Panasonic NN-J125MB EPG Service Manual Download Page 26 | Manualshive

Page: 26 / 43

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5-16

CONDITION

CHECK

RESULT

CAUSE

REMEDY

No microwave
oscillation.

No continuity.

Continuity.

Defective P.C.B
assembly

Replace P.C.B
assembly

Disconnect the
wire leads from
relay 2 and
check continuity
of relay2.
(Operate the
unit)

Abnormal

normal

Defective high
voltage
transformer.

Replace high
voltage
transformer .

Check H.V.
transformer.

normal

normal

Abnormal

Defective high
voltage Diode.

Replace high
voltage Diode.

Check H.V.
diode.

Abnormal

Defective high
voltage capacitor.

Replace high
voltage capacitor.

Check H.V.
capacitor.

Abnormal

Defective
magnetron.

Replace
magnetron .

Check
Magnetron.

(TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run

(Display operates properly)

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Summary of Contents for NN-J125MB EPG

Page 1: ...nt Power Output Microwave Frequency Magnetron Timer Outside Dimensions Cavity Dimensions Net Weight Shipping weight Specifications subject to change without notice 230 Volts AC 50 Hz Microwave 1100 Watts Grill 1000 Watts Combi 2050 Watts Single phase 3 wire grounded 800 Watts full microwave power IEC60705 2450 MHz 2M167B M47J1 0 90 min 455 W x 260 H x 325 D mm 315 W x 184 H x 294 D mm 11 5 kg appr...

Page 2: ...r and other damage 4 damage to or loosening of hinges and latches 5 evidence of dropping or abuse C Before turning on microwave power for any service test or inspection within the microwave generating compartments check the magnetron wave guide or transmission line and cavity for proper alignment integrity and connections D Any defective or misadjusted components in the interlock monitor door seal...

Page 3: ...AGRAM 4 3 CIRCUIT DESCRIPTION 4 4 SERVICE INFORMATION 5 1 TOOLS AND MEASURING INSTRUMENTS 5 1 MICROWAVE LEAKAGE TEST 5 1 MEASUREMENT OF MICROWAVE POWER OUTPUT 5 3 DISASSEMBLY AND ADJUSTMENT 5 3 INTERLOCK CONTINUITY TEST 5 7 COMPONENT TEST PROCEDURE 5 8 TROUBLE SHOOTING 5 12 EXPLODED VIEW 6 1 REPLACEMENT PARTS LIST 7 1 SCHEMATIC DIAGRAM OF P C B 8 1 PRINTED CIRCUIT BOARD 8 2 P C B PARTS LIST 9 1 ...

Page 4: ...Microwave Power for Variable Cooking Power level Max Full power throughout the cooking time MED HIGH approx 80 of Full power MEDIUM approx 60 of Full power DEFROST approx 40 of Full power LOW WARM approx 20 of Full power Owner s manual Glass turntable Roller Rest Grill rack ITEM Control Complement Rating Label Location Accessories Back Side ...

Page 5: ...ron be assembled to the waveguide and cavity Never operate the magnetron unless it is properly installed Be sure that the magnetron gasket is properly installed around the dome of the tube whenever installing the magnetron 2 1 CAUTIONS Unlike other appliances the microwave oven is high voltage and high current equipment Though it is free from danger in ordinary use extreme care should be taken dur...

Page 6: ...to prevent interference 8 Do not touch the front glass during or after cooking of the Grill and Combination mode This glass is very hot during heater operating 9 Do not operate the oven at microwave and combination mode with Grill rack placed in the cavity when the oven is empty EARTHING INSTRUCTIONS This microwave oven is designed to be used in a fully earthed condition It is imperative therefore...

Page 7: ...INDOW 2 AUTO COOK Used to cook the foods listed by one touch 3 AUTO DEFROST Used to select the auto weight defrost 4 POWER Used to select microwave power level for cooking grill and combi 5 STOP CLEAR Used to stop oven and clear all entries except time of day 6 START One tap allows oven to begin functioning 7 CLOCK Used to set the time of day 8 DIAL To select convection temperature change cooking ...

Page 8: ...tem entered or to the clock 3 MICROWAVE COOKING 4 GRILL COOKING 5 COMBI COOKING 6 MULTI STAGE MICROWAVE COOKING 1ST STAGE 2ND STAGE 7 AUTO DEFROST COOKING 8 CHILD LOCK This oven has a CHILD LOCK feature TO SET CHILD LOCK Touch the STOP pad Touch STOP CLEAR pad L appear on the display TO CANCEL CHILD LOCK Touch the STOP pad touch STOP CLEAR pad L disappears 9 AUTO COOK STOP CLOCK CLOCK NUMBER TIME ...

Page 9: ...SCHEMATIC DIAGRAM 4 3 1 3 5 7 8 ...

Page 10: ...4 000 Volts DC is applied to the filament of the magnetron WHEN THE OVEN IS SET AT ANY LEVEL EXCEPT MAXIMUM The micom controller controls the ON OFF time of relay 2 by the applied signal to vary the average output power of microwave oven as POWER LEVEL refer to page 1 1 WHEN THE DOOR IS OPENED DURING COOKING Both the primary switch and relay 2 are cut off primary winding voltage of the high voltag...

Page 11: ...ervicing The power density of the microwave radiation leakage emitted by the microwave oven should not exceed 5 mW cm2 Always start measuring of an unknown field to assure safety for operating personnel from radiation leakage NECESSARY MEASURING INSTRUMENTS TESTER VOLTS DC AC Ohmmeter Microwave survey meter Holaday HI 1500 HI 1501 Narda 8100 8200 Inch scale 600 cc non conductive material beaker gl...

Page 12: ...e test probe must be removed no faster than 1 inch sec 2 5 cm sec along the shaded area otherwise a false reading may result The test probe must be held with the grip portion of the handle A false reading may result if the operator s hand is befween the handle and the probe When testing near a corner of the door keep the probe perpendicular to the surface making sure the probe horizontally along t...

Page 13: ...d the empty vessel are at ambient temperature prior to the start of the test The initial temperature T1 of the water is 10 2 C It is measured immediately before the water is added to the vessel After addition of the water to the vessel the load is immediately placed on the center of the turntable which is in thd lowest position and the microwave power switched on The time T for the temperature of ...

Page 14: ...RMER REMOVAL 1 Discharge the high voltage capacitor 2 Disconnect the leadwire from magnetron high voltage transformer and capacitor 3 Remove the screw holding the high voltage transformer to the baseplate F FAN MOTOR ASSEMBLY REMOVAL 1 Discharge the high voltage capacitor 2 Disconnect the leadwire from fan motor noise filter and high voltage capacitor 3 Remove the two screws holding the the suctio...

Page 15: ...st be below the limit of 5 mW cm2 With a 275 ml water load Make sure that gasket is rigidly attached to the magnetron To prevent microwave leakage tighten the mounting screws properly making sure there is no gap between the waveguide and the magnetron J REMOVING THE TURNTABLE MOTOR 1 Remove the turntable 2 Remove the turntable shaft VERY CAREFULLY 3 Lay the unit down on its back 4 Remove the turnt...

Page 16: ...LATION AND ADJUSTMENT OF THE LATCH BOARD TO THE OVEN ASSEMBLY Mount the latch board to the oven assembly Adjust the latch board in the arrow direction so that oven door will not have any play in it when the door is closed Tighten the mounting screw Check for play in the door by pushing the door release button Door movement should be less than 0 5 mm 1 64 inch Don t push the door release button whi...

Page 17: ...er should indicate an closed circuit When the secondary switch operation is abnormal make the necessary adjustment or replace the switch only with the same type of switch C MONITOR SWITCH TEST Disconnect the wire lead from the monitor switch Connect the ohmmeter leads to the common COM and normally closed NC terminals of the switch The meter should indicate closed circuit in the door open conditio...

Page 18: ...OVEN HIGH VOLTAGE TRANSFORMER Wire leads removed MAGNETRON Wire leads removed Approx 1 4 ohm Approx 90 ohm Less than 1 ohm Normal Infinite Normal Infinite Normal Less than 1 ohm Normal Infinite PRIMARY TERMINAL SECONDARY WINDING FILAMENT WINDING TERMINAL COMPONENTS TEST PROCEDURE RESULTS 1 Measure the resistance Ohm meter scale Rx1 Primary winding Secondary winding Filament winding 2 Measure the r...

Page 19: ...ormal Momentarily indicates several ohms and then gradually returns to infinite Normal Infinite Normal Continuity Abnormal Infinite Normal Infinite Abnormal Continuity Measure the resistance Ohm meter scale Rx1000 Terminal to case Measure the continuity Forward Ohm meter scale Rx10000 Measure the continuity Reverse Ohm meter scale Rx10000 HIGH VOLTAGE DIODE NOTE Some inexpensive meters may indicat...

Page 20: ...ace the defective switch and the fuse at the same time Replace just the fuse if the switches operate normally Normal Abnormal Normal Abnormal H V FUSE HEATER ELEMENT Wire leads removed Measure the resistance Multi meter scale Rx1 Measure the resistance with 500V 100M ohm insulation resistance meter NOTE Make sure heater is fully cooled when tested Normal Grill heater Approx 38 ohm at 20 30 C GRILL...

Page 21: ... P C B connector Cooking Start OFF Cooking Start OFF Normal Abnormal or several Ω Normal Approx 100 200 Abnormal or several Ω Measure the resistance Ohm meter scale R x 1000 NOTE A MICROWAVE LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON MAKE SURE THE WIRE LEADS ARE IN THE CORRECT POSITION WHEN REMOVING THE WIRE LEADS FROM THE PARTS BE SURE TO GRASP THE CONNECTOR NO...

Page 22: ... does not work Inserting many plug into one plug outlet and using them at the same time causes overloading Microwave oven plug is not inserted tightly Output power is too low Low AC input voltage Food temperature is too low Using metallic ware and allowing it to touch the oven wall Sparks occurring Inconsistent intensity of microwave by their characteristics 1 Wrap the thinner part with aluminum f...

Page 23: ...isual conditions indicate a probable defective control circuit 1 Incomplete segments Segment missing Partial segment missing Digit flickering NOTE Slight flickering is normal 2 Colon does not turn on or blink 3 A distinct change in the brightness of one or more numbers in display 4 One or more digits in the display are not lighting 5 Display indicates a number different from one touched for exampl...

Page 24: ...nuity of magnetron thermostat No continuity 1 Fuse blows Continuity Malfunction of the monitor switch Replace primary and monitor switches Check continuity of monitor switch with door closed Check continuity of primary switch with door opened No continuity Disconnect one side of the wire lead connected from transformer to the high voltage capacitor and operate the unit No continuity Continuity Sho...

Page 25: ...Loose connection Connection then tightly Output is low Lower than 90 of rating voltage Normal Decrease in power source voltage with load Suggest customer contact local electric power utility co or qualified electrician Check the power source voltage Disconnect the wire leads from relay 2 and check on and off time with multitester Abnormal Normal Abnormal Defective magnetron Replace magnetron Defec...

Page 26: ... Defective high voltage transformer Replace high voltage transformer Check H V transformer normal normal Abnormal Defective high voltage Diode Replace high voltage Diode Check H V diode Abnormal Defective high voltage capacitor Replace high voltage capacitor Check H V capacitor Abnormal Defective magnetron Replace magnetron Check Magnetron TROUBLE 5 No microwave oscillation even though oven lamp a...

Page 27: ...y3 Grill Normal 1 Lower tempera ture the oven Abnormal Malfunction the heater Replace Heater Normal Abnormal Malfunction the thermostat Replace Thermostat and relay3 Grill No continuity Open or loosen Replace or connect tightly Wire connection TROUBLE 6 Oven does not cook properly when programmed for the set power level Operates properly on HIGH TROUBLE 7 Grill NOTE Make sure the wore leads correc...

Page 28: ...OVEN CAVITY PARTS INTERIOR PARTS BASE PLATE PARTS LATCH BOARD PARTS CONTROL PANEL PARTS DOOR PARTS 6 1 EXPLODED VIEW INTRODUCTION EV ...

Page 29: ...6 2 DOOR PARTS 13552A 13213A 13581A 13720D 14970A 14026A 13536A 14890A EV ...

Page 30: ...6 3 CONTROLLER PARTS 24781S 23572A 250203 24930D 23790D 268711 WTP004 WTT028 250202 249401 249402 268712 250201 24970A 24510L EV ...

Page 31: ...6 4 OVEN CAVITY PARTS 33390G 35026G 35889A WTT021 WTT021 33112U 34810H 34810H 44360A 35300A WNH001 WTP013 36549S 33052M WTT010 33808A 948503 368771 EV ...

Page 32: ...6 5 LATCH BOARD PARTS 56912B 948501 466001 466003 WSZ085 466001 43500A EV ...

Page 33: ...R PARTS WTT028 WTT037 50CZZH 54810C 948502 56851D 55900A 56549F 54974S WSZ002 WSZ002 WSZ002 568771 56930V 56411A WTT028 56324A WSZ062 50FZZA 56201A 56901A WSZ002 WTT028 55238A WTT021 WSZ002 56930G WSZ002 55262A EV ...

Page 34: ... 250202 5020W1A291B BUTTON 250203 5020W1A292C BUTTON 268711 6871W1A450B PWB PCB ASSEMBLY SUB 268712 6871W1A451B PWB PCB ASSEMBLY SUB 33052M 3052W1M014A CANOPY MICA 33112U 3112W0U084D OUT CASE U BENDING 33390G 3390W1A035A TRAY GLASS 33808A 3550W1A271A COVER BACK 34810H 4810W1A317A BRACKET HEATER 35026G 3750W2A003J SHELF 35300A 5300W1A004B HEATER MIRACLON 35889A 5889W1A012A ROTATING RING ASSEMBLY 36...

Page 35: ...6930W1A004B THERMOSTAT 63302A 3302W0A052C BASE PLATE 63303A 3303W1A067B BASE PLATE ASSEMBLY 65006B 5006W3A019A CAP BASE PLATE 948501 3B72244C CUSHION 948502 4850W1A002H CUSHION 948503 4850W1A001F CUSHION 948504 4850W1A002J CUSHION WNH001 1NHA0300018 NUT HEXAGON WSZ002 1SBF0402418 SCREW TAP TITE S BINDING HEAD WSZ062 4000W4A003A SCREW DRAWING WSZ085 4B70188C SCREW DRAWING WTP004 1TPL0302418 SCREW T...

Page 36: ...W1A451B PWB PCB ASSEMBLY SUB 33052M 3052W1M014A CANOPY MICA 33112U 3112W0U084D OUT CASE U BENDING 33390G 3390W1A035A TRAY GLASS 33808A 3550W1A271A COVER BACK 34810H 4810W1A317A BRACKET HEATER 35026G 3750W2A003J SHELF 35300A 5300W1A004B HEATER MIRACLON 35889A 5889W1A012A ROTATING RING ASSEMBLY 36549S 6549W1S011B MOTOR CIRC SYNCHRONOUS 368771 6877W1A424H HARNESS 43500A 3500W1A035A BOARD LATCH 44360A...

Page 37: ...3A019A CAP BASE PLATE 948501 3B72244C CUSHION 948502 4850W1A002H CUSHION 948503 4850W1A001F CUSHION 948504 4850W1A002J CUSHION WNH001 1NHA0300018 NUT HEXAGON WSZ002 1SBF0402418 SCREW TAP TITE S BINDING HEAD WSZ062 4000W4A003A SCREW DRAWING WSZ085 4B70188C SCREW DRAWING WTP004 1TPL0302418 SCREW TAPPING PAN HEAD WTP013 1TPL0402418 SCREW TAPPING PAN HEAD WTT010 1TTG0402422 SCREW TAPPING TRUSS HEAD WT...

Page 38: ...B PCB ASSEMBLY SUB 33052M 3052W1M014A CANOPY MICA 33112U 3112W0U084B OUT CASE U BENDING 33390G 3390W1A035A TRAY GLASS 33808A 3550W1A271A COVER BACK 34810H 4810W1A317A BRACKET HEATER 35026G 3750W2A003J SHELF 35300A 5300W1A004B HEATER MIRACLON 35889A 5889W1A012A ROTATING RING ASSEMBLY 36549S 6549W1S011B MOTOR CIRC SYNCHRONOUS 368771 6877W1A424H HARNESS 43500A 3500W1A035A BOARD LATCH 44360A 4360W1A00...

Page 39: ...PLATE 948501 3B72244C CUSHION 948502 4850W1A002H CUSHION 948503 4850W1A001F CUSHION 948504 4850W1A002J CUSHION WNH001 1NHA0300018 NUT HEXAGON WSZ002 1SBF0402418 SCREW TAP TITE S BINDING HEAD WSZ062 4000W4A003A SCREW DRAWING WSZ085 4B70188C SCREW DRAWING WTP004 1TPL0302418 SCREW TAPPING PAN HEAD WTP013 1TPL0402418 SCREW TAPPING PAN HEAD WTT010 1TTG0402422 SCREW TAPPING TRUSS HEAD WTT021 1TTL0402418...

Page 40: ...ASSEMBLY SUB 33052M 3052W1M014A CANOPY MICA 33112U 3112W0U084B OUT CASE U BENDING 33390G 3390W1A035A TRAY GLASS 33808A 3550W1A271A COVER BACK 34810H 4810W1A317A BRACKET HEATER 35026G 3750W2A003J SHELF 35300A 5300W1A004B HEATER MIRACLON 35889A 5889W1A012A ROTATING RING ASSEMBLY 36549S 6549W1S011B MOTOR CIRC SYNCHRONOUS 368771 6877W1A424H HARNESS 43500A 3500W1A035A BOARD LATCH 44360A 4360W1A006A ROD...

Page 41: ...PLATE 948501 3B72244C CUSHION 948502 4850W1A002H CUSHION 948503 4850W1A001F CUSHION 948504 4850W1A002J CUSHION WNH001 1NHA0300018 NUT HEXAGON WSZ002 1SBF0402418 SCREW TAP TITE S BINDING HEAD WSZ062 4000W4A003A SCREW DRAWING WSZ085 4B70188C SCREW DRAWING WTP004 1TPL0302418 SCREW TAPPING PAN HEAD WTP013 1TPL0402418 SCREW TAPPING PAN HEAD WTT010 1TTG0402422 SCREW TAPPING TRUSS HEAD WTT021 1TTL0402418...

Page 42: ...8 1 SCHEMATIC DIAGRAM OF P C B ...

Page 43: ...8 2 PRINTED CIRCUIT BOARD ...

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