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Sharp R-22GV Service Manual
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Sharp R-22GV Service Manual

Sharp R-22GV Service Manual

Commercial microwave oven
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See also: Operating Manual
R-24GT
BEFORE SERVICING ........................................................................................................................................... 1
MICROWAVE MEASUREMENT PROCEDURE ................................................................................................... 2
FOREWORD .......................................................................................................................................................... 3
PRODUCT SPECIFICATIONS .............................................................................................................................. 4
GENERAL INFORMATION ................................................................................................................................... 4
OPERATION .......................................................................................................................................................... 6
TROUBLE SHOOTING GUIDE/ TEST PROCEDURE ........................................................................................ 11
TOUCH CONTROL PANEL ................................................................................................................................. 19
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................ 28
PICTORIAL DIAGRAM ........................................................................................................................................ 33
CONTROL PANEL CIRCUIT ............................................................................................................................... 35
PRINTED WIRING BOARD ................................................................................................................................. 39
PARTS LIST ........................................................................................................................................................ 40
PACKING AND ACCESSORIES ......................................................................................................................... 46
SHARP ELECTRONICS CORPORATION
Service Headquarters:
SERVICE MANUAL
MODELS
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.

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Sharp Plaza,
Mahwah,
COMMERCIAL
MICROWAVE OVEN
R-22GV
R-22GT
R-23GT
R-24GT
New Jersey
07430-2135
R-22GV
R-22GT
R-23GT
R-24GT
S7508R24GT///
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  • Page 1: Table Of Contents

    COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ..............28 PICTORIAL DIAGRAM ............................33 CONTROL PANEL CIRCUIT ..........................35 PRINTED WIRING BOARD ..........................39 PARTS LIST ................................ 40 PACKING AND ACCESSORIES ......................... 46 SHARP ELECTRONICS CORPORATION Service Headquarters: Sharp Plaza, Mahwah, New Jersey 07430-2135...

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

    R-22GV R-22GT R-23GT R-24GT 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...

  • Page 3: 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.

  • Page 4: Microwave Measurement Procedure

    R-22GV R-22GT R-23GT R-24GT 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/cm at any point 5cm or more from the external surface of the oven, measured prior to acquisition...

  • Page 5: Foreword

    COMMERCIAL MICROWAVE OVEN GENERAL INFORMATION R-22GV/ R-22GT/ R-23GT/ R-24GT FOREWORD This Manual has been prepared to provide Sharp Electronics OPERATION Corp. Service Personnel with Operation and Service Informa- tion for the SHARP MICROWAVE OVENS, R-22GV, R-22GT, R-23GT, R-24GT. TROUBLESHOOTING GUIDE...
  • Page 6 WARNING: Improper use of the grounding plug can result in a risk of electric shock. The electrical requirements are 120 Volt, 60 Hz AC only, 20 Amp or more (R-22GV,R-22GT); 230/208 Volt, 60 Hz, AC only, 15 Amp or more (R- 23GT) and 20 Amp or more (R-24GT) fused electrical supply.
  • Page 7 R-22GV R-22GT R-23GT R-24GT VOLTAGE SELECT The R-23GT and the R-24GT have been preset for 230V opera- Power supply tion. cord If you need to change this oven for 208V operation, follow instructions below. 1. Unplug oven. 2. Remove one screw(A) from the Voltage Select Cover located on back of the oven near the bottom.
  • Page 8 (for R-22GV, R-22GT) / 3.1 volts (for R-23GT, R-24GT) output on the filament winding, and approximately 2000 18 sec. 14 sec. volts (for R-22GV, R-22GT) / 2040 volts (for R-23GT, R- 16 sec. 16 sec. 24GT) on the high voltage winding.
  • Page 9 RELAY (2) CUT-OUT (2) (LOWER) CAPACITOR (1) 0.75µF POWER TRANSFORMER (2) (REAR) DOOR SENSING SWITCH CAPACITOR (2) 0.75µF Figure O-1. R-22GV/GT Oven SChematic-OFF Condition MAGNETRON PRIMARY THERMAL POWER INTERLOCK CUT-OUT (1) TRANSFORMER (1) RELAY (1) (UPPER) FUSE 20A (FRONT) PRIMARY...
  • Page 10 RELAY (2) CUT-OUT (2) (LOWER) CAPACITOR (1) 0.75µF POWER TRANSFORMER (2) (REAR) DOOR SENSING SWITCH CAPACITOR (2) 0.75µF Figure O-2. R-22GV/22GT Oven SChematic-IDLE Condition MAGNETRON PRIMARY THERMAL POWER INTERLOCK CUT-OUT (1) TRANSFORMER (1) RELAY (1) (UPPER) FUSE 20A (FRONT) MAGNETRON...
  • Page 11 RELAY (2) CUT-OUT (2) (LOWER) CAPACITOR (1) 0.75µF POWER TRANSFORMER (2) (REAR) DOOR SENSING SWITCH CAPACITOR (2) 0.75µF Figure O-3. R-22GV/22GT Oven SChematic-Cooking Condition MAGNETRON PRIMARY THERMAL POWER INTERLOCK CUT-OUT (1) TRANSFORMER (1) RELAY (1) (UPPER) FUSE 20A (FRONT) MAGNETRON...
  • Page 12 R-22GV R-22GT R-23GT R-24GT DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM Functions: With the door shut, the contacts of the door sensing switch 1. The door release lever is pulled. and the secondary interlock switches (1), (2) are closed and 2.
  • Page 13 (1), (2), door sensing switch and secondary interlock switches (1), (2) before replacing the monitor fuse. If monitor fuse is replaced, the mintor switches (1) and/or (2) must also be replaced. Use part FFS-MA012WRK0 (R-22GV/22GT)/ FFS-MA015WRK0 (R-23GV/24GT) as an assem- bly.
  • Page 14 R-22GV R-22GT R-23GT R-24GT CK = Check / RE = Replace/ RST= Reset B C D E J CK CK H H TEST PROCEDURE PROBLEM CONDITION Home fuse blows when power cord is plugged into wall receptacle Monitor fuse blows when power cord is plugged into wall receptacle.
  • Page 15 R-22GV R-22GT R-23GT R-24GT K K K O CK CK CK CK CK CK CK RST RST...
  • Page 16 The test is only accurate if the power supply line voltage is 208/230 volts for models R-23GT, R24GT and 120 volts for models R-22GV, R-22GT and the oven cavity is clean. Model...
  • Page 17 R-22GV R-22GT R-23GT R-24GT TEST PROCEDURES (CONT'D) PROCEDURE COMPONENT TEST LETTER (HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO MEASURE THE VOLTAGE OF THE FILAMENT AND HIGH VOLTAGE COILS.) HIGH VOLTAGE RECTIFIER (1) AND/OR (2) TEST DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING.
  • Page 18 If the monitor fuse is blown by improper switch operation, the monitor fuse and switch must be replaced with "monitor fuse and switch assembly" part number FFS-BA012WRK0 (for R-22GV/GT) or FFS- BA015WRK0 (for R-23GT/24GT), even if the monitor switch operates normally. The monitor fuse and switch assembly is comprised of a 20 ampere fuse and switch.
  • Page 19 R-22GV R-22GT R-23GT R-24GT TEST PROCEDURES (CONT'D) PROCEDURE COMPONENT TEST LETTER When replacing thermal cut-out, check plastic contents around thermal cut-out. If they are damaged, replace them with each defective thermal cut-out. CAUTION: IF THE THERMAL CUT-OUT INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE, REPLACE THE THERMAL CUT-OUT.
  • Page 20 R-22GV R-22GT R-23GT R-24GT TEST PROCEDURES (CONT'D) PROCEDURE COMPONENT TEST LETTER KEY UNIT TEST If the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon is making good contact, verify that the door sensing switch (stop switch ) operates properly; that is the contacts are closed when the door is closed and open when the door is open.
  • Page 21 (check primary coil resistance which is approximately 270Ω ± 10% for R-22GV/ R-22GT, and approximately 865Ω ± 10% between 208V terminals and 970Ω ± 10% between 230V terminals for R-23GT/R- 24GT).
  • Page 22 R-22GV R-22GT R-23GT R-24GT former. VOLTAGE REGULATION FOR "ERROR" INDICATION During heating, the primary current of the high voltage Voltage Input to Input to transformers also flows through the primary winding of the regulation 208V 230V current transformer CT1. This causes a current to be *Normal +6% excel.
  • Page 23 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. R-23GT/R-24GT:Used (judge for input voltage), R-22GV/R-22GT: Connected to GND. AN5-AN4 Terminal to change functions according to the model.
  • Page 24 R-22GV R-22GT R-23GT R-24GT Pin No. Signal Description Digit selection signal. The relation between digit signal and digit are as ß(60Hz) follows: Digit signal Digit P42 ..... 1st. P43 ....2nd. P44 ..... 3rd. P45 ..... 4th. Normally, one pulse is output in every ß period, and input to the grid of the light-emitting diode.
  • Page 25 R-22GV R-22GT R-23GT R-24GT Pin No. Signal Description 41-48 P17-P10 Segment data signal. Signal similar to P21. 49-56 P07-P00 Segment data signal. Signal similar to P21. 57-59 P37-P35 Terminal not used. Key strobe signal. Signal applied to touch-key section. A pulse signal is input to P27, P26, P25 and P24 terminals while one of G4 line keys on key matrix is touched.
  • Page 26 R-22GV R-22GT R-23GT R-24GT SERVICING 1. Precautions for Handling Electronic Components insulated with an insulating tape. After servicing, be sure to This unit uses CMOS LSI in the integral part of the circuits. replace the leads to their original locations.
  • Page 27 R-22GV R-22GT R-23GT R-24GT PROCEDURE FOR CHECKING/CLEARING 3) Practice for inputting total using times (Ex. 310000 times). SERVICE COUNTS OF MICROWAVE OVEN ... Flashing / ... 0.1sec BUZZER The following procedure enables the servicer to obtain the total DISPLAY INDICATOR TONE...
  • Page 28 #3 : Ex. defrost is paused after 50% of cooking time has lapsed when 5 key 3 : To input using times of Express Defrost, touch EXPRESS DEFROST is entered, otherwise it is paused at the end of each stage. key at above step #A. #4 : For R-22GV, change selectapower key to signal key.
  • Page 29 R-22GV R-22GT R-23GT R-24GT MEMORY READJUSTMENT PROCEDURE 1. To set the standard voltage (for R-23GT / R-24GT) When the IC2 is changed in the control unit, the standard voltage must be set again for power supply check. The power supply must be set 230V within ± 1V, and 230V connector in control unit installed.

  • Page 30: Component Replacement And Adjustment Procedure

    R-22GV R-22GT R-23GT R-24GT COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE CAUTION: DISCONNECT OVEN FROM POWER SUPPLY BEFORE REMOVING OUTER CASE. DISCHARGE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING AFTER REMOVING OUTER CASE. OUTER CASE, REAR CABINET AND POWER SUPPLY CORD REMOVAL To remove the components, procedure as follows.
  • Page 31 2. Remove outer case and rear cabinet referring to "OUTER 3. Where the portions have been snipped off bend the portions flat. No sharp edge must be evident after CASE, REAR CABINET AND POWER SUPPLY CORD removal of the stirrer motor cover.
  • Page 32 R-22GV R-22GT R-23GT R-24GT Replacement of individual component is as follows: 1. Be careful not to damage any of the components on the control unit. 2. When inserting key units ribbon cable through the CONTROL UNIT AND CONTROL PANEL FRAME frame, ensure it is not pinched or bent.
  • Page 33 R-22GV R-22GT R-23GT R-24GT pictorial diagram. Be careful to ensure proper connection switches are operating properly. And check continuity of of the wire leads. the monitor circuit. Refer to chapter "Test Procedure" 4. Make sure that the monitor switches (1), (2) and all other and Adjustment procedure.
  • Page 34 R-22GV R-22GT R-23GT R-24GT tight, moisture (condensation)-tight or light-tight. Therefore, occasional appearance of moisture, light UPPER or sensing of gentle warm air movement around OVEN HINGE oven door is not abnormal and do not of themselves, OUTER CASE indicate a leakage of microwave energy from oven CABINET cavity.
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  • Page 41: Printed Wiring Board

    R-22GV R-22GT R-23GT R-24GT Figure S-7. Printed Wiring Board...

  • Page 42: Parts List

    Power supply cord [R-23GT, R-24GT] 1- 7 DH-HZA009WRK0 Oven thermistor 1- 8 FW-QZA100WRK0 High voltage rectifier assembly 1- 9 FFS-BA012WRK0 Monitor switch and fuse assembly [R-22GT,R-22GV] 1- 9 FFS-BA015WRK0 Monitor switch and fuse assembly [R-23GT, R-24GT] 1-10 QSW-MA020WRE0 Voltage select switch [R-23GT,R-24GT] 1-11 QSW-MA051WRE0...
  • Page 43 VHEHZ4A2///-1 Zener diode (HZ4A2) 3- 2 FPNLCB147WRK0 Control panel frame with key unit [R-22GT, R-23GT, R-24GT] 3- 2 FPNLCB148WRK0 Control panel frame with key unit [R-22GV] 3- 2-1 FUNTKA670WRE0 Key unit [R-22GT, R-23GT, R-24GT] 3- 2-1 FUNTKA671WRE0 Key unit [R-22GV]...
  • Page 44 LSTPCA002WRM0 Latch head 5-17 MLEVPA220WRF0 Head lever 5-18 MSPRCA097WRE0 Latch spring 5-19 HBDGCA065WRE0 Door badge [R-22GT] 5-19 HBDGCA068WRE0 Door badge [R-22GV] 5-19 HBDGCA066WRE0 Door badge [R-23GT] 5-19 HBDGCA067WRE0 Door badge [R-24GT] 5-20 LANGKA768WRP0 Fixing plate upper MISCELLANEOUS 6- 1 TINSEA645WRR0...
  • Page 45 Q'TY CODE 6- 2 TLABHA024WRR0 Menu sticker 6- 3 FW-VZB402WRE0 Switch harness 6- 4 FW-VZB401WRE0 Main wire harness [R-22GV, R-22GT] 6- 4 FW-VZB403WRE0 Main wire harness [R-23GT, R-24GT] 6- 5 LHLDWA023WRE0 Wire saddle 6- 6 LHLDWA047WRE0 Wire saddle S 6- 7...
  • Page 46 To have your order filled promptly and correctly, please furnish the following information. 1. MODEL NUMBER 3. PART NO. 2. REF. NO. 4. DESCRIPTION Order Parts from the authrized SHARP parts Distributor for your area. Defective parts required return should be returned as indicated in the Service Policy.
  • Page 47 R-22GV R-22GT R-23GT R-24GT OVEN AND CABINET PARTS 7-29 4-20 6-11 7-18 4-43 2-5-1 7-25 7-18 7-31 6-12 7-33 4-30 7-18 7-33 7-20 7-22 4-42 7-18 4-26 7-22 7-12 1-15 4-27 7-26 4-41 7-19 4-33 7-24 7-18 1-18 4-13 4-25...
  • Page 48 DOOR PROTECTION SHEET SPADP0336WRE0 WRAP COVER BOTTOM PAD ASSEMBLY FPADBA314WRK0 DOOR PAD SPADF0341WRE0 TRAY HOLDER SPADPA505WRE0 PACKING CASE SPAKCC525WRE0 (R-22GV) SPAKCC523WRE0 (R-22GT) SPAKCC524WRE0 (R-23GT) SPAKCC526WRE0 (R-24GT) PRINTED MATERIAL INSTRUCTION BOOK * Not replaceable items. '95 SHARP CORP. (7K3.050E) Printed in U.S.A...

This manual is also suitable for:

R-22gtR-23gtR-24gt

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