Trouble Shooting Guide - Daewoo KOT-1G0S Service Manual

TROUBLE SHOOTING GUIDE

Following the procedure 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 check continuity with the AC plug removed. To do otherwise may result in a false reading or damage to your
meter.
5. Do not touch any part of the circuit on the touch control circuit since static electric discharge may damage this control
panel. Always touch yourself to ground while working on this panel to discharge any static charge built up in your body.
First of all, operate the microwave oven following the correct operation described in users guide manual (instruction man-
ual) by time cooking in order to find the exact cause of any trouble.
(TROUBLE 1) Oven does not operate at all; any input can not be accepted.
CONDITION
Fuse blows.
CHECK
Check continuity of
interlock monitor
switch with door
closed (COM NC)
Check continuity of
primary interlock
switch contact with
door partially open
until interlock moni-
tor switch contact
close (COM NC
close)
Check continuity of
primary winding of
low voltage trans-
former
Disconnect one
side of the lead
wire connected
from high voltage
to high voltage cap-
Fuse again blows
pacitor and operate
the unit
RESULT
continuity
Malfunction of
interlock monitor
switch
No Continuity
continuity
Malfunction of
interlock monitor
switch
0 or infinite
Shorted or open
winding
Approx.90~110
Normal
Defective low
voltage capacitor
Defective high
voltage capacitor
28
CAUSE REMEDY
Replace(NOTE1)
Replace(NOTE1)
Replace low
Voltge transformer
Replace
Replace