5-5
H. AIR DUCT ASSEMBLY / REMOVAL
1) Disconnect the leadwire from lamp, A.C Relay and
monitor resistor and magnetron.
2) Remove the screw to the magnetron cavity.
I. MAGNETRON REMOVAL
1) Disconnect the leadwire from the high voltage
transformer and high voltage capacitor.
2) Remove the air duct ASS’Y.
3) Carefully remove the mounting screws holding the
magnetron and the waveguide.
4) Remove the magnetron ASS’Y until the tube is
clear from the waveguide.
NOTE:
1. When removing the magnetron, make sure its
dome does not hit any adjacent parts, or it may be
damaged.
2. When replacing the magnetron, be sure to install
the magnetron gasket in the correct position and
be sure that the gasket is in good condition.
3. After replacing the magnetron, check for microwave
leakage with a survey meter around the
magnetron. Microwave energy must be below the
limit of 5 mW/cm
2
. (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 turntable motor cover.
The turntable base cover is easily removed by
pinching the six parts with a wire cutting.
5) Disconnect the leadwire from the turntable motor
terminals.
6) Remove the screw securing the turntable motor to
the oven cavity ASS’Y.
7) After repairing the motor, rotate the removed
turntable motor cover.
8) Fit the turntable motor cover’s projecting part to the
base plate slit.
9) The taptite screw shall be used when a turntable
motor cover is secured with a screw.
NOTE:
1. Remove the wire lead from the turntable motor
VERY CAREFULLY.
2. Be sure to grasp the connector, not the wires, when
removing.
Magnetron
Waveguide
Magnetron
Gasket
Magnetron
Dome
Waveguide
Bracket
Wire Leads
Turntable Motor
Taptite Screw
LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Summary of Contents for MB3949G
Page 28: ... 6 2 13552A 13213A 13581A 13720D 14970A 14026A 13536A 14890A DOOR PARTS EV ...
Page 29: ... 6 3 23506A 23572A 24510L 250201 24970A 268711 WTT028 24781M CONTROL PANEL PARTS EV ...
Page 31: ... 6 5 466001 466003 WSZ085 466001 43500A 948503 56912B 55262A 43501A LATCH BOARD PARTS EV ...
Page 33: ... 6 7 56170D 63302A 63303A WTT021 WSZ002 65006B 65006B 948502 BASE PLATE PARTS EV ...
Page 34: ......