Daewoo KOR-164H0A Service Manual page 20

( TROUBLE 3 ) No microwave oscillation even though fan motor rotates.
CON DITION
N o m icrowave
oscillation
CHECK
C heck continuity of high
voltage capacitor
term inals w ith w ires
rem oved
C heck continuity of high
voltage rectifier in
forw ard and backw ard
direction with D C
m egge r
C onnect m egger leads to
m agne tron term inal and
m agne tron body
C heck resistance of
prim ary and secondary
coil of high voltage
transfo rm er
C heck continuity of
m agne tron w ith w ires
rem oved
C heck continuity of
filam ent term inal of high
voltage transform er
C heck D .C. voltage
being supplied to
R ELAY (R Y1) coil
RESULT
Continuity
Defective
high voltage
transform er
Continuity in
Defective
backw ard
high voltage
direction
Continuity
Defective
magnetron
or
Defective
high voltage
transform er
No
Defective
Continuity
magnetron
No
Defective
Continuity
high voltage
transform er
0 V
Defective
touch control
Approx
15 VDC
contacts of
(RY1) or open
19
CAUSE REM EDY
Replace
Replace
rectifier
Replace
Replace
Replace
Replace
Replace
circuit
Replace
Faulty
RELAY
relay coil