18
(TROUBLE 1) Oven does not operate at all ; any inputs can not be accepted.
TROUBLE SHOOTING GUIDE
Condition
Check
Result
Cause
Remedy
Fuse blows
Check continuity of inter-
lock monitor switch
with door closed
(COM NC)
Check continuity of pri-
mary interlock switch con-
tact with door partially
open until interlock moni-
tor switch contact close
Check continuity of
primary winding of low
voltage transformer
Disconnect high voltage
fuse and operate the unit
Continuity
Continuity
Continuity
No
Continuity
0
or
infinite
Fuse again
blows
Approx.
150~310
(normal)
Replace
Replace
Replace
Note 1.
Note 1.
Malfunction of
interlock
monitor switch
No
Continuity
Check continuity of pri-
mary interlock switch con-
tact with door partially
open until interlock moni-
tor switch contact close
(COM
NO)
Replace
Note 1.
Shorted contacts of
primary interlock
switch.
Shorted contacts
of primary interlock
switch
Defective low volt-
age transformer
Defective high
voltage transformer
Replace
Following the procedure below to check if the oven is defective or not.
1. Check grounding before trouble checking.
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 check continuity with the AC plug removed. To do otherwise may result in a false reading or damage to your meter.
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 the parts listed
below.
