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Trouble Shooting Guide
CAUTIONS
1. Check grounding before checking for other trouble.
2. Be careful of the high voltage circuit.
3. When checking the continuity of the switches or transformer, disconnect one lead wire from these parts and
then check continuity without turning the power source on.
4. Do not touch any part of the circuitry on the control circuit board, since static electric discharge may damage
this control circuit.
Always touch yourself to ground while working on this circuit to discharge any static charge built up in your
body.
5. First operate the microwave oven following the correct operating.
6. If the oven become inoperative because of a fuse, check the primary, the secondary and the monitor switches
before replacing the fuse.
(TROUBLE 1) Oven does not operate all.
CONDITION
The fuse blows when power
cord is plugged into wall
receptacle.
": 0" does not appear in
displasy window when
power cord is first plugged
into wall outlet.
Display does not operate
properly when CLOCK is
touched.
CAUSE
OFF CONDITION
Shorted lead wise assy or
wire hardness.
Defective monitor switch or
out of adjustment.
Microwave oven plug is not
inserted tightly.
No power at outlet.
Blown fuse.
Open wire in power cord,
wiring harness, or wiring
between control panel
assembly units.
Defective tact switch key of
P.C.B.
5-14
TEST PROCEDURE OR
CORRECTION
Replace lead wire or check
and repair wire hardness.
Test procedure switches.
Insert microwave oven plug
securely.
Check home fuse.
Test procedure fuse.
Replace or repair wiring.
Test procedure tact switch
key.
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