Daewoo KOR-632G0S Service Manual page 21

TROUBLE SHOOTING GUIDE
( TROUBLE 3 ) No m icrowave oscillation even though fan m otor rotates.
C ON DITIO N
N o m icrow ave
oscillation
C HE C K
C heck continuity of high
voltage fu se
R epla ce high voltage fuse
C heck continuity of high
voltage capacito r
te rm inals w ith w ires
rem oved
C heck continuity of high
voltage rectifier in
fo rw ard and backw ard
direction w ith D C
m egge r
C onnect m egger leads to
m agne tron term ina l 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 sup plied to
R ELAY (R Y1) coil
R ES U LT
C AU S E
N o C ontinuity
C ontinuity
D efective
high voltage
transform er
C ontinuity in
D efective
backw ard
high voltage
direction
rectifier
C ontinuity
D efective
m agnetron


0 Ω
or
D efective
high voltage
transform er
N o
D efective
C ontinuity
m agnetron
N o
D efective
C ontinuity
high voltage
transform er
0 V
D efective
touch control
circuit
A pprox
Faulty
15 V D C
contacts or
R ELAY
(RY 1) or open
relay coil


R EM ED Y
R eplace
R eplace
R eplace
R eplace
R eplace
R eplace
R eplace
R eplace