5-14
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.
CONDITION
The fuse blows when power
cord is plugged into wall
receptacle.
Shorted lead wise assy or
wire hardness.
Replace lead wire or check
and repair wire hardness.
CAUSE
OFF CONDITION
TEST PROCEDURE OR
CORRECTION
Defective monitor switch or
out of adjustment.
Test procedure switches.
": 0" does not appear in
displasy window when
power cord is first plugged
into wall outlet.
Microwave oven plug is not
inserted tightly.
Insert microwave oven plug
securely.
Display does not operate
properly when CLOCK is
touched.
Defective tact switch key of
P.C.B.
Test procedure tact switch
key.
No power at outlet. Check home fuse.
Blown fuse. Test procedure fuse.
Open wire in power cord,
wiring harness, or wiring
between control panel
assembly units.
Replace or repair wiring.
(TROUBLE 1) Oven does not operate all.
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