Panasonic NN-ST340W / NN-SM330W / NN-SM330WZPE / NN-ST340WZPE Service Manual ▷ View online
6.1. Magnetron
1. Discharge the high voltage capacitor.
2. Remove 1 screw holding supporter on the magnetron.
3. Remove 1 screw holding air guide A on cavity top plate.
2. Remove 1 screw holding supporter on the magnetron.
3. Remove 1 screw holding air guide A on cavity top plate.
4. Remove 1 screw holding air guide A on the wave guide,
then remove the air guide A.
5. Remove 2 screws holding the magnetron.
NOTE:
After replacement of the magnetron,tighten mounting
screws properly, making sure there is no gap between
the
screws 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.
place.
CAUTION
When connecting 2 filament lead wires to the magnetron terminals,
be sure to connect the lead wires in the correct position. The lead wire
of high volatge transformer should be connected to “FA terminal” and
the lead wire from high voltage capacitor should be connected to “F
terminal”.
be sure to connect the lead wires in the correct position. The lead wire
of high volatge transformer should be connected to “FA terminal” and
the lead wire from high voltage capacitor should be connected to “F
terminal”.
6.2. Digital programmer circuit
(D.P.C) & Membrane switch
(NN-ST340W)
(NN-ST340W)
NOTE:
Be sure to ground any static electric charge built up on
your body before handling the D.P.C.
your body before handling the D.P.C.
1. Remove 1 screw holding escutcheon base on cavity front
plate.
2. Disconnect all connectors from D.P.C. board.
3. Disconnect red case connector from secondary latch
switch.
4. Remove 5 screws holding D.P.C. board on escutcheon
base.
6 DISASSEMBLY AND PARTS REPLACEMENT
PROCEDURE
13
NN-ST340W / NN-SM330W
5. Separate D.P.C board from tabs on the escutcheon base
and remove D.P.C board.
To replace membrane key board
To replace membrane key board
6. Remove 1 screw holding back plate and bracket on
escutcheon base, then remove back plate and bracket.
7. Use tools such as kinfe etc. to lift the edge of membrane
sheet and peel off escutcheon sheet & key board
membrane completely from escutcheon base.
NOTE:
membrane 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.
Therefore, applying hot air such as using a hair dryer
is recommended for smoother removal.
b. When installing the new key board membrane, make
sure that the surface of escutcheon base is clean to
prevent a malfunction or shorted contacts.
prevent a malfunction or shorted contacts.
6.3. Low voltage transformer
and/or power relays (RY1)
(NN-ST340W)
(NN-ST340W)
NOTE:
Be sure to ground any static electric charge built up on
your body before handling the D.P.C.
your body before handling the D.P.C.
1. Disconnect all connectors from D.P.C. board.
2. Remove 5 screws holding D.P.C. board on escutcheon
2. Remove 5 screws holding D.P.C. board on escutcheon
base.
3. Replace D.P.C. board.
(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:
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 D.P.C. contacts.
more than 30 watts on D.P.C. contacts.
(B) 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 resolder all terminal contacts
carefully.
D.P.C. contacts, remove the defective transformer/power
relays, Replace components making sure all terminal pins
are inserted completely resolder all terminal contacts
carefully.
14
NN-ST340W / NN-SM330W
6.4. Fan motor
1. Disconnect 2 lead wires from fan motor terminals.
2. Remove 3 screws holding orifice assy and detach the orifice
2. Remove 3 screws holding orifice assy and detach the orifice
assy from oven assy.
3. Remove fan blade from the motor shaft by pulling it straight
out.
4. Remove 2 screws holding fan motor on orifice assy and
detach the fan motor from orifice assy.
6.5. Door assembly
1. Support the door, remove 2 screws holding hinge A.
2. Open the door, remove door(U) and hinge A from cavity.
NOTE:
Support the door before opening.
3. Remove door C from door A (U) & door E by carefully
pulling outward starting from upper right hand corner using
a flat blade screwdriver.
a flat blade screwdriver.
4. Separate door E from tabs on door A (U) and remove door
A (U).
15
NN-ST340W / NN-SM330W
5. Remove door key and door key spring from door E.
6. Replace other components.
6. Replace other components.
To re-install components:
NOTE:
NOTE:
After replacement of the defective component parts
of the door, reassemble it properly and adjustment
so as to prevent an excessive microwave leakage.
Adjustment of the door assembly (Refer page 20).
of the door, reassemble it properly and adjustment
so as to prevent an excessive microwave leakage.
Adjustment of the door assembly (Refer page 20).
7. Place the hole of hinge A into the door’s upper hinge pin.
8. Use your left index finger to support the door’s lower hinge
pin while guiding the door’s hinge A into the cavity slot.
Then lower your finger to seat the door onto the hinge.
Then lower your finger to seat the door onto the hinge.
NOTE:
Door alignment is crucial. If door is misaligned,
apply pressure until alignment is achieved.
apply pressure until alignment is achieved.
NOTE:
Adjust so that the upper portion of the door will
touch firmly to the oven cavity front plate, without
pushing the door. If the door assembly is not
mounted properly, microwave power may leak from
the clearance between the door and oven.
touch firmly to the oven cavity front plate, without
pushing the door. If the door assembly is not
mounted properly, microwave power may leak from
the clearance between the door and oven.
9. Tighten 2 mounting screws.
Be sure the gap between door E and cavity front plate will
be 0.3~0.7mm.
be 0.3~0.7mm.
NOTE:
Always perform the microwave leakage measurement
test after installation and adjustment of door assembly.
test after installation and adjustment of door assembly.
16
NN-ST340W / NN-SM330W
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