Sharp R-380D Service Manual
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Sharp R-380D Service Manual

Sharp R-380D Service Manual

Microwave oven
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See also: User Manual
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
HELP
MODEL
SENSOR INSTANT REHEAT
DINNER
CASSERO LE
PLATE
SOUP
PIZZA
RICE
S E N S O R C O
O K
VEGET ABLES
RICE/P ASTA
MEA T
DESS ERTS
EXPR ESS
DEFR OST
EASY
DEFR OST
SLOW
COOK
LESS
1
2
3
4
6
7
8
9
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-380D
R-380D
S7006R380DPJ/
Page

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  • Page 1: Table Of Contents

    R-380D SERVICE MANUAL S7006R380DPJ/ MICROWAVE OVEN DEFROST COOK R-380D HELP Info Display HELP MODEL SENSOR INSTANT REHEAT DINNER CASSERO LE PLATE SOUP PIZZA RICE S E N S O R C O VEGET ABLES RICE/P ASTA MEA T DESS ERTS...
  • Page 2 R-380D...

  • Page 3: Caution Microwave Radiation

    MICROWAVE OVEN APPEARANCE VIEW R-380D 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-380D 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-380D 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

    1st. latch switch, 2nd. Figure O-1 on page 25 latch switch and stop switch must open their contacts 1. The display shows "SHARP MICRO-WAVE OVEN". first. 2. To set any programmes or set the clock, you must After that the contacts (COM-NC) of the monitor first touch the STOP/CLEAR pad.
  • Page 7 R-380D An example of how sensor works: 1. Potatoes at room temperature. Vapor is emitted very slowly. 2. Heat potatoes. Moisture and humidity is emitted rapidly. You can smell the aroma as it cooks. 3. Sensor detects moisture and humidity and calculates cooking time and variable power.

  • Page 8: Function Of Important Components

    R-380D 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 9: 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 10: Test Procedure

    R-380D CK = Check / RE = Replace TEST PROCEDURE A B C D E E E E G F H H I L M N O J K P RE CK CK RE CK CK CK CK CK POSSIBLE CAUSE...
  • Page 11 R-380D 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 12 R-380D 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 13 R-380D 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 14 R-380D 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 15: Touch Control Panel

    R-380D 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 16 R-380D 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 17 R-380D TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER (8) If the sensor has not detected the vapour of the food, ERROR will appear and the oven will shut off. Water load cooking test Make sure the oven has been plugged in at least five minutes before checking sensor cook operation.

  • Page 18: Touch Control Panel Assembly

    R-380D 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 19 R-380D Pin No. Signal Description AVSS Connected to VC. Key strobe signal. Signal applied to touch-key section. A pulse signal is input to AN9, AN10, AN11, P41 and P42 terminal while one of G8 line keys on key matrix is touched.
  • Page 20 R-380D Pin No. Signal Description Magnetron high-voltage circuit driving signal. To turn on and off the cook relay (RY2). The H : GND signals holds "L" level during microwave cooking HIGH and "H" level while not cooking. In other cooking L : -5V modes (variable cooking) the signal turns to "H"...
  • Page 21 R-380D ABSOLUTE HUMIDITY SENSOR CIRCUIT With this voltage given, the switches SW1 to SW5 in (1) Structure of Absolute Humidity Sensor the LSI are turned on in such a way as to change the The absolute humidity sensor includes two thermistors resistance values in parallel with R107 ~ R111 of IC2.
  • Page 22 R-380D 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 23: 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 24: Pictorial Diagram

    R-380D 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 25: Cpu Unit Circuit

    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 26 R-380D 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 27 R-380D 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 28 R-380D 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 29: Microwave Measurement

    R-380D 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 30 R-380D 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. COM. RY-1 RY-2 H.
  • Page 31 R-380D...
  • Page 32 R-380D CN-C 12PIN LEAD WIRE HARNESS Q2 2SB1238 R4 27 R5 4.7k D1-D4 11ES1 CN-A 1SS270A 1SS270A – – R3 510 1/2w Q1 2SB1238 R2 680 1/2w SP1 PKM22EPT Q3 KRC243M BUZZER R6 3.3k OVEN LAMP OVEN LAMP TURNTABLE TURNTABLE...
  • Page 33 R-380D...
  • Page 34 R-380D SENSOR DEFROST COOK HELP Figure S-4. Indicator Circuit...

  • Page 35: Printed Wiring Board

    R-380D (RED) (GREEN) CN - C SH - B SH - A B R1 (CN - B) (J2) (D10) (J1) CN - A Figure S-5. Printed Wiring Board...

  • Page 36: Parts List

    R-380D 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 37 R-380D ∆ 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 4-12 NCPL-A053WRFZ Coupling 4-13 PCUSUA511WRP0 Cushion 4-14 PCOVPA349WRE0 Waveguide cover...
  • Page 38 R-380D OVEN AND CABINET PARTS 4-13 4-25 4-24 4-18 1-18 1-10 1-11 4-17 4-21 4-16 1-13 4-26 4-11 4-25 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 39 R-380D CONTROL PANEL PARTS DOOR PARTS 5-11 3-3-1 5-10 5-10 MISCELLANEOUS Actual wire harness may be different from illustration.

  • Page 40: Packing And Accessories

    R-380D PACKING AND ACCESSORIES TOP PAD ASSEMBLY FPADBA428WRKZ DOOR PROTECTION SHEET SPADPA204WRE0 PLASTIC BAG SSAKHA034WRE0 6- 8 INSTRUCTION BOOK & PRINTING MATTER 6- 2 TURNTABLE TRAY BOTTOM PAD ASSEMBLY FPADBA429WRKZ 6- 1 TURNTABLE SUPPORT TRAY PACK INTO THE SPADFA451WRE0 OVEN CAVITY Not replaceable items.

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