Sharp KB-3401LS Supplemental Service Manual
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Sharp KB-3401LS Supplemental Service Manual

Sharp KB-3401LS Supplemental Service Manual

Free standing range with microwave drawer
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See also: Operating Manual , Installation Manual
SUPPLEMENTAL SERVICE MANUAL
This is a supplemental Service Manual and is quite similar to the base models KB-3300JS/JK/JW; (S74R243KB330J). This
supplemental manual must be used in conjunction with the base model service manual for complete operation, service, safety
and replacement parts information.
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..)
BEFORE SERVICING ....................................................................................................... INSIDE FRONT COVER
WARNING TO SERVICE PERSONNEL ................................................................................................................. 3
MICROWAVE MEASUREMENT PROCEDURE ..................................................................................................... 5
FOREWORD AND WARNING ............................................................................................................................... 7
PRODUCT SPECIFICATIONS ............................................................................................................................... 8
POWER CONNECTION ....................................................................................................................................... 0
ANTI-TIP DEVICE ................................................................................................................................................ 2
CONTROL LAYOUT ............................................................................................................................................. 3
SCHEMATICS ...................................................................................................................................................... 4
TOUCH CONTROL PANEL ASSEMBLY .............................................................................................................. 8
OVEN/MICROWAVE DRAWER DISASSEMBLY .................................................................................................. 23
WIRING DIAGRAMS ............................................................................................................................................ 33
PRINTED WIRING BOARDS ............................................................................................................................... 39
PARTS LIST ......................................................................................................................................................... 44
PACKING AND ACCESSORIES .......................................................................................................................... 56
SHARP ELECTRONICS CORPORATION
This document has been published to be used for after sales service only. The contents are subject to change without notice.
FREE STANDING RANGE
WITH MICROWAVE DRAWER
MODELS
KB-340LW pictured

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KB-3401LS
KB-3401LK
KB-3401LW
KB-3401LS
KB-3401LK
KB-3401LW
S76R266KB3401F
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  • Page 1: Table Of Contents

    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.

  • Page 2: Precautions To Be Observed Before And During Servicing To Avoid Possible Exposure To Excessive Microwave Energy

    Before servicing an operative unit, perform a microwave emission check as per the Microwave Measure- ment Procedure outlined in this service manual. If microwave emissions level is in excess of the specified limit, contact SHARP ELECTRONICS CORPO- RATION immediately @-800-237-4277.

  • Page 3: Warning To Service Personnel

    KB-3401LS KB-3401LK KB-3401LW WARNING TO SERVICE PERSONNEL Range units contain circuitry capable of producing very high voltage and current, contact with following parts may result in a severe, possibly fatal, electrical shock. (Example) High Voltage Capacitor, High Voltage Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness, Heating Elements, etc..

  • Page 4: Safe Servicing Practices

    6. Prior to returning the product to service, ensure that: • All electrical connections are correct and secure • All electrical leads are properly dressed and secured away from sharp edges, high-temperature components, and moving parts • All non-insulated electrical terminals, connectors, heaters, etc. are adequately spaced away from all metal parts and panels •...

  • Page 5: Microwave Measurement Procedure

    KB-3401LS KB-3401LK KB-3401LW MICROWAVE MEASUREMENT PROCEDURE A. Requirements: ) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven should not exceed mW/cm at any point 5cm or more from the external surface of the oven, measured prior to...
  • Page 6 KB-3401LS KB-3401LK KB-3401LW NOTES...

  • Page 7: Foreword And Warning

    KB-3401LS KB-3401LK / KB-3401LW POWER CONNECTION ANTI-TIP DEVICE FOREWORD This supplemental Manual has been prepared to provide Sharp Elec- tronics Corp. Service Personnel with Operation and Service Informa- SCHEMATICS tion for the SHARP FREE STANDING RANGE WITH MICROWAVE DRAWER, KB-340LS/JK/JW.

  • Page 8: Product Specifications

    KB-3401LS KB-3401LK KB-3401LW OVEN SPECIFICATION ITEM DESCRIPTION Power Requirements 20 /208 - 20/240Volts / 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"...
  • Page 9 KB-3401LS KB-3401LK KB-3401LW MICROWAVE DRAWER SPECIFICATION ITEM DESCRIPTION Power Output 000 watts (IEC TEST PROCEDURE) Operating frequency of 2450MHz Cooking Cavity Dimensions Width 7-/32 Height 5-7/8" .0 Cubic Feet Depth 7-/8" Control Complement Touch Control System Clock ( :00 - 2:59 ) Timer (0 - 99 min.

  • Page 10: Power Connection

    KB-3401LS KB-3401LK KB-3401LW POWER CONNECTION 208/240 VOLT CONNECTION INSTRUCTIONS ACCESS TO TERMINAL BLOCK The range can be set for 208V or 240V. The voltage setting for your Loosen screw on rear access cover and pull down as illustrated in range is pre-set at 240V from the factory. Follow these steps to Figure 6 to access terminal block wiring connection.
  • Page 11 KB-3401LS KB-3401LK KB-3401LW 3 Make sure all connections are tightened securely and replace connections. Tighten all 3 or 4-wire leads to the terminal block. the rear access cover. See Figure 7. Follow wire locations shown in Figure 10. IMPORTANT DO NOT LOOSEN the factory installed nut...

  • Page 12: Anti-Tip Device

    KB-3401LS KB-3401LK KB-3401LW DRILL PILOT HOLES AND FASTEN BRACKET ANTI-TIP DEVICE Drill a -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 NORMAL INSTALLATION STEPS degree downward angle.

  • Page 13: Control Panel

    KB-3401LS KB-3401LK KB-3401LW GLASS CERAMIC COOKTOP WARM ZONE RADIANT SURFACE UNIT RADIANT SURFACE UNIT RADIANT RADIANT SURFACE UNIT SURFACE UNIT HOT SURFACE INDICATOR LIGHTS CONTROL KNOBS CONTROL KNOBS CONTROL PANEL SMALL LARGE Cooktop Cooktop KEY GLASS OVEN MICROWAVE KB-3401LS...
  • Page 14 Schematic-Off Condition KB-3401LS KB-3401LK KB-3401LW COOK TOP FUSE RESISTOR 470 kohm 1/2W LINE CROSS CAPACITOR 1.0uF 250V DOOR SWITCH NOISE SUPRESSION COIL DOOR LOCK MOTOR SWITCH LINE BYPASS CAPACITOR LINE BYPASS CAPACITOR 0.0033uF 250V 0.0033uF 250V THERMISTOR CLOSS FLOW DOOR...
  • Page 15 KB-3401LS KB-3401LK COOK TOP SCHEMATIC (DETAIL) KB-3401LW CONTROL INDICATOR LIGHT P1B / INSIDE PROTECTOR OUTSIDE P1A / RIGHT FRONT SURFACE ELEMENT L1 / H1 / H2 / L2 / P1 / CONTROL RIGHT REAR PROTECTOR SURFACE ELEMENT WARMER PROTECTOR SURFACE...
  • Page 16 KB-3401LS KB-3401LK MICROWAVE DRAWER SCHEMATIC (DETAIL) KB-3401LW FUSE RESISTOR 470 kohm 1/2W LINE CROSS CAPACITOR 1.0uF 250V NOISE SUPRESSION COIL LINE BYPASS CAPACITOR LINE BYPASS CAPACITOR 0.0033uF 250V 0.0033uF 250V DOOR SENSING SWITCH HUMIDITY SENSOR COM. FAN MOTOR STIRRER MOTOR...
  • Page 17 KB-3401LS KB-3401LK RANGE SCHEMATIC (DETAIL) KB-3401LW DOOR SWITCH DOOR LOCK MOTOR SWITCH THERMISTOR CLOSS FLOW FAN MOTOR CONV. MOTOR DOOR LOCK MOTOR OVEN LAMP RY10 CONV. HEATER COM. N.O. BOTTOM HEATER TOP HEATER COM. N.O.

  • Page 18: Touch Control Panel Assembly

    KB-3401LS TOUCH CONTROL PANEL ASSEMBLY KB-3401LK KB-3401LW OUTLINE OF TOUCH CONTROL PANEL In addition, the synchronizing signal is available in order The touch control section consists of the following units. to compose a basic standard time in the clock circuit.
  • Page 19 KB-3401LS KB-3401LK KB-3401LW DESCRIPTION OF LSI (IC-1) The I/O signal of the LSIis detailed in the following table. Pin No. Signal Description 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.
  • Page 20 KB-3401LS KB-3401LK KB-3401LW Pin No. Signal Description Signal to reset LSI. Signal is output to reset IC-2, IC-3 and IC-4. 24 - 27 Terminal not used. COM3 - COM0 Connected VC (+5V). 29 - 34 P27- P22 Terminal not used.
  • Page 21 KB-3401LS KB-3401LK KB-3401LW Pin No. Signal Description the signals holds “H” level during microwave cook- Microwave cooking mode Other cooking mode ing and “L” level while not cooking. In other cooking VARI MODE ON TIME OFF TIME ON TIME OFF TIME 00% power 32 sec.
  • Page 22 KB-3401LS KB-3401LK KB-3401LW 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.

  • Page 23: Oven/Microwave Drawer Disassembly

    KB-3401LS KB-3401LK KB-3401LW OVEN / MICROWAVE DRAWER DISASSEMBLY WARNING: Follow all safety precautions beginning on Page 2 before proceeding! Fig. 1 . Before removing Control Panel, take measures to protect the Cook Top surface and keep Microwave Drawer open to prevent scratches.
  • Page 24 KB-3401LS KB-3401LK KB-3401LW Fig. 4 0. Remove screws from Control Panel Frame (Fig 4). Control Panel Frame . Slide Cook Top forward to unlock from Fig. 5 shoulder screws, then remove or reposition (Fig. 5). 2. Remove electrical cover and screws holding the select Fig.
  • Page 25 KB-3401LS KB-3401LK KB-3401LW 4. Remove screws from Microwave top Air Duct and take off (Fig. 7). Fig. 7 Air Duct 5. Remove all screws from Microwave Back Plate (Fig. 7). 6. Lift Back Plate and remove carefully not to damage any wires (Fig. 7).
  • Page 26 KB-3401LS KB-3401LK STOP SWITCH, SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL KB-3401LW . Disconnect the power supply cord. 2. Open the drawer and keep it open. . Re-install each switch in its place. The secondary interlock 3. To discharge the high voltage capacitor, wait for 60 switch is in the lower position and the monitor switch is seconds.
  • Page 27 DRAWER/SLIDE RAIL REMOVAL KB-3401LS KB-3401LK DRAWER ASSEMBLY AND CHOKE REMOVAL KB-3401LW . Disconnect the power supply cord. NOTE: 2. Open the drawer and keep it open. To remove only the Fig. D-1 3. To discharge the high voltage capacitor, wait for 60 Microwave Drawer, follow steps seconds.
  • Page 28 KB-3401LS KB-3401LK KB-3401LW OVEN DOOR REMOVAL OVEN DOOR ASSEMBLY REMOVAL . Disconnect the power supply cord. Fig. O-1 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.
  • Page 29 KB-3401LS KB-3401LK KB-3401LW OVEN BAKE ELEMENT REMOVAL . 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).
  • Page 30 KB-3401LS KB-3401LK KB-3401LW BLOWER MOTOR REMOVAL . 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.
  • Page 31 KB-3401LS KB-3401LK KB-3401LW CONVECTION MOTOR/IMPELLER BLADE REMOVAL . 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).
  • Page 32 KB-3401LS KB-3401LK KB-3401LW COOK TOP RADIANT HEATERS/HOT SURFACE INDICATOR REMOVAL . 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.

  • Page 33: Wiring Diagrams

    KB-3401LS KB-3401LK KB-3401LW CONTROL PANEL WIRING DIAGRAM...
  • Page 34 COOK TOP WIRING DIAGRAM KB-3401LS KB-3401LK KB-3401LW...
  • Page 35 KB-3401LS MICROWAVE DRAWER WIRING DIAGRAM KB-3401LK KB-3401LW BLUE COLOR HOUSING...
  • Page 36 MICROWAVE DRAWER WIRING DIAGRAM KB-3401LS KB-3401LK KB-3401LW...
  • Page 37 RANGE POWER SUPPLY WIRING DIAGRAM KB-3401LS KB-3401LK KB-3401LW...
  • Page 38 RANGE WIRING DIAGRAM KB-3401LS KB-3401LK KB-3401LW (N.C.) (N.O.) (COM)

  • Page 39: Printed Wiring Boards

    KB-3401LS KB-3401LK KB-3401LW...
  • Page 40 KB-3401LS KB-3401LK KB-3401LW...
  • Page 41 KB-3401LS KB-3401LK KB-3401LW VRS1 RY7 RY8 Figure S-4. Printed Wiring Board of Power Unit...
  • Page 42 KB-3401LS KB-3401LK KB-3401LW...
  • Page 43 KB-3401LS KB-3401LK KB-3401LW...

  • Page 44: Parts List

    KB-3401LS KB-3401LK KB-3401LW 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...
  • Page 45 KB-3401LS KB-3401LK KB-3401LW CONTROL PANEL 1-18 1-17 1-13 1-18 1-16 1-12 1-17 1-10 1-13 1-15 1-12 1-11 1-12 1-12 1-11 1-14 1-13 1-19 1-13 Actual wire harness may be different from illustration. CONTROL PANEL HARNESS...

  • Page 46: Cook Top Parts List

    KB-3401LS KB-3401LK KB-3401LW 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...
  • Page 47 KB-3401LS KB-3401LK KB-3401LW COOK TOP 2-16 2-19 2-21 2-12 Front view 2-17 2-12 Rear view 2-20 2-21 2-11 2-10 2-14 2-15 COMMON PARTS 2-18 2-13 2-12 2-13 Actual wire harness may be different from illustration. 2-12 COOK TOP HARNESS...
  • Page 48 KB-3401LS KB-3401LK MICROWAVE DRAWER PARTS LIST KB-3401LW 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...
  • Page 49 KB-3401LS KB-3401LK KB-3401LW REF. NO. PART NO. § DESCRIPTION Q'TY CODE 3-58 JHNDPB052MRM0 Door handle [KB3401LS] 3-58 JHNDPB054MRM0 Door handle [KB3401LK] 3-58 JHNDPB055MRM0 Door handle [KB3401LW] 3-59 FGLSPB002MRY0 Oven tray assy 3-60 GCOVHB053MRF0 Choke cover 3-61 LX-CZB027MRE0 Shoulder screw 3-62...
  • Page 50 KB-3401LS KB-3401LK KB-3401LW MICROWAVE DRAWER MICROWAVE DRAWER HARNESSES 3-64 3-47 3-55 3-65 3-14 3-28 Actual wire harness may be different from illustration. 3-66 3-11 3-28 3-61 3-28 3-27 3-45 3-39 3-28 3-28 3-15 3-25 3-28 3-57 3-24 3-28 3-27 3-54...
  • Page 51 KB-3401LS KB-3401LK KB-3401LW 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...
  • Page 52 KB-3401LS KB-3401LK KB-3401LW OVEN UNIT OVEN UNIT HARNESSES 4-42 4-40 Actual wire harness may be different from illustration. 4-34 4-28 4-26 4-59 4-47 4-49 4-24 4-25 4-10 4-31 4-17 4-19 4-23 4-32 4-41 4-58 4-30 4-43 4-11 4-44 4-13 4-14...
  • Page 53 KB-3401LS KB-3401LK KB-3401LW 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...

  • Page 54: Oven Door

    KB-3401LS KB-3401LK KB-3401LW OVEN DOOR...
  • Page 55 KB-3401LS KB-3401LK KB-3401LW 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...

  • Page 56: Packing And Accessories

    KB-3401LS KB-3401LK KB-3401LW PACKING PACKING CASE SUPPORT CORNERS BOILER INSERT BOILER PAN ANTI-TIP TEMPLATE OPERATION MANUAL INSTALLION MANUAL ANTI-TIP KIT EXTENDED RACK ASSY x 2 OVEN RACK Non-replaceable items BOILER PAN RACK...
  • Page 57 KB-3401LS KB-3401LK KB-3401LW NOTES...
  • Page 58 KB-3401LS KB-3401LK KB-3401LW NOTES...
  • Page 59 KB-3401LS KB-3401LK KB-3401LW NOTES...
  • Page 60 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. 2005 SHARP CORP. (6R2.00E) Printed in U.S.A...

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