Panasonic NN-CS596S, Service Manual

Page: 12 / 35

4.2. Digital programmer circuit
(D.P.C) AU, (D.P.C.) HU,
membrane key board and
power relay
NOTE:
Be sure to ground any static electric charge built up on
your body before handling the DPC.
1. Draw out water tank from escutcheon base.
2. Keep pressing [Steam] pad for more than 2 seconds to
drain the water remaining in the water pipes and tubes into
oven cavity forcibly.
3. Pull out tube A connecting to pump from copper pipe.
4. Remove wiring connectors CN3, CN4, CN8, CN9 and all
connectors connecting to power relays from D.P.C. board
HU.
5. Remove wiring connector CN2 from D.P.C. board DU.
6. Remove 1 screw holding escutcheon base on cavity front
plate.
7. Open the door of oven, slide the escutcheon base upward
and out slightly.
8. Remove connector CN6 connecting pump-LED (U) from
D.P.C. board HU.
9. Remove 2 flat cables connecting between D.P.C. board HU
and AU from connectors CN5 & CN15 on D.P.C. board HU
by pulling upward slightly.
10. Remove 2 screws holding D.P.C. board HU on escutcheon
base, then remove D.P.C. board HU.
11. Remove 2 screws holding D.P.C. board AU (big one) on
escutcheon base.
12. Release locking tabs holding D.P.C. board AU (big one) on
escutcheon base then remove 5 screws holding D.P.C.
board AU (small one) on backstop to remove D.P.C. board
AU.
To replace membrane key board
13. Use tools such as kinfe etc. to poke from the edge of
escutcheon sheet and peel off escutcheon sheet and
membrane key board completely from escutcheon 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.
4.3. Digital programmer circuit
(D.P.C.) DU and low voltage
transformer
1. Remove connectors CN1 & CN2 from D.P.C. board DU.
2. Remove 1 screw holding D.P.C. board DU on reinforce
bracket A.
3. Use tools such as pincers to reject the tab of plastic
bracket.
4. Remove D.P.C. board DU.
5. Using solder wick or a desoldering tool and 30W soldering
iron carefully to 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 D.P.C. contacts.
6. With all the terminal pins cleaned and separated from
D.P.C. contacts, remove the defective transformer/power
relays. Replace components making sure all terminal pins
are inserted completely, then resolder all terminal contacts
carefully.
12
NN-CS596S