Panasonic NN-F623MF, Service Manual

Page: 29 / 52

SYMPTOM CAUSE CORRECTIONS
1. Oven is dead. 1.
2.
3.
4.
Open or loose lead wire harness
Open thermal cutout
Open low voltage transformer
Defective DPC
Check fan motor if thermal
is defective.
Fuse is OK.
No display and no operation
at all.
2. No display and no operation
at all. / Fuse is blown.
1.
2.
Shorted lead wire harness
Defective primary latch switch
(NOTE 1)
Check adjustment of primary,
secondary latch switch and
switch including door.
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.
3. Oven does not accept key
input(Program)
1.
2.
Key input is not in sequence
Open or loose connection of
membrane key pad to DPC (Flat
cable)
Refer to operation procedure.
3. Shorted or open membrane key
board
4. Defective DPC Refer to DPC troubleshooting.
4. Fan motor turns on when
oven is plugged in with door
closed.
1. Misadjustment or loose wiring of
secondary latch switch
Adjust door and latch switches.
2. Defective secondary latch switch
29