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Panasonic NN-J155WB EPG Service Manual
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Panasonic NN-J155WB EPG Service Manual

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Specifications
Power Requirement
Power Output
Microwave Frequency
Magnetron
Timer
Outside Dimensions
Cavity Dimensions
Net Weight
Shipping weight
230 Volts AC 50 Hz
Microwave
Grill
Combi
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 (approx.)
12.5 kg (approx.)
Specifications subject to change without notice.
NN-J155WB EPG
NN-J125MB EPG
NN-J155WB WPG
NN-J125MB WPG
1100 Watts
1000 Watts
2050 Watts
© 2005 Matsushita Electric (UK)Ltd.
All rights reserved. Unauthorized copying and
distribution is a violation of law.
P/NO : 3828W5S5183

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Summary of Contents for Panasonic NN-J155WB EPG

  • Page 1 NN-J155WB EPG NN-J125MB EPG NN-J155WB WPG NN-J125MB WPG Specifications Power Requirement 230 Volts AC 50 Hz Microwave 1100 Watts Grill 1000 Watts Combi 2050 Watts Single phase, 3 wire grounded Power Output 800 Watts full microwave power (IEC60705) Microwave Frequency...

  • Page 2: Safety Precautions

    SAFETY PRECAUTIONS This device is to be serviced only by properly qualified service personnel. Consult the service manual for proper service procedures to assure continued safety operation and for precautions to be taken to avoid possible exposure to excessive microwave energy. PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY...

  • Page 3: Table Of Contents

    CONTENTS (Page) SAFETY PRECAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Inside front cover SPECIFICATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-1 CAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-1 INSTALLATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-1...
  • Page 4 POWER LEVEL & ACCESSORIES ITEM DESCRIPTION Control Complement 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 Rating Label Location Back Side Accessories Owner's manual...

  • Page 5: Cautions

    CAUTIONS Unlike other appliances, the microwave oven is MICROWAVE RADIATION high-voltage and high-current equipment. Personnel should not be exposed to the Though it is free from danger in ordinary use, microwave energy which may radiate from the extreme care should be taken during repair. magnetron or other microwave generating device if it is improperly used or connection.

  • Page 6: Installations

    INSTALLATIONS BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY. INSTALLING EARTHING INSTRUCTIONS 1. Empty the microwave oven and clean inside it with This microwave oven is designed to be used in a fully a soft, damp cloth. Check for damage such as earthed condition.

  • Page 7: Operating Instructions

    OPERATING INSTRUCTIONS FEATURES Oven Front Plate Window Door Screen Door Seal Control Panel Safety Door Lock System Turntable Grill rack Roller Rest CONTROL PANEL 1. DISPLAY WINDOW. NN-J155WB NN-J125MB 2. AUTO COOK: Used to cook the foods listed by one touch. 3.

  • Page 8: Operating Sequence

    OPERATING SEQUENCE The following is a description of component functions 6. MULTI-STAGE MICROWAVE COOKING during oven operation. 1ST STAGE 1. SETTING THE CLOCK STOP POWER TIME START STOP CLOCK NUMBER CLOCK 2ND STAGE NOTE: 1) This is a 24 hour clock. 2) Clock will operate as long as power is STOP POWER...

  • Page 9: Schematic Diagram

    SCHEMATIC DIAGRAM...

  • Page 10: Circuit Description

    CIRCUIT DESCRIPTION power of microwave oven as POWER LEVEL. GENERAL DETAILS (refer to page 1-1) • The low voltage transformer supplies the necessary voltage to the micom controller when power cord is WHEN THE DOOR IS OPENED DURING plugged in. COOKING •...

  • Page 11: Service Information

    SERVICE INFORMATION TOOLS AND MEASURING INSTRUMENTS NECESSARY TOOLS NECESSARY MEASURING INSTRUMENTS Tools normally used for TV servicing are sufficient. • TESTER (VOLTS-DC, AC., Ohmmeter) • Microwave survey meter Standard tools are listed below. - Holaday HI-1500 • Diagonal pliers HI-1501 •...
  • Page 12 MEASUREMENT WITH OUTER CASE NOTES WHEN MEASURING REMOVED • Do not exceed meter full scale deflection. • The test probe must be removed no faster than • When you replace the magnetron, measure for 1 inch/sec (2.5 cm/sec) along the shaded area, microwave energy leakage before the outer case is otherwise a false reading may result.

  • Page 13: Measurement Of Microwave Power Output

    MEASUREMENT OF MICROWAVE POWER OUTPUT • Microwave power output measurement is made with • The microwave power output P in watts is calculated the microwave oven supplied at its rated voltage and from the following formula : operated at its maximum microwave power setting with 4187 x (∆T) + 0.55 X (T ) X M a load of (1000±5) g of potable water.
  • Page 14 D. DOOR GROSS ASSEMBLY REMOVAL E. HIGH VOLTAGE TRANSFORMER REMOVAL 1) Open the door. 2) Pull out the door protector very carefully with a flat- 1) Discharge the high voltage capacitor. blade screwdriver. 2) Disconnect the leadwire from magnetron, high voltage CAUTION : Be careful not to damage door seal plate transformer, and capacitor.
  • Page 15 H. AIR DUCT ASSEMBLY REMOVAL J. REMOVING THE TURNTABLE MOTOR 1) Disconnect the leadwire from lamp, A.C Relay and 1) Remove the turntable. monitor resistor and magnetron. 2) Remove the turntable shaft VERY CAREFULLY. 2) Remove the screw to the magnetron cavity. 3) Lay the unit down on its back.
  • Page 16 K. PCB ASSEMBLY REMOVAL L. INTERLOCK SYSTEM 1) Remove the control panel assembly from the 1) INTERLOCK MECHANISM cavity. (Refer to control panel assembly removal The door lock mechanism is a device which has on previous page.) been specially designed to eliminate completely 2) Remove screws which hold the PCB SUB ASS’Y to microwave activity when the door is opened during the control panel.
  • Page 17 MEASUREMENT OF MICROWAVE POWER OUTPUT WARNING : FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION EMISSION, REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS. ALL THESE SWITCHES MUST BE REPLACED AT THE SAME TIME. TYPE NO.SZM-V 16-FA-63 OR VP-533A-OF FOR PRIMARY SWITCH TYPE NO.SZM-V 16-FA-62 OR VP-532A-OF FOR MONITOR SWITCH TYPE NO.SZM-V 16-FA-63 OR VP-533A-OF FOR SECONDARY SWITCH A.

  • Page 18: Component Test Procedure

    COMPONENT TEST PROCEDURE CAUTIONS 1. DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE OUTER CASE FROM THE UNIT. PROCEED WITH THE TEST ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER.
  • Page 19 COMPONENTS TEST PROCEDURE RESULTS Antenna Gasket Chassis Filament NOTE: When testing the magnetron, be sure to install the magnetron gasket in the correct position and be sure that the gasket is in good condition. HIGH VOLTAGE Measure the resistance. Normal: Momentarily indicates CAPACITOR (Ohm-meter scale: Rx1000) several ohms, and then...
  • Page 20 COMPONENTS TEST PROCEDURE RESULTS FUSE Check for continuity of the fuse with an Normal Abnormal multi-meter. NOTE: If the fuse is blown, check the primary, the secondary, and the monitor switches, H.V.D. and H.V.C. before replacing the fuse. If the fuse is blown by improper switch operation replace the defective switch and the fuse at the same time.
  • Page 21 COMPONENTS TEST PROCEDURE RESULTS Cooking Start Disconnect the 8 pin Check for P.C.B.connector. connector from P.C.B. (Refer to schemetic diagram) Cooking Start RELAY 2, RELAY 3 Relay 3 OF P.C.B. (Wire leads removed.) Note: Relay Relay 1 Relay 1: Fan motor Turntable motor Oven lamp Relay 2: Microwave...

  • Page 22: Trouble Shooting

    TROUBLE SHOOTING WHEN YOU GET A COMPLAINT FROM YOUR CUSTOMER, EVALUATE THE COMPLAINT CAREFULLY. IF THE FOLLOWING SYMPTOMS APPLY, PLEASE INSTRUCT THE CUSTOMER IN THE PROPER USE OF THE MICROWAVE OVEN. THIS CAN ELIMINATE AN UNNECESSARY SERVICE CALL. CAUTIONS 1. Check grounding before checking for trouble. 2.
  • Page 23 (TROUBLE 1) The following visual 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.
  • Page 24 (TROUBLE 2) Oven does not operate at all ; Display window does not display any figures and no input is accepted. CONDITION CHECK RESULT CAUSE REMEDY Malfunction of the Replace primary Check continuity 1. Fuse blows. Continuity. monitor switch. and monitor of monitor switches.
  • Page 25 (TROUBLE 3) Display shows all figures set, but oven does not start cooking while desired program times are set and START pad is touched. CONDITION CHECK RESULT CAUSE REMEDY Defective Replace Check continuity 1.Setting time does No continuity. secondary switch. secondary switch.
  • Page 26 (TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run (Display operates properly) CONDITION CHECK RESULT CAUSE REMEDY Defective P.C.B No microwave Disconnect the Replace P.C.B No continuity. oscillation. wire leads from assembly assembly relay 2 and check continuity Continuity.
  • Page 27 (TROUBLE 6) Oven does not cook properly when programmed for the set power level (Operates properly on HIGH) CONDITION CHECK RESULT CAUSE REMEDY Defective P.C.B. Replace P.C.B. Output is full when Disconnect the Abnormal. assembly. assembly. you set lower wire leads from power level.

  • Page 28: Exploded View

    #EV# EXPLODED VIEW INTRODUCTION OVEN CAVITY PARTS INTERIOR PARTS BASE PLATE PARTS DOOR PARTS LATCH BOARD PARTS CONTROL PANEL PARTS...
  • Page 29 #EV# DOOR PARTS 13581A 13552A 13536A 13213A 14890A 13720D 14026A 14970A...
  • Page 30 #EV# CONTROLLER PARTS 24781S WTP004 268711 250203 23572A WTT028 268712 24930D 23790D 249402 250202 249401 24510L 24970A 250201...
  • Page 31 #EV# OVEN CAVITY PARTS WNH001 WTT021 WTT021 33112U 34810H 33808A 34810H 44360A 33052M 948503 WTT010 35300A 35026G 368771 33390G 35889A 36549S WTP013...
  • Page 32 #EV# LATCH BOARD PARTS 56912B 43500A 948501 466001 466003 466001 WSZ085...
  • Page 33 #EV# INTERIOR PARTS WSZ062 568771 56411A 56930G 56930V WSZ002 50FZZA 56201A WTT028 56549F WTT028 WSZ002 WTT037 55900A 54974S WTT021 56851D 55238A WSZ002 WSZ002 50CZZH 56324A 948502 54810C 56901A WTT028 55262A...

  • Page 34: Replacement Parts List

    REPLACEMENT PARTS LIST For Model : NN-J125MB EPG Location No. Part Name Description Alternate Remarks 3828W5A8264 MANUAL,OWNERS 3828W5S5183 MANUAL,SERVICE 3890W3W559M BOX,WHITE 13213A 3213W1A053C DOOR FRAME ASSEMBLY 3213W1A053E 13536A 3536W1A010A SEAL TAPE 13552A 3552W1A064A CHOKE COVER 13581A 3581W1A518D DOOR ASSEMBLY 13720D 3720W1D117B PANEL,DOOR 14026A...
  • Page 35 REPLACEMENT PARTS LIST For Model : NN-J125MB EPG Location No. Part Name Description Alternate Remarks 56324A 6324W1A009A MAGNETRON 56411A 6411W2A004K POWER CORD ASSEMBLY 56549F 6549W1F005A MOTOR(CIRC),FAN 56851D 6851W1A002A CABLE ASSEMBLY 6021W3B001T 568771 6877W1A555C HARNESS 56901A 6901W1A001A FUSE ASSEMBLY 56912B 6912W3B002D LAMP,DRAWING 56930G 6930WRT001E...
  • Page 36 REPLACEMENT PARTS LIST For Model : NN-J125MB WPG Location No. Part Name Description Alternate Remarks 3828W5A8264 MANUAL,OWNERS 3828W5S5183 MANUAL,SERVICE 3890W3W559N BOX,WHITE 13213A 3213W1A053C DOOR FRAME ASSEMBLY 3213W1A053E 13536A 3536W1A010A SEAL TAPE 13552A 3552W1A064A CHOKE COVER 13581A 3581W1A518D DOOR ASSEMBLY 13720D 3720W1D117B PANEL,DOOR 14026A...
  • Page 37 REPLACEMENT PARTS LIST For Model : NN-J125MB WPG Location No. Part Name Description Alternate Remarks 56912B 6912W3B002D LAMP,DRAWING 56930G 6930WRT001E THERMOSTAT 56930V 6930W3A001C THERMOSTAT 56930V 6930W1A003B THERMOSTAT 56930V 6930W1A004B THERMOSTAT 63302A 3302W0A052C BASE PLATE 63303A 3303W1A067B BASE PLATE ASSEMBLY 65006B 5006W3A019A CAP,BASE PLATE 948501...
  • Page 38 REPLACEMENT PARTS LIST For Model : NN-J155MB EPG Location No. Part Name Description Alternate Remarks 3828W5A8263 MANUAL,OWNERS 3828W5S5183 MANUAL,SERVICE 3890W3W559K BOX,WHITE 13213A 3213W1A053C DOOR FRAME ASSEMBLY 3213W1A053E 13536A 3536W1A010A SEAL TAPE 13552A 3552W1A064A CHOKE COVER 13581A 3581W1A518C DOOR ASSEMBLY 13720D 3720W1D117A PANEL,DOOR 14026A...
  • Page 39 REPLACEMENT PARTS LIST For Model : NN-J155MB EPG Location No. Part Name Description Alternate Remarks 56930G 6930WRT001E THERMOSTAT 56930V 6930W3A001C THERMOSTAT 56930V 6930W1A003B THERMOSTAT 56930V 6930W1A004B THERMOSTAT 63302A 3302W0A052C BASE PLATE 63303A 3303W1A067B BASE PLATE ASSEMBLY 65006B 5006W3A019A CAP,BASE PLATE 948501 3B72244C CUSHION...
  • Page 40 REPLACEMENT PARTS LIST For Model : NN-J155MB WPG Location No. Part Name Description Alternate Remarks 3828W5A8264 MANUAL,OWNERS 3828W5S5183 MANUAL,SERVICE 3890W3W559L BOX,WHITE 13213A 3213W1A053C DOOR FRAME ASSEMBLY 3213W1A053E 13536A 3536W1A010A SEAL TAPE 13552A 3552W1A064A CHOKE COVER 13581A 3581W1A518C DOOR ASSEMBLY 13720D 3720W1D117A PANEL,DOOR 14026A...
  • Page 41 REPLACEMENT PARTS LIST For Model : NN-J155MB WPG Location No. Part Name Description Alternate Remarks 56930G 6930WRT001E THERMOSTAT 56930V 6930W3A001C THERMOSTAT 56930V 6930W1A003B THERMOSTAT 56930V 6930W1A004B THERMOSTAT 63302A 3302W0A052C BASE PLATE 63303A 3303W1A067B BASE PLATE ASSEMBLY 65006B 5006W3A019A CAP,BASE PLATE 948501 3B72244C CUSHION...

  • Page 42: Schematic Diagram Of P.c.b

    SCHEMATIC DIAGRAM OF P.C.B...

  • Page 43: Printed Circuit Board

    PRINTED CIRCUIT BOARD...

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