Panasonic NN-V659WB Service Manual page 21

SYMPTOMS
9 Turntable motor does not rotate.
10 Oven stops operation during cooking.
11 Oven returns to plug in mode 9 secs. after pad
is pressed in sensor mode.
Troubleshooting of Inverter Circuit (U) and Magnetron
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
DELAY/
CLOCK
STAND
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 there is no microwave oscillation.
H97, H98 appears in the
display window
Check magnetron filament
continuity
refer to component
OK
test procedures
Check Inverter input AC
voltages at CN702
unplug CN702 and measure
AC 240V
at lead wire harness side.
Check Inverter control signal
at CN701, pin 1 and 2
Approx AC 3V
unplug CN701 and measure
at lead wire harness side.
1. Open or loose wiring of turntable motor
2. Defective turntable motor
1. Open or loose wiring of primary and
secondary latch switch
1. Open steam sensor
2. Defective steam sensor
HIGH POW ER
START
DANGER
HIGH
VOLTAGE
Open
Magnetron*
DPC board/Power Relay
0V
Loose relay wiring
Latch switch
0V
DPC board
H.V. Inverter (U)
NOTE:
CAUSE
Adjust door and latch switches.
NN-V689WB
NEW H.V.
DISPLAY
DISPLAY
4N50BPQ
4N30BPQ
NN-V689W B
NOTE:
DO NOT try to REPAIR this Inverter Power Supply(U)
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.
*Check magnetron filament for open or short to casing before
proceeding to determine a good magnetron.
21
CORRECTIONS