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Sharp R-2277 Service Manual

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CAUTION, MICROWAVE RADIATION ....................................................................................................... 1
WARNING .................................................................................................................................................... 1
PRODUCT SPECIFICATIONS ................................................................................................................... 2
GENERAL IMPORTANT INFORMATION ...................................................................................................2
APPEARANCE VIEW ................................................................................................................................. 3
OPERATION SEQUENCE .......................................................................................................................... 4
FUNCTION OF IMPORTANT COMPONENTS .......................................................................................... 5
SERVICING ................................................................................................................................................ 7
TEST PROCEDURE ................................................................................................................................. 10
CONTROL PANEL ASSEMBLY ................................................................................................................ 18
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ..................................................... 23
MICROWAVE MEASUREMENT .............................................................................................................. 28
TEST DATA AT A GLANCE ..................................................................................................................... 29
WIRING DIAGRAM ................................................................................................................................... 30
PICTORIAL DIAGRAM ............................................................................................................................. 31
CONTROL PANEL CIRCUIT ..................................................................................................................... 32
PRINTED WIRING BOARD ....................................................................................................................... 34
PARTS LIST ............................................................................................................................................. 35
SERVICE MANUAL
MODEL
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-2277
R-2287
R-2277
R-2287
S5504R2277H//
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  • Page 1: Table Of Contents

    R-2277 R-2287 SERVICE MANUAL S5504R2277H// COMMERCIAL MICROWAVE OVEN R-2277 MODEL R-2287 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 Page CAUTION, MICROWAVE RADIATION ....................... 1 WARNING ..............................

  • Page 2: Caution Microwave Radiation

    R-2277 R-2287 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

    MICROWAVE OVEN R-2277 / R-2287 GENERAL IMPORTANT INFORMATION APPEARANCE VIEW This Manual has been prepared to provide Sharp Corp. Service engineers with Operation and Service Information. It is recommended that service engineers carefully study the entire OPERATING SEQUENCE text of this manual, so they will be qualified to render satisfactory customer service.
  • Page 4 Single phase, 3 wire grounded Power Consumption 2.7 kW Approx. 13A (R-2287) / 2.0kW 9A for R-2277 Power Output 1700 watts (R-2287) /1200 watts (R-2277) nominal of RF microwave energy (Method of IEC 705) Operating frequency of 2450MHz Outside Dimensions...

  • Page 5: Appearance View

    R-2277 R-2287 APPEARANCE VIEW OVEN 1. Control panel 2. Door lock openings 3. Tray 4. Splash cover 5. Oven lamp 6. Air intake filter 7. Air intake openings 8. Oven cavity 9. Door seals and sealing surfaces 10. Door hinges 11.

  • Page 6: Operation Sequence

    R-2277 R-2287 OPERATION SEQUENCE OFF CONDITION The circuits to the high voltage transformers T1+T2 are Closing the door activates all door interlock switches cut off when the 1st latch, 2nd latch, 3rd latch and stop (1st latch switch, 2nd latch switch, 3rd latch switch and stop switches SW1+SW2+SW3+SW5 are made open.

  • Page 7: Function Of Important Components

    SWITCH SW5 1. When the oven door is closed, the contacts COM-NO WEAK POINT (R-2287)/ FUSE (R-2277) F1 must be closed. If the wire harness or electrical components make a short- 2.
  • Page 8 R-2277 R-2287 FUSE F6.3A 250V F2 MAGNETRON THERMISTOR 1. If the wire harness or electrical components are short- The air temperature around the lower magnetron is circuited, this fuse blows to prevent an electric shock detected through the resistance of the thermistor.

  • Page 9: Servicing

    3D checks and re-examine the insulated screwdriver. connections to the component being tested. Sharp recommend that wherever possible fault-finding is carried out with the supply disconnected. It may in, some cases, be necessary to connect the supply after...

  • Page 10: Test Procedure

    R-2277 R-2287 TEST PROCEDURE POSSIBLE CAUSE DEFECTIVE PARTS PPROBLEM CONDITION “ . “ does not appear on display when power cord is plugged into wall outlet. Control panel can not accept key in. Fuse F2 F6.3A blows when the door is opened.
  • Page 11 R-2277 R-2287...
  • Page 12 Water load ... 1000 g Initial temperature10±2°C Heating time (R-2287) ..25 sec. P=170x∆T ((R-2287) Heating time (R-2277) ..35 sec. P=120x∆T (R-2277) 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 13 The equation is “P = 170 x ∆T” for R-2287 ......P = 170 x 10°C = 1700 Watts The equation is “P = 120 x ∆T” for R-2277 ......P = 120 x 10°C = 1200 Watts JUDGMENT: The measured output power should be at least ± 15 % of the rated output power.
  • Page 14 R-2277 R-2287 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER The normal resistance is infinity in one direction and more than 100 kΩ in the other direction. CARRY OUT 4R CHECKS. ASYMMETRIC ASYMMETRIC RECTIFIER TEST RECTIFIER HIGH VOLTAGE RECTIFIER CARRY OUT 3D CHECKS.
  • Page 15 CARRY OUT 4R CHECKS. CAUTION: Only replace weak point/ fuse with the correct value replacement. Type A018 is for R-2287. Type M6.3A is for R-2277. WEAK POINT A017/ FUSE 13A (F1) TEST CARRY OUT 3D CHECKS.
  • Page 16 R-2277 R-2287 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER MONITOR RESISTOR TEST CARRY OUT 3D CHECKS. Disconnect the leads from the monitor resistor. Using an ohmmeter and set on a low range. Check between the terminals of the monitor resistor. The resistance of monitor resistor should be read approx. 4.3Ω.
  • Page 17 R-2277 R-2287 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Resistance of Blower motor should be approximately 52Ω. Resistance of Stirrer motor should be approximately 8.8 kΩ. If incorrect readings are obtained, replace the motor. CARRY OUT 4R CHECKS. NOISE FILTER TEST CARRY OUT 3D CHECKS.
  • Page 18 R-2277 R-2287 TEST PROCEDURES (CONT'D) PROCEDURE COMPONENT TEST LETTER SWITCH UNIT TEST 1. CARRY OUT 3D CHECKS. 2. Remove the switch unit from the control panel, referring to control panel removal. 3. To test the switches (SW1-SW5) on the switch unit, check between the terminals of the connector CN-F as described in the following table by using ohmmeter when the switches are released and depressed.
  • Page 19 R-2277 R-2287 NOTE: *At the time of these repairs, make a visual inspection of the varistor for burning damage and examine the transformer with tester for the presence of layer short-circuit (check primary coil resistance). If any (J9) abnormal condition is detected, replace the defective parts.

  • Page 20: Control Panel Assembly

    R-2277 R-2287 CONTROL PANEL ASSEMBLY OUTLINE OF CONTROL PANEL The control section consists of the following units as thermistor (Exhaust Air Temperature Sensor) to IC1. shown in the touch control panel circuit. High Voltage Monitoring Circuit. (1) Control Unit This circuit detects problems in the magnetron / high...
  • Page 21 R-2277 R-2287 DESCRIPTION OF LSI 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. Vp voltage of power source circuit input.
  • Page 22 R-2277 R-2287 Pin No. Signal Description INT0 Signal synchronized with commercial power source freqency. 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.
  • Page 23 R-2277 R-2287 Pin No. Signal Description Signal similar to P21. 57-64 P37-P30 Terminal not used.
  • Page 24 R-2277 R-2287 SERVICING 1. Precautions for Handling Electronic Components and repair all the controls (sensor-related ones in- This unit uses CMOS LSI in the integral part of the cluded) of the touch control panel while keeping it circuits. When handling these parts, the following connected to the oven.

  • Page 25: Component Replacement And Adjustment Procedure

    R-2277 R-2287 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below before operating the oven. 1. CARRY OUT 3D CHECKS. 1. Door does not close firmly. 2. Make sure that a definite” click” can be heard when the 2.
  • Page 26 3. Where the portions have been snipped off bend the 7. After replacement use the one (1) screw to fit the stirrer portions flat. No sharp edge must be evident after motor cover. (This screw has been fitted to the base removal of the stirrer cover.
  • Page 27 R-2277 R-2287 CONTROL PANEL ASSEMBLY AND CONTROL UNIT REMOVAL CONTROL PANEL ASSEMBLY REMOVAL Replacement of individual component is as follows: The complete control panel should be removed for re- CONTROL UNIT AND CONTROL PANEL FRAME placement of components. To remove the control panel,...
  • Page 28 R-2277 R-2287 POWER SUPPLY CORD REPLACEMENT CARRY OUT 3D CHECKS. Re-install the cord bushing to the rear cabinet. Release the cord bushing from the rear cabinet. Re-install the rear cabinet to oven cavity and the Disconnect the brown and blue wires of the power bottom plate with the eleven (11) screws and two (2) supply cord from the noise filter.
  • Page 29 R-2277 R-2287 DOOR REPLACEMENT AND ADJUSTMENT DOOR REPLACEMENT 2. Lift up the choke cover, now cove is free. 1. CARRY OUT 3D CHECKS. 2. Remove four (4) screws holding the upper and lower oven hinge to the oven cavity. 3. Remove door assembly with upper and lower oven...

  • Page 30: Microwave Measurement

    R-2277 R-2287 SERVICE INFORMATION IMPORTANT: When replace the magnetron MG1 and/or MG2, the relays RY3 and RY4 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 31: Test Data At A Glance

    0.94µF AC 2100V High voltage transformer (R-2287) T1, T2 Filament winding < 1Ω Secondary winding Approx. 57Ω Primary winding Approx. 1Ω High voltage transformer (R-2277) T1, T2 Filament winding < 1Ω Secondary winding Approx. 83Ω Primary winding Approx. 2Ω Magnetron Filament winding <...
  • Page 32 R-2277 R-2287 SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED APPEARS ON DISPLAY NOTE: " " INDICATES COMPONENTS WITH POTENTIALS ABOVE 250V. TC2: MAGNETRON WP2:WEAK POINT A018 THERMAL CUT OUT SW2: 2ND LATCH SWITCH 145C°(LOWER) C1: H.V. CAPACITOR WP1: WEAK POINT...
  • Page 33 R-2277 R-2287...
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  • Page 36: Printed Wiring Board

    R-2277 R-2287 Figure S-3. Printed Wiring Board...

  • Page 37: Parts List

    3rd. latch switch QSW-MA086WRE0 Monitor switch QSW-MA085WRE0 Stop switch C1, C2 RC-QZA165WRE0 High voltage capacitor [R-2287] C1, C2 RC-QZA169WRE0 High voltage capacitor [R-2277] RLMPTA028WRE0 Oven lamp RMOTDA205WRE0 Stirrer motor Monitor resistor 4.3 Ω 20W RR-WZA020WRE0 RTHM-A037WRE0 Magnetron thermal cut-out 145˚C RTHM-A057WRE0 Magnetron thermal cut-out 145˚C...
  • Page 38 Resistor 15 ohm 1/2W VRD-B12EF153J Resistor 15k ohm 1/4W VRD-B12EF471J Resistor 470 ohm 1/4W R30-31 VRN-B12EK202F Resistor 2k ohm 1/4W [R-2277] R30-31 VRN-B12EK152F Resistor 1.5k ohm 1/4W [R-2287] R32-33 VRD-B12EF102J Resistor 1.0k ohm 1/4W R34-35 VRD-B12EF304J Resistor 300k ohm 1/4W...
  • Page 39 R-2277 R-2287 ∆ Note: The parts marked " " may cause undue microwave exposure. The parts marked "*" are used in voltage more than 250V. REF. NO. PART NO. DESCRIPTION Q'TY CODE 3- 13-2 FW-VZA166DRE0 Lead wire harness (5-pin) 3- 13-3...
  • Page 40 R-2277 R-2287 ∆ Note: The parts marked " " may cause undue microwave exposure. The parts marked "*" are used in voltage more than 250V. REF. NO. PART NO. DESCRIPTION Q'TY CODE 5-11 XCPSD40P12000 Screw : 4mm x 12mm 5-12...
  • Page 41 R-2277 R-2287 ∆ Note: The parts marked " " may cause undue microwave exposure. The parts marked "*" are used in voltage more than 250V. REF. NO. PART NO. DESCRIPTION Q'TY CODE 7-36 XJPSD40P10000 Screw : 4mm x 10mm 7-37...
  • Page 42 R-2277 R-2287 OVEN AND CABINET PARTS 2-5-2 6-11 7-31 2-5-1 7-29 4-20 6-12 7-18 6-10 6-13 4-43 4-44 7-23 7-14 7-18 7-37 7-18 7-33 7-18 4-26 4-39 7-18 7-12 7-11 4-27 7-14 7-19 4-45 7-24 4-13 4-25 7-39 4-18 4-27...
  • Page 43 R-2277 R-2287 CONTROL PANEL PARTS 3-13 3-20 3-2-3 3-10 3-2-1 3-21 3-2-2 3-17 3-19 3-18 3-22 3-16 3-14 3-11 3-15 3-12 DOOR PARTS 5-10 5-14 5-11 5-12 5-15 5-18 5-20 5-16 5-13 5-17 5-13 5-19...
  • Page 44 * CPADBA203WRK0 DOOR PROTECTION SHEET * SPADP0336WRE0 WRAP COVER DOOR PAD * SPADF0341WRE0 TRAY HOLDER * SPADPA505WRE0 PACKING CASE * SPAKCC551WRE0 SPAKCC553WRE0 (R-2287) SPAKCC554WRE0 (R-2277) * Not replaceable items. PRINTING MATER INSTRUCTION BOOK '95 SHARP CORP. (5S1.30E) Printed in Germany...

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R-2287

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