SHARP KB3425L, KB-3425JK, KB-3425JW, KB-4425JS, KB-442 Service Manual

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SERVICE MANUAL

FREE STANDING/SLIDE-IN RANGE

WITH MICROWAVE DRAWER

MODELS

KB-3425LS/K/W KB-4425LS/K/W

S66R264KB442L

KB-3425LS KB-3425LK KB-3425LW

KB-4425LW pictured

WARNING TO SERVICE PERSONNEL:

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

MICROWAVE MEASUREMENT PROCEDURE .....................................................................................................5

FOREWORD AND WARNING ............................................................................................................................... 7

PRODUCT SPECIFICATIONS ............................................................................................................................... 8

POWER CONNECTION ....................................................................................................................................... 10

ANTI-TIP DEVICE ................................................................................................................................................ 12

CONTROL LAYOUT ............................................................................................................................................. 13

SCHEMATICS ...................................................................................................................................................... 14

TEST PROCEDURES .......................................................................................................................................... 18

TOUCH CONTROL PANEL ASSEMBLY .............................................................................................................. 29

OVEN/MICROWAVE DRAWER DISASSEMBLY .................................................................................................. 40

WIRING DIAGRAMS ............................................................................................................................................ 52

PRINTED WIRING BOARDS ............................................................................................................................... 58

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.

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.

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.

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.

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,

high-temperaturecomponents, and moving parts

• Allnon-insulated electricalterminals, connectors,heaters,etc. areadequately

spaced away from all metal parts and panels

• All safety grounds (both internal and external) are correctly and securely

connected

• All panels are properly and securely reassembled

KB-4425LS/K/W

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

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.

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.

KB-3425LS/K/W KB-4425LS/K/W

NOTES

SERVICE MANUAL

KB-3425LS/K/W KB-4425LS/K/W

FREE STANDING /SLIDE-IN RANGE

WITH MICROWAVE DRAWER

KB-3425LS / KB-3425LK / KB-3425LW KB-4425LS / KB-4425LK / KB-4425LW

FOREWORD

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

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

Thermal Oven Heating Elemants Top - 3000W Bottom - 3000W Rear - 2500W

Case Dimensions Width 29-7/8" Height 36" Depth 27-7/8

Cooking Cavity Dimensions Width 22-5/8" Height 15-13/16"

3.6 Cubic Feet Depth 18"

Cook Top Heating Elements Two 6" - 1200W

One 8" - 2000W

One 6"/9" - 1200/2400W One 6" - 100W

Control Complement Touch Navigation System Clock ( 1:00 - 12:59 ) Timer (0 - 99 min. 99 seconds)

Kitchen Timer, Cooktop Warm, Stop/Clear, Oven Light, Start, LOWER OVEN

Oven Cavity Light 40W x 1

Safety Standard UL Listed

Weight Approx. 260 lbs.

MICROWAVE DRAWER SPECIFICATION

ITEM DESCRIPTION

Power Output 1000 watts (IEC TEST PROCEDURE) Operating frequency of 2450MHz

Cooking Cavity Dimensions Width 17-11/32 Height 5-7/8"

1.0 Cubic Feet Depth 17-1/8"

Control Complement Touch Navigation System Clock ( 1:00 - 12:59 ) Timer (0 - 99 min. 99 seconds)

Microwave Power for Variable Cooking

Repetition Rate;

P-HI .................................................. Full power throughout the cooking time

P-90 ..................................................................... approx. 90% of Full Power

P-80 ..................................................................... approx. 80% of Full Power

P-70 ..................................................................... approx. 70% of Full Power

P-60 ..................................................................... approx. 60% of Full Power

P-50 ..................................................................... approx. 50% of Full Power

P-40 ..................................................................... approx. 40% of Full Power

P-30 .................................................................... approx. 30% of Full Power

P-20 ..................................................................... approx. 20% of Full Power

P-10 ..................................................................... approx. 10% of Full Power

P-0 ..................................................... No power throughout the cooking time

KB-3425LS/K/W KB-4425LS/K/W

Kitchen Timer, Cooktop Warm, Stop/Clear, Oven Light, Start, LOWER OVEN, Start/ Minute Plus,

UPPER MICROWAVE OVEN, OPEN, CLOSE.

Oven Cavity Light Yes

Safety Standard UL Listed FCC Authorized

DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J

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

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 6

Figure 3 Figure 4

3 & 4-WIRE ELECTRICAL WALL RECEPTACLE TYPES & RECOMMENDED MOUNTING ORIENTATION ON WALL

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

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

3 & 4-WIRE PERMANENT WIRE CONNECTIONS

3–wire permanent connection – followsteps 1,2 and 5 below. 4–wire permanent connection – followall steps below.

Beforewiringthe range,reviewthe suggestedpowersourcelocation drawings in Figure 2. If connecting to a 4-wire electrical system:

1 Follow the manufacturer s Installation Instructions supplied

with the strain relief clamp and install.

2 Strip insulation away from the ends of the permanent wiring

for line 1, line 2 and neutral; also strip ground wire on 4-wire

Note: Install strain-relief clamp. Center or white wire must always be attached to the center terminal on block.

Connect neutral (white or center) here.

Connect line 1 here.

Connect line 2 here.

A user supplied strain-relief clamp must be installed at this location. It requires 13/8-inches (3.5 cm) diameter cord kit hole.

Figure 9

A user supplied strainrelief clamp must be installed at this location. It requires 13/8-inches (3.5 cm) diameter cord kit hole.

Connect green insulated copper ground wire with ground screw here.

Cut ground strap. Discard ground strap & ground plate.

Connect neutral (white or center) here.

Connect line 1 here.

Connect line 2 here.

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

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

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

/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

Anti-Tip Bracket

Wall

Wall Mount

Wall Plate

More Than

11/4"

Max 11/4"

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.

ANTI-TIP DEVICE

NORMAL INSTALLATION STEPS

ANTI-TIP BR ACKET INSTALLATION INSTRUCTIONS IMPO RTANT SAFETY WARNING

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

KB-3425LS/K/W KB-4425LS/K/W

KB-3425LS

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.

RY1

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

CLOSS FLOW FAN MOTOR

EN LAMP

OVEN LAMP

CONV. HEATER

TOP HEATER

MONITOR SWITCH

PRIMARY INTERLOCK

RELAY

RECTIFIER MAGNETRON

POWER TRANSFORMER

CAPACITOR

1.00uF AC 2300V

STIRRER MOTOR

DOOR LOCK MOTOR

N.O.

COM.

N.O.

COM.

RY7

RY4

RY10

RY3

RY8

RY11

CONTROL UNIT

M12

DOOR LOCK MOTOR SWITCH

THERMISTOR

M11

M10

N2 N3

DOOR SWITCH

CONTROL UNIT

OVEN

MICROWAVE DRAWER

SWITCHING POWER SUPPLY UNIT

INSIDE

OUTSIDE

CONTROL

RIGHT FRONT

SURFACE

ELEMENT

44aS2S1

H2 /

P1 /

CONTROL

H1 /

L1 /

L2 /

H2 /

PROTECTOR

CONTROL

INDICATOR LIGHT

HOT SURFACE LIGHT

HOT SURFACE

LIGHT

SWITCHES

H1 /

L1 /

L2 /

H2 /

CONTROL

LEFT REAR

SURFACE

ELEMENT

H1 /

L1 /

L2 /

1b /

2b /

1b /

2b /

1b /

2b /

1b /

2b /

OVEN

THERMAL

CUT-OUT

THERMAL

CUT-OUT

RY9

CONV. MOTOR

C3 C7

E6 E5 E3

RY6

SECONDARY INTELOCK SWITCH

VOLTAGE SWITCH

MICROWAVE DRAWER

DOOR OPEN-CLOSE

MOTOR

DOOR

POSITION

SWITCH

FRONT

M14 M13

DOOR

POSITION

SWITCH

REAR

BOTTOM HEATER

OVEN THERMAL CUT-OUT (THERMAL OVEN)

DOOR SENSING SWITCH

P1 /

PROTECTOR

LEFT FRONT

SURFACE

ELEMENT

P1 /

PROTECTOR

RIGHT REAR

SURFACE

ELEMENT

PROTECTOR

P1 /

PROTECTOR

RY-BRY-C

WARMER

SURFACE

ELEMENT

LOW VOLTAGE

TRANSFORMER

BLK

YLW

BLK

YLW

WHT

BLK

ORG

RED

YLW

RED

BLK

WHT

RED

BRN

RED

YLW

RED

YLW

ORG

YLW

WHT

YLW

RED

YLW

RED

RED RED

BLK

BLK BLK

RED

YLW

WHT

YLW

BLU

BLK

YLW

BRN

YLW

WHT

RED

BRN

BLU

BLK

YLW

WHT

BLK

BLU

BLK

BLU

BLK

YLW

RED

WHT

YLW

RED

BLK

YLW

WHT

BLK

RED

BLK

RED

YLW

RED

BLK

ORG

BRN

BLK

WHT

YLW

WHT WHT

ORG

RED

BLU

WHT

YLW

WHT

BRN

RED

BLK

GRY

BLK

WHT

BLU

BLK

RED RED

BLK

RED

WHT

BLK

BLU

BLK

BRN

GRY

YLW

ORG

YLW

BLK

RED

BLU

WHT

ORG

RED

BLK

RED

BRN

RED

WHT

GRN

BLK

RED

BLK

BRNBLK

BLK

RED

BLK

WHT

ORG

RED

WHT

BRN

ORG

WHT

ORG

RED

BLK

WHT

BRN

WHT

BLK

RED

ORG

P1B /

P1A /

KB-4425LS/K/W

Schematic-Off Condition

COOK TOP SCHEMATIC (DETAIL)

COOK TOP

INSIDE

OUTSIDE

CONTROL

RIGHT FRONT SURFACE ELEMENT

S2S1

H2 /

P1 / 4

CONTROL

H1 /

L1 /

L2 /

H2 /

PROTECTOR

CONTROL

INDICATOR LIGHT

HOT SURFACE LIGHT

HOT SURFACE LIGHT SWITCHES

H1 /

L1 /

L2 /

H2 /

CONTROL

LEFT REAR SURFACE ELEMENT

H1 /

L1 /

L2 /

1b / H

2b / S

1b / H

2b / S

1b / H

2b / S

1b / H

2b / S

P1 / 4

PROTECTOR

LEFT FRONT SURFACE ELEMENT

P1 / 4

PROTECTOR

RIGHT REAR SURFACE ELEMENT

PROTECTOR

P1 / 4

PROTECTOR

WARMER SURFACE ELEMENT

BLK

YLW

BLK

YLW

WHT

BLK

ORG

RED

YLW

RED

BLK

WHT

RED

BRN

RED

YLW

RED

YLW

ORG

YLW

WHT

YLW RED

YLW

RED

BLK

RED

YLW

WHT

YLW

BLU

BLK

YLW

BRN

YLW

WHT

RED

BRN

BLU

BLK

YLW

WHT

BLK

BLU

BLK

BLU

BLK

YLW

RED WHT

YLW

RED

BLK

YLW

WHT

BRN

WHT

P1B / 4

P1A / 4A

KB-3425LS/K/W KB-4425LS/K/W

KB-3425LS/K/W

RY1

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

EN LAMP

MONITOR SWITCH

PRIMARY INTERLOCK

RELAY

RECTIFIER MAGNETRON

POWER TRANSFORMER

CAPACITOR

1.00uF AC 2300V

STIRRER MOTOR

N.O.

COM.

N.O.

COM.

RY11

CONTROL UNIT

N2 N3

MICROWAVE DRAWER

SWITCHING POWER SUPPLY UNIT

OVEN

THERMAL

CUT-OUT

THERMAL

CUT-OUT

SECONDARY INTELOCK SWITCH

VOLTAGE SWITCH

MICROWAVE DRAWER

DOOR OPEN-CLOSE

MOTOR

DOOR

POSITION

SWITCH

FRONT

M14 M13

DOOR

POSITION

SWITCH

REAR

DOOR SENSING SWITCH

RY-BRY-C

LOW VOLTAGE

TRANSFORMER

RED

BLK

BLU

BLK

BRN

GRY

YLW

ORG

YLW

BLK

RED

BLU

WHT

ORG

RED

BLK

RED

BRN

RED

WHT

GRN

BLK

RED

BLK

BRNBLK

BLK

RED

BLK

WHT

ORG

RED

WHT

BRN

ORG

WHT

ORG

RED

BLK

WHT

ORG

KB-4425LS/K/W

MICROWAVE DRAWER SCHEMATIC (DETAIL)

KB-3425LS/K/W

CLOSS FLOW FAN MOTOR

OVEN LAMP

CONV. HEATER

TOP HEATER

DOOR LOCK MOTOR

N.O.

COM.

RY7

RY4

RY10

RY3

RY8

M12

DOOR LOCK MOTOR SWITCH

THERMISTOR

M11

M10

DOOR SWITCH

CONTROL UNIT

OVEN

RY9

CONV. MOTOR

C3 C7

E6 E5 E3

RY6

BOTTOM HEATER

OVEN THERMAL CUT-OUT (THERMAL OVEN)

RY-BRY-C

BLK

RED

BLK

RED

YLW

RED

BLK

ORG

BRN

BLK

WHT

YLW

WHT WHT

ORG

RED

BLU

WHT

YLW

WHT

BRN

RED

BLK

GRY

BLK

WHT

BLU

BLK

RED RED

BLK

RED

WHT

BLK

WHT

BLK

RED

ORG

KB-4425LS/K/W

RANGE SCHEMATIC (DETAIL)

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

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

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.

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

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.

KB-3425LS/K/W

Plunger

COM

R3 R4

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.

R1, R2 : 22Ω ± 1% 1/2W R3 : 4.3kΩ ± 5% 1/4W R4 : 1MΩ ± 5% 1/4W

Element does not heat:

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

OFF LO-MED HI

P2 - P O X X

P2 - 4 O X X

P1 - 2 O X - C X

SURFACE

O X

- open - closed

PILOT

PROCEDURE LETTER

TEST PROCEDURES

COMPONENT TEST

KB-3425LS/K/W KB-4425LS/K/W

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

KB-4425LS/K/W

PROCEDURE LETTER

TEST PROCEDURES

COMPONENT TEST

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

PROCEDURE LETTER

TEST PROCEDURES

COMPONENT TEST

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.

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.

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.

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).

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 Circuit This 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 Circuit The buzzer is responsive to signals from the LSI to

emit audible sounds (key touch sound and completion sound).

14) Synchronizing Signal Circuit The 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.

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.

KB-3425LS/K/W

16.7 msec.

H : +5V

L : GND

H: +5V

L: GND

0.1 sec

2.0 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.

KB-3425LS/K/W

OFF

During

door lock

motor driving

L: GND

H: +5V

OFF

L: GND

H: +5V

OFF

L: GND

H: +5V

OFF

L: GND

H: +5V

OFF

L: GND

H: +5V

OFF

L: GND

H: +5V

OFF

L: GND

H: +5V

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.

KB-3425LS/K/W

OFF

L: GND

H: +5V

OFF

L: GND

H: +5V

OFF

L: GND

H: +5V

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.

KB-3425LS/K/W

ventilation opening for sensing

Sensing part (Open vessel)

Sensing part (Closed vessel)

Thermistors

Operational amplifier

Output voltage

S : Thermistor open vessel

C : Thermistor closed vessel

Absolute humidity (g/m )

utput voltage

Absolute humidity vs, output voltage characteristic

R43 1.8K

VA : +15V VC : +5V

3.5

3.3

R51 47K R45 620K

R46 300K

R47 150K

R48 75K

R49 37.4K

R44 360K

R50 10K

IC5

R40

430

C42 0.1µF

D40 D41

R52 47K

P73

P72

P71

P70

AN5

SW1

SW2

SW3

SW4

SW5

AN6

LSI (IC1)

C. Thermistor in

closed vessel

S. Thermistor in

open vessel

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

OVEN TEMPERATURE/SELF CLEANING CONTROL CIRCUIT

KB-3425LS/K/W KB-4425LS/K/W

OVEN DOOR LOCK MOTOR CONTROL CIRCUIT

OVEN DOOR LOCK MOTOR DETECTION CIRCUIT

KB-3425LS/K/W KB-4425LS/K/W

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.

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

KB-3425LS/K/W

Gasket

Key Fixing Angle

ner

Glass Key Deco

Indicator Lamps

Lens

GND Deco Screw

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. 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

ack

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

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

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.

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

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

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

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

OVEN DOOR REMOVAL

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

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

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

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)

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

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

L1 L2

H1 H2

(LF)

(LF) (LF)

(RF)

123456789

BLK

WHT

RED

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)

(RR)

RED

YLW

(LR)

(RF)

(RR)

YLW

(RF)

(LF)

(LR)

BLK

RED

WHT

RED

L1L1L1L2L2

GRN

YLW

WHT

w/YLW

STRIPE

WHT

w/BRN

STRIPE

WHT

w/BRN

STRIPE

WHT w/BRN STRIPE or BRN

WHT w/YLW STRIPE or YLW

KB-4425LS/K/W

CONTROL PANEL WIRING DIAGRAM

COOK TOP WIRING DIAGRAM

YLW

WHT

WARMER

(CR)

CENTER REAR

1 ZONE

WHT

(JST VLP-12V)

TO INFINITE SW HARNESS

(JST ELP-02V)

TO DRAWER HARNESS

BRNBLKYLWBLUWHT

SURFACE LAMPS

LEFT FRONT

SMALL

LEFT REAR

LARGE

1 ZONE

(LR)

(LF)

WHT

BLK

YLW

YLWBLU

BRN

WHT

YLWBLK

YLW

BLU

BLK

RIGHT FRONT

LARGE

RIGHT REAR

SMALL

2 ZONE

1 ZONE

(RF)

(RR)

YLW

BRN

YLWYLW

WHT

BLK

BLU

BLK

RED

YLW

P1B

WHT

YLW

BLUBRN

L2 RF LF LR RR

P1A

789

BLK

WHT

RED

WHT

BLK

WHT

BRN

YLW

WHT

BRN

4 (RF)

4a(RF)

H1(RR)

H1(LF)

H1(LR)

H2(RF)

H2(RR)

H2(LF)

H2(LR)

KB-3425LS/K/W KB-4425LS/K/W

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

WHTBLUBRN

RED

(N.C.)(N.O.)(COM)

ORG

RED

TO SWITCHING REGULATOR

(JST VHR-3N)

BLK

WHT

GRN

RED

(L2)(N)

(L1)

WHT

WHT BLU

GRY

RED

YLW

BRN

ORG

YLW

BLK

ORG

RED

YLW

BLK RED

RED ORG

BLK

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

ORG

WHTORG

BRN

GRY GRN WHT

BLK

BLU

ORG

YLW

WHT

RED

YLW

(COM.)

GRN

STOP SW

WHT

(N.O.)

421 3 5

BLU YLW

BLK RED

(JST XMR-05V)

DC MOTOR

ORG

EXEX

ORG ORG

EXEX

RED BLK

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.)

(N.O.)

BLKORGREDRED

NOISE FILTER

FAN MOTOR

TO PWB CNB

(JST XAP-05V-1)

(JST XMR-04V)

OVEN THERMAL

CUT-OUT

STIRRER

MOTOR

WHT

ORG

OVEN LAMP

TO CPU CNN

HARNESS

TO COOKTOP

TO CPU HARNESS

124

21 3 4

MONITOR SW

EX EX

RED ORG

SWITCH

SECONDARY INTERLOCK

(JST VHR-3N)

RED

1 2 3

7421 3 5 6

BLK

531 2 4

BLK

RED

6531 2 4 7

TO "L"

TO "N"

TO "RED"

TO "WHT"

RED

BLK

RED

BLK

TO OVEN HARNESS

7 8 9 10 11 12

RED

BLK

BRN

21 3 54 6

TO OVEN HARNESS

BRN

BLK

64 5

RED WHT WHT BLK

31 2 4

RED

BLK

31 2

1 2

(FOR BOTTOM HEATER)

RY-B

MG THERMAL

CUT-OUT

KB-4425LS/K/W

MICROWAVE DRAWER WIRING DIAGRAM

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

TO CPU CNM

BLK

WHT

BLK

TO CPU CNL

65432

431 2

WHT

GRN

65432

RED

ORG

BLK

RED

BRN

YLW

GRN

RED BLK

YLW

BRN

WHT

ORG

WHT

GRY

GRY GRY GRY GRY GRY GRY GRY GRY GRY GRY GRY GRY GRY GRY WHT

87421 3 5 6 1211109

7421 3 5 6

151413121110987421 3 5 66531 2 4 7 8 9 10 11 12 13 14 15

UL TAPE

WHT

MICROWAVE DRAWER CPU WIRING DIAGRAM

KB-4425LS/K/W

KB-3425LS/K/W

SHRINK TUBE

NO.07

NO.08

(VERSAFIT V2)

BLK

RED

(LEFT)

(L1)

(RIGHT)

(L2)

BLK RED

BLK

RED

6531 2 4

INFINITE SWITCH HARNESS

BLK

RED

TERMINAL

(JST VLP-6V)

UL TAPE

KB-4425LS/K/W

RANGE POWER SUPPLY WIRING DIAGRAM

KB-3425LS/K/W

UL TAPE

DOOR SW

(COM.)

(N.O.)

BLK

RED

BLK

RED

UL TAPE

(N.O.)

(N.C.)

OVEN LAMP

WHT

ORG

EXEX

WHT

LOCK MOTOR

WHT

BRN

BLK

RED

BRN

(COM)

VOLTAGE

SWITCH

TOP HEATER

BLK

RED

CAPACITOR

RED

BLU

ORG

THERMISTOR

(MOLEX 5559-02P)

CONVECTION

MOTOR

(JST ELP-03V)

BLK

RED

BLU

BRN

(N.C.)

(N.O.)

RED

(COM)

YLW

SWITCH

LOCK MOTOR

FAN MOTOR

CROSS FLOW

WHT

WHTYLW

RED

CUT-OUT

OVEN THERMAL

567

RED

YLW

BRN

RED

BLK

ORG

TO CPU HARNESS

(JST XMR-07V)

BLK

REDBLK BLK

CONVECTION

HEATER

BOTTOM

HEATER

(JST VLR-12V)

TO DRAWER HARNESS

RED

BLK

RED

BLK

ORG

RED

BRN

RED

BLK

YLW

WHT

87421 3 5 6 9 10 11 12

TO DRAWER HARNESS

(JST VLR-06V)

RED

WHT

BLK

31 2

BRN

BLK

64 5

123

456

VOLTAGE SW (COM)

VOLTAGE SW (N.C.)

VOLTAGE SW (N.O.)

(JST VLR-06V)

TO DRAWER HARNESS

DOOR SW (N.O.)

DOOR SW (COM)

LOCK MOTOR SW (COM)

LOCK MOTOR SW (N.O.)

LOCK MOTOR SW (N.C.)

THERMISTOR

432

(JST XMR-07V)

TO CPU HARNESS

432

TO DRAWER HARNESS

(JST VLR-12V)

101112

L1 / OVEN TEMP.FUSE(L1)

OVEN TEMP.FUSE(L1)

TOP HEATER(L1)

OVEN LAMP(L1)

TOP HEATER(L2)

DOOR LOCK MOTOR(L1)

BOTTOM HEATER(L2)

CONVECTION MOTOR(L1)

CONVECTION HEATER(L2)

FAN MOTOR(L1)

L2 / CONVECTION MOTOR(L2)

DOOR LOCK MOTOR(N)

BLK

WHT

RED

(L1)

(LEFT) (CENTER)

(RIGHT)

(L2)(N)

TERMINAL

RANGE WIRING DIAGRAM

KB-4425LS/K/W

KB-3425LS/K/W

4 5

A-6

A-4

A-2

A-1

RTRNPA006WRZZ

VRS1

B-3

FUSE

2.5A

2200uF/35V

D1 -- D4

1N4002L x4

CN-A

CN-B

E-5

RY2

1.5K 1/4W

ZD1

RY1

RY3

RY4

RY5

C-1

D10

RY6

D11

RY7

D12

RY8

E-6

D15 D16 D17

D18

H-1

H-3

H-2

H-4

H-5

H-6

H-7

H-8

H-9

H-10

H-11

H-12

Transformer

AC 120V

60Hz

POWER TRANSFORMER

OL,SM

(DRAWER COM.)

(OVEN COM.)

TOP H.

BOTTOM HEATER RELAY.

CONVECTION HEATER RELAY.

+24V 0V

(DRAWER)

(OVEN)

LOCK

MOTOR

0.1uF/50V

<NOTE>

: IF NOT SPECIFIED, 1SS270A

10G471K

HZ20-1

DU18D1-1P(M)-R-S

150 1W

CN-C

CN-E

CN-J

CN-H

KTC1027

DU18D1-1P(M)-R

150

E-7

H-15

D14

RY10

D-5

D13

RY9

D-1

(COOK TOP)

WARMER

CONV M

FTR-F3AA024E

CN-D

RY5 -- 10

J-1

E-4

E-3

E-2

J-4

J-5

J-6

E-1

J-3

J-2

RY11

H-13

H-14

D-3

C-5

C-7

C-3

B-1

KB-4425LS/K/W

Figure S-2. Power Unit Circuit

KB-3425LS/K/W

4 5

KB-4425LS/K/W

Figure S-3. Control Unit Circuit

KB-3425LS/K/W

4 5

QPWBFA844DRZZ

FA844

S047081

CNE

RY4

RY2

RY6

RY7

RY8

VRS1

D13

CNA

CNJ

RY5

RY1

D9 D10

D16

D17

D15

RY11

RY10

D14

D18

ZD1

CNH

CNB

FUSE 2.5A

D11 D12

CNC

RY3

RY9

CND

DIP

KB-4425LS/K/W

Figure S-4. Printed Wiring Board of Power Unit

KB-3425LS/K/W

4 5

C14

C23

CNX

8 9

B C E

R8 R6 R5

B C

CNN

CF1

CNM

CNL

C90

C21

WHA

C O

R40

CNK

CNF

1 15

QPWBFA851DRZZ

LD1 LD2

R29

R107

C101

R106

C100

R108

R113

R114

C108

R119

R109

C102

R110

R112

C103

R111

C110

R116

R115

R121

C105

R120

C104

R122

R127

R128

C109

R133

R131

R123

C106

R124

R126

C107

R125

C111

R130

R129

R132

R117

R118

R28

R27

TH1

R26

R27

R32

G8W1

C29

C28

C27

C26

C25

R31

C19

C18

LD3 LD4 LD5

LCD1

IC2

IC3

R101 R102 R103 R104

R105

R100

LD10

Q25

R68

R30 R22

R17

R16

D22

D21

R16

Q97

Q95

R98

R99

R96

R95

D97

R97

R58

R57

C52

R54

R53

R64

R66

R67

R65

R51

R45

R46

R47

R48

R49

R61

R56

R55

D20

D40

D41

C43

C17

R44

R43

ZD2

R50

R52

R42

R41

C42

C41

C40

D40

R60

R63

R62

D96

R18

R13

R12

R14

C12

C50

C10

R11

R37

R35

R36

R38

R15

C50

C51

C16

R30

C30

R19

ZD4

C11

IC9

C13

Q26

IC1

IC5

100

R21

R25 R24 R23

Q95

D95

Q10

C15

Q24

C20 C60 C63 C62 C61 J11 J10 C45 C44

C9 R9

R10

ZD3

D19

Q20

IC5

Q22

1 1

9 9

IC8

IC7

Q23

Q21

KB-4425LS/K/W

Figure S-5. Printed Wiring Board of Control Unit

KB-3425LS/K/W

4 5

QPWBFA850DRZZ

C80

C70

C74

C70

C81

R76 R72

R73

R77 R78

R79

C78

C75

C77

C76 R74

C75

C72

IC44

CNG

R97

R86

R85

R84

R83

R82

R81

R80

R71

R89

C73 CF4

R90

R93

R91

R92

C71

(C o n t r o l lock)

(On)

(Set Off)

(On/Off)

1 2 3

4 5 6

7 8

Kitchen

Timer

Cook top

Warm

Setup

Stop

Clear

Stop

Clear

Oven

Light

Lower

Oven

START

PEN

CLO

START

UPPER

MICROWAVE

Minute

Pluse

OVEN

KB-4425LS/K/W

Figure S-5. Printed Wiring Board of Keyboard Unit

KB-3425LS/K/W KB-4425LS/K/W

CONTROL PANEL 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

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 Innite 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

KB-3425LS/K/W

4 5

1-7

1-5

1-1

1-12

1-8

1-16

1-12

1-19

1-2

1-11

1-14

1-11

1-12

1-14

1-18

1-17

1-14

1-10

1-15

1-3

1-4

1-6

1-18

1-13

Actual wire harness may be different from illustration.

1-9

KB-4425LS/K/W

CONTROL PANEL

CONTROL PANEL HARNESS

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

KB-3425LS/K/W

4 5

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

2-13

2-6

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

COMMON PARTS

KB-4425LS/K/W

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

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

4 5

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

3-60

3-34

3-59

3-33

3-58

3-13

3-18

3-31

3-28

3-32

3-42

3-28

3-32

3-41

3-42

3-41

3-28

3-61

3-28

3-27

3-28

3-27

3-42

3-28

3-32

3-28

3-61

3-28

3-10

3-28

3-10

3-28

3-6

3-38

3-4

3-66

3-67

3-65

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

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 reector 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

KB-3425LS/K/W

4 5

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

4-35

4-27

4-39

4-33

4-27

4-39

4-45

4-39

4-6

4-7

4-49

4-53

4-51

4-54

4-39

4-52

4-39

4-50

4-39

4-3

4-56

4-55

4-57

4-27

4-59

4-58

4-32

4-60

4-61

KB-4425LS/K/W

OVEN UNIT

OVEN UNIT HARNESSES

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

KB-3425LS/K/W

4 5

5-1

5-3

5-2

5-4

5-5

KB-4425LS/K/W

OVEN DOOR

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

6- 8 TINSEB392MRR0 M Anti-tip template 1 AD

6- 9 UAMI-B017MRM0 M Broiler pan rack 1 AR

SUPPORT CORNERS

EXTENDED RACK ASSY x 2

BOILER PAN

INSTALLION MANUAL

OPERATION MANUAL

ANTI-TIP TEMPLATE

ANTI-TIP KIT

PACKING CASE

Non-replaceable items

OVEN RACK

6-7

6-1

6-8

6-4

6-5

6-6

6-3

BOILER INSERT

6-2

BOILER PAN RACK

6-9

KB-3425L Shown

PACKING

KB-3425LS/K/W KB-4425LS/K/W

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.

2006 SHARP CORP. (5R2.00E) Printed in U.S.A

SHARP KB3425L, KB-3425JK, KB-3425JW, KB-4425JS, KB-442 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual