Panasonic NN-6207 User manual

ORDER NO. MOD87050806C1
Service
Manua
Microwave Oven
NN-6207
NN-6307
NN-6407
NN-6507
NN-6567
NN-6607
NN-6/707
NN-6757
NN-6807
Specifications
-——oatnuts
Powe
caine
OM
|
99 min. 99 sec. (Digital):--Touch Control moc!
30 min. (Rotary)---NN-6207
Outside
Dimensions
:
20-7/8"
(W)
X
14-3/4”
(D)
X
14”
(H)
Oven
Cavity
Dimensions
:
13-7/8"”
(W)
X
12-5/8”
(D)
X
10-1/4”
(H)
354 mm (W) X 320 mm (D) X 259 mm (H)
33 Ibs (15.0 kg) .
ject to change without notice.
Specifications sub
Matsushita
Services
Company
Panasonic
Hawaii
Inc.
Panasonic
Sig
Coompany,
50
Meadowland
Parkway,
91-238
Kauhi
St.
Ewa
Beach
Division
of
Migueshita
Electric
Secaucus,
New
Jersey
07094
P.O.
Box
774
of
Puerto
Ric;
inc.
Lal
Honolulu, Hawaii 96808-0774 Ave, 65 De Ininte fia, KM 9.7
Matsushita
Electric
Victoria
Indusjgy
fark
®
of
Canada
Limited
Carolina,
Puet
R@
co
00630
5770 Ambler Drive,Mississauga,
Ontario, L4W 2T3
Copyright©
1987
by
Matsushita
Electric
Corporation
of
America,
All
rights
reserved.

NN-6207, NN-6307, NN-6407
NN-6507,
NN-6567,
NN-6607,
NN-6757
NN-6707, NN-6807
This service manual covers products for following markets.
When troubleshooting or replacing parts, please refer to the country identifications shown below for your applicable products
specification.
APH--- For U.S.A and some of Latin America countries
CPH:-- For Canada
. WARNING
1. 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 22.
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) 91-238 Kauhi St. Ewa Beach (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 shaded on the
schematic diagram and marked with a A\ 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 motify 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 with compartments, check the magnetron, wavegude or
the door open. — transmission line, and cavity for proper alignmet, in-
(B) Make the following safety checks on all ovens to be tegrity and connections.
serviced before activating the magnetron or other mic- (D) Any defective or misadjusted components in theinter-
rowave SOUIce, and make repairs as necessary: lock, monitor, door seal, and microwave geneation
(1) Interlock operation and transmission systems shall be repaired, repaced,
(2) Proper door closing or adjusted by procedures described in this marqual
(3) Seal and sealing surfaces (arcing, wear, and other before the oven is released to the owner.
damage) (E) A microwave leakage check to verify compliance: with
(4) Damage to or loosening of hinges and latches. the Federal Performance Standard should be per-
(5) Evidence of dropping or abuse formed on each oven prior to release to the ower.
(C) Before turning on microwave power for any service
test or inspection within the microwave generating

NN-6207, NN-6307, NN-6407
NN-6507, NN-6567, NN-6607, NN-6757
NN-6707, NN-6807
CONTENTS
(page)
LOCATION
OF
NAMEPLATE......csssssssssssssneesscesseatatserssessseenseseeee
3
CAUTIONS
TO
BE
OBSERVED
WHEN
TROUBLESHOOTING........-ssseeee
14
:
FEATURE
CHART
..s0ns-ccressserecersressssesonssnsvsssnensnessnesaeseorarseate
4
DISASSEMBLY
AND
PARTS
REPLACEMENT
PROCEDURE
.........++e+0s+s
15
CONTROL
PANEL...
s:cesscssssteseeessserorsscessonsressesenereneasnscecanasees
5
COMPONENT
TEST
PROCEDURE.
cic2:vaussicd
scassaascasdsascdscensuestis
19
|
OPERATION
PROCEDURE
(Touch
Control
models)
.....++seseesesereseseeeees
6
MEASUREMENTS
AND
ADJUSTMENTS
......:ssssssssersrersecsrsensssenens
21
|
SCHEMATIC
DIAGRAM
(NN-6207)....ssssesssesesssscsscerecesseeserenseesees
7
PROCEDURE
FOR
MEASURING
MICROWAVE
ENERGY
LEAKAGE..........
22
SCHEMATIC
DIAGRAM
(Touch
Control
models)
(APH)
....-+s+e+srrseseeees
8
TROUBLESHOOTING
GUIDE
(For
NN-6207)
......ssssssssssssesssteneesssees
23
SCHEMATIC
DIAGRAM
(Touch
Control
models)
(CPH)
.....-++sseseeeeesrens
9
TROUBLESHOOTING
GUIDE
(Touch
Control
models).......ssssssseeeeeeees
26
DESCRIPTION
OF
OPERATING
SEQUENCE.....ssssesssereseseesseesseeeereee
10
DIGITAL
PROGRAMMER
CIRCUIT
TEST
PROCEDURE
.......c:sssseseesees
33
AUTO
SENSOR
EXPLANATION,
EXPLODED
VIEW
AND
PARTS
LIST...s+scscscscsserssseressrsrsesstseseestirs
38
i
K
FACTORS
AND
POWER
LEVELS
.....ssssssssssssersssssesersrerseseaeneaees
12
FI
LOCATION
The
nameplate
is
located
on
frame
of
the
escutcheon
base
as
illustrated
i
The
model
and
serial
numbers
will
be
found
on
this
nameplate.
OF NAMEPLATE
N
Fig. A
n Fig. A.
—' 3 pants

NN-6207,
NN-6307,
NN-6407
NN-6507,
NN-6567,
NN-6607,
NN-6757
NN-6707,
NN-6807
2
FEATURE CHART
NN-6707
NN-6807
i
nn-ors7 | NWS007
NN-6507
NN-6567
NN-6307 Sater
NN-6407 ;
CYCLIC DEFROST
2-STAGE COOKING
3-STAGE COOKING
COOK
AUTO
COOK-WARM
SENSOR
FROZ-COOK
CONTROL
FROZ-COOK-WARM
AUTO WEIGHT DEFROST
AUTO WEIGHT COOK
AUTO WEIGHT FROZ COOK
AUTO REHEAT
TEMP PROBE COOK
AUTO START
MECHANICAL TIMER
MECHANICAL
VARI-POWER
>XNN-6407 only

NN-6807
NN-6607
NN-6407
CONTROL PANEL
NN-6707
NN-6757
NN-6507
NN-6567
NN-6307
NN-6207, NN-6307, NN-6407
NN-6507, NN-6567, NN-6607, NN-6757
NN-6707, NN-6807

NN-6207,
NN-6307,
NN-6407
NN-6507,
NN-6567,
NN-6607,
NN-6757
NN-6707,
NN-6807
:
OPERATION PROCEDURE (Touch Control models)
rt ar fiae ststiiciveinsunininssexabinantcatanamtaenahaasne
CLOCK
POWER
DEFROST
Cgc
foc
cao
(ao)
co
Clock Set
Time Cooking
(2-Stage)
Time Defrost
Auto Weight Defrost
Auto Weight Cook
Auto Weight
Frozen Cook
Auto Reheat
Temperature
Probe Cooking
If desired
Auto
Sensor
Cook
LESS
or
If desired
Frozen
Goo
[wore
]
[tess
]
Frozen
Cook
MORE
or
If desired
Cook
Warm
[wore
]
[ess
]
Cook
Warm
MORE
LESS
or
If desired
Auto Sensor
Froz Cook Warm
FROZ-COOK
WARM MORE | | LESS
or
For
more
detailed
operating
sequence,
See
pages
33
through
37.
NOTES WHEN PROGRAMMING:
CLOCK
SIT:
:
(1)
To
reset
time
of
day
(TOD)
tap
Clock
Pad
twice
to
clear
the
time
and
enter
the
correct
TOD.
;
;
at
(2)
The
clock
will
keep
the
TOD
as
long
as
oven
is
plugged
in
and
electricity
is
supplied.
AUTO
WEIGHT
DEFROST:
(1)
Stand
time
or
time
cooking
can
be
programed
after
Auto
Weight
Defrost.
(2)
Auto
Start
can
not
be
programed
before
Auto
Weight
Defrost.
—
(3)
The
shape
and
size
of
the
food
will
determine
the
maximum
weight
the
oven
can
accommodate.
AUTO
WEIGHT
COOK:
(1)
Stand
time
or
time
cooking
can
be
programed
after
Auto
Weight
Cook.
(2)
The
shape
and
size
of
the
food
will
determine
the
maximum
weight
the
oven
can
accommodate.
AUTO
WEGHT
FROZEN
COOK:
(1)
Stand
time
or
time
cooking
can
be
programed
after
Auto
Weight
Frozen
Cook.
(2)
The
shape
and
size
of
the
food
will
determine
the
maximum
weight
the
oven
can
accommodate.
AUTO FRENEAT:
(1)
Stand
time
or
time
cooking
can
be
programed
after
Auto
Reheat.
POWER [+] [| START
START
START
ca
ca
==]
ca
AUTO SENSOR COOKING:
(1) The Auto Sensor system works by detecting a build-up steam o the humidity
sensor. As foods cook in a microwave oven, steam is produced. When foods are
covered, the steam will build up and escape from the dish in a turst when this
burst of steam is detected by the humidity sensor the oven autonatically calcu-
lates the remaining cooking time.
(2) When an Auto Sensor Cycle is selected, Al through A8 will appeain the display
window. The oven door should not be opened for longer than on: minute when
At through A8 appears in the display window. Opening the dr may cause
inaccurate cooking results. Once the steam is detected, a two beepsig nal is heard
the remaining cooking time immediately appears in the display widow and be-
gins to count-down. At this time, the oven door may be opened stir, turn or
add foods.
(3) The room air temperature surrouding the oven should not be abve 95°F when
using Auto Sensor Cooking feature. Inaccurate cooking may result
(4) Foods less than 3 or 4 ounces should be cooked by power and tine , not by the
Auto Sensor Cooking Cycle.
TEMPERATURE PROBE COOKING:
(1) Temperature probe must be insurted at least one inch into center ¢ food.
(2) Do not store probe inside oven cavity. Should oven be turned q accidentally,
damage to probe and/or oven may result.
(3) Do not allow temperature probe tip to touch surface of oven wi. Damage to
probe and/or oven may result.
(4) If the second stage temperature is lower than the first stage tempentu re, the oven
will turn off after the first stage cooking of cooking is completed.
—-6-—
SARA A RP A cD INANE tL ANNEAL nt AA EAE A IEE ISAS AMID ERECT AOE AAD EEE CEN REIS NOH Nl ett ta tN OR RIS Bt a hy Sih eh Kins ABASIC et Le Stet i AS RRMEA RNS an a

NN-6207, NN-6307, NN-6407
NN-6507, NN-6567, NN-6607, NN-6757
NN-6707, NN-6807
\
.
~~»
SCHEMATIC
DIAGRAM
(NN-6207)
at
SCHEMATIC
DIAGRAM
NOTE:
Door
is
closed.
Timer switch is off. == Ground 7}, Chassis
This model does not have a start button and
PLUG therefore microwave activity will start as soon
WHITE BLACK as the door is closed and timer is set.
Special caution must be taken when working
(1) on with the oven energized.
THERMAL
CUTOUT Re 5
(MAG.)
THERMAL
CUTOUT
(OVEN) r--
SWITCH
IMPORTANT SAFETY NOTE: THE SHADED AREA ON THIS SCHEMATIC DIAGRAM INCORPORATES SPECIAL FEATURES
IMPORTANT FOR PROTECTION FROM MICROWAVE RADIATION, FIRE AND ELECTRICAL SHOCK HAZARDS.
WHEN SERVICING, IT IS ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE
CRITICAL COMPONENTS IN THE SHADED AREAS OF THE SCHEMATIC DIAGRAM.
WIRING DIAGRAM
THERMAL
CUTOUT
(OVEN)
LATCH
SWITCH A
MOTOR
COIL{S-6)
SWITCH 8
TURNTABLE
MOTOR
BLA
hy OO
HIGH VOLTAGE
CAPACITOR
nasdninisssenslsatstie ta bud pet’ Saath semen ae HAM MCAS RCN OR hc Sneha EAC SNS a ll

NN-6207, NN-6307,
NN-6407
NN-6507,
NN-6567,
NN-6607,
NN-6757
NN-6707,
NN-6807
SCHEMATIC DIAGRAM (Touch Control models) (APH)
SCHEMATIC
DIAGRAM
Meer
nie
net
coaabéa.
= Ground
PLUG d
WHITE BLACK 777 Chassis
THERMAL
CUTOUT
(MAGNETRON)
TEMP PROBE
(NN-6607)
Low NOLTAGE
FoR HUMIDITY SENSOR
(NN~6707/6807)
TEMP SENSOR
(THERMAL PROTECTOR)
IMPORTANT SAFETY NOTE: THE SHADED AREA ON THIS SCHEMATIC DIAGRAM INCORPORATES SPECIAL
FEATURES IMPORTANT FOR PROTECTION FROM MICROWAVE RADIATION, FIRE AND ELECTRICAL SHOCK
HAZARDS. WHEN SERVICING, IT IS ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED
FOR THE CRITICAL COMPONENTS IN THE SHADED AREAS OF THE SCHEMATIC DIAGRAM.
WIRING DIAGRAM
THERMAL
CUTOUT
[213T+[sTel7[s {sho}
SWITCH A
{NN-6707/6807)
| HUMIDITY SENSOR
or) TY) [1] i a8
@ OOD @®
]
©
oR
DIGITAL
PROGRAMMER
SWITCH 8 emRcUIT
TURNTABLE
MOTOR
TRANSFORMER

NN-6207, NN-6307, NN-6407
NN-6507, NN-6567, NN-6607, NN-6757
NN-6707, NN-6807
SCHEMATIC
DIAGRAM
(Touch
Control
models)
(CPH)
s is closed.
SCHEMATIC DIAGRAM Saad a Prcareear ey
PLUG
WHITE BLACK
= Ground
WHEN
SERVICING,
IT
IS
ESSENTIAL
THAT
ONLY
MANUFACTURES
SPECIFIED
PARTS
BE
USED
FOR
THE
CRITICAL
WIRING
DIAGRAM
re
ann
[o——
(Paovecror
)
(NN-6707/6757
COMPONENTS
IN
THE
SHADED
AREA
OF
THE
SCHEMATIC
DIAGRAM.
76807;
HUMIDITY
SENSOR
DIGITAL
PROGRAMMER
CIRCUIT
SYMBOL
o|Q
RE
alo
Ala
HIGH VOLTAGE
CAPACITOR
Hele
7 A}3\8|9 5|2lml&
2/3 /A\<
HIGH VOLTAGE
TRANSFORMER
a
2
= Fz
Cc
min
7
4
|
OVEN j
60Hz (t)
wot, ad a TEMP PROBE
Talal
(NN-6607)
I
: : HUMIDITY SENSOR
FL (NN-6707/6757/6807)
TEMP SENSOR A
(THERMAL PROTECTOR)
IMPORTANT
SAFETY
NOTE:
THE
SHADED
AREA
ON
THIS
SCHEMATIC
DIAGRAM
INCORPORATES
SPECIAL
FEATURES
IMPORTANT
FOR
PROTECTION
FROM
MICROWAVE
RADIATION,
FIRE
AND
ELECTRICAL
SHOCK
HAZARDS.
ERI
SI

NN-6207, NN-6307, NN-6407
NN-6507, NN-6567, NN-6607, NN-6757
NN-6707, NN-6807
DESCRIPTION OF OPERATING SEQUENCE
1. Variable power cooking control (NN-6207)
The vari-power controller controls the ON-OFF time of the vari-power OUTPUT POWER ON, OFF TIME ON
switch to vary the output power of the microwave oven from “Warm” to INDICATION oe VARI-POWER SWITCH/
“High”. The vari-power controller is a part of the timer assembly. The ra TOMER POWER RELAY B
timer assembly consists of timer motor, timer switch, vari-power switch 225 225
and the combination of gears, cam and actuater lever. 22/22 (700W) ON aa
One complete cycle of the vari-power controller is 22 seconds, in which
-
.
'
“
”
“
”
.
;
17S
5S
the vari-power switch is tumed “ON” or “OFF” by the cam rotation in | 47/22 (70%)
13S 9s
Defrost 138
Ss 14S
Low 8/22 (30%) ON OEE
4S 18S
Warm 4/22 (15%)
Defrost Approx. Please refer to description
(Touch model) 110W of cyclic defrost.
H
the 22 - 2 second period.
By controlling the timing of the vari-power switch “ON” period, the
120V AC supplied to the high voltage transformer is interrupted intermit-
tently so that the average output power of the microwave oven is varied.
Fig. 4 shows the timing chart of vari-power switch operation in respect
to the power setting on the control panel.
NOTE: The ON/OFF time ratio does not correspond with the percentage of
microwave power since approximately 2 seconds are required for
heating of magnetron filament.
1”. Variable power cooking contro! (Touch control models)
The coil of power relay B (RY2) is energized intermittently by the digital
programmer circuit, when the oven is set at any power selection 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
ae
om
ae
=
a
NOTE: The ON/OFF time ratio does not correspond with the percentage of ig AN De RA aavered
microwave power since approximately 2 seconds are required for
heating of magnetron filament.
2. Cyclic defrost (Touch control models)
When defrost power and defrosting time are selected and Start pad is
j
i
Fig. 4
TOTAL DEFROSTING TIME
tapped:
(A)
The
digital
programmer
circuit
(DPC)
divides
the
total
defrosting
time
Fig.
5
into
8
equal
periods, consisting
of
four
defrosting
periods,
each
followed
by
astanding
periods.
(See
Fig.
5)
(B)
During
defrosting
power
ee
power
in
hg
is
energized
for
9
ONE
DEFROSTING
PERIOD(T-@)
:
seconds
and
de-energized
for
13
seconds
by
DPC.
(See
Fig.
6)
vs
198
98
198
(C) During standing periods, power relay B is always open resulting in no ‘Ic = ce ae aa
microwave power.
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
periods. The remainder (seconds not equally divisible by 8) are
added to the last standing time period.
Example
1:
If
defrosting
time
is
selected
for
2
minutes
56
seconds,
each
Fig.
6
operating
period
will
be
as
follows
:
(See
Fig.
7)
2
minutes
56
seconds
=
176
seconds
2MIN_S6SECLI76SEC)
176/38
=
22
DCFROSTINO(
228)
STANDING(228)
DEFROSTING(
228)
SPNOING(22S)
OSFROSTING(
228
Stance
2
25)
Example 2: If defrosting time is selected for 5 minutes, each operating
period will be as follows : (See Fig. 8)
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.
Fig. 7
SMIN (300SEC)
1ST
1sT 2N0 2N0 ast
SFROSTING( 37S} STANDING(37S) )OEFROSTING(37S) STANODINGI3/S) thee NDING. 418)
93) 138 | 98163,
Fig. 8

3.
Temperature
probe
cooking
control
(NN-6607)
The
digital
programmer
circuit
turns
off
both
power
relay
A
and
B
when
the
food
temperature,
which
is
detected
by
the
temp
probe’s
thermistor,
reaches
the
selected
temperature
and
stops
the
oven.
Current
temperature
of
the
food
is
displayed
in
rising
SF
increments
starting
at
90°F.
If
starting
temperature
is
lower
than
90°F,
“L9OF”
(meaning
lower
than
90°F)
will
be
displayed
until
food
reaches
90°F.
NOTE:
When
the
Temp-Hold
feature
is
selected,
the
digital
programmer
circuit
turns
power
relay
B
ON
and
OFF
to
maintain
the
desired
temperature
within
the
period
as
selected.
When
the
tempholding
period
has
elapsed,
the
DPC
tums
off
both
power
relay
A
and
B
and
stops
the
oven.
4.
Auto
weight
cook
control
(NN-6507/6567)
Consists of the following pads :
« Auto Weight Cook Pad
¢ Weight Pads
¢ Start Pad
When
the
Auto
Weight
Control,
Cook
feature
is
selected
by
tapping
the
appropriate
key
pads
and
the
Start
Pad
is
tapped:
(A)
The
digital
programmer
circuit
determines
the
power
level
and
cooking
time
to
complete
cooking
and
indicates
the
operating
state
in
the
display
window.
Fig.
9
shows
the
corresponding
cooking
times
with
respective
weights
by
categories.
(B)
When
cooking
time
in
the
display
window
has
elapsed,
the
oven
turns
off
automatically
by
the
controlled
signal
from
the
digital
programmer
circuit.
5.
Auto
weight
defrost
control
(Touch
control
models)
Consists
of
the
following
pads:
»
Auto
Weight
Defrost
Pad
(NN-6507/NN-6567)
¢
Weight
Pads
°
Start
Pad
When
the
Auto
Weight
Control,
Defrost
feature
is
selected
and
the
Start
Pad
is tapped:
(A)
The
digital
programmer
circuit
functions
exactly
the
same
as
when
Auto
Weight
Cook
control
is
selected,
except
for
some
variations
in
cooking
powers
and
cooking
times.
Fig.
10
shows
the
defrosting
times
for
respective
weights.
6.
Auto
weight
frozen
cook
control
(NN-6507/6567)
Consists of the following pads:
« Auto Weight Frozen Cook Pad
* Weight Pads
° Start Pad
When
the
Auto
Weight
Frozen
Cook
feature
is
selected
and
the
Start
Pad
is
tapped:
(A)
The
digital
programmer
circuit
functions
exactly
the
same
as
when
Auto
Weight
Cook
control
is
selected,
except
for
some
variations
in
cooking
powers
and
cooking
times.
Fig.
11
shows
the
cooking
times
for
respective
weights
by
categories.
7.
Auto
reheat
control
(NN-6507/6567/6407)
Consists of the following pads:
* Auto Reheat Control Pads (1-3)
* Stat Pad
When
the
Auto
Reheat
Control
feature
is
selected
by
tapping
the
appropriate
key pads and the Start Pad is tapped.
(A)
The
digital
programmer
circuit
determines
the
power
level
and
cooking
tire
to
complete
cooking
and
indicates
the
operating
state
in
the
display
window.
Fig.
12
shows
the
corresponding
cooking
times
with
respective
serving
by
categories.
(B)
When
cooking
time
in
the
display
window
has
elapsed,
the
oven
turns
off
automatically
by
a
controll
signal
from
the
digital
programmer
circuit.
NN-6207, NN-6307, NN-6407
NN-6507, NN-6567, NN-6607, NN-6757
NN-6707, NN-6807
CATEGORY 1 | CATEGORY 2 | CATEGORY 3 | CATEGORY 4
1 hour 18 min. | 1 hour 28 min.
[earn s | caveony 6 | cares 7 | caesar
14 min. 40 sec. 7 min. 40 sec.
Fig. 9
Fig. 10
seco
Pw fe | ee | |
Pom | sinmioae. | Ton owe | Tm. 00en_|
| | careconys | carecorys [|
pa |e |e TO
10 0Z gmin. 00sec. | 7min. 30s | |
20 OZ 16min. 30sec. | 15min.00se. | |
Waa | tenem [ema [
Pe [a | ain was | se |
PL ates | in ones [on |
Fig. 12
ssn

NN-6207,
NN-6307,
NN-6407
NN-6507,
NN-6567,
NN-6607,
NN-6757
NN-6707,
NN-6807
AUTO
SENSOR
EXPLANATION,
K
FACTORS
AND
POWER
LEVELS
(NN-6807/6707/6757)
1. Auto sensor cooking
Auto
sensor
cooking
is
a
revolutionary
way
to
cook
by
microwave
with-
out
setting
a
power
level
or
selecting
a
time.
All
that
is
necessary
is
to
select
an
Auto
Sensor
Program
before
starting
to cook.
Understanding
of
Auto
Sensor
Cooking
As
a
food
cooks,
a
certain
amount
of
steam
is
produced.
If
the
food
is
covered,
this
steam
builds
up
and
eventually
escapes
from
the
contain-
er.
In
Auto
Sensor
Cooking,
a
carefully
designed
instrument,
called
the
humidity
sensor
element,
senses
this
escape
of
steam.
Then,
based
upon
the
Auto
Sensor
Program
selected,
the
unit
will
automatically
de-
termine
the
correct
power
level
and
the
proper
length
of
time
it
will
take
to
cook
the
food.
NOTE:
Auto
Sensor
Cooking
is
successful
with
the
foods
and
recipes
found
in
the
Auto
Sensor
Cooking
Guide.
Because
of
the
vast
dif-
ferences
in
food
composition,
items
not
mentioned
in
the
Cooking
Guide
should
be
prepared
in
the
microwave
oven
using
power
select
and
time
features.
Please
consult
Variable
Power
Micro-
wave
Cookbook
for
procedures.
2. Auto sensor cooking process
Explanation
of
the
Auto
Sensor
Cooking
process
(See
Fig.
13A
and
13B)
1)
The
shaded
columns
in
both
graphs
indicate
when
the
humidity
sensor
heater
is
on.
2)
During
the
first
50
second
period
there
is
no
microwave
activity,
and
when
calculating
the
12
time
by
using
the
formula
below
make
sure
this
50
seconds
is
subtracted
from
the
T1
time.
In
other
words
T1
time
starts
at
the
end
of
the
50
second
period.
(This
50
second
period
is
needed
for
the
sensor
element
to
stabilize
and
balance
itself
to
the
humidity
present
before
microwave
activity
starts.)
3)
T1
time.....The
total
amount
of
time
it
takes
the
microwave
oven
to
switch
to
T2
time
after
the
50
second
period.
During
this
time
one
of
the
Auto
Sensor
programs
will
be
shown
in
display.
4)
T2
tirre.....When
the
steam
escapes
from
the
cooking
container
placed
in
the
oven,
the
humidity
sensor
detects
it
and
the
microprocessor
calcu-
lates
the
balance
of
cooking
time.
This
T2
time
is
then
shown
in
the
display
and
begins
counting
down.
5)
Warm.....
There
is
a
60
minite
warm
cycle
at
the
end
of
the
Auto
Sensor
programmed
COOK-WARM
and
FROZ-COOK-WARM.
When
the
warm
starts,
the
first
20
minutes
will
be
at
zero
power
to
let
the
temperature
of
the
food
equalize.
Then
for
the
remaining
40
minutes
the
oven
will
be
operating
at
35
watts
of
power
to
keep
the
food
warm.
NOTE:
If
Ti
time
is
over
60
minutes,
oven
stops
automatically
and
“FF
FF” appears in display window.
COOK/FROZ-COOK
MAGNE TRON STEAM
ON
REFRESHING
Fig. 13A
COOK-WARM/FROZ-COOK-WARM
MAGNETRON STEAM 300°
S70? SPER
WARM. i} 30 MIN, 45SEC.
$$ i,
REFRESHING
Fig. 138

Balance
of
cooking
time
(T2
time)
The
balance
of
cooking
time
which
is
called
T2
time,
can
be
calculated
by
the
following
formula.
T2
time
(in
sec.)
=T1
time
X
K
factor
NOTE:
When
calculating
T2
time,
the
last
digit
of
T1
time
in
seconds
is
cut
away.
For
instance,
if
the
T1
time
is
76
seconds,
the
T2
time
will
be:
T2=70 XK
Remember,
the
T1
time
starts
after
the
50
second
refreshing
period.
The
coefficient
K
is
programmed
into
the
microprocessor
memory
and
they
are
listed
in
the
following
tables
along
with
the
Pi
and
P2
powers.
(See
Fig.
14A
and
Fig.
14B)
NOTE:
When
“More”
or
“Less”
pad
is
selected,
the
K
factor
varies
as
shown
in
Fig.
14A
and
Fig.
14B
resulting
in
T2
time
to
be
in-
creased
or
decreased.
Example
1:
If
the
T1
time
is
measured
to
be
2
minutes
and
45
seconds
after
the
50
second
period,
and
the
Auto
program
selected
is
COOK
A4:
T2=T1 XK
= 2 min. and 45 sec. X 2.5
= 160 sec. X 2.5
== 400 sec.
= 6 min. and 40 sec.
Example2:
If
the
T1
time
is
measured
to
be,15
minutes
and
30
seconds
after
the
50
second
period,
and
the
Auto
program
selected
is
FROZ-COOK A2:
T2=T7T1 XK
= 15 min. and 30 sec. X 0.5
= 980 sec. X 0.5
== 465 SEC. .
= 7 min. and 45 sec.
NOTE:
I
using
a
calculator
please
remember
the
calculator
rounds
off
in
decimal
numbers,
so
the
T2
time
will
come
out
slightly
different
than
if
seconds
are
chariged
back
to
minutes
by
regular
long
divi-
sion.
When
using
a
calculator,
simply
multiply
the
tenths
by
60
to
get
the
correct
number
of
seconds.
For
instance
take
the
T2
time
in
seconds
from
Example
2
above.
Using
the
calculator
divide
60
into
465
and
the
quotient
will
be
7.75.
Then
multiply
0.75
by
60
and
the
product
will
be
45
seconds.
NN-6207, NN-6307, NN-6407
NN-6507, NN-6567, NN-6607, NN-6757
NN-6707, NN-6807
COOK, COOK-WARM
Pi P2 K factor
Power Power Standard
Pa foe [Te
Ps [won [eft
ns [omen | omen | 132 approx. 1.6/2.4 approx. 1/1.6
pe oo [eso fo
Fig. 14A
B wn
approx. 1.0
approx. 1.6
approx. 2.0
approx. 0.8/1.2
FROZ - COOK, FROZ-COOK-WARM
Power Power Standard
ie [J
Pa | [oe [oe few iac oe |
Pa | wow [0s forms ven ee |
Pe | we Poor [a feos |
Fae ae oe evar ces
Fa [wo [wor [0s fowmos feces |
e[wf—-fe[e [1
Pa [ wo [om [os oom ree
Pe [wo [ior [a6 feos feces |
Fig. 14B

NN-6207, NN-6307, NN-6407
NN-6507,
NN-6567,
NN-6607,
NN-6757
NN-6707, NN-6807
CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING
Unlike
many
other
appliances,
the
microwave
oven
is
high-voltage,
high-current
equipment.
Though
it
is
free
from
danger
in
ordinary
use,
extreme
care
should
be
taken
during
repair.
CAUTION
Servicemen
should
remove
their
watches
whenever
working
close
to
or
replacing
the
magnetron.
1. Check the grounding
Do
not
operate
on
a
2-wire
extension
cord.
The
microwave
oven
is
designed
to
be
used
when
grounded.
It
is
imperative,
therefore,
to
make
sure
it
is
grounded
properly
before
beginning
repair
work.
2.
Warning
about
the
electric
charge
in
the
high
voltage
capacitor
(Fig.
16)
For
about
30
seconds
after
the
oven
is
tumed
off,
an
electric
charge
remains
in
the
high
voltage
capacitor.
When
replacing
or
checking
parts,
remove
the
power
plug
from
the
outlet
and
short
the
terminal
of
the
high
voltage
capacitor
(terminal
of
lead
wire
from
diode)
to
chassis
ground
with
an
insulated
handle
screwdriver
or
insulated
jumper
lead
wire
to
discharge.
WARNING
There
is
high-voltage
present,
with
high-current
capabili-
ties
inthe
circuits
of
the
high
voltage
winding
and
filament
winding
of
the
high
voltage
transformer.
It
is
extremely
dangerous
to
work
on
or
near
these
circuits
with
oven
energized.
DO
NOT
measure
the
voltage
in
the
high
voltage
circuit
including
filament
voltage
of
magnetron.
WARNING
Never
touch
any
circuit
wiring
with
your
hand
nor
with
an
insulated
tool
during
operation.
3.
When
parts
must
be
replaced,
remove
the
power
plug
from
the
outlet.
4.
When
the
15
Amp
fuse
is
blown
due
to
the
operation
of
short
switch:
WARNING
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
when
the
continuity
check
reads
shorted
contacts
(3-4).
(A) This is mandatory. Refer to page 21 for the necessary adjustments for
these switches.
(B)
When
replacing
the
fuse,
confirm
that
it
has
the
appropriate
rating
for
these
models.
(C)
When
replacing
faulty
switches,
be
sure
mounting
tabs
are
not
bent,
broken
or
otherwise
deficient
in
their
ability
to
hold
the
switches.
5. Avoid inserting nails, wire, etc. through any holes in the
unit during operation.
Never insert a wire, nail or any other metal object through the lamp holes
on the cavity or any other holes or gaps, because such objects may work
as an antenna and cause microwave leakage.
HIGH VOLTAGE CAPACITOR
Touch chassis side first then short to the high voltage capacitor
terminal.
6. Confirm after repair ee
(A) After repair or replacement of parts, make sure that the strews of the
oven, etc. are neither loose nor missing.
Microwaves might leak if screws are not properly tighteed.
(B) Make sure that all electrical connections are tight before inseting the plug
into the wall outlet.
(C) Check for microwave energy leakage. (Refer to procedure fa measuring
microwave energy leakage on page 22.)

NN-6507, NN-6567, NN-6607, NN-6757
NN-6707, NN-6807
DISASSEMBLY
AND
PARTS
REPLACEMENT
PROCEDURE
1.
Replacement
of
the
magnetron
CAUTION
Servicemen
should
remove
their
watches
whenever
working
close
to
or
replacing
the
magnetron.
Removal
of
positive
lock
connector.
The
positive
lock
connector
is.a
specially
designed
locking
connector
and
you
will find
this
connector
in
many
lead
wire
connections.
To
remove
this
connector,
pull
the
lead
wire
by
pressing
an
extruded
lever
in
the
center
of
receptacle
terminal
as
shown
in
Fig.
17.
(A)
Discharge
the
high
voltage
capacitor.
(see
page
14)
(B)
Remove
2
screws
holding
magnetron
thermal
cutout.
(Fig.
18)
(C)
Remove
1
screw
holding
air
guide
A.
(Fig.
18)
(D)
Disconnect
2
high
voltage
lead
wires
from
magnetron
filament
terminals
(Fig. 18)
(E)
Remove
4
screws
holding
the
magnetron.
(Fig.
18)
NOTE:
After
replacement
of
the
magnetron,
tighten
mounting
screws
properly
making
sure
there
is
no
gap
between
the
waveguide
and
the
magnetron
to
prevent
microwave
leakage.
CAUTION
When
connecting
2
filament
lead
wires
to
the
magnetron
terminals,
be
sure
to
connect
the
lead
wires
in
the
cor-
rect
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.
18)
2.
Replacement
of
the
timer
(NN-6207)
(A)
Disconnect
all
lead
wires
from
timer.
(Fig.
19)
(B)
Remove
Knobs
and
remove
4
screws
holding
the
timer.
(Fig.
20)
NN-6207, NN-6307, NN-6407
i
HOW TO DISCONNECT
POSITIVE LOCK CONNECTOR
POSITIVE LOCK CONNECTOR
Fig. 17
AIR GUIDE A THERMAL MAGNE TRON
CUTOUT
LHW,
AS f .~
Lit
as
Si
y
Fig. 18
Fig. 19

NN-6207,
NN-6307,
NN-6407
NN-6507,
NN-6567,
NN-6607,
NN-6757
NN-6707,
NN-6807
2”.
Replacement
of
the
digital
programmer
circuit
(DPC)
and
membrane
key
board.
NOTE:
Be
sure
to
ground
any
static
electric
charge
built
up
on
your
body,
before
handling
the
DPC.
(A)
Disconnect
2
lead
wires
from
power
relay
B
(RY2)
terminals.
(Fig.
21A)
(B)
Disconnect
CN1
and
CN3
connectors
from
DPC.
(Fig.
21A)
(C)
Remove
1
screw
holding
escutcheon
base
and
slide
the
escutcheon
base
upward
slightly.
(Fig.
241A)
(D)
Release
CN2
connector’s
lock
of
DPC
by
pushing
both
levers
to
inside
and
pul
them
upward,
and
remove
flat
cable
of
membrane
key
board.
(Fig.
21B)
(E)
Remove
3
or
5
screws
holding
DPC.
(Fig.
21
B)
To
replace
membrane
key
board
(F)
Remove
escutcheon
bracket
from
escutcheon
base
by
freeing
4
catch
hooks
on
the
escutcheon
base.
(G)
Remove
1
screw
holding
membrane
key
board's
tab
and
peel
off
the
membrane
key
board
from
the
escutcheon
base.
(Fig.
21C)
NOTE:
The
membrane
key
board
is
attached
to
the
escutcheon
bracket
with double faced adhesive tape.
NOTE:
When
installing
new
membrane
key
board,
make
sure
that
the
surface
of
escutcheon
bracket
is
cleaned
sufficiently
so
that
any
problems
(shorted
contacts
or
uneven
surface)
can
be
avoided.
NOTE:
Make
sure
that
new
membrane
key
board
is
aligned
to
the
left
and
lower
eddes
of
the
escutcheon
bracket.
(Fig.
21C)
3.
Replacement
of
the
low
voltage
transformer
and/or
pow-
er
relays
(RY1,
RY2)
NOTE:
Be
sure
to
ground
any
static
electric
charge
built
up
on
your
body
before
handling
the
DPC.
(A)
Using
solder
wick
or
a
desoldering
tool
and
30W
soldering
iron,
careful-
ly
remove
all
solder
from
the
terminal
pins
of
the
low
voltage
transfor-
mer
and/or
power
relays.
NOTE:
Do
not
use
a
soldering
iron
or
desoldering
tool
of
more
than
30
watts on DPC contacts.
(B)
With
all
the
terminal
pins
cleaned
and
separated
from
DPC
contacts,
remove
the
defective
transformer/power
relays
and
install
new
transfor-
mer/power
relays
making
sure
all
terminal
pins
are
inserted
completely.
Resolder
all
terminal
contacts
carefully.
ESCUTCHEON
BASE
CN3
CONNECTOR
RY2
CN1
CONNECTOR
FLAT CABLE
CN2
CONNECTOR
ESCUTCHEON
BRACKET
Fig. 21A
LOW VOLTAGE
TRANSFIRMER
Fig. 21B
MEMBRAIE
KEY BORD
Fig. 21C

NN-6207, NN-6307, NN-6407
NN-6507, NN-6567, NN-6607, NN-6757
NN-6707, NN-6807
4,
Replacement
of
the
fan
motor
and
high
voltage
capa-
citor.
(A)
Disconnect
2
lead
wires
from
fan
motor
terminals.
(Fig.
22)
(B)
Disconnect
2
lead
wires
from
fuse
holder
terminals.
(Fig.
22)
(C)
Disconnect
4
high
voltage
lead
wires
from
high
voltage
capacitor
termin-
als.
(Fig.
22)
(D)
Remove
4
screws
holding
fan
motor
and
orifice
assy
and
detach
the
orifice
assy
with
fan
motor
from
oven
assy.
(Fig.
23)
(E)
Remove
fan
blade
from
the fan
motor
shaft
by
pulling
it
straight
out.
(Fig.
24)
(F)
Separate
the
fan
motor
from
the
orifice
assy
by
freeing
2
catch
hooks
on
the
orifice
assy.
(Fig.
24)
To
replace
high
voltage
capacitor
(G)
Remove
1
screw
holding
high
voltage
capacitor.
(Fig.
24)
5.
Replacement
of
temp
sensor
(thermal
protector)
(A)
Cut
2
lead-wires
at
the
top
of
sensor
terminals.
(Fig.
25)
(B)
Remove
1
screw
holding
the
temp
sensor
and
replace
with
new
one.
(Fig.
25)
(C)
Solder
the
lead
wires
securely
to
the
sensor
terminals.
19595959
9595059,
908080980890 209 oF
ORIFICE ASSY
FAN MOTOR
CATCH HOOK
FAN BLADE
HIGH VOLTAGE
CAPACI TOR
Fig. 24
OVEN
ASSEMBLY
Fig. 25

NN-6207,
NN-6307,
NN-6407
NN-6507,
NN-6567,
NN-6607,
NN-6757
NN-6707,
NN-6807
6.
Disassembly
of
the
door
assembly
(A)
Open
the
door
and
remove
door
C
from
door
E
by
carefully
pulling
outward
starting
from
upper
right
hand
corner.
(Fig.
26)
(B)
Remove
door
key
and
door
key
spring.
(Fig.
26)
(C)
Remove
3
screws
holding
side
and
bottom
frames
of
door
A.
(Fig.
27)
(D)
Separate
the
door
A
from
the
door
E
by
freeing
6
catch
hooks
on
the
door
A
using
a
flat
screwdriver.
(Fig.
27)
7.
Replacement
of
the
turntable
motor.
(A)
Lay
the
oven
on
its
as
illastrated
in
Fig.
28.
(B)
Remove
2
screws
holding
motor
cover.
(Fig.
28)
(C)
Disconnect
2
lead
wires
from
tumtable
motor
(Fig.
29).
(E)
Remove
2
screws
holding
turntable
motor
(Fig.
29).
Fig. 27
Fig. 28
TURNTABLE
MOTOR
Fig. 29

NN-6207, NN-6307, NN-6407
NN-6507, NN-6567, NN-6607, NN-6757
NN-6707, NN-6807
COMPONENT TEST PROCEDURE
CAUTION
1.
High
voltage
is
present
at
the
high
voltage
terminal
of
the
high
voltage
transformer
during
any
cook
cycle.
2.
{tis
neither
necessary
nor
advisable
to
attempt
measurement
of
the
high
voltage.
3.
Before
touching
any
oven
components,
or
wiring,
al-
ways
unplug
the
oven
from
its
power
source
and
dis-
charge
the
high
voltage
capacitor.
(See
page
14.)
FILAMENT
WINDING
TERMINALS
SECONDARY
<1 . WINDING
PRIMARY
.
TERMINALS
WINDING
TERMINALS
1.
High
voltage
transformer
(See
Fig.
30)
(A)
Remove
connections
from
the
transformer
terminals
and
check
con-
tinuity.
(B)
Normal
(cold)
resistance
readings
should
be
as
follows:
:
Secondary
Winding
.......ssssssecseeesseeseeees
Approx.
802
~120Q
Fig.
30
Filament
WINdiNG......sessesseeesssseeeseeeeeweeres
Approx.
00
Primary
Winding
......ssssececsessnreneneeeeesenees
Approx.
0Q~
1Q
2.
High
voltage
capacitor
(A)
Check
continuity
of
capacitor
with
meter
on
highest
OHM
scale.
(B)
A
normal
capacitor
will
show
continuity
for
a
short
time,
and
then
indi-
cate
9MQ
once
the
capacitor
is
charged.
(C)
A
shorted
capacitor
will
show
continuous
continuity.
(D)
An
open
capacitor
will
show
constant
9MQ.
(E)
Resistance
between
each
terminal
and
chassis
should
be
infinite.
3. Diode
(A)
Isolate
the
diode
from
the
circuit
by
disconnecting
the
leads.
S
FILAMENT
(B)
With
the
ohmmeter
set
on
the
highest
resistance
scale,
measure
the
c
TERMINALS
resistance
across
the
diode
terminals.
Reverse
the
meter
leads
and
again
;
observe
the
resistance
reading.
Meter
with
6V,
9V
or
higher
voltage
batteries
should
be
used
to
check
the
front-to-back
resistance
of
the
Fig.
31
diode,
otherwise
an
infinite
resistance
may
be
read
in
both
directions.
A
normal
diode’s
resistance
will
be
infinite
in
one
direction
and
several
hundred
kQ
in
the
other
direction.
4.
Magnetron
(See
Fig.
31)
Continuity
checks
can
only
indicate
an
open
filament
or
a
shorted
mag-
netron.
To
diagnose
for
an
open
filament
or
shorted
magnetron.
(A)
lsolate
magnetron
from
the
circuit
by
disconnecting
the
leads.
(B)
A
continuity
check
across
magnetron
filament
terminals
should
indicate
one
ohm
or
less.
(C)
A
continuity
check
between
each
filament
terminal
and
magnetron
case
should
read
open.
5.
Membrane
key
board
(Membrane
switch
assembly)
Check
continuity
between
switch
terminals,
by
tapping
an
appropriate
pad
on
the
key
board.
The
contacts
assignment
of
the
respective
pads
on
the
key
board
is
as
shown
in
Fig.
32A
and
328.
OVEN CHASSIS
ANTENNA
aaa : NN-6707
a
| COOK-WARM | = -—— [| = — |
FROZ-COOK-WARM| == ——__|_ TEMP PROBE. |
io Seer ees pee
LOCK
7[ AS. COOK | AS.COoK [ — |
[Y FROZ-GOOK: |) = =
| MORE [| MORE |
1[_ DEFROST | DEFROST [DEFROST | _FRZ-CO0K |
[12| STAND/TIMER | STAND/TIMER | STAND/TIMER [~ WESHST DEF |
13] STOP/RESET | STOP/RESET | STOP/RESET | AUD START |
a
AUTO
2 1
MEAT PASTRY
STOP/ 3
START RESET [CASSEROLE
ane

NN-6207,
NN-6307,
NN-6407
NN-6507,
NN-6567,
NN-6607,
NN-6757
NN-6707,
NN-6807
6.
Humidity
Sensor
and
digital
programmer
circuit
(Fig.
33)
CAUTION
Do
not
touch
any
parts
of
the
circuitry
on
the
digital
programmer
circuit
since
static
electric
discharge
may
damage this control panel.
Always
ground
yourself
while
working
on
this
panel
to
discharge
any
static
charge
built
up
on
your
body.
(A)
Check
across
sensor
heater
terminals.
Normal
cold
resistance
should
read
approx.
6
ohm.
(B)
in
order
to
determine
if
the
Auto
Sensor
function
of
the
digital
program-
.
mer
circuit
is
in
working
order
or
not,
do
the
following
test.
1)
Place
a
water
load
in
the
oven.
2)
Unsolder
red
and
violet
wires
connected
to
sensor
terminals.
3)
Tap
Auto
Sensor
Cook
Control
Pad
once
for
set
Auto
Sensor
Cooking
at
Ai
and
tap
Start
Pad.
4)
About
10
seconds
after
Start
Pad
is
tapped
short
red
and
violet
wires
for
5
seconds
and
then
remove
them.
Before
shorting
the
red
and
violet
wires
you
can
watch
the
sensor
heater
glow
red.
5)
The
oven
lamp
will
dim
a
little,
about
50
seconds
after
the
Start
Pad
is
tapped.
This
indicates
that
magnetron
has
started
oscillation.
6)
10
seconds
after
magnetron
oscillation,
short
the
shielded
wires
again.
The
oven
should
tum
off
automatically
when
the
red
and
violet
wires
are
shorted.
The
Auto
Sensor
function
in
the
digital
programmer
circuit
is
in
working
order
if
above
condition
is
obtained.
7.
To
test
the
sensor
probe’s
thermistor
Fill
a
container
partially
with
lukewarm
water
and
place
a
thermometer
in
it.
Then
take
the
sensor
probe
out
of
the
oven
and
place
it
in
the
container
next
to
the
thermometer
so
they
will
both
sense
the
exact
same
temperature.
Now
take
another
container
with
boiling
hot
water
and
gradually
pour
this into
the
first
container
to
achieve
graduated
temperature
steps.
At
each
temperature
step
listed
in
the
chart
(Fig.
34),
you
should
read
the
approximate
corresponding
resistance
with
an
ohm-
meter.
If
not,
the
probe
is
defective
and
should
be
replaced.
NOTE:
Of
cource
all
of
the
above
steps
are
very
dependent
upon
the
accuracy
of
the
ohmmeter,
thermometer,
and
human
error.
Please
take
these
factors
carefully
into
consideration
before
determining
if
the
probe
is
defective.
8.
Variable
power
controller
(Fig.
35)
(A)
Isolate
variable
power
switch
from
the
circuit
by
disconnecting
2
leads.
(B)
In
order
to
check
if
variable
power
controller
is
operating
normally,
follow
the
test
procedures
below.
(1)
Select-any
power
other
than
“High”
and
start
the
oven.
(2)
Check
continuity
between
both
terminals
of
the
variable
power
switch.
(3)
Variable
power
controller
(timer
and
variable
power
switch)
is
work-
ing
properly
if
the
ohm
meter
reads
open
and
0
ohm
within
22
+
2
seconds
interval
as
shown
in
Fig.
3
on
page
9.
HUMIDITY SENSOR
SENSOR
TERMINALS HEATER
TERMI NALS
Fig. 33
Thermistor * Thermistor
Resistance Resistance
Nominal (C) Nominal
{kQ)
VARI ABLE
Fig. 35