Panasonic NN-G55 AR, Руководство по обслуживанию

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NN-G55 AR
DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE
• Magnetron
1. Discharge the high voltage capacitors, as mentioned and
shown on page 11.
2. Disconnect 2 high voltage lead wires from magnetron
filament terminals.
3. Remove 2 screws holding the magnetron.
NOTE:
After replacement of the magnetron, tighten mounting screws
in an X pattern, properly making sure there is no gap between
the waveguide and the magnetron to prevent microwave
leakage.
CAUTION
When replacing the magnetron, be sure the antenna
gasket is in place.
• 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. Slide the escutcheon base upward slightly.
3. Remove 1 screws holding DPC
• To replace membrane key board
4. Push the upper part of key board (display window portion)
from back of escutcheon base and peel off escutcheon
sheet and membrane key board completely from
escutcheon base.
NOTE:
(A). 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.
(B). 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.
(C). Alignment position of membrane key board is as follows;
Membrane key board: Right and upper edges
Escutcheon sheet: Right and upper edges
• Low voltage transformer and/or power relays
(RY1, RY2)
NOTE:
Be sure to ground any static electric charge built up on your
body before handling the DPC.
(A) 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.
(B) With a the defective transformer/power relays and install
new transformer/relays making sure all terminal pins are
inserted completely. Resolder all terminal contacts
carefully.
• Inverter P.C.B.
1. Remove the cabinet.
2. Removes the high tension cable from the magnetron
terminals.
3. Disconnect CN701 & CN702.
4. Remove the ground wire screw.
5. Remove the Inverter support screw in the inferior cover.
6. Release 3 tabs under the inverter support.
7. Remove 2 screws that holds the Inverter P.C.B. the support.