Daewoo KOC-872T0S Service Manual page 19

Condition
Outlet has
proper voltage.
Fuse does not
blow.
NOTE1 : All these switches must be replaced at the same time, please refer to page 17 for adjustment instructions
(TROUBLE 2) Grill Heater (Top heater) does not heat (Food will not become hot).
Condition
Grill heater is
not heated
Check
Check
continuitymagnetron
Check continuity of
noise filter board
Check continuity of
power supply cord
Check
Check continuity of
primary interlock
switch
Check continuity of
secondary interlock
switch
Check continuity of
heater
Check D.C. voltage
being supplied to
RELAY (RY4) coil
Result
No Defective magnetron
Continuity
No Defective line filter
Continuity board
No
Open power supply
Continuity cord
Defective touch control
Normal
circuit
Result
No Malfunction of Primary
Continuity Interlock Switch
No Malfunction of
Continuity secondary interlock
switch
No
Defective heater
Continuity
Defective touch control
0V
circuit
Approx. Faulty contacts of
15VDC RELAY (RY1) or open
relay coil
19
Cause Remedy
Replace
Replace
Adjust.
Adjust.
Cause Remedy
Adjust or
replace
Adjust or
replace
Replace
Replace
Replace