Daewoo KOR-137B Service Manual page 18

CONDITION
Outlet has
proper
voltage Fuse
does not
blow.
NOTE 1
All these switches must be replaced at the same time, please refer to "Interlock Mechanism And Adjustment".
(TROUBLE 2) Display shows all figures selected, but oven does not start cooking, even though desired program and
time are set and the START pad is touched.
CONDITION
Turn table
motor and
oven lamp
do not turn
on
CHECK
Check continuity of magnetron
Check continuity of
power supply cord
Display do not shown
countdown
CHECK
Check continuity of primary
interlock switch
Check continuity of secondary
interlock and D.O.M switch
Check D.C. voltage being
supplied to RELAY (RY2) coil
RESULT
No
Continuity
No
Continuity
Normal
RESULT
No
Continuity
No
Continuity
0 V
Approx.
15 VDC
17
CAUSE
Defective
magnetron
Open power
supply cord
Defective touch
control circuit
Malfunction of
secondary
interlock switch
CAUSE
Malfunction of
primary interlock
switch
Malfunction of
secondary
interlock
switch
Defective touch
control circuit
Faulty contacts of
RELAY (RY2) or
open relay coil
REMEDY
Replace
Replace
Replace
Replace
REMEDY
Adjust or
replace
Adjust or
replace
Replace
Replace