Panasonic NN-8508 - Page 16

NN-8508, NN-8558
NN-8808, NN-8858
NN-8808P
-DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE
1. Replacement of the magnetron
CAUTION
Servicemen should remove their watches whenever
working close to or replacing the magnetron.
(A) Discharge the high voltage capacitor. (See page 15)
(B) Remove 2 screws holding air guide A. (Fig. 16)
(C)
Remove
2
high
voltage
leads
from
filament
terminals.
(F,
FA)
(D)
Remove
4
screws
holding
the
magnetron.
(Fig.
16)
NOTE:
To
prevent
microwave
leakage,
tighten
mounting
screws
proper-
ly
making
sure
there
is
no
gap
between
the
waveguide
and
the
magnetron.
CAUTION
When connecting 2 filament lead wires to the mag-
netron terminals, be sure to connect the lead wires in
the
correct
position.
The
lead
wire
of
high
voltage
transformer
should
be
connected
to
“F
terminal”
and
the
lead
wire
from
high
voltage
capacitor
should
be
connected
to
“FA
terminal”.
(See
Fig.
16)
2.
citor.
(A)
Disconnect
2
lead
wires
from
fan
motor
terminals.
(Fig.
17)
(B)
Disconnect
2
lead
wires
from
fuse
holder
terminals.
(Fig.
17)
(C)
Disconnect
4
high
voltage
lead
wires
from
high
voltage
capacitor
ter-
minals. (Fig. 17)
(D)
Remove
4
screws
holding
fan
motor
and
orifice
assy
and
detach
the
orifice assy with fan motor from oven assy. (Fig. 18)
(E)
Remove
fan
blade
from
the
fan
motor
shaft
by
pulling
it
straight
out.
(F)
Separate
the
fan
motor
from
the
orifice
assy
by
freeing
2
catch
hooks
on the orifice assy.
To replace high voltage capacitor
(G) Remove 1 screw holding high voltage capacitor.
Replacement of the fan motor and high voltage capa-
AIR
GUIDE A
THERMAL
CUTOUT MAGNE TRON
roe /
C$
—\—
9
arp
te
my]
|
—— =s
Of
j
Fig. 16
FAN MOTOR
TERMINALS
15A
FUSE
HIGH
VOLTAGE
CAPACITOR
Fig. 17
Fig. 18