LG MB-339MB, Service Manual

Page: 15 / 38

F. MAGNETRON REMOVAL
1) Disconnect the leadwire from the magnetron.
2) Carefully remove the mounting screws holding the
magnetron and the waveguide.
3) Lift magnetron at a 30° angle to the waveguide with
the magnetron hanger unhooked.
4) Remove the magnetron assembly 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.
5-5
Magnetron
30
Waveguide
Magnetron
Gasket
Magnetron
Dome
Magnetron hanger
G. SUCTION GUIDE MAIN ASSEMBLY
NOTE: Suction Guide Main ASS’Y consists of Latch
Board ASS’Y and Suction Guide ASS’Y. To repair any of
them, the Suction Guide Main ASS’Y should be removed
first.
1) Disconnect the leadwire from the high voltage
transformer primary terminal, thermostat, fuse holder,
and turn table motor connector.
2) Remove three screws holding the Suction Guide Main
ASS’Y to oven cavity.
3) Rotate right and pull out Suction Guide Main ASS’Y
from the oven.
Screw
Remove magnetron
Wave guide and magnetron
Remove screw
Rotate right
and pull out
Pull out suction guide Main ASS’Y