21
TROUBLE SHOOTING GUIDE
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 tranformer, disconnect one load 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.
(TROUBLE 1) Oven does not operate at all : any 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 connection of the terminals and power cord before check the parts listed below.
CONDITION
CHECK
Check continuity of interlock
monitor switch with door closed
(COM
↔
NC)
Check continuity of both
primary and secondary
interlock switch with door
closed
Malfunction of
interlock
monitor switch
Malfunction of
interlock switch
RESULT
Continuity
No Continuity
CAUSE
REMEDY
Replace
NOTE 1
Fuse blows.
Replace
NOTE 1
Shorted contacts
of primary
interlock switch.
Continuity
Replace
NOTE 1
Check continuity of primary
interlock switch contact with door
partially open until interlock
monitor switch contact close
(COM
↔
NC)
Defective low
voltage
transformer
0
Ω
or infinite
Approx.
1160
Ω
(normal)
Replace
Check continuity of primary
winding of low voltage
transformer
Defective high
voltage
transformer
Fuse again
blows
Replace
Disconnect high voltage fuse
and operate the unit
No Continuity
Continuity
