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R-9380
TEST PROCEDURES
(CONT'D)
PROCEDURE
LETTER
COMPONENT
TEST
F
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
115 "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.
G
MONITOR
SWITCH
TEST
Desconnect
oven from power supply
cord.
Before performing
this test, make sure that the upper
latch switch
and lower
latch switch
are operating
properly
referring
to the above Switch
Test
Procedure.
Disconnect
the wire lead from the upper latch switch
(NO) terminal.
Check the monitor
switch
operation
by using the ohmmeter
as follows.
When the door is open, the meter should
indicate
a closed circuit.
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 upper latch switch
(NO) termi-
nal.
POWER
TRANSFORMER
OHMMETER
MONITOR
SWITCH
H
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.
I
THERMAL
CUT-OUT
TEST
A continuity
check across the thermal
cut-out
terminals
should
indicate
a closed circuit.
If the
temperature
of the steam duct reaches approximately
115 "C the thermal cut-out
opens.
The termal cut-out
resets automatically
at below
-20 "C.
An open thermal
cut-out
indicates
overheating
of the oven cavity.
Check for restricted
air flow
to the magnetron
through
the opening
in the chassis, especially
the cooling
duct and fan.
CAUTION;
IF THE THERMAL
CUT-OUT
INDICATES
OPEN CIRCUIT,
REPLACE
THE THER-
MAL CUT-OUT.
12
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