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INSTALLATIONS

3-1

INSTALLING

1. Empty the microwave oven and clean inside it with

a soft, damp cloth. Check for damage such as
misaligned door, damage around the door or dents
inside the cavity or on the exterior.

2. Put the oven on a counter, table, or shelf that is

strong enough to hold the oven and the food and
utensils you put in it. (The control panel side of the
oven is the heavy side. Use care when handling.)

3. Do not block the vent and the air intake openings.

Blocking vent or air intake openings can cause
damage to the oven and poor cooking results.
Make sure the microwave oven legs are in place to
ensure proper air flow.

4. The oven should not be installed in any area where

heat and steam are generated, because they may
damage the electronic or mechanical 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 microwave  oven on a sturdy and flat

surface at least 10 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 risk of electrical shock.
The plug must be plugged into an outlet that is
properly installed and grounded.

BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY.

10cm

WARNING

Improper use of the grounding plug can result in a
risk of electric shock.
Do  not,  under  any  circumstances,  cut  or  remove
the third ground prong from the power cord plug.

PREFERRED METHOD

ENSURE PROPER GROUND 

EXISTS BEFORE USE

Summary of Contents for MA-6400B2

Page 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...

Page 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...

Page 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...

Page 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...

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 in...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

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

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

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

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

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

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

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

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

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