View LG MB-4322A Service Manual online
SAFETY PRECAUTIONS IN THIS MANUAL.
blow fuse during operation under abnormal condition.
(ie, should the contacts of primary and secondary
switch fail to open the circuit)
AND COOKING TIME SET
(While power control knob is set at “Full Power”)
the solid line.
• The fan motor rotates and cools the magnetron by
baseplate) over the magnetron.
• 3.2 volts AC is generated from the filament winding of
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
transformer which is increased by the action of the
diode and charging of the high voltage capacitor.
The negative DC voltage is then applied to the filament
of the magnetron.
transformer to stop microwave oscillation.
• As the door is opened, if the contact of primary switch
surge caused by the monitor switch activation which in
turn stops magnetron, oscillation.
• Input volts AC is applied to the grill heater through
certified oven unit found to have a microwave
emission level in excess of 5 mW/cm
at no cost to the owner and should ascertain the cause
of the excessive leakage. The service personnel
should instruct the owner not to use the unit until the
oven has been brought into compliance.
- Contact the manufacturer.
emitted by the microwave oven should not exceed
on the center of the turntable.
test procedure to assure correct result.
• Measure the microwave radiation using and
probe perpendicular to the surface being measured
Less than 2.5 cm/sec
Standard tools are listed below.
• Long nose pliers
• Phillips screwdriver
• Flat blade screwdriver
• Wrench (size 5mm)
• Nutdriver (size 5mm)
• Adjustable wrench
• Soldering iron
• Vinyl insulation tape
• Polishing cloth
• Microwave survey meter
• 600 cc non conductive material beaker (glass or plastic),
outside diameter: approx. 190mm
height: approx. 90mm
installed and after all necessary components are
replaced or adjusted.
- The waveguide
around the door viewing window, the exhaust opening,
and air inlet openings.
oven (Before the latch switch (primary) is
interrupted) with the door in a slightly opened
position-less than 2 mW/cm.sq.
• The test probe must be removed no faster than
otherwise a false reading may result.
horizontally along the oven surface, this may possibly
cause probe damage.
record the measured values for future reference. Also
enter the information on the service invoice.
good condition, functioning properly and genuine
replacement parts which are listed in this manual have
H.V. Capacitor, H.V. Cable Ass’y,
H.V. Circuit Protector)