Panasonic NN-8508 - Page 23

NN-8508, NN-8558
NN-8808, NN-8858
NN-8808P
MEASUREMENTS AND ADJUSTMENTS
WARNING
For
continued
protection
against
radiation
hazard,
re-
place
only
with
identical
replacement
parts
(Part
No.
ANE61424L0AG,
Type
No.
V-16G-3C26
for
latch
switch
A,
Part
No.
A61424650AP,
Type
No.
L-3C2-
MR
for
latch
switch
B
and
Part
No.
ANE6178-5RO,
Type
No.
L-2C2-MR
for
short
switch.
When
the
15
Amp.
fuse
is
blown
due
to
the
operation
of
short
switch,
you
must
replace
latch
switch
A
and
short
switch.
For
U.S.A.
models,
also
replace
power
relay
B
(Part
No.
AEG5J1EG12,
Type
No.
G5J-1-TP)
when
the
continuity
check
reads
shorted
contacts
(1-
2).
Then
follow
the
adjustment
procedures
below.
Interlock
switch
replacement
—
In
replacing
faulty
switches,
be
sure
mounting
tabs
are
not
bent,
broken
or
otherwise
deficient
in
their
ability
to
hold
the
switches.
1.
Adjustment
of
latch
switch
A,
latch
switch
B
and
short
switch
(A)
When
mounting
the
latch
switch
A,
latch
switch
B
and
short
switch
to
the
door
hook
assembly,
mount
the
latch
switch
A,
the
latch
switch
B
and
the
short
switch
to
the
door
hook
assembly
as
shown
in
Fig.
40.
NOTE:
No
specific
adjustment
during
installation
of
latch
switch
A,
the
short
switch
and
latch
switch
B
to
the
door
hook
is
necessary.
(B)
When
mounting
the
door
hook
assembly
to
the
oven
assembly,
adjust
the
door
hook
assembly
by
moving
it
in
the
direction
of
arrow
in
Fig.
41
so
that
the
oven
door
will
not
have
any
play
in
it.
Check
for
play
in
the
door
by
pulling
the
door
assembly.
Make
sure
that
the
latch
keys
move
smoothly
after
adjustment
is
completed.
Completely
tighten
the
screws
holding
the
door
hook
assembly
to
the
oven
assembly.
2. Measurement of microwave output
The
power
output
of
the
magnetron
can
be
determined
by
performing
a simple water heating test as described below.
Necessary Equipment:
*Two 1 liter beakers *Glass thermometer
“Wrist watch or stopwatch
NOTE:
Check
the
line
voltage
under
load.
Low
voltage
will
lower
the
magnetron
output.
Take
the
temperature
readings
and
heating
time
as
accurate
as
possible.
(A)
Fill
each
beaker
with
exactly
one
liter
of
tap
water.
Stir
the
water
using
the
thermometer
and
record
each
beakers
temperature
(recorded
as
T1A
and
T1B).
(B) Place both beakers on the center of glass cook plate.
Set
the
oven
for
High
power
and
heat
it
for
exactly
two
minutes.
(C)
Stir
the
water
again
and
read
the
temperature
of
each
beaker
(re-
corded
as
T2A
and
T28).
(D)
Obtain
the
temperature
rise
by
using
the
following
formula:
(T2A + T2B)—(T1A + T1B)
2
Average temperature rise =
The normal temperature rise for these models should be 16° to 20°F
(8.9°
to
11.5°C)
at
the
“High”
power
selection
with
the
oven
operating
at the specified line voltage.
(E) To obtain the power output, multiply the average temperature rise by
39 (or 70 if thermometer is in Celsius).
Example:
If you find average temperature rise of 18°F, the ovens output is
18 X 39 = 702 watts.
NOTE: This test may be conducted by heating one liter of water for one
minute
if
only
one
beaker
is
available.
In
this
instance
you
will
find
the
temperature
rise
being
smaller
than
the
above
specifications
due
to
the
microwave
absorption
characteristic.
You
may
judge
the
magnetron
to
be
normal
when
the
temperature
rise
is
greater
than 13.5°F(or 7.5°C).
LATCH
SWITCH A
SHORT
SWITCH
SWITCH B
Fig. 40
LATCH
SWITCH A
DOOR HOOK
ASSEMBLY
SHORT
SWITCH
SWITCH B
Please confirm that the gap between the switch housing and switch
actuator levers is no more than 1.0mm when the door is closed.
Fig. 41