Panasonic NN-GT370M Service Manual Download Page 1 | Manualshive

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© Panasonic Home Appliances Microwave Oven
(Shanghai) Co., Ltd. 2010.

NN-GT370M

KTE (UAE)
PTE (Iran)
ZPE (CIS Countries)

Microwave Oven

ORDER NO.PHAMOS1012084C3

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Summary of Contents for NN-GT370M

Page 1: ... Panasonic Home Appliances Microwave Oven Shanghai Co Ltd 2010 NN GT370M KTE UAE PTE Iran ZPE CIS Countries Microwave Oven ORDER NO PHAMOS1012084C3 ...

Page 2: ...2 NN GT370M ...

Page 3: ...3 NN GT370M ...

Page 4: ...5 6 7 Quartz heater 15 6 8 H V Inverter Power Supply 16 7 COMPONENT TEST PROCEDURE 17 7 1 Primary Secondary Latch Switch interlocks Power Relay RY1 17 7 2 Short switch monitor 17 7 3 Magnetron 17 7 4 Inverter power supply U 18 7 5 Temperature thermistor 18 8 MEASUREMENTS AND ADJUSTMENTS 19 8 1 Adjustment of Primary latch switch Secondary latch switch and Short switch 19 8 2 Measurement of microwav...

Page 5: ...1 FEATURE CHART 2 CONTROL PANEL 5 NN GT370M ...

Page 6: ...3 SCHEMATIC DIAGRAM 3 1 NN GT370M KTE PTE 6 NN GT370M ...

Page 7: ...3 2 NN GT370M ZPE 7 NN GT370M ...

Page 8: ...ed back to the microcomputer in the DPC to determine operating conditions and output necessary to control PWM signal to the Inverter Power Supply for control of the output power 4 3 Turbo defrost Auto cook When the Auto Control feature is selected and the Start pad is tapped 1 The digital programer circuit determines the power level and cooking time to complete cooking and indicates the operating ...

Page 9: ...nnected to the aluminum heat sink The aluminum heat sink may be HOT due to heat energy therefore extreme care should be taken during servicing WARNING FOR INVERTER POWER SUPPLY U GROUNDING Check the high voltage inverter power supply circuit grounding The high voltage inverter power supply circuit board must have a proper chassis ground The inverter grounding bracket must be connected to the chass...

Page 10: ...he unit during operation Never insert a wire nail or any other metal object through the lamp holes on the cavity or any holes or gaps because such objects may work as an antenna and cause microwave leakage 5 6 Verification after repair 1 After repair or replacement of parts make sure that the screws of the oven etc are neither loose nor missing Microwave energy might leak if screws are not properl...

Page 11: ...ly making sure there is no gap between the waveguide and the magnetron to prevent microwave leakage CAUTION When replacing the magnetron be sure the antenna gasket is in place 6 2 Digital programmer circuit D P C Membrane switch NOTE Be sure to ground any static electric charge built up on your body before handling the D P C 1 Remove 1 screw holding escutcheon base on cavity front plate 2 Disconne...

Page 12: ...se is clean to prevent a malfunction or shorted contacts 6 3 Low voltage transformer and or power relays RY1 NOTE Be sure to ground any static electric charge built up on your body before handling the D P C 1 Disconnect all connectors from D P C board 2 Remove 5 screws holding D P C board on escutcheon base 3 Replace D P C board A Using solder wick or a desoldering tool and 30W soldering iron care...

Page 13: ...ng fan motor on orifice assy and detach the fan motor from orifice assy 6 5 Door assembly 1 Support the door remove 2 screws holding hinge A 2 Open the door remove door U and hinge A from cavity NOTE Support the door before opening 3 Remove door C from door A U door E by carefully pulling outward starting from upper right hand corner using a flat blade screwdriver 4 Separate door E from tabs on do...

Page 14: ...door s hinge A into the cavity slot Then lower your finger to seat the door onto the hinge NOTE Door alignment is crucial If door is misaligned apply pressure until alignment is achieved NOTE Adjust so that the upper portion of the door will touch firmly to the oven cavity front plate without pushing the door If the door assembly is not mounted properly microwave power may leak from the clearance ...

Page 15: ...le motor by removing 1 screw NOTE After reinstalling the new turntable motor and reconnecting the 2 lead wires reinstall the motor cover by rotating it around 180 tucking the 2 tabs under the base into the 2 provided slots then screw the single tab to the base using a 4mm x 6mm screw 6 7 Quartz heater 1 Disconnect lead wires from both side of heater terminals 2 Bend back 2 locking tabs on heater m...

Page 16: ...nector CN701 CN702 from H V Inverter board 3 Remove 1 screw holding grounding plate on the base 4 Remove 1 screw holding inverter bracket on the base 5 Slide 2 locking tabs of inverter bracket at the bottom of the base in direction of arrows 6 Remove 2 screws holding H V inverter on the inverter bracket 16 NN GT370M ...

Page 17: ...oor Opened Primary Latch Switch 0Ω Close Ω Open Secondary Latch Switch 0Ω Close Ω Open Power Relay RY1 Ω Open Ω Open 7 2 Short switch monitor 1 Unplug lead wires from Inverter Power Supply U primary terminals 2 Connect test probes of ohm meter to the disconnected leads which were connected to Inverter Power Supply U 3 Test the continuity of short switch with door opened and closed positions using ...

Page 18: ... Plug in the oven s AC power supply cord into outlet 4 Program DPC a Press Timer Clock pad once b Press Start pad once c Press Micro Power pad once 5 Program oven at High power for 1 minute and press Start pad 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 afte...

Page 19: ...in by following the component test procedures 8 2 Measurement of microwave output The output power of the magnetron can be determined by performing IEC standard test procedures However due to the complexity of IEC test procedures it is recommended to test the magnetron using the simple method outlined below Necessary Equipment 1 liter beaker Glass thermometer Wrist watch or stopwatch NOTE Check th...

Page 20: ...may damage this control panel Always touch ground while working on this panel to discharge any static charge in your body 7 220V AC is present on the digital programmer circuit Terminals of power relay s and primary circuit of Digital Programmer Circuit When troubleshooting be cautious of possible electrical shock hazard Before troubleshooting operate the microwave oven following the correct opera...

Page 21: ...ecially magnetron filament circuit NOTE Large contact resistance will cause lower magnetron filament voltage and cause magnetron to have lower output and or be intermittent 3 Defective high voltage component H V Inverter Power Supply U Magnetron Check high voltage component according to component test procedure and replace if it is defective 4 Open or loose wiring of power relay RY1 5 Defective pr...

Page 22: ...97 H98 and H99 First you must program the DPC into TEST MODE press Timer Clock pad twice Press Start pad once press Micro Power pad once Program unit for operation H95 H97 H98 H99 appears in display window a short time after Start pad is pressed and there is no microwave oscillation Alternate way to troubleshoot oven with AC Ampere meter used H95 H97 H98 H99 appears in display window a short time ...

Page 23: ...l 3 3V Step2 2 Collector of Q220 voltage Abnormal Q220 and or Q221 Q222 Q225 Q227 Normal 0 7V Step3 3 Short circuit between collector and emitter of Q220 Still not turn on RY1 RY1 turns on Q220 and or Q221 Q222 Q225 Q227 Dark or unclear display 1 Replace display and check operation Normal Display Abnormal IC1 Missing or lighting of unnecessary segment 1 Replace IC1 and check operation Normal IC1 A...

Page 24: ...procedure Power will Ammeter reading is To do Remedy Shut off in 23 seconds after Start 1 Between 0 5A and 1 0A Check and repair open magnetron circuit CN703 Open magnetron wiring between Inverter and magnetron terminal 2 Between 1 0A and 2 0A Check continuity of D702 in Inverter PCB 1 D702 shorted Replace H V Inverter F606YM300BP 2 D702 is OK Replace magnetron Shut off in 3 seconds after Start 1 ...

Page 25: ...702 ECQE2505T869 FILM CAPACITOR 1 C703 ECWF2395N632 FILM CAPACITOR 1 DB701 B0FBBQ000007 RECTIFIER BRIDGE 1 L701 F5020M300XN CHOKE COIL 1 R702 D0CM352JA002 SAND BAR RESISTOR 1 T701 A609A7F40QP TRANSFORMER 1 INCLUDING D701 D702 C706 C707 D701 D702 B0FBAZ000002 DIODE 2 C706 F0C3F562A002 FILM CAPACITOR 1 5600PF 3KV C707 F0C3F432A002 FILM CAPACITOR 1 4300PF 3KV 25 NN GT370M ...

Page 26: ...10 EXPLODED VIEW AND PARTS LIST 10 1 EXPLODED VIEW 26 NN GT370M ...

Page 27: ... SWITCH 20 F61415U30XN MICRO SWITCH A 1 SECONDARY LATCH SWITCH 21 F61789V00XP SHORT SWITCH 1 SHORT SWITCH 22 2M236 M36R MAGNETRON 1 27 F62309W40HP FUSE 1 10A 28 F62319V00XP FUSE HOLDER 1 KTE PTE 29 F63266S30XP TURNTABLE MOTOR 1 30 F900C9V20HP AC CORD W PLUG 1 KTE 30 F900C9V20ZP AC CORD W PLUG 1 PTE ZPE 31 F61456N60AP THERMAL CUTOUT 1 150 C OPEN 20 C CLOSE 33 F67359W00XP HEATER PROTECTOR 1 36 F630G...

Page 28: ...Ref No Part No Part Name Description Pcs Set Remarks 70 F692Y9W40ZP NOISE FILTER U 1 ZPE 71 F02395E20KN CORD CAUTION LABEL 1 KTE PTE 28 NN GT370M ...

Page 29: ...Part No Part Name Description Pcs Set Remarks D1 F30189V00XP DOOR KEY A 1 D2 F302A9V00KXP DOOR A U 1 D3 F302K9V00XP DOOR E U 1 D4 F30215G10XN DOOR KEY SPRING 1 D5 F30859V00XP DOOR C 1 D6 F31459W00XP DOOR SCREEN A 1 29 NN GT370M ...

Page 30: ...s Set Remarks E1 F603L9W40PT D P CIRCUIT AU 1 KTE PTE E1 F603L9W40ZP D P CIRCUIT AU 1 ZPE E2 F630Y9W40KKT MEMBRANE SWITCH 1 KTE PTE E2 F630Y9W40KZP MEMBRANE SWITCH 1 ZPE E3 F80349V30SHP ESCUTCHEON BASE 1 E5 F81279V30AP BACK PLATE 1 E6 F66139V30HP BACKSTOP 1 30 NN GT370M ...

Page 31: ...10 5 WIRING MATERIALS Ref No Part No Part Name Description Pcs Set Remarks W1 F030A9W40HP LEAD WIRE HARNESS 1 KTE PTE W1 F030A9W40ZP LEAD WIRE HARNESS 1 ZPE W2 F030E7K10XP H V LEAD WIRE 1 31 NN GT370M ...

Page 32: ...029W40SKT PACKING CASE PAPER 1 KTE PTE P2 F01029W40SZP PACKING CASE PAPER 1 ZPE P3 F01049V00XP UPPER FILLER 1 P4 F01059V00XP LOWER FILLER 1 P5 F01068100XN P E BAG 1 P6 F01075G10XN DOOR SHEET 1 P7 F06019W00XP COOKING TRAY 1 P8 F01924T00AP SHEET 1 P9 F01085G50XN RACK PACKING 1 P10 F060V8H00BP OVEN RACK 1 P12 F04459W40SKT OVERLAY 1 KTE PTE P16 F01099V20HP FOAM 1 32 NN GT370M ...

Page 33: ...11 DIGITAL PROGRAMMER CIRCUIT 11 1 SCHEMATIC DIAGRAM 33 NN GT370M ...

Page 34: ...34 NN GT370M ...

Page 35: ...0 LCD 1 F66179V30HP LCD HOLDER 1 D220 D221 D225 D227 D229 B0AACK000004 DIODE 6 D10 D13 B0EAKT000025 DIODE 4 D25 D4EAY511A036 ZENER RESISTOR 1 510V KTE PTE D26 D27 D4EAY112A036 ZENER RESISTOR 2 1100V KTE PTE IC1 MN101C78ABK1 L S I 1 IC350 C0EBE0000401 IC 1 Q10 B1BAAJ000003 TRANSISTOR 1 RY1 RY3 AEBGJQC25F18 POWER RELAY 2 ZD10 B0BA01000049 ZENER DIODE 1 ZD11 B0BA4R400002 ZENER DIODE 1 T10 G4C3AAH0000...

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