Sharp R-4A10 Service Manual
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Sharp R-4A10 Service Manual

Sharp R-4A10 Service Manual

Microwave oven
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R4AlO
RQAZO
R4A30
SHARP
SERVICE MANUAL
S8804R4AlOJ//
v.
-r-
MICROWAVE
OVEN
MODELS
R-4Alo
R-4A20
-
R-4A30
Photo R-4AlO
In the interests of user-safety the set should be restored to its original
condition
and only parts identical to those specified should be used.
(RDlGlOlU)
TABLE
OF CONTENTS
Page
FOREWORD
.......................................................................................................................................................
1
CAUTION,
MICROWAVE
RADIATION
..........................................................................................................
1
PRODUCT
DESCRIPTION
...............................................................................................................................
2
OPERATION
.......................................................................................................................................................
4
SERVICING
........................................................................................................................................................
TOUCH CONTROL
PANEL ASSEMBLY
.....................................................................................................
1:
COMPONENT
REPLACEMENT
AND ADJUSTMENT
PROCEDURE
......................................................
20
MICROWAVE
MEASUREMENT
PROCEDURE
..........................................................................................
24
PICTORIAL
DIAGRAM
..................................................................................................................................
25
CONTROL
PANEL CIRCUIT
.........................................................................................................................
26
PRINTED WIRING
BOARD
..........................................................................................................................
27
PARTS LIST ....................................................................................................................................................
28
PACKING AND ACCESSORIES
...................................................................................................................
34
SHARPCORPORATlON

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Summary of Contents for Sharp R-4A10

  • Page 1: Table Of Contents

    R4AlO RQAZO R4A30 SHARP SERVICE MANUAL S8804R4AlOJ// MICROWAVE OVEN R-4Alo MODELS R-4A20 R-4A30 In the interests of user-safety the set should be restored to its original Photo R-4AlO condition and only parts identical to those specified should be used. (RDlGlOlU)

  • Page 2: Photo R-4Alo

    R4AlO R4A20 R4A30 3 _ _ -___c . c. =--k-Pug *: 3 _, .:ss .- ---...--w.z-~_ -.‘.~ .-.-. ~ --.--be-_ Photo R-4A20 Photo RQA30...

  • Page 3: Foreword

    SERVICE MANUAL SHARP MICROWAVE OVEN FOREWORD 1 OPERATION This Manual has been prepared to provide Sharp Corp. Service Personnel with complete Operation and Service information for the SHARP MICROWAVE ovens, R4A10/R4AZ0/R4A30. It is recommended that service personnel carefully study the...

  • Page 4: Product Description

    DESCRIPTION EXPLANATION OF MICROWAVE COOKING moisture content, like most foods, will absorb micro- The Sharp Microwave Oven uses microwave energy to wave energy. As the microwave energy at a frequency produce heat in the food to be cooked. Unlike con-...
  • Page 5 R-4A20 R4A30 7. Door latches 1. Ventilation openings 8. Door open button 2. Oven lamp 9. Touch Control Panel 3. Oven door with see through window 10. Digital readout 4. Removable turntable 11. Waveguide cover 5. Roller Stay 12. Access cover for oven lamp replacement 6.

  • Page 6: Operation

    R4AlO OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions 6. When the door is opened during a cook cycle, during oven operation. monitor switch, upper latch switch and lower latch (RD71101 switch are activated with the following results.
  • Page 7 240V-50Hz 240V--5OHz Fuss MS.3A CONTROL k&i~ UNIT ‘a2 SWITCH TURNTABLE MOTOR SCHEMATIC SCHEMATIC NOTE: CONDITION OF OVEf NOTE CONDITION OF OVEN 1 DOOR CLOSED 1 DOOR CLOSED 2 COOKING TIME 2 CLOCK APPEARS Jr--+ PROGRAMMED ON DISPLAY T -e.- 3 VARIABLE COOKING I a-- l-L=&...
  • Page 8 EZ:: R.4A30 DESCRIPTION FUNCTION OF COMPONENTS UPPER LATCH SWITCH OVEN LAMP The switch is activated by the upper latch head on the The oven lamp illuminates the interior of the oven so door while the door is closed. that food being cooked can be examined...

  • Page 9: Servicing

    MIA10 iE2:: SERVICING TROUBLESHOOTING GUIDE IMPORTANT: If the oven becomes inoperative because of a When troubleshooting the microwave oven, it is helpful to blown fuse in the monitor-upper latch switch follow the Sequence of Operation in performing the checks. circuit, check the monitor switch and upper Many of the possible causes of trouble will require that a latch switch before replacing the fuse.
  • Page 10 R4AlO R4A20 R4A30 TROUBLESHOOTING GUIDE (CONT’D) TEST PROCEDURE PROBLEM POSSIBLE CAUSE CORRECTION COOKING CONDITION (CONT’D) Oven lamp does not light at ail. Burned out bulb. Replace oven lamp. Open wiring to oven lamp socket. Check and repair wiring. Cook indicator appears in display but Defective relay RY-1 on control unit.
  • Page 11 R4AlO TEST PROCEDURE OR PROBLEM POSSIBLE CAUSE CORRECTION Programmed incorrectly EASY DEFROST will only operate EASY DEFROST condition touching on a specificweight. INSTANT COOK/START Pad, Range for each food category. “ERROR” appears. See steps for Easy Defrost is Operation Manual. Defective control unit.
  • Page 12 R4AlO R4A20 R4A30 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER MAGNETRON ASSEMBLY TEST DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPO- NENTS 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.
  • Page 13 R4AlO R4A20 R4A30 TEST PROCEDURES (CONT’D) PROCEDURE LETTER COMPONENT TEST 4. Room temperature should be around 20 “C. 5. Power supply voltage should be specification voltage. POWER TRANSFORMER TEST DISCHARGE THE HIGH VOLTAGE CAPACITAOR BEFORE TOUCHING ANY OVEN COMPO- NENTS OR WIRING. Disconnect the primary input terminals and measure the resistance of the transformer with an ohmmeter.
  • Page 14 R4AlO R4AZO R4A30 TEST PROCEDURES (CONT’D) PROCEDURE COMPONENT TEST LETTER MAGNETRON OVEN TEMP. FUSE TEST A continuity check across the temp. fuse terminals should indicate a closed circuit uniess the temperature of the temp. fuse reaches approximately 145 “C. An open magnetron temp. fuse indicates overheating of the magnetron assembly. If the temp.

  • Page 15: Touch Control Panel Assembly

    R4A10 E%1: TEST PROCEDURES (CONT’D) PROCEDURE LETTER COMPONENT TEST TOUCH CONTROL PANEL ASSEMBLY TEST The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore, unlike conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter and ohmmeter. in this service manual, the touch control panel assembly is di- vided into two units Control Unit and Key Unit and troubleshooting by unit replacement is de-...
  • Page 16 Et;00 R4A30 TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following ACL Circuit units as shown in the touch control panel circuit. A circuit to generate a signal which resets the LSI (1) Key Unit to the initial state when power is supplied.
  • Page 17 R4AlO EE23:: DESCRIPTION OF LSI LSI(IZA174DR) The I/O signal of the LSI(IZAf74DR) is detailed in the following table. (RD93101 1 SIGNAL 1 OUT PIN NO. Sianal to sound buzzer. A: Key touch sound (0.1 sec.). B: Completion sound (2.0 sec.). (RD93LAl 1 SIGNAL j VDD...
  • Page 18 R4A30 j OUT 1 SIGNAL 1 S2 PINNO. Segment data signal. Signal similar to FO. Key strobe sianal. Signal applied to touch-key section. A pulse signal is input to K4-K7 terminal while one of D-5 line keys on key matrix is touched. (RD939A3U) 1 OUT 1 SIGNAL...
  • Page 19 I I/O 1 OUT 1 SIGNAL j Dll -D9 PIN NO. 1 22-24 Diait selection signal. Refer to the touch control panel circuit about the relation between signals and digits. Normally, one pulse is output in every synchronized signal period, and input to the grid of the fluorescent display. (RD9 8Al U) I I/O...
  • Page 20 Ei;: R-4A30 / IN I 35 1 SIGNAL 1 K7 PIN NO. Signal cominQ from touch kev. When either one of D-8 line keys on key matrix is touched, a corresponding signal out of SO-S6 will be input into When no key is touched, the signal is held at “L” level. (RD93CAl Terminal for manufacture...
  • Page 21 included) of the touch control panel while 1. Precautions Handling Electronic keeping it in contact with the oven proper. Components On some models, on the other hand, the power This unit uses PMOS LSI in the integral part of the supply cord between the touch control panel circuits.

  • Page 22: Component Replacement

    kzz: R4A30 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE There is a broken door hinge or support. WARNING: To avoid possible exposure to microwave energy; The door is bent or warped. Before operating oven There is any defective parts in the latch, oven Make sure that unlatching door slowly is ac- door or microwave generating and transmission...
  • Page 23 R4A30 UPPER/LOWER LATCH SWITCHES, MONITOR SWITCH STOP SWITCH REMOVAL 1. Re-install each switch in its place. Disconnect oven from power supply and remove 2. Re-connect the wire leads to each switch. Refer to outer case. Discharge high voltage capacitor. chapter “Pictorial Diagram”. 3.
  • Page 24 Fzi% RQA30 UPPER/LOWER LATCH SWITCHES, MONITOR SWITCH AND STOP SWITCH ADJUSTMENT lf the Upper and Lower latch switches, monitor and stop switch do not operate properly due to a mis-adjustment, MONITOR the following adjustment should be made. SWITCH 1. Loosen the two (2) screws holding the latch hook to the oven cavity front flange.
  • Page 25 R4AlO DOOR REPLACEMENT AND ADJUSTMENT OOOR REPLACEMENT DOOR ADJUSTMENT When removing and/or loosening hinge such as in the case of ; 1. Disconnect the oven from the power supply and remove the door replacement, the following adjustment criteria are taken. outer case.

  • Page 26: Microwave Measurement

    R4A10 R4A20 R4A30 MICROWAVE MEASUREMENT After- adjustment of door latch switches, monitor Recommended instruments are: switch and door are completed individually or collec- NARDA 8100 tively, the following leakage test must be performed NARDA 8200 with a survey instrument and it must be confirmed that HOLADAY HI 1500 the result meets the requirements of the performance...
  • Page 27 MAIN SUPPLY Touch conrrol unit CORD LATCH SWITCH CN-0 MOTOR THE COLOA OF CN-A IS WHITE Figure S-l. Pictorial Diagram --------... -~--...
  • Page 28 $!MJ!=) (CM?d lOJ)lJO=) ‘2-S t3Jdhj MCI1 03ljO3dE YOMW ~lW.NWll YOlOW NitA0 %Z05NvyA “%E IrZ$...

  • Page 29: Printed Wiring Board

    Figure S-3. Printed Wiring Board...

  • Page 30: Parts List

    R4A30 PARTS LIST Note The voltage supplied to the parts “*” are greater than 25OV. Refer to “REPLACEMENT PARTS LIST” described at after PARTS LIST. REF. NO. PART DESCRIPTION ] Q’TY [CODE ELECTRICAL PARTS QACCAAOllWREO Mains supply cord QSOCLAOOlWREO Lamp socket QFSHDA002WREO Fuse holder...
  • Page 31 PC%8 R4A30 Note : The voltage supplied to the parts “*# are greater than 250V. PARTS LIST. Refer to “REPLACEMENT PARTS LIST” described at after REF. NO. PART NO. DESCRIPTION RH-IZA174DREO RH-IXAOlODREO IC ( pPC79L12J) Q20,83 VSDTC114ES/-3 Transistor (DTC114ES) VSDTA114ES/-3 Transistor (DTA114ES) VSDTD143ES/-3...

  • Page 32: R4Alo Rqazo R4A30

    R4AlO R4A20 R4A30 Note : The voltage supplied to the parts ‘I*” are greater than 250V. Refer to “REPLACEMENT PARTS LIST” described at after PARTS LIST. REF. NO. PART NO. DESCRIPTION Q’TY CODE GCOVHA082WRFO Choke cover (R-4AlO/R-4A20) 5- 4 GCOVHA074WRFO Choke cover (R-4A30)
  • Page 33 R4AlO R4A20 R4A30 CABINET PARTS I ’ .d ‘b .’ I ’ ? &a 2 -2 2- 7...
  • Page 34 R4AlO R4A20 R4A30 OVEN PARTS 2-15...
  • Page 35 R4AlO RQAPO R4A30 CONTROL PANEL PARTS DOOR PARTS MISCELLANEOUS ‘-7 6-7- 6-12...
  • Page 36 PACKING ADO KIT TURNTABLE TRAY ROLLER STAY OPERATION MANUAL DOOR PROTECTION COOK BOOKLET SHEET <a- 0 (SPA DPO336W R EO) SHRINK FILM SHEET TRAY HOLDER # (SPADFA049WREO) ACCESSORIES ASSENBLY Not Replaceable items ‘88 0 SHARP CORP. (8N0.75E) Printed in Australia...

This manual is also suitable for:

R-4a20R-4a30

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