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Sharp R-350D Service Manual
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Sharp R-350D Service Manual

Sharp R-350D Service Manual

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 ...................................................................................................................................................... 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
DEFROST
COOK
HELP
Info Display
PASTA MEAL
FROZEN DINNER
DINNER
PLATE
CASSEROL E
SOUP
PIZZA
BEVERAGE
PIE
MODEL
MEAT
VEGETAB LES
RICE/
PASTA
EXPRE SS
EASY
DEFRO ST
DEFRO ST
LESS
MORE
1
2
3
4
5
6
7
8
9
0
POW ER
LEVE L
CLOC K
TIME R
STOP
INSTA NT COOK
CLEA R
STAR T
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
MICROWAVE OVEN
R-350D
R-350D
S7005R350DPJ/
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Summary of Contents for Sharp R-350D

  • Page 1: Table Of Contents

    R-350D SERVICE MANUAL S7005R350DPJ/ MICROWAVE OVEN DEFROST COOK HELP Info Display PASTA MEAL FROZEN DINNER R-350D DINNER PLATE CASSEROL E SOUP PIZZA BEVERAGE MODEL MEAT VEGETAB LES RICE/ PASTA EXPRE SS EASY DEFRO ST DEFRO ST LESS MORE POW ER...
  • Page 2 R-350D...

  • Page 3: Caution Microwave Radiation

    MICROWAVE OVEN APPEARANCE VIEW R-350D 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-350D PRODUCT SPECIFICATIONS ITEM DESCRIPTION Power Requirements 230 - 240 Volts 50 Hertz Single phase, 3 wire earthed Power Consumption 1.6kW Power Output 1100 watts nominal of RF microwave energy (IEC Test Procedure) Operating frequency 2450 MHz Case Dimensions Width 520 mm...

  • Page 5: Appearance View

    R-350D APPEARANCE VIEW 1. Ventilation openings 2. Oven lamp 10.Digital readout 3. Door hinges 11.Waveguide cover 4. Door safety latches 12.Power supply cord 5. See through door 13.Rating label 6. Door seals and sealing surfaces 14.Turntable tray 7. Coupling 15.Turntable support 8.

  • Page 6: Operation Sequence

    Figure O-1 on page 25 first. 1. The display shows "SHARP MICRO-WAVE OVEN". After that the contacts (COM-NC) of the monitor 2. To set any programmes or set the clock, you must switch can be closed.

  • Page 7: Function Of Important Components

    R-350D FUNCTION OF IMPORTANT COMPONENTS DOOR OPEN MECHANISM OVEN THERMAL CUT-OUT The door is opened by pulling the door, refer to the Figure The thermal cut-out, located on the top of the oven cavity, D-1. is designed to prevent damage to the oven by fire. If the...

  • Page 8: Servicing

    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-350D CK = Check / RE = Replace TEST PROCEDURE A B C D E E E E G F H H I L M N O RECK CK RE CK CK CK CK CK POSSIBLE CAUSE DEFECTIVE PARTS PROBLEM...

  • Page 10: Test Procedure

    R-350D 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-350D TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Room temperature ....To = 21˚C Initial temperature ....T1 = 11 C Temperature after (38 + 2) = 40 sec..............T2 = 21 C Temperature difference Cold-Warm .............. T1 = 10 C Measured output power The equation is “P = 110 x T”...
  • Page 12 R-350D 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-350D TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER If incorrect readings are obtained, replace the monitor resistor. CARRY OUT 4R CHECKS. MOTOR WINDING TEST CARRY OUT 3D CHECKS. Disconnect the leads from the motor. Using an ohmmeter, check the resistance between the two terminals as described in the table below.
  • Page 14 R-350D TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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 divided into two...
  • Page 15 R-350D TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER RELAY TEST Remove the outer case and check voltage between Pin No 1 of the 2-pin connector (A) and the normal open terminal of the relay RY1 on the power unit with an A.C. voltmeter. The meter should indicate 230 - 240 volts, if not check oven circuit.

  • Page 16: Touch Control Panel

    R-350D 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-350D LSI(IXA049DR) The I/O signal of the LSI(IXA049DR) is detailed in the following table. Pin No. Signal Description AN10 Signal coming from touch key. When either G10 line on key matrix is touched, a corresponding signal out of P10 - P17 will be input into AN10.
  • Page 18 R-350D Pin No. Signal Description Oven lamp, fan motor and turntable motor driving signal To turn on and off shut off relay (RY1). The square 20.0 msec. waveform voltage is delivered to the RY1 driving H : GND circuit and RY2 control circuit.
  • Page 19 R-350D TOUCH CONTROL PANEL SERVICING apart from the oven proper; in this case you must short 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 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-350D from the noise filter. 9. Disconnect rectifier terminal from capacitor. 4. Disconnect the high voltage fuse from the power Now, the high voltage rectifier assembly is free. transformer. 10.Disconnect high voltage fuse from capacitor. 5. Disconnect filament lead of the power transformer from Now, the high voltage fuse is free.
  • 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-350D CAUTION: 4. Install the fan duct assembly to the oven cavity with the * Do not hit the fan blade strongly when installed one (1) screw. because the bracket may be disfigured. 5. Insert the snap of the main wire harness to the hole of...
  • Page 24 R-350D 1ST. LATCH SWITCH, 2ND. LATCH SWITCH, STOP 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-350D 4. Check for microwave leakage around door with an approved microwave survey meter. (Refer to Microwave Measurement Procedure.) Note: The door on a microwave oven is designed to act as an electronic seal preventing the leakage of microwave energy from oven cavity during cook cycle.

  • Page 26: Microwave Measurement

    R-350D 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-350D 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 2ND. LATCH 125˚C (OVEN) SWITCH FUSE M10A N.O. N.O. COM. RY-1 RY-2 H. V. FUSE 0.75A...

  • Page 28: Pictorial Diagram

    R-350D RECTIFIER H.V.

  • Page 29: Power Unit Circuit

    R-350D 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-350D SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 SEG16 SEG17 SEG18 TEST SEG19 SEG20 OSC1 OSC2 AVSS AN11 SEG35 AN10 4.7k C110 4.7k 4.7k 330pF/50v (J16) (J17) 330pF/50v 4.7k 330pF/50v (J14) (J15) 330pF/50v 4.7k 330pF/50v (J12) (J13) 330pF/50v 4.7k...
  • Page 31 R-350D DEFROST COOK HELP SEG9 SEG35 SEG8 SEG36 SEG7 SEG37 SEG6 SEG38 SEG5 SEG39 SEG4 COM16 SEG3 COM15 /50v SEG2 COM14 SEG1 COM13 C129 SEG0 COM12 COM7 COM11 COM6 COM10 COM5 COM9 COM4 COM8 COM3 COM2 COM1 COM0 OSC1 OSC2...

  • Page 32: Printed Wiring Board

    R-350D (RED) (GREEN) CN - C SH - B SH - A B R1 (CN - B) (J2) (D10) (J1) CN - A Figure S-5. Printed Wiring Board...

  • Page 33: Parts List

    R-350D 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-MA137WRE0 1st. latch switch/ 2nd. latch switch/ stop switch...
  • Page 34 R-350D 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 4-16 PCUSUA527WRP0 Cushion 4-17 PCUSUA512WRP0 Cushion 4-18 PCUSUA474WRP0 Cushion 4-19...

  • Page 35: Oven And Cabinet Parts

    R-350D OVEN AND CABINET PARTS 4-13 4-18 1-10 1-11 4-21 4-16 4-17 1-13 4-11 4-19 4-10 4-22 4-18 4-12 4-15 4-14 1-17 1-12 1-15 1-14 4-20 4-15 1-16 4-23...

  • Page 36: Door Parts

    R-350D 5-11 DOOR PARTS 5-10 CONTROL PANEL PARTS 5-10 MISCELLANEOUS 3-3-1 Actual wire harness may be different from illustration. TOP PAD ASSEMBLY FPADBA428WRKZ PACKING AND ACCESSORIES DOOR PROTECTION SHEET SPADPA204WRE0 PLASTIC BAG SSAKHA068WREZ 6- 8 INSTRUCTION BOOK & PRINTING MATTER...

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