Panasonic NN-S453WF / NN-S553WF / NN-K593MF / NN-K573MF / NN-K573WF / NN-K543WF Service Manual ▷ View online
4.3. Part replacement.
When any part or component is to be replaced, always ensure
that the power cord is removed from the wall outlet.
that the power cord is removed from the wall outlet.
4.4. When the 10A fuse is blown
due to the operation of the
short switch:
short switch:
WARNING
When the 10A 250V fuse is blown due to the operation of
the interlock monitor switch, replace all of the components
(primary latch switch, secondary latch switch, short switch
and power relay B (RY1)).
the interlock monitor switch, replace all of the components
(primary latch switch, secondary latch switch, short switch
and power relay B (RY1)).
1. This
is
mandatory.
Refer
to
“adjustments
and
measurements” for the location of these switches.
2. When replacing the fuse, confirm that it has the
appropriate rating for these models.
3. When replacing faulty switches, be sure the mounting
tabs are not bent, broken or deficient in their ability to
hold the switches.
hold the switches.
4.5. Avoid inserting nails, wire etc.
through any holes in the unit
during operation.
during operation.
Never insert a wire, nail or any other metal object through the
lamp holes on the cavity or any holes or gaps, because such
objects may work as an antenna and cause microwave
leakage.
lamp holes on the cavity or any holes or gaps, because such
objects may work as an antenna and cause microwave
leakage.
4.6. Confirm after repair
1. After repair or replacement of parts, make sure that the
screws of the oven, etc. are neither loose nor missing.
Microwaves might leak if screws are not properly tightened.
Microwaves might leak if screws are not properly tightened.
2. Make sure that all electrical connections are tight before
inserting the plug into the wall outlet.
3. Check for microwave energy leakage. (Refer to procedure
for measuring microwave energy leakage).
CAUTION MICROWAVE RADIATION
USE
CAUTION
NOT
TO
BECOME
EXPOSED
TO
RADIATION FROM THE MICROWAVE MAGNETRON OR
OTHER PARTS CONDUCTING MICROWAVE ENERGY
OTHER PARTS CONDUCTING MICROWAVE ENERGY
IMPORTANT NOTICE
The following components have potentials above 2000V
while the appliance is operated.
while the appliance is operated.
•
•
•
• Magnetron
•
•
•
• High voltage transformer (Located on inverter (U))
•
•
•
• High voltage diodes (Located on inverter (U))
•
•
•
• High voltage capacitors (Located on inverter (U))
Pay special attention to these areas.
When the appliance is operated with the door hinges or
magnetron fixed incorrectly, the microwave leakage can
exceed more than 5mW/cm
magnetron fixed incorrectly, the microwave leakage can
exceed more than 5mW/cm
2
. After repair or exchange, it is
very important to check if the magnetron and the door
hinges are correctly installed.
hinges are correctly installed.
4.7. Sharp edges
Caution
Please use caution when unpacking, installing or moving
the unit, as some exposed edges may be sharp to the touch
and cause injury if not handled with care.
the unit, as some exposed edges may be sharp to the touch
and cause injury if not handled with care.
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NN-S453WF
5.1. Magnetron
1. Discharge high voltage charge.
2. Remove 1 screw holding air guide A.
3. Remove 1 screw holding air guide F.
4. Remove 1 screw holding themistor.
5. Disconnect 2 high voltage lead wires from magnetron
filament terminals.
6. Remove 4 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.
5.2. Digital programmer circuit
(D.P.C) and membrane key
board.
board.
NOTE:
Before handing the D.P.C ensure that your body is
connected to ground to discharge any electric charge.
connected to ground to discharge any electric charge.
1. Disconnect all connectors from D.P.C.
2. Remove 1 screw holding escutcheon base and slide the
escutcheon base upward slightly.
3. Remove 1 screw holding D.P.C.
4. Release lock of connector CN6 by pushing both levels to
inside and pull them upward, and remove flat cable of
membrane keyboard.
membrane keyboard.
5. Separate D.P.C board from tabs on the escutcheon base
and remove D.P.C board.
To replace membrane key board
6. Push the upper part of key board (display window portion)
from back of escutcheon base and peel off escutcheon
sheet
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.
3. Alignment position of membrane key board is as
follows;
Membrane key board: Right and upper edges
Escutcheon sheet: Right and upper edges
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.
3. Alignment position of membrane key board is as
follows;
Membrane key board: Right and upper edges
Escutcheon sheet: Right and upper edges
5 DISASSEMBLY AND PARTS REPLACEMENT
PROCEDURE
10
NN-S453WF
5.3. Low voltage transformer
and/or power relays (RY1,
RY2)
RY2)
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.
(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.
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.
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
making sure all terminal pins are inserted completely. Resolder
all terminal contacts carefully.
D.P.C contacts, remove the defective transformer/power relays
making sure all terminal pins are inserted completely. Resolder
all terminal contacts carefully.
5.4. Fan motor
1. Disconnect 2 lead wires from fan motor terminals.
2. Remove 1 screw located
on oven
attaching orifice
assembly.
3. Remove orifice from oven assembly.
4. Remove 2 screws holding fan motor to oven assembly.
5. Remove fan blade from the fan motor shaft by pulling it
straight out.
5.5. Door assembly
1. Remove door C from door E by carefully pulling outward
starting from upper right hand corner using a flat blade
screwdriver.
screwdriver.
2. Separate door E from tabs on door A and remove door A.
3. Open Door E at the opening angle of approximately
10°(Note: The door cannot be removed if the opening
angle is greater than 10°).
angle is greater than 10°).
4. Remove the door E from its hinges by pushing the door E
upward and out.
5. Remove door screen B from door A.
6. Remove door key and door key spring.
7. Place the door´s lower hinge pin into the bottom hinge hole.
8. Use your left index finger to support the door´s lower hinge
pin while guiding the door´s upper hinge pin into the top
hinge hole.
hinge hole.
9. Lower your finger to seat the door onto the hinges.
10. Replace other components.
NOTE:
Door alignment is crucial. If door is misaligned, apply
pressure until alignment is achieved.
pressure until alignment is achieved.
NOTE:
After replacement of the defective component parts of
the door, reassemble, install, and perform microwave
leakage test.
the door, reassemble, install, and perform microwave
leakage test.
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NN-S453WF
5.6. Turntable motor
1. Remove the motor cover by cutting at the locations
indicated by the arrows with a cutter.
NOTE:
After removing the motor cover, be sure that cut
portions are properly trimmed or bent to the inside
so that no sharp edges will be exposed to outside.
portions are properly trimmed or bent to the inside
so that no sharp edges will be exposed to outside.
2. Disconnect 2 lead wires connected to the turntable motor.
3. Remove the turntable motor by removing screw.
NOTE:
After
replacing
the
new
turntable
motor
and
reconnecting the two lead wires, reinstall the motor
cover by rotating it 180°, tucking the tabs into the
base in the 2 provided slots, then screw the single
tab to the base using a 4mm X 6mm screw (not
provided).
cover by rotating it 180°, tucking the tabs into the
base in the 2 provided slots, then screw the single
tab to the base using a 4mm X 6mm screw (not
provided).
5.7. Steam sensor
1. Disconnect connector CN2 from digital programmer circuit
board.
2. Disengage catch hooks on sensor cover c from orifice.
3. Remove steam sensor from orifice.
NOTE:
When installing the steam sensor, make sure that the
direction of steam sensor is as shown in figure.
direction of steam sensor is as shown in figure.
12
NN-S453WF
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