LG MB-387W Service Manual page 15

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
2
limit of 5 mW/cm . (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.
Magnetron
Magnetron
Gasket
Waveguide
Bracket
Dome
Waveguide
Magnetron
Air Duct
5-5
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.
NOTE:
1. Remove the wire lead from the turntable motor
VERY CAREFULLY.
2. Be sure to grasp the connector, not the wires, when
removing.