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5-6

H. HIGH VOLTAGE TRANSFORMER 

REMOVAL

1) Discharge the high voltage capacitor.
2) Disconnect the leadwire from magnetron, and

capacitor.

3) Remove the screw holding the high voltage

transformer to the baseplate.

I. FAN MOTOR ASSEMBLY REMOVAL

1) Disconnect the leadwire from fan motor, noise filter.
2) Remove the one screw holding the the suction guide

ASSEMBLY to the oven cavity.

3) Remove the two screws holding the fan motor

ASSEMBLY to the suction guide ASSEMBLY.

J. HIGH VOLTAGE CAPACITOR AND

DIODE REMOVAL

1) Discharge the high voltage capacitor.
2) Disconnect the leadwire from high voltage capacitor.
3) Remove the screw holding the high voltage capacitor

bracket.

K. INTERLOCK SYSTEM

1) INTERLOCK MECHANISM

The door lock mechanism is a device which has
been specially designed to eliminate completely
microwave activity when the door is opened during
cooking and thus to prevent the danger resulting
from the microwave leakage.

2) MOUNTING OF THE PRIMARY/MONITOR/

SECONDARY SWITCHES TO THE LATCH
BOARD

3) INSTALLATION 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 while making this
adjustment. Make sure that the latch moves
smoothly after adjustment is completed and that the
screws are tight. Make sure the primary, monitor,
and secondary switches operate properly by
following the continuity test procedure.

PRIMARY
SWITCH

ADJUSTMENT
DIRECTION

MONITOR
SWITCH

SECONDARY
SWITCH

H.V.
Transformer

Suction
Guide

H.V.
Diode

H.V.
Capacitor

Fan Motor 
ASS'Y

Noise Filter

Содержание MA-6400B2

Страница 1: ...OWAVE OVEN SERVICE MANUAL MODEL MA 6400W2 MA 6400B2 CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL website http www lgservice com e mail http www lgeservice com techsup h...

Страница 2: ...ration 2 proper door closing 3 seal and sealing surfaces arcing wear and other damage 4 damage to or loosening of hinges and latches 5 evidence of dropping or abuse C Before turning on microwave power...

Страница 3: ...ING SEQUENCE 4 2 SCHEMATIC DIAGRAM 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 DISASSEM...

Страница 4: ...t Weight Shipping weight Control Complement Nameplate Location Accessories DESCRIPTION MA 6400W2 MA 6400B2 120 Volts AC 60 Hz 910 Watts 8 5A Single phase 3 wire grounded 600 Watts full microwave power...

Страница 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 in...

Страница 6: ...cal parts of the unit Do not install the oven next to a conventional surface unit or above a conventional wall oven 5 Use microwave oven in an ambient temperature less than 104 F 40 C 6 Place the micr...

Страница 7: ...the desired setting 2 The door can be opened during the cooking process by pushing the Door Open Button The timer will stop and the microwave activity will cease When the door is closed cooking will...

Страница 8: ...ER SWITCH H V TRANSFORMER H V CAPACITOR N AC 120V 60Hz IMPORTANT SAFETY NOTE THE COMPONENTS IN SHADED AREAS ON THIS SCHEMATIC DIAGRAM INCORPORATE SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM MICROWA...

Страница 9: ...pplied to the magnetron to heat the magnetron filament through two noise preventing choke coils A high voltage of approximately 2100 volts AC is generated in the secondary of the high voltage transfor...

Страница 10: ...ion leakage MEASURING MICROWAVE ENERGY LEAKAGE Pour 275 15cc of 20 5 C 68 9 F water in a beaker which is graduated to 600 cc and place the beaker on the center of the turntable Set the energy leakage...

Страница 11: ...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 read...

Страница 12: ...e ambient temperature is 5 K The microwave power output P in watts is calculated from the following formula 4187 x T T is measured while the microwave generator is operating at full power Magnetron fi...

Страница 13: ...lacing the door be sure to check that the primary switch monitor switch and secondary switch operate normally 2 After replacing the door check for microwave energy leakage with a survey meter Microwav...

Страница 14: ...to the magnetron To prevent microwave leakage tighten the mounting screws properly making sure there is no gap between the waveguide and the magnetron G REMOVING THE TURNTABLE MOTOR 1 Remove the turnt...

Страница 15: ...owave activity when the door is opened during cooking and thus to prevent the danger resulting from the microwave leakage 2 MOUNTING OF THE PRIMARY MONITOR SECONDARY SWITCHES TO THE LATCH BOARD 3 INST...

Страница 16: ...ould 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 t...

Страница 17: ...TS HIGH VOLTAGE TRANSFORMER Wire leads removed MAGNETRON Wire leads removed 1 Measure the resistance Ohm meter scale Rx1 and Rx100 Primary winding Secondary winding Filament winding 2 Measure the resi...

Страница 18: ...Terminal to case Measure the continuity Forward Ohm meter scale Rx10000 Measure the continuity Reverse Ohm meter scale Rx10000 Normal Momentarily indicates several ohms and then gradually returns to i...

Страница 19: ...8 sec 14 sec 4 10 sec 12 sec 5 12 sec 10 sec 6 14 sec 8 sec 7 16 sec 6 sec 8 18 sec 4 sec 9 20 sec 2 sec 10 22 sec 0 sec Normal A B Approx 65 80 ohm B C Approx 10 30 ohm A C Approx 85 105 ohm Abnormal...

Страница 20: ...ing many plugs into one outlet and using them at the same time blown fuse or breaker Microwave oven plug is not inserted tightly Output power is too low Low AC input voltage Food temperature is too lo...

Страница 21: ...ondary switches Check continuity of monitor switch with door closed Check continuity of primary switch with door opened Disconnect one side of the wire lead connected from transformer to the high volt...

Страница 22: ...able Minimum 8 5 C temperature rise is normal condition CONDITION CHECK RESULT CAUSE REMEDY Output is low Lower than 90 of rating voltage Normal Abnormal Measure the output power Defective magnetron R...

Страница 23: ...h voltage capacitor Normal Check high vol tage capacitor Abnormal Defective high voltage diode Replace high voltage diode Normal Check high vol tage diode Abnormal Defective magnetron Replace magnetro...

Страница 24: ...DOOR PARTS LATCH BOARD PARTS CONTROL PANEL PARTS INTERIOR PARTS BASE PLATE PARTS OVEN CAVITY PARTS 6 1 EXPLODED VIEW INTRODUCTION...

Страница 25: ...6 2 13552A 13213A 13581A 13720D 14970A 14026A 13536A 13352A DOOR PARTS...

Страница 26: ...6 3 24781T 23572A 24510L 250201 24970A 249401 26549T CONTROLLER PARTS...

Страница 27: ...6 4 33390G 35889A WSZ185 33112U WTP013 36549S 33052A 948502 WTT010 OVEN CAVITY PARTS WTT020...

Страница 28: ...6 5 466001 466003 WTT028 466001 43500A 56912B 55262A WSZ085 SUCTION GUIDE PARTS...

Страница 29: ...6 6 INTERIOR PARTS 568771 56930V 56411A 54974S 56549F WTT037 WTT028 WSZ002 55900A 56324A WSZ002 55006F 50FZZA...

Страница 30: ...6 7 56170D 63302A 63303A WTT021 WSZ002 948501 65006B 65006B 50CZZH WSZ002 54810C 56851D BASE PLATE PARTS...

Страница 31: ...Apr 2002 Printed in Korea P NO 3828W5S1905...

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