R-22GV R-22GT R-23GT R-24GT SERVICE MANUAL S7508R24GT/// COMMERCIAL MICROWAVE OVEN MODELS R-22GV R-22GT R-23GT R-24GT 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-24GT TABLE OF CONTENTS Page PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICE TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY ................... INSIDE FRONT COVER BEFORE SERVICING ...............................................
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.
R-22GV R-22GT R-23GT R-24GT 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.
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/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-22GV R-22GT R-23GT R-24GT SERVICE MANUAL PRODUCT DESCRIPTION COMMERCIAL MICROWAVE OVEN GENERAL INFORMATION R-22GV/ R-22GT/ R-23GT/ R-24GT FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVENS, R-22GV, R-22GT, R-23GT, R-24GT. 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-22GV R-22GT R-23GT R-24GT SPECIFICATION ITEM Power Requirements Power Output DESCRIPTION 120 Volts / 2.0 KW (R-22GV, R-22GT) Approx. 17.7A 230/208 Volts / 2.5 kW (R-23GT) Approx. 13A at 208V, 11.9A at 230V 230/208 Volts / 2.9 kW (R-24GT) Approx. 14 A at 208V, 13.
R-22GV R-22GT R-23GT R-24GT VOLTAGE SELECT The R-23GT and the R-24GT have been preset for 230V operation. 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. 3. Remove the Voltage Select Cover and rotate 180 degrees. 4. Reinstall the Voltage Select Cover using one screw(A) removed in Step 2. 5. Plug power cord into wall outlet.
R-22GV R-22GT R-23GT R-24GT OPERATION DESCRIPTION OF OPERATING SEQUENCE circuits to the high voltage components are de-energized, and the digital read-out displays " . " and cooking is cancelled (in the case of Memory cooking). 7.
R-22GV R-22GT R-23GT R-24GT TWO MAGNETRON OPERATION SYSTEM OPERATION OF MAGNETRON Two magnetrons (1), (2) are equipped in order to get higher microwave power output. The primary windings of the power transformers (1), (2) are connected so that each magnetron can be oscillated alternatively according to the frequency of the power supply. Refer to the Figure B-1. COMMERCIAL FREQUENCY (60HZ) POWER OUTPUT BY MAGNETRON 1 POWER OUTPUT BY MAGNETRON 2 SCHEMATIC Figure B-1.
R-22GV R-22GT R-23GT R-24GT SCHEMATIC NOTE: CONDITION OF OVEN 1. FOR 1MINUTE AFTER DOOR OPENED. 2. " . " APPEARS ON DISPLAY. SECONDARY INTERLOCK SWITCH (1) FUSE 20A MAGNETRON THERMAL CUT-OUT (1) (UPPER) PRIMARY INTERLOCK RELAY (1) YLW A3 B2 B1 MAGNETRON (1) (UPPER) RECTIFIER (1) BLK POWER TRANSFORMER (2) (REAR) BLK MAGNETRON THERMISTOR MONITOR SWITCH (2) B3 H3 H1 RY3 RY2 RY1 120V 60Hz GRN A1 MAGNETRON THERMAL CUT-OUT (2) (LOWER) CAPACITOR (1) 0.
R-22GV R-22GT R-23GT R-24GT SCHEMATIC NOTE: CONDITION OF OVEN DOOR CLOSED. SELECTATIME PAD TOUCHED. COOKING TIME PROGRAMMED. START PAD TOUCHED. FUSE 20A SECONDARY INTERLOCK SWITCH (1) PRIMARY INTERLOCK RELAY (1) SECONDARY INTERLOCK SWITCH (2) PRIMARY INTERLOCK RELAY (2) MAGNETRON THERMAL CUT-OUT (1) (UPPER) YLW BLK MAGNETRON (1) (UPPER) RECTIFIER (1) MONITOR SWITCH (2) MONITOR SWITCH (1) MAGNETRON THERMISTOR CAPACITOR (2) 0.
R-22GV R-22GT R-23GT R-24GT DESCRIPTION AND FUNCTION OF COMPONENTS Functions: With the door shut, the contacts of the door sensing switch and the secondary interlock switches (1), (2) are closed and the contacts of the monitor switches (1), (2) are open. 1. When the door is opened, the contact of the door sensing switch and secondary interlock switches (1), (2) are opened first, then the contact of the monitor switches (1), (2) are closed. 2.
R-22GV R-22GT R-23GT R-24GT INTAKE THERMISTOR OVEN LAMPS This thermistor detects ambient air temperature. The thermistor is a negative temperature coefficient type. The temperature around the lower position of control panel is detected through the resistance of the thermistor. If the thermistor remains in a shorted condition for more than 2 minutes, the control will display “EE10” and stop operating.
R-22GV R-22GT R-23GT R-24GT CK = Check / RE = Replace/ RST= Reset TEST PROCEDURE CONDITION A B C D E F F G I J PROBLEM Home fuse blows when power cord is plugged into wall receptacle Monitor fuse blows when power cord is plugged into wall receptacle. OFF CONDITION " . " does not appear in display when power cord is first plugged into wall receptacle. Blower motor does not operate. (Oven lamp(s) and stirrer motors go on for 1 minute after door is opened.
R-22GV R-22GT R-23GT R-24GT J K K K L M N N N O CK CK CK CK CK RST RST CK CK 13
R-22GV R-22GT R-23GT R-24GT TEST PROCEDURES PROCEDURE LETTER A COMPONENT TEST MAGNETRON ASSEMBLY TEST HIGH VOLTAGES ARE PRESENT DURING THE COOK CYCLE, SO EXTREME CAUTION SHOULD BE OBSERVED. DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING. 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-22GV R-22GT R-23GT R-24GT TEST PROCEDURES (CONT'D) PROCEDURE LETTER COMPONENT TEST (HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO MEASURE THE VOLTAGE OF THE FILAMENT AND HIGH VOLTAGE COILS.) C HIGH VOLTAGE RECTIFIER (1) AND/OR (2) TEST DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING. Isolate the rectifier from the circuit.
R-22GV R-22GT R-23GT R-24GT TEST PROCEDURES (CONT'D) PROCEDURE LETTER COMPONENT TEST MONITOR SWITCH (2) MONITOR SWITCH (1) SCREW DRIVER OHMMETER LATCH HOOK H SELECT SWITCHES (1) (4) TEST (FOR R-23GT, R-24GT) Isolate switch and check the contacts by using an ohmmeter with following table. If improper operation is indicated, make the necessary switch adjustment or replacement. Table: Switch Connection Plunger operation Between COM. and NO. Between COM. and NC. COM.
R-22GV R-22GT R-23GT R-24GT TEST PROCEDURES (CONT'D) PROCEDURE LETTER COMPONENT TEST 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. K MAGNETRON THERMISTOR TEST Disconnect connector-H from the CPU unit. Measure the resistance of the thermistor with an ohmmeter.
R-22GV R-22GT R-23GT R-24GT TEST PROCEDURES (CONT'D) PROCEDURE LETTER M COMPONENT TEST 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.
R-22GV R-22GT R-23GT R-24GT TEST PROCEDURES (CONT'D) PROCEDURE LETTER COMPONENT TEST TB1 CT1 c d b P (VRS2) POWER VRS1 (J1) a T1 17 7 POWER 12 damage and examine the transformer with a tester for the presence of layer shortcircuit (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/R24GT). If any abnormal condition is detected, replace the defective parts.
R-22GV R-22GT R-23GT R-24GT VOLTAGE REGULATION FOR "ERROR" INDICATION former. During heating, the primary current of the high voltage transformers also flows through the primary winding of the current transformer CT1. This causes a current to be induced in the secondary winding of CT1 and results in an AC voltage which is determined by R100. This AC voltage is then half wave rectified by D100 and smoothed (filtered) by C100.
R-22GV R-22GT R-23GT R-24GT DESCRIPTION OF LSI LSI(IZA633DR) The I/O signal of the LSI(IZA633DR) is detailed in the following table. Pin No. 1 Signal VCC I/O IN Description Power source voltage: +5V. VC voltage of power source circuit input. VEE/AVSS IN Connected to GND 4 VREF IN Connected to VC. (+5V) 5 AN7 IN Temperature measurement input: INTAKE THERMISTOR.
R-22GV R-22GT R-23GT R-24GT Pin No. 21 Signal I/O P45 OUT Description Digit selection signal. The relation between digit signal and digit are as follows: Digit signal Digit P42 ..................... 1st. P43 .................... 2nd. P44 ..................... 3rd. P45 ..................... 4th. 25 P44-P42 OUT INT1 IN L +5V P42 GND P43 P44 Normally, one pulse is output in every ß period, and input to the grid of the light-emitting diode. 22-24 H ß(60Hz) P45 Digit selection signal.
R-22GV R-22GT R-23GT R-24GT Pin No. Signal I/O Description 41-48 P17-P10 OUT Segment data signal. Signal similar to P21. 49-56 P07-P00 OUT Segment data signal. Signal similar to P21. 57-59 P37-P35 OUT Terminal not used. 60 P34 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 G4 line keys on key matrix is touched. 61 P33 OUT Key strobe signal. Signal applied to touch-key section.
R-22GV R-22GT R-23GT R-24GT 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, and sometimes it is not fully protected by the built-in protection circuit.
R-22GV R-22GT R-23GT R-24GT PROCEDURE FOR CHECKING/CLEARING SERVICE COUNTS OF MICROWAVE OVEN 3) Practice for inputting total using times (Ex. 310000 times). ... Flashing / 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. The maximum capacity of the total using is 999,999 times, and the maximum capacity of total operation time is 999,999 hours.
R-22GV R-22GT R-23GT R-24GT 5) Practice for cancelling total using times and total operation time (user and service) and all other counter. ... Flashing / PAD (Door close) SET SET (within 2.0sec.) DOUBLE QUANTITY CHECK SINGLE SET DISPLAY . . . . . . . . . KEY DISPLAY 0 0 1 1 : : 9 9 START A ... 0.1sec BUZZER INDICATOR TONE No. 2) To check the constants of Express defrost. " ": Flicker / DOUBLE PAD CHECK EXPRESS DEFROST OTHER SETTING AND CHECKING PROCEDURE 1.
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. PAD ORDER (230V power) (Door close) (Plug in) SIGNAL DOUBLE SET DISPLAY CHECK 0633 (plug off) (BLANK) TONE (BLANK) . . . . All indicators ON NOTE : 1.
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. 1. Disconnect oven from power supply. 2. Remove the screws from the rear and along side the edge of the case. 3.
R-22GV R-22GT R-23GT R-24GT and oven cavity. 4. Disconnect all wire leads from the high voltage capacitor. 5. Disconnect wire leads of high voltage rectifier assembly from the power transformers (1) and/or (2). Now, high voltage assembly is free. 7. Remove two (2) screws holding the capacitor holder to oven cavity. Now, capacitors (1), (2) are now free. BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING. 2. DO NOT REPLACE ONLY THE HIGH VOLTAGE RECTIFIER.
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 frame, ensure it is not pinched or bent. Ensure the control unit is pushed upward to lock into the control panel frame prior to screwing the control unit into the frame. 3. Ensure there are not any wires near the varistors, if the explode, they may damage the wires.
R-22GV R-22GT R-23GT R-24GT pictorial diagram. Be careful to ensure proper connection of the wire leads. 4. Make sure that the monitor switches (1), (2) and all other switches are operating properly. And check continuity of the monitor circuit. Refer to chapter "Test Procedure" and Adjustment procedure.
R-22GV R-22GT R-23GT R-24GT tight, moisture (condensation)-tight or light-tight. Therefore, occasional appearance of moisture, light or sensing of gentle warm air movement around oven door is not abnormal and do not of themselves, indicate a leakage of microwave energy from oven cavity. If such were the case, your oven could not be equipped with a vent, the very purpose of which is to exhaust the vapor-laden air from the oven cavity.
1 2 3 33 RY3(2) TAB2 TAB1 C N I A T1 RY1 4 5 7 YLW GRY BLK CN-A BLU GRN GRN NO (1) RED BLK NO E STIRRER (LOWER) O R G G R Y BLK BLK GRY GRY (1) POWER TRANSFORMER (1) G W R H Y T B L K (2) POWER TRANSFORMER (2) HIGH VOLTAGE CAPACITOR HICH VOLTAGE COMPONENTS HIGH VOLTAGE CAPACITOR Figure S-1.
1 2 3 34 G W R H Y T WHT WHT RED BLK PNK PNK INTAKE THERMISTOR RY3(2) TAB2 TAB1 C N I A T1 RY1 SP1 RY2(1) CN-H CN-B 4 5 NO RED GRN WHT WHT COM (2) GRY STIRRER (LOWER) GRY GRY PNK FUSE & FUSE HOLDER BLK A O R G B C P N K WHT R E D WHT WHT BLK BLK (1) POWER TRANSFORMER (1) HIGH VOLTAGE CAPACITOR G R Y B R N R E D Y L W (1) NC BLK GRY GRY PNK W H T W H T P N K (3) NC B L K B L K G R Y COM B R N (4) NC VOLTAGE SELECT SWITCH ES WHT PPL BLOWER TMOTOR
MICRO 2 MICRO 1 OVEN LAMP STIRRER MOTOR BLOWER MOTOR AC120V 60Hz b (J1) (J2) VRS1 CT1 RY3 RY2 c a d RY1 – – + 5 D3 (C) (B) IC2 INTAKE THERMISTOR D1 VC Q3 KRC101M – C70 C61 R33 2.7k (A) C60 0.1µ /50v (B) B3 ZD2 HZ4A2 R3 4.7k VC – H3 C62 0.1µ/50v C63 0.1µ/50v R64 4.7k MAGNETRON THERMISTOR H1 C5 47µ/10v C6 + Q60 KRA101M R5 4.
MICRO 2 MICRO 1 OVEN LAMP STIRRER MOTOR BLOWER MOTOR AC120V 60Hz TB2 TB1 COM NC COM NC A1 A7 b (J1) (J2) A5 CT1 RY3 RY2 c a RY1 – – – + D100 VC Q3 KRC101M 5 D3 (C) (B) IC2 – + C70 C61 R33 4.7k (A) C60 0.1µ /50v (B) B3 (J5) (J3) ZD2 HZ4A2 R3 4.7k VC – H3 C62 0.1µ/50v C63 0.1µ/50v R64 4.7k MAGNETRON THERMISTOR H1 C5 47µ/10v C6 + Q60 KRA101M R5 4.
MICRO 2 MICRO 1 OVEN LAMP STIRRER MOTOR BLOWER MOTOR NC A1 A7 TB2 TB1 COM NC COM AC208V 60Hz A5 VRS2 b (J1) (J2) VRS1 CT1 RY3 RY2 c a d RY1 – – + – + D100 5 D3 (C) (B) IC2 C70 C61 R33 4.7k (A) C60 0.1µ /50v (B) B3 10k (J5) (J3) ZD2 HZ4A2 R3 4.7k VC – H3 C62 0.1µ/50v C63 0.1µ/50v MAGNETRON THERMISTOR H1 C5 47µ/10v C6 + Q60 KRA101M R5 4.
MICRO 2 MICRO 1 OVEN LAMP STIRRER MOTOR BLOWER MOTOR NC A1 A7 TB2 TB1 COM NC COM AC208V 60Hz A5 b VRS1 CT1 RY3 RY2 c a d RY1 – – + – + VC Q3 KRC101M 5 D3 (C) (B) IC2 – + C70 C61 R66 4.7k R33 4.7k (A) C60 0.1µ /50v (B) B3 20k (J5) (J3) ZD2 HZ4A2 R3 4.7k VC – H3 C62 0.1µ/50v C63 0.1µ/50v MAGNETRON THERMISTOR H1 C5 47µ/10v C6 + Q60 KRA101M R5 4.
R-22GV R-22GT R-23GT R-24GT 1 2 4 3 1 5 6 13 DIP A A F 5 4 Q60 C30 R5 B + + R33 R32 R31 IC2 E C31 R83 C83 32 33 B 8 1 R30 - CF1 B C5 R82 C6 C7 1 C82 R81 C81 R3 3 ZD2 25 40 R80 C80 E B R58 Q2 3 2 1 16 CN-D IC3 15 1 20 50 C IC1 CN-G C 4 12 5 R57 R56 R55 R54 R53 R52 R51 R50 R66 6 5 (J3) (J4) 7 60 J88 9 8 10 55 R84 (J91) (J90) (J89) C64 J87 J86 R65 R62 C61 D C70 1 D23 D 10 D21 E (J9) MICRO 1 Q22 R102 B D101 C63 C3 3
R-22GV R-22GT R-23GT R-24GT PARTS LIST ◊Refer to "IMPORTANT" described at end of parts list. REF. NO. PART NO.
R-22GV R-22GT R-23GT R-24GT REF. NO. C60 C61 C62 C63-64 C70 C100 C101 CF1 D1-4 D20-22 D23 D70 D100-101 IC1 IC2 IC3 LED1 Q1 Q2 Q3 Q20 Q21 Q22-23 Q60 R1-2 R1-2 R3-5 R30 R31 R32 R33 R40 R50-58 R60 R61 R62 R63 R64 R65 R66 R70-71 R80-88 R100 R100 R101 R102 (J5) (J5) (J6) (J6) RY1 RY2-3 SP1 T1 T1 CT1 VRS1 VRS2 ZD1 ZD2 3- 2 AZ 3- 2 3- 2-1 3- 2-1 3- 2-2 3- 2-3 3- 3 3- 4 3- 5 3- 6 PART NO.
R-22GV R-22GT R-23GT R-24GT REF. NO. 4- 1 4- 2 4- 3 4- 4 4- 5 4- 6 4- 7 4- 8 4- 9 4-10 4-11 4-12 4-13 4-14 4-15 4-16 4-17 4-18 4-19 4-20 4-21 4-22 4-23 4-24 4-25 4-26 4-27 4-28 4-29 4-30 4-31 4-32 4-33 4-34 4-35 4-36 4-37 4-38 4-39 4-40 4-41 4-42 4-43 4-44 PART NO.
R-22GV R-22GT R-23GT R-24GT REF. NO. 6- 2 6- 3 6- 4 6- 4 6- 5 6- 6 6- 7 6- 7 6- 8 6- 8 6- 9 6-10 6-10 6-11 6-12 6-13 6-13 6-13 6-13 6-14 6-15 6-16 6-16 PART NO.
R-22GV R-22GT R-23GT R-24GT HOW TO ORDER REPLACEMENT PARTS 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 4indicated in the Service Policy.
R-22GV R-22GT R-23GT R-24GT 2 1 4 3 6 5 OVEN AND CABINET PARTS 7-29 4-20 6-8 A 6-11 7-18 2-5 2-6 A 4-43 2-5-1 7-25 7-18 2-4 7-31 6-12 2-8 7-33 4-30 B 7-18 7-33 7-18 4-42 4-26 7-22 2-7 7-1 7-12 1-15 7-1 C 7-8 7-24 7-18 C 7-3 7-28 6-6 7-14 6-9 7-13 1-10 4-21 4-29 4-28 1-13 6-5 A2 4-1 1-1 4-27 4-12 7-16 7-32 x-2 4-33 4-13 7-4 7-15 4-18 4-41 7-19 4-25 1-14 4-2 1-6 7-26 4-27 1-7 1-18 1-2 D B 7-20 7-22 4-26 A1 7-17 7-34 7-18 7-17 7-11 A2 A
R-22GV R-22GT R-23GT R-24GT PACKING TOP PAD ASSEMBLY FPADBA313WRK0 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.
