LG MB-387W Service Manual - Page 26

CONDITION, CHECK, RESULT, CAUSE, REMEDY, TROUBLE 5, No microwave oscillation even though oven lamp

Get LG MB-387W PDF manuals and user guides View all LG MB-387W manuals
Add to My Manuals
Save this manual to your list of manuals

Page 26 highlights

(TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run (Display operates properly) CONDITION No microwave oscillation. CHECK Disconnect the wire leads from relay 2 and check continuity of relay2. (Operate the unit) RESULT No continuity. Continuity. CAUSE Defective P.C.B assembly REMEDY Replace P.C.B assembly Check H.V. transformer. Abnormal normal Defective high voltage transformer. Replace high voltage transformer . Check H.V. capacitor. Abnormal normal Defective high voltage capacitor. Replace high voltage capacitor. Check H.V. diode. Check Magnetron. Abnormal normal Abnormal Defective high voltage Diode. Replace high voltage Diode. Defective magnetron. Replace magnetron . 5-16

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
5-16
CONDITION
CHECK
RESULT
CAUSE
REMEDY
No microwave
oscillation.
No continuity.
Continuity.
Defective P.C.B
assembly
Replace P.C.B
assembly
Disconnect the
wire leads from
relay 2 and
check continuity
of relay2.
(Operate the
unit)
Abnormal
normal
Defective high
voltage
transformer.
Replace high
voltage
transformer .
Check H.V.
transformer.
normal
normal
Abnormal
Defective high
voltage Diode.
Replace high
voltage Diode.
Check H.V.
diode.
Abnormal
Defective high
voltage capacitor.
Replace high
voltage capacitor.
Check H.V.
capacitor.
Abnormal
Defective
magnetron.
Replace
magnetron .
Check
Magnetron.
(TROUBLE 5)
No microwave oscillation even though oven lamp and fan motor run
(Display operates properly)