrost, Auto cook control When the Auto Control feature is selected and the [Start] pad is tapped: High Voltage Inverter Power Supply (U) controls output power 1. The digital programer circuit determines the power level and by the signal from Digital Programmer Circuit (DPC). -
Page 9: Cautions To Be Observed When Troubleshooting
NN-GT370M 5 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. CAUTION Servicemen should remove their watches and rings whenever working close to or replacing the magnetron. -
Page 10: Part Replacement
NN-GT370M • High voltage transformer (Located on inverter (U)) WARNING There is high voltage present with high current capabilities • High voltage diodes (Located on inverter (U)) in the circuits of the primary and secondary windings, choke • High voltage capacitors (Located on inverter (U)) coil and heat sink of the inverter. -
Page 11: Disassembly And Parts Replacement Procedure
NN-GT370M 6 DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE 6.1. Magnetron NOTE: After replacement of the magnetron,tighten mounting 1. Discharge the high voltage capacitor. screws properly, making sure there is no gap between 2. Remove 1 screw holding supporter on the magnetron. -
Page 12: Low Voltage Transformer And/Or Power Relays (Ry1)
NN-GT370M 6.3. Low voltage transformer 5. Separate D.P.C board from tabs on the escutcheon base and remove D.P.C board. and/or power relays (RY1) To replace membrane key board NOTE: 6. Remove 1 screw holding back plate and bracket on escutcheon base, then remove back plate and bracket. -
Page 13: Fan Motor
NN-GT370M 6.4. Fan motor 6.5. Door assembly 1. Disconnect 2 lead wires from fan motor terminals. 1. Support the door, remove 2 screws holding hinge A. 2. Remove 3 screws holding orifice assy and detach the orifice assy from oven assy. - Page 14 NN-GT370M 5. Remove door key and door key spring from door E. 9. Tighten 2 mounting screws. 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.
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Page 15: Turntable Motor
NN-GT370M 6.6. Turntable motor 6.7. Quartz heater 1. Remove the motor cover by breaking off at the 4 spots 1. Disconnect lead wires from both side of heater terminals. indicated by arrows with a cutter or the like. 2. Bend back 2 locking tabs on heater mounting plate A & B respectively. -
Page 16: Inverter Power Supply
NN-GT370M 6.8. H.V. Inverter Power Supply 6. Remove 2 screws holding H.V. inverter on the inverter bracket. 1. Disconnect 2 high voltage lead wires from magnetron filament terminals. 2. Unplug connector CN701 & CN702 from H.V. Inverter board. 3. Remove 1 screw holding grounding plate on the base. -
Page 17: Component Test Procedure
NN-GT370M 7 COMPONENT TEST PROCEDURE 7.3. 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 18: Inverter Power Supply (U)
NN-GT370M 7.4. 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 a. After approximately 3 seconds, oven stops operating. (U).Replace complete H.V. Inverter(U) Unit. -
Page 19: Measurements And Adjustments
NN-GT370M 8 MEASUREMENTS AND ADJUSTMENTS 8.1. Adjustment of Primary latch 8.2. Measurement of microwave switch, Secondary latch output switch and Short switch. The output power of the magnetron can be determined by performing IEC standard test procedures. However, due to the 1. -
Page 20: Troubleshooting Guide
NN-GT370M 9 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 21 NN-GT370M 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.
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Page 22: Troubleshooting Of Inverter Circuit (U) And Magnetron
NN-GT370M 9.2. 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 23: Trouble Related To Digital Programmer Circuit
NN-GT370M 9.3. Trouble related to Digital Programmer Circuit SYMPTOM STEP CHECK RESULT CAUSE/CORRECTIONS No display when oven is first plugged Fuse pattern of D.P.C. Normal →Step2 Open Replace D.P.C. or Fuse Pattern Low voltage transforment (L.V.T.) Abnormal 0V L.V.T. secondary voltage →Step3... -
Page 24: Simple Way Of H.v. Inverter/Magnetron Troubleshooting
NN-GT370M 9.4. 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. -
Page 25: Inverter Main Parts List (F606Ym300Bp)
NN-GT370M 9.6. H.V. Inverter main parts list (F606YM300BP) Ref. No. Part No. Part Name & Description Pcs/Set Remarks Q701 A691EM300BP IGBT Q702 IGBT C701 ECWF5184N300 FILM CAPACITOR C702 ECQE2505T869 FILM CAPACITOR C703 ECWF2395N632 FILM CAPACITOR DB701 B0FBBQ000007 RECTIFIER BRIDGE L701... -
Page 26: Exploded View And Parts List
NN-GT370M 10 EXPLODED VIEW AND PARTS LIST 10.1. EXPLODED VIEW... -
Page 27: Parts List
NN-GT370M 10.2. 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 28 NN-GT370M Ref. No. Part No. Part Name & Description Pcs/Set Remarks F692Y9W40ZP NOISE FILTER (U) F02395E20KN CORD CAUTION LABEL KTE,PTE...
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Page 29: Door Assembly
NN-GT370M 10.3. DOOR ASSEMBLY Ref. No. Part No. Part Name & Description Pcs/Set Remarks F30189V00XP DOOR KEY A F302A9V00KXP DOOR A (U) F302K9V00XP DOOR E (U) F30215G10XN DOOR KEY SPRING F30859V00XP DOOR C F31459W00XP DOOR SCREEN A... -
Page 30: Escutcheon Base Assembly
NN-GT370M 10.4. ESCUTCHEON BASE ASSEMBLY Ref. No. Part No. Part Name & Description Pcs/Set Remarks F603L9W40PT D.P.CIRCUIT (AU) KTE,PTE F603L9W40ZP D.P.CIRCUIT (AU) F630Y9W40KKT MEMBRANE SWITCH KTE,PTE F630Y9W40KZP MEMBRANE SWITCH F80349V30SHP ESCUTCHEON BASE F81279V30AP BACK PLATE F66139V30HP BACKSTOP... -
Page 31: Wiring Materials
NN-GT370M 10.5. WIRING MATERIALS Ref. No. Part No. Part Name & Description Pcs/Set Remarks F030A9W40HP LEAD WIRE HARNESS KTE,PTE F030A9W40ZP LEAD WIRE HARNESS F030E7K10XP H.V.LEAD WIRE... -
Page 32: Packing And Accessories
NN-GT370M 10.6. PACKING AND ACCESSORIES Ref. No. Part No. Part Name & Description Pcs/Set Remarks F00039W40KP INSTRUCTION MANUAL KTE,PTE F00039W40ZP INSTRUCTION MANUAL F01029W40SKT PACKING CASE,PAPER KTE,PTE F01029W40SZP PACKING CASE,PAPER F01049V00XP UPPER FILLER F01059V00XP LOWER FILLER F01068100XN P.E.BAG F01075G10XN DOOR SHEET... -
Page 33: Digital Programmer Circuit
NN-GT370M 11 DIGITAL PROGRAMMER CIRCUIT 11.1. SCHEMATIC DIAGRAM... - Page 34 NN-GT370M...
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Page 35: Parts List
NN-GT370M 11.2. PARTS LIST Ref. No. Part No. Part Name & Description Pcs/Set Remarks BZ210 L0DDEA000014 BUZZER 2.0KHz F2A1H221B549 AL CHEM CAPACITOR 220µF/50V C13,C16 F2A1C220B624 AL CHEM CAPACITOR 22µF/16V CX320 H2B800400007 CERAMIC RESONATOR 8.00MHz DISP110 L5AYAYY00070 F66179V30HP LCD HOLDER D220,D221,D225,D227-D229...