Daewoo KOG-875T2S, Service Manual

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17
(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
interlock monitor switch
with door closed
(COM
↔ NC)
Check continuity of both
primary and secondary
interlock switch with door
closed
Check continuity of
primary winding of low
voltage transformer
Disconnect high voltage
fuse and operate the unit
Continuity
No
Continuity
Continuity
Continuity
0
Ω
or
infinite
Fuse again
blows
Approx.
150~210
(normal)
Replace
Replace
Replace
Replace
(COM
↔
NC)
Note 1.
Note 1.
(COM
↔
NC)
Malfunction of
interlock
monitor switch
No
Continuity
Malfunction of
interlock switch
Check continuity of
primary interlock switch
contact with door partially
open until interlock
monitor switch contact
close
(COM
NC close)
Replace
Note 1.
Shorted contacts
of primary interlock
switch.
Defective low
voltage transformer
Defective high
voltage transformer
Following the procedure below to check if the oven is defective or not.
1. Check earthing 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.