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Sharp R-350B Service Manual

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 ................................................................................................ 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
HELP
MODEL
Pasta Meal
Frozen Dinner
DINNER
CASSEROL E
PLATE
SOUP
PIZZA
VEVERAGE
PIE
VEGETA BLES
RICE/PA STA
MEAT
EASY DEFROST
1
2 3
4
5
6
7 8
9 O
LESS
POWE R LEVEL
MORE
TIMER
CLOCK
AUTO START
STOP
INSTAN T 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-350B
R-350B
S5803R350BPJ/
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  • Page 1: Table Of Contents

    R-350B SERVICE MANUAL S5803R350BPJ/ MICROWAVE OVEN R-350B HELP MODEL Pasta Meal Frozen Dinner DINNER CASSEROL E PLATE SOUP PIZZA VEVERAGE VEGETA BLES RICE/PA STA MEAT EASY DEFROST LESS POWE R LEVEL MORE TIMER CLOCK AUTO START STOP INSTAN T COOK...
  • Page 2 R-350B...

  • Page 3: Caution Microwave Radiation

    MICROWAVE OVEN APPEARANCE VIEW R-350B 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-350B PRODUCT SPECIFICATIONS ITEM DESCRIPTION Power Requirements 230 - 240 Volts 50 Hertz Single phase, 3 wire earthed Power Consumption 1.5kW Power Output 1000 watts nominal of RF microwave energy (IEC 705) Operating frequency 2450 MHz Case Dimensions Width 520 mm...

  • Page 5: Appearance View

    R-350B APPEARANCE VIEW 11 13 1. Ventilation openings 9. Touch control panel 2. Oven lamp 10.Digital readout 3. Door hinges 11.Wave guide 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...

  • Page 6: Operation Sequence

    The monitor switch is mechanically controlled by Figure O-1 on page 25 oven door, and monitors the operation of the 1st and 1. The display shows "SHARP", MICRO-WAVE" and 2nd. latch switches. "OVEN". 6-1 When the oven door is opened during or after the 2.

  • Page 7: Function Of Important Components

    R-350B FUNCTION OF IMPORTANT COMPONENTS DOOR OPEN MECHANISM The rated peak reverse voltage of D1 of the asymmetric rectifier is 6 KV The rated peak reverse voltage of D2 of the The door is opened by pushing the open button on the asymmetric rectifier is 1.7 KV.

  • Page 8: Servicing

    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 the outer case has been removed, in this event carry out 3D checks and then disconnect the leads to the primary of the power transformer.
  • Page 9 R-350B CK = Check / RE = Replace TEST PROCEDURE A B C D E E E E G F H H I K L M N RECKCKRE CK CKCKCK CK POSSIBLE CAUSE DEFECTIVE PARTS PROBLEM CONDITION Home fuse blows when power supply cord is plugged into wall outlet.

  • Page 10: Test Procedure

    R-350B 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-350B TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Initial temperature ..................... T1 = 11 C Temperature after (42 + 2) = 44 sec..............T2 = 21 C Temperature difference Cold-Warm .............. T1 = 10 C Measured output power The equation is “P = 100 x T” ........... P = 100 x 10 C = 1000 Watts JUDGMENT: The measured output power should be at least 15 % of the rated output power.
  • Page 12 R-350B TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER the reading obtained. Reverse the meter leads and note this second reading. If an open circuit is indicated in both direction then the asymmetric rectifier is good. If an asymmetric rectifier is shorted in either direction, then the asymmetric rectifier is probably faulty and must be replaced with high voltage rectifier.
  • Page 13 R-350B TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER this may be due to over heating produced by improper setting of the cooking time or failure of the control panel. 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 14 R-350B TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER If incorrect readings are obtained, replace the noise filter unit. CARRY OUT 4R CHECKS. 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.
  • Page 15 R-350B TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER RELAY TEST Remove the outer case and check voltage between Pin No 3 of the 2-pin connector (A) and the common terminal of the relay RY2 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-350B 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 con- (1) Key Unit trol unit from the AC line voltage.
  • Page 17 R-350B Pin No. Signal Description RESET Auto clear terminal. Signal is input to reset the LSI to the initial state when power is applied. Temporarily set to "L" level the moment power is applied, at this time the LSI is reset. Thereafter set at "H" level.
  • Page 18 R-350B Pin No. Signal Description Power source voltage: -5V. The power source voltage to drive the LSI is input to VSS terminal. Connected to VC. 31-32 VL3-VL2 Power source voltage input terminal. Standard voltage for LCD. Power source voltage input terminal.
  • Page 19 R-350B TOUCH CONTROL PANEL SERVICING both ends of the door sensing switch (on PWB) of the 1. Precautions for Handling Electronic Components touch control panel with a jumper, which brings about This unit uses CMOS LSI in the integral part of the an operational state that is equivalent to the oven door circuits.

  • Page 20: Component Replacement And Adjustment Procedure

    Please refer to ‘OVEN PARTS, CABINET PARTS, CONTROL PANEL PARTS, DOOR PARTS’, when carrying out any of the following removal procedures: WARNING FOR WIRING and Oven cavity. To prevent an electric shock, take the following 3) Sharp edge: manners. Bottom plate, Oven cavity, Waveguide flange, 1. Before wiring, Chassis support and other metallic plate.
  • Page 21 R-350B HIGH VOLTAGE RECTIFIER AND HIGH VOLTAGE CAPACITOR REMOVAL 1. CARRY OUT 3D CHECKS. 8. Disconnect rectifier terminal from capacitor. 2. Disconnect the brown and blue wires of power supply Rectifier and high voltage assembly is now free. cord from the noise filter.
  • 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-350B 2. Install the fan blade to the fan motor shaft according the installation. following procedure. * Make sure that the axis of the shaft is not slanted. 1) Hold the center of the bracket which supports the shaft 3. Catch three holes of fan duct on three tabs of the of the fan motor on the flat table.
  • Page 24 R-350B 2. The 1st. latch switch, 2nd. latch switch and stop switch and forth, and up and down. In and out play of the door interrupt the circuit before the door can be opened. allowed by the upper and lower position of the latch 3.
  • Page 25 R-350B about how to handle new one. 6. Catch two (2) pins of door panel on two (2) hole of upper and lower oven hinges. 7. Re-install choke cover to door panel by pushing. Note: After any service to the door;...

  • Page 26: Microwave Measurement

    R-350B 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-350B SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED NOTE: " " indicates components with potentials above 250V. 2. CLOCK APPEARS ON DISPLAY COM. N.O. Figure O-1. Oven Schematic-OFF Condition SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED 2. COOKING TIME PROGRAMMED 3.

  • Page 28: Pictorial Diagram

    R-350B RECTIFIER H.V. RECTIFIER ASYMMETRIC...

  • Page 29: Power Unit Circuit

    R-350B CPU UNIT WH-1 Q2 2SB1238 2 PIN R4 27 1 PIN (2-pin harness) D1-D4 R5 4.7k 11ES1 AC230-240V 50Hz – 390 1/2w 510 1w BUZZER TURNTABLE R6 3.3k MOTOR OVEN LAMP TURNTABLE MOTOR MOTOR 10 /35v OVEN LAMP –...
  • Page 30 R-350B SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 SEG16 SEG17 SEG18 SEG19 SEG20 SEG21 SEG22 SEG23 SEG13 SEG24 SEG25 SEG14 SEG26 SEG15 SEG27 SEG16 SEG28 SEG17 SEG29 SEG18 SEG19 SEG30 SEG20 SEG31 SEG15 SEG21 SEG22 SEG23 SEG24 SEG25 SEG26 SEG32 SEG27...

  • Page 31: Printed Wiring Board

    R-350B CN - C (C3) (D9) (CN - B) (R1) (J3) DOOR SW (J2) (ZD1) VRS1 (J1) (RY3) LOT NO. Figure S-4. Printed Wiring Board...

  • Page 32: Parts List

    R-350B 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-MA110WRE0 1st. latch switch, 2nd. latch switch and stop switch...
  • Page 33 R-350B 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- 3 PHOK-A106WRF0 Latch hook 4- 4 LBNDKA099WRW0 Capacitor holder...
  • Page 34 R-350B OVEN AND CABINET PARTS 4-18 1-11 1-10 4-10 1-13 4-17 4-16 6-11 4-15 4-12 4-13 4-14 1-12 1-15 4-11 1-14 4-15 1-16...
  • Page 35 R-350B CONTROL PANEL PARTS 3-1B 3-1D 3-3-1 DOOR PARTS 4-19 MISCELLANEOUS (CAPACITOR) 6-10 Actual wire harness may be different from illustration.

  • Page 36: Packing And Accessories

    R-350B PACKING AND ACCESSORIES TOP PAD ASSEMBLY FPADBA311WRK0 DOOR PROTECTION SHEET SPADPA204WRE0 PLASTIC BAG SSAKHA034WRE0 PRINTING MATTER 6- 2 TURNTABLE TRAY BOTTOM PAD ASSEMBLY FPADBA351WRK0 6- 1 TURNTABLE SUPPORT TRAY PACK INTO THE SPADFA397WRE0 OVEN CAVITY Not replaceable items. PACKING CASE SPAKCD109WRE0 '98SHARP CORP.

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