Panasonic NN-C69KSMEPG User manual

Microwave Oven
s
© Panasonic Corporation 201
copying and distribution is a violation of law
Model No.
NN-C69KSMEPG
Power Requirement
Power Output
Microwave Frequency
Magnetron
Timer
Outside Dimensions
Cavity Dimensions
Net Weight
Shipping weight
Specications subject to change without notice.
2,450 MHz
0 ~ 9
W) x (H) x
(W) x (H) x 351(D) mm
2M319J
(
Grill
230 Volts AC 50 Hz
Microwave 1500W
520(D) mm
Convection 2
1
2400W
400W
1000 Watts full microwave power
9.5 kg (approx.)
20.7 kg (approx.)
327 520
351
240.5
9 Unauthorized
30L
0 min
Order No. PMUK19100002C2

This device is to be serviced only by properly qualified service personnel.
Consult the service manual for proper service procedures to assure continued safety operation and for precautions to be
taken to avoid possible exposure to excessive microwave energy.
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 the door open.
B) Make the following safety checks on all ovens to be serviced before activating the magnetron or other
microwave source, and make repairs as necessary; (1) interlock operation, (2) proper door closing, (3)
seal and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and
latches, (5) evidence of dropping or abuse.
C) Before turning on microwave power for any service test or inspection within the microwave generating
compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment,
integrity, and connections.
D) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation
and transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual
before the oven is released to the owner.
E) A microwave leakage check to verify compliance with the Federal Performance Standard should be
performed on each oven prior to release to the owner.
SAFETY PRECAUTIONS
CAUTION
MICROWAVE RADIATION
DO NOT BECOME EXPOSED TO RADIATION FROM THE MICROWAVE GENERATOR
OR OTHER PARTS CONDUCTING MICROWAVE ENERGY.

CONTENTS
(Page)
SAFETY PRECAUTIONS --------------------------------------------------------------------- Inside front cover
CAUTIONS
-------------------------------------------------------------------------------------------------------------- 2-1
INSTALLATIONS
------------------------------------------------------------------------------------------------------ 3-1
OPERATING INSTRUCTIONS
------------------------------------------------------------------------------------ 4-1
FEATURES ----------------------------------------------------------------------------------------------------------------------- 4-1
CONTROL PANEL
------------------------------------------------------------------------------------------------------------- 4-1
OPERATING SEQUENCE
--------------------------------------------------------------------------------------------------- 4-3
SCHEMATIC DIAGRAM
------------------------------------------------------------------------------------------------------ 4-4
CIRCUIT DESCRIPTION
----------------------------------------------------------------------------------------------------- 4-5
SERVICE INFORMATION ------------------------------------------------------------------------------------------ 5-1
TOOLS AND MEASURING INSTRUMENTS -------------------------------------------------------------------------- 5-1
MICROWAVE LEAKAGE TEST
-------------------------------------------------------------------------------------------- 5-1
MEASUREMENT OF MICROWAVE POWER OUTPUT
----------------------------------------------------------- 5-3
DISASSEMBLY AND ADJUSTMENT
------------------------------------------------------------------------------------ 5-3
INTERLOCK CONTINUITY TEST
----------------------------------------------------------------------------------------- 5-7
COMPONENT TEST PROCEDURE
-------------------------------------------------------------------------------------- 5-8
TROUBLE SHOOTING
----------------------------------------------------------------------------------------------------- 5-12
EXPLODED VIEW ----------------------------------------------------------------------------------------------------- 6-1
REPLACEMENT PARTS LIST
------------------------------------------------------------------------------------ 7-1
SCHEMATIC DIAGRAM OF P.C.B.
------------------------------------------------------------------------------ 8-1
POWER LEVEL AND ACCESSORIES
-----------------------
-------------------- -----------------------
1-1
------

1-1
POWER LEVEL & ACCESSORIES
This microwave oven is designed for household use only.
It is not recommended for commercial purposes.
DESCRIPTIONITEM
Control Complement
Rating Label Location
Accessories
Microwave Power for Variable Cooking
Power level
CombiCombi
Grill Tray
Roller Ring
Rack
Instruction manual
470 Watts
Max
Defrost
Medium
Low
Warm
in
270 Watts
750 Watts
100 Watts
Glass Tray
1000 Watts

2-1
• DO NOT operate on a 2-wire extension cord during
repair and use.
• NEVER TOUCH any oven components or wiring during
operation.
• BEFORE TOUCHING any parts of the oven, always
remove the power plug from the outlet.
• For about 30 seconds after the oven stops, an electric
charge remains in the high voltage capacitor. When
replacing or checking, you must discharge the high
voltage capacitor by shorting across the two terminals
with an insulated screwdriver.
• Remove your watches whenever working close to or
replacing the Magnetron.
• NEVER operate the oven with no load.
• NEVER injure the door seal and front plate of the oven
cavity.
• NEVER put iron tools on the magnetron.
• NEVER put anything into the latch hole and the
interlock switches area.
• Proper operation of the microwave oven requires that
the magnetron be assembled to the waveguide and
cavity. Never operate the magnetron unless it is
properly installed.
• Be sure that the magnetron gasket is properly
installed around the dome of the tube whenever
installing the magnetron.
CAUTIONS
Unlike other appliances, the microwave oven is
high-voltage and high-current equipment.
Though it is free from danger in ordinary use,
extreme care should be taken during repair.
THE OVEN IS TO BE SERVICED ONLY
BY PROPERLY QUALIFIED SERVICE
PERSONNEL.
MICROWAVE RADIATION
Personnel should not be exposed to the
microwave energy which may radiate from the
magnetron or other microwave generating
device if it is improperly used or connection.
All input and output microwave connections,
waveguide, flange and gasket must be secure
never operate the device without a microwave
energy absorbing load attached.
Never look into an open waveguide or antenna
while the device is energized.
ANTENNA
COOLING FIN
MAGNETRON
CHASSIS GROUND
FILAMENT
TERMINALS
MAGNETRON
GASKET

3-1
INSTALLATIONS
INSTALLING EARTHING INSTRUCTIONS
WARNING-
THIS APPLIANCE
MUST BE EARTHED
IMPORTANT
As the colors of the wires in the mains lead of this
appliance may not correspond with the colored
markings identifying the terminals in your plug,
proceed as follows.
The wire which is colored green-and-yellow must be
connected to the terminal in the plug which is marked
with the letter Eor by the earth symbol ( ) or
colored green or green-and-yellow.
The wire which is colored blue must be connected to
the terminal in the plug which is marked with the letter
Nor colored black.
The wire which is colored brown must be connected
to the terminal in the plug which is marked with the
letter Lor colored red.
BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY.
The wires in this mains lead are colored in
accordance with the following code:
Green-and-yellow: Earth
Blue: Neutral
Brown: Live
IMPORTANT: THIS UNIT HAS TO BE
PROPERLY EARTHED FOR PERSONAL
SAFETY.
If your AC outlet is not grounded, it is the
personal responsibility of the customer to have it
replaced with a properly grounded wall socket.
Examine your microwave oven
Unpack the oven, remove all packing material,
and examine the oven for any damage such
as dents, broken door latches or cracks in
thedoor.Ifyoundanydamage,notifyyour
dealer immediately. Do not install a damaged
microwave oven.
Placement of the Oven
1. This oven is intended for Household counter
top use only. It is not intended for built-in use
or for use inside a cupboard. Place the oven
onaatandstablesurfacemorethan85cm
abovetheoor.
2. When this oven is installed, it should be easy
to isolate the appliance from the electricity
supply by pulling out the plug or operating a
circuit breaker.
3. Forproperoperation,ensureasufcientair
circulation for the oven.
Counter-top use:
a. Allow 15 cm of space on the top of the
oven, 10 cm at the back, 5 cm on one
side, and the other side must be opened.
b.Ifonesideoftheovenisplacedushto
a wall, the other side or top must not be
blocked.

4-1
OPERATING INSTRUCTIONS
FEATURES
CONTROL PANEL
2
6
8
7
13 12
5311 4 3 5
10
9
1
14 15 16
1. Door handle
2. Oven window
3. Air vents
4. Microwave feed guide
(Do not remove.)
5. External air vents
6. Control panel
7. Power supply cord
8. Plug
9. Glass tray
10. Roller ring
11. Grill elements
12. Convection heater
13. Position your supplied auto
programme menu label.
14. High wire rack
15. Low wire rack
16. Grill pan
9
4
6
8
2
1
7
10
5
3
• Your control panel may have
differences in appearance, but the
words and functionality will be the
same.
1 Display window (page 16)
When the oven is rst plugged in,
“88.88” appears in display window.
2 Convection/Grill button
3 Microwave button
4 Combination button
5 Auto Programme button
6 Timer / Clock button
7 Quick 30 button
8 Dial
The dial has the following functions:
Selecting values
Select the setting value of each
manual cooking mode and each
AUTO PROGRAMME.
Cooking time
After selecting a manual cooking
mode, enter time by turning the
dial. Use the dial for the ADD TIME
feature (page 32).
Auto Programmes
After pressing Auto Programme,
turn the dial to select AUTO
PROGRAMMES.
Conrmation
Press the dial to conrm the setting.
CONFIRM indicator ashes
when the setting needs to be
conrmed.
9 Stop / Reset button
Before Cooking:
One press clears your instructions.
During Cooking:
One press temporarily stops the
cooking programme. Another press
cancels all your instructions and the
time of day will appear in the
display.
10 Start button
One press allows oven to begin
functioning. If door is opened or
Stop/Reset is pressed once during
oven operation, Start must be
pressed again to restart oven.
Beep sound
When a button is pressed correctly a
beep will be heard. If a button is
pressed and no beep is heard, the unit
has not or cannot accept the
instruction. The oven will beep twice
between programmed stages and at
the point to stirring or turning the food
in the AUTO PROGRAMME. After the
completion of the preheating on
CONVECTION or COMBINATION
mode, three beeps sound. At the end
of any complete programme, the oven
will beep 5 times and “End” will be
displayed.
Note
If Start is not pressed for 6 minutes
after cooking programme setting, the
oven will automatically cancel the
cooking programme. The display will
revert back to clock or colon.

4-3
The following is a description of component functions
during oven operation.
OPERATING SEQUENCE
Using this system will make the oven inoperable; however,
the door can be opened.Child Lock can be set when the
display shows a colon or the time.
waiting state, press "STOP/CLEAR" for 3 seconds,
e will be a long "beep"
children-lock state and " " indicator will light.
will current time or 0:00.
screen display
ther denoting entering into the
The
In
will be a long "beep"
Lock
Unlock
locked state, press "STOP/CLEAR" for 3 seconds, there
denoting that the lock is released,
and " " indicator will disappear.
(1) The buzzer will sound once when turning the knob
.
(2) "START/+30 SEC./CONFIRM" must be pressed again
if the door is opened during cooking.
(3) Once the cooking programmer has been set and
ART/+30 SEC./CONFIRM" is not
The current time will be displayed.
The setting will be
(4) The buzzer sounds once by efficient press, ine
press will give no response
.
(5) The buzzer will sound five times to remind you when
at the beginning
"ST pressed in 5 minutes.
fficient
cooking is finished.
cancelled.
1. Microwave Cooking
screen
will display "P100".

Press "Micro/Grill/Conv./Combi" once, the
choose the power
Press "Micro/Grill/Conv./Combi" repeatedly to
Then press "START/+30SEC./CONFIRM"toconrm,
turn" " to adjust the cooking time.
Press "START/+30SEC./CONFIRM" again to start cooking.
2. Grill or Combi. Cooking
screen
will display "P100".
Press "Micro/Grill/Conv./Combi" once, the
Press "Micro/Grill/Conv./Combi" repeatedly or turn
the " " to choose the mode
Then press "START/+30SEC./CONFIRM" to conrm,
turn" " to adjust the cooking time.
Press "START/+30SEC./CONFIRM" again to start cooking.
3. Convection Cooking
Press the "Micro/Griil/Conv./Combi"key once.
Keep pressing "Micro/Griil/Conv./Combi" or turn " "
to select the convection temperature.
Press the "START/+30SEC./CONFIRM"toconrm.
Turn " " to adjust the cooking time.
Press the "START/+30SEC./CONFIRM" to start cooking.
4. Multi-StageCooking
Press " "
urn " " to adjust the defrost time
" several times to choose
power "displays;
Press "START/+30SEC./CONFIRM" to confirm;
urn " " to adjust the cooking time of 7 minutes;
Press " START/+30SEC./CONFIRM" to
start cooking.
Micro/Grill/Conv./Combi
Micro/Grill/Conv./Combi
Grill G-1"
and
s "START/+30SEC./CONFIRM" to confirm
T
Press "
T
Pres
repeatedly to choose
the power
;;
;
Speedy Cooking
5.
Child Lock
6.
7. Specification
In waiting state, press "START/+30SEC./CONFIRM"
to cook with 100% power level for 30 seconds.
cooking time can be
During microwave, grill, convection and combination
states,
".
START/+30SEC./CONFIRM increased by pressing "
Turn " " to choose the cooking time directly.
Press " "
START/+30SEC./CONFIRM
cooking with full power. to start

The following is a description of component functions
during oven operation.
OPERATING SEQUENCE
Press
Microwave. Turn the dial to
set the power
level.
Press the dial
to conrm the
setting.
Turn the dial to
set the cooking
time.
Press Start.
1. Microwave Cooking
2. Grill Cooking
Press Convection/
Grill twice to select
GRILL mode.
Press the dial
to conrm the
setting.
Turn the dial to
set the power
level.
Press the dial
to conrm the
setting.
Turn the dial to
set the cooking
time.
(up to 9 hours)
Press Start.
3. Convection Cooking
Press Convection/
Grill once to select
CONVECTION
mode.
Press the dial
to conrm the
setting.
Turn the dial to
set the
temperature.
Press the dial
to conrm the
setting.
After the
preheating
(beep 3 times),
open the door
and place the
food in the
oven.
Press Start to
start
preheating.
Turn the dial to
set the cooking
time.
(up to 9 hours)
Press Start.
Press Convection/
Grill once to select
CONVECTION
mode.
Press the dial
to conrm the
setting.
Turn the dial to set
the temperature.
(40 °C,100-220 °C)
Press the dial
to conrm the
setting.
Turn the dial to set
the cooking time.
(up to 9 hours)
Press Start.
The time counts down in the
display.
(100-220 °C)
With preheating
Without preheating
4. Combi. Cooking
Press
Combination. Turn the dial to select the suitable level in
the chart above.
The indicators
corresponding to the
COMBINATION level
ash.
Press the dial
to conrm the
setting.
Press Start to
start preheating.
The “P” lights up
in the display
while preheating.
After the
preheating (beep
3 times), open the
door and place
the food in the
oven.
Turn the dial to
set the cooking
time.
(up to 9 hours)
Press Start.
The cooking programme will
start and the time in the display
will count down.
Press
Combination. Turn the dial to select the suitable level in the
chart on page 27.
The indicators
corresponding to the
COMBINATION level
ash.
Press the dial
to conrm the
setting.
Turn the dial to
set the cooking
time.
(up to 9 hours)
Press Start.
The time counts down in the
display.
With preheating
Without preheating
Multi-StageCooking
5.
4-3
Press
Microwave. Turn the dial until 750
appears in the
display.
Press the dial
to conrm the
setting.
Turn the dial
until 2.00
appears in the
display.
Press
Combination. Turn the dial until C-2
appears in the
display.
Press the dial
to conrm the
setting.
Turn the dial
until 3.00
appears in the
display.
Press
Convection/
Grill twice to
select GRILL.
Press the dial
to conrm the
setting.
Turn the dial
until G-1
appears in the
display.
Press the dial
to conrm the
setting.
Turn the dial
until 2.00
appears in the
display.
Press Start.
The time for the rst stage counts
down in the display.

4-4
SCHEMATIC DIAGRAM

4-5
GENERAL DETAILS
• The low voltage transformer supplies the necessary
voltage to the micom controller when power cord is
plugged in.
• When the door is closed, the primary switch is ON, the
secondary switch is ON, and the monitor switch opens
(contact COM and NO).
WHEN SELECTING COOKING POWER
LEVEL AND TIME
• The micom controller memorizes the function you set.
• The time you set appears in the display window.
• Each indicator light turns on to indicate that the stage
has been set.
WHEN TOUCHING THE START PAD
• The coil of the relay is energized by the micom
controller.
• Power input is supplied to the high voltage transformer
through the fuse to the primary switch and relay 5.
• Turntable rotates.
• The fan motor rotates and cools the magnetron by
blowing the air (coming from the intake on the
baseplate)
• The air is also directed into the oven to exhaust the
vapor in the oven through the upper plate.
• Cooking time starts counting down.
• 3.2 volts AC is generated from the filament winding of
the high voltage transformer. This 3.2 volts is applied
to the magnetron to heat the magnetron filament
through two noise preventing choke coils.
• A high voltage of approximately 2100 volts AC is
generated in the secondary of the high voltage
transformer which is increased by the action of the high
voltage diode and charging of the high voltage
capacitor.
• The negative 4,000 Volts DC is applied to the filament
of the magnetron.
WHEN THE OVEN IS SET AT ANY LEVEL
EXCEPT MAXIMUM.
• The micom controller controls the ON-OFF time of relay
power of microwave oven as POWER LEVEL.
(refer to page 1-1)
WHEN THE DOOR IS OPENED DURING
COOKING
• Both the primary switch and relay 5 are cut off primary
winding voltage of the high voltage transformer.
• ON-OFF of relay 5 is coupled electrically with opening
and closing of the secondary switch.
• When the door is opened, the secondary switch is
opened and when the door is closed, the secondary
switch is closed.
• The cooking time stops counting down.
• Relay stops functioning.
• As the door is opened, if the contact of primary switch
and relay 5 and/or secondary switch fails to open, the
fuse opens due to the large current surge caused by
the monitor switch activation, which in turn stops
magnetron oscillation.
WHEN TOUCHING THE START KEY
WITH THE GRILL COOKING FUNCTION
SELECTED
• The contacts of the primary switch and the secondary
switch close the circuit.
• A.C.voltage is applied to the grill heater through grill
thermostat as shown by the solid line.
• Turntable rotates.
• The fan motor rotates.
• The air is also directed into the oven to exhaust the
vapor in the oven through the base plate and upper
plate.
L
N
GRILL
THERMOSTAT
GRILL
HEATER
L
G -Y
N
E
RELAY
L
FUSE
TRANS-
FORMER
RELAY 5
MICOM CONTROLLER
SECONDARY
SWITCH
SWITCH
N
MONITOR
SWITCH
PRIMARY
MONITOR
SWITCH
L
FUSE
RELAY 5
MICOM CONTROLLER
SECONDARY
SWITCH
PRIMARY
SWITCH
N
CIRCUIT DESCRIPTION
TRANS-
FORMER
4
5 by the applied signal to vary the average output

-6
WHEN TOUCHING THE START KEY
WITH THE COOKING
SELECTED
• The contacts of the primary switch and the secondary
switch close the circuit.
• A.C.voltage is applied to the grill heater and convection
• Turntable rotates.
• The fan motor and convection fan motor rotates.
• The air is also directed into the oven to exhaust the
vapor in the oven through the back plate and upper
plate.
4
CONVECTION
FUNCTION
L
N
GRILL
THERMOSTAT
GRILL
HEATER
L
G -Y
N
E
RELAY
THERMOSTAT
CONVECTION
CONVECTION
HEATER
by the solid line.
heater through each thermostat as shown
4
RELAY
3

5-1
CAUTIONS
• Be sure to check microwave leakage prior to
servicing the oven if the oven is operative prior to
servicing.
• The service personnel should inform the
manufacture importer, or assembler of any
certified oven unit found to have a microwave
emission level in excess of 5 mW/cm
2
and should
repair any unit found to have excessive emission levels
at no cost to the owner and should ascertain the cause
of the excessive leakage. The service personnel
should instruct the owner not to use the unit until the
oven has been brought into compliance.
• If the oven operates with the door open, the service
personnel should:
- Tell the user not to operate the oven.
- Contact the manufacturer.
• The service personnel should check all surface and
vent openings for microwave leakage.
• Check for microwave leakage after every servicing.
The power density of the microwave radiation leakage
emitted by the microwave oven should not exceed
4 mW/cm
2
. Always start measuring of an unknown field
to assure safety for operating personnel from radiation
leakage.
MEASURING MICROWAVE ENERGY
LEAKAGE
• Pour 275±15cc of 20±5°C(68±9°F) water in a beaker
which is graduated to 600 cc, and place the beaker
on the center of the turntable.
• Set the energy leakage monitor to 2450 MHz and
use it following the manufacturer's recommended
test procedure to assure correct result.
• When measuring the leakage, always use the 2-
inch (5cm) spacer supplied with the probe.
• Operate the oven at its maximum output.
• Measure the microwave radiation using and
electromagnetic radiation monitor by holding the
probe perpendicular to the surface being measured
Move probe along shaded area
Probe scanning speed
Less than 2.5 cm/sec
( 1in/sec)
SERVICE INFORMATION
TOOLS AND MEASURING INSTRUMENTS
MICROWAVE LEAKAGE TEST
NECESSARY TOOLS
Tools normally used for TV servicing are sufficient.
Standard tools are listed below.
• Diagonal pliers
• Long nose pliers
• Phillips screwdriver
• Flat blade screwdriver
• Wrench (size 5mm)
• Nutdriver (size 5mm)
• Adjustable wrench
• Soldering iron
• Solder
• Vinyl insulation tape
• Polishing cloth
NECESSARY MEASURING INSTRUMENTS
• TESTER(VOLTS-DC, AC., Ohmmeter)
• Microwave survey meter
- Holaday HI-1500
HI-1501
- Narda 8100
8200
• Inch scale
• 600 cc non conductive material beaker (glass or plastic),
inside diameter: approx. 8.5 cm(31/2 in.)
• Cylindrical and made of borosilicate glass vessel.
max. thickness: 3 mm
outside diameter: approx. 190mm
height: approx. 90mm
• Glass thermometer: 100°C or 212°F (1 deg scale)

MEASUREMENT WITH OUTER CASE
REMOVED
•When you replace the magnetron, measure for
microwave energy leakage before the outer case is
installed and after all necessary components are
replaced or adjusted.
Special care should be taken in measuring the
following parts. (Circled area of below Fig.)
- Around the magnetron
- The waveguide
MEASUREMENT WITH A FULLY
ASSEMBLED OVEN
•After all components, including the outer case, are fully
assembled, measure for microwave energy leakage
around the door viewing window, the exhaust opening,
and air inlet openings.
•Microwave energy leakage must not exceed the values
prescribed below.
NOTE: Leakage with the outer case removedless than
5 mW/cm2.sq. Leakage for a fully assembled
oven (Before the latch switch (primary) is
interrupted) with the door in a slightly opened
position-less than 2 mW/cm2.sq.
NOTES WHEN MEASURING
•Do not exceed meter full scale deflection.
•The test probe must be removed no faster than
1 inch/sec (2.5 cm/sec) along the shaded area,
otherwise a false reading may result.
•The test probe must be held with the grip portion of the
handle.
A false reading may result if the operator's hand is
between the handle and the probe.
•When testing near a corner of the door, keep the probe
perpendicular to the surface making sure the probe
horizontally along the oven surface, this may possibly
cause probe damage.
RECORD KEEPING AND NOTIFICATION
AFTER MEASUREMENT
•After adjustment and repair of any microwave energy
interruption or microwave energy blocking device,
record the measured values for future reference. Also
enter the information on the service invoice.
•The microwave energy leakage should not be more
than 4 mW/cm2.sq. after determining that all parts are
in good condition, functioning properly and genuine
replacement parts which are listed in this manual have
been used.
•At least once a year, have the electromagnetic energy
leakage monitor checked for calibration by its
manufacturer.
WARNING : AVOID CONTACTING ANY
HIGH VOLTAGE PARTS
5-2

5-3
A. OUTER CASE REMOVAL
1) Disconnect the power supply cord from the outlet.
2) Remove the screws from the rear and along side
edges of the case.
The outer case must be moved backward to be lifted
off.
B. POWER SUPPLY CORD
1) Remove the outer case.
2) Disconnect two terminals, and remove one screw of
the earth terminal.
C. CONTROL PANEL ASSEMBLY
1) Disconnect the leadwire from the PCB SUB ASS’Y.
2) Remove the screws for the earth and securing the
control panel.
3) Lift control panel ASS’Y from the oven by the tab
unhooked.
MEASUREMENT OF MICROWAVE POWER OUTPUT
• Microwave power output measurement is made with
the microwave oven supplied at its rated voltage and
operated at its maximum microwave power setting with
a load of (1000±5) g of potable water.
• The water is contained in a cylindrical borosilicate glass
vessel having a maximum material thickness of 3 mm
and an outside diameter of approximately 190mm.
• The oven and the empty vessel are at ambient
temperature prior to the start of the test.
• The initial temperature (T1) of the water is (10±2)°C. It
is measured immediately before the water is added to
the vessel. After addition of the water to the vessel,
the load is immediately placed on the center of the
turntable which is in thd lowest position and the
microwave power switched on.
• The time T for the temperature of the water to rise by a
value ∆T of (10±2)°K is measured, where T is the time
in seconds and ∆T is the temperature rise. The initial
and final water temperatures are selected so that the
maximum difference between the final water
temperature and the ambient temperature is 5°K.
4187 x (∆T) + 0.55 X (T2- T0) X M
T
• T 2 : Temperature after heating
• T
0 : Temperature of bowl
• M: Weight of bowl
is measured while the microwave generator is
operating at full power. Magnetron filament heat-up
time is not included. (about 3 sec)
• The water is stirred to equalize temperature throughout
the vessel, prior to measuring the final water
temperature.
• Stirring devices and measuring instruments are
selected in order to minimize addition or removal of
heat.
WATER LOAD
TURNTABLE
P =
• The microwave power output P in watts is calculated
from the following formula :
NOTES:
For simple tests of micromave power output,
it by heating one litre water for one minute,
minimum temperature rise should be 7.7 C
°
conduct
DISASSEMBLY AND ADJUSTMENT
CAUTION: DISCHARGE THE HIGH VOLTAGE
CAPACITOR BEFORE SERVICING
(refer to page 2-1)

5-4
D. DOOR ASSEMBLY REMOVAL
1) Open the door.
CAUTION : Be careful not to damage Door C
by screwdriver.
3) Lift up and pull the door.
NOTE:
1. After replacing the door, be sure to check that the
primary switch, monitor switch, and secondary switch
operate normally.
2. After replacing the door, check for microwave energy
leakage with a survey meter. Microwave energy must
be below the limit of 5 mW/cm
2
. (with a 275 ml water
load)
3. When mounting the door assembly to the oven
assembly, be sure to adjust the door assembly parallel
to the chassis. Also adjust so the door has no play
between the inner door surface and oven frame
assembly. If the door assembly is not mounted
properly, microwaves may leak from the clearance
between the door and the oven.
E. HIGH VOLTAGE TRANSFORMER
REMOVAL
1) Discharge the high voltage capacitor.
2) Disconnect the leadwire from magnetron, high voltage
transformer, and capacitor.
3) Remove the screw holding the high voltage
transformer to the baseplate.
F.
1) Discharge the high voltage capacitor.
2) Disconnect the leadwire from fan motor, noise filter
and high voltage capacitor.
3) Remove the two screws holding the orifice
oven cavity and remove the high voltage
earth screw.
4) Remove the screw of the capacitor bracket.
5) Remove the two screws holding the fan motor ASS’Y
to the Orifice
G. HIGH VOLTAGE CAPACITOR AND
DIODE REMOVAL
1) Discharge the high voltage capacitor.
2) Disconnect the leadwire from fan motor, noise filter
and high voltage capacitor.
cavity
and remove the high voltage diode
earth screw.
bracket.
to the Cavity Ass'y.
2) Remove two screws holding the Hinge
3) Remove the screw holding the Orifice
Remove door Assembly
Remove door Assembly
ORIFICE
to the diode
ASSEMBLY REMOVAL
ASS’Y
.
ASS’Y
the oven
to
ASS’Y
4) Remove the screw holding the high voltage capacitor
Remove door Assembly

5-5
H. AIR GUIDE ASSEMBLY REMOVAL
1) Disconnect the leadwire from lamp, A.C Relay and
monitor resistor and magnetron.
2) Remove the screw to the cavity.
I. MAGNETRON REMOVAL
1) Disconnect the leadwire from the high voltage
transformer and high voltage capacitor.
2) Remove the air
3) Carefully remove the mounting screws holding the
magnetron and the waveguide.
4) Remove the magnetron until the tube is
clear from the waveguide.
NOTE:
1. When removing the magnetron, make sure its
dome does not hit any adjacent parts, or it may be
J. REMOVING THE TURNTABLE MOTOR
1) Remove the glass tray.
2) Remove the pulley shaft VERY CAREFULLY
3) Lay the unit down on its back.
4) Remove the turntable motor cover.
The turntable base cover is easily removed by
pinching the six parts with a wire cutting.
5) Disconnect the leadwire from the turntable motor
terminals.
6) Remove the screw securing the turntable motor to
the oven cavity ASS’Y
7) After rep the motor, rotate the removed
turntable motor cover.
8) Fit the turntable motor cover’s projecting part to the
base plate slit.
NOTE:
1. Remove the wire lead from the turntable motor
VERY CAREFULLY.
Waveguide
Magnetron
Gasket
Magnetron
Dome
Waveguide
Bracket
Magnetron
damaged.
magnetron.
2. When replacing the magnetron, be sure to install
the magnetron gasket in the correct position and
be sure that the gasket is in good condition.
3. After replacing the magnetron, check for microwave
leakage with a survey meter around the
magnetron. Microwave energy must be below the
limit of 5 mW/cm
2
. (With a 275 ml. water load).
Make sure that gasket is rigidly attached to the
To prevent microwave leakage, tighten the
mounting screws properly, making sure there is no gap
between the waveguide and the magnetron.
be sure that the gasket is in good condition.
2
2. Be sure to grasp the connector, not the wires, when
removing
guide
lacing
.

K. PCB ASSEMBLY REMOVAL
1) Remove the control panel assembly from the
cavity.
2) Remove screws which hold the PCB to
control panel.
3) Disconnect the flat cable from the PCB
take off the PCB .
L. INTERLOCK SYSTEM
1) INTERLOCK MECHANISM
The door lock mechanism is a device which has
been specially designed to eliminate completely
microwave activity when the door is opened during
cooking and thus to prevent the danger resulting
from the microwave leakage.
2) MOUNTING OF THE PRIMARY/MONITOR/
SECONDARY SWITCHES TO THE LATCH
BOARD
3) INSTALLATION AND ADJUSTMENT OF THE
LATCH BOARD TO THE OVEN ASSEMBLY
• Mount the latch board to the oven assembly.
• Adjust the latch board in the arrow direction so that
oven door will not have any play in it when the door
is closed.
• Tighten the mounting screw.
• Check for play in the door by pushing the door
release button. Door movement should be less
than 0.5 mm. (1/64 inch)
Don't push the door release button while making
adjustment. Make sure that the latch moves
smoothly after adjustment are completed and that
the screws are tight. Make sure the primary, monitor,
and secondary switches operate properly by
following the continuity test procedure.
5-6
ADJUSTMENT
DIRECTION
the
and
PRIMARY
SWITCH
MONITOR
SWITCH
SECONDARY
SWITCH
Control panel
PCB PCB
PCB

A. PRIMARY INTERLOCK SWITCH TEST
When the door release button is depressed slowly
with the door closed, an audible click should be
heard at the same time or successively at
intervals. When the button is released slowly, the
latches should activate the switches with an
audible click.
If the latches do not activate the switches when
the door is closed, the switches should be a
adjusted in accordance with the adjustment
procedure. Disconnect the wire lead from the
primary switch. Connect the ohmmeter leads to
the common (COM) and normally open (NO)
terminal of the switch. The meter should indicate
an open circuit in the door open condition.
When the door is closed, the meter should
indicate a closed circuit.
When the primary switch operation is abnormal,
make the necessary adjustment or replace the
switch only with the same type of switch.
B. SECONDARY INTERLOCK SWITCH TEST
Disconnect the wire lead from the secondary
switch.
Connect the ohmmeter leads to the common
(COM) and normally open (NO) terminals of the
switch. The meter should indicate a open circuit in
the door open condition. When the door is closed,
meter should indicate an closed circuit. When the
secondary switch operation is abnormal, make the
necessary adjustment or replace the switch only
with the same type of switch.
C. MONITOR SWITCH TEST
Disconnect the wire lead from the monitor switch.
Connect the ohmmeter leads to the common
(COM) and normally closed (NC) terminals of the
switch. The meter should indicate closed circuit in
the door open condition. When the door is closed,
meter should indicate an open circuit. When the
monitor switch operation is abnormal, replace with
the same type of switch.
NOTE: After repairing the door or the interlock
system, it is necessary to do this continuity
test before operating the oven.
5-7
WARNING : FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION
EMISSION, REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS.
COMPONENTS TEST PROCEDURE RESULTS
SWITCHES Check for continuity of the Door Door
(Wire leads removed) switch with an Ohm-meter open closed
Primary
Switch
Monitor
Switch
NOTE : After checking for the continuity of switches, make sure that are
correctly connected.
COM
NO
COM
NC
COM
NO
INTERLOCK CONTINUITY TEST
Secondary
Switch
TYPE NO. KW3A FOR SWITCHS
Type No.KW3A
Type No.KW3A
Type No.KW3A

5-8
CAUTIONS
1. DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE
OUTER CASE FROM THE UNIT. PROCEED WITH THE TEST ONLY AFTER DISCHARGING THE HIGH
VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE
HIGH VOLTAGE TRANSFORMER. (SEE PAGE 2-1)
2. ALL OPERATIONAL CHECKS WITH MICROWAVE ENERGY MUST BE DONE WITH A LOAD (1 LITER
OF WATER IN CONTAINER) IN THE OVEN.
COMPONENTS TEST PROCEDURE RESULTS
HIGH VOLTAGE
TRANSFORMER
(Wire leads removed)
MAGNETRON
(Wire leads removed)
1. Measure the resistance.
(Ohm-meter scale: Rx1)
• Primary winding
• Secondary winding
• Filament winding
2. Measure the resistance.
(Ohm-meter scale: Rx1000)
• Primary winding to ground
• Filament winding to ground
1. Measure the resistance.
(Ohm-meter scale: Rx1)
• Filament terminal
2. Measure the resistance.
(Ohm-meter scale: Rx1000)
• Filament to chassis
Approx.: 1.4 ohm
Approx.: 90 ohm
Less than: 1 ohm
Normal: Infinite
Normal: Infinite
Normal: Less than 1 ohm
Normal: Infinite
COMPONENT TEST PROCEDURE
PRIMARY
TERMINAL
SECONDARY
WINDING
FILAMENT
WINDING
TERMINAL