Sharp R-310B Service Manual
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Sharp R-310B Service Manual

Sharp R-310B Service Manual

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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
CONTROL PANEL ........................................................................................................................................... 14
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ........................................................... 18
MICROWAVE MEASUREMENT .................................................................................................................... 24
WIRING DIAGRAM ......................................................................................................................................... 25
PICTORIAL DIAGRAM ................................................................................................................................... 26
CONTROL PANEL CIRCUIT ........................................................................................................................... 27
PRINTED WIRING BOARD ............................................................................................................................. 28
PARTS LIST ................................................................................................................................................... 29
SERVICE MANUAL
DEFROS T
MED
MED LOW
MED HIGH
LOW
HIGH
MODEL
2
3
1
4
5
6
0
7
8
9
10
30
11
25
20
12
0.5
13
15
14
DEFRO ST(kg)
1.0
DINN ER PLAT
E
MED
REHEA T 1 SERVE
(400g)
SOUP
5-6
min.
REHEA T 1 cup
HIGH
(250ml)
2-2
FRESH VEGET ABLES
1/2min.
COOK
HIGH
500g
DEFR OST
4-5
min.
Check chart in Operatio
n Manual
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-310B
R-310B
S7809R310BPJ/
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  • Page 1: Table Of Contents

    R-310B SERVICE MANUAL S7809R310BPJ/ MICROWAVE OVEN DEFROS T MED LOW MED HIGH R-310B HIGH MODEL DEFRO ST(kg) DINN ER PLAT REHEA T 1 SERVE (400g) SOUP min. REHEA T 1 cup HIGH (250ml) FRESH VEGET ABLES 1/2min. COOK HIGH 500g DEFR OST min.
  • Page 2 R-310B...

  • Page 3: Caution Microwave Radiation

    MICROWAVE OVEN APPEARANCE VIEW R-310B 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-310B 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-310B APPEARANCE VIEW 10 12 6. Door seals and sealing surfaces 11.Power supply cord 1. Ventilation openings 7. Coupling 12.Rating label 2. Oven lamp 8. Door open button 13.Turntable tray 3. Door hinges 9. Control panel 14.Turntable support 4. Door safety latches 10.Waveguide cover...

  • Page 6: Operation Sequence

    R-310B OPERATION SEQUENCE OFF CONDITION MONITOR SWITCH CIRCUIT The monitor switch is mechanically controlled by Closing the door activates all door interlock switches oven door, and monitors the operation of the 1st and (1st. latch switch, 2nd. latch switch and stop switch).

  • Page 7: Function Of Important Components

    R-310B 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

    3D checks and re-examine the connections to the screwdriver. 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 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-310B CK = Check / RE = Replace TEST PROCEDURE A B C D E E E E F G H H I J K L M RE CK CK RE CK CKCK CK CK POSSIBLE CAUSE DEFECTIVE PARTS PROBLEM...

  • Page 10: Test Procedure

    R-310B 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-310B 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 ±...
  • Page 12 R-310B TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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. When the asymmetric rectifier is defective, check whether magnetron, high voltage rectifier, high voltage wire or filament winding of the power transformer is shorted.
  • Page 13 R-310B TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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. The resistance of monitor resistor is approx. 0.8 ohms.
  • Page 14 R-310B TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER CONTROL PANEL ASSEMBLY TEST The control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore, unlike conventional microwave ovens, proper maintenance can not be performed with only a voltmeter and ohmmeter.
  • Page 15 R-310B TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER NOTE: *At the time of these repairs, make a visual inspection of the varistor for burn- ing damage and examine the trans- former with tester for the presence of layer short-circuit (check primary coil resistance).

  • Page 16: Control Panel

    R-310B CONTROL PANEL ASSEMBLY OUTLINE OF CONTROL PANEL Control Unit 5) Buzzer Circuit Control unit consists of LSI, power source circuit, synchro- The buzzer is responsive to signals from the LSI to emit nizing signal circuit, ACL circuit, buzzer circuit, encoder audible sounds (key touch sound and completion circuit, indicator circuit and potentiometer circuit.
  • Page 17 R-310B DESCRIPTION OF LSI LSI(IZA882DR) The I/O signal of the LSI(IZA882DR) are detailed in the following table. Pin No. Signal Description Auto clear terminal. Signal is input to reset the LSI to the initial state when power is applied. Temporarily set to "L"...
  • Page 18 R-310B Pin No. Signal Description Magnetron high-voltage circuit driving signal. ON/OFF time ratio in Micro cooking (a. 32second time base) To turn on and off the cook relay (RY2). In 100% POWER operation, the signals hold MICRO "L" level during microwave cooking and COOK "H"...
  • Page 19 R-310B SERVICING B. On some models, the power supply cord between 1. Precautions for Handling Electronic Components the touch control panel and the oven proper is so This unit uses CMOS LSI in the integral part of the long enough that they may be separated from 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-310B 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-310B 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-310B After adjustment, check the following. Door 1. In and out play of door remains less than 0.5mm when Latch Hook in the latched position. First check upper position of latch hook, pushing and pulling upper portion of door Latch toward the oven face.
  • Page 25 R-310B Note: After any service to the door; (A) Make sure that door sensing switch and secondary interlock switch are operating properly. (Refer to chapter “Test Procedures”.). (B) An approved microwave survey meter should be used to assure compliance with proper microwave radiation emission limitation standards.

  • Page 26: Microwave Measurement

    R-310B 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-310B 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-310B...

  • Page 29: Control Panel Circuit

    R-310B...

  • Page 30: Printed Wiring Board

    R-310B LD10 LD11 LD12 LD13 LD14 LD15 LD16 LD18 LD24 LD17 LD23 LD22 LD19 LD21 LD20 (JA) (JD) WH - A WH - A (J1) Figure S-3. Printed Wiring Board...

  • Page 31: Parts List

    R-310B 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-MA131WRE0 1st. latch switch, 2nd. latch switch and stop switch 1st.
  • Page 32 R-310B ∆ 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 VRD-B12EF301J Resistor 300 ohm 1/4W VRD-B12HF101J Resistor 100 ohm 1/2W...
  • Page 33 R-310B ∆ 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 6- 9 TSPCNC654WRR0 Rating label 6-10 PZET-A012WRE0 Terminal insulator...
  • Page 34 R-310B OVEN AND CABINET PARTS 4-18 1-11 1-10 4-10 1-13 4-16 4-17 4-15 4-12 4-13 4-14 1-12 1-15 4-11 1-14 4-15 1-16...
  • Page 35 R-310B CONTROL PANEL PARTS 3-10 3-10 3-10 DOOR PARTS 4-19 MISCELLANEOUS (CAPACITOR) 6-10 Actual wire harness may be different from illustration.
  • Page 36 R-310B '98SHARP CORP. (7S0.730E) Printed in Australia.

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