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6. Troubleshooting
6-1 Electrical Malfunction
NOTE : Interlock monitor switch must be replaced when the fuse is blown out.
Parts
Cause
Diagnosis
Remedy
Fuse blows
out when
door is
opened.
Defective primary
interlock switch
ary winding.
Check continuity of the primary switch terminals
with wire removed using a multimeter. If there is
continuity inter between switch terminals when door
is opened,the switch is defective.
Replace the primary
interlock switch
Defective interlock
monitor switch
Check continuity of the monitor switch terminals
with wire removed by using a multimeter.
If there is continuity between switch terminals
the
door is closed, the switch is defective.
Replace the interlock
monitor switch
Fuse is
Open
Layer short of the
secondary coil of
H. V. Transformer
The fuse will not blow right away, but if it blows in
a few seconds, then there is a layer short If the
fuse blows with H. V. Trans secondary open, the
transformer may be faulty.
Replace H. V.Transformer
Oven lamp
does not
light.
1) Fuse blown out
Check fuse.
Replace the fuse.
2) Poor contact of
power cord.
Check continuity of power supply cord. Also
check whether the power cord is securely wired.
Adjust or replace
the power supply cord
3) Defective lamp
The fan motor rotates, but lamp does not light.
Replace the lamp.
4) Defective timer
contacts
Check the terminals of timer for continuity,turning
the timer knob ON and OFF repeatedly.
Replace the timer.
5) Thermal cutout
S/W open
In this case the oven lamp and fan do not turn on
Replace the thermal
cutout S/W
Fan does
not operate.
1) Defective fan
motor.
If 230V is found at motor terminals, the motor
should be replaced.
Replace the motor.
2) Defective con-
tacts of timer
The oven lamp does not light and fan motor does
not operate.
Replace the timer.
WARNING FOR HIGH VOLTAGE
4000 VOLTS EXIST AT THE HIGH VOLTAGE AREA. DO NOT OPERATE THE OVEN WITH
CABINET PARTS REMOVED. DO NOT REMOVE THE CABINET PARTS IF THE POWER SUPPLY
CORD IS PLUGGED IN THE WALL OUTLET. UNPLUG THE POWER CORD BEFORE SERVICING.
