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Microwave Oven Hood Combo Service Manual — LIT 4317216
Original 03/97
TEST CHARTS
TEST PROCEDURE RESULTCOMPONENT
1. Set the ohmmeter to the
R x 1
scale, and measure
the:
a) Primary winding.
b) Secondary winding.
c) Filament winding
2. Set the ohmmeter to its
R x 1000
scale, and mea-
sure the:
a) Primary to ground.
b) Filament to ground.
Magnetron (with wire leads un-
plugged). NOTE: A microwave
energy leakage test must always
be performed when the oven is
serviced for any reason.
1. Set the ohmmeter to the
R x 1
scale, and measure
the:
a) Filament terminal.
2. Set the ommeter to the
R x 1000
scale and mea-
sure the:
a) Filament winding to
chassis.
a) Normal readings - Less
than 1 Ω.
a) Normal = infinity.
High-Voltage Transformer (with
wire leads unplugged).
a) 0.3 to 0.5 ohms.
b) 65 to 120 ohms.
c) 0 ohms
a) Normal = infinity.
b) Normal = infinity.
NOTE: Replace the magnetron
if the checks and all of the high
voltage component tests are
good, but the unit still does not
heat a load.
COMPONENT TESTING
WARNING
ELECTRICAL SHOCK HAZARD
DISCONNECT THE POWER SUPPLY CORD
FROM THE WALL OUTLET WHEN REMOVING
THE CABINET FROM THE OVEN. PROCEED
WITH THE TESTS ONLY AFTER DISCHARG-
ING THE HIGH VOLTAGE CAPACITOR, AND
REMOVING THE WIRE LEADS FROM THE
PRIMARY WINDING OF THE HIGH VOLTAGE
TRANSFORMER.
FILAMENT
WINDING
SECONDARY
WINDINGS
HIGH VOLTAGE
TRANSFORMER