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8. TROUBLE SHOOTING GUIDE
Following the procedures below to check if the oven is defective or not.
1. Check grounding before checking trouble.
2. Be careful of the high voltage circuit.
3. Discharge the high voltage capacitor.
4. When checking the continuity of the switches, fuse or high voltage transformer, disconnect
one lead wire from these parts and then check continuity with the AC plug removed. To do
otherwise may result in a false reading or damage to your meter.
TROUBLE 1) Oven does not operate at all; inputs can not be accepted.
NOTE : When electric parts are checked, be sure the power cord is not inserted the wall outlet.
Check wire harness, wiring, and connected of the terminals and power cord before check parts
listed below.
CONDITION CHECK RESULT CAUSE REMEDY
Fuse blows
Check continuity of
interlock monitor switch
with door closed
( COM NC )
Continuity Malfunction
Of Interlock
monitor switch
Replace
Check continuity of
both primary and
secondary interlock
switch with door closed
No
Continuity
Malfunction
Of interlock
switch
Check continuity of
Primary winding of low
voltage transformer
Shorted contacts
of Primary
Interlock switch
Defective
Low voltage
transformer
Replace
Replace
Replace
No continuity
(COM
NC)
Check continuity of
primary interlock switch
contact with door partially
open until
interlock monitor
switch contact close
( COM NC close )
Replace
Defective
high voltage
transformer
Continuity
Continuity
0
-
or infinite
Approx.
530
( normal )
Disconnect high voltage
Fuse and operate the unit
Fuse again
blows
19


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