LG MS-72NA, Service Manual

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5-5
F. HIGH VOLTAGE TRANSFORMER
REMOVAL
1) Discharge the high voltage capacitor.
2) Disconnect the leadwire from magnetron, high voltage
transformer, and capacitor.
3) Remove the screw holding the high voltage
transformer to the baseplate.
G. FAN MOTOR ASSEMBLY REMOVAL
1) Discharge the high voltage capacitor.
2) Disconnect the leadwire from fan motor, and high
voltage capacitor.
3) Remove the two screws holding the the suction guide
ASS’Y to the oven cavity and remove the high voltage
diode earth screw.
4) Remove the two screws holding the fan motor ASS’Y
to the suction guide ASS’Y.
H. HIGH VOLTAGE CAPACITOR AND
DIODE REMOVAL
1) Discharge the high voltage capacitor.
2) Disconnect the leadwire from fan motor, and high
voltage capacitor.
3) Remove the screw holding the suction guide ASS’Y to
the oven cavity and remove the high voltage diode
earth screw.
4) Remove the screw holding the high voltage capacitor
bracket.
I. AIR DUCT ASSEMBLY REMOVAL
1) Disconnect the leadwire from lamp.
2) Remove the mounting screw to Latch Board.
J. MAGNETRON REMOVAL
1) Disconnect the leadwire from the high voltage
transformer.
2) Carefully remove the mounting screws holding the
magnetron to the waveguide.
3) 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.
Waveguide
Air Duct
Magnetron
Gasket
Magnetron
Dome
Waveguide
Bracket
Magnetron
H.V.
Transformer
Suction
Guide
H.V.
Diode
H.V.
Capacitor
Fan Motor
ASS'Y