LG MH-794GS, Service Manual

Page: 14 / 39

MEASUREMENT WITH THE OUTER
CASE REMOVED
❥
When you replace the magnetron, measure microwave
energy leakage before the out case is installed and
after all necessary components are replaced or adjust-
ed.
Special care should be taken in measuring the
following parts. (Shaded area of below Fig.)
— Around the magnetron
— The waveguide
MEASUREMENT WITH A FULLY
ASSEMBLED OVEN
❥
After all components, including the outer case, are fully
assembled, measure for microwave energy
leakage around the door viewing window, the exhaust
opening and air inlet openings.
❥
Microwave energy leakage must not exceed the
values prescribed below.
NOTES:
Leakage with the outer case removed - less than
5 mW/cm
2 .
Leakage for a fully assembled oven (“Before the latch
switch (primary) is interrupted”) with the door in a
slightly opened position - less than 4 mW/cm
2 .
NOTES WHEN MEASURING
❥
Do not exceed meter full scale deflection.
❥
The test probe must be removed no faster than,
1 inch/sec (2.5 cm/sec) along the shaded area,
otherwise a false reading may result.
❥
The test probe must be held with the grip portion of the
handle.
A false reading may result if the operator’s hand is
between the handle and the probe.
❥
When testing near a corner of the door, keep the
probe perpendicular to the surface making sure the
probe horizontally along the oven surface, this may
possibly cause probe damage.
RECORD KEEPING AND NOTIFICA-
TION AFTER MEASUREMENT
❥
After adjustment and repair of any microwave energy
interruption or microwave energy blocking
device, record the measured values for future
reference. Also enter the information on the service
invoice.
❥
Should the microwave energy leakage not be more
than 4 mW/cm2 after determining that all parts are in
good condition, functioning properly and genuine
replacement parts which are listed in this manual have
been used.
❥
At least once a year, have the electromagnetic energy
leakage monitor checked for calibration by its
manufacture.
14
WARNING: AVOID CONTACTING ANY
HIGH VOLTAGE PARTS