Sharp R-22AM Service Manual
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Sharp R-22AM Service Manual

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18 00 W/ R- 23
AT
R-23AT
CAUTION, MICROWAVE RADIATION ....................................................................... INSIDE FRONT COVER
WARNING .......................................................................................................................................................... 1
SERVICING ...................................................................................................................................................... 2
PRODUCT SPECIFICATIONS ......................................................................................................................... 5
GENERAL INFORMATION ................................................................................................................................ 5
APPEARANCE VIEW ....................................................................................................................................... 6
OPERATION SEQUENCE ................................................................................................................................ 7
FUNCTION OF IMPORTANT COMPONENTS ................................................................................................ 9
TROUBLESHOOTING GUIDE ........................................................................................................................ 10
TEST PROCEDURE ........................................................................................................................................ 12
TOUCH CONTROL PANEL ASSEMBLY ........................................................................................................ 20
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ........................................................... 31
MICROWAVE MEASUREMENT .................................................................................................................... 38
TEST DATA AT A GLANCE ........................................................................................................................... 39
WIRING DIAGRAM ......................................................................................................................................... 39
PICTORIAL DIAGRAM ................................................................................................................................... 41
CONTROL PANEL CIRCUIT ........................................................................................................................... 42
PRINTED WIRING BOARD ............................................................................................................................. 45
PARTS LIST ................................................................................................................................................... 46
SERVICE MANUAL
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In interests of user-safety the oven should be restored to its
original condition and only parts identical to those specified
should be used.

TABLE OF CONTENTS

SHARP CORPORATION
COMMERCIAL
MICROWAVE OVEN
R-22AM
R-23AM
R-23AT
R-22AM
R-23AM
R - 2 3 A T
SY911R23ATH/
Page

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  • Page 1: Table Of Contents

    R-22AM R-23AM R - 2 3 A T SERVICE MANUAL SY911R23ATH/ COMMERCIAL MICROWAVE OVEN R-22AM MODELS R-23AM 18 00 W/ R- 23 R-23AT R-23AT In interests of user-safety the oven should be restored to its original condition and only parts identical to those specified should be used.

  • Page 2: Caution Microwave Radiation

    R-22AM R-23AM R - 2 3 A T CAUTION MICROWAVE RADIATION Personnel should not be exposed to the microwave energy which may radiate from the magnetron or other microwave generating devices if it is improperly used or connected. All input and output microwave connections, waveguides, flanges and gaskets must be secured.

  • Page 3: Warning

    COMMERCIAL MICROWAVE OVEN R-22AM/ R-23AM/ R-23AT GENERAL INFORMATION GENERAL IMPORTANT INFORMATION This Manual has been prepared to provide Sharp Corp. Service engineers with Operation and Service Information. APPEARANCE VIEW It is recommended that service engineers carefully study the entire text of this manual, so they will be qualified to render satisfactory customer service.

  • Page 4: Servicing

    Indien het water nog steeds schroevedraaier kortsluit tegen het chassis. koud is, herhaalt u de allereerste drie stappen en controleer Sharp beveelt ten sterkste aan dat, voor zover mogelijk, nogmaals de aansluitingen naar de geteste onderdelen. defecten worden opgespoord wanneer de stekker uit het Wanneer alle reparaties zijn uitgevoerd en de oven weer in stopcontact is gehaald.
  • Page 5 är kallt utför Du 3 steg kontroller och kontrollerar anslutningarna till varje enskild komponent på nytt. Sharp rekommenderar att felsökning sker med strömmen fränkopplad. Ibland kan det var nödvändigt att koppla på När all service är klar och ugnen ihopskruvad skall ugnens strömmen efter det att höljet avlägsnats, utför da 3 Steg...
  • Page 6 Sharp raccomanda, nei limiti del possibile, che la ricerca dei guasti avvenga in assenza di alimentazione elettrica. In alcuni casi tuttavia, può essere necessario alimentare Dopo aver portato a termine le operazioni di manutenzione l'apparecchio dopo aver rimosso la scatola esterna.

  • Page 7: Product Specifications

    50 Hertz Single phase, 3 wire earthed Power Comsumption 2.4 kW Approx. 11 A [R-22AM] / 2.9 kW Approx. 13 A [R-23AM, R-23AT] Power Output 1500 W [R-22AM]/ 1800 W [R-23AM/23AT] nominal of RF microwave energy (measured by method of IEC 60705) Operating frequency 2450 MHz...

  • Page 8: Appearance View

    17. Power supply cord 18 Mounting plate 19 Screw for mounting plate POWER DEF CHECK POWER NUMBER DISPLAY AND INDI- DISPLAY AND INDICATORS CATORS for R-22AM, 1 2 3 DOUBLE FILTER /100% for R-23AT R-23AM Check indicators after the oven...

  • Page 9: Operation Sequence

    High voltage transformer T2 NC) of the monitor switch SW4 must be opened first. After that the contacts (COM-NO) of the 1st, 2nd, 3rd for R-22AM/23AM latch and stop switches SW1+SW2+SW3+SW5 must Enter a desired cooking time with the turning ELEC- be closed.
  • Page 10 3 seconds are needed for heat- COMMERCIAL ing up the magnetron filament. FREQUENCY (50HZ) MICROWAVE VARIABLE COOKING (for R-22AM and R-23AM) POWER OUTPUT BY MAGNETRON T1 When the microwave oven is preset for variable cooking power, the line voltage is supplied to the high voltage...

  • Page 11: Function Of Important Components

    R-22AM R-23AM R - 2 3 A T FUNCTION OF IMPORTANT COMPONENTS DOOR OPEN MECHANISM CAUTION:BEFORE REPLACING A BLOWN FUSE F2 F6.3A TEST THE 1ST LATCH SWITCH SW1, 1. The door release lever is pulled. MONITOR SWITCH SW4 AND MONITOR 2.

  • Page 12: Troubleshooting Guide

    R-22AM R-23AM R - 2 3 A T cavity, the oven temperature fuse will open at 120˚C, MAGNETRON THERMISTOR causing the oven to shut down. The defective temperature The thermistor is a negative temperature coefficient type. fuse must be replaced with new rated one.
  • Page 13 R-22AM R-23AM R - 2 3 A T...

  • Page 14: Test Procedure

    Initial temperature (T1) ...... 10±1°C Heating time28 sec. [R-22AM] / 23sec. [R-23AM/23AT] Mass of container (mc) ..330 g P = 150 x ∆T [R-22AM] / P = 180 x ∆T [R-23AM, R-23AT] T2 ....Final temperature Measuring condition: 1. Container The water container must be a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an outside diameter of approximately 190 mm.
  • Page 15 Measured output power The equation is “P = 150 x ∆T” [for R-22AM] ......P = 150 x 10°C = 1500 Watts The equation is “P = 180 x ∆T” [for R-23AM/23AT] ....P = 180 x 10°C = 1800 Watts ±...
  • Page 16 R-22AM R-23AM R - 2 3 A T TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST HIGH VOLTAGE CAPACITOR TEST CARRY OUT 3D CHECKS. A. Isolate the high voltage capacitor from the circuit. B. Continuity check must be carried out with measuring instrument which is set to the highest resistance range.
  • Page 17 R-22AM R-23AM R - 2 3 A T TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST TEMPERATURE FUSE TEST 1. CARRY OUT 3D CHECKS. 2. A continuity check across the temperature fuse terminals should indicate a closed circuit unless the temperature of the temperature fuse reaches specfied temperature as shown below.
  • Page 18 R-22AM R-23AM R - 2 3 A T TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST Room Temp. 59˚F (15˚C) 68˚F (20˚C) 77˚F (25˚C) Resistance Approx. 16 kΩ Approx. 13 kΩ Approx. 11 kΩ If the meter does not indicate above resistance, replace the thermistor.
  • Page 19 Buzzer does not sound or continues to sound. b) Cooking is not possible. CONTROL PANEL ASSEMBLY TEST FOR R-23AM / R-22AM The control panel consists of circuits including semiconductors such as LSI etc. Therefore, unlike conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter and ohmmeter.
  • Page 20 High voltage transformer 1 APPROX. 18.0V D.C. High voltage transformer 2 RY1, RY2 and RY3 Relay Test For R-23AM / R-22AM These relays are operated by D.C. voltage. Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation.
  • Page 21 Check and repair. Only pattern at "a" is broken. *Insert jumper wire J24 and solder for R-23AT. *Insert jumper wire J9 and solder for R-23AM / R-22AM. (CARRY OUT 3D CHECKS BEFORE REPAIR) Pattern at "a" and "b" are broken.

  • Page 22: Touch Control Panel Assembly

    R-22AM R-23AM R - 2 3 A T TOUCH CONTROL PANEL ASSEMBLY FOR R-23AT OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following units as AC voltage which is determined by R61/R62. shown in the touch control panel circuit.
  • Page 23 AN4 PORT constant voltage circuit, etc.. 2) ACL Circuit Figure T-1. High Voltage Monitoring Circuit For R-23AM / R-22AM This is an Auto-clear Circuit, i.e., a reset circuit, which enables IC1 to be activated from initial state. 13) Magnetron Temperature Detecting Circuit.
  • Page 24 R-22AM R-23AM R - 2 3 A T DESCRIPTION OF LSI FOR R-23AT LSI(IZA646DR) The I/O signal of the LSI(IZA646DR) is detailed in the following table. Pin No. Signal Description VREF Reference voltage input terminal. A reference voltage applied to the A/D converter in the LSI. Connected to GND.(0V) Temperature measurement input: MAGNETRON THERMISTOR AND OVEN THERMISTOR (2).
  • Page 25 R-22AM R-23AM R - 2 3 A T Pin No. Signal Description Signal synchronized with commercial power source frequency. H : GND This is basic timing for all time processing of LSI. L (-5V) 20 msec Terminal not used. CNVSS Connected to Vc.(-5V)
  • Page 26 R-22AM R-23AM R - 2 3 A T Pin No. Signal Description 42-43 P14-P13 Segment data signal. Signal similar to P17. Segment data signal. Signal similar to P17. Key strobe signal. Signal applied to touch-key section. A pulse signal is input to R0 - R3 terminal while one of G-8 line keys on key matrix is touched.
  • Page 27 R-22AM R-23AM R - 2 3 A T DESCRIPTION OF LSI FOR R-23AM / R-22AM LSI(IZA648DR) The I/O signal of the LSI(IZA648DR) is detailed in the following table. Pin No. Signal Description Connected to GND. Anode (segment) of Fluorescent Display light-up voltage: -35V.
  • Page 28 R-22AM R-23AM R - 2 3 A T Pin No. Signal Description INT0 Signal synchronized with commercial power source frequency. This is basic timing for all time processing of LSI. 32 sec. RESET Auto clear terminal. Signal is input to reset the LSI to the initial state when power is supplied. Temporarily set to "L"...
  • Page 29 R-22AM R-23AM R - 2 3 A T Pin No. Signal Description 55-56 P01-P00 Segment data signal. Signal similar to P21. 57-64 P37-P30 Terminal not used. 2-2 Memory IC (IC2) FOR R-23AT AT24C04 is a 4K-bit, serial memory, enabling CMOS to be erased/written electrically. This memory is constructed with 512 registers x 8bits, enabling individual access, read and write operations to be performed.
  • Page 30 R-22AM R-23AM R - 2 3 A T SERVICING 1. Precautions for Handling Electronic Components both ends of the door sensing switch (on PWB) of the This unit uses CMOS LSI in the integral part of the touch control panel with a jumper, which brings about circuits.
  • Page 31 R-22AM R-23AM R - 2 3 A T PROCEDURE FOR ENTERING TO IC-2 FOR R-23AT PROCEDURE FOR CHECKING/CLEARING SERV- ICE COUNTS OF MICROWAVE OVEN FOR R-23AT When the control unit or IC-2 is exchanged, re-enter the constants of DEFROST, the memory information and the The following procedure enables the servicer to obtain the EEPROM data, referring to the following procedures.
  • Page 32 R-22AM R-23AM R - 2 3 A T 2) How to enter the memory information Table of EEPROM data Example : Suppose cooking time 5 sec. and output power Memory Data Contents 100% are entered into the memory pad 1.

  • Page 33: Component Replacement And Adjustment Procedure

    WARNING FOR WIRING To prevent an electric shock, take the following and Oven cavity. precautions. 3) Sharp edge: 1. Before wiring, Bottom plate, Oven cavity, Waveguide flange, 1) Disconnect the power supply cord. Chassis support and other metallic plate.
  • Page 34 R-22AM R-23AM R - 2 3 A T 4. Remove the wire lead(s) of high voltage transformer(s) 8. Disconnect the main wire harness from high voltage from the wire holder. transformer(s). 5. Pull out the wire lead(s) of high voltage transformer(s) 9.
  • Page 35 1. CARRY OUT 3D CHECKS. 3. Where the portions have been snipped off bend the 2. Disconnect the wire leads from the stirrer motor (up- portions flat. No sharp edge must be evident after per). removal of the stirrer motor cover.
  • Page 36 COVER THE TIP OF SCREWDRIVER WITH TAPE. varistor works, because it will explode and the (3) If the relay (RY-4 for R-23AT ; RY-3 for R-22AM/23AM) wire leads near by the varistor will be damaged. is hit, re-solder the Relay (RY-4) prior to reinstalling the Touch Control Panel.
  • Page 37 R-22AM R-23AM R - 2 3 A T for R-23AT 2. When inserting key cable to main body set, CONTROL UNIT AND CONTROL PANEL FRAME ensure them free from caught-in trouble. In addition, when installing the control panel as- (WITH KEY) sembly to base plate with screws, be sure of 7.
  • Page 38 R-22AM R-23AM R - 2 3 A T 1. Loosen the two (2) screws holding the latch hook. 3. Re-install outer case and check for microwave leakage 2. With the door closed, adjust the latch hook by moving around the door with an approved microwave survey it back and forward, or up and down.
  • Page 39 IMPORTANT: When the magnetron MG1 and/or MG2 is replacing, the relays (RY3 and RY4 for R-23AT; RY2 and RY3 for R-22AM/23AM) on control unit must be replaced at the same time. Because if the magnetron's life has been over, the relay's life may also be over.

  • Page 40: Microwave Measurement

    R-22AM R-23AM R - 2 3 A T MICROWAVE MEASUREMENT Recommended instruments are: After adjustment of door latch switches, monitor switch NARDA 8100 and door are completed individually or collectively, the NARDA 8200 following leakage test must be performed with a survey...

  • Page 41: Test Data At A Glance

    TEMP. FUSE 150 °C TF2: C1: H.V. CAPACITOR 0.94 µF/ AC2300V MAGNETRON (MG2) TEMP. FUSE 150°C F3: FUSE M8A H.V.FUSE 0.6 A/ 5 kV (R-22AM) 0.75 A/ 5 kV R-23AT R-23AM CONTROL UNIT C2: H.V. CAPACITOR 0.94 µF/ AC2300V SW5:...
  • Page 42 TEMP. FUSE 150 °C C1: H.V. CAPACITOR TF2: 0.94 µF/ AC2300V MAGNETRON (MG2) TEMP. FUSE 150°C F3: FUSE M8A H.V.FUSE 0.6 A/ 5 kV (R-22AM) 0.75 A/ 5 kV R-23AT R-23AM CONTROL UNIT C2: H.V. CAPACITOR 0.94 µF/ AC2300V SW5:...

  • Page 43: Pictorial Diagram

    R-22AM R-23AM R - 2 3 A T...

  • Page 44: Control Panel Circuit

    R-22AM R-23AM R - 2 3 A T...
  • Page 45 R-22AM R-23AM R - 2 3 A T...
  • Page 46 R-22AM R-23AM R - 2 3 A T...

  • Page 47: Printed Wiring Board

    R-22AM R-23AM R - 2 3 A T (C74) R101 (J1) R300 R100 (D92) (R92) (D91) (R91) (Q201) (R200) (R201) (R62) (Q200) (Q60) (Q50) (J3) (J10) (D200) (D74 (R61,J13) ,R50) (R76) (R77 ,J31) (D50) (D60, R65) (R60) (R86) DOOR (Q24)

  • Page 48: Parts List

    QSW-MA086WRE0 Monitor switch QSW-MA085WRE0 Stop switch T1, T2 RTRN-A599WRE0 High voltage transformer [R-23AM/R-23AT] T1, T2 RTRN-A600WRE0 High voltage transformer [R-22AM] TF1, TF2 QFS-TA014WRE0 Temperature fuse 150˚C (MG.) TF3, TF4 QFS-TA015WRE0 Temperature fuse 120˚C (OVEN, BM.) 1- 1 FH-HZA064WRE0 Oven thermistor (2)
  • Page 49 Door lever cushion 5-22 PSPA-A102WRE0 Door case spacer MISCELLANEOUS 6- 1 TINSMA014WRR0 Operation manual [R-23AT] 6- 1 TINSMA016WRR0 Operation manual [R-22AM, R-23AM] 6- 2 TLABHA029WRR0 Menu sticker [R-23AT] 6- 3 FW-VZB769WRE0 Switch harness 6- 4 FW-VZB765WRE0 Main wire harness 6- 5...
  • Page 50 4. DESCRIPTION PACKING AND ACCESSORIES TOP PAD ASSEMBLY FPADBA313WRK0 DOOR PROTECTION SHEET SPADPA552WRE0 WRAP COVER BOTTOM PAD ASSEMBLY FPADBA314WRK0 DOOR PAD SPADF0341WRE0 TRAY SUPPORT SPADPA551WRE0 6-1 INSTRUCTION MANUAL PACKING CASE SPAKCD318WRE0 [R-23AT] SPAKCD323WRE0 [R-23AM] SPAKCD324WRE0 [R-22AM] * Not replaceable items.
  • Page 51 R-22AM R-23AM R - 2 3 A T OVEN AND CABINET PARTS 7-26 7-29 4-20 6-10 7-18 6-11 4-23 2-5-1 7-25 4-33 7-16 7-31 7-18 2-5-2 7-26 4-43 4-30 7-18 7-22 7-33 7-13 7-32 7-22 7-16 7-22 4-39 4-26 7-18...
  • Page 52 R-22AM R-23AM R - 2 3 A T DOOR PARTS 5-22 5-10 5-11 5-14 5-20 5-12 5-15 5-18 5-13 5-16 5-11 5-17 5-13 5-21 5-19 MISCELLANEOUS Actual wire harness may be different from illustration. 6-14 6-16...
  • Page 53 R-22AM R-23AM R - 2 3 A T CONTROL PANEL PARTS FOR R-23AT REF. NO. PART NO. DESCRIPTION Q'TY CODE 3- 1 DPWBFC001WRU0 Control unit 3- 1A QCNCMA308DRE0 4-pin connector (A) 3- 1B QCNCMA312DRE0 3-pin connector (B) 3- 1C QCNCWA030DRE0...
  • Page 54 3- 5 XEPSD40P12000 Screw; 4mm x 12mm 3- 6 XHTSD40P08RV0 Screw; 4mm x 8mm 3- 7 XCTSD40P08000 Screw; 4mm x 8mm CONTROL PANEL PARTS FOR R-23AM / R-22AM REF. NO. PART NO. DESCRIPTION Q'TY CODE 3- 1 DPWBFC007WRU0 Control unit [R-23AM]...
  • Page 55 VRD-B12EF512J Resistor 5.1k ohm 1/4W VRD-B12EF473J Resistor 47k ohm 1/4W VRD-B12EF182J Resistor 1.8k ohm 1/4W [R-23AM] VRD-B12EF242J Resistor 2.4k ohm 1/4W [R-22AM] VRD-B12EF332J Resistor 3.3k ohm 1/4W R80-81 VRD-B12EF224J Resistor 220k ohm 1/4W R82-83 VRD-B12EF472J Resistor 4.7k ohm 1/4W R84-85...
  • Page 56 3 - 1 6 - 9 3-2-4 3 - 5 3-2-2 3 - 7 3 - 4 3 - 6 3 - 3 3-2-1 CONTROL PANEL PARTS R-22AM, R-23AM 3-2-4 3-12 3-19 3-2-3 3-2-1 3-20 3-2-2 3-18 3-16 3-17 3-23...

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