– 30 –
TROUBLESHOOTING
CONDITION
The fuse opens when power
cord is plugged into wall
receptacle.
Shorted wire in power cord or
wire harness.
OFF CONDITION
Defective monitor switch or out
of adjustment.
":0"does not appear in
display window when power
cord is first plugged into wall
outlet.
Microwave oven plug is not
inserted tightly.
No power at outlet.
Defective membrane key of
P.C.B.
Test procedure membrane key
of P.C.B. (See page 41.)
Display does not operate
properly when Clock is
touched.
Replace power cord or check
and repair wire harness.
Test procedure monitor switch.
(See page 25.)
Insert microwave oven plug
securely.
Check home fuse.
CAUSE
TEST PROCEDURE OR
CORRECTION
Open fuse.
Perform fuse test procedure
(See page 39.)
Open wire in power cord,
wiring harness, or wiring
between control panel
assembly units.
Replace or repair wiring.
CAUTION:
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 electrostatic 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 procedures.
6. If the oven becomes inoperative because of a fuse, check the primary, the secondary and the
monitor switches, before replacing the fuse.
