Sharp R-8320E, Service Manual, Page: 57 / 140

TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER
COMPONENT TEST
D HIGH VOLTAGE CAPACITOR TEST
THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY
OVEN COMPONENTS OR WIRING.
If the capacitor is open, no high voltage will be available to the magnetron. Disconnect input leads
and check for short or open between the terminals using an ohmmeter.
Checking with a high ohm scale, if the high voltage capacitor is normal, the meter will indicate
continuity for a short time and should indicate an open circuit once the capacitor is charged. If the
above is not the case, check the capacitor with the ohmmeter to see if it is short circuited between
the terminals. If it is short circuited, replace the capacitor.
E
UPPER LATCH SWITCH TEST
F
The upper latch switch can be checked with an ohmmeter. Isolate the switch and then connect the
meter leads to the common (COM) and normally open (NO) terminals of the switch. The meter
should indicate an open circuit with the door opened and a closed circuit with the door closed,
In case improper operation is indicated, make the necessary switch adjustment or replacement.
LOWER LATCH SWITCH
Isolate the switch and connect the ohmmeter leads to the common and normally open (NO)
terminals of the switch. The meter should indicate an open circuit with the door opened and a
closed circuit with the door closed.
the meter leads connected to the common and
normally closed (NC) terminals of the switch, it should indicate a closed circuit with the door
opened and an open circuit with the door closed.
In case improper operation is indicated, make the necessary switch adjustment or replacement.
MONITOR SWITCH TEST
(Australia Model)
Before performing this test, make sure that the upper latch switch is operating properly referring the
Test Procedure “E”. Connect one ohmmeter lead to one of the fuse terminals, and the other lead to
the power transformer terminal to which the white wire from the wiring harness is connected,
When the door is open, the meter should indicate a closed circuit.
When the monitor switch lever of the upper latch hook is pushed by the screw-driver through
the upper latch hole on front plate of the oven cavity with the door opened (in this condition
the plunger of the monitor switch is pushed in), the meter should indicate an open circuit.
In case improper operation is indicated, replace the defective switch.
POWER TRANSFORMER
OHMMETER
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