Panasonic NN-T559WB, Service Manual

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Alternative way to troubleshooting oven with AC Ampare meter used.
Oven shuts down after approximately 15 or 33 seconds.
If the microwave oven shuts down after a short time in micropower mode, conduct the following test.
The microwave oven must be set in test mode to activate the self diagnostic failure code system.
SELF TEST MODE
When oven is set in test mode place water load in oven, set micropower to high and time to 1 minute, press start.
H97, H98 appears in display window a short time after start key is pressed and no microwave oscillation with AC Ampare meter used
for troubleshooting.
NEW H.V.
CLO CK
D ELAY/
STA N D
STA R T
H IG H POW ER
D ISPLAY
4N00B PQ
D ISPLAY
4N10B PQ
N N-T589W B
H97, H98 appears in the
Check oven input AC am-
Check magnetron filament
OK
more than 0.5A
refer to component
less than 0.4A
Open
DANGER
Magnetron*
DPC board/Power Delay
Loose wiring
Latch switch DO NOT try to REPAIR this Inverter Power Supply(U)
display window
pares measure at oven plug
continuity
test procedures
HIGH
VOLTAGE
and also DO NOT RE-ADJUST PRESET VOLUME
on the board. It is very dangerous to repair or adjust
without sufficient test equipment because this circuit
handles very high voltage and very large current. Off
alignment of inverter board operation is dangerous.
Operating a misaligned Inverter circuit is dangerous
due to the very high voltage and current that is
produced by this board. Defective boards must be
replaced with a new one.
NOTE:
NOTE: If filament is opened, it
STOP!!
If all the above is OK up
will flow AC input Ampare 0.5 - 1A
to this point, there may
be a H.V. Inverter problem
(SEE NOTE)
*Check magnetron filament for open or short to casing before
proceeding to determine a good magnetron.
DPC control signal