Panasonic NN-V659WB, Service Manual

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6.3 Digital Programmer Circuit (DPC) and
membrane key board.
NOTE: Be sure to ground any static electric charge built up on
your body before handling the DPC.
1. Disconnect all connectors from D.P.C.
2. Remove 2 screws holding escutcheon base and slide the
escutcheon base upward slightly.
3. Remove 1 screw holding earth wire to the chassis.
4. Release flat cable.
5. Remove 6 screws holding DPC DU.
6. Remove door lever.
7. Remove 6 screws holding DPC AU.
To replace membrane key board
8. Remove escutcheon bracket from escutcheon base by
freeing 4 catch hooks on the escutcheon base.
9. Remove display window.
10. Remove membrane assembly by pushing away from base.
NOTE:
1. The membrane key board is attached to the
escutcheon base with double faced adhesive tape.
Therefore, applying hot air such as using a hair dryer
is recommended for smoother removal.
2. When installing new membrane key board, make
sure that the surface of escutcheon base is cleaned
sufficiently so that any problems (shorted contacts or
uneven surface) can be avoided.
3. When replacing the silver escutcheon sheet (NN-
V629MB) ensure the escutcheon sheet is earthed to
the backplate via the earth strip.
6.4 Low voltage transformer and/or power
relays (RY1)
NOTE: Be sure to ground any static electric charge built
up on your body before handling the DPC.
1. Using solder wick or a desoldering tool and 30W soldering
iron, carefully remove all solder from the terminal pins of
the low voltage transformer and/or power relays.
NOTE: Do not use a soldering iron or desoldering tool of
more than 30 watts on DPC contacts.
2. With all the terminal pins cleaned and separated from DPC
contacts, remove the defective transformer/power relays
and install new transformer/power relays making sure all
terminal pins are inserted completely. Resolder all terminal
contacts carefully.
6.5 Fan Motor
1. Remove 2 screws and remove tie bar.
2. Disconnect 2 lead wires from fan motor terminals.
3. Disconnect all lead wires from noise filter.
4. Remove the noise filter.
5. Remove 4 screws holding fan motor and upper and lower
orifice. Detach the orifice assembly with fan motor from
oven assembly.
6. Remove fan blade from the fan motor shaft by pulling it
straight out.
MEMBRANE
KEY BOARD
ESCUTCHEON
BASE
NN-V689WB ONLY
ESCUTCHEON
SHEET
EARTH STRIP
NN-V629MB
NOISE FILTER
ORIFICE UPPER
FAN BLADE
ORIFICE LOWER
REMOVE 4 SCREWS
FAN MOTOR
01-024