Panasonic NN-V653WF Service Manual page 29

SYMPTOM
1. Oven is dead.
Fuse is OK.
No display and no operation
at all.
2. No display and no operation
at all. / Fuse is blown.
3. Oven does not accept key
input(Program)
4. Fan motor turns on when
oven is plugged in with door
closed.
CAUSE
1. Open or loose lead wire harness
Open thermal cutout
2.
Open low voltage transformer
Defective DPC
3.
4.
1. Shorted lead wire harness
Defective primary latch switch
2. (NOTE 1)
3. Defective short switch (NOTE 1)
4. Defective Inverter Power Supply (U)
NOTE 1:
All of these switches must be replaced at the same time.
Check continuity of power relay B (RY-1)'s contacts (between 1
and if it has continuity, replace power relay B (RY-1) also.
1. Key input is not in sequence
Open or loose connection of
2. membrane key pad to DPC (Flat
cable)
3. Shorted or open membrane key
board
4. Defective DPC
1. Misadjustment or loose wiring of
secondary latch switch
2. Defective secondary latch switch
29
CORRECTIONS
Check fan motor if thermal
is defective.
Check adjustment of primary,
secondary latch switch and
switch including door.
Refer to operation procedure.
Refer to DPC troubleshooting.
Adjust door and latch switches.