Panasonic NN-CT577SEPG, Service Manual

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9.3 Digital Programmer Circuit (DPC)
and membrane key board.
NOTE: Ground any static electric from your body before
handling the digital programmer circuit (DPC).
1. Disconnect all lead wire plugs from the DPC.
2. Release the ribbon cable from the DPC.
3. Remove 2 screws holding the escutcheon base to
the microwave oven chassis. To remove the
escutcheon base; open the microwave oven door
and slide the escutcheon base upward slightly.
4. Remove the 6 screws holding the DPC DU assembly.
5. Remove the door lever.
6. Remove the 7 screws holding the DPC AU assembly.
To remove escutcheon pad .
1. Remove the escutcheon bracket from the escutch-
eon base by freeing the 4 catch hooks.
2. Peel away the display window from the inside of the
base.
3. Remove the membrane assembly by pushing from
the inside of the base and then peeling it away from
the outside surface.
NOTE:
1. When installing a new escutcheon key board, make
sure that the surface of the escutcheon base is
cleared, avoiding problems such as shorted contacts
and uneven surfaces.
2. When replacing a stainless / aluminium escutcheon
assembly, ensure that the stainless facia is earthed
to the escutcheon back plate via the earth spring.
figure 10 Removal of DPC AU and DPC DU
9.4 Low voltage transformer and / or
power relays (RY1)
Note
Ground your body to discharge static charges
before handling the DPC.
1. Carefully remove all solder from the terminal pins of
the low voltage transformer / power relays using a
30W soldering iron and a solder sucker.
2. With all of the terminal pins cleaned and separated
from the DPC contacts, remove the defective trans-
former / power relays and install the new compo-
nents making sure that the terminal pins are
inserted completely. Carefully re-solder all terminal
contacts carefully.
Note
Do not use a soldering iron of more than 30 watts
on DPC contacts
9.5 Fan Motor
1. Remove 2 screws to remove the tie bar.
2. Disconnect the 2 lead wires from the fan motor ter-
minals.
3. Disconnect all lead wires from the noise filter.
4. Remove the noise filter.
5. Remove 2 screws to remove cover B.
6. Remove 2 screws holding the orifice assembly.
7. Remove 2 screws holding the fan motor assembly.
8. Detatch the orifice assembly and the fan motor
assembly from the microwave oven.
9. Remove the fan blade from the fan motor by pulling
outward.
figure 11 Removing the fan motor.
9.6 Door replacement
1. Carefully lever door C away from Door E using a flat
blade screwdriver.
2. Remove 4 screws holding the door E to the door A
assembly.
3. Remove the door screen B by unclipping the screen
B from the door A catch hooks. Take care when
removing the door screen B from door A, it is possi-
ble to damage the catch hooks on the door A .
4. Remove the door key and spring from the door E.
DPC DU DPC AU