This service manual is intended for use by persons having electrical and mechanical training and a level of
knowledge of these subjects generally considered acceptable in the appliance repair trade. Sharp Electronics
Corporation cannot be responsible, nor assume any liability, for injury or damage of any kind arising from the
use of this manual.
Microwave ovens contain circuitry capable of producing very high voltage and current. Contact with the
following parts may result in a severe, possibly fatal, electrical shock. (High Voltage Capacitor, High Voltage
Power Transformer, High Voltage Rectifier and Heat sink etc., and Magnetron, High Voltage Harness etc..)
TABLE OF CONTENTS
Page
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO
AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY ..................... INSIDE FRONT COVER
BEFORE SERVICING ....................................................................................................... INSIDE FRONT COVER
WARNING TO SERVICE PERSONNEL ................................................................................................................. 3
POWER CONNECTION ....................................................................................................................................... 10
CONTROL LAYOUT ............................................................................................................................................. 13
TEST PROCEDURES .......................................................................................................................................... 18
TOUCH CONTROL PANEL ASSEMBLY .............................................................................................................. 29
PARTS LIST ......................................................................................................................................................... 63
PACKING AND ACCESSORIES .......................................................................................................................... 74
KB-4425LS
KB-4425LK
KB-4425LW
SHARP ELECTRONICS CORPORATION
This document has been published to be used for after sales service only. The contents are subject to change without notice.
1
KB-3425LS/K/W
KB-4425LS/K/W
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 compart-
ments, 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.
BEFORE SERVICING
Before servicing an operative unit, perform a microwave emission check as per the Microwave Measurement Procedure outlined in this service manual.
If microwave emissions level is in excess of the specified limit, contact SHARP ELECTRONICS CORPORATION immediately @1-800-237-4277.
If the unit operates with the door open, service person should 1) tell the user not to operate the oven
and 2) contact SHARP ELECTRONICS CORPORATION and Food and Drug Administration's Center for
Devices and Radiological Health immediately.
Service personnel should inform SHARP ELECTRONICS CORPORATION of any certified unit found with
emissions in excess of 4mW/cm2. The owner of the unit should be instructed not to use the unit until the
oven has been brought into compliance.
2
WARNING TO SERVICE PERSONNEL
Range units contain circuitry capable of producing very high voltage and current, contact
with following parts
(Example)
High Voltage Capacitor, High Voltage Power Transformer, Magnetron, High Voltage Rectifier
Assembly, High Voltage Harness, Heating Elements, etc..
Read the Service Manual carefully and follow all instructions.
Before Servicing
1. Disconnect the power supply cord , a n d t hen
remove cabinet.
2. Open the drawer and keep it open.
3. Discharge high voltage capacitor.
WARNING: RISK OF ELECTRIC SHOCK.
DISCHARGE THE HIGH-VOLTAGE
CAPACITOR BEFORESERVICING.
may result in a severe, possibly fatal, electrical shock.
KB-3425LS/K/W
KB-4425LS/K/W
When the testing is completed,
1. Disconnect the power supply cord, and then remove
covers.
2. Open the drawer and keep it open.
3. Discharge high voltage capacitor.
4. Reconnect the leads to the primary of the power
transformer.
5. Reinstall the covers.
6. Reconnect the power supply cord.
7. Run the unit and check all functions.
The high-voltage capacitor remains charged about 60
seconds after the oven has been switched off. Wait for
60 seconds and then short-circuit the connection of the
high-voltage capacitor (that is the connecting lead of the
high-voltage rectifier) against the chassis with the use of
an insulated screwdriver.
Whenever troubleshooting is performed the power supply
must be disconnected. It may, in some cases, be necessary
to connect the power supply after the outer case has been
removed, in this event:
1. Disconnect the power supply cord, and then remove
neccessary covers.
2. Open the drawer and keep it open.
3. Discharge high voltage capacitor.
4. Disconnect the leads to the primary of the power
transformer.
5. Ensure that the leads remain isolated from other
components and oven chassis by using insulation tape.
6. After that procedure, reconnect the power supply cord.
After repairing
1. Reconnect all leads removed from components during
testing.
2. Reinstall the covers.
3. Reconnect the power supply cord.
4. Run the oven and check all functions.
Microwave ovens should not be operated empty. To test for
the presence of microwave energy within a cavity, place a
cup of cold water on the oven tray, close the drawer and set
the power to HIGH and set the microwave timer for two (2)
minutes. When the two minutes has elapsed (timer at zero)
carefully check that the water is now hot. If the water remains
cold carry out Before Servicing procedure and re-examine
the connections to the component being tested.
When all service work is completed and the oven is fully
assembled, the microwave power output should be checked
and a microwave leakage test should be carried out.
3
KB-3425LS/K/W
ATTENTION!!!
Thisservicemanual is intendedfor useby persons having electricalandmechanical training
anda level of knowledgeof these subjects generallyconsidered acceptablein the appliance
repair trade. Sharp Electronics Corporation cannot be responsible, nor assume any liability,
for injury or damage of any kind arising from the use of this manual.
SAFE SERVICING PRACTICES
To avoid personal injury and/or property damage, it is important that Safe Servicing
Practices be observed. The following are some limited examples of safe practices:
1. DO NOT attempt a product repair if you have any doubts as to your ability to
complete it in a safe and satisfactory manner.
2. Before servicing or moving an appliance:
•Remove the power cord from the electrical outlet, trip the circuit breaker to the
OFF position, or remove the fuse.
3. Never interfere with the proper operation of any safety device.
4. USE ONLY REPLACEMENT PARTS CATALOGED FOR THIS APPLIANCE.
SUBSTITUTIONS MAY DE F E A T COMPL I A N C E WITH SAFETY
STANDARDS SET FOR HOME APPLIANCES.
5. GROUNDING : The standard color coding for safety ground wires is GREEN, or
GREEN with YELLOW STRIPES . Ground leads are not to be used as current
carrying conductors. It is EXTREMELY important that the service technician
reestablish all safety grounds prior to completion of service. Failure to do so will
create a hazard.
6. Prior to returning the product to service, ensure that:
•All electrical connections are correct and secure
•All electrical leads areproperly dressed and secured away from sharp edges,
•All safety grounds (both internal and external) are correctly and securely
connected
•All panels are properly and securely reassembled
KB-4425LS/K/W
4
KB-3425LS/K/W
KB-4425LS/K/W
MICROWAVE MEASUREMENT PROCEDURE
A. Requirements:
1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave
oven should not exceed 1mW/cm2 at any point 5cm or more from the external surface of the oven, measured prior to
acquisition by a purchaser, and thereafter (through the useful life of the oven), 5 mW/cm2 at any point 5cm or more
from the external surface of the oven.
2) Safety interlock switches:
Primary interlock relay switch shall prevent microwave radiation emission in excess of the requirement as above
mentioned. Secondary interlock relay and door sensing switch shall prevent microwave radiation emission in excess
of
5 mW/cm2 at any point 5cm or more from the external surface of the oven.
B. Preparation for testing:
Before beginning the actual measurement of leakage, proceed as follows:
1) Make sure that the actual instrument is operating normally as specified in its instruction booklet.
Important:
Survey instruments that comply with the requirement for instrumentation as prescribed by the performance standard for
microwave ovens, 21 CFR 1030.10(c)(3)(i), must be used for testing.
2) Place the load of 275±15 ml (9.8 oz) of tap water initially at 20±5
The water container shall be a low form of 600 ml (20 oz) beaker with an inside diameter of approx. 8.5 cm (3-1/2 in.)
and made of an electrically nonconductive material such as glass or plastic.
The placing of this standard load in the oven is important not only to protect the oven, but also to insure that any leakage
is measured accurately.
3) Set the cooking control on Full Power Cooking Mode.
4) Close the drawer and select a cook cycle of several minutes. If the water begins to boil before the survey is completed,
replace it with 275 ml of cool water.
O
C (68OF) in the center of the oven cavity.
C. Leakage test:
Closed-drawer leakage test (microwave measurement):
1) Grasp the probe of the survey instrument and hold it perpendicular to the gap between the drawer and the body of the
oven.
2) Move the probe slowly, not faster than 1 in./sec. (2.5 cm/sec.) along the gap, watching for the maximum indication on
the meter.
3) Check for leakage at the drawer screen, sheet metal seams and other accessible positions where the continuity of the
metal has been breached (eg., around the switches, indicator, and vents).
While testing for leakage around the drawer, pull the drawer away from the front of the oven as far as is permitted by
the closed latch assembly.
4) Measure carefully at the point of highest leakage and make sure that the highest leakage is no greater than 4mW/cm2,
and that the primary interlock switch/secondary interlock relay does turn the oven OFF before any door movement.
This Manual has been prepared to provide Sharp Electronics Corp.
Service Personnel with Operation and Service Information for the
SHARP FREE STANDING and SLIDE-IN RANGE WITH MICROWAVE
DRAWER, KB-3425LS/JK/JW and KB-4425LS/JK/JW
It is recommended that service personnel carefully study the entire
text of this manual so that they will be qualified to render satisfactory
customer service.
Check the interlock switches and the door seal carefully. Special
attention should be given to avoid electrical shock and microwave
radiation hazard.
WARNING
Never operate the oven until the following points are ensured.
(A) The door is tightly closed.
(B) The door brackets and hinges are not defective.
(C) The door packing is not damaged.
(D) The door is not deformed or warped.
(E) There is not any other visible damage with the oven.
PRODUCT DESCRIPTION
POWER CONNECTION
ANTI-TIP DEVICE
SCHEMATICS
TEST PROCEDURE
TOUCH CONTROL PANEL
COMPONENT REPLACEMENT
AND ADJUSTMENT PROCEDURE
WIRING DIAGRAM
Servicing and repair work must be carried out only by trained service
personnel.
DANGER
Certain initial parts are intentionally not grounded and present
a risk of electrical shock only during servicing. Service
personnel - Do not contact the following parts while the appliance is energized;
High Voltage Capacitor, Power Transformer, Magnetron, High
Voltage Rectifier Assembly, High Voltage Harness;
If provided, Vent Hood, Fan assembly, Cooling Fan Motor.
All the parts marked “*” on parts list are used at voltages more
than 250V.
Removal of the outer wrap gives access to voltage above 250V.
All the parts marked “ ” on parts list may cause undue microwave
∆
exposure, by themselves, or when they are damaged, loosened
or removed.
SHARP ELECTRONICS CORPORATION
PARTS LIST
SHARP PLAZA, MAHWAH,
NEW JERSEY 07430-2135
7
KB-3425LS/K/W
KB-4425LS/K/W
OVEN SPECIFICATION
ITEM DESCRIPTION
Power Requirements 120 /208 - 120/240Volts / 46/50 Amperes
60 Hertz
Single phase, 3 wire grounded
DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J
9
KB-3425LS/K/W
208/240 VOLT CONNECTION INSTRUCTIONS
The rangecan be set for 208V or 240V. The voltage settingfor your
range is pre-set at 240V from the factory. Follow these steps to
change the voltage setting.
1 Locate the voltage switch on the lower back side of the
range.
2 Removethe screwandrotate theswitchplate180 as indicated
in the Figure 3.
3 Reinsert the switch plate and replace screw as indicated
in Figure 4. The voltage setting is indicated by the visible
marking.
POWER CORD CONNECTIONS
4-WIRE CONNECTION INSTRUCTIONS-FIGURE 8
Beforewiringtherange,reviewthe suggested powersourcelocation.
Ifconnecting to a 4-wireelectrical system for a
new branch-
circuit or mobile home use a 4-wire connection.
1 Follow the power supply kit manufacturer s Installation
Instructions supplied with the strain relief clamp and install.
See Figure 7.
2 Insert the end connectors for line 1, line 2 and neutral and
tighten securely to the terminal block.
IMPORTANT
DO NOT LOOSEN the factory installed nut
connections which secure the range wiring to the terminal
block. Electrical failure or loss of electrical connection may
occur if these 3 nuts are loosened or removed.
3 You must disconnect the ground strap. Remove the factory
installed ground screw and plate to release the copper ground
strap from the frame of the range. Cut and discard the copper
ground strap and plate. KEEP the ground screw.
4 Connectthegreengroundwireleadwith the eyeletto the frame
of the range with the ground screw using the same hole in the
frame where the ground screw was originally installed. See
Figure 8.
5 Make sure all screws are tightened securely and replace the
rear access cover. See Figure 6.
3-WIRE CONNECTION INSTRUCTIONS
For existing installations ONLY,refer to Figure 9.
1 Follow the power supply kit manufacturer s Installation
Instructions supplied with the strain relief clamp and install.
See Figure 7.
2 Insert the end connectors for line 1, line 2 and neutral and
tighten securely to the terminal block. See Figure 7.
IMPORTANT
DO NOT LOOSEN the factory installed nut
connections which secure the range wiring to the terminal
block. Electrical failure or loss of electrical connection may
occur if these 3 nuts are loosened or removed.
ACCESS TO TERMINAL BLOCK
Loosen screw on rear access cover and pull down as illustrated in
Figure6toaccessterminal blockwiring connection.Toclose,return
to original location and secure screw.
Figure 5A illustrates 4-wire receptacle required for new and
remodeled installations.
Figure 5B illustrates 3-wire receptacle that is allowed for existing
installations.
Figure 5A
4-wire wall receptacle (14-50R)
Figure 5B
3-wire wall receptacle (10-50R)
strain-relief clamp
Figure 7
240V
180
screw
208V
screw
KB-4425LS/K/W
POWER CONNECTION
10
KB-3425LS/K/W
3 Make sure all connections are tightened securely and replace
the rear access cover.See Figure 7.
GROUNDING IN STRUCTIONS - ONLY 3 -WIRE CONNECTION S:
A ground strap is installed on this range which connects the center
terminal of the neutral terminal block to the range chassis. The
ground strap is connected to the range by the center, lowestscrew
SeeFigure9. Theground strapmustnotbe removedunlessNational
State or Local Codes do not permit use of a ground strap.
Note: If the ground strap is removed forany reason, a separate
ground wire must be connected to the separate ground screw
attached to the range chassis and to an adequate ground source
Note: Install strain-relief
clamp. Center or white
wire must always be
attached to the center
terminal on block.
Figure 8
4-WIRE CONNECTION
3-WIRE CONNECTION
Figure 10
ground
screw
ground
wire lead
ground
plate
proper ground for
4-wire permanent
connection
Figure 11
4-WIRE PERMANENT CONNECTION ONLY
FOR 3 & 4-WIRE PERMANENT CONNECTIONS
connections.Tightenall 3 or 4-wire leads to the terminal block.
Followwire locations shown in Figure 10.
IMPORTANT
DO NOT LOOSEN the factory installed nut
connections which secure the range wiring to the terminal
block. Electrical failure or loss of electrical connection may
occur if these 3 nuts are loosened or removed.
Note: For 3-wirepermanentconnection skipsteps 3 and4 and
continue with step 5.
3 Disconnect the ground strap. Remove the factory installed
ground screw and plate to release the factory installed copper
ground strap from frame of the range. Cut and discard the
copperstrap fromthe terminalblock.KEEP theground screw,
ground plate and go to step 4.
4 Connect the green ground wire lead to the frame of the range
usingthe groundscrewand plateas showninFigure11. Be sure
to install using the same hole in the frame where the ground
screw was originally installed.
5 Make sure all connections are tightened securely and replace
the rear access cover.See Figure 7.
Note:Non-terminated fieldwirecompressionconnectionsmust
be set at approximately 90 in./lbs.
terminal
block
ground
screw
ground plate
ground strap
line 2
neutral
line 1
KB-4425LS/K/W
11
KB-3425LS/K/W
2 DRILL PILOT HOLES AND FASTEN BRACKET
Drill a1/8-inch pilot hole where screws are to be located. If bracket
is to be mounted to the wall, drill pilot hole at an approximate 20
degree downward angle. If bracket is to be mounted to masonry or
ceramic floors, drill a5/32-inch pilot hole 13/4-inches deep. The
screws provided may be used in wood or concrete material. Use a
5
/16-inch nut-driver or flat head screwdriver to secure the bracket
in place.
FASTEN BRACKET (WALL OR FLOOR MOUNTING)
FASTEN BRACKET (FLOOR MOUNTING ONLY)
Floor Mount
Floor Mount
Anti-Tip Bracket
Anti-Tip Bracket
Wall
Wall Mount
Wall Plate
More Than
11/4"
Max 11/4"
Leveling Leg
Leveling Leg
3 LEVEL AND POSITION RANGE
Level range by adjusting the (4) leveling legs with a wrench. Note:
A minimum clearance of1/8-inch is required between the bottom
of the range and the leveling leg to allow room for the bracket. Use
a levelto check your adjustments. Plug range into properlyprepared
electrical receptacle or if hard wired, check that it was completed
properly. Check door condition for evenness and stability. Slide
range back into position.
Visuallycheck that rear levelinglegisinserted into and fully secured
by the Anti-Tip bracket by looking underneath the range with a
flashlight and carefully attempt to tilt it forward.
To reduce the risk of tipping of the range, the range must be secured
to the floorby properly installed Anti-Tip bracket and screwspacked
with the range. Failure to install the Anti-Tip bracket will allow the
range to tip over if excessive weight is placed on an open door or if
a child climbs upon it. Serious injury might result from spilled hot
liquids or from the range itself.
If range is ever moved to a different location, the Anti-Tip bracket
must also be moved and installed with the range. Instructions are
provided forinstallationinwoodor cementfastenedto eitherthefloor
orwall.Wheninstalledtothewall,makesurethatscrewscompletely
penetratedry wall and are securedin woodormetal.When fastening
to the floor or wall, be sure that screws do not penetrate electrical
wiring or plumbing.
1 LOCATE THE BR ACKET - USING THE TE MPLATE
The bracket may be located on either the left or right side of the
range. Use the information below to locate the bracket if template
is not available.
Mark the floor or wall where left or right side of the range will be
located. If rear of range is against the wall or no further than 11/4inchesfromwallwheninstalled, youmay use the wall or floormount
method. If molding is installed and does not allow the bracket to fit
push against the wall, removemoldingor mount bracket to the floor.
For wall mount, locate the bracket by placing the back edge of the
template against the rear wall and the side edge of template on the
mark made referencing the side of the range. Place bracket on top
of template and mark location of the screw holes in wall. If rear of
rangeis further than 11/4-inchesfrom the wall wheninstalled, attach
bracket to the floor. For floor mount, locate the bracket by placing
backedgeofthe templatewheretherear of the range will be located.
Mark the location of the screw holes, shown in template.
Figure 18
Figure 15
Figure 16
Figure 17
Range Slide
15/8" to edge
of bracket
KB-4425LS/K/W
KB-3425L Shown
12
KB-3425LS/K/W
KB-4425LS/K/W
KB-3425LS
13
KB-3425LS/K/W
COOK TOP
NOTES:
1. Circuits / wire colors are subject to change without notice.
2. Terminal that is located on the right side on lamp sockets back view
must be connected to neutral wire.
SM
OL
FM
B1
B3
RY1
R
Y2
RY5
HUMIDITY
SENSOR
NOISE SUPRESSION COIL
RESISTOR 470 kohm 1/2W
LINE CROSS CAPACITOR 1.0uF 250V
LINE BYPASS CAPACITOR
0.0033uF 250V
LINE BYPASS CAPACITOR
0.0033uF 250V
FUSE
20A
FAN MOTOR
FM
CLOSS FLOW
FAN MOTOR
OV
EN LAMP
OL
OVEN LAMP
CONV. HEATER
TOP HEATER
MONITOR SWITCH
PRIMARY INTERLOCK
RELAY
RECTIFIERMAGNETRON
POWER TRANSFORMER
CAPACITOR
1.00uF
AC 2300V
STIRRER MOTOR
LM
DOOR LOCK
MOTOR
L
L
N.O.
N.O.
N.O.
COM.
COM.
COM.
N.O.
COM.
C1
E2
E1
RY7
RY4
RY10
RY3
RY8
RY11
CONTROL UNIT
M12
DOOR LOCK
MOTOR
SWITCH
THERMISTOR
M11
M10
M9
M8
M6
N1
N2
N3
N4
N5
M7
M4
DOOR
SWITCH
M5
CONTROL UNIT
OVEN
MICROWAVE DRAWER
SWITCHING POWER SUPPLY UNIT
L1
L2
N
N
L1
L2
2
INSIDE
OUTSIDE
CONTROL
RIGHT FRONT
SURFACE
ELEMENT
44aS2S1
P2
P1
H2 /
2
2a
1a
2
P1 /
4
CONTROL
H1 /
4
P
L1 /
P2
L2 /
P1
H2 /
2
PROTECTOR
CONTROL
INDICATOR LIGHT
INDICATOR LIGHT
HOT SURFACE LIGHT
HOT SURFACE
LIGHT
SWITCHES
H1 /
4
P
L1 /
P2
L2 /
P1
H2 /
2
CONTROL
LEFT REAR
SURFACE
ELEMENT
H1 /
4
P
L1 /
P2
L2 /
P1
1b /
H
RR
LR
RF
LF
2b /
S
1b /
H
2b /
S
1b /
H
2b /
S
1b /
H
2b /
S
OVEN
THERMAL
CUT-OUT
MG
THERMAL
CUT-OUT
CM
RY9
CONV. MOTOR
D1
D5
D3
C3C7
C5
E6E5
E3
RY6
SECONDARY INTELOCK SWITCH
VOLTAGE SWITCH
DM
MICROWAVE DRAWER
DOOR OPEN-CLOSE
MOTOR
DOOR
POSITION
SWITCH
FRONT
M14
M13
DOOR
POSITION
SWITCH
REAR
BOTTOM HEATER
OVEN THERMAL
CUT-OUT (THERMAL OVEN)
A2
A4
A6
A1
M1
DOOR
SENSING
SWITCH
M3
F3
F2
F1
2a
2a
2a
2a
1a
2
P1 /
4
PROTECTOR
LEFT FRONT
SURFACE
ELEMENT
1a
2
P1 /
4
PROTECTOR
RIGHT REAR
SURFACE
ELEMENT
1a
PROTECTOR
1a
2
P1 /
4
PROTECTOR
RY-BRY-C
WARMER
SURFACE
ELEMENT
L2
L1
LOW VOLTAGE
TRANSFORMER
BLK
YLW
BLK
YLW
WHT
BLK
ORG
RED
YLW
RED
RED
BLK
WHT
WHT
RED
BRN
RED
YLW
RED
RED
YLW
ORG
YLW
YLW
WHT
YLW
RED
YLW
RED
RED
RED
BLK
BLK
BLK
RED
RED
RED
YLW
YLW
YLW
YLW
YLW
WHT
YLW
BLU
BLK
YLW
YLW
YLW
YLW
BRN
YLW
WHT
RED
BRN
BLU
BLK
YLW
WHT
WHT
BLK
BLK
BLU
BLU
BLU
BLK
BLU
BLK
BLK
YLW
RED
WHT
YLW
RED
BLK
YLW
YLW
YLW
WHT
BLK
RED
RED
BLK
RED
YLW
RED
BLK
ORG
ORG
BRN
BRN
BLK
WHT
WHT
YLW
WHT
WHT
ORG
RED
BLU
WHT
YLW
WHT
BRN
RED
BLK
GRY
BLK
WHT
WHT
BLU
BLK
REDRED
BLK
RED
WHT
WHT
BLK
BLK
BLK
BLK
BLK
BLU
BLK
BLK
BRN
GRY
YLW
ORG
YLW
BLK
RED
BLU
WHT
WHT
ORG
ORG
RED
BLK
RED
RED
RED
RED
BRN
RED
RED
WHT
GRN
BLK
RED
BLK
BRNBLK
BLK
RED
BLK
BLK
WHT
WHT
ORG
ORG
RED
WHT
BRN
BRN
ORG
WHT
WHT
ORG
RED
RED
BLK
WHT
1
3
3
1
BRN
WHT
WHT
WHT
BLK
RED
ORG
P1B /
4
P1A /
4A
KB-4425LS/K/W
Schematic-Off Condition
14
COOK TOP SCHEMATIC (DETAIL)
COOK TOP
L2
N
N
L1
L2
2
INSIDE
OUTSIDE
CONTROL
RIGHT FRONT
SURFACE
ELEMENT
4
4a
S2S1
P2
P1
H2 /
2
2a
1a
2
P1 /
4
CONTROL
H1 /
4
P
L1 /
P2
L2 /
P1
H2 /
2
PROTECTOR
CONTROL
INDICATOR LIGHT
INDICATOR LIGHT
HOT SURFACE LIGHT
HOT SURFACE
LIGHT
SWITCHES
H1 /
4
P
L1 /
P2
L2 /
P1
H2 /
2
CONTROL
LEFT REAR
SURFACE
ELEMENT
H1 /
4
P
L1 /
P2
L2 /
P1
1b /
H
RR
LR
RF
LF
2b /
S
1b /
H
2b /
S
1b /
H
2b /
S
1b /
H
2b /
S
2a
2a
2a
2a
1a
2
P1 /
4
PROTECTOR
LEFT FRONT
SURFACE
ELEMENT
1a
2
P1 /
4
PROTECTOR
RIGHT REAR
SURFACE
ELEMENT
1a
PROTECTOR
1a
2
P1 /
4
PROTECTOR
WARMER
SURFACE
ELEMENT
L2
BLK
YLW
BLK
YLW
WHT
BLK
ORG
RED
YLW
RED
RED
BLK
WHT
WHT
RED
BRN
RED
YLW
RED
RED
YLW
ORG
YLW
YLW
WHT
YLW
RED
YLW
RED
RED
RED
BLK
BLK
BLK
RED
RED
RED
YLW
YLW
YLW
YLW
YLW
WHT
YLW
BLU
BLK
YLW
YLW
YLW
YLW
BRN
YLW
WHT
RED
BRN
BLU
BLK
YLW
WHT
WHT
BLK
BLK
BLU
BLU
BLU
BLK
BLU
BLK
BLK
YLW
RED
WHT
YLW
RED
BLK
YLW
YLW
YLW
WHT
BRN
WHT
WHT
P1B /
4
P1A /
4A
KB-3425LS/K/W
KB-4425LS/K/W
15
KB-3425LS/K/W
SM
OL
FM
B1
B3
RY1
R
Y2
RY5
HUMIDITY
SENSOR
NOISE SUPRESSIONCOIL
RESISTOR 470kohm 1/2W
LINE CROSSCAPACITOR 1.0uF 250V
LINE BYPASSCAPACITOR
0.0033uF 250V
LINE BYPASSCAPACITOR
0.0033uF 250V
FUSE
20A
FAN MOTOR
OV
EN LAMP
MONITOR SWITCH
PRIMARY INTERLOCK
RELAY
RECTIFIERMAGNETRON
POWER TRANSFORMER
CAPACITOR
1.00uF
AC 2300V
STIRRER MOTOR
L
L
N.O.
COM.
N.O.
COM.
C1
E2
E1
RY11
CONTROL UNIT
M6
N1
N2
N3
N4
N5
M7
MICROWAVE DRAWER
SWITCHING POWER SUPPLY UNIT
N
OVEN
THERMAL
CUT-OUT
MG
THERMAL
CUT-OUT
SECONDARY INTELOCK SWITCH
VOLTAGE SWITCH
DM
MICROWAVE DRAWER
DOOR OPEN-CLOSE
MOTOR
DOOR
POSITION
SWITCH
FRONT
M14
M13
DOOR
POSITION
SWITCH
REAR
B
A2
A4
A6
A1
M1
DOOR
SENSING
SWITCH
M3
F3
F2
F1
RY-BRY-C
L2
L1
LOW VOLTAGE
TRANSFORMER
RED
RED
BLK
BLU
BLK
BLK
BRN
GRY
YLW
ORG
YLW
BLK
RED
BLU
WHT
WHT
ORG
ORG
RED
BLK
RED
RED
RED
RED
BRN
RED
RED
WHT
GRN
BLK
RED
BLK
BRNBLK
BLK
RED
BLK
BLK
WHT
WHT
ORG
ORG
RED
WHT
BRN
BRN
ORG
WHT
WHT
ORG
RED
RED
BLK
WHT
1
3
3
1
WHT
WHT
ORG
KB-4425LS/K/W
MICROWAVE DRAWER SCHEMATIC (DETAIL)
16
KB-3425LS/K/W
FM
CLOSS FLOW
FAN MOTOR
OL
OVEN LAMP
CONV. HEATER
TOP HEATER
LM
DOOR LOCK
MOTOR
N.O.
N.O.
COM.
COM.
RY7
RY4
RY10
RY3
RY8
M12
DOOR LOCK
MOTOR
SWITCH
THERMISTOR
M11
M10
M9
M8
M4
DOOR
SWITCH
M5
CONTROL UNIT
OVEN
L1
N
CM
RY9
CONV. MOTOR
D1
D5
D3
C3C7
C5
E6E5
E3
RY6
BOTTOM HEATER
OVEN THERMAL
CUT-OUT (THERMAL OVEN)
RY-BRY-C
BLK
RED
RED
BLK
RED
YLW
RED
BLK
ORG
ORG
BRN
BRN
BLK
WHT
WHT
YLW
WHT
WHT
ORG
RED
BLU
WHT
YLW
WHT
BRN
RED
BLK
GRY
BLK
WHT
WHT
BLU
BLK
REDRED
BLK
RED
WHT
WHT
BLK
BLK
BLK
BLK
WHT
BLK
RED
ORG
KB-4425LS/K/W
RANGE SCHEMATIC (DETAIL)
17
KB-3425LS/K/W
KB-4425LS/K/W
PROCEDURE
LETTER
A TOUCH CONTROL PANEL ASSEMBLY TEST
The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore,
TEST PROCEDURES
unlike conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter
and ohmmeter.
In this service manual, the touch control panel assembly is divided into three units, Control Unit and
Keyboard Unit and Power Unit, and troubleshooting by unit replacement is described according to the
symptoms indicated.
Before testing,
1) Disconnect the power supply cord, and then disassemble as per "OVEN/MICROWAVE DRAWER
DISASSEMBLY" page 40.
2) Open the drawer and block it open.
3) Discharge high voltage capacitor.
4) Disconnect the leads to the primary of the power transformer.
5) Ensure that these leads remain isolated from other components and oven chassis by using
insulation tape.
1. Keyboard Unit.
NOTE ;
1) Check Keyboard unit connection before replacement.
2) Reconnect all leads removed from components during testing.
3) Re-install the outer case (cabinet).
4) Reconnect the power supply cord after the outer case is installed.
5) Run the oven and check all functions.
The following symptoms indicate a defective keyboard unit.
a) When touching the pads, a certain pad produces no signal at all.
b) When touching a number pad, two figures or more are displayed.
c) When touching the pads, sometimes a pad produces no signal.
If the Keyboard unit is defective.
1) Disconnect the power supply cord, and then remove outer case.
2) Open the door and block it open.
3) Discharge high voltage capacitor.
4) Replace the Keyboard unit.
5) Reconnect all leads removed from components during testing.
6) Re-install the covers.
7) Reconnect the power supply cord after the outer case is installed.
8) Run the oven and check all functions.
2. Control Unit
The following symptoms indicate a defective control unit. Before replacing the control unit, perform
the Keyboard unit test (Procedure J) to determine if control unit is faulty.
2-1 In connection with indicators
a) At a certain digit, all or some segments do not light up.
b) At a certain digit, brightness is low.
c) Only one indicator does not light.
d) The corresponding segments of all digits do not light up; or they continue to light up.
e) Wrong figure appears.
f) A certain group of indicators do not light up.
g) The figure of all digits flicker.
2-2 Other possible problems caused by defective control unit.
a) Buzzer does not sound or continues to sound.
b) Clock does not operate properly.
c) Cooking is not possible.
3. Power Unit or Touch Control Transformer
a) Fan motor, stirrer motor, oven lamp or electrical parts do not turn on or do not turn off.
b) Digital display on the control unit does not show anything.
When testing is completed,
1) Disconnect the power supply cord, and then disassemble as per "OVEN/MICROWAVE DRAWER
DISASSEMBLY" page 40.
2) Open the drawer and block it open.
3) Discharge high voltage capacitor.
COMPONENT TEST
18
KB-3425LS/K/W
KB-4425LS/K/W
TEST PROCEDURES
PROCEDURE
LETTER
4) Reconnect all leads removed from components during testing.
5) Re-install the covers.
6) Reconnect the power supply cord after the outer case is installed.
7) Run the oven and check all functions.
B KEYBOARD UNIT TEST
1. Disconnect the power supply cord, and then disassemble as per "OVEN/MICROWAVE DRAWER
DISASSEMBLY" page 40.
2. Open the drawer and block it open.
3. Discharge high voltage capacitor.
4. If the display fails to clear when the STOP/CLEAR pad is depressed, first verify the wire harness
and connectors are making good contact between the control unit and the keyboard, verify that the
door sensing switch operates properly; that is the contacts are closed when the door is closed and
open when the door is open.
5. Remove the old keyboard unit and install the new keyboed unit (as the normal keyboard unit).
6. Reconnect the wire harness to the keyboard unit.
7. If the control unit responds by clearing with a beep when the stop/clear pad is touched, the old
keyboard unit is faulty and must be replaced. If the control unit does not respond, it is faulty and
must be replaced. If a specific pad does not respond, the above method may be used (after clearing
the control unit) to determine if the control unit or keyboed unit is at fault.
8. Reconnect all leads removed from components during testing.
9. Re-install the covers.
10. Reconnect the power supply cord after the outer case is installed.
11. Run the oven and check all functions.
COMPONENT TEST
C RELAY TEST
1. Disconnect the power supply cord, and then disassemble as per "OVEN/MICROWAVE DRAWER
DISASSEMBLY" page 40.
2. Open the drawer and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the leads to the primary of the power transformer.
5. Ensure that these leads remain isolated from other components and oven chassis by using insulation
tape.
6. After that procedure, re-connect the power supply cord.
7. Remove the covers and check voltage between Pin Nos. 1 and 3 of the 2 pin connector (CN-B) on
the power unit with an A.C. voltmeter.
The meter should indicate 116 or 120 volts, if not check oven circuit.
RY1 and RY2 Relay Test
These relays are operated by D.C. voltage
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation.
DC. voltage indicated - Defective relay.
DC. voltage not indicated - Check diode which is connected to the relay coil. If diode is good,
control unit is defective.
RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS
RY1 Approx. 18V D.C. Oven lamp / Stirrer motor
RY2 Approx. 18V D.C. Power transformer
RY3 Approx. 18V D.C. Oven common relay
RY4 Approx. 18V D.C. Top heater
RY5 Approx. 24V D.C. Fan motor (Microwave)
RY6 Approx. 24V D.C. Fan motor (Oven)
RY7 Approx. 24V D.C. Oven lamp (Oven)
RY8 Approx. 24V D.C. Door lock motor (Oven)
RY9 Approx. 24V D.C. Convection motor
RY10 Approx. 24V D.C. Warmer (Cook top)
RY11 Approx. 24V D.C. Switching power supply
RY-B Approx. 24V D.C. Bottom heater
RY-C Approx. 24V D.C. Convection heater
19
KB-3425LS/K/W
KB-4425LS/K/W
PROCEDURE
LETTER
8. Reconnect all leads removed from components during testing.
9. Re-install the covers.
10. Reconnect the power supply cord after the cabinets are installed.
11. Run the drawer and check all function.
D DEFROST TEST
WARNING : The unit should be fully assembled before following procedure.
(1) Place one cup of water in the center of the turntable tray in the oven cavity.
(2) Close the door, touch the Stop/Clear (M) pad and touch the Defrost pad on the LCD. Then touch
the Steaks/Chops pad on the LCD. And touch the number pad 5 on the LCD. (Now, weight 0.5lb is
set.) And then touch the start pad on the LCD.
(3) The oven is in Defrost cooking condition.
(4) The oven will operate as follows
(5) If improper operation is indicated, the control unit is probably defective and should be checked.
TEST PROCEDURES
COMPONENT TEST
WEIGHT 1ST STAGE 2ND STAGE 3RD. STAGE
LEVEL TIME LEVEL TIME LEVEL TIME
0.5lb 60% 20sec. 40% 20sec. 30% 45sec.
E PROCEDURES TO BE TAKEN WHEN THE FUSE ON THE PRINTED WIRING BOARD (PWB) IS OPEN.
To protect the electronic circuits, this model is provided with a fuse added to the primary on the PWB.
1. Fuse check and repairs.
1) Disconnect the power supply cord, and then disassemble as per "OVEN/MICROWAVE DRAWER
DISASSEMBLY" page 40.
2) Open the drawer and block it open.
3) Discharge high voltage capacitor.
4) If the Fuse is blown, replace power unit.
5) Make a visual inspection of the varistor. Check for burned damage. If the varistor has been
burned, replace the power unit.
6) Examine the touch control transformer with a tester for the presence of layer short-circuit (check
the primary coil resistance which is approximately 60Ω ± 10%). If any abnormal condition is
detected, replace the touch control transformer.
7) Reconnect all leads removed from components during testing.
8) Re-install the covers.
9) Reconnect the power supply cord after the outer case is installed.
10) Run the oven and check all functions.
2. Follow the troubleshooting guide given below, if indicator does not light up after above check and
repairs are finished.
1) Disconnect the power supply cord, and then disassemble as per "OVEN/MICROWAVE DRAWER
DISASSEMBLY" page 40.
2) Open the door and block it open.
3) Discharge high voltage capacitor.
4) Disconnect the leads to the primary of the power transformer.
5) Ensure that these leads remain isolated from other components and oven chassis by using
insulation tape.
6) After that procedure, re-connect the power supply cord.
7) Follow the troubleshooting guide given below for repair.
20
TEST PROCEDURES
PROCEDURE
LETTER
STEPS OCCURRENCE CAUSE OR CORRECTION
1 The rated AC voltage is not present between Check supply voltage and oven power cord.
Pin Nos. 1and 3 of the 2-pin connecter (CN-B).
2 The rated AC voltage is present at primary Touch control transformer or secondary circuit defective.
side of touch control transformer. Check and replace touch control transformer or power
unit .
8) Reconnect all leads removed from components during testing.
9) Re-install the covers.
10) Reconnect the power supply cord after the cabinets are installed.
11) Run the oven and check all functions.
F AH SENSOR TEST
Checking the initial sensor cooking condition
WARNING : The oven should be fully assembled before following procedure.
(1) The oven should be plugged in at least two minutes before sensor cooking.
(2) Room temperature should not exceed 95
(3) The unit should not be installed in any area where heat and steam are generated. The unit should not be
installed, for example, next to a conventional surface unit. Refer to the “INSTALLATION INSTRUCTIONS”
of the operation manual.
(4) Exhaust vents are provided on the back of the unit for proper cooling and air flow in the cavity. To permit
adequate ventilation, be sure to install so as not to block these vents. There should be some space for
air circulation.
(5) Be sure the exterior of the cooking container and the interior of the oven are dry. Wipe off any moisture
with a dry cloth or paper towel.
(6) The Sensor works with food at normal storage temperature. For example, chicken pieces would be at
refrigerator temperature and canned soup at room temperature.
(7) Avoid using aerosol sprays or cleaning solvents near the oven while using Sensor settings. The sensor
will detect the vapor given of by the spray and turn off before food is properly cooked.
(8) If the sensor has not detected the vapor of the food, ERROR will appear and the oven will shut off.
COMPONENT TEST
o
F (35oC).
KB-3425LS/K/W
KB-4425LS/K/W
Water load cooking test
WARNING : The oven should be fully assembled before following procedure.
Make sure the oven has been plugged in at least two minutes before checking sensor cook operation. The
cabinet should be installed and screws tightened.
(1) Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup.
(2) Place the container on the center of tray in the oven cavity.
(3) Close the door.
(4) Touch the UPER MICROWAVE OVEN pad, pad, pad, START MINUTE PLUS pad and the
SENSOR LOAD pad on the LCD. And touch the number pad 4 once. Now, the oven is in the sensor
cooking condition, and "20BIT" and "MICRO" will appear in the display.
(5) The oven will operate for the first 16 seconds, without generating microwave energy.
NOTE: ERROR will appear if the door is opened or STOP/CLEAR pad is touched during first stage of sensor
cooking.
(6) After approximately 16 seconds, microwave energy is produced.
If ERROR is displayed or the oven does not turn off, replace the AH sensor or check the control unit, refer
to explanation below.
<
<
TESTING METHOD FOR AH SENSOR AND/OR CONTROL UNIT
To determine if the sensor is defective, the simplest method is to replace it with a new replacement
sensor.
1) Disconnect the power supply cord, and then disassemble as per "OVEN/MICROWAVE
DRAWER DISASSEMBLY" page 40.
2) Open the drawer and block it open.
3) Discharge high voltage capacitor.
4) Remove the AH sensor.
21
KB-3425LS/K/W
Plunger
NC
NO
COM
COM
NO
NC
R3R4
R1
R2
1
2
3
F-1
F-2
F-3
To connector (F)
on Control Unit.
CONNECTOR
KB-4425LS/K/W
PROCEDURE
LETTER
TEST PROCEDURES
COMPONENT TEST
(5) Install the new AH sensor.
(6) Reconnect all leads removed from components during testing.
(7) Re-install the outer case (cabinet).
(8) Reconnect the power supply cord after the cabinets are installed.
(9) Reconnect the oven to the power supply and check the sensor cook operation as follows:
9-1. Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup.
9-2. Place the container on the center of tray in the oven cavity.
9-3. Close the door.
9-4. Touch the UPER MICROWAVE OVEN pad, pad, pad, START MINUTE PLUS pad and the
<
SENSOR LOAD pad on the LCD. And touch the number pad 4 once.
9-5. The control panel is in automatic Sensor operation.
9-6. The oven turns off automatically, and the time for detecting moisture will be displayed.
If new sensor dose not operate properly, the problem is with the control unit, and refer to explanation below.
CHECKING CONTROL UNIT
(1) Disconnect the power supply cord, and then disassemble as per "OVEN/MICROWAVE DRAWER
DISASSEMBLY" page 40.
(2) Open the drawer and block it open.
(3) Discharge high voltage capacitor.
(4) Disconnect the sensor connector that is mounted to control panel.
(5) Then connect the dummy resistor circuit (see fig.) to the sensor connector of control panel.
(6) Disconnect the leads to the primary of the power transformer.
(7) Ensure that these leads remain isolated from other components and oven chassis by using insulation
tape.
(8) After that procedure, re-connect the power supply cord.
(9) Check the sensor cook operation proceed as follows:
9-1. Close the door.
9-2. Touch the UPER MICROWAVE OVEN pad, pad, pad, START MINUTE PLUS pad and the
<
SENSOR LOAD pad on the LCD. And touch the number pad 4 once.
9-3. The control panel is in the sensor cooking operation.
9-4. After approximately 25 seconds, push plunger of select switch for more than 3 seconds. This condition
is same as judgement by AH sensor.
9-5. After approximately 3 seconds, the display shows “ X X . X X “ which is the time for detecting
moisture.
If the above is not the case, the control unit is probably defective.
If the above is proper, the AH sensor is probably defective.
(10) Disconnect the power supply cord, and the covers.
(11) Open the door and block it open.
(12) Discharge high voltage capacitor.
(13) Disconnect the dummy resistor circuit from the sensor connector of control panel.
(14) Carry out necessary repair.
(15) Reconnect all leads removed from components during testing and repairing.
(16) Re-install the covers.
(17) Reconnect the power supply cord after the cabinets are installed. Run the oven and check all
functions.
(18) Carry out "Water load cooking test" again and ensure that the oven works properly.
Checking the system with a Voltmeter, if the element
does not heat up.
1.Remove the back of the control panel to
expose the switch terminals.
2.With a Voltmeter set for AC on a scale higher
than 240 Volts measure the voltage drop
between terminals P2 and P1. If the meter
reads zero the wiring between the main
terminal block on the range and the switch is
open. If the meter reads line to line voltage
(around 240 VAC) go to step 3.
3.With the switch turned to the high position
measure the voltage drop between terminals
4 and 2. If the meter reads zero the switch
is defective. If the meter reads line to line
voltage the switch is good. If the range has
standard elements go to step 4. If the range
has a glass smooth go to step 5.
4.Remove the element and measure the
voltage drop between terminals of the terminal
block. If the meter reads zero the terminal
block or the wiring between the switch and the
terminal block is open. If the meter reads line
to line voltage the element is defective.
NOTE: Always inspect the terminal block for
burnt spots that can cause poor connection.
5.Raise the top and locate the two terminals on
the element that the wires from 4 and 2 are
on. Measure the voltage drop between the two
terminals. If the meter reads zero the wires
ELEMENT
CONTROL SYSTEMS
Two types of surface elements control systems are
covered in this manual.
1.Standard infinite switch.
2.Dual infinite switch.
Standard infinite switch:
The surface elements and standard infinite switches provide an infinite choice of heat settings for cooking. Controls are safety type and must be pushed in before turning. All surface controls are marked on the control panel
for their respective heating element. Power is supplied
to the surface elements through the infinite switch contacts P2-4 and P1-2. During actual surface element
operation, if the control is set to the high position contacts P1-2 are lock closed providing continuous power
to the element. In all other setting contacts L2-H2 will
cycle to maintain the correct heat setting. Contacts L1P provide power to the surface element indicator light.
Troubleshooting:
There are four ways a surface control system with a
standard infinite switch can fail.
1.The element does not heat.
2.The switch does not cycle the element off and
on when set to a position other than high.
3.The element operates correctly, but the
indicator light does not glow.
4.Indicator light glows with all infinite switches
in the off position.
NOTE: If the indicator light glows very dimly
with all the switches in the off position. This
problem is caused by a capacitive feed over in
the wiring and can be corrected by connecting
a 100,000 Ohm 1/4 watt resistor in parallel with
the light.
Continuity tests can be performed on the infinite switch
contacts. All tests should be performed with power to
the range disconnected, and wiring removed from the
switch. Set an ohmmeter on R X 1K scale and check
the contacts in the following chart and switch terminal
diagram.
Contacts
Di a l P os it ion
OFFLO-MEDHI
P2 - POXX
P2 - 4OXX
P1 - 2OX - CX
SURFACE
OX
- open- closed
P1
4
PILOT
P2
2
PROCEDURE
LETTER
G
TEST PROCEDURES
COMPONENT TEST
KB-3425LS/K/W
KB-4425LS/K/W
23
KB-3425LS/K/W
betweenthe switch andthe element areopen.
Ifthe meter reads lineto line voltagethe
elementisdefective.
Element does not cycle:
Ifthe element doesnot cycle whenthe switch isset in a
position otherthan high the switch isdefective.
Indicator light does not glow:
Ifindicatorlight doesnot glowwhen the switchis turned
on, remove the back panel of the backguard, turn the
switchon, andmeasurethe voltagedropbetweenterminals P and L2. If the meter reads zero the switch is
defective. Ifthe meterreads lineto line voltage(around
240 VAC) the light or the wiring to the light is defective.
Indicator light glows full brilliance with all top
element switchesoff:
If indicator light glows full brilliance with all top element
switchesoff, one or moreof the switchesare defective.
Disconnectelectricalpowerfromthe range,and remove
the back panel of the backguard. Disconnect the wire
from theP terminal on all switches butone switch. Reconnectpower. Iftheindicatorlightglowswiththeswitch
inthe off position,theswitchisdefective. If theindicator
light does not glow, the switch is good. Check each
switch by disconnecting the wires from all the other P
terminals but the switch youare testing.
Dual infinite switch:
The dual infinite switch is used to control the expandableandbridgeelementsonelectricsmoothtopranges.
The dual infinite switches provide an infinite choice of
heat settings for cooking, and two selection of element
sizes. Controls are safety type and must be pushed in
before turning. All surface controls are marked on the
controlpanelfor theirrespectiveheating element.
When the knob is turned clockwise, less than 180 degrees, contacts P2 to 4, P2 to 4A, and P1 to 2 closes
providing power to both elements. When the knob is
turned counterclockwise, less than 180 degrees, contacts P2 to 4 and P1 to 2 close providing power to the
inner element. During actual surface element operation,if the controlis set tothe high positioncontacts P1
to 2 are locked closed providing continuous power to
the element. In allother settings contacts P1 to 2 will
cycleto maintain thecorrect heat setting. Contact4 to
L2providespowerto thesurfaceelementindicatorlight.
Troubleshooting:
Thereare sixwaysa surfacecontrol systemwitha dual
infinite switch can fail.
1.Both elements do not heat.
2.Theouter element doesnot heat.
3.Theinner elementdoes notheat.
4.The switch does not cycle the element off and
on when set to a position other than high.
5.Theelement operates correctly, butthe
indicator lightdoes not glow.
6.Indicatorlightglowswithallthe infiniteswitches
in the off position.
NOTE: Ifthe indicatorlight glows very dimly
with all the switches in the off position. This
problemis causedby a capacitivefeed overin
the wiring and can be corrected byconnecting
a100,000Ohm 1/4watt resistorinparallelwith
the light.
SMALL
ELEMENT
LARGE
ELEMENT
See Cook Surface Schematic, Fig. 1
S2
S1
KB-4425LS/K/W
PROCEDURE
LETTER
TEST PROCEDURES
COMPONENT TEST
24
Both elements do not heat:
Checking the system with a Voltmeter, if the elements
do not heat up:
1.Removethe backpanel ofthe backguardto
expose the switch terminals.
2.With a Voltmeterset for AC and a scale higher
than240 Voltsmeasurethe voltagedrop
between terminals P1 and P2. If the meter
readszero the wiring between themain
terminal block on the range and the switch is
open.If the meterreads line toline voltage
(around 240 VAC) go to step3.
3.With the switch turnedclockwise to the HI
position,measurethevoltagedropbetween
terminals 4 and 2. If the meter reads zero the
switch isdefective. If the meter reads line to
linevoltagemeasurethe voltagedrop between
terminals 4A and 2. If the meter reads line to
line voltage the switch isgood. Goto step4.
4.Raise the top and locate the two terminals on
the elementwith the wires from terminals 4
and2areconnected. Measurethe voltagedrop
betweenthesetwoterminals. Ifthemeterreads
zero thewires between the switch and the
element areopen. If the meterreads line to
linevoltagethe elementis defective.
Outerelementdoesn’theat,butinnerelementdoes:
Checking the system with a Voltmeter, if the outer element does not heat,but the inner element does:
1.Removethe backpanel ofthe backguardto
expose the switch terminals.
2.With the switch turned clockwise to the high
positionmeasurethe voltagedropbetween
terminals 4A and 2. If the meter reads zero
the switch is defective. If the meter reads line
to line voltage, go to step 3.
3.Raise the top and locate the two terminals on
theelement where thewires from terminals4A
and2areconnected. Measurethe voltagedrop
betweenthesetwoterminals. Ifthemeterreads
zero thewires between the switch and the
element areopen. If the meterreads line to
linevoltagethe elementis defective.
Innerelementdoesn’theat,but outerelementdoes:
Checking the system with a Voltmeter, if the inner element does not heat, but the outer element does:
1.Removethe backpanel ofthe backguardto
expose the switch terminals.
2.With the switch turned clockwise to the high
positionmeasurethe voltagedropbetween
terminals 4 and 2. If the meter reads zero
the switch is defective. If the meter reads line
to line voltage, go to step 3.
3.Raise the top and locate the two terminals on
theelement where thewires from terminals4
and2are connected.Measurethevoltagedrop
betweenthesetwoterminals. Ifthemeterreads
zero thewires between the switch and the
element areopen. If the meterreads line to
linevoltagethe elementis defective.
Elements do notcycle:
If the elements do not cyclewhen theswitch is setin a
position otherthan high the switch isdefective.
Indicator light does not glow:
Ifindicatorlight doesnot glowwhen the switchis turned
on, remove the back panel of the backguard, turn the
switchon, andmeasurethevoltagedropbetweenterminals 4 and L2. If the meter reads zero the switch is
defective. Ifthe meterreads lineto line voltage(around
240VAC) the light or thewiring to the light is defective.
Indicator light glows full brilliance with all top elementswitchesoff:
If indicator light glows full brilliance with all top element
switchesoff,one ormoreofswitchesaredefective. Disconnectelectricalpowerfromtherange,andremovethe
back panel ofthe backguard. Disconnect the wire from
terminal 4 on theswitches from all but one switch. Reconnectpower. Iftheindicatorlightglowswiththeswitch
inthe offposition theswitch is defective. If theindicator
lightdoesnot glowthe switchisgood. Checkeach dual
infinite switch by disconnecting the wires from all the
other 4 terminals but the switch youare testing.
See Cook Surface Schematic, Fig. 1
S2
S1
PROCEDURE
LETTER
TEST PROCEDURES
COMPONENT TEST
KB-3425LS/K/W
KB-4425LS/K/W
25
KB-3425LS/K/W
KB-4425LS/K/W
PROCEDURE
LETTER
Refer to the disassembly instructions found on Page 16.
H MAGNETRON ASSEMBLY TEST
1. Disconnect the power supply cord.
2. Open the drawer and keep it open.
3. To discharge high voltage capacitor, wait for 60 seconds.
4. To test for an open filament, isolate the magnetron from the high voltage circuit. A continuity check across
the magnetron filament leads should indicate less than 1 ohm.
5. To test for a shorted magnetron, connect the ohmmeter leads between the magnetron filament leads
and chassis ground. This test should indicate an infinite resistance. If there is little or no resistance the
magnetron is grounded and must be replaced.
6. Reconnect all leads removed from components during testing.
7. Reassemble the unit.
8. Reconnect the power supply cord.
9. Run the oven and check all functions.
MICROWAVE OUTPUT POWER
The following test procedure should be carried out with the microwave oven in a fully assembled condition.
HIGH VOLTAGES ARE PRESENT DURING THE COOK CYCLE, SO EXTREME CAUTION SHOULD BE
OBSERVED.
Power output of the magnetron can be measured by performing a water temperature rise test. This test
should only be used if above tests do not indicate a faulty magnetron and there is no defect in the following
components or wiring: inverter unit. This test will require a 16 ounce (453cc) measuring cup and an accurate
mercury thermometer or thermocouple type temperature tester. For accurate results, the following procedure
must be followed carefully:
1. Fill the measuring cup with 16 oz. (453cc) of tap water and measure the temperature of the water with
a thermometer or thermocouple temperature tester. Stir the thermometer or thermocouple through the
water until the temperature stabilizes. Record the temperature of the water.
2. Place the cup of water in the oven. Operate oven at POWER 10(HIGH) selecting more than 60 seconds
cook time. Allow the water to heat for 60 seconds, measuring with a stop watch, second hand of a watch
or the digital read-out countdown.
3. Remove the cup from the oven and again measure the temperature, making sure to stir the thermometer
or thermocouple through the water until the maximum temperature is recorded.
4. Subtract the cold water temperature from the hot water temperature. The normal result should be 28ο to
54οF (16ο to 30οC) rise in temperature. If the water temperatures are accurately measured and tested
for the required time period the test results will indicate if the magnetron tube has low power output (low
rise in water temperature) which would extend cooking time or high power output (high rise in water
temperature) which would reduce cooking time. Because cooking time can be adjusted to compensate
for power output, the magnetron tube assembly should be replaced only if the water temperature rise
test indicates a power output well beyond the normal limits. The test is only accurate if the power supply
line voltage is 120 volts and the oven cavity is clean.
TEST PROCEDURES
COMPONENT TEST
I OVEN THERMAL CUT-OUT TEST
1. Disconnect the power supply cord.
2. Open the drawer and keep it open.
3. To discharge high voltage capacitor, wait for 60 seconds.
4. A continuity check across the thermal cut-out terminals should indicate a closed circuit unless the
temperature of the thermal cut-out reaches approximately 293οF(145οC).
An open thermal cut-out indicates overheating of the oven, exchange the oven thermal cut-out and
check inside of oven cavity and for improper setting of cooking time or operation of control unit.
Check for restricted air flow through the vent holes of the oven cavity, especially the cooling fan and
air guide.
5. Reconnect all leads removed from components during testing.
6. Reassemble the unit.
7. Reconnect the power supply cord.
8. Run the unit and check all functions.
CAUTION: IF THE THERMAL CUT-OUT INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE,
REPLACE THERMAL CUT-OUT.
26
TEST PROCEDURES
MONITOR
SWITCH
INTERLOCK
SWITCH
SECONDARY
(BLK)
(BRN,GRY)
(BRN,BLK)
(RED)
Screw Driver
Ohmmeter
PROCEDURE
LETTER
J SECONDARY INTERLOCK SWITCH TEST
COMPONENT TEST
KB-3425LS/K/W
KB-4425LS/K/W
1. Disconnect the power supply cord.
2. Open the drawer and keep it open.
3. To discharge high voltage capacitor, wait for 60 seconds.
4. Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO)
terminal of the switch. The meter should indicate an open circuit with the drawer open and a closed
circuit with the drawer closed. If improper operation is indicated, replace the secondary interlock
switch.
5. Reconnect all leads removed from components during testing.
6. Reassemble the unit.
7. Reconnect the power supply cord.
8. Run the oven and check all functions.
K STOP SWITCH TEST
STOP SWITCH
1. Disconnect the power supply cord.
2. Open the drawer and keep it open.
3. To discharge high voltage capacitor, wait for 60 seconds.
4. Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO)
terminal of the switch. The meter should indicate an open circuit with the drawer open and a closed
circuit with the drawer closed. If improper operation is indicated, replace the stop switch.
5. Reconnect all leads removed from components during testing.
6. Reassemble the unit.
7. Reconnect the power supply cord.
8. Run the oven and check all functions.
NOTE: If the stop switch contacts fail in the open position and the door is closed, the cooling fan motor,
stirrer motor and oven light will be activated by RY1.
L MONITOR SWITCH TEST
1. Disconnect the power supply cord.
2. Open the drawer and keep it open.
3. To discharge high voltage capacitor, wait for 60 seconds.
4. Before performing this test, make sure that the secondary interlock switch, according to the above
Switch Test Procedure. Disconnect the wire lead from the monitor switch (COM) terminal. Check
the monitor switch operation by using the ohmmeter as follows. When the drawer is open, the meter
should indicate a closed circuit. When the monitor switch actuator is pushed by a screw driver through
the lower latch hole on the front plate of the oven cavity with the drawer opened (in this condition the
plunger of the monitor switch is pushed in), the meter should indicate an open circuit. If improper
operation is indicated, the switch may be defective and both the monitor switch, plus fuse will need
to be replaced. After testing the monitor switch, reconnect the wire lead to the monitor switch (COM)
terminal and check the continuity of the monitor circuit.
5. Reconnect all leads removed from components during testing.
6. Reassemble the unit.
7. Reconnect the power supply cord.
8. Run the oven and check all functions.
27
KB-3425LS/K/W
KB-4425LS/K/W
TEST PROCEDURES
PROCEDURE
LETTER
M BLOWN MONITOR FUSE TEST
1. Disconnect the power supply cord.
2. Open the drawer and block it open.
3. To discharge high voltage capacitor, wait for 60 seconds.
4. If the monitor fuse is blown when the drawer is opened, check the primary interlock switch, secondary
interlock switch and monitor switch according to the "TEST PROCEDURE" for those switches before
replacing the blown monitor fuse.
CAUTION: BEFORE REPLACING A BLOWN MONITOR FUSE, TEST THE SECONDARY INTERLOCK
SWITCH, STOP SWITCH AND MONITOR SWITCH FOR PROPER OPERATION.
If the monitor fuse is blown by improper switch operation, the monitor fuse and monitor switch must
be replaced with "monitor fuse and monitor switch assembly" part number FFS-BA018/KIT, even if
the monitor switch operates normally. The monitor fuse and monitor switch assembly is comprised
of a 20 ampere fuse and switch.
5. Reconnect all leads removed from components during testing.
6. Reassemble the unit.
7. Reconnect the power supply cord.
8. Run the oven and check all functions.
COMPONENT TEST
N POWER TRANSFORMER TEST
1. Disconnect the power supply cord.
2. Open the drawer and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the primary input terminals and measure the resistance of the transformer with an
ohmmeter. Check for continuity of the coils with an ohmmeter. On the R x 1 scale, the resistance
of the primary coil should be less than 1 ohm and the resistance of the high voltage coil should be
approximately 90 ohms; the resistance of the filament coil should be less than 1 ohm.
5. Reconnect all leads removed from components during testing.
6. Reassemble the unit.
7. Reconnect the power supply cord.
8. Run the oven and check all functions.
(HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO
MEASURE THE FILAMENT AND HIGH VOLTAGE.)
O FAILURE CODES
The following failure codes will be displayed on the Control Panel.
EE 6 (displayed when oven starts) - Oven Thermistor is open.
Check thermistor or control unit.
EE 7 (displayed when oven starts) - Oven Thermistor is shorted.
Check thermistor or control unit.
EE L (displayed after 1 minute of cooking or self cleaning) - Lower door lock error.
Check lock motor, lock switch (RY 8) or control unit.
SPECAIL FAILURE NOTE:
During the Microwave Drawer operation, if it goes dead, check each Thermal Cut-out first.
This is due to the whole control unit being powered by Line L1 (refer to Schematic on page 13).
28
TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
KB-3425LS/K/W
KB-4425LS/K/W
The touch control section consists of the following units.
(1) Keyboard unit
(2) Control Unit
(3) Power unit
The principal functions of these units and the signals communicated among them are explained below.
Keyboard unit
The keyboard unit is composed of a matrix, signals generated in the LSI are sent to the keyboard unit . When a key
pad is touched, a signal is completed through the keyboard
unit and passed back to the LSI to perform the function that
was requested.
Control Unit and Power Unit
Control unit consists of LSI, IC, reset circuit, indicator circuit,
power source circuit, relay circuit, buzzer circuit, synchronizing signal circuit, keyboard unit circuit, humidity sensor
circuit and back light circuit.
1) IC1 (LSI)
This is a microcomputer, responsible for controlling the
entire control unit.
2) IC2
This is the IC to judge the selected key.
3) IC3
This is the IC to judge the selected key.
4) IC4
This is the IC to judge the selected key.
5) IC5
This is the IC to amplify the signal from the humidity
sensor and the IC to amplify the signal to adust the
contrast of LCD.
6) IC6
This is memory IC.
7) IC7
This is the IC to drive the relays.
8) IC8
This is the IC to drive the relays.
9) Reset Circuit
This circuit generates a signal which resets the LSI (IC1)
to the initial state when power is supplied.
10) Indicator Circuit
A circuit to drive the Liquid Crystal Displays (LCD1).
11) Power Source CircuitThis circuit generates voltages necessary in the control
unit from the AC line voltage.
In addition, the synchronizing signal is available in order
to compose a basic standard time in the clock circuit.
Symbol Voltage Application
VC +5V LSI(IC1)
12) Relay Circuit
A circuit to drive the magnetron, fan motor, stirrer motor,
convection motor, door lock motor, bottom heater, top
heater, convection heater and light the oven lamp.
13) Buzzer CircuitThe buzzer is responsive to signals from the LSI to
emit audible sounds (key touch sound and completion
sound).
14) Synchronizing Signal CircuitThe power source synchronizing signal is available in
order to compose a basic standard time in the clock
circuit.
It accompanies a very small error because it works on
commercial frequency.
15) Door Sensing Switch (Microwave drawer)
A switch to “tell” the LSI if the drawer is open or
closed.
16) Door Switch (Oven)
A switch to “tell” the LSI if the oven door is open or
closed.
17) Door Lock Monitor Switch (Oven)
A switch to “tell” the LSI if the oven door is locked or
not.
18) Door Position Switch Front / Rear
The switch to “tell” the position of the Microwave drawer
door.
19) Back Light Circuit
A circuit to drive the back light (Light emitting diodes
LD1- LD5).
20) Cook Top Warmer Indicator Circuit
A circuit to drive the indicator (LD10) for Cook Top
Warmer.
21) Transparent electrode (Touch key) on the
LCD
When the 1 - 6 of the transparent electrodes are
touched, the signal are input into the P96, P-95, P94,
P92, P91 and P90 of the LSI (IC-1) to perform the
function that was requested.
22) Humidity Sensor Circuit
This circuit detects moisture of the cooking food to allow
its automatic cooking.
23) Te mpe rat u re Me a sur eme n t C irc u it : (OVE N
THERMISTOR)
The temperature in the oven cavity is sensed by the
thermistor. The variation of resistance according to
sensed temperature is detected by the temperature
measurement circuit and the result applied to LSI. The
LSI uses this information to control the relay and display
units.
29
KB-3425LS/K/W
KB-4425LS/K/W
DESCRIPTION OF LSI (IC-1)
The I/O signal of the LSIis detailed in the following table.
Pin No. Signal I/O Description
1 P96 IN Signal coming from Transparent electrode (touch key on the LCD).When the 1 key of the transparent electrode is touched, a corresponding signal out of
OUT1 of IC-2 will be input into P96 of IC-1.
2 P95 IN Signal coming from Transparent electrode (touch key on the LCD).When the 2 key of the transparent electrode is touched, a corresponding signal out of
OUT3 of IC-2 will be input into P95 of IC-1.
3 P94 IN
When the 3 key of the transparent electrode is touched, a corresponding signal out of
4 P93 OUT The signal to adjust the contrast of LCD is output to IC-5.
5 P92 IN Signal coming from Transparent electrode (touch key on the LCD).When the 4 key of the transparent electrode is touched, a corresponding signal out of
6 P91 IN Signal coming from Transparent electrode (touch key on the LCD).When the 5 key of the transparent electrode is touched, a corresponding signal out of
7 P90 IN Signal coming from Transparent electrode (touch key on the LCD).When the 6 key of the transparent electrode is touched, a corresponding signal out of
8 BYTE IN Connected to VCC1.
9 CNVSS IN
The power source vpltage to drive the LSI (IC-1) is input. Connected to GND.
10 P87 OUT Memory (EEPROM) clock out.
11 P86 IN/OUT Memory (EEPROM) data input/output.
12 RESET IN
Signal is input to reset the LSI to the initial state when power is applied. Temporarily set
13 XOUT OUT Internal clock oscillation frequency control output.Output to control oscillation input of Xin.
14 VSS IN
The power source vpltage to drive the LSI (IC-1) is input. Connected to GND.
15 XIN IN Internal clock oscillation frequency setting input.The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
16 VCC1 IN
The power source voltage to drive the LSI (IC-1) is input to VCC1 therminal.
17 NMI IN Connected to VCC1.
18 P84 IN Input signal which communicates the drawer door close information to LSI from
Door opened; “L” level signal(0V).
Door closed; “H” level signal(+5V).
19 P83 IN
Door opened; “L” level signal(0V).
Door closed; “H” level signal(+5V).
Signal coming from Transparent electrode (touch key on the LCD).
OUT4 of IC-2 will be input into P94 of IC-1.
OUT1 of IC-3 will be input into P92.
OUT3 of IC-3 will be input into P91.
OUT4 of IC-3 will be input into P90.
Power source voltage: 0V (GND).
Auto clear terminal.
to “L” level the moment power is applied, at this time the LSI is reset. Thereafter set at
“H” level.
Power source voltage: 0V (GND).
respect to Xout terminal.
Power source voltage: +5.0V.
the door sensing switch.
Input signal which communicates the drawer door open information to LSI from
the door position switch front.
30
KB-3425LS/K/W
16.7 msec.
H : +5V
L : GND
A
B
C
H: +5V
L: GND
0.1 sec
2.0 sec
1.0 sec
1.0 sec
KB-4425LS/K/W
Pin No. Signal I/O Description
20 INT0 IN Signal to synchronize LSI with commercial power source frequency.
This is the basic timing for all real time processing of LSI.
21 P81 OUT Signal to change the rotational direction is output to the Microwave drawer door
open-close motor.
22 TA4OUT OUT Signal to sound buzzer.
A: Key touch sound.
B: Completion sound.
C: When the oven stops so that the food can be
checked in Automatic cooking mode.
23 P77 OUT Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay(RY2). In 100%
power operation, the signals holds “H” level during
microwave cooking and “L” level while not cooking.
In other cooking modes (90%, 80%, 70%, 60%,
50%, 40%, 30%, 20%, 10%, 0%) the signal turns
to “H” level and “L” level in repetition according to
the power level.
VARI MODE ON TIME OFF TIME ON TIME OFF TIME
100% power 32 sec. 0 sec. 60sec. 0ec.
90% power 30 sec. 2 sec. 54sec. 6sec.
80% power 26 sec. 6 sec. 48sec. 12sec.
70% power 24 sec. 8 sec. 42sec. 18sec.
60% power 22 sec. 10 sec. 36sec. 24sec.
50% power 18 sec. 14 sec. 30sec. 30sec.
40% power 16 sec. 16 sec. 24sec. 36sec.
30% power 12 sec. 20 sec. 18sec. 42sec.
20% power 8 sec. 24 sec. 12sec. 48sec.
10% power 6 sec. 26 sec. 4sec. 56sec.
0% power 0 sec. 32 sec. 0sec. 60sec.
Microwave cooking mode
Other cooking mode
24 TA3OUT OUT Signal to change the rotational speed is output to the Microwave drawer door open-close
motor.
25 TA2IN IN Plus signal coming from the Microwave drawer door open-close motor is input into TA2IN
as revolution number.
26-30 P74-P70 OUT Used for initial balancing of the bridge circuit (absolute humidity sensor).
31-33 A67-A65 OUT Turminal not used.
34 P64 IN To input signal which communicates the oven door open/close information to
LSI.
Door open "H" level signal (+5V). Door close "L" level signal (GND).
35 TXD0 IN Signal coming from key unit.
36 RXD0 IN Signal coming from key unit.
37 P61 OUT Signal to reset LSI.Signal is output to reset IC-2, IC-3 and IC-4.
38 P60 IN Signal coming from key unit.
39 RDY IN Connected to VCC2 (+3.3V).
40 ALE OUT Turminal not used.
41 HOLD IN Connected to VCC2 (+3.3V).
42 HLDA OUT Turminal not used.
43 BCLK IN Connected to VCC2 (+3.3V).
44 RD OUT Read strobe signal is outout to the LCD.
45 WRH OUT Turminal not used.
46 WR OUT Write strobe signal is outout to the LCD.
31
KB-3425LS/K/W
ON
OFF
During
door lock
motor driving
L: GND
H: +5V
ON
OFF
L: GND
H: +5V
ON
OFF
L: GND
H: +5V
ON
OFF
L: GND
H: +5V
ON
OFF
L: GND
H: +5V
ON
OFF
L: GND
H: +5V
ON
OFF
L: GND
H: +5V
ON
OFF
L: GND
H: +5V
KB-4425LS/K/W
Pin No. Signal I/O Description
47 P47 OUT Reset signal is outout to the LCD.
48 CS2 OUT Chip select signal is outout to the LCD.
49 P45 OUT Turminal not used.
50 P44 OUT Turminal not used.
51 P43 OUT Signal to turn on the indicator for the Cook Top Warmer is output to the LED (LD10).
52 P42 OUT
Door lock motor driving signal.
To turn on and off shut-off relay(RY8).
“H”level during door lock motor driving
“L” level otherwise
53 P41 OUT Power source to drive the Microwave drawer door open-close motor is output.
54 P40 IN Turminal not used.
55 P37 OUT Convection heater relay driving signal.To turn on and off relay(RYC).
“H” level: During convection heater relay ON.
“L” level: During convection heater relay OFF.
56 P36 OUT
Bottom heater relay driving signal.
To turn on and off relay(RYB).
“H” level: During bottom heater relay ON.
“L” level: During bottom heater relay OFF.
57 P35 OUT Cook top warmer driving signal.To turn on and off relay(RY10).
“H” level: During cook top warmer ON.
“L” level: During cook top warmer OFF.
58 P34 OUT
Oven convection motor driving signal.
To turn on and off relay(RY9).
“H” level: During convection motor ON.
“L” level: During convection motor OFF.
59 - 61 A11 - A9 OUT Turminal not used.
62 VCC2 IN Power source voltage: +3.3V.The power source voltage to drive the LSI (IC-1) is input to VCC2 terminal.
63 A8 OUT Turminal not used.
64 VSS IN
Power source voltage: 0V (GND).
VS voltage of power source circuit input. Connected to GND
65 - 70 A7 - A2 OUT Turminal not used.
71 A1 OUT Register select signal is input to the LCD.
72 A0 OUT Turminal not used.
73 P17 OUT
Signal to sound buzzer.
A: Key touch sound (short beep).
B: Completion sound (melody or long beep).
74 P16 OUT Door lock motor (Oven) driving signal.To turn on and off relay(RY8).
“H” level: During door lock motor ON.
“L” level: During door lock motor OFF.
75 P15 OUT Oven lamp (Oven) driving signal.To turn on and off relay(RY7).
“H” level: During oven lamp ON.
“L” level: During oven lamp OFF.
76 P14 OUT Fan motor (Oven) driving signal.To turn on and off relay(RY6).
“H” level: During fan motor ON.
32
KB-3425LS/K/W
ON
OFF
L: GND
H: +5V
ON
OFF
L: GND
H: +5V
ON
OFF
L: GND
H: +5V
ON
OFF
L: GND
H: +5V
During cooking
L: GND
H: +5V
16.7 msec.
KB-4425LS/K/W
Pin No. Signal I/O Description
“L” level: During fan motor OFF.
77 P13 OUT Fan motor (Drawer) driving signal.To turn on and off relay(RY5).
“H” level: During fan motor ON.
“L” level: During fan motor OFF.
78 P12 OUT
Top heater driving signal.
To turn on and off relay(RY4).
“H” level: During top heater ON.
“L” level: During top heater OFF.
79 P11 OUT Oven common relay driving signal.To turn on and off relay(RY3).
“H” level: During oven common relay ON.
“L” level: During oven common relay OFF.
80 P10 OUT Oven lamp and stirrer motor (drawer) driving signal.To turn on and off relay(RY1).
“H” level: During oven lamp and stirrer motor ON.
“L” level: During oven lamp and stirrer motor OFF.
81 - 88 D7 - D0 OUT Data signal is output to LCD driver.
89 AN7 OUT Turminal not used.
90 AN6 IN AH sensor input.This input is an analog input terminal from the AH sensor circuit, and connected to the
A/D converter built into the LSI.
91 AN5 IN Used for initial balancing of the bridge circuit (absolute humidity sensor). This input is
an analog input terminal from the AH sensor circuit, and connected to the A/D converter
built into the LSI.
92 AN4 IN Terminal to change the specifications of the LSI.By using A/D converter contained in the LSI, DC voltage in accordance wityh the Model
in operation is applied to set up its cooking constant.
93 AN3 IN Input signal which inform the drawer door is in the middle position between the opened
position and the closed position, to LSI from the door position switch rear.
94 AN2 IN Input signal which communicates the oven door locked information to LSI.
Door unlocked; “H” level signal(+5V).
Door locked; “L” level signal(0V).
95 AN1 IN
Input signal which communicates the oven door unlocked information to LSI.
Door locked; “H” level signal(+5V).
Door unlocked; “L” level signal(0V).
96 AVSS IN
A/D converter power source voltage.
The power source voltage to drive the A/D converter in the LSI.
97 AN0 IN Temperature measurement input: OVEN THERMISTOR.By inputting DC voltage corresponding to the temperature detected by the thermistor,
this input is converted into temperature by the A/D converter built into the LSI.
98 VREF IN Reference voltage input terminal.A reference voltage applied to the A/D converter in the LSI. Connected to +5V.
99 AVCC IN A/D converter power source voltage.The power source voltage to drive the A/D converter in the LSI. Connected to Vcc1
(+5V).
100 P97 OUT Common relays driving signal. (Square Waveform : 60Hz)
To turn on and off the shut-off relays (RY1 and RY3). The square waveform voltage is
delivered to the relays (RY1 and RY3) driving circuit.
33
KB-3425LS/K/W
ventilation opening for sensing
Sensing part
(Open vessel)
Sensing part
(Closed vessel)
Thermistors
S
C
R3
R1
R2
+
Operational
amplifier
Output
voltage
S : Thermistor
open vessel
C : Thermistor
closed vessel
2
Absolute humidity (g/m )
O
utput voltage
Absolute humidity vs,
output voltage characteristic
R43 1.8K
VA : +15VVC : +5V
R
4
2
3.5
7
K
R
4
1
3.3
2
K
S
C
R51 47K
R45 620K
R46 300K
R47 150K
R48 75K
R49 37.4K
R44 360K
R50 10K
3
F2
8
4
1
2
IC5
+
-
R40
430
C42 0.1µF
D40D41
R52 47K
86
90
74
P73
P72
P71
P70
AN5
SW1
SW2
SW3
SW4
SW5
AN6
LSI
(IC1)
91
30
29
28
27
26
C. Thermistor in
closed vessel
S. Thermistor in
open vessel
F3
F1
KB-4425LS/K/W
HUMIDITY SENSOR CIRCUIT
(1) Structure of Humidity Sensor
The humidity sensor includes two thermistors as shown
in the illustration. One thermistor is housed in the closed
vessel filled with dry air while another in the open vessel.
Each sensor is provided with the protective cover made of
metal mesh to be protected from the external airflow.
(2) Operational Principle of Humidity Sensor
The figure below shows the basic structure of an
absolute humidity sensor. A bridge circuit is formed by
two thermistors and two resistors (R1 and R2).
The output of the bridge circuit is to be amplified by the
operational amplifier.
Each thermistor is supplied with a current to keep it heated
at about 150οC (302οF), the resultant heat is dissipated
in the air and if the two thermistors are placed in different
humidity conditions they show different degrees of heat
conductivity leading to a potential difference between
them causing an output voltage from the bridge circuit, the
intensity of which is increased as the absolute humidity
of the air increases. Since the output is varied every
minute, it is amplified by the operational amplifier.
the resistance values results in that there is the same
potential at both F-3 terminal of the absolute humidity
sensor and AN5 terminal of the LSI. The voltage of AN6
terminal will indicate about +2.5V. This initial balancing is
set up about 16 seconds after the unit is put in the Sensor
Cooking mode. As the sensor cooking proceeds, the food
is heated to generate moisture by which the resistance
balance of the bridge circuit is deviated to increase the
voltage available at AN5 terminal of the LSI.
Then the LSI observes that voltage at AN6 terminal and
compares it with its initial value, and when the comparison
rate reaches the preset value (fixed for each menu to
be cooked), the LSI causes the unit to stop sensor
cooking; thereafter, the unit goes in the next operation
automatically.
When the LSI starts to detect the initial voltage at AN6
terminal 16 seconds after the unit has been put in the
Sensor Cooking mode, if it is not possible to balance
the bridge circuit due to disconnection of the absolute
humidity sensor, ERROR will appear on the display and
the cooking is stopped.
(3) Detector Circuit of Humidity Sensor Circuit
of the absolute humidity circuit to allow the LSI to
control sensor cooking of the unit. When the unit is set
in the sensor cooking mode, 16 seconds clearing cycle
occurs than the detector circuit starts to function and
the LSI observes the initial voltage available at its AN5
terminal.
With this voltage given, the switches SW1 to SW5 in
This detector circuit is used to detect the output voltage
the LSI are turned on in such a way as to change the
resistance values in parallel with R45 ~ R49. Changing
34
I
C
-
7
I
C
-
8
OVEN TEMPERATURE/SELF CLEANING CONTROL CIRCUIT
KB-3425LS/K/W
KB-4425LS/K/W
35
KB-3425LS/K/W
KB-4425LS/K/W
OVEN DOOR LOCK MOTOR CONTROL CIRCUIT
36
OVEN DOOR LOCK MOTOR DETECTION CIRCUIT
KB-3425LS/K/W
KB-4425LS/K/W
37
KB-3425LS/K/W
approx. 1M ohm
KB-4425LS/K/W
TOUCH CONTROL PANEL SERVICING
1. Precautions for Handling Electronic Components
This unit uses CMOS LSI in the integral part of the circuits.
When handling these parts, the following precautions
should be strictly followed. CMOS LSI have extremely
high impedance at its input and output terminals. For
this reason, it is easily influenced by the surrounding
high voltage power source, static electricity charge in
clothes, etc. and sometimes it is not fully protected by
the built-in protection circuit.
In order to protect CMOS LSI.
1) When storing and transporting, thoroughly wrap them
in aluminium foil. Also wrap all PW boards containing
them in aluminium foil.
2) When soldering, ground the technician as shown in
the figure and use grounded soldering iron and work
table.
2. Servicing of Touch Control Panel
We describe the procedures to permit servicing of the
touch control panel of the microwave oven and the
precautions you must take when doing so. To perform the
servicing, power to the touch control panel is available
either from the power line of the oven itself or from an
external power source.
(1) Servicing the touch control panel with power supply
of the oven:
CAUTION:
THE HIGH VOLTAGE TRANSFORMER OF THE
MICROWAVE OVE N I S STILL LIVE DURING
SERVICING AND PRESENTS A HAZARD.
Therefore, before checking the performance of the touch
control panel,
1) Disconnect the power supply cord.
2) Open the drawer and block it open.
3) Discharge high voltage capacitor.
4) Disconnect the leads to the primary of the power
transformer.
5) Ensure that these leads remain isolated from other
components and oven chassis by using insulation
tape.
6) After that procedure, re-connect the power supply
cord.
After checking the performance of the touch control
panel,
1) Disconnect the power supply cord.
2) Open the drawer and block it open.
3) Re-connect the leads to the primary of the power
transformer.
4) Reassemble the unit.
5) Re-connect the power supply cord after the outer
case is installed.
6) Run the oven and check all functions.
A. On some models, the power supply cord between the
touch control panel and the oven itself is so short that
the two can’t be separated. For those models, check and
repair all the controls (sensor-related ones included) of
the touch control panel while keeping it connected to
the oven.
B. On some models, the power supply cord between the
touch control panel and the oven proper is long enough
that they may be separated from each other. For those
models, it is possible to check and repair the controls of
the touch control panel while keeping it apart from the
oven proper; in this case you must short both ends of
the door sensing switch (on PWB) of the touch control
panel with a jumper, which activates an operational state
that is equivalent to the oven drawer being closed. As for
the sensor-related controls of the touch control panel,
checking them is possible if dummy resistor(s) with
resistance equal to that of the controls are used.
(2) Servicing the touch control panel with power supply
from an external power source:
Disconnect the touch control panel completely from
the oven proper, and short both ends of the drawer
sensing switch (on PWB) of the touch control panel,
which activates an operational state that is equivalent
to the oven door being closed. Connect an external
power source to the power input terminal of the touch
control panel, then it is possible to check and repair the
controls of the touch control panel it is also possible to
check the sensor-related controls of the touch control
panel by using the dummy resistor(s).
3. Servicing Tools
Tools required to service the touch control panel
assembly.
1) Soldering iron: 30W
(It is recommended to use a soldering iron with a
grounding terminal.)
2) Oscilloscope: Single beam, frequency range: DC10MHz type or more advanced model.
3) Others: Hand tools
4. Other Precautions
1) Before turning on the power source of the control
unit, remove the aluminium foil applied for preventing
static electricity.
2) Connect the connectors of the key unit to the control
unit being sure that the lead wires are not twisted.
3) After aluminium foil is removed, be careful that
abnormal voltage due to static electricity etc. is not
applied to the input or output terminals.
4) Attach connectors, electrolytic capacitors, etc. to
PWB, making sure that all connections are tight.
5) Be sure to use specified components where high
precision is required.
38
KB-3425LS/K/W
KB-4425LS/K/W
PRECAUTIONS FOR USING LEAD-FREE SOLDER
1. Employing lead-free solder
The "Main PWB" of this model employs lead-free solder. This is indicated by the "LF" symbol printed on the PWB and
in the service manual. The suffix letter indicates the alloy type of the solder.
Example:
Indicates lead-free solder of tin, silver and copper.
2. Using lead-free wire solder
When repairing a PWB with the "LF" symbol, only lead-free solder should be used. (Using normal tin/lead alloy solder
may result in cold soldered joints and damage to printed patterns.)
As the melting point of lead-free solder is approximately 40oC higher than tin/lead alloy solder, it is recommend that
a dedicated bit is used, and that the iron temperature is adjusted accordingly.
3. Soldering
As the melting point of lead-free solder (Sn-Ag-Cu) is higher and has poorer wettability, (flow), to prevent damage
to the land of the PWB, extreme care should be taken not to leave the bit in contact with the PWB for an extended
period of time. Remove the bit as soon as a good flow is achieved. The high content of tin in lead free solder will cause
premature corrosion of the bit. To reduce wear on the bit, reduce the temperature or turn off the iron when it is not
required.
Leaving different types of solder on the bit will cause contamination of the different alloys, which will alter their
characteristics, making good soldering more difficult. It will be necessary to clean and replace bits more often when
39
KB-3425LS/K/W
Gasket
Key Fixing Angle
C
o
n
t
r
o
l
K
no
b
s
R
et
a
i
ner
s
Glass Key Deco
Indicator Lamps
Lens
GND Deco Screw
C
o
n
t
r
o
l
P
a
n
e
l
M
o
l
d
KB-4425LS/K/W
OVEN / MICROWAVE DRAWER DISASSEMBLY
WARNING: Follow all safety precautions beginning on Page 2 before proceeding!
1. Before removing Control Panel, take measures to protect
the Cook Top surface and keep Microwave Drawer
open to prevent scratches.
2. Remove all Control Knobs (Fig 1).
3. Unscrew all Retainers (Fig 1).
4. Unscrew Glass Key Deco screw (1) (Fig 1).
5. Carefully lift Glass Key Deco and unhook
Indicator Lamp from Lens (Fig 1).
6. Remove all screws from Control Panel Mold
7. Slide Control Panel Mold to left (to unlock) and lift
(Fig 2).
(Fig 2).
Fig. 1
Fig. 2
8. Remove Gasket from Key Fixing Angle
(Fig 3).
9. Lift Key Fixing Mold and carefully unhook all Molex’s,
ground wire and C/P wiring (Fig 3).
NOTE: When reassembling, it is very important
that all Cook Top wires are tucked under the
Microwave cavity lip and secured with the RED
WIRE STRAP. The 240v harness can create
noise that can interfere with C/P function (example: intermittent or no keyboard operation).
Fig. 3
40
B
ack
P
an
e
l
S
i
d
e
P
a
ne
l
s
S
e
l
e
c
t
S
w
i
t
c
h
10. Remove screws from Control Panel Frame (Fig 4).
Cook Top
Slide angle
Control Panel Frame
11.
(KB3425L) - Slide Cook Top forward to unlock from
shoulder screws, then remove or reposition (Fig. 5).
(KB4425L) - Before you can Slide the Cook Top
forward to unlock it from shoulder screws, you must
remove one screw from each right and left slide angle
(Fig. 5A). This is done by removing the (3) screws
holding the back panel to the side panels (Fig. 6), then
carefully swing the back of the side panel out, to gain
access to the screw holding each right and left slide
angle.
Fig. 5
KB-3425LS/K/W
KB-4425LS/K/W
Fig. 4
Fig. 5A
12. Remove electrical cover and screws holding the select switch from back plate. Then remove all
screws on back plate and carefullyremove
back/side panels (Fig. 6).
Fig. 6
41
KB-3425LS/K/W
Air Duct
Back Plate
KB-4425LS/K/W
14. Remove screws from Microwave top Air Duct and take off (Fig. 7).
15. Remove all screws from Microwave Back Plate (Fig. 7).
16. Lift Back Plate and remove carefully not to damage any wires (Fig. 7).
NOT E:
The Microwave Back Plate cannot be
completely removed due to wiring. If you
need to remove, you will have to unhook all
wiring routed through it.
Also, the cushion placement is very important and must be replaced if damaged during
removal (Fig. 8).
Fig. 8
Fig. 7
At this point, you will have access to all parts of the Microwave and Oven.
MICROWAVE DRAWER ASSEMBLY REMOVAL TO ACCESS OVEN COMPONENTS
OVEN COMPONENT REMOVAL
1. After dissaembly as previously stated, remove Microwave Drawer assembly by removing (2) screws (right & left) from
front of Microwave Baseplate (Fig. R-1).
2. Unhook wires from Range Oven to Microwave Drawer, remove Drawer assembly from Oven.
You now have access to Range Oven components.
screw
Fig. R-1
42
STOP SWITCH, SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL
2. Open the drawer and keep it open.
1. Disconnect the power supply cord.
3. To discharge the high voltage capacitor, wait for 60
seconds.
4. Remove the Cook Top.
5. Remove the Cook Top Stay (right or left).
6. Remove the screw holding the latch hook to the oven
flange.
7. Remove the latch hook from the oven flange.
8. Disconnect the wire leads of each switch.
9. Remove each switch from the latch hook by pushing the
one (1) stopper tab holding each switch.
10. Now, each switch is free.
Re-install
1. Re-install each switch in its place. The secondary interlock
switch is in the lower position and the monitor switch is
in the top position, located on the left side of the unit.
The door sensing switch by itself on the right side of the
unit.
2. Re-connect wire leads to each switch. Refer to pictorial
diagram.
3. Secure the latch hooks with mounting screws to oven
flange.
4. Make sure that the monitor switch is operating properly
and check continuity of the monitor circuit. Refer to
chapter "Test Procedure" and "Adjustment procedure".
KB-3425LS/K/W
KB-4425LS/K/W
Latch Hook Left
STOP SWITCH, SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH
1. Disconnect the power supply cord.
Open the drawer and keep it open.
2.
3. To discharge the high voltage capacitor, wait for 60
seconds.
4. Remove the Cook Top.
5. Remove the Cook Top Stay (right or left). If the door
sensing switch, secondary interlock switch and monitor
switch do not operate properly due to a misadjustment,
the following adjustment should be made.
6. Loosen the screw holding latch hook to the oven cavity
flange.
7. With drawer closed, adjust latch hook by moving it back
and forth, and up and down. In and out play of the door
allowed by the upper and lower position of the latch hook
should be less than 0.5mm. The vertical position of the
latch hook should be adjusted so that the secondary
interlock switch is activated with the drawer closed. The
horizontal position of the latch hook should be adjusted
so that the monitor switch and drawer sensing switch
are activated with the drawer closed.
8. Secure the screws with washers firmly.
9. Check all of the switches operation. If any switch has
not activated fully, you will need to adjust the slide rail
attached to the Microwave cavity.
10. This is done by following the steps to remove the
"DRAWER/SLIDE RAIL REMOVAL" on page 42. After
you have removed the slide rails, loosen the "2" screws
holding the slide rail to the Microwave cavity and tilt the
front end up and the rear end down, then tighten the
screws (Fig. S-1).
11.Check and assure that the cap nuts on the Drawer
Support Angles are centered when passing through the
cavity face plate.
After adjustment, check the following.
1. In and out play of door remains less than 0.5mm when
in the latched position. First check upper position of latch
hook, pushing and pulling upper portion of drawer toward
the oven face. Then check lower portion of the latch hook,
pushing and pulling lower portion of the door toward the
oven face. Both results (play in the door) should be less
than 0.5mm.
2. The secondary interlock switch switch interrupt the circuit
before the door can be opened.
3. Monitor switch contacts close when door is opened.
4. Door sensing switch contacts open when door is
opened.
5. Reassemble the unit and check for microwave leakage
around door with an approved microwave survey meter.
(Refer to Microwave Measurement Procedure.
Fig. S-1
Latch Hook Right
ADJUSTMENT
43
KB-3425LS/K/W
KB-4425LS/K/W
DRAWER ASSEMBLY AND CHOKE REMOVAL
1. Disconnect the power supply cord.
DRAWER/SLIDE RAIL REMOVAL
2. Open the drawer and keep it open.
3. To discharge the high voltage capacitor, wait for 60
seconds.
4. Remove the both right and left Cook Top Stays.
5. Remove (2) Drawer Support Covers from Choke Cover
as shown in (Fig. D-1).
6. Insert a putty knife (thickness of about 0.5mm) into the
gap between the choke cover and the door frame.
7. Carefully slide choke cover away from drawer as far as
possible.
8. Remove (6) screws from all (3) drawer Support Angles
as shown in (Fig. D-2).
9. Unhook Drawer Support Angles from drawer, then
remove.
10. Now, the door assembly is free and the Choke Cover
can now be removed.
DRAWER SUPPORT ANGLE REMOVAL
1. Remove Drawer Assembly and Choke Cover as stated
in "DRAWER ASSEMBLY AND CHOKE REMOVAL".
2. Remove (2) screws from right or left Latch Angle
Assembly, then remove Angle assembly (Fig. D-4).
3. Separate Slide Rails by moving inside lever of Slide
Rails. The Slide Rail will now separate by pulling straight
forward and out (Fig. D-3).
4. At this point, you can replace either Latch Angle Assy
or Latch Angles.
To reassemble, just reverse the above order.
Fig. D-1
NOTE:
To remove only the
Microwave Drawer, follow steps
1, 2, 5, 8, 9 & 10
as instructed under
"DRAWER ASSEMBLY AND
CHOKE REMOVAL".
Fig. D-2
After reassembly, do the following.
(A) Make sure that drawer sensing switch, secondary
interlock switch and monitor switch are operating
properly. (Refer to chapter "Test Procedures".)
(B) An approved microwave survey meter should be
used to assure compliance with proper microwave
radiation emission limitation standards.
After any servicing, make sure of the following :
1. Drawer latch heads smoothly catch latch hook through
latch holes and that latch head goes through center of
latch hole.
2. Deviation of door alignment from horizontal line of cavity
face plate is to be less than 1.0mm.
3. Drawer is positioned with its face pressed toward cavity
face plate.
4. Reassemble the unit and check for microwave leakage
around drawer with an approved microwave survey meter.
(Refer to Microwave Measurement Procedure.)
Note: The drawer on a microwave oven is designed to
act as an electronic seal preventing the leakage
of microwave energy from oven cavity during
cook cycle. This function does not require that
door be air-tight, moisture (condensation)-tight
or light-tight. Therefore, occasional appearance
of moisture, light or sensing of gentle warm air
movement around oven drawer is not abnormal
and do not of themselves indicate a leakage of
microwave energy from oven cavity.
Fig. D-3
Fig. D-4
44
SWITCH ANGLE REMOVAL/ADJUSTMENT
KB-3425LS/K/W
KB-4425LS/K/W
SWITCH ANGLE REMOVAL
(Locate either the right or left switch angle)
1. Follow the Microwave Drawer disassembly as previously stated.
2. Open the drawer and keep it open.
3. To discharge the high voltage capacitor, wait for 60 seconds.
4. To remove switch, remove screw (1) holding switch to switch angle (Fig. S-
1).
5. To replace switch angle, remove bottom cover and remove the 2 screws holding
the switch lever (Fig. S-2).
6. Proceed in reverse to reinstall.
7. Adjust switch.
Fig. S-2
Fig. S-1
ACTUATOR REMOVAL/ADJUSTMENT
1. Follow the Microwave Drawer disassembly as previously stated.
2. Open the drawer and keep it open.
3. To discharge the high voltage capacitor, wait for 60 seconds.
4. Locate either the right or left actuator and remove the 2 screws holding the actuator to the door support
angles.
5. Replace with the new actuator (Fig. A-3).
Actuator adjustment
6. It is very critical that proper adjustment is made to actuator.
7. Adjust each actuator to fully depress ("0" gap) switch lever switches on left and right side (Fig. A-4).
NOTE: If this adjustment is not adjusted correctly, it will effect the performance of the Auto Drawer.
Fig. A-3
Fig. A-4
45
KB-3425LS/K/W
KB-4425LS/K/W
AUTO DRAWER GEAR REMOVAL
1. Follow the Microwave Drawer disassembly as previously stated.
2. Open the drawer and keep it open.
3. To discharge the high voltage capacitor, wait for 60 seconds.
4. Unhook wiring Auto Drawer Gear.
5. Remove the (4) screws holding the auto drawer gear to the bottom cavity angle (Fig. G-1).
5. Pull drawer gear from cavity angle.
6. The drawer gear is now free.
7. Proceed in reverse to reinstall the Auto Drawer Gear taking care that the gear teeth are set into
the cavity angle correctly.
Fig. G-1
RACK GEAR REMOVAL
1. Follow the Microwave Drawer disassembly as previously stated.
2. Open the drawer and keep it open.
3. To discharge the high voltage capacitor, wait for 60 seconds.
4. Remove the Microwave Drawer by following steps 1, 2, 5, 8, 9 & 10 as instructed under
"DRAWER ASSEMBLY AND CHOKE REMOVAL".
5. Remove the (3) screws holding the Rack Gear to the bottom slide rail (Fig. G-2).
7. Proceed in reverse to reinstall the new Rack Gear.
Fig. G-2
46
OVEN DOOR REMOVAL
Recepticle Hinge
Recepticle Hinge
Hinge Cover
OVEN DOOR ASSEMBLY REMOVAL
1. Disconnect the power supply cord.
2. Open the door to the fully opened position (Fig. O-1).
3. Pull the lock located on both hinge supports up and engage in the hook
of the hinge levers. You may have to apply a little downward pressure
on the door to pull the locks fully over the hooks (Fig. O-2).
4. Grab the door by the sides, pull the bottom of the door up and toward
you to disengage the hinge supports. Keep pulling the bottom of the
door toward you while rotating the top of the door toward the range to
completely disengage the hinge levers (Fig. O-3).
5. Proceed in reverse to reinstall the door.
6. Make sure the hinge supports are fully engaged before unlocking the
hinge levers.
Fig. O-1
KB-3425LS/K/W
KB-4425LS/K/W
OVEN DOOR RECEPTACLE HINGE AND HINGECOVER
REPLACEMENT
1. Disconnect the power supply cord.
2. Refer to the disassembly instructions as previously stated.
3. Remove (2) screws from Hinge Cover (Fig. O-4)
4. Remove Hinge Receptacle.
5 Proceed in reverse to reinstall the Hinge Receptacle and Hinge
Cover.
Fig. O-4
Fig. O-2
Fig. O-3
47
KB-3425LS/K/W
KB-4425LS/K/W
OVEN BAKE ELEMENT REMOVAL
1. Disconnect the power supply cord.
2. Refer to the disassembly instructions as previously stated.
3. Disconnect the wires by removing (2) nuts from element (Fig. O-5)
4. Remove the (2) screws holding the element from inside the oven (Fig. O-6).
5. Pull the Element into the oven.
6. Proceed in reverse to reinstall the Bake Element.
Fig. O-5
Fig. O-6
OVEN BROIL ELEMENT REMOVAL
1. Disconnect the power supply cord.
2. Refer to the disassembly instructions as previously stated.
3. Disconnect the wires by removing (2) nuts from element (Fig. O-7)
4. Remove the (2) screws holding the element from inside the oven (Fig. O-8).
5. Pull the Element into the oven.
6. Proceed in reverse to reinstall the Broil Element.
Fig. O-7
Fig. O-8
THERMISTOR REMOVAL
1. Disconnect the power supply cord.
2. Refer to the disassembly instructions as previously stated.
3. Unhook rear Molex wiring from Thermistor (Fig. O-9)
4. Remove tape from Thermistor rear hole.
5. Remove the (2) screws holding the Thermistor from inside the oven (Fig. O-10).
6. Pull the Thermistor into the oven.
7. Proceed in reverse to reinstall the Thermistor.
Fig. O-9
Fig. O-10
48
BLOWER MOTOR REMOVAL
1. Disconnect the power supply cord.
2. Refer to the disassembly instructions as previously stated.
3. Unhook all wiring from Blower Motor (Fig. O-11)
4. Remove tape from Thermistor rear hole.
5. Remove the (2) screws holding the Blower Motor to the Rear Plate.
6. The Blower Motor is now free.
7. Proceed in reverse to reinstall the Blower Motor.
KB-3425LS/K/W
KB-4425LS/K/W
Fig. O-11
LOCK MOTOR REMOVAL
1. Disconnect the power supply cord.
2. Refer to the disassembly instructions as previously stated.
3. Unhook all wiring from Lock Motor (Fig. O-12).
4. Remove the (2) screws holding the Lock Motor to the Rear Plate.
5. Pull Lock Motor from Lock Motor Shaft.
6. The Lock Motor is now free.
7. Proceed in reverse to reinstall the Lock motor.
Fig. O-12
49
KB-3425LS/K/W
KB-4425LS/K/W
CONVECTION MOTOR/IMPELLER BLADE REMOVAL
1. Disconnect the power supply cord.
2. Refer to the disassembly instructions as previously stated.
3. Unhook all wiring from convection Motor (Fig. C-16).
4. Remove the (8) screws holding the convection cover on from inside the oven (Fig. C-13).
5. Remove the (2) screws holding the convection heater in place (if necessary) (Fig. C-14).
6. Unscrew the convection fan nut by turning it clockwise (Fig. C-14).
7. Once the convection blade is removed, unscrew the (4) screws holding the convection motor in place (Fig. C-15).
8. The Lock Motor is now free.
9. Remove the "E" retaining clip and (2) washers holding the impeller blade on to the convection motor shaft (Fig. C-
16).
(Fig. C-13)(Fig. C-14)
(Fig. C-15)
(Fig. C-16)
50
COOK TOP RADIANT HEATERS/HOT SURFACE INDICATOR REMOVAL
1. Disconnect the power supply cord.
2. Refer to the disassembly instructions as previously stated.
3. After Cook Top Assembly is free, turn upside down (glass side down) on a protective surface to prevent
scratching (Fig. O-13).
4. Remove the (10) screws from Bottom Plate and place to the side.
5. Remove Heater Protect Cover (Fig. O-14).
6. Remove necessary spring strap from Radiant Element.
7. Unhook Radiant Element or Hot Surface Indicator wiring.
8. The Radiant Elements are now free.
9. Proceed in reverse to reinstall the Radiant Elements and/or Hot Surface Indicator.
KB-3425LS/K/W
KB-4425LS/K/W
Fig. O-13
Fig. O-14
51
KB-3425LS/K/W
WHT
RED
BLK
INFINITE SWITCHES (RIGHT SIDE)
PILOT LIGHT RIGHT
INFINITE SWITCHES (LEFT SIDE)
PILOT LIGHT LEFT
RED
BLK
WHT
ORG
RED
WHT
BLK
RED
WHT
RED
BRN
RED
YLW
BLK
ORG
RED
BLK
BRN
POWER CORD
JST VLR-06V
P2
P1
P1
4a
4
2
L1L2
H1H2
L2
(LF)
(LF)
(LF)(LF)
(RF)
(RF)
(RF)
L2
123456789
10
11
BLK
WHT
RED
WHT
WHT
BLK
WHT
WHT w/BRN STRIPE or BRN
WHT
VLR-12V
(TO COOKTOP HARNESS)
L1L24 (RF)
4a(RF)
H1(RR)
H1(LF)
H1(LR)
2 (RF)
H2(RR)
H2(LF)
H2(LR)
H2
(RR)
H1
(RR)
L2
(RR)
L1
(RR)
RED
YLW
L1
(LR)
L2
(LR)
H2
(LR)
H1
(LR)
(RF)
(RF)
(RF)
S2
P
(RF)
(RR)
YLW
S1
(RF)
P
(LF)
P
(LR)
1
2
3
4
5
6
BLK
BLK
BLK
RED
RED
RED
RED
WHT
RED
L1L1L1L2L2
L2
GRN
GRN
YLW
YLW
YLW
YLW
YLW
P
P
WHT
or
w/YLW
STRIPE
WHT
or
w/BRN
STRIPE
WHT
or
w/BRN
STRIPE
WHT w/BRN STRIPE or BRN
WHT w/YLW STRIPE or YLW
12
KB-4425LS/K/W
CONTROL PANEL WIRING DIAGRAM
52
COOK TOP WIRING DIAGRAM
YLW
YLW
WHT
WARMER
(CR)
CENTER REAR
1 ZONE
WHT
P1
2a
(JST VLP-12V)
TO INFINITE SW HARNESS
(JST ELP-02V)
TO DRAWER HARNESS
1
2
BRNBLKYLWBLUWHT
SURFACE LAMPS
LEFT FRONT
SMALL
LEFT REAR
LARGE
1 ZONE
1 ZONE
(LR)
(LF)
WHT
2a
P1
BLK
YLW
YLW
YLWBLU
BRN
2a
P1
WHT
YLWBLK
YLW
BLU
BLK
RIGHT FRONT
LARGE
RIGHT REAR
SMALL
2 ZONE
1 ZONE
(RF)
(RR)
YLW
2a
1b
BRN
YLWYLW
WHT
BLK
BLU
2b
2b
BLU
BLK
RED
YLW
P1B
WHT
YLW
BLUBRN
L2RFLFLRRR
2a
1b
P1A
1
2
3
4
5
6
789
10
11
P1
1b
2b
1b
2b
BLK
WHT
RED
WHT
WHT
BLK
WHT
BRN
YLW
WHT
BRN
L1
L2
4 (RF)
4a(RF)
H1(RR)
H1(LF)
H1(LR)
H2(RF)
H2(RR)
H2(LF)
H2(LR)
12
KB-3425LS/K/W
KB-4425LS/K/W
53
KB-3425LS/K/W
WHT
HOUSING COLOR : BLUE
ORGRED
(JST ELR-02VF)
(FOR CONVECTION HEATER)
RY-C
(COM)(N.C.)(N.O.)
BLK
GRY
WHT
WHT
WHTBLUBRN
RED
(N.C.)(N.O.)(COM)
ORG
RED
TO SWITCHING REGULATOR
(JST VHR-3N)
BLK
WHT
3
GRN
RED
(L2)(N)
(L1)
WHT
WHT
BLU
GRY
RED
YLW
BRN
ORG
YLW
BLK
ORG
RED
RED
YLW
BLK
RED
RED
ORG
BLK
RED
RED
GRN
REDBLK
(N.O.)(COM.)
BRN
BLK
RED
BRN
RED
BRN
(COM.)
(N.C.)
(COM.)
RY-4
(N.O.)
BRN
RED
DOOR POSITION SWITCH
(N.O.)
(COM.)
GRY
BRN
WHT
WHT
ORG
WHTORG
BRN
GRY
GRN
WHT
BLK
BLU
ORG
YLW
WHT
RED
YLW
(COM.)
GRN
STOP SW
WHT
EX
(N.O.)
421 3 5
BLU
YLW
BLK
RED
(JST XMR-05V)
DC MOTOR
ORG
EXEX
EX
EX
EX
EX
EX
EX
ORG ORG
EXEX
REDBLK
HVT
(BACK) (CENTER) (FRONT)
TO PWB CND
TO PWB CNE
TO PWB CNC
(JST VHR-7N)
(JST VHR-5N)
(JST VHR-7N)
(JST VHR-4N)
EARTH
(JST VLP-12V)
(JST VLP-06V)
RY-2
RY-3
RY-1
(COM.)
(N.O.)
(COM.)
(COM.)
(N.O.)
(N.O.)
BLKORGREDRED
NOISE FILTER
FAN MOTOR
TO PWB CNB
EX
(JST XAP-05V-1)
(JST XMR-04V)
OVEN THERMAL
CUT-OUT
STIRRER
MOTOR
WHT
ORG
OVEN LAMP
TO CPU CNN
5
HARNESS
TO COOKTOP
TO CPU HARNESS
124
3
1
2
21 3 4
MONITOR SW
EX
EX EX
RED ORG
EX
SWITCH
SECONDARY INTERLOCK
(JST VHR-3N)
RED
1 2 3
EX
EX
7421 3 5 6
BLK
531 2 4
BLK
BLK
RED
6531 2 47
EX
TO "L"
TO "N"
TO "RED"
TO "WHT"
RED
BLK
RED
EX
EX
BLK
BLK
EX
EX
TO OVEN HARNESS
7 8 9 10 11 12
RED
BLK
BLK
BRN
21 3 54 6
TO OVEN HARNESS
BRN
BLK
64 5
RED WHT
WHT
BLK
31 24
RED
BLK
31 2
1 2
(FOR BOTTOM HEATER)
RY-B
MG THERMAL
CUT-OUT
KB-4425LS/K/W
MICROWAVE DRAWER WIRING DIAGRAM
54
KB-3425LS/K/W
(JST XAP-14V-1)
BLK
BLK
1413
DOOR POSITION SWITCH-REAR
(N.O.)(COM)
BLKBLK
EXEX
(JST XAP-06V-1)
TO PWB CNJ
TO PWB CNH
(JST XAP-15V-1)
TO OVEN HARNESS
(JST XMP-07V)
(JST XAP-06V-1)
TO CPU CNK
(JST XAP-15V-1)
(JST XMP-04V)
TO DRAWER HARNESS
BRN
GRY
BRN
GRY
TO CPU CNM
BLK
BLK
BLK
BLK
BLK
WHT
BLK
BLK
BLK
BLK
BLK
TO CPU CNL
65432
1
431 2
WHT
GRN
65432
1
RED
RED
ORG
ORG
BLK
RED
BRN
YLW
GRN
RED
BLK
YLW
BRN
WHT
ORG
ORG
WHT
GRY
GRY
GRY
GRY
GRY
GRY
GRY
GRY
GRY
GRY
GRY
GRY
GRY
GRY
GRY
GRY
GRY
GRY
GRY
GRY
GRY
GRY
GRY
GRY
GRY
GRY
GRY
GRY
WHT
Note: The parts marked “∆” may cause undue microwave exposure.
The parts marked “*” are used in voltage more than 250V. "§" MARK: PARTS DELIVERY SECTION
REF. NO. PART NO. § DESCRIPTION Q'TY CODE
1- 1 HPNLCB200MRF0 M Control panel mold 1 AS
1- 2 DPWBFB132MRU3 M Control unit 1 CB
1- 3 LHLD-B029MRF0 M PWB holder 1 AN
1- 4 XEPS730P08XS0 M Screw : 3mm x 8mm 8 AA
1- 5 LANGQB072MRP0 M Key xing angle 1 AN
1- 6 QSWTEB002MRE0 M Double control 1 AW
1- 7 QSWTEB006MRE0 M Innite switch 3 AT
1- 8 PLNS-B003MRE0 M Lens 2 AA
1- 9 FW-VZB259MRE0 M C/P harness 1 BA
1-10 XBTWW40P06000 M Screw : 8mm x 6mm 8 AA
1-11 XCTSD40P08000 M Screw : 8mm x 8mm 4 AA
1-12 RLMP-B005MRE0 M Indicator lamp 2 AF
1-13 XOTS740P12000 M Screw 6 AA
1-13 XCTSF50P12000 M Optional oversized screw 6 AA
1-14 PSEL-B001MRE0 M Gasket, dark gray 1 AN
1-15 FUNTKB436MRK0 M Glass key unit [KB3425LS][KB3425LK][KB4425LS][KB4425LK] 1 BP
1-15 FUNTKB443MRK0 M Glass key unit [KB3425LW][KB4425LW] 1 BP
1-16 HDECQB001MRR0 M Glass key deco [KB3425LS] [KB4425LS] 1 AK
1-16 HDECQB056MRR0 M Glass key deco [KB3425LK] [KB4425LK] 1 AK
1-16 HDECQB057MRR0 M Glass key deco [KB3425LW] [KB4425LW] 1 AK
1-17 LRTNPB003MRF0 M Retainer [KB3425LS][KB3425LK] [KB4425LS][KB4425LK] 4 AD
1-17 LRTNPB002MRF0 M Retainer [KB3425LW] [KB4425LW] 4 AD
1-18 FKNBKB010MRK0 M Control knob assy [KB3425LS] [KB4425LS] 4 AL
1-18 FKNBKB009MRK0 M Control knob assy [KB3425LK] [KB4425LK] 4 AG
1-18 FKNBKB006MRK0 M Control knob assy [KB3425LW] [KB4425LW] 4 AD
1-19 GWAKPB219MRF0 M C/P frame [KB3425LS][KB3425LK] 1 BA
1-19 GWAKPB220MRF0 M C/P frame [KB3425LW] 1 BB
1-19 GWAKPB221MRF0 M C/P frame [KB4425LS][KB4425LK] 1 BB
1-19 GWAKPB222MRF0 M C/P frame [KB4425LW] 1 BC
63
KB-3425LS/K/W
6
45
1
2
3
6
45
1
2
3
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
1-7
1-7
1-7
1-5
1-1
1-12
1-8
1-8
1-16
1-12
1-19
1-2
1-11
1-14
1-11
1-12
1-12
1-14
1-18
1-17
1-17
1-14
1-10
1-15
1-3
1-4
1-6
1-18
1-13
1-13
Actual wire harness may be different from illustration.
1-9
KB-4425LS/K/W
CONTROL PANEL
CONTROL PANEL HARNESS
64
KB-3425LS/K/W
KB-4425LS/K/W
COOK TOP PARTS LIST
Note: The parts marked “∆” may cause undue microwave exposure.
The parts marked “*” are used in voltage more than 250V. "§" MARK: PARTS DELIVERY SECTION
REF. NO. PART NO. § DESCRIPTION Q'TY CODE
2- 1 FW-VZB303MRE0 M Cook top harness 1 AY
2- 2 RLMP-B001MRE0 M Surface indicator 1 AU
2- 3 RHET-B001MRE0 M Radiant heater (2000 w) 1 BA
2- 4 RHET-B002MRE0 M Radiant heater (1200 w) 2 AZ
2- 5 RHET-B003MRE0 M Radiant heater (Dual) 1 BD
2- 6 FANG-B027MRY0 M Cook top glass assy [KB3425LS] [KB3425LK] 1 CA
2- 6 FANG-B028MRY0 M Cook top glass assy [KB3425LW] 1 CA
2- 6 FANG-B030MRY0 M Cook top glass assy [KB4425LS] [KB4425LK] 1 CC
2- 6 FANG-B031MRY0 M Cook top glass assy [KB4425LW] 1 CC
2- 7 PFPF-B009MRE0 M Heat protect 1 AH
2- 8 PCOVPB158MRP0 M Heat protect cover 1 AP
2- 9 MLEVPB018MRE0 M 6" spring strap 2 AH
2-10 MLEVPB020MRE0 M 8" spring strap 1 AH
2-11 MLEVPB021MRE0 M 9" spring strap 1 AH
2-12 XOTS740P12000 M Screw 25 AA
2-13 LX-CZB027MRE0 M Shoulder screw 4 AA
2-14 HDEC-B038MRY0 M Backsplash [KB3425LS] 1 BV
2-14 HDEC-B034MRT0 M Backsplash [KB3425LK] 1 BS
2-14 HDEC-B035MRT0 M Backsplash [KB3425LW] 1 BS
2-15 RHET-B012MRE0 M Radiant heater warm 1 BB
2-16 MLEVPB019MRE0 M 7" spring strap 1 AK
2-17 LANG-B040MRT0 M Backsplash support 1 AV
2-18 PCUSGB075MRP0 M Glass cushion 1 AK
2-19 LX-CZA084WRE0 M Screw 8 AA
2-20 HDECAB353MRT0 M Cook top deco L [KB3425LS] [KB3425LK] 1 AQ
2-20 HDECAB355MRT0 M Cook top deco L [KB3425LW] 1 AQ
2-21 HDECAB352MRT0 M Cook top deco R [KB3425LS] [KB3425LK] 1 AQ
2-21 HDECAB354MRT0 M Cook top deco R [KB3425LW] 1 AQ
65
KB-3425LS/K/W
6
45
1
2
3
6
45
1
2
3
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
Actual wire harness may be different from illustration.
2-1
2-2
2-4
2-5
2-11
2-9
2-4
2-9
2-3
2-10
2-15
2-16
2-7
2-8
2-13
2-12
2-12
2-13
2-6
2-12
2-12
KB4425L
KB3425L
2-19
2-20
2-19
2-21
2-18
Front view
2-12
2-17
2-14
2-12
2-6
Rear view
Rear view
COMMON PARTS
KB-4425LS/K/W
66
KB-3425LS/K/W
KB-4425LS/K/W
MICROWAVE DRAWER PARTS LIST
Note: The parts marked “∆” may cause undue microwave exposure.
The parts marked “*” are used in voltage more than 250V. "§" MARK: PARTS DELIVERY SECTION
REF. NO. PART NO. § DESCRIPTION Q'TY CODE
3- 1 RTRN-B083MRE0 M Transformer 1 BE
∆
3- 2 RV-MZA288WRE0 M Magnetron 1 BK
3- 3 FDTCTA234WRKZ M Sensor assy 1 AP
3- 4 FFS-BA018/KIT M Monitor switch (V-16G-2C25) with fuse (20A) assembly 1 AF
3- 5 RTRNPA006WRZZ M Touch control transformer 1 AP
3- 6 TCAUAB050MRR0 M Monitor caution label 2 AD
3- 7 LHLD-B028MRF0A M Power supply unit holder 1 AH
3- 8 DPWBFB133MRU0 M Power supply 2 BD
3- 9 LANGTB122MRP0 M Oven lamp angle 1 AF
3-10 LX-CZ0052WRE0 M Screw/washer 6 AA
3-11 GCABDB001MRP0 M Back plate 1 BB
3-12 PDUC-B141MRP0 M Mag duct 1 AE
3-13 PDUC-B142MRP0 M Sensor duct 1 AK
3-14 PDUC-B147MRP0 M Exhaust duct A 1 AK
3-15 PDUC-B148MRP0 M Exhaust duct B 1 AF
3-16 FCOVPB002MRY0 M Stir cover assy 1 AM
3-17 PCLICB003MRE0 M Canoe clip 3 AB
3-18 MSLIFB001/KIT M Slide rail 3 AU
3-19 LANGTB120MRT0 M Door support angle A 2 AK
3-20 LANGTB187MRP0 M Door support angle B 1 AN
3-21 GCOVHB051MRF0 M Door support cover 2 AB
3-22 PSKR-B018MRP0 M Magnetron air guide 1 AC
3-23 PFILWB005MRP0 M Lamp lter 1 AB
3-24 LANGTB076MRP0 M Partition angle 1 AK
3-25 FC-QZB048MRK0 M HVC assy 1 AP
*
3-26 LBNDKB007MRP0 M HVC band 1 AB
3-27 LX-BZA041WRE0 M Screw 20 AA
3-28 XOTS740P12000 M Screw 179 AA
3-29 LANGTB156MRP0 M Partition angle L 1 AK
3-30 LANGQA581WRPZ M Noise unit angle 1 AD
3-31 XJTS740P16000 M Screw 4 AA
3-32 XOTSD40P12RV0 M Power unit assy screw 4 AA
3-33 DDORFB099MRK0 M Door assy [KB3425LS] [KB4425LS] 1 BR
3-33 DDORFB100MRK0 M Door assy [KB3425LK] [KB4425LK] 1 BR
3-33 DDORFB104MRK0 M Door assy [KB3425LW] [KB4425LW] 1 BR
3-34 PSHEPB184MRE0 M Sealer lm 1 AQ
3-35 FFAN-B008MRK0 M Stirrer fan assy 1 AK
3-36 FANGTB010MRK0 M Latch angle assy R 1 AH
3-37 FANGTB011MRK0 M Latch angle assy L 1 AH
3-38 LANGTB088MRP0 M Cooktop stay L 1 AM
3-39 LANGTB094MRP0 M Cooktop stay R 1 AY
3-40 RRLYDA012DRZZ M Heater relay A 2 AH
3-41 LX-NZB006MRE0 M Cap nut 6 AA
3-42 XHTS740P08RV0 M Screw 4 AA
3-43 TCAUKB001MRR0 M Stirrer cover cleaning label 1 AA
3-44 FMOTEA494WRKZ M Fan motor 1 AZ
3-45 LANGTB155MRP0 M Fan motor angle 1 AG
3-46 RTHM-A135WRZZ M Magnetron thermal cut-out 1 AD
3-47 FW-VZB310MRK0 M Harness assy 1 BE
3-48 PHOK-A079WRF0 M Latch hook R 1 AH
3-49 QSW-MA085WRE0 M Switch 1 AE
3-50 PHOK-A080WRF0 M Latch hook L 1 AF
3-51 MLEVPA214WRF0 M Switch lever L 1 AK
3-52 QSW-MA---WRE0 M Monitor switch - must replace by assy. (3-4) 1 AE
3-53 QSW-MA085WRE0 M Switch 4 AE
3-54 QSOCLB010MRE0 M Lamp socket 1 AG
3-55 FW-VZB263MRE0 M CPU harness 1 AV
3-56 FPWBFA380WRKZ M Noise lter unit 1 AM
3-57 RLMPTA093WRZZ M Oven lamp 1 AF
67
KB-3425LS/K/W
KB-4425LS/K/W
REF. NO. PART NO. § DESCRIPTION Q'TY CODE
3-58 JHNDPB052MRM0 M Door handle [KB3425LS] [KB4425LS] 1 AS
3-58 JHNDPB054MRM0 M Door handle [KB3425LK] [KB4425LK] 1 AS
3-58 JHNDPB055MRM0 M Door handle [KB3425LW] [KB4425LW] 1 AS
3-59 FGLSPB002MRY0 M Oven tray assy 1 BK
3-60 GCOVHB053MRF0 M Choke cover 1 AM
3-61 LX-CZB027MRE0 M Shoulder screw 6 AA
3-62 RMOTDA262WRZZ M Stirrer motor 1 AH
3-63 TCAUHB009MRR0 M User caution label 1 AA
3-64 FANGTB017MRK0 M Auto drawer gear assy 1 BK
3-65 LANGTB105MRP0 M Switch angle 2 AE
3-66 MACT-B001MRF0 M Actuator R 1 AD
3-67 MACT-B002MRF0 M Actuator L 1 AD
3-68 DPWBFC526WRKZ M SW power supply 1 CM
3-69 NGERRB005MRF0 M Rack gear 2 AQ
3-70 PCUSUB088MRP0 M Cushion 1 AC
3-71 LHLD-B033MRF0 M Switch PSU holder 1 AE
3-72 XOTS740P08000 M Screw 1 AA
3-73 XEPS730P10XS0 M Screw 4 AA
3-74 PCUSUB084MRP0 M Cushion 1 AG
3-75 PCUSUB086MRP0 M Cushion 1 AA
68
6
45
1
2
3
6
45
1
2
3
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
MICROWAVE DRAWER
Actual wire harness may be different from illustration.
3-55
3-47
3-39
3-3
3-12
3-18
3-36
3-57
3-54
3-9
3-2
3-19
3-37
3-19
3-16
3-35
3-43
3-63
3-23
3-20
3-17
3-18
3-10
3-8
3-7
3-29
3-5
3-53
3-52
3-50
3-51
3-49
3-48
3-40
3-22
3-1
3-15
3-24
3-25
3-26
3-62
3-44
3-45
3-30
3-56
3-46
3-11
3-14
3-21
3-21
3-60
3-34
3-59
3-33
3-58
3-13
3-18
3-31
3-31
3-28
3-32
3-42
3-28
3-32
3-41
3-41
3-42
3-42
3-41
3-28
3-28
3-28
3-28
3-61
3-28
3-28
3-27
3-28
3-28
3-27
3-42
3-28
3-28
3-28
3-32
3-28
3-61
3-28
3-28
3-28
3-28
3-28
3-28
3-28
3-28
3-10
3-10
3-28
3-10
3-28
3-6
3-6
3-38
3-4
3-66
3-67
3-65
3-65
3-28
3-28
3-69
3-27
3-72
3-64
3-28
3-68
3-71
3-73
3-75
3-74
3-70
MICROWAVE DRAWER
KB-3425LS/K/W
KB-4425LS/K/W
MICROWAVE DRAWER HARNESSES
69
KB-3425LS/K/W
KB-4425LS/K/W
OVEN PARTS LIST
Note: The parts marked “∆” may cause undue microwave exposure.
The parts marked “*” are used in voltage more than 250V. "§" MARK: PARTS DELIVERY SECTION
REF. NO. PART NO. § DESCRIPTION Q'TY CODE
4- 1 PCUSGB050MRP0 M Thermal cushion 1 AG
4- 2 PCUSGB051MRP0 M Cross ow motor cushion 1 AG
4- 3 XWHSD80-16180 M Washers 2 AB
4- 4 PCOVPB136MRP0 M Heat cover 1 BD
4- 5 GLEGPB006MRE0 M Leveling screw 4 AE
4- 6 PFPF-B012MRE0 M Heat protect R 1 AW
4- 7 PFPF-B009MRE0 M Heat protect Top 1 AW
4- 8 FHNG-B052MRE0 M Receptacle hinge 2 AK
4- 9 PCOVPB131MRE0 M Hinge cover 2 AD
4-10 PPIPFB001MRE0 M Vent tube 1 AR
4-11 MROD-B008MRE0 M Latch rod 1 AM
4-12 LBSHZB001MRE0 M Bushing 1 AG
4-13 MSPRTB024MRE0 M Bushing spring 1 AA
4-14 LANGTB079MRP0 M Oven spring 2 AE
4-15 PCOVPB127MRE0 M Oven light cover 1 AK
4-16 QSOCLB012MRE0 M Oven light housing 1 AE
4-17 LANG-B018MRE0 M Oven light receptacle 1 AH
4-18 LBNDKB011MRE0 M Light cover retainer 1 AB
4-19 FMOTEB051MRE0 M Blower motor 1 BF
4-20 QSW-PB002MRE0 M Light switch 1 AF
4-21 FH-HZB001MRE0 M Thermister 1 AT
4-22 RLMPTB001MRE0 M Oven lamp 1 AS
4-23 LANGQB065MRP0 M Power cord angle 1 AE
4-24 PCOVPB130MRP0 M Power cover 1 AG
4-25 FSW-MB040MRK0 M Select switch assy 1 AS
4-26 LANGKA760WRP0 M Switch lever 1 AG
4-27 XOTS740P12000 M Screw 37 AA
4-28 TCAUAB073MRR0 M DHHS caution label 1 AB
4-29 GCABDB009MRP0 M Rear plate 1 BE
4-30 QCNCYB001MRE0 M Terminal block kit 1 AK
4-31 FANG-B003MRE0 M Latch motor assy 1 AZ
4-32 LANGQB066MRP0 M Ground plate 1 AD
4-33 LX-BZA041WRE0 M Screw 20 AA
4-34 TCAUAB057MRR0 M Anti-tip label 1 AA
4-35 XTTSD40P30000 M Terminal screws 2 AA
4-36 LBNDKB012MRP0 M Element support hanger 2 AD
4-37 RHET-B006MRE0 M Top heater (3000 W) 1 AX
4-38 RHET-B009MRE0 M Bottom heater (2600 W) 1 AW
4-39 XOTWW40P10000 M Screw 8 AA
4-40 FW-VZB273MRE0 M Power supply harness 1 BB
4-41 LANGTB092MRP0 M Motor blower angle 1 AH
4-42 DW-VZB193MRK0 M Harness assy 1 BE
4-43 QFS-TA038WRE0 M Oven thermo 1 AK
4-44 LX-NZB007MRE0 M Terminal block nut 6 AA
4-45 LX-CZB038MRE0 M Door hinge screw 4 AA
4-46 PCOVWB001MRE0 M Insulation tube 1 AC
4-47 GCABUB135MRP0A M Side cabinet R
4-47 GCABUB138MRP0A M Side cabinet R
4-48 GCABUB136MRP0A M Side cabinet L
4-48 GCABUB139MRP0A M Side cabinet L
4-49 PREFHB008MRP0 M Heat reector 2 AL
4-50 PDUC-B143MRH0 M Convection duct 1 AY
4-51 FFAN-B017MRY0 M Convection fan assy 1 AX
4-52 RMOTEB036MRE0 M Convection motor 1 BB
4-53 RHET-B005MRE0 M Convection heater 1 AX
4-54 LX-NZB009MRE0 M Convection fan assy nut 1 AA
4-55 NFANPB007MRE0 M Impeller blade 1 AC
4-56 LX-RZB001MRE0 M "E" retaining clip 1 AB
4-57 PCOVPB145MRF0 M Front cover 1 AM
4-58 PFPF-B014MRP0 M Insulation 1 AG
4-59 PCUSUB087MRP0 M Cushion 1 AE
4-60 PPIPFB003MRE0 M Vent tube adapter 1 AR
4-61 PFIL-B012MRE0 M Catalyst 1 AW
[KB3425LS][KB3425LK] [KB4425LS][KB4425LK] 1 BC
[KB3425LW] [KB4425LW] 1 BC
[KB3425LS][KB3425LK] [KB4425LS][KB4425LK] 1 BC
[KB3425LW] [KB4425LW] 1 BC
70
KB-3425LS/K/W
6
45
1
2
3
6
45
1
2
3
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
4-42
Actual wire harness may be different from illustration.
4-40
4-47
4-26
4-28
4-31
4-17
4-10
4-2
4-24
4-34
4-1
4-23
4-4
4-25
4-19
4-30
4-41
4-14
4-21
4-48
4-29
4-43
4-11
4-13
4-12
4-46
4-20
4-16
4-22
4-15
4-18
4-8
4-9
4-5
4-9
4-8
4-38
4-37
4-36
4-44
4-27
4-27
4-27
4-27
4-35
4-27
4-39
4-33
4-27
4-27
4-27
4-39
4-45
4-45
4-39
4-39
4-39
4-39
4-39
4-6
4-7
4-49
4-49
4-53
4-51
4-54
4-39
4-52
4-39
4-50
4-39
x8
4-3
4-56
4-55
4-57
4-27
4-27
4-27
4-59
4-58
4-32
4-60
4-61
KB-4425LS/K/W
OVEN UNIT
OVEN UNIT HARNESSES
71
KB-3425LS/K/W
KB-4425LS/K/W
OVEN DOOR PARTS LIST
Note: The parts marked “∆” may cause undue microwave exposure.
The parts marked “*” are used in voltage more than 250V. "§" MARK: PARTS DELIVERY SECTION
REF. NO. PART NO. § DESCRIPTION Q'TY CODE
5- 1 DDORFB107MRK0 M Door assy [KB3425LS] [KB4425LS] 1 BY
5- 1 DDORFB106MRK0 M Door assy [KB3425LK] [KB4425LK] 1 BY
5- 1 DDORFB105MRK0 M Door assy [KB3425LW] [KB4425LW] 1 BY
5- 2 PPACGB021MRE0 M Oven door seal gasket 1 AW
5- 3 JHNDPB053MRF0 M Door handle [KB3425LS] [KB4425LS] 1 BB
5- 3 JHNDPB056MRF0 M Door handle [KB3425LK] [KB4425LK] 1 BB
5- 3 JHNDPB057MRF0 M Door handle [KB3425LW] [KB4425LW] 1 BB
5- 4 XOTWW40P10000 M Screw 2 AA
5- 5 XOTS740P12000 M Screw 2 AA
72
KB-3425LS/K/W
6
45
1
2
3
6
45
1
2
3
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
5-1
5-3
5-2
5-4
5-4
5-5
KB-4425LS/K/W
OVEN DOOR
73
KB-3425LS/K/W
KB-4425LS/K/W
PACKING PARTS LIST
Note: The parts marked “∆” may cause undue microwave exposure.
The parts marked “*” are used in voltage more than 250V. "§" MARK: PARTS DELIVERY SECTION
REF. NO. PART NO. § DESCRIPTION Q'TY CODE
6- 1 UAMI-B018MRM0 M Rack 1 AS
6- 2 PSLD-B001MRE0 M Broiler pan insert 1 AW
6- 3 PSRAHB001MRE0 M Broiler pan 1 AW
6- 4 TINSEB437MRK0 M Operation manual 1 AM
6- 5 TINSEB438MRR0 M Installation sheet [KB3425L] 1 AD
6- 5 TINSEB455MRR0 M Installation sheet [KB4425L] 1 AE
6- 6 FAMI-B007MRK0 M Extended rack assy 2 BM
6- 7 FANGKB024MRK0A M Anti-tip kit 1 AV
No part of this publication may be reproduced,
stored in retrieval systems, or transmitted
in any form or by any means, electronic,
mechanical, photocopying, recording, or
otherwise, without prior written permission
of the publisher.
76
2006 SHARP CORP. (5R2.00E) Printed in U.S.A
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