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6. Troubleshooting
PRECAUTION
1.
CHECK GROUNDING BEFORE CHECKING FOR TROUBLE.
2.
BE CAREFUL OF THE HIGH VOLTAGE CIRCUIT .
3.
DISCHARGE THE HIGH VOLTAGE CAPACITOR .
4.
WHEN CHECKING THE CONTINUITY OF THE SWITCHES OR TRANSFORMER, DISCONNECT ONE
LEAD WIRE FROM THESE PARTS AND THEN CHECK CONTINUITY WITHOUT THE POWER SOURCE
ON . TO DO OTHERWISE MAY RESULT IN A FALSE READING OR DAMAGE TO YOUR METER .
5.
DO NOT TOUCH ANY PART OF THE CIRCUIT OR THE CONTROL CIRCUIT BOARD, SINCE STATIC
DISCHARGE MAY DAMAGE IT. ALWAYS TOUCH GROUND WHILE WORKING ON IT TO DISCHARGE
ANY STATIC CHARGE BUILT UP .
6-1 Electrical Malfunction
Parts
Cause
Diagnosis
Remedy
Fuse blows
out when
door is
opened .
Defective primary
interlock switch
are 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 in terlock
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 .
