20
Microwave service manual – Model:
microMD UK
(Trouble 2)
Oven does not operate at all; display window does not display any figures and
no input is accepted.
Condition
Check
Result
Cause
Remedy
1. Fuse blows.
1. Fuse is not
tipping.
Check continuity
of primary switch
(with door opened).
Replace fuse
Disconnect one
side of the wire
lead connected
from transformer
to the high voltage
capacitor and
operate the unit.
Shorted contact at
the primary switch.
Defective high
voltage capacitor.
Defective high
voltage transformer.
Replace primary and
monitor switches.
Replace high voltage
capacitor.
Replace high
voltage transformer.
Continuity.
OK.
No continuity.
Fuse blows again.
Continuity.
Normal.
Check continuity
of monitor switch
(with door closed).
Check latch and
hook when door
closed.
No continuity.
Not OK.
Malfunction of the
monitor switch.
Main PCB defective.
Latch board back off.
Replace primary and
monitor switches.
Replace PCB.
Forward latch board.
Note: All these switches must be replaced at the same time. Refer to page
X
-
X
,
X
-
X
