R-21HT R-21HV SERVICE MANUAL S7814R21HTP// LIGHT DUTY COMMERCIAL MICROWAVE OVENS 1000W/ R-21HV MODEL ON DEF NO. X2 CHECK COMM ERCIA L MICR O R-21HT R-21HV WAVE O VEN 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-21HT R-21HV 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-21HT R-21HV 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-21HT R-21HV 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-21HT R-21HV SERVICE MANUAL PRODUCT DESCRIPTION LIGHT DUTY COMMERCIAL MICROWAVE OVEN GENERAL INFORMATION R-21HT/ R-21HV FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVENS, R-21HT, R-21HV. OPERATION 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-21HT R-21HV SPECIFICATION ITEM Power Requirements Power Output Case Dimensions Cooking Cavity Dimensions (1.0 Cubic Feet ) DESCRIPTION 120 Volts 14 Amperes 60 Hertz / Single phase, 3 wire grounded 1000 watts (IEC 705 Test Procedure) Operating frequency of 2450MHz Width 20-1/2" (520mm) Height 12-1/8" (309mm) Depth 16" (406mm) Width 13-7/8" (353mm) Height 8-1/8" (207mm) Depth 14-5/8" (370mm) Control Complement Touch Control System Timer (0 - 99 min.
R-21HT R-21HV Electrical Requirements The electrical requirements are a 120 volt 60 Hz, AC only, 15 amp. or more protected electrical supply. It is recommended that a separate circuit serving only this appliance be provided. When installing this appliance, observe all applicable codes and ordinances. A short power-supply cord is provided to reduce risks of becoming entangled in or tripping over a longer cord.
R-21HT R-21HV OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during oven operation. Closing the door activates door sensing switch and secondary interlock switch. (In this condition, the monitor switch contacts are opened.) When oven is plugged in, 120 volts A.C. is supplied to the control unit (Figure O-1). 1. The display will show . . (2) When the door is closed from the open position, the monitor switch contacts open first.
R-21HT R-21HV NOTE: SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. . APPEARED. THERMAL THERMAL CUT-OUT CUT-OUT 125˚C (OVEN) 145˚C (MAG.) B1 MONITOR SWITCH RY2 CONTROL UNIT PRIMARY INTERLOCK RELAY RY3 CONTROL RELAY AC120V 60 Hz CAPACITOR 0.94 µF 2400V B2 OL DOOR SENSING SWITCH OVEN LAMP FM FAN MOTOR MAGNETRON POWER TRANSFORMER A7 A3 RECTIFIER MONITOR FUSE 20A Indicates components with potential above 250 V.
R-21HT R-21HV DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM 3. If the door is opened, and the primary interlock relay (RY2) and secondary interlock switch contacts fail to open, the monitor fuse blows simultaneously with closing of the monitor switch contacts. CAUTION: BEFORE REPLACING A BLOWN MONITOR FUSE TEST THE DOOR SENSING SWITCH, PRIMARY INTERLOCK RELAY (RY2), RELAY (RY3) SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH FOR PROPER OPERATION. (REFER TO CHAPTER "TEST PROCEDURE").
R-21HT R-21HV TROUBLESHOOTING GUIDE Never touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected. When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks. Many of the possible causes of trouble will require that a specific test be performed. These tests are given a procedure letter which will be found in the "Test Procedure "section.
R-21HT R-21HV CK = Check / RE = Replace DIRTY OVEN CAVITY LOW VOLTAGE WRONG OPERATION SHORTED IN POWER CORD SHORT OR OPENED WIRING ANTENNA MOTOR OVEN LAMP OR SOCKET COOLING FAN MOTOR RELAY (RY3) FOIL PATTERN ON P.W.B. KEY UNIT MONITOR FUSE TOUCH CONTROL PANEL PRIMARY INTERLOCK SYSTEM MONITOR SWITCH SECONDARY INTERLOCK SWITCH THERMAL CUT-OUT HIGH VOLTAGE CAPACITOR H.V.
R-21HT R-21HV TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 8. Reconnect the power supply cord after the outer case is installed. 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 (outer case fitted). 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.
R-21HT R-21HV TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST the rectifier is probably defective and should be replaced. 5. Reconnect all leads removed from components during testing. 6. Reinstall the outer case (cabinet). 7. Reconnect the power supply cord after the outer case is installed. 8. Run the oven and check all functions. NOTE: Be sure to use an ohmmeter that will supply a forward bias voltage of more than 6.3 volts. D HIGH VOLTAGE CAPACITOR TEST 1. 2. 3. 4. 5. 6. 7. 8.
R-21HT R-21HV TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 3. Discharge high voltage capacitor. 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 door open and a closed circuit with the door closed. If improper operation is indicated, replace the secondary interlock switch. 5. Reconnect all leads removed from components during testing. 6. Reinstall the outer case (cabinet). 7.
R-21HT R-21HV TEST PROCEDURES PROCEDURE LETTER H COMPONENT TEST BLOWN MONITOR 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 monitor 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 monitor fuse.
R-21HT R-21HV TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 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 Key unit test (Procedure J) to determine if control unit is faulty. 2-1 In connection with pads. a) When touching the pads, a certain group of pads do not produce a signal.
R-21HT R-21HV TEST PROCEDURES PROCEDURE LETTER K COMPONENT TEST RELAY TEST 1. 2. 3. 4. 5. Disconnect the power supply cord, and then remove outer case. Open the door and block it open. Discharge high voltage capacitor. Disconnect the leads to the primary of the power transformer. 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 outer case and check voltage between Pin Numbers.
R-21HT R-21HV TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 6) Reconnect all leads removed from components during testing. 7) Re-install the outer case (cabinet). 8) Reconnect the power supply cord after the outer case is installed. 9) 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 remove outer case. 2) Open the door and block it open.
R-21HT R-21HV TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following units as shown in the touch control panel circuit. (1) Control Unit (2) Key Unit This model has 20 Memory pads. When the oven is shipped, Memory pad 1 to 10 are set as follows: fig.1. Memory No. The principal functions of these units and the signals communicated among them are explained below. 1 2 3 4 5 6 7 8 9 0 1.
R-21HT R-21HV DESCRIPTION OF LSI LSI(IZA897DR) The I/O signal of the LSI(IZA897DR) is detailed in the following table. Pin No. 1 Signal VCC I/O IN 2/3 VEE/AVSS IN Connected to GND 4 5-6 VREF AN7-AN6 IN IN Connected to VC. (+5V) Terminal not used. 7-8 AN5-AN4 IN Terminal to change functions according to the model. Signal in accordance with the model in operation is applied to set up its function. 9-10 AN3-AN2 IN Terminal not used.
R-21HT R-21HV Pin No. Signal I/O 22-24 P44-P42 OUT 25 INT1 IN Description Digit selection signal. Signal similar to P45. Signal synchronized with commercial power source frequency. H : +5V This is basic timing for all time processing of LSI. L : GND 16.7 msec 26 P40 IN Connected to GND through resistor. 27 RESET IN Auto clear terminal. Signal is input to reset the LSI to the initial state when power is supplied.
R-21HT R-21HV Pin No. Signal I/O Description 61 P33 OUT 62 P32 OUT 63 P31 OUT Key strobe signal. Signal applied to touch-key section. A pulse signal is input to P27, P26, P25 and P24 terminals while one of G7 line keys on key matrix is touched. 64 P30 OUT Key strobe signal. Signal applied to touch-key section. A pulse signal is input to P27, P26, P25 and P24 terminals while one of G8 line keys on key matrix is touched. Key strobe signal. Signal applied to touch-key section.
R-21HT R-21HV 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.
R-21HT R-21HV PROCEDURE FOR CHECKING/CLEARING SERVICE COUNTS OF MICROWAVE OVEN 3) Practice for inputting total using times (Ex. 310000 times). ... Flashing / ... 0.1sec BUZZER PAD (Door close) The following procedure enables the servicer to obtain the total using times (cook cycles) since the microwave oven is purchased and the total operation time (hours) since the microwave oven is purchased.
R-21HT R-21HV 5) Practice for cancelling total using times and total operation time (user and service) and all other counter. PAD (Door close) SET SET (within 2.0sec.) DOUBLE QUANTITY CHECK SINGLE SET ... Flashing / ... 0.1sec BUZZER DISPLAY . . . . . . . . . INDICATOR PHONE KEY 0 DISPLAY 0 1 : 9 START No. 1 : 9 A " ": Flicker / DOUBLE PAD CHECK EXPRESS DEFROST ( #2 SELECTATIME 0 #4 SELECTAPOWER 6 SELECTATIME 1,5 SELECTATIME DISPLAY . . . . 0.00 DEF. 0.
R-21HT R-21HV 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. Please follow the instructions below before operating the oven. 1.
R-21HT R-21HV POWER TRANSFORMER REMOVAL 1. Disconnect the power supply cord and then remove outer case. 2. Open the oven door and block it open. 3. Discharge high voltage capacitor. 4. Disconnect the filament leads of power transformer from high voltage capacitor and the magnetron. 5. Disconnect the H.V. wire from the power transformer. 6. Disconnect the main wire harness from the power transformer. 7. Remove the two (2) screws holding the transformer to base plate. 8. Remove the transformer. 9.
R-21HT R-21HV OVEN LAMP AND LAMP SOCKET REMOVAL Oven lamp socket 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. Lift up the oven lamp socket from air intake duct. 5. Pull the wire leads from the oven lamp socket by pushing the terminal hole of the oven lamp socket with the small flat type screw driver. 6. Now, the oven lamp socket is free.
R-21HT R-21HV 4. Install the fan blade to the shaft of fan motor by pushing the fan blade with a small, light weight, ball peen hammer or rubber mallet. CAUTION: * Do not hit the fan blade hard when installing because the bracket may be disfigured. * Make sure that the fan blade rotates smooth after installation. * Make sure that the axis of the shaft is not slanted. 5. Install the fan duct to the oven cavity rear plate with the one (1) screw. 6. Insert the tabs of the capacitor holder to the fan duct. 7.
R-21HT R-21HV oven cavity. 7. Remove the latch hook. 8. Push the retaining tab outward slightly and remove the switch. Re-install 1. Re-install each switch in its place. The door sensing switch and monitor switch are in the lower position and the secondary interlock switch is in the upper position. 2. Re-connect wire leads to each switch. Refer to pictorial diagram. 3. Secure latch hook (with two (2) mounting screws) to oven flange. 4.
R-21HT R-21HV RE-INSTALL OF THE DOOR 1. Re-install all door parts except the choke cover. 2. Catch two (2) pins of door panel on two (2) holes of upper and lower oven hinges. 3. Re-install choke cover to door panel by pushing. Choke Cover NOTE: After any service to the door; (A) Make sure that door sensing switch and secondary interlock switch are operating properly. (Refer to chapter "Test Procedures".).
R-21HT R-21HV INSTALLATION OF CERAMIC SHELF 1. Disconnect the power supply cord. 2. Open the door and block it open. 3. Make sure that the smooth surface of the ceramic shelf face up. 4. Make sure that the rubber packing without a fin of the ceramic shelf faces the front of the oven. NOTE: The three (3) rubber packings with the fins and the one (1) rubber packing without a fin are attached to the four (4) edges of the ceramic shelf.
1 2 7 CN-G 1 2 T1 IC1 CONTROL UNIT BLU BLU YLW ORG YLW YLW RED RED 2 GRY 1 GRN CN-B 5 GRY 4 3 2 1 BLU CN-A G 1 G G R R N N 3 4 32 WHT GRN GRY YLW 5 RED WHT WHT BLK WHT ORG ORG BRN BLU BLK FUSE & HOLDER THERMAL CUT-OUT 145°C(MAG.) POWER TRANSFORMER MAGNETRON H.V. CAPACITOR HIGH VOLTAGE COMPONENTS FAN MOTOR NEUTRAL 5 Figure S-1. Pictorial Diagram WHT ANTENNA MOTOR CONNECTOR EARTH GRY WHT GRN POWER SUPPLY CORD 4 COM. N.O.
A7 MICRO COM NO OVEN LAMP NO ANTENNA MOTOR FAN COM MOTOR AC120V 60Hz A5 (J1) b RY3 RY2 c a JA – Q22 DTD143ES 3 33 – + Q20 DTB143ES D4 D3 – + C2 0.1µ/50v C21 10µ/25v 4 5 B1 D23 11ES1 R70 4.7k C70 VC C5 – R3 4.7k 0.1µ/50v 47µ/10v C6 + R5 4.7k C7 60 55 50 45 40 35 33 5 10 15 20 25 30 32 P30 P31 P32 P33 P34 P35 P36 P37 P00 P01 P02 P03 P04 P05 P06 P07 P10 P11 P12 P13 P14 P15 P16 P17 P20 P21 P22 P23 P24 P25 P26 P27 IC3 R83 4.7k R82 4.7k R81 4.7k R80 4.
A7 MICRO COM NO OVEN LAMP NO ANTENNA MOTOR FAN COM MOTOR AC120V 60Hz A5 (J1) b RY3 RY2 c a JA D4 D3 – + Q22 DTD143ES 3 34 – + Q20 DTB143ES D2 – + C2 0.1µ/50v C21 10µ/25v 4 IC2 VC SP1 R40 2.7k 5 B1 D23 11ES1 R70 4.7k C70 VC ZD2 HZ4A2 C5 – R3 4.7k 0.1µ/50v 47µ/10v C6 + R5 4.
R-21HT R-21HV 1 2 4 3 1 5 6 13 DIP A A F R3 3 1 2 16 ZD2 IC3 (CN - D) 1 15 C (4) 5 6 (J3) (J4) 7 60 64 3 C70 R70 3 (C64) (R65) C8 R4 (J5) (J6) C4 D R40 SP1 D21 E 10 (JB) (J9) (D10) B MICRO 1 (C10) B Q22 (R102) E (JF) (C63) (R66) C3 (JE) (JC) 1 (C62) 1 CN - B (R64) (R63) 9 (C101) (C60) (JD) (JA) (Q23) D22 MICRO 2 Q1 (R1) (ZD1) E (R2) (R101) B C1 11 (TB2) (15) (16) E Q3 DANGER-CERTAIN PART IS INTENTIONALLY NOT GROUNDED AND MAY PRESENT A RISK OF
R-21HT R-21HV 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-21HT R-21HV REF. NO. R80-88 RY2 RY3 SP1 T1 VRS1 ZD2 3- 2 3- 2 3- 2-1 3- 2-1 3- 2-2 3- 2-2 3- 2-3 3- 3 3- 4 PART NO. VRD-B12EF472J RRLY-A101DRE0 RRLY-A094DRE0 RALM-A014DRE0 RTRNPA094DRE0 RH-VZA032DRE0 VHEHZ4A2///-1 FPNLCB388WRK0 FPNLCB389WRK0 FUNTKA880WRE0 FUNTKA881WRE0 GCOVAA260WRP0 GCOVAA264WRP0 GMADIA109WRF0 TCAUAA076WRR0 XEPSD30P08XS0 DESCRIPTION Resistor 4.
R-21HT R-21HV REF. NO. 5-15 5-16 5-17 5-18 5-18 5-19 5-20 PART NO.
R-21HT R-21HV 2 1 4 3 7-3 6 5 OVEN AND CABINET PARTS 7-3 2-1 A A 7-3 1-10 1-9 4-28 7-13 7-3 6-6 4-9 B B 4-10 7-13 6-7 4-25 7-6 7-12 4-32 1-4 6-5 1-13 4-26 4-34 7-13 7-1 4-26 6-3 C 4-24 6-4 4-27 4-14 1-4 C 4-15 7-7 7-7 4-15 4-36 4-2 1-1 4-16 7-9 7-10 1-8 7-11 D D 4-23 1-12 4-20 4-21 4-24 4-20 4-21 4-22 4-18 7-8 7-7 4-21 4-20 1-7 E 4-33 4-19 7-2 4-13 7-4 E 7-1 7-4 4-29 1-11 7-1 4-31 1-15 7-7 4-6 7-1 1-6 4-3 4-8 4-30 1-3 F 4-12 F 1-1
R-21HT R-21HV 2 1 4 3 6 5 3-1 CONTROL PANEL PARTS A A 3-4 3-2 3-4 3-2-3 B B 3-4 3-2-2 3-4 3-3 C C DOOR PARTS 3-2-1 5-15 D 5-17 D 5-16 5-13 5-2 5-16 5-20 E E 5-4-2 5-16 5-13 5-16 x4 5-4 5-1 5-4-1 5-4-3 5-16 x2 5-16 F 5-12 5-14 F 5-8 5-7 5-19 5-9 5-18 5-12 5-11 G G 5-3 5-8 5-19 MISCELLANEOUS 5-6 5-5 6-2 6-9 5-10 H H Actual wire harness may be different from illustration.
R-21HT R-21HV PACKING AND ACCESSORIES TOP PAD ASSEMBLY (FPADBA385WRK0) WRAP COVER (SSAKHA034WRE0) TRAY HOLDER DOOR PROTECTION SHEET (SPADFA435WRE0) (SPADPA204WRE0) 6-7 MENU STICKER 6-1 INSTRUCTION BOOK the avity Into en C v O BOTTOM PAD ASSEMBLY (FPADBA386WRK0) PACKING CASE Not Replaceable Items.
R-21HT R-21HV COPYRIGHT © 1998 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. '98 SHARP CORP. (7S2.530E) Printed in U.S.
