Disassembly And Parts Replacement Procedure - Panasonic NE-C1153 Service Manual

CAUTION
MICROWAVE RADIATION
Personnel should not be exposed to the microwave energy which may
radiate from the magnetron or other microwave generating device if it
is improperly used or connected. All input and output microwave
connections waveguides, flanges, and gasket must be secure. Never
operate the device without a microwave energy absorbing load
attached. Never look into an open waveguide or antenna while the
device is energized.
8 DISASSEMBLY AND PARTS REPLACEMENT
PROCEDURE
8.1. Magnetron (Front and Back)
1. Discharge the high voltage capacitors.
2. Remove 5 screws holding air guides.
3. Disconnect magnetron, lead wire connectors and grounding
lead.
4. Loosen wire harness and lift up air guide.
5. Remove 4 screws holding each magnetron.
6. Remove 2 screws holding thermal cutout.
NOTE:
To prevent microwave leakage, tighten mounting
screws making sure there is no gap between the
waveguide and the magnetron.
CAUTION
When replacing the magnetron, be sure the antenna gasket is in
place.
8.2. Digital programmer circuit
(DPC)
1. Remove 1 screw holding grounding strip tab of membrane
switch.
2. Remove 2 screws holding escutcheon base and slide the
escutcheon base upward slightly with door opened.
3. Disconnect all connectors from DPC.
4. Remove 2 screws holding DPC.
To replace membrane key board
1. Bend escutcheon A catch hooks straighten and separate
escutcheon A and base.
2. Remove smoke panel.
3. Push the upper part of key board (display window) from
back of escutcheon base and peel off membrane key
board.
NOTE 1:
The membrane key board is attached to the escutcheon
base with double faced adhesive tape. Therefore,
applying hot air from A hair dryer is recommended for
smoother removal.
NOTE 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.
NOTE 3:
Alignment position of membrane key board is as
follows (see figure);
Membrane key board: Right and lower edges
High voltage parts may become uncovered when outer cabinet is
removed.
8.3. Low voltage transformer
and/or power relays
NOTE:
Be sure to ground any static electric charge built up on
your body before handling the DPC.
NOTE:
Do not use a soldering iron or desoldering tool of more
than 30 watts on DPC contacts.
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.
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.
17
NE-C1153 / NE-C1153C
CAUTION