R-120DB R-120DK R-120DR R-120DW SERVICE MANUAL S3007R120DPW/ MICROWAVE OVEN MODELS START/MIN UTE LUS STOP/CLE ON DEF LBS QTY CHECK AR HALF PINT R-120DB R-120DK R-120DR R-120DW In the interest of user-safety the oven should be restored to its original condition and only parts identical to those specified should be used.
R-120DB R-120DK R-120DR R-120DW 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.
R-120DB R-120DK R-120DR R-120DW WARNING TO SERVICE PERSONNEL Microwave ovens 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 etc.. Read the Service Manual carefully and follow all instructions. Don't Touch ! Danger High Voltage When the testing is completed, 1.
R-120DB R-120DK R-120DR R-120DW 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.
R-120DB R-120DK R-120DR R-120DW SERVICE MANUAL PRODUCT DESCRIPTION MICROWAVE OVEN R-120DB/ R-120DK/ R-120DR/ R-120DW GENERAL INFORMATION FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVEN, R-120DB, R-120DK, R-120DR, R120DW. 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.
R-120DB R-120DK R-120DR R-120DW PRODUCT DESCRIPTION SPECIFICATIONS ITEM Power Requirements Power Consumption Power Output Case Dimensions Cooking Cavity Dimensions (0.7 Cubic feet) Control Complement Oven Cavity Light Safety Standard DESCRIPTION 120 Volts 60 Hertz Single phase, 3 wire grounded 1030W / Approx.
R-120DB R-120DK R-120DR R-120DW Grounded Receptacle Box CAUTION: DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE ROUND GROUNDING PRONG FROM THIS PLUG. 3-Pronged Plug Grounding Pin 3-Pronged Receptacle OVEN DIAGRAM 1. Oven door with see-through window 2. Safety door latches. The oven will not operate unless the door is securely closed. 3. Door hinges 4. Door seals and sealing surfaces 5. Door handle Pull to the open. 6. Turntable motor shaft 7. Removable turntable support 8.
R-120DB R-120DK R-120DR R-120DW OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during oven operation. filament and the H.V. winding voltage is sent to a voltage doubler circuit. 4. The microwave energy produced by the magnetron is channelled through the waveguide into the cavity feedbox, and then into the cavity where the food is placed to be cooked. 5. Upon completion of the cooking time, the power transformer, oven lamp, etc.
R-120DB R-120DK R-120DR R-120DW C/T FUSE SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR OPENED. 2. COOKING TIME PROGRAMMED. 3. DOOR CLOSED. 4. START/MINUTE PLUS BUTTON PUSHED. MAGNETRON THERMAL CUT-OUT COM. POWER TRANSFORMER N.O. (RY-2) (RY-1) A3 PRIMARY INTERLOCK RELAY CAPACITOR 0.72µF CONTROL UNIT A1 B2 B1 GRN 120V AC 60 Hz DOOR SENSING SWITCH TTM OL MONITOR SWITCH FM RECTIFIER MAGNETRON TURNTABLE MOTOR OVEN LAMP FAN MOTOR SECONDARY INTERLOCK SWITCH Figure O-2.
R-120DB R-120DK R-120DR R-120DW C/T FUSE air is channelled through the oven cavity to remove steam and vapours given off from the heating foods. It is then exhausted through the exhausting air vents at the oven cavity. 1. The C/T fuse blows when the contacts (COM-NO) of the primary interlock relay (RY2) and secondary interlock switch remain closed with the oven door open and when the monitor switch closes. 2.
R-120DB R-120DK R-120DR R-120DW Home fuse blows when power cord is plugged into wall receptacle. C/T fuse blows when power cord is plugged into wall receptacle. OFF CONDITION All letters and indicators do not appear in display when power cord is first plugged into wall outlet. Display does not operate properly when STOP/CLEAR key is touched. (Buzzer should sound and time of day should appear in display.) C/T fuse blows when the door is opened. Fan motor does not operate.
R-120DB R-120DK R-120DR R-120DW TEST PROCEDURES PROCEDURE LETTER A COMPONENT TEST MAGNETRON ASSEMBLY TEST 1. 2. 3. 4. 5. 6. 7. 8. 9. Disconnect the power supply cord, and then remove outer case. Open the door and block it open. Discharge high voltage capacitor. 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.
R-120DB R-120DK R-120DR R-120DW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST (HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO MEASURE THE FILAMENT AND HIGH VOLTAGE.) C HIGH VOLTAGE RECTIFIER TEST 1. 2. 3. 4. Disconnect the power supply cord, and then remove outer case. Open the door and block it open. Discharge high voltage capacitor. Isolate the rectifier from the circuit.
R-120DB R-120DK R-120DR R-120DW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 5. 6. 7. 8. of the switch. The meter should indicate an open circuit with the door open and a closed circuit with the door closed. If improper operation is indicated, replace the secondary interlock switch. Reconnect all leads removed from components during testing. Reinstall the outer case (cabinet). Reconnect the power supply cord after the outer case is installed. Run the oven and check all functions.
R-120DB R-120DK R-120DR R-120DW TEST PROCEDURES PROCEDURE LETTER H COMPONENT TEST BLOWN C/T FUSE TEST 1. 2. 3. 4. Disconnect the power supply cord, and then remove outer case. Open the door and block it open. Discharge high voltage capacitor. If the C/T fuse is blown when the door is opened, check the primary interlock relay, secondary interlock switch and monitor switch according to the "TEST PROCEDURE" for those switches before replacing the blown C/T fuse.
R-120DB R-120DK R-120DR R-120DW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 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. 2-3 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.
R-120DB R-120DK R-120DR R-120DW 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 functions. L COMPU COOK TEST (1) (2) (3) (4) (5) Place one cup of water in the center of the turntable tray in the oven cavity. Open the door, and touch COMPU COOK pad three times. Close the door, and then touch the "START" pad. The oven is in COMPU COOK condition.
R-120DB R-120DK R-120DR R-120DW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 7) Follow the troubleshooting guide given below for repair. STEPS 8) 9) 10) 11) 12) 13) 14) OCCURRENCE CAUSE OR CORRECTION 1 The rated AC voltage is not present between Pin No. 3 of the 2-pin connector (A) and the common terminal of the relay RY2. Check supply voltage and oven power cord. 2 The rated AC voltage is present at primary side of low voltage transformer.
R-120DB R-120DK R-120DR R-120DW DESCRIPTION OF LSI LSI(IXA038DR) The I/O signal of the LSI(IXA038DR) are detailed in the following table. Pin No. 1 Signal VSS I/O IN 2 XIN IN 3 XOUT OUT 4 5 TEST VDD IN IN P21-P22 RESET IN/OUT IN P20 AIN0-AIN2 IN/OUT IN INT0 IN 6-7 8 9 10-12 13 Description Power source voltage: -5V. VSS voltage of power source circuit input. Internal clock oscillation frequency setting input.
R-120DB R-120DK R-120DR R-120DW Pin No. 26-27 Signal P16-17 I/O OUT Description Magnetron high-voltage circuit driving signal. To turn on and off the cook relay (RY2). P-HI The signals holds "L" level during microwave cooking and "H" level while not cooking. OFF H : GND ON OFF 24 sec. P-70 ON 28-34 35 P50-P56 P57 IN/OUT OUT L : -5V OFF Terminal not used. Oven lamp, fan motor and turntable motor driving signal. 16.7 msec. To turn on and off shut off relay (RY1).
R-120DB R-120DK R-120DR R-120DW 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.
R-120DB R-120DK R-120DR R-120DW COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING AGAINST HIGH VOLTAGE: Microwave ovens contain circuitry capable of producing very high voltage and current, contact with 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.. WARNING: Avoid possible exposure to microwave energy.
R-120DB R-120DK R-120DR R-120DW NOTE: When replacing the outer case, the 2 special Torx screws must be reinstalled in the same locations. CAUTION: 1. DISCONNECT OVEN FROM POWER SUPPLY BEFORE REMOVING OUTER CASE. 2. DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING. MAGNETRON REMOVAL 9. Release the H.V. capacitor band from the magnetron air duct. 10.Disconnect the wire leads from magnetron thermal cut-out. 11.
R-120DB R-120DK R-120DR R-120DW 2. When attaching the key unit to the control panel frame, adjust the upper edge and right edge of the key unit to the correct position of control panel frame. 3. Stick the key unit firmly to the control panel frame by rubbing with soft cloth not to scratch. 7. Then lift up the control panel assembly and release it from the oven cavity. 8. Now, the control panel assembly is free. NOTE: 1.
R-120DB R-120DK R-120DR R-120DW with one (1) screw XHTSD40P08RV0 XFPSD40P08K00 as shown in Figure C-3. the bottom plate as shown in Figure C-3. 7. Re-install the turntable motor cover to the bottom plate Screw: XHTSD40P08RV0 or XFPSD40P08K00 or Washer Washer O-ring Apply grease here Base of turntable motor shaft O-ring Turntable motor Figure C-4. Washer and O-ring Installation and Grease Applying. Figure C-3. Turntable Motor Cover COOLING FAN MOTOR REMOVAL 19.
R-120DB R-120DK R-120DR R-120DW Shaft 10.Reinstall the barrier to the oven cavity by fitting the hooks of the barrier into the hols of the rear side of oven cavity. 11.Reinstall all wire leads released from the hole of the fan duct. 12.Connect the wire leads to the fan motor, power supply cord, H.V. capacitor, magnetron, referring to the pictorial diagram. Center of bracket Table DOOR SENSING SWITCH, SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL 1. 2. 3. 4. 5. 3.
R-120DB R-120DK R-120DR R-120DW DOOR REPLACEMENT 8. Re-install door stoper to door panel by pushing. Note: After any service to the door; (A) Make sure that door 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 service, make sure of the following : 1.
H 1 2 BLK 3 26 4 N.O. 5 WHT WHT E Figure S-1. Pictorial Diagram BLU RED RED OVEN LAMP & SOCKET BLK RED WHT BLK NOTE: The neutral (WHT) wire must be connected to the terminal with "N" mark on the power supply cord. POWER SUPPLY CORD 120V 60Hz H.V.
OVEN LAMP TURN TABLE FAN MOTOR 4 B1 a DOOR SWITCH d L1 4.7 RY2 RY1 1 7 D1 4 D2 56 1/2w D4 D3 SP1 PKM22EPT NOTE : D40 Q21 DTD143ES (KRC243M) C1 0.1µ/50v – + VL – + C2 470µ/25v R4 680 1/2w – + C8 47µ/16v VC (J13) (J11) (J12) (J10) Q22 DTA123JSA (KRA105M) (J15) (J14) R6 15k C4 0.
Q10 C10 E C1 B D3 (J1) C2 B Q21 E 2 D4 C20 C21 E 5 SP1 R4 R30 E 6 6 E 3 Q30 R5 B ZD1 B Q20 B - R6 - Q21 3 4 - R20 - Q1 E C4 (C20) C40 ZD1 E R41 C8 C3 L 10 D20 E 12 C3 CF1 - R71 - R72 C62 (C3) R71 11 D40 B R9 C61 R8 R7 J11 J13 J15 J14 J12 J10 R70 (C8) -R7010 C4 2 Q10 13 14 C61 9 C11 D21 1 Q22 12 8 11 D2 3 P S D1 VRS1 F2 F1 7 7 RY2 D20 1 1 CN - A T1 3 4 4 RY1 D20 1 B C60 D22 7 4 3 CN - B 1 D22 L SW4 B (C20) C21 D2 D1 T
R-120DB R-120DK R-120DR R-120DW PARTS LIST Note: The parts marked “ ∆” may cause undue microwave exposure. The parts marked “*” are used in voltage more than 250V. REF. NO. PART NO.
R-120DB R-120DK R-120DR R-120DW REF. NO. 5-10 PART NO.
R-120DB R-120DK R-120DR R-120DW 2 1 4 3 6 5 7-2 OVEN AND CABINET PARTS 7-2 2-1 A A 7-2 7-10 4-5 7-2 7-8 4-6 1-8 B B 7-5 4-4 7-2 4-24 7-10 7-10 1-11 7-3 4-3 C C 4-16 1-5 7-9 7-13 7-14 7-8 7-14 1-6 1-12 1-2 4-25 7-2 7-2 D 4-2 6-9 4-20 4-22 D 7-2 4-9 7-7 1-9 7-2 1-3 1-4 E 6-7 4-21 4-11 E 4-7 1-7 6-2 4-8 4-19 F 6-8 7-12 7-6 6-1 4-12 F 7-10 7-2 7-4 4-18 4-1 1-10 4-15 7-2 4-23 1-1 7-8 4-10 7-2 1-2 G G 1-1 4-13 4-17 7-2 7-2 2-3 7-2 H H
R-120DB R-120DK R-120DR R-120DW 2 1 4 3 6 5 CONTROL PANEL PARTS A A 3-1 7-1 3-2 3-2-1 B B 3-3 5-9 3-2-2 C C 5-8 DOOR PARTS 5-7 5-10 5-10 5-2 D D 5-10 5-1 5-4 E 5-3 E 5-10 5-5 5-6 F F 6-4 MISCELLANEOUS 6-5 6-6 G G Actual wire harness may be different than illustration.
R-120DB R-120DK R-120DR R-120DW PACKING AND ACCESSORIES TOP PAD ASSEMBLY FPADBA418WRKZ DOOR PROTECTION SHEET POLYETHYLENG BAG SPADPA580WRE0 SSAKHA006WRE0 6-3 OPERATION MANUAL 6-2 TURNTABLE TRAY MICROWAVE OVEN BOTTOM PAD ASSEMBLY FPADBA419WRKZ 6-1 TURNRABLE SUPPORT INTO THE OVEN CAVITY PACKING CASE SPAKCD349WREZ [R-120DB] SPAKCD364WREZ [R-120DK] SPAKCD365WREZ [R-120DR] SPAKCD363WREZ [R-120DW] TRAY PAD ASSY (CPADBA269WRKZ) Not replaceable items.
R-120DB R-120DK R-120DR R-120DW COPYRIGHT © 2000 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. 2000 SHARP CORP. (3S2.530E) Printed in U.S.