R-7280
R-1720
TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER
COMPONENT TEST
F MAGNETRON AND OVEN TEMP. FUSE TEST
A continuity check across the temp. fuse terminals should indicate a closed circuit unless the
temperature of the temp. fuse reaches approximately 145 “C.
An open magnetron temp. fuse indicates overheating of the magnetron assembly. if the temp.
fuse indicates a open circuit, replace the temp. fuse and check for restricted air flow to the
magnetron through the opening in the chassis, especially the air duct and fan motor.
An open oven temp. fuse indicate overheating of oven cavity.
If the oven temp.fuse indicates aopen circuit, replace the oven temp.fuse and check the reason
of the oven heating and check the wiring etc.
MONITOR SWITCH TEST
G
Before performing this test, make sure that the upper latch switch is operating properly referring
to the above Switch Test Procedure.
Disconnect the wire lead from the monitor switch (NC) terminal.
Check the monitor switch operation by using the ohmmeter as follows.
When the door is open, the meter should indicate a closed cirqit.
When the monitor switch actuater is pushed by a screw driver through the lower latch hole on
the 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.
If improper operation is indicated, the switch may be defective.
After testing the monitor switch, re-connect the wire lead to the monitor switch (NC) terminal
(RD82803U)
UPPER
LATCH
SWITCH
WHITE
&
BLUE
MONITOR
b
ry
NO
CO&l
OHMMETER
MONITOR
SWITCH
UPPER
LATCH
SWITCH
LOWER
LATCH
SWITCH
_-STOP
SWITCH
. SWITCH
LEVER
BLOWN OVEN FUSE
If the oven fuse in the upper latch switch-monitor switch circuit is blown when the door is
opened, check the upper latch switch and monitor switch before replacing the blown fuse.
If the oven fuse is blown by improper switch operation, replace the defective switch and oven
fuse at the same time.
Replace just the oven fuse if the switches operate normally.
CAUTION; REPLACEMENT FUSE MUST BE THE LISTED FUSE IN PARTS LIST.
12
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