KB-6002LS KB-6002LK KB-6002LW SERVICE MANUAL S76R265KB6002 MICROWAVE DRAWER Sensor M icrowave D rawer MODELS KB-600 LW pictured KB-6002LS KB-6002LK KB-6002LW In the interest of user-safety the unit should be restored to its original condition and only parts identical to those specified should be used.
KB-6002LS KB-6002LK KB-6002LW 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.
KB-6002LS KB-6002LK KB-6002LW 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.. Read the Service Manual carefully and follow all instructions. Before Servicing 1.
KB-6002LS KB-6002LK KB-6002LW 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.
KB-6002LS KB-6002LK KB-6002LW SERVICE MANUAL PRODUCT DESCRIPTION MICROWAVE DRAWER SCHEMATICS KB-6002LS KB-6002LK / KB-6002LW FOREWORD TEST PROCEDURE This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel and Service Information for the MICROWAVE DRAWER, KB-6002LS, KB-6002LK, and KB-6002LW. 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.
KB-6002LS KB-6002LK KB-6002LW MICROWAVE DRAWER SPECIFICATION ITEM DESCRIPTION Power Requirments 120 Volts 14.5 Amperes, 1000 watts 60 Hz Single phase, 3 wire grounded Power Output 1000 watts (IEC TEST PROCEDURE) Operating frequency of 2450MHz Cooking Cavity Dimensions Width 17-11/32 Height 5-7/8" Depth 17-1/8" Width 30" Height 15-9/32" Depth 26-1/16" Touch Control System Clock ( 1:00 - 12:59 ) Timer (0 - 99 min.
GENERAL INFORMATION KB-6002LS KB-6002LK KB-6002LW GROUNDING INSTRUCTIONS This oven is equipped with a three prong grounding plug. It must be plugged into a wall receptacle that is properly installed and grounded in accordance with the National Electrical Code and local codes and ordinances. In the event of an electrical short circuit, grounding reduces the risk of electric shock by providing an escape wire for the electric current.
KB-6002LS KB-6002LK KB-6002LW OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during oven operation. the secondary interlock switch and secondary interlock relay and is mechanically associated with the drawer so that it will function in the following sequence. (1) When the drawer opens from the closed position, the primary interlock relay (RY2) and secondary interlock switch open their contacts. And contacts of the relay (RY1) remains closed.
KB-6002LS KB-6002LK KB-6002LW SENSOR COOKING CONDITION 2. The coil of shut-off relay (RY-1) is energized, but the power transformer is not turned on. 3. After about 16 seconds, the cook relay (RY-2) is energized. The power transformer is turned on, microwave energy is produced and first stage is started. The 16 seconds is the cooling time required to remove any vapor from the oven cavity and sensor. Using the SENSOR function, food is cooked without figuring time, power level or quantity.
H N RED GRN GND "TO SOURCE" NOISE FILTER FUSE 20A RESISTOR 470 k? 1/2W LINE CROSS CAPACITOR 1.0 ? F 275V NOISE SUPRESSION COIL LINE BYPASS CAPACITOR 0.0033 ? F 250V ORG A7 A5 ORG LOW VOLTAGE TRANSFORMER HUMIDITY SENSOR GRN F1 PRIMARY INTERLOCK RELAY WHT COM N.C. RED POWER TRANSFORMER CAPACITOR 1.00 ? F AC 2300V H.V. RECTIFIER RED MAGNETRON 10 M1 GRN GRN GRN GRN GRN N.O.
TEST PROCEDURES PROCEDURE LETTER A KB-6002LS KB-6002LK KB-6002LW COMPONENT TEST TOUCH CONTROL PANEL ASSEMBLY TEST The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore, unlike conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter and ohmmeter.
KB-6002LS KB-6002LK KB-6002LW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 4) 5) 6) 7) B Reconnect all leads removed from components during testing. Re-install the covers. Reconnect the power supply cord after the covers are installed. Run the oven and check all functions. KEY UNIT TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the drawer and block it open. 3. Discharge high voltage capacitor. 4.
KB-6002LS KB-6002LK KB-6002LW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 12.Re-install the outer case (cabinet). 13.Reconnect the power supply cord after the outer case is installed. 14.Run the oven and check all function. D DEFROST TEST WARNING : The oven should be fully assembled before following procedure. (1) Place one cup of water in the center of the tray in the oven cavity. (2) Close the drawer, touch the Defrost pad. Then select Steaks/Chops by touching the number pad 2.
KB-6002LS KB-6002LK KB-6002LW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 11) 12) 13) 14) 15) F Discharge high voltage capacitor. Reconnect all leads removed from components during testing. Re-install the outer case (cabinet). Reconnect the power supply cord after the outer case is installed. Run the oven and check all functions. AH SENSOR TEST Checking the initial sensor cooking condition WARNING : The oven should be fully assembled before following procedure.
KB-6002LS KB-6002LK KB-6002LW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 9-2. Place the container on the center of tray in the oven cavity. 9-3. Close the drawer. 9-4. Touch the TIMER/CLOCK pad once, the POWER LEVEL pad twice and the START pad once. And touch the number pads 1 once and 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.
KB-6002LS KB-6002LK KB-6002LW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST Refer to the disassembly instructions found on Page 16. G 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.
KB-6002LS KB-6002LK KB-6002LW TEST PROCEDURES PROCEDURE LETTER I COMPONENT TEST SECONDARY INTERLOCK 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. 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.
KB-6002LS KB-6002LK KB-6002LW TEST PROCEDURES PROCEDURE LETTER L COMPONENT TEST 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.
KB-6002LS KB-6002LK KB-6002LW TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL 6) 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. The touch control section consists of the following units.
KB-6002LS KB-6002LK KB-6002LW DESCRIPTION OF LSI (IC-1) The I/O signal of the LSIis detailed in the following table. Pin No. Signal I/O Description Terminal to change cooking input according to the Model. By using A/D converter contained in the LSI, DC voltage in accordance with the Model in operation is applied to set up its cooking constant.
KB-6002LS KB-6002LK KB-6002LW Pin No. Signal I/O 27 COM0 OUT 28 29 - 31 32 VL3 P27- P25 SEG20 IN OUT OUT 33 P23 IN 34 P22 IN 35 P21 IN 36 P20 IN 37 P17 OUT 38 P16 OUT 39 P15 OUT 40 P14 OUT 41 P13 OUT 42 P12 OUT 43 P11 OUT 44 P10 OUT 45 P07 OUT 46 P06 OUT Description Common data signal. Connected to LCD signal C4. Connected VC (+5V). Terminal not used. Segment data signal. Connected to LCD segment S24. Signal coming from touch key.
KB-6002LS KB-6002LK KB-6002LW Pin No. Signal I/O 47 P05 OUT 48-52 53 P04-P00 P57 OUT OUT Description 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.
KB-6002LS KB-6002LK KB-6002LW 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.
KB-6002LS KB-6002LK KB-6002LW TOUCH CONTROL PANEL SERVICING 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.
KB-6002LS KB-6002LK KB-6002LW 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.
KB-6002LS KB-6002LK KB-6002LW COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING AGAINST HIGH VOLTAGE: Microwave ovens contain circuitry capable of producing very high voltage and current. Contact with the following parts may result in severe, possibly fatal, electric shock. (Example) High Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..
KB-6002LS KB-6002LK KB-6002LW MICROWAVE DRAWER DISASSEMBLY WARNING: Follow all safety precautions as stated at the beginning of this Service Manual before proceeding! 1. Before removing Microwave Drawer, take measures to protect the Drawer louver by either removing the louver or by letting the louver over hang off flat protected surface (Fig 1). x2 Fig. 1 2. Open the Drawer to access the 4 mounting screws holding the unit on to the wall or cabinet opening. (Fig 1). Louver 3.
KB-6002LS KB-6002LK KB-6002LW 7. To remove the Control Panel Frame Assembly, remove the 6 screws holding the CP frame to the C/P angle in the back (Fig 3). Fig. 3 8. Unsnap the top C/P frame assembly away from the C/P frame and unplug all wires. The C/P frame assembly is now free. At this point, you will have access to all parts of the Microwave Drawer. POWER CORD REPLACEMENT 1. Un-hook the black and white AC terminals from the Noise Filter PWB and green ground wire from the back plate.
KB-6002LS KB-6002LK KB-6002LW STOP SWITCH, SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH 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 screw holding the latch hook to the oven flange. 5. Remove the latch hook from the oven flange. 6. Disconnect the wire leads of each switch. 7.
KB-6002LS KB-6002LK KB-6002LW DRAWER/SLIDE RAIL REMOVAL DRAWER ASSEMBLY AND CHOKE 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 both right and left side panels. 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.
EX (COM.)(N.O.) WHT GRN GRN STOP SW EX GRN EARTH 1 2 3 TO CPU CNE GRN GRN 1 2 3 4 5 1 2 3 4 5 6 RED ORG 7 TO CPU CNK 8 OVEN THERMAL CUT-OUT WHT GRY GRY GRY GRY GRY GRY WHT WHT GRY WHT (COM.) (N.O.) SECONDARY INTERLOCK SWITCH EX HOUSING DUAL 1 2 EX EX RED BLK RED (N.O.) (COM.) (UPPER SIDE) RY-2 GRN EX EARTH EX EX BLK ORG ORG ORG (N.O.) (COM.
KB-6002LS KB-6002LK KB-6002LW 1 2 4 3 5 6 A A B B C C D D E E F F G G H H Figure S-2.
KB-6002LS KB-6002LK KB-6002LW 1 2 4 3 5 6 A B B C C Figure S-3.
KB-6002LS KB-6002LK KB-6002LW 1 2 4 3 5 6 A A B B 11 D5 2 RY2 DIP D12 D7 R3 1 J11 C10 J10 N.O. COM. RY3 D CNB D10 D3 D2 D1 C1 1 Q1 D N.O. COM. R10 R1 ZD1 C2 D4 C RY1 CNH C RY5 1 8 1 D11 1 3 RY4 E R11 E T1 F VRS1 4 3 P 7 CNA C11 FUSE F 2.5A 3 G G H H Figure S-4.
3 4 R6 K 2 1 ZD2 1 Q2 B C E R7 WHA CNK 6 C3 + 8 Q3 I C O G C3 R22 C20 9 8 1 CNM 5 Q4 I C O R8 CNX 1 2 ZD4 C5 C6 R11 C10 C8 + C21 + C8 R46 R21 R106 R105 R104 CNJ CF1 CF1 16 C13 J2 2 1 3 J1 J3 J4 J6 K R40 1 R36 R38 R37 R35 IC6 5 4 CNF 3 3 C90 1 S0 C3 S0 C0 C0 R68 R107 R103 R102 R101 R100 C44 D41 C54 D40 R42 R115 C103 R114 C102 R112 C100 C41 C30 C43 R44 Q24 R113 C101 R41 Q95 + C90 C90 R98 R96 R99 R95 1 SP R69 CNN CNN SP S0 5 1 D96 K
KB-6002LS KB-6002LK KB-6002LW CONTROL PANEL PARTS LIST Note: The parts marked “∆” may cause undue microwave exposure. The parts marked “*” are used in voltage more than 250V. REF. NO. 1-1 1-2 1-2 1-3 1-3 1-3 1-4 1-5 1-6 1-7 PART NO.
KB-6002LS KB-6002LK KB-6002LW BOTTOM COVER PARTS LIST Note: The parts marked “∆” may cause undue microwave exposure. The parts marked “*” are used in voltage more than 250V. REF. NO. 2-1 2-2 2-3 2-4 2-5 2-6 2-7 PART NO.
KB-6002LS KB-6002LK KB-6002LW MICROWAVE DRAWER PARTS LIST Note: The parts marked “∆” may cause undue microwave exposure. The parts marked “*” are used in voltage more than 250V. REF. NO.
KB-6002LS KB-6002LK KB-6002LW REF. NO. 3-59 3-60 3-61 3-61 3-61 3-62 3-63 3-64 3-65 3-66 3-67 3-68 3-69 3-70 PART NO.
KB-6002LS KB-6002LK KB-6002LW 2 1 4 3 6 5 MICROWAVE DRAWER 3-70 3-69 A A 3-28 3-14 3-28 3-28 3-28 3-40 3-65 3-49 3-68 3-11 3-28 B B 3-28 3-28 3-27 3-28 3-28 3-15 3-5 3-28 3-28 3-27 3-4 3-42 3-30 3-28 3-29 3-28 3-54 3-28 3-28 3-13 3-26 3-62 C 3-10 3-48 3-1 3-28 3-2 3-7 3-28 3-12 3-22 3-28 3-57 3-9 3-24 3-28 3-44 3-56 3-3 3-25 3-46 C 3-39 3-45 3-18 3-63 3-46 3-53 3-28 3-6 3-36 3-28 3-8 3-32 3-28 3-10 3-28 3-52 3-19 3-10 D 3-51 3-28 3-41
KB-6002LS KB-6002LK KB-6002LW PACKING PARTS LIST Note: The parts marked “∆” may cause undue microwave exposure. The parts marked “*” are used in voltage more than 250V. REF. NO. 4- 1 4- 2 4- 3 PART NO.
KB-6002LS KB-6002LK KB-6002LW NOTES 42
KB-6002LS KB-6002LK KB-6002LW NOTES 43
KB-6002LS KB-6002LK KB-6002LW COPYRIGHT © 2006 BY SHARP CORPORATION ALL RIGHTS RESERVED. 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. Printed in U. S.