Sharp R-9H58 Service Manual
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Sharp R-9H58 Service Manual

Convection microwave oven
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CAUTION, MICROWAVE RADIATION ............................................................................................................. 1
WARNING ...........................................................................................................................................................1
PRODUCT SPECIFICATIONS .......................................................................................................................... 2
GENERAL INFORMATION ................................................................................................................................ 2
APPEARANCE VIEW ........................................................................................................................................ 3
OPERATION SEQUENCE ................................................................................................................................ 4
FUNCTION OF IMPORTANT COMPONENTS ................................................................................................. 7
SERVICING ..................................................................................................................................................... 10
TEST PROCEDURE ........................................................................................................................................ 12
TOUCH CONTROL PANEL ............................................................................................................................. 20
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ............................................................ 26
MICROWAVE MEASUREMENT ..................................................................................................................... 31
WIRING DIAGRAM ......................................................................................................................................... 32
PICTORIAL DIAGRAM .................................................................................................................................... 34
CONTROL PANEL CIRCUIT ........................................................................................................................... 35
PRINTED WIRING BOARD ............................................................................................................................. 36
PARTS LIST ..................................................................................................................................................... 37
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
S8606R9H58PJ/
CONVECTION
MICROWAVE OVEN
R-9H58
R-9H58
Page

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  • Page 1: Table Of Contents

    R-9H58 SERVICE MANUAL S8606R9H58PJ/ CONVECTION MICROWAVE OVEN R-9H58 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 Page CAUTION, MICROWAVE RADIATION ......................1 WARNING ................................1...
  • Page 2 R-9H58...

  • Page 3: Caution Microwave Radiation

    MICROWAVE OVEN R-9H58 APPEARANCE VIEW GENERAL IMPORTANT INFORMATION This Manual has been prepared to provide Sharp Corp. Service engineers with Operation and Service Information. OPERATING SEQUENCE 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: Product Specifications

    R-9H58 PRODUCT SPECIFICATIONS ITEM DESCRIPTION Power Requirements 230 - 240 Volts 50 Hertz Single phase, 3 wire earthed Power Consumption 1500 W (Microwave) 1600 W (Convection) Power Output 850 watts (IEC-705-1988 ) Operating frequency of 2450MHz Convection heater 1500 W...

  • Page 5: Appearance View

    R-9H58 APPEARANCE VIEW 1. Ventilation opening 2. Oven lamp 3. Door hinges 4. Door safety latches 5. See through door 6. Door seal and sealing surfaces 7. Door open button 8. Touch control panel 9. Digital readout 10. Wave guide cover 11.

  • Page 6: Operation Sequence

    (Figure O-1): 2) When the door is closed, from the open position, the 1. The display flashes “SHARP”, "MICRO-", "WAVE", monitor switch contacts first open, and then the contacts 'OVEN".
  • Page 7 R-9H58 unit de-energizing the relay (RY4) and opening the 4. The heater relay (RY3) is energized, adding the mains circuit to the damper motor. supply voltage to the convection heater. 3. The coil of heater relay (RY3) is energized by the CPU 5.
  • Page 8 R-9H58 2. The cooking time will appear on the display and start counting down to zero. The cooking time is adjusted automatically according to the weight of the food. 3. The shut-off relays (RY1, RY3, RY5 and RY6) are energized, turning on the oven lamp, turntable motor, cooling fan motor and convection motor.

  • Page 9: Function Of Important Components

    R-9H58 IMPORTANT: 32 (sec.) 64 (sec.) 6 sec. During sensor cooking operation, the fire sensing CONVECTION MOTOR operation sequence will not begin until the AH sensor has detected vapours and initiated a sensor cooking 3 sec. cycle. This is because the operation of the convection...
  • Page 10 R-9H58 2. The fuse also blows when upper latch switch and rounding the magnetron and cools the magnetron. This air lower latch switch remain closed with the oven door is channelled through the oven cavity to remove steam open and when the monitor switch closes.
  • Page 11 R-9H58 NOISE FILTER It is then exhausted at the top of the oven cavity into a condensation compartment. The noise filter prevents the radio frequency interference that might flow back in the power circuit. Convection Cooking: Damper is in the closed position, so that no hot air will be allowed to leak out the oven cavity.

  • Page 12: Servicing

    If the water remains cold carry out 3D checks and re- examine the 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 13 R-9H58 CK = Check / RE = Replace TEST PROCEDURE A B C D E E E F G G H I J J J J K M N O O O O O O P Q RE CKCK CK RE...

  • Page 14: Test Procedure

    R-9H58 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER MAGNETRON TEST NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL WHILE THE OVEN IS IN OPERATION. CARRY OUT 3D CHECK. Isolate the magnetron from high voltage circuit by removing all leads connected to filament terminal.
  • Page 15 R-9H58 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Initial temperature ..................... T1 = 11 C Temperature after (49 + 2) = 51 sec..............T2 = 21 C Temperature difference Cold-Warm ............... T1 = 10 C Measured output power The equation is “P = 85 x T” ..........P = 85 x 10 C = 850 Watts JUDGMENT: The measured output power should be at least 15 % of the rated output power.
  • Page 16 R-9H58 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER rectifier, high voltage wire or filament winding of the power transformer is shorted. CARRY OUT 4R CHECKS. NOTE: FOR MEASUREMENT OF THE RESISTANCE OF THE RECTIFIER, THE BATTERIES OF THE MEASURING INSTRUMENT MUST HAVE A VOLTAGE AT LEAST 6 VOLTS, BECAUSE OTHERWISE AN INFINITE RESISTANCE MIGHT BE SHOWN IN BOTH DIRECTIONS.
  • Page 17 R-9H58 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Table: Temperature Fuse and Thermal cut-out Test Temperature of “ON” condition Temperature of “OFF” condition Indication ofohmmeter Parts Name (closed circuit) (˚C) (open circuit) (˚C) (When room temperature is approx. 20˚C) Temp. fuse 150˚C This is not resetable type.
  • Page 18 R-9H58 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER If incorrect readings are obtained, replace the motor. CARRY OUT 4R CHECKS. MONITOR RESISTOR TEST CARRY OUT 3D CHECKS. Disconnect the leads from the monitor resist. Using an ohmmeter and set on a low range. Check between the terminals of the monitor resistor.
  • Page 19 R-9H58 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 2-3 Other possible troubles caused by defective control unit. a) Buzzer does not sound or continues to sound. b) Clock does not operate properly. c) Cooking is not possible. d) Proper temperature measurement is not obtained.
  • Page 20 R-9H58 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER STEPS OCCURRENCE CAUSE OR CORRECTION The rated voltage is not applied between Pin Check supply voltage and oven power cord. No. 9 of the 5-pin connector (A) and the common terminal of the relay RY1.
  • Page 21 R-9H58 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER TESTING METHOD FOR AH SENSOR AND/OR CONTROL UNIT To determine if the sensor is defective, the simplest method is to replace it with a new replacement sensor. (1) Disconnect oven from power supply and remove outer case.

  • Page 22: Touch Control Panel

    R-9H58 TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following units 4) ACL Circuit as shown in the touch control panel circuit. A circuit to generate a signals which resetting the LSI to the initial state when power is applied.
  • Page 23 R-9H58 DESCRIPTION OF LSI LSI(IZA736DR): The I/O signals of the LSI(IZA736DR) are detailed in the following table. Pin No. Signal Description Connected to GND. Anode (segment) of Fluorescent Display light-up voltage: -30V. Vp voltage of power source circuit input. AVSS Power source voltage: -5V.
  • Page 24 R-9H58 Pin No. Signal Description Magnetron high-voltage circuit driving signal. To turn on and off the cook relay(RY2). In HIGH operation, the VARI MODE ON TIME OFF TIME signals holds "L" level during micro- HIGH (100% power) 32 sec. 0 sec.
  • Page 25 R-9H58 Pin No. Signal Description Signal similar to P27. When any one of G-3 line key on key matrix is touched, a corresponding signal will be input into P25. Signal similar to P27. When any one of G-4 line key on key matrix is touched, a corresponding signal will be input into P24.
  • Page 26 R-9H58 Pin No. Signal Description 54-56 P02-P00 Digit selection signal. Signal similar to P55. 57-59 P37-P35 Digit selection signal. Signal similar to P55. 60-64 P34-P30 Used for initial balancing of the bridge circuit (absolute humidity sensor). ABSOLUTE HUMIDITY SENSOR CIRCUIT...
  • Page 27 R-9H58 SERVICING 1. Precautions for Handling Electronic Components For those models, check and repair all the controls This unit uses CMOS LSI in the integral part of the (sensor-related ones included) of the touch control circuits. When handling these parts, the following panel while keeping it connected to the oven.

  • Page 28: Component Replacement And Adjustment Procedure

    R-9H58 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below before operating the oven. 1. Disconnect the oven from power supply. 1. Door does not close firmly. 2. Make sure that a definite” click” can be heard when the 2.
  • Page 29 R-9H58 ASYMMETRIC RECTIFIER AND HIGH VOLTAGE RECTIFIER REMOVAL 1. CARRY OUT 3D CHECKS. CAUTION: WHEN REPLACING HIGH VOLTAGE REC- 2. Remove one (1) screw holding the high voltage rectifier TIFIER ASSEMBLY, ENSURE THAT THE terminal to the capacitor holder. EARTHING SIDE TERMINAL MUST BE SE- 3.
  • Page 30 R-9H58 3. Disconnect wire lead from the turntable motor. 5. Pull the turntable coupling out of the oven cavity. 4. Remove the two (2) screws holding the turntable motor 6. Turntable coupling and motor will be free. to the mounting plate of the oven cavity bottom.
  • Page 31 R-9H58 CORD HOLDER REMOVAL 1. Remove the one (1) special screw holding the cord holder to the rear cabinet, using the special driver LHSTIX DLR4-100T. 2. Now, the cord holder is free. NOTE: When securing or loosening the special screw, LHSTIX DLR4-100T type screw driver should be used.
  • Page 32 R-9H58 DOOR DISASSEMBLY After adjustment, make sure of the following : Remove door assembly, refer to “Door Replacement”. 1. Door latch heads smoothly catch the latch hook through Replacement of door components are as follows: the latch holes, and the latch head goes through the 1.

  • Page 33: Microwave Measurement

    R-9H58 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 HOLADAY HI 1500 instrument and it must be confirmed that the result meets...

  • Page 34: Wiring Diagram

    R-9H58 SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. CLOCK APPERARS ON DISPLAY NOTE: indicates components with potential above 250V. Figure O-1. Oven Schematic-OFF Condition SCHEMATIC SCHEMATIC SCHEMATIC NOTE: CONDITION OF OVEN NOTE: CONDITION OF OVEN NOTE: CONDITION OF OVEN 1.
  • Page 35 R-9H58 SCHEMATIC NOTE: CONDITION OF OVEN NOTE: indicates components with potential above 250V. 1. DOOR CLOSED. 2. CONVECTION PAD TOUCHED. 3. DESIRED TEMP. PAD TOUCHED. 4. START PAD TOUCHED. Figure O-3. Oven Schematic-Convection Cooking Condition SCHEMATIC NOTE: CONDITION OF OVEN 1.

  • Page 36: Pictorial Diagram

    R-9H58 HV. RECTIFIER...

  • Page 37: Control Panel Circuit

    R-9H58 3.3k 3.3k 3.3k 3.3k 3.3k 3.3k 3.3k 100k 100k 100k 3.3k R100 3.3k 3.3k 3.3k 3.3k IZA736DR 4.7k 2.2kF (J7) 4.7k (J5) HZ4A2 100F (J3) /35v (J6) /50v (J4) /50v 0.01 HZ5C2 (J2) /25v 3.3k /35v /50v /50v HZ16-1...

  • Page 38: Printed Wiring Board

    R-9H58 (C81) R86(J8) (C80) (R45) (C45) (CN - D) (R47) (R48) (R49) (C46) (C47) (J7) (J5) (J3) (J2) (J4) (J6) CONV HEATER COM Figure S-3. Printed Wiring Board...

  • Page 39: Parts List

    R-9H58 PARTS LIST 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 ELECTRICAL PARTS 1- 1 FH-DZA058WRK0 High voltage rectifier assembly...
  • Page 40 R-9H58 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 RH-IZA495DRE0 VS2SB910MR/-4 Transistor (2SB910M) VSKRA101M//-3 Transistor (KRA101M) VSDTA123ES/-3 Transistor (DTA123E)
  • Page 41 R-9H58 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 4-32 PDUC-A269WRW0 Damper duct 4-33 PDUC-A270WRF0 Cooling fan duct 4-34...
  • Page 42 R-9H58 HOW TO ORDER REPLACEMENT PARTS To have your order filled prompty and correctly, please furnish the following information. 1. MODEL NUMBER 2. REF. NO. 3. PART NO. 4. DESCRIPTION PACKING AND ACCESSORIES TRAY HOLDER (SPADFA348WRE0) PACKING PAD KIT CPADBA083WRK0...
  • Page 43 R-9H58...
  • Page 44 R-9H58 CONTROL PANEL PARTS 7-10 3-1E 7-10 3-1F 3-2-2 7-10 3-2-1 DOOR PARTS 7-19 x3 5-10 7-17 7-25 7-18 7-17 MISCELLANEOUS Actual wire harness may be different than illustration. '96SHARP CORP. (8K0.820E) Printed in Australia...

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