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Sharp R-350F Service Manual

R-350f microwave oven
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See also: Operation Manual and Cookbook
CAUTION, MICROWAVE RADIATION ............................................................................................................. 1
WARNING .......................................................................................................................................................... 1
PRODUCT SPECIFICATIONS ......................................................................................................................... 2
GENERAL INFORMATION ................................................................................................................................ 2
APPEARANCE VIEW ....................................................................................................................................... 3
OPERATION SEQUENCE ................................................................................................................................ 4
FUNCTION OF IMPORTANT COMPONENTS ................................................................................................ 5
SERVICING AND TROUBLESHOOTING GUIDE ............................................................................................ 6
TEST PROCEDURE ......................................................................................................................................... 8
TOUCH CONTROL PANEL ............................................................................................................................. 14
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ........................................................... 18
MICROWAVE MEASUREMENT .................................................................................................................... 24
WIRING DIAGRAM ......................................................................................................................................... 25
PICTORIAL DIAGRAM ................................................................................................................................... 26
POWER UNIT CIRCUIT .................................................................................................................................. 27
CPU UNIT CIRCUIT ........................................................................................................................................ 28
PRINTED WIRING BOARD ............................................................................................................................. 29
PARTS LIST ................................................................................................................................................... 30
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
35
MICROWAVE OVEN
R-350F
R-350F
S7207R350FPJ/
Page

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  • Page 1: Table Of Contents

    R-350F SERVICE MANUAL S7207R350FPJ/ MICROWAVE OVEN R-350F 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 ................................
  • Page 2 R-350F...

  • Page 3: Caution Microwave Radiation

    MICROWAVE OVEN R-350F APPEARANCE VIEW GENERAL IMPORTANT INFORMATION This Manual has been prepared to provide Sharp Corp. Service OPERATING SEQUENCE engineers with Operation and Service Information. It is recommended that service engineers carefully study the entire text of this manual, so they will be qualified to render FUNCTION OF IMPORTANT satisfactory customer service.

  • Page 4: Product Specifications

    R-350F PRODUCT SPECIFICATIONS ITEM DESCRIPTION Power Requirements 230 - 240 Volts 50 Hertz Single phase, 3 wire earthed Power Consumption 1.75kW Power Output 1200 watts nominal of RF microwave energy (IEC Test Procedure) Operating frequency 2450 MHz Case Dimensions Width 520 mm...

  • Page 5: Appearance View

    R-350F APPEARANCE VIEW 1. Door handle 2. Oven lamp 3. Door hinges 4. Door safety latches 10.Digital readout 5. See through door 11.Ventilation openings 6. Door seals and sealing surfaces 12.Power supply cord 7. Coupling 13.Turntable tray 8. Wave guide cover 14.Turntable support...

  • Page 6: Operation Sequence

    1st. latch switch and Figure O-1 on page 25 2nd. interlock relay control switch must open their 1. The display shows "SHARP , MICRO-WAVE and contacts first. OVEN". After that the contacts (COM-NC) of the monitor 2.

  • Page 7: Function Of Important Components

    R-350F FUNCTION OF IMPORTANT COMPONENTS closed. However, when abnormally high temperatures are DOOR OPEN MECHANISM reached within the oven cavity, the oven thermal cut-out The door is opened by pulling the door, refer to the Figure will open at 125˚C, causing the oven to shut down. The D-1.

  • Page 8: Servicing And Troubleshooting Guide

    If the water remains cold carry out 3D checks and re- examine the connections to the component being Sharp recommend that wherever possible fault-finding tested. is carried out with the supply disconnected. It may in, some cases, be necessary to connect the supply after...
  • Page 9 R-350F CK = Check / RE = Replace TEST PROCEDURE A B C D E E F G G H K L M N RECK CK RE CK CKCK CK CK POSSIBLE CAUSE DEFECTIVE PARTS PROBLEM CONDITION Home fuse blows when power supply cord is plugged into wall outlet.

  • Page 10: Test Procedure

    R-350F 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 11 R-350F TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Room temperature ....To = 21˚C Initial temperature ....T1 = 11 C Temperature after (35 + 3) = 38 sec..............T2 = 21 C Temperature difference Cold-Warm .............. T1 = 10 C Measured output power The equation is “P = 120 x T”...
  • Page 12 R-350F TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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 13 R-350F TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Table: Resistance of Motor Motors Resistance Fan motor Approximately 405 Turntable motor Approximately 14.8 k If incorrect readings are obtained, replace the motor. CARRY OUT 4R CHECKS BLOWN FUSE F10A CARRY OUT 3D CHECKS.
  • Page 14 R-350F TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 1. Key Unit. Note: Check key unit ribbon connection before replacement. The following symptoms indicate a defective key unit. Replace the key unit. a) When touching the pads, a certain pad produces no signal at all.
  • Page 15 R-350F TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER RY1 and RY2 Relay Test These relays are operated by D.C. voltage. Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation. DC. voltage indicated ....Defective relay.

  • Page 16: Touch Control Panel

    R-350F TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following units. 3) Power Source Circuit This circuit generates voltages necessary in the control (1) Key Unit unit from the AC line voltage.
  • Page 17 R-350F Pin No. Signal Description 19-21 P27-P25 Terminal not used. 22-26 P24-P20 Terminal not used. To input signal which communicates the door open/close information to LSI. Door close "H" level signal (0V). Door open "L" level signal (-5V). Terminal not used.
  • Page 18 R-350F Pin No. Signal Description Signal similar to P17. When either G12 line on key matrix is touched, a corresponding signal will be input into P14. AIN7 Signal similar to P17. When either G13 line on key matrix is touched, a corresponding signal will be input into AIN7.
  • Page 19 R-350F TOUCH CONTROL PANEL SERVICING touch control panel with a jumper, which brings about 1. Precautions for Handling Electronic Components an operational state that is equivalent to the oven door This unit uses CMOS LSI in the integral part of the being closed.

  • Page 20: Component Replacement And Adjustment Procedure

    Oven lamp, Magnetron, High voltage transformer manners. and Oven cavity. 1. Before wiring, 3) Sharp edge: 1) Disconnect the power supply. Bottom plate, Oven cavity, Waveguide flange, 2) Open the door and wedge the door open. Chassis support and other metallic plate.
  • Page 21 R-350F HIGH VOLTAGE RECTIFIER, HIGH VOLTAGE FUSE AND HIGH VOLTAGE CAPACITOR REMOVAL 1. CARRY OUT 3D CHECKS. 8. Remove one (1) screw holding high voltage rectifier 2. Disconnect the brown and blue wires of power supply assembly to capacitor holder.
  • Page 22 4. Where the corners have been snipped off bend corner areas flat. No sharp edge must be evident after removal NOTE: The one (1) screw to fit the turntable motor cover of the turntable motor cover.
  • Page 23 R-350F 5. Insert the snap of the main wire harness to the hole of 6. Install the chassis support and the magnetron to oven the fan duct and insert the main wire harness into the cavity. hole of the fan duct.
  • Page 24 R-350F 1ST. LATCH SWITCH, 2ND. INTERLOCK RELAY CONTROL SWITCH AND MONITOR SWITCH ADJUSTMENT If the 1st. latch switch, 2nd. latch switch, stop switch and door toward the oven face. Both results (play in the monitor switch do not operate properly due to a door) should be less than 0.5mm.
  • Page 25 R-350F radiation emission limitation standards. SEALER FILM After any service, make sure of the following : Installation 1. Door latch heads smoothly catch latch hook through 1. Put the adhesive tape on the backing film of the sealer latch holes and that latch head goes through center of film as shown in Fig.

  • Page 26: Microwave Measurement

    R-350F MICROWAVE MEASUREMENT After adjustment of door latch switches, monitor switch Recommended instruments are: and door are completed individually or collectively, the NARDA 8100 following leakage test must be performed with a survey NARDA 8200 instrument and it must be confirmed that the result meets...

  • Page 27: Wiring Diagram

    R-350F SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED NOTE: " " indicates components with potentials above 250V. 2. CLOCK APPEARS ON DISPLAY THERMAL NOISE FILTER CUT-OUT 125˚C (OVEN) FUSE F10A N.O. COM. COM. N.O. RY-1 RY-2 H. V. FUSE 0.75A...

  • Page 28: Pictorial Diagram

    R-350F RECTIFIER H.V. COM.

  • Page 29: Power Unit Circuit

    R-350F CN-C 12PIN LEAD WIRE HARNESS Q2 2SB1238 R4 27 R5 4.7k D1-D4 11ES1 CN-A 1SS270A 1SS270A – – R2 510 1w R3 390 1/2w SP1 PKM22EPT Q3 KRC243M BUZZER R6 3.3k OVEN LAMP TURNTABLE OVEN LAMP MOTOR TURNTABLE FAN MOTOR MOTOR –...

  • Page 30: Cpu Unit Circuit

    R-350F COM8 COM8 COM7 COM6 COM5 COM4 COM3 COM2 COM15 COM1 SEG1 SEG39 SEG2 SEG3 SEG4 SEG5 SEG34 SEG6 SEG7 SEG33 COM13 SEG8 SEG32 COM12 SEG9 SEG31 COM11 SEG10 SEG30 COM10 SEG11 SEG29 COM9 SEG12 SEG28 COM8 SEG13 SEG27 AIN0...

  • Page 31: Printed Wiring Board

    R-350F (RED) (GREEN) CN - C SH - B SH - A B R1 (CN - B) (J2) (R9) (D10) (CN - D) (J1) CN - A Figure S-4. Printed Wiring Board...

  • Page 32: Parts List

    R-350F 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 ELECTRIC PARTS 1- 1 QSW-MA147WRZZ 1st. latch switch/ 2nd. interlock relay control switch...
  • Page 33 R-350F 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- 7 FOVN-A508WRTZ Oven cavity 4- 8 LANGFA196WRWZ Chassis support...
  • Page 34 R-350F OVEN AND CABINET PARTS 4-13 4-18 4-25 4-23 4-21 4-16 4-26 4-17 1-13 4-11 4-10 4-27 4-19 4-24 6-10 4-12 4-15 4-14 4-22 1-10 1-12 1-15 1-14 4-20 4-15 1-11 4-18 4-28...
  • Page 35 R-350F CONTROL PANEL PARTS DOOR PARTS 5-11 3-3-1 5-10 5-10 MISCELLANEOUS Actual wire harness may be different from illustration.

  • Page 36: Packing And Accessories

    R-350F TOP PAD ASSEMBLY FPADBA428WRKZ PACKING AND ACCESSORIES DOOR PROTECTION SHEET SPADPA204WRE0 PLASTIC BAG SSAKHA034WRE0 6- 8 INSTRUCTION BOOK & PRINTING MATTER 6- 2 TURNTABLE TRAY BOTTOM PAD ASSEMBLY FPADBA491WRKZ 6- 1 TURNTABLE SUPPORT TRAY PACK INTO THE SPADFA451WRE0 OVEN CAVITY Not replaceable items.

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