Panasonic NN-8508 User manual

ORDER NO. MOD88090
ual
Microwave Oven
NN-8508, NN-8558
NN-8808, NN-8858
NN-8808P
Specifications
Power Source :
120 V AC Single Phase 60 Hz
(50/60 Hz for NN-8808P only)
Power Requirement : 1,400 W (12.2 A)----- Microwave
1,500 W (12.5 A): Bake and Broil
Output : 700 W:-:--:Full Microwave Power
1,400 W::--:- Heater |
Microwave Frequency : 2,450 MHz
Timer : 99 Min. 99 Sec./9 Hr. 99 Min.
Outside Dimensions : 22” (W) X 17-1/4” (D) X 15-3/16” (H)
558 mm (W) X 439 mm (D) X 385 mm (H)
Oven Cavity Dimensions : 14-7/16" (W) X 14-5/8” (D) X 9-1/8" (H)
367 mm (W) X 372 mm (D) X 232 mm (H)
Weight : 55 Ibs (24.5 kg)
Specifications subject to change without notice.
Matsushita Services Company Panasonic Hawaii, Inc. Panasonic Sales Company,
i 50 Meadowland Parkway, 99-859 Iwaiwa Street Division of Matsushita Electric
Secaucus, New Jersey 07094 P.O. Box 774 of Puerto Rico, Inc.
Honolulu, Hawaii 96808-0774 Ave, 65 De Infanteria, KM 9.7
® Victoria Industrial Park
Matsushita Electric Carolina, Puerto Rico 00630
of Canada Limited
5770 Ambler Drive, Mississauga,
: ; Ontario, L4W 2T3
Copyright© 1988 by Matsushita Electric Corporation of America, All rights reserved. :

core phat
NIN-8508, NN-8558
NN-8808, NN-8858
NN-8808P
This
service
manual
covers
products
for
following
markets.
When
troubleshooting
or
replacing
parts,
please
refer
to
the
country
identifications
shown
below
for
your
applicable
‘product
specification.
Me
For
U.S.A.
and
some
of
Latin
America
countries
--For Canada
fe Ap ; WARNING
4.
This
product
should
be
serviced
only
by
trained
qualified
personnel.
2.
Though
this
product
has
been
manufactured
in
compliance
with:
“Federal
Performance
Standard
21
CFR
Subchapter
J”
(D.H.H.S.):
U.S.A.
models
or
“Radiation
Emitting
Devices
Act’
(NHW):
Canadian
models
it
is
very
important
all
repairs
should
be
made
in
accordance
with
procedures
described
in
this
manual
to
avoid
being
exposed
to
excessive
microwave
radiation.
;
3.
Check
for
radiation
leakage
after
every
servicing
according
to
the
“procedure
for
measuring
radiation
leakage”
on
page
24.
4.
Any
serviceman
who
learns
of
any
accident
pertaining
to
microwave
radiation
leakage
should
immediately
notify
the
appropriate address listed below.
IN
U.S.A.
Matsushita
Services
Company
IN
PUERTO
RICO
PSC
(MSC)
50
Meadowland
Park
way,
(PSC)
Ave.
65
De
Infanteria,
KM
9.7
Secaucus, New Jersey 07094 Victoria Industrial Park
Attention: Engineering Support Division. Carolina, Puerto Rico 00630
[phone] [phone]
IN
HAWAII
PHI
IN
CANADA
Matsushita
Electric
of
Canada
Limited
(PHI) 99-859 Iwaiwa Street (MELCA) 5770 Ambler Drive, Mississauga,
P.O. Box 774 Honolulu, Hawaii 96808-0774 Ontario, L4W2T3
[phone] [phone]
5.
There
are
special
components
used
in
the
microwave
oven
which
are
important
for
safety.
These
parts
are
marked
with
a
ZX
on
the
replacement
parts
list.
It is
essential
that
these critical parts should be replaced with
manufacturer's
specified
parts
to
prevent microwave
leakage,
shock, fire,
or
other
hazards. Do
not modify the
original
design.
PRECAUTIONS
TO
BE
OBSERVED
BEFORE
AND
DURING
SERVICING
TO
AVOID
POSSIBLE
EXPOSURE
TO
EXCESSIVE
MICROWAVE
ENERGY
(A)
Do
not
operate
or
allow
the
oven
to
be
operated
compartments,
check
the
magnetron,
waveguide
with
the
door
open.
or
transmission
line,
and
cavity
for
proper
align-
(B)
Make
the
following
safety
checks
on
all
ovens
to
ment,
integrity
and
connections.
ors
be
serviced
before
activating
the
magnetron
or (D)
Any
defective
or
misadjusted
components
in the
in-
other
microwave
source,
and
make
repairs
as
terlock,
monitor,
door
seal,
and
microwave
genera-
necessary:
:
tion
and
transmission
systems
shall
be
repaired,
re-
(1)
Interlock
operation
placed,
or
adjusted
by
procedures
described
in
(2) Proper
door
closing
this
manual
before
the
oven
is
released
to
the
(3)
Seal
and
sealing
surfaces
(arcing,
wear,
and
owner.
other damage)
(E)
A microwave
leakage
check
to
verify
compliance
(4)
Damage to or
loosening
of
hinges
and latches.
with
the
Federal
Performance
Standard
should
be
(5)
Evidence
of
dropping
or
abuse
performed
on
each
oven
prior
to
release
to
the
(C)
Before
turning
on
microwave
power
for
any
service
owner.
test
or
inspection
within
the
microwave
generating
CONTENTS
PRECAUTIONS
TO
BE
OBSERVED
BEFORE
AND
DURING
K
FACTORS
AND
POWER
LEVELS
vv
esstesssresetsreeieeeteisereees
mae
SERVICING
TO
AVOID
POSSIBLE
EXPOSURE
TO
CAUTIONS
TO
BE
OBSERVED
WHEN
TROUBLESHOOTING:-**-"+----
15
EXCESSIVE
MICROWAVE
ENERGY
*i-0s-rsescssstercsrestesreseeeteecenenecs
2
DISASSEMBLY
AND
PARTS
REPLACEMENT
PROCEDURE:***--"-""*
16
FEATURE
CHART
&
LOCATION
OF
NAMEPLATE
*eerrrerrcesrteeseteeeeses
3
COMPONENT
TEST
PROCEDURE
crertrtrctetetreetecteceee
seer
eer
ne
neenees
94
FEATURE
DIAGRAM
&
CONTROL
PANEL
«rrsrstrrrrrrrtttettrrerrrereere
4
MEASUREMENTS
AND
ADJUSTMENTS
sccceccerccesccsceteeesetteeen
esse
ee
23
OPERATION
PROCEDURE
--0-+0+-+--+sessesrseeseeestereerseesetesttstceseerenaees
5
PROCEDURE
FOR
MEASURING
MICROWAVE
ENERGY
LEAKAGE
--
24
ACCESSORIES & COOKING UTENSILS bane e eee nee eer e teen nee neta eeassesenneas 6 TROUBLESHOOTING GUIDE errr errr eter ret teeter reer errr r ere eee eer
SCHEMATIC
DIAGRAM
(FOR
U.S.A.
MODELS)
<0
-r0ser0rcerereeeerees
7
DIGITAL
PROGRAMMER
CIRCUIT-TEST
PROCEDURE
vy
SCHEMATIC DIAGRAM (FOR CANADIAN MODELS) aed t ee ee arn eneeecrneres 8 EXPLODED VIEW AND PARTS LIST seer santes once enter vee sacreesonen ee yes
SCHEMATIC
DIAGRAM
(NN-8808P):*+-020-200
sce
ceretsertereeseetetereeteees
9
DIGITAL
PROGRAMMER
CIRCUIT
PARTS
LIST:--
seen
DESCRIPTION
OF
OPERATING
SEQUENCE
Peeve
eereee
er
rete
rere
ree
ere
eee
10
AUTO SENSOR EXPLANATION,
gee)
~2-

NN-8508, NN-8558
NN-8808, NN-8858
NN-8808P
FEATURE CHART
NN-8858
NN-8558 NN-8808P
CYCLIC DEFROST
THREE STAGE COOKING
AUTO WEIGHT DEFROST
AUTO REHEAT
AUTO WEIGHT COMBINATION COOKING
COMBINATION
—
TIME
COOKING
a
ee
BAKING
—
AUTO
PREHEATING
enn
Mus
BROILING — AUTO PREHEATING
S
[aromur SSSCSC~C“S*S*S*S*~‘“dSCSCSC“‘“ CT
PToericex SSSCSC~C~“‘“iRSC“‘ MSCS
PRODUCT DESTINATION LOCATION OF NAMEPLATE
MODEL
wee | —[o
wes [os
[wae [0 |
%% 2K For U.S. Military Market
Fig. A
The nameplate is located on frame of the escutcheon base as
illustrated in Fig. A.
The model and serial numbers will be found on this nameplate.

NN-8508, NN-8558
NN-8808, NN-8858
NN-8808P
CONTROL PANEL
NN-8808/8858/8808P
@Display Window
@Time Pads
@Power Pad
@Stand/Timer Pad
@Bake Cooking Pad
©AW. Combination Pad
@1.0 lb Pad
®Cooking Guide
@aAuto Reheat Pads
(Auto Sensor Cook Pad
@Stop/Reset Pad
QDA.Start/Clock Pad
@Combination Cooking Pad
(@Broiling Pad
(AW. Defrost Pad
(0.1 Ib Pad
@Doneness Pad
@®Start Pad

NN-8808P
. OPERATION PROCEDURE |
Pecans eras STEP 1 STEP 2 STEP 3 STEP 4 STEP 5
[craven 2 times
[start |
(TWO STAGE)
ar | Se [reece
me ai [ |
mm oe Sf
AUTO REHEAT
AUTO SENSOR
REHEAT
NN-8508, NN-8558
NN-8808, NN-8858
For
more
detailed
operating
sequence,
see
pages
31
through
33.
NOTES WHEN PROGRAMMING:
1. CLOCK SET:
(1) To reset time of day, repeat step 1 through step 3.
(2)
The
clock
will
keep
the
time
of
day
as
long
as
oven
is
plugged
in
and
electricity
is
supplied.
(8) To delete “88:88” indication, touch Stop/Reset pad.
2. AUTO SENSOR REHEAT:
(1) Reheat covered with lid or plastic wrap.
(2) Stand time or a power level can be programmed after Auto Sensor
Reheat.
For best results follow these recommendations:
(1) Select correct category of food being reheated. All foods must be
previously cooked.
(2) Make sure glass tray in the oven is dry to assure best cooking results.
(3) Foods should always be covered loosely with plastic wrapper lid.
(4) Foods weighing less than 4 ounces and more than 32 ounces should
be reheated by power and time only.
(5) All foods should have a covered stand time of 3 to 5 minutes.
(6) The surrounding room temperature should not be above O5°F.
Inaccurate cooking may result.
If desired
AUTO SENSOR A. [eae | [start |
Ree START
AUTO
WEIGHT
AUTO
WEIGHT
COMBINATION [1.o18]o.118] 0.118) START
COMBINATION-
er
en
DO NOT
(1) Open oven door during reheat time. Opening door may cause inaccu-
rate cooking results. The oven door may be opened once the timed
countdown appears in display window. ~
(2) Reheat bread and pastry products. Use manual power and time.
(3) Cook or reheat raw or uncooked food.
(4) Use reheat if oven cavity is warm.
{5) Use reheat for beveragas.

NN-8508, NN-8558
NN-8808, NN-8858
NN-8808P
ACCESSORIES & COOKING UTENSILS
Accessories
and
Use
iii
titi
titi
titi
tite
tigi
titi
eit
it
0
0
00MM
iit
Oven Pan
Oven Pan is used for BAKE and
BROIL. Do not use the Oven Pan
for Microwave or Combination.
COMBINATION
AGES
ARE ra.
Spatter shield
Metal Tray
Spatter Shield
The Spatter Shield is used for
COMBINATION and BROIL to
help prevent spattering.
Metal Tray
Metal Tray is used for
COMBINATION and
MICROWAVE. Remove
Metal Tray when using BROIL or
BAKE.
BAKING
Oven Pan
. Metal Turntable |
The metal turntable should always
remain in the oven. It should never
be removed when oven is in
operation.
BROILING
Ko)
ESE E
Spatter shield Oven Pan
Cooking Utensils iwininisiniaiein yan ninn eae nae AH RE NE
Following is a summary chart which describes the correct use of cooking utensils in your microwave/flat heater oven.
Cookware
Heat-Resistant Glass,
Glass-Ceramic (Pyrex®,
Fire King®, Corning
Ware®, etc.)
(Do not use
utensils with
metal trim)
Bake
YES YES
YES
(Do not use
utensils with
metal trim)
YES*
(Start cooking NO
time only)
Plastic Films & Wraps YES* N
Microwave-Safe Plastics
Paper Products
Straw, Wicker & Wood
Browning Dishes
O NO
Combination
(Do not use
utensils with
metal trim)
(Use metal oven
accessories
included with
this oven only)
NO
NO
NO
Broiling
YES YES,
if heat-safe
to 450°F
YES NO
YES
NO
NO NO
*If Bake or Combination was used prior to Microwave, allow metal tray to cool 15-20 min. before using these dishes.
NOTE: FOR MORE INSTRUCTIONS ON THE CORRECT USE OF UTENSILS IN YOUR OVEN, PLEASE READ
THE INTRODUCTION SECTION IN THE PANASONIC COOKBOOK.

NN-8508, NN-8558
NN-8808, NN-8858
NN-8808P 2
SCHEMATIC
DIAGRAM
(FOR
U.S.A.
MODELS)
-
NN-8508/NN-8808/NN-8858
APH
PLUG NOTE: Door is closed.
cK
ra
OE
ps
Unit
is
not
operated.
LATCH
Ground
THERMAL
SWITCH
A
CUTOUT (PRIMARY) zr Chassis
AC120V
60Hz
LOWER | UPPER ] SHORT
HEATER] HEATER! SWITCH
LATCH! P120
SWITCH B HIGH VOLTAGE
(SECONDARY) TRANSFORMER
LOW VOLTAGE
TRANSFORMER
DIGITAL
PROGRAMMER
CIRCUIT
of0
HUMIDITY
SENSOR
(NN-8808/
8858)
OVEN TEMP SENSOR
(OVEN THERMISTOR)
WIRING
DIAGRAM
NOTE:
#*When
replacing,
check
the
lead
wire
color
as
shown.
*Colors
shown
by
(_
)
indicate
colors
of
lead wire
connector housing.
LATCH SWITCH A HUMIDITY SENSOR POWER RELAY B
TOP (RY2)
COLOR
ORANGE
BLUE
BROWN
WHITE
| OR __|
| BL
| BR
|W
| YT YELLOW
| Rd
| GR
|B
CK
LATCH
SWITCH
B
SHORT
SWITCH
POWER
RELAY
C
POWER
RELAY
D B
Auee
BOTTOM (OUTSIDE) BOTTOM (INSIDE) (RY3) (RY4)
aryw | BROWN
/WHITE
BL
Y
GR Y
/W

NN-8508, NN-8558
NN-8808, NN-8858
NN-8808P
SCHEMATIC DIAGRAM (FOR CANADIAN MODELS)
NN-8558/NN-8808 CPH
PLUG
WHITE BLACK
AC120V
60Hz
THERMAL
CUTOUT
VARISTOR
LOW VOLTAGE
TRANSFORMER
WIRING DIAGRAM
LATCH SWITCH B
BOTTOM (OUTSIDE)
NOTE:
C
(SECONDARY)
Door is closed.
Unit is not operated.
+ Ground
zr Chassis
LOWER | UPPER
HEATER] HEATER
~
POWER
POWER
RELAY C
RELAY D
DIGITAL PROGRAMMER CIRCUIT
Lame!
POY
OVEN TEMP SENSOR
(OVEN THERMISTOR)
Oo
SHORT
SWITCH
HOODOO UOQDOOY Y
20
HIGH VOLTAGE
TRANSFORMER
ae HUMIDITY SENSOR
(NN~8808)
NOTE: When replacing, check the lead wire color as shown.
*Colors shown by (_) indicate colors of lead wire
connector housing.
SHORT SWITCH
BOTTOM (INSIDE)
POWER RELAY C
POWER RELAY B
POWER RELAY D
SYMBOL
PR | RED
GRAY
| 8 | BLACK
BL
W
Y
GR

NN-8508, NN-8558
NN-8808, NN-8858
NN-8808P
SCHEMATIC DIAGRAM (NN-8808P)
PLUG NOTE: Door is closed. MAGNETRON
ya a Unit is not operated.
< Ground
THERMAL
SWITCH A
CUTOUT (PRIMARY) zr Chassis
TURN
OVEN | TABLE | FAN oS
AGI20V LAMP | MOTOR] MOTOR’
Zz . 6
= O@ © |
LOWER | UPPER | SHORT S
HEATER] HEATER] SWITCH
LATCH! = —s pa
SWITCH B HIGH VOLTAGE
(SECONDARY) | TRANSFORMER
90
°o
0000000000009
POWER_ | POWER
RELAY 0 | RELAY C
[vssron a sees Scie cine
RELAY € : T ot RELAY B
-— 1 1 —
nies
(v)
o10a
010
| TRANSFORMER Pa se]
DIGITAL PROGRAMMER CIRCUIT Lemel Pan ; HUMIDITY SENSOR
OVEN TEMP SENSOR
(OVEN THERMISTOR)
This oven is equipped with automatic conversion system for both SOHz and 60Hz power supply
frequencies with a standard 115-120 volt supply.
No specific adjustment is necessary for conversion of the power supply frequency.
WIRING DIAGRAM NOTE: *When replacing, check the lead wire color as shown.
*Colors shown by (_ ) indicate colors of lead wire
connector housing.
LATCH SWITCH A POWER RELAY 8
| OR ORANGE |
| BR - BROWN |
PR | RED
| Bt BLACK |
LATCH SWITCH B SHORT SWITCH POWER RELAY C POWER RELAY D
BOTTOM (OUTSIDE) BOTTOM (INSIDE) / WHITE
BROWN
BR/W 1} /WHITE
Fig. 3

NN-8508, NN-8558
NN-8808, NN-8858
NN-8808P
DESCRIPTION OF OPERATING SEQUENCE
ON, OFF TIME ON
POWER RELAY B
ON (SEC) OFF (SEC)
1. Variable power cooking control
The
coil
of
power
relay
B
(RY
B)
is
energized
intermittently
by
the
digital
programmer
circuit,
when
the
oven
is
set
at
any
power
selec-
tion
except
for
High
power
position.
The
digital
programmer
circuit
controls
the
ON-OFF
time
of
power
relay
B
contacts
in
order
to
vary
the
output
power
of
the
microwave
oven
from
“Warm”
to
“High”
power.
One
complete
ON
and
OFF
cycle
of
power
relay
B
is
22
seconds.
The
relation
between
indications
on
the
control
panel
and
the
output
of
the
microwave
oven
is
as
shown
in
Fig.
4.
NOTE:
The
ON/OFF
time
ratio
does
not correspond
with
the
percen-
©
tage
of
microwave
power
since
approximately
1.5
seconds
are
required
for
heating
of
magnetron
filament.
2. Cyclic defrost
When Defrost power and defrosting time is siesta and Start pad is
tapped:
(A) The digital programmer circuit (DPC) divides the total defrosting time
into 8 cycles of alternating ON-OFF intervals of defrosting power and
standing periods. (See Fig. 5)
(B) During each defrosting period, power relay B is energized for 9
seconds and de-energized for 13 seconds by DPC. (See Fig. 6)
(C) During standing periods, power relay B is always open resulting in no
microwave power.
Approx Please refer to description
120W of cyclic defrost.
NOTE: Defrost time selected is converted into seconds by the DPC but
display will show selected time in minutes and seconds as prog-
rammed.
The
total
number
of
seconds
is
divided
into
8
time
TOTAL
DEFROSTING
TIME
periods.
The
remainder
(seconds
not
equally
divisible
by
8)
are
i)
18
1a vs
added
to
the
last
standing
time
period.
i
i
Example
:
if
defrosting
time
is
selected
for
5
minutes,
each
operating
period
will
be
as
follows
:
(See Fig.
7)
5
minutes
=
300
seconds
300/8
=
37
and
remainder
is
4
seconds.
The
4
seconds
is
added
to
the
last
time
period.
NOTE:
When
defrosting
time
is
selected
for not
more
than
7
seconds,
the
power
relay
B
will
not
be
energized
at
all.
OUTPUT POWER
INDICATION | AGAINST
HIGH POWER
mete
ao
Fig. 5
ONE DEFROSTING PERIOO(T/8)
aT
Fig. 6
S5MIN_(300SEC)
tsT 2ND 2ND LAST
STANDING( 37S) ,DEFROSTING(373) STANDING(373) STANDING( 443)
Fig. 7