LG MAB745W 01 Service Manual

LG MAB745W 01 Manual

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  • LG MAB745W 01 | Service Manual - Page 1
    Website http://us.lgservice.com MICROWAVE OVEN SERVICE MANUAL MODEL: MAB745W MAB745B CAUTION BEFORE SERVICING THE UNIT,READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : 3828W5S3839 May, 2004 Printed in Korea
  • LG MAB745W 01 | Service Manual - Page 2
    is to be serviced only by properly qualified service personnel. Consult the service manual for proper service procedures to assure on microwave power for any service test or inspection within the microwave generating compartments, check the magnetron, wave guide or transmission line, and cavity
  • LG MAB745W 01 | Service Manual - Page 3
    front cover SPECIFICATIONS 1-1 CAUTIONS 2-1 INSTALLATIONS 3-1 OPERATING INSTRUCTIONS 4-1 FEATURES 4-1 CONTROL PANEL 4-1 OPERATING SEQUENCE 4-2 SCHEMATIC DIAGRAM (I 4-3 SCHEMATIC DIAGRAM (II 4-4 CIRCUIT DESCRIPTION 4-5 SERVICE INFORMATION 5-1 TOOLS AND MEASURING INSTRUMENTS 5-1 MICROWAVE
  • LG MAB745W 01 | Service Manual - Page 4
    Cavity Dimensions Net Weight Shipping weight Control Complement Rating Label Location SPECIFICATIONS DESCRIPTION MAB745W / MAB745B approx. 20% 1 (Warm approx. 10% Back side Accessories Owner's manual & cooking guide Glass turntable Roller Rest This microwave oven is designed for household use
  • LG MAB745W 01 | Service Manual - Page 5
    . • NEVER put anything into the latch hole and the interlock switches area. FILAMENT TERMINALS COOLING FIN MAGNETRON CHASSIS GROUND MAGNETRON THE OVEN IS TO BE SERVICED ONLY BY PROPERLY QUALIFIED
  • LG MAB745W 01 | Service Manual - Page 6
    cm(4 inches) from the wall. 7. Place the microwave oven as far away as possible from TV, RADIO, COMPUTER, etc., to prevent interference. GROUNDING INSTRUCTIONS For personal safety,this appliance must be fully grounded at all times. In the event of an electrical short circuit, grounding reduces the
  • LG MAB745W 01 | Service Manual - Page 7
    OPERATING INSTRUCTIONS FEATURES Oven Front Plate Window Door Screen Door Seal Display Window Control Panel Safety Door Lock System Turntable Roller rest CONTROL PANEL 1 11 6 2 3 12 4 7 8 5 10 9 1.
  • LG MAB745W 01 | Service Manual - Page 8
    OPERATING SEQUENCE The following is a description of component functions during oven operation. 1. SETTING THE CLOCK STOP/CLEAR CLOCK NUMBER CLOCK ex.) To set 4:30,touch number key [4 ],[3 ], and [0 ]. NOTE: 1) This is a 12 hour clock. 2) Clock will operate as long as power is applied to the
  • LG MAB745W 01 | Service Manual - Page 9
    SCHEMATIC DIAGRAM (I) *Check the Rating Model No. 4-3
  • LG MAB745W 01 | Service Manual - Page 10
    SCHEMATIC DIAGRAM (II) *Check the Rating Model No. (ADD Noise filter) 4-4
  • LG MAB745W 01 | Service Manual - Page 11
    CIRCUIT DESCRIPTION GENERAL DETAILS • The low voltage transformer supplies the necessary voltage to the micom controller when power cord is plugged in. • When the door is closed, the primary switch is ON, the secondary switch is ON, and the monitor switch opens (contact COM and NO). WHEN SELECTING
  • LG MAB745W 01 | Service Manual - Page 12
    any unit found to have excessive emission levels at no cost to the owner and should ascertain the cause of the excessive leakage. The service personnel should instruct the owner not to use the unit until the oven has been brought into compliance. • If the oven operates with the door open, the
  • LG MAB745W 01 | Service Manual - Page 13
    the measured values for future reference. Also enter the information on the service invoice. • The microwave energy leakage should not be more than 4 condition, functioning properly and genuine replacement parts which are listed in this manual have been used. • At least once a year, have the
  • LG MAB745W 01 | Service Manual - Page 14
    . 5) Disconnect the leadwire from connector(CN1) of the PCB SUB ASS'Y. Lift up and pull out control panel CAUTION: DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE SERVICING (refer to page 2-1) 5-3
  • LG MAB745W 01 | Service Manual - Page 15
    1) Discharge the high voltage capacitor. 2) Disconnect the leadwire from fan motor, and high voltage capacitor. 3) Remove the two screws holding the the suction guide ASS'Y to the oven cavity and remove the high voltage diode earth screw. 4) Remove the two screws holding the fan motor ASS'Y to the
  • LG MAB745W 01 | Service Manual - Page 16
    H. AIR DUCT ASSEMBLY REMOVAL 1) Disconnect the leadwire from lamp. 2) Remove the mounting screw to Latch Board. I. MAGNETRON REMOVAL 1) Disconnect the leadwire from the high voltage transformer. 2) Carefully remove the mounting screws holding the magnetron to the waveguide. 3) Remove the magnetron
  • LG MAB745W 01 | Service Manual - Page 17
    K. PCB ASSEMBLY REMOVAL 1) Remove the control panel assembly from the cavity. (Refer to control panel assembly removal on previous page.) 2) Remove screws which hold the PCB SUB ASS'Y to the control panel. 3) Disconnect the flat cable from the PCB SUB ASS'Y and take off the PCB SUB ASS'Y. L.
  • LG MAB745W 01 | Service Manual - Page 18
    INTERLOCK CONTINUITY TEST WARNING : FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION EMISSION, REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS. 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
  • LG MAB745W 01 | Service Manual - Page 19
    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. (SEE
  • LG MAB745W 01 | Service Manual - Page 20
    COMPONENTS TEST PROCEDURE Antenna Gasket Chassis RESULTS HIGH VOLTAGE CAPACITOR 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. Measure the resistance. (Ohm-meter scale: Rx1000) •
  • LG MAB745W 01 | Service Manual - Page 21
    scale: R x 1000) Normal: Approx. 100 ~ 150 ohm Abnormal: Infinite or several ohm. 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
  • LG MAB745W 01 | Service Manual - Page 22
    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 not use metallic ware for cooking except where noted in the cooking guide. Do not use any type of cookware with metallic trimming. 1.
  • LG MAB745W 01 | Service Manual - Page 23
    PCB assembly. Replace key membrane assembly and check operation. RESULT Continuity. No continuity. Everything works as specified. Still have trouble. CAUSE Defective PCB assembly. Loose connection. Defective key membrane assembly. Defective PCB assembly. REMEDY Replace PCB assembly. Connect them
  • LG MAB745W 01 | Service Manual - Page 24
    (TROUBLE 2) Oven does not operate at all, Display window does not display any figures, and no input is accepted. CONDITION 1. Fuse blows. CHECK Check continuity of
  • LG MAB745W 01 | Service Manual - Page 25
    PCB assembly. Loose connection. Defective fan motor. Defective oven lamp. Replace PCB assembly. Connection then tightly. Replace fan motor. Defective oven lamp. (TROUBLE 4) Oven seems to be operation but little heat is produced in oven load. CONDITION Output is low. CHECK Check the power source
  • LG MAB745W 01 | Service Manual - Page 26
    (TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run. (Display operates properly) CONDITION No microwave oscillation. CHECK RESULT Disconnect the wire leads from
  • LG MAB745W 01 | Service Manual - Page 27
    #EV# INTRODUCTION EXPLODED VIEW OVEN CAVITY PARTS INTERIOR PARTS DOOR PARTS BASE PLATE PARTS LATCH BOARD PARTS CONTROL PANEL PARTS 6-1
  • LG MAB745W 01 | Service Manual - Page 28
    #EV# DOOR PARTS 13581A 13552A 13536A 13213A 13352A 13720D 14026A 14970A 6-2
  • LG MAB745W 01 | Service Manual - Page 29
    #EV# CONTROLLER PARTS 24781M 23506A 23572A 268711 WTT028 6-3
  • LG MAB745W 01 | Service Manual - Page 30
    #EV# OVEN CAVITY PARTS 33112U WSZ185 33052A 36549S WTP013 33390G 35889A For model WTT010 MAB745W WTT020 For model MAB745B 6-4
  • LG MAB745W 01 | Service Manual - Page 31
    #EV# LATCH BOARD PARTS 56912B 55262A 43500A 466001 466003 466001 WSZ085 6-5
  • LG MAB745W 01 | Service Manual - Page 32
    #EV# INTERIOR PARTS (I) Model: MAB745W MAB745B Check the rating label of Model and order SVC parts according to the Model No. * Check the Rating Model No. 568771 WSZ002 * Check the
  • LG MAB745W 01 | Service Manual - Page 33
    #EV# INTERIOR PARTS (II) Model: MAB745W / 01 MAB745B / 01 Check the rating label of Model and order SVC parts according to the Model No. * Check the Rating Model No. 568771 WSZ002 * Check the Rating
  • LG MAB745W 01 | Service Manual - Page 34
    #EV# BASE PLATE PARTS 63303A 63302A 56170D WTT021 65006B WSZ002 65006B 6-8
  • LG MAB745W 01 | Service Manual - Page 35
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MICROWAVE OVEN
SERVICE MANUAL
MODEL: MAB745W
MAB745B
CAUTION
BEFORE SERVICING THE UNIT,READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : 3828W5S3839
May, 2004
Printed in Korea