Sharp R-450B Service Manual
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Sharp R-450B Service Manual

Sharp R-450B Service Manual

Microwave oven
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SUPPLEMENTAL SERVICE MANUAL
This is a supplemental Service Manual for Model R-450B. This model is quite similar to base model R-450A. Use
this supplemental manual together with the Base Model Service Manual (Refer No. is S3702R450APJ/) for
complete operation, service information, etc..
CAUTION, MICROWAVE RADIATION ............................................................................................................. 1
WARNING .......................................................................................................................................................... 1
PRODUCT SPECIFICATIONS ......................................................................................................................... 2
GENERAL INFORMATION ................................................................................................................................ 2
APPEARANCE VIEW ....................................................................................................................................... 3
TEST PROCEDURE .......................................................................................................................................... 4
TOUCH CONTROL PANEL ............................................................................................................................... 6
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ............................................................ 10
MICROWAVE MEASUREMENT ..................................................................................................................... 12
WIRING DIAGRAM .......................................................................................................................................... 13
PICTORIAL DIAGRAM .................................................................................................................................... 14
POWER UNIT CIRCUIT .................................................................................................................................. 15
CPU UNIT CIRCUIT ........................................................................................................................................ 16
PRINTED WIRING BOARD ............................................................................................................................. 17
PARTS LIST .................................................................................................................................................... 18
HELP
MODEL
Pasta Meal
Frozen Dinner
DINNER
CASSERO LE
PLATE
SOUP
PIZZA
VEVERAG E
PIE
VEGETA BLES
RICE/PA STA
MEAT
EASY DEFROS T
1
2 3
4
5
6
7 8
9 O
LESS
POWE R LEVEL
MORE
TIMER
CLOC K
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-450B
R-450B
S5804R450BPJ/
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Summary of Contents for Sharp R-450B

  • Page 1: Table Of Contents

    This is a supplemental Service Manual for Model R-450B. This model is quite similar to base model R-450A. Use this supplemental manual together with the Base Model Service Manual (Refer No. is S3702R450APJ/) for complete operation, service information, etc..
  • Page 2 R-450B...

  • Page 3: Caution Microwave Radiation

    MICROWAVE OVEN APPEARANCE VIEW R-450B GENERAL IMPORTANT INFORMATION This Manual has been prepared to provide Sharp Corp. Service TEST PROCEDURE engineers with Operation and Service Information. It is recommended that service engineers carefully study the entire text of this manual and base model's manual, so they will TOUCH CONTROL PANEL be qualified to render satisfactory customer service.

  • Page 4: Product Specifications

    R-450B PRODUCT SPECIFICATIONS ITEM DESCRIPTION Power Requirements 230 - 240 Volts 50 Hertz Single phase, 3 wire earthed Power Consumption 1.55 kW Power Output 1000 watts nominal of RF microwave energy (IEC 705) Operating frequency 2450 MHz Case Dimensions Width 550 mm...

  • Page 5: Appearance View

    R-450B APPEARANCE VIEW 1. Ventilation openings 9. Touch control panel 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.Menu label 7.

  • Page 6: Test Procedure

    R-450B TEST PROCEDURES (CONT'D) PROCEDURE COMPONENT TES 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.
  • Page 7 R-450B TEST PROCEDURES (CONT'D) PROCEDURE COMPONENT TES LETTER RELAY TEST CARRY OUT 3D CHECKS. 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 8: Touch Control Panel

    R-450B 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 9 R-450B 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 10 R-450B 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 11 R-450B TOUCH CONTROL PANEL SERVICING 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 12: 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 transformer and Oven cavity. To prevent an electric shock, take the following 3) Sharp edge: manners. Bottom plate, Oven cavity, Waveguide flange, 1. Before wiring, 1) Disconnect the power supply.
  • Page 13 R-450B 14.Remove the three (3) screws holding the door panel to (B) An approved microwave survey meter should be the door frame. used to assure compliance with proper microwave 15.Release door panel from nine (9) tabs of door frame by radiation emission limitation standards.

  • Page 14: Microwave Measurement

    R-450B 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 15: Wiring Diagram

    R-450B SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. CLOCK APPEARS ON DISPLAY. NOTE: " " indicates components with potentials above 250V. Figure O-1. Oven Schematic-OFF Condition SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. COOKING TIME PROGRAMMED.

  • Page 16: Pictorial Diagram

    R-450B RECTIFIER ASYMMETRIC...

  • Page 17: Power Unit Circuit

    R-450B CPU UNIT WH-1 Q2 2SB1238 2 PIN R4 27 1 PIN (2-pin harness) D1-D4 R5 4.7k 11ES1 AC230-240V 50Hz – 510 1w 390 1/2w BUZZER TURNTABLE R6 3.3k MOTOR OVEN LAMP TURNTABLE MOTOR MOTOR 10 /35v OVEN LAMP –...
  • Page 18 R-450B SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 SEG16 SEG17 SEG18 SEG19 SEG20 SEG21 SEG22 SEG23 SEG24 SEG13 SEG14 SEG25 SEG26 SEG15 SEG16 SEG27 SEG28 SEG17 SEG29 SEG18 SEG30 SEG19 SEG31 SEG20 SEG21 SEG15 SEG22 SEG23 SEG24 SEG25 SEG26 SEG32 SEG27...

  • Page 19: Printed Wiring Board

    R-450B CN - C (C3) (D9) (CN - B) (R1) (J3) DOOR SW (J2) (ZD1) VRS1 (J1) (RY3) LOT NO. Figure S-4. Printed Wiring Board...

  • Page 20: Parts List

    R-450B 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 QFS-TA014WRE0 Temp. fuse 150˚C (MG)
  • Page 21 R-450B 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 OVEN PARTS 4- 1 PHOK-A095WRF0 Latch hook 4- 2 LBNDKA132WRP0...
  • Page 22 R-450B OVEN AND CABINET PARTS 4-14 4-11 1-10 7-12 4-22 4-21 1-15 4-15 4-19 4-13 1-13 1-11 7-11 1-12 1-14 7-13 4-16 1-16 4-17 4-12 4-20 6-10 4-10 7-9 x 2...
  • Page 23 R-450B CONTROL PANEL PARTS 3-1B 3-1D 3-3-1 DOOR PARTS 4-18 3-3-3 7-10 3-3-2 7-10 MISCELLANEOUS Actual wire harness may be different from illustration.

  • Page 24: Packing And Accessories

    R-450B PACKING AND ACCESSORIES TOP PAD ASSEMBLY FPADBA317WRK0 DOOR PROTECTION SHEET SPADPA204WRE0 PLASTIC BAG SSAKHA032WRE0 6- 8 OPERATION MANUAL TURNTABLE TRAY BOTTOM PAD ASSEMBLY FPADBA318WRK0 6-10 TURNTABLE SUPPORT TRAY PACK INTO THE SPADFA389WRE0 OVEN CAVITY PACKING CASE SPAKCD108WRE0 Not replaceable items.

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