22
Microwave service manual – Model:
microMD UK
(Trouble 5)
No microwave oscillation even though oven lamp and fan motor run
(Display operates properly)
(Trouble 6)
Oven does not cook properly when programmed for the set power level
(Operates properly on HIGH)
Condition
Condition
Check
Check
Result
Result
Cause
Cause
Remedy
Remedy
No microwave
oscillation.
Output is full when
you set lower power
level.
Check H.V.
transformer.
Check H.V.
capacitor.
Check H.V. diode.
Check magnetron.
Defective high
voltage transformer.
Defective high
voltage capacitor.
Defective high
voltage diode.
Defective
magnetron.
Replace high voltage
transformer.
Replace high voltage
capacitor.
Replace high voltage
diode.
Replace
magnetron.
No continuity.
Abnormal.
Normal.
Normal.
Normal.
Abnormal.
Abnormal.
Abnormal.
Abnormal.
Disconnect the wire
leads from relay 2
and check continuity
of relay 2.
(Operate the unit)
Disconnect the wire
leads from relay 2
and check continuity
relay 2.(Operate
the unit)
Continuity.
Defective P.C.B
assembly
Defective P.C.B
assembly
Replace P.C.B
assembly.
Replace P.C.B
assembly.
Note: * Make sure the wore leads correct position.
* When removing the wire leads from parts be sure to grasp
the connector not the wires.
* When removing the magnetron, be sure to install
magnetron gasket in the correct position and in good
condition.
