Panasonic NN-K105WB BPQ User manual

NN-K105WB BPQ
NN-K105WB EPG
NN-K135MB EPG
NN-K105WB WPG
NN-K135MB WPG
© 2005 Matsushita Electric (UK)Ltd.
All rights reserved. Unauthorized copying and
distribution is a violation of law.
Power Requirement
Power Output
Microwave Frequency
Magnetron
Timer
Outside Dimensions
Cavity Dimensions
Net Weight
Shipping weight
Specifications subject to change without notice.
230 Volts AC 50 Hz
Microwave 1100 Watts
Grill 1000 Watts
Combi 2050 Watts
Single phase, 3 wire grounded
800 Watts full microwave power (IEC60705)
2450 MHz
2M167B - M47J1
0 ~ 60 min.
455 (W) x 260 (H) x 325 (D) mm
315 (W) x 184 (H) x 294 (D) mm
11.5 kg (approx.)
12.5 kg (approx.)
Specifications
P/NO : 3828W5S5181

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
SPECIFICATIONS
----------------------------------------------------------------------------------------------------- 1-1
CAUTIONS
-------------------------------------------------------------------------------------------------------------- 2-1
INSTALLATIONS
------------------------------------------------------------------------------------------------------ 3-1
OPERATING INSTRUCTIONS
------------------------------------------------------------------------------------ 4-1
FEATURES ----------------------------------------------------------------------------------------------------------------------- 4-1
CONTROL PANEL
------------------------------------------------------------------------------------------------------------- 4-1
OPERATING SEQUENCE
--------------------------------------------------------------------------------------------------- 4-2
SCHEMATIC DIAGRAM
------------------------------------------------------------------------------------------------------ 4-3
CIRCUIT DESCRIPTION
----------------------------------------------------------------------------------------------------- 4-4
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 & REPLACEMENT PARTS LISTS INFORMATION ----------------------------- 6-0
Section A EXPLODED VIEW
------------------------------------------------------------------------------------ 6 -1
Section A REPLACEMENT PARTS
--------------------------------------------------------------------------- 7-1
Section B EXPLODED VIEW ---------------------------------------------------------------------------------- 8-1
Section B REPLACEMENT PARTS ------------------------------------------------------------------------------- 9-1

POWER LEVEL & ACCESSORIES
1-1
This microwave oven is designed for household use only.
It is not recommended for commercial purposes.
DESCRIPTION
Microwave Power for Variable Cooking
Power level
High Max
Medium 600W
LOW 360W
Defrost c Defrost
Warm 90W
Grill Grill
Combi Combi
Owner's manual
Glass turntable
Roller Rest
Grill rack
ITEM
Control Complement
Rating Label Location
Accessories
Back Side

• 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 stop, 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.
• DO NOT touch any parts of the control panelcircuit. A
resulting static electric discharge may damage this
P.C.B.
• 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.
2-1
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.
Gasket
ANTENNA
COOLING FIN
MAGNETRON
CHASSIS GROUND
FILAMENT
TERMINALS
MAGNETRON

3-1
INSTALLATIONS
INSTALLING
1. Empty the microwave oven and clean inside it with
a soft, damp cloth. Check for damage such as
misaligned door, damage around the door or dents
inside the cavity or on the exterior.
2. Put the oven on a counter, table, or shelf that is
strong enough to hold the oven and the food and
utensils you put in it. (The control panel side of the
oven is the heavy side. Use care when handling.)
3. Do not block the vent and the air intake openings.
Blocking vent or air intake openings can cause
damage to the oven and poor cooking results.
Make sure the microwave oven legs are in place to
ensure proper air flow.
4. The oven should not be installed in any area where
heat and steam are generated, because they may
damage the electronic or mechanical parts of the
unit.
Do not install the oven next to a conventional
surface unit or above a conventional wall oven.
5. Use microwave oven in an ambient temperature
less than 104°F(40°C).
6. Place the microwave oven on a sturdy and flat
surface at least 10 cm(4 inches) from the wall.
7. Place the microwave oven as far away as possible
from TV, RADIO, COMPUTER, etc., to prevent
interference.
EARTHING INSTRUCTIONS
This microwave oven is designed to be used in a fully
earthed condition.
It is imperative, therefore, to make sure it is properly
earthed before servicing
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.
10cm
The wires in this mains lead are colored in
accordance with the following code:
Green-and-yellow: Earth
Blue: Neutral
Brown: Live

FEATURES
CONTROL PANEL
Roller Rest
Safety Door Lock System
Window Door Screen
Door Seal
Grill rack
Turntable
Control Panel
Oven Front Plate
4-1
OPERATING INSTRUCTIONS
NN-K105WBNN-K105WB (UK) NN-K135MB
1. POWER CONTROL KNOB: Used to select power level for cooking.
2. TIMER KNOB: Used to set the cooking time.

4-2
OPERATING SEQUENCE
MICROWAVE COOKING
1. Open the oven door, place the food on the turntable in
the oven, and close the oven door.
2. Set the microwave power selector to the desired
power level. There are five power levels from 90W to
MAX. The power selector can be set to any one of
these positions.
3. Set the timer to the desired cooking time. The turntable
begins to rotate and cooking starts. At the end of
cooking time you will a single ring sound, and the
lamp is turn off.
NOTE:
• Each number represents minutes. To ensure accurate
timing, it is advisable to turn the timer knob slightly
passed the desired cooking time and then back to the
proposed setting.
• Press the door opener to check the cooking condition
during oven operation. Opening the door during oven
operation automatically turns off the oven and stops the
timer. If cooking is to continue, close the door. Cooking
will be resumed until the full cooking time has elapsed.
GRILL COOKING
1. Open the oven door, place the food on the rack in
the oven, and close the oven door.
2. Set the function.
3. Set the timer to the desired cooking time. The
turntable begins to rotate, cooking starts, and the
lamp is turned on. At the end of the cooking time
you will hear a ring sound and the lamp is turned
off.
COMBI COOKING
1. Open the oven door, place the food on the rack in
the oven, and close the oven door.
2. Set the function.
3. Set the timer to the desired cooking time. The
turntable begins to rotate, cooking starts, and the
lamp is turned on. At the end of the cooking time
you will hear a ring sound and the lamp is turned
off.
• Refer to the note under MICROWAVE COOKING
if you want to check the cooking condition.
• Don’t touch the front screen of the door during grill &
combi operation, because the temperature of the
glass may rise to up to 100°C. Prevent children from
touching the front screen!
• When the grill & combi is operated for the first time
after purchasing the oven, slight smoke and smell
may occur. These will soon disappear.
POSITIONS
High Max
Medium 600W
LOW 360W
Defrost c Defrost
Warm 90W
Grill Grill
Combi Combi

CIRCUIT DESCRIPTION
• As the door is closed, the contact of MONITOR
SWITCH opens. This switch creates the short circuit to
blow fuse during operation under abnormal condition.
(ie, should the contacts of primary and secondary
switch fail to open the circuit)
• The latches are secured by latch board. The oven light
turns on while the oven is in operation.
WHEN MICROWAVE POWER LEVEL
AND COOKING TIME SET
• The contacts of the timer switch changes to ON
position when the timer knob is rotated.
(While power control knob is set at “Full Power”)
• The contacts of primary and secondary switch close
the circuit.
• Input Volts AC. is applied to the high voltage
transformer through power control switch as shown by
the solid line
• Turntable rotates.
• The fan motor rotates and cools the magnetron by
blowing the air (coming from the intake holes on the
baseplate) over the magnetron.
• The air is also directed into the oven to exhaust the
vapor in the oven through the upper plate.
• Timer starts rotating.
• 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
diode and charging of the high voltage capacitor.
The negative DC voltage is then applied to the filament
of the magnetron.
WHEN THE DOOR IS OPENED DURING
COOKING
• Both primary switch and secondary switch open to cut
off the primary winding voltage to the high voltage
transformer to stop microwave oscillation.
• Timer, turntable and fan motor stop.
• As the door is opened, if the contact of primary switch
and secondary switch fail to open, the fuse opens due
to the large current surge caused by the monitor switch
activation which in turn stops magnetron, oscillation.
WHEN THE GRILL COOKING FUNCTION
SELECTED
• The contacts of the timer switch change to ON
position.
• The contacts of the grill select switch close the circuit.
• Input volts AC is applied to the grill heater through
thermostat-grill as shown by the solid line.
• The fan motor and turntable rotates.
4-4
FUSE
PRIMARY
SWITCH
SECONDARY
SWITCH
MONITOR
SWITCH
MONITOR
RESISTOR
L
N
H.V.T
RELAY
TIMER
SWITCH
POWER
CONTROL
SWITCH
FUSE
SECONDARY
SWITCH
MONITOR
SWITCH
MONITOR
RESISTOR
L
N
H.V.T
RELAY
PRIMARY
SWITCH TIMER
SWITCH POWER
CONTROL
SWITCH
PRIMARY
SWITCH TIMER SWITCH
GRILL
SELECT
SWITCH
L
N
THERMOSTAT
GRILL
GRILL
HEATER
L
G -Y
N
E

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
Microwave Leakage Test
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
5 mW/cm
2
. Always start measuring of an unknown field
to assure safety for operating personnel from radiation
leakage.
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)
MEASURING MICROWAVE ENERGY
LEAKAGE
• Pour 275±15 cc 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 2,450 MHz and
use it following the manufacturer's recommended
test procedure to assure correct result.
• When measuring the leakage, always use the 2-inch
(5 cm)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
(1 in/sec)
5-1
SERVICE INFORMATION
TOOLS AND MEASURING INSTRUMENTS