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Sharp R-480E Service Manual

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See also: Operation Manual and Cookbook
Se ns or
CAUTION, MICROWAVE RADIATION ............................................................................................................. 1
WARNING .......................................................................................................................................................... 1
PRODUCT SPECIFICATIONS ......................................................................................................................... 2
GENERAL INFORMATION ................................................................................................................................ 2
APPEARANCE VIEW ....................................................................................................................................... 3
OPERATION SEQUENCE ................................................................................................................................ 4
FUNCTION OF IMPORTANT COMPONENTS ................................................................................................ 6
SERVICING ...................................................................................................................................................... 7
TEST PROCEDURE ......................................................................................................................................... 9
TOUCH CONTROL PANEL ............................................................................................................................. 16
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ........................................................... 22
MICROWAVE MEASUREMENT .................................................................................................................... 28
WIRING DIAGRAM ......................................................................................................................................... 29
PICTORIAL DIAGRAM ................................................................................................................................... 30
POWER UNIT CIRCUIT .................................................................................................................................. 31
CPU UNIT CIRCUIT ........................................................................................................................................ 32
PRINTED WIRING BOARD ............................................................................................................................. 33
PARTS LIST ................................................................................................................................................... 34
SERVICE MANUAL
SENSOR DEFROST
COOK
HELP
Info Displa y
HELP
SENSOR INSTANT REHEAT
DINNER
CASSERO LE
PLATE
SOUP
PIZZA
RICE
PIE
S E N S O R C
O O K
MODELS
VEGET ABLES
RICE/ PASTA
MEAT
DESSE RTS
EXPRE SS
DEFRO ST
EASY
LESS
MORE
DEFRO ST
SLOW
QUICK &
COOK
EASY
1
2
3
4
5
6
7
8
9
0
POW EER
LEVE L
CLO CK
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
S7108R480EPJ/
MICROWAVE OVEN
R-480E
R-480E(K)
R-480E
R-480E(K)
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Summary of Contents for Sharp R-480E

  • Page 1: Table Of Contents

    R-480E R-480E(K) SERVICE MANUAL S7108R480EPJ/ MICROWAVE OVEN SENSOR DEFROST COOK HELP Info Displa y HELP SENSOR INSTANT REHEAT DINNER CASSERO LE PLATE SOUP R-480E PIZZA RICE S E N S O R C O O K MODELS VEGET ABLES RICE/ PASTA...
  • Page 2 R-480E R-480E(K)

  • Page 3: Caution Microwave Radiation

    MICROWAVE OVEN APPEARANCE VIEW R-480E/ R-480E(K) 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-480E R-480E(K) PRODUCT SPECIFICATIONS ITEM DESCRIPTION Power Requirements 230 - 240 Volts 50 Hertz Single phase, 3 wire earthed Power Consumption 1.65 kW Power Output 1150 watts nominal of RF microwave energy (IEC Test Procedure) Operating frequency 2450 MHz Case Dimensions...

  • Page 5: Appearance View

    R-480E R-480E(K) APPEARANCE VIEW 1. Ventilation openings 2. Oven lamp 3. Door hinges 4. Door safety latches 5. See through door 6. Door seals and sealing surfaces 7. Coupling 8. Door open button 9. Touch control panel 10.Digital readout 11.Waveguide cover 12.Power supply cord...

  • Page 6: Operation Sequence

    2nd. interlock relay control switch must open their Figure O-1 on page 28 contacts first. After that the contacts (COM-NC) of the 1. The display shows SHARP, MICRO-WAVE and OVEN. monitor switch can be closed. 2. To set any programs or set the clock, you must first 6-2.
  • Page 7 R-480E R-480E(K) 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-480E R-480E(K) FUNCTION OF IMPORTANT COMPONENTS DOOR OPEN MECHANISM HIGH VOLTAGE FUSE 0.75A The door can be opened by pushing the door open button The high voltage fuse blows when the high voltage rectifier on the control panel. When the door open button is or magnetron is shorted.

  • Page 9: 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...
  • Page 10 R-480E R-480E(K) CK = Check / RE = Replace TEST PROCEDURE A B C D E E F G H H I I J K L M N O RE RE CK CK CK CK CK CK CK CK P...

  • Page 11: Test Procedure

    R-480E R-480E(K) 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-480E R-480E(K) TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Room temperature ....To = 21˚C Initial temperature ....T1 = 11°C Temperature after (36 + 3) = 39 sec..............T2 = 21°C Temperature difference Cold-Warm .............. ∆T1 = 10°C Measured output power The equation is “P = 115 x ∆T”...
  • Page 13 R-480E R-480E(K) 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-480E R-480E(K) TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER CARRY OUT 4R CHECKS. Table: Thermal cut-out Test Temperature of "ON" Temperature of "OFF" Indication of ohmmeter Parts Name condition (closed circuit) (˚C) condition (open circuit) (˚C) (When room temperature is approx. 20˚C) Thermal cut-out 145˚C...
  • Page 15 R-480E R-480E(K) TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER units, Control Unit and Key Unit, and also the Control Unit is divided into two units, CPU Unit and Power Unit, and troubleshooting by unit replacement is described according to the symptoms indicated.
  • Page 16 R-480E R-480E(K) TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation. DC. voltage indicated ....Defective relay. DC. voltage not indicated ..Check diode which is connected to the relay coil. If diode is good, control unit is defective.
  • Page 17 R-480E R-480E(K) TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Make sure the oven has been plugged in at least two minutes before checking sensor cook operation. The cabinet should be installed and screws tightened. (1) Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup.

  • Page 18: Touch Control Panel

    R-480E R-480E(K) TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER (17) Reconnect the power supply cord after the outer case is installed. Run the oven and check all functions. (18) Carry out "Water load cooking test" again and ensure that the oven works properly.
  • Page 19 R-480E R-480E(K) LLSI The I/O signal of the LSI is detailed in the following table. Pin No. Signal Description COM5 Common data signal : COM11. Connected to LCD signal COM11. COM4 Common data signal : COM12. Connected to LCD signal COM12.
  • Page 20 R-480E R-480E(K) Pin No. Signal Description Key strobe signal. Signal applied to touch-key section. A pulse signal is input to AIN7, P14, P15, P16, P17 and AIN6 terminal while one of G4 line keys on key matrix is touched. Key strobe signal.
  • Page 21 R-480E R-480E(K) Pin No. Signal Description COM11 Common data signal : COM5. Connected to LCD signal COM5. COM12 Common data signal : COM4. Connected to LCD signal COM4. COM13 Common data signal : COM3. Connected to LCD signal COM3. COM14 Common data signal : COM2.
  • Page 22 R-480E R-480E(K) ABSOLUTE HUMIDITY SENSOR CIRCUIT (1) Structure of Absolute Humidity Sensor Then the LSI observes that voltage at AIN5 terminal The absolute humidity sensor includes two thermistors and compares it with its initial value, and when the as shown in the illustration. One thermistor is housed...
  • Page 23 R-480E R-480E(K) TOUCH CONTROL PANEL SERVICING 1. Precautions for Handling Electronic Components (sensor-related ones included) of the touch control This unit uses CMOS LSI in the integral part of the panel while keeping it connected to the oven. circuits. When handling these parts, the following B.

  • Page 24: 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 25 4. Where the portions have been snipped off bend portions plate left near by the turntable motor cover. This screw flat. No sharp edge must be evident after removal of the will be used at the following step 3. turntable motor cover.
  • Page 26 R-480E R-480E(K) OVEN LAMP AND LAMP SOCKET REMOVAL 9. Now, the oven lamp and lamp socket are free. 1. CARRY OUT 3D CHECKS. 2. Remove one (1) screw holding the chassis support to Oven lamp the magnetron and magnetron air duct.
  • Page 27 R-480E R-480E(K) 2. Install the fan motor to the back plate of the oven cavity 4. Connect the wire leads to the fan motor and magnetron, with the two (2) screws. referring to the pictorial diagram. 3. Re-install the fan duct to the oven cavity.
  • Page 28 R-480E R-480E(K) toward the oven face. Then check lower portion of the Door latch hook, pushing and pulling lower portion of the Latch Hook door toward the oven face. Both results (play in the door) should be less than 0.5mm.
  • Page 29 R-480E R-480E(K) door panel upward. 5. Hold the door panel to the door frame with three (3) Upper oven hinge screws. 6. Re-install the latch spring to the latch head. Re-install the latch spring to the door frame. Re-install latch head Door to door frame.

  • Page 30: Microwave Measurement

    R-480E R-480E(K) MICROWAVE MEASUREMENT Recommended instruments are: After adjustment of door latch switches, monitor switch NARDA 8100 and door are completed individually or collectively, the NARDA 8200 following leakage test must be performed with a survey HOLADAY HI 1500 instrument and it must be confirmed that the result meets...

  • Page 31: Wiring Diagram

    R-480E R-480E(K) SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. CLOCK APPEARS ON DISPLAY. NOTE: " " indicates components with potentials above 250V. THERMAL CUT-OUT 145˚C (MAGNETRON) FUSE M10A N.O. N.O. COM. COM. RY-2 RY-1 2ND. INTERLOCK RELAY H. V. FUSE 0.75A...

  • Page 32: Pictorial Diagram

    R-480E R-480E(K)

  • Page 33: Power Unit Circuit

    R-480E R-480E(K) CN-C 12PIN LEAD WIRE HARNESS Q2 2SB1238 R4 27 R5 4.7k CN-A D1-D4 11ES1 1SS270A 1SS270A – – R3 510 1/2w Q1 2SB1238 R2 680 1/2w SP1 PKM22EPT Q3 KRC243M BUZZER OVEN LAMP R6 3.3k TURNTABLE OVEN LAMP...

  • Page 34: Cpu Unit Circuit

    R-480E R-480E(K)

  • Page 35: Printed Wiring Board

    R-480E R-480E(K) (CN - C) CN - C CN - B CN - A (CN - D) (D10) Figure S-4. Printed Wiring Board...

  • Page 36: Parts List

    Varistor (10G471K) VHEHZ161///-1 Zenor diode (HZ16-1) 3- 2 DPWBFC193WRKZ CPU unit 3- 3 DPNLCB654WRKZ Control panel frame with key unit [R-480E] 3- 3 DPNLCB659WRKZ Control panel frame with key unit [R-480E(K)] 3- 3-1 FUNTKB070WREZ Key unit [R-480E] 3- 3-1 FUNTKB074WREZ...
  • Page 37 PCUSUA237WRP0 Cushion 4-20 PDUC-A778WRPZ AH sensor duct 4-21 PCUSGA531WRP0 Cushion 4-22 PCUSGA532WRP0 Cushion DOOR PARTS ∆ CDORFA927WRKZ Door assembly [R-480E] ∆ CDORFA928WRKZ Door assembly [R-480E(K)] ∆ 5- 1 FDORFA290WRT0 Door panel 5- 2 HPNL-A692WRR0 Door screen ∆ 5- 3 GWAKPA813WRRZ Door frame [R-480E] ∆...
  • Page 38 R-480E R-480E(K) OVEN AND CABINET PARTS 4-11 4-14 1-10 1-17 4-20 4-22 1-15 4-15 4-19 4-13 1-13 1-11 1-12 1-14 4-16 1-16 4-17 4-12 4-21 1-18 4-10...
  • Page 39 R-480E R-480E(K) CONTROL PANEL PARTS DOOR PARTS 3-3-1 4-18 3-3-3 3-3-2 MISCELLANEOUS Actual wire harness may be different from illustration.

  • Page 40: Packing And Accessories

    R-480E R-480E(K) PACKING AND ACCESSORIES TOP PAD ASSEMBLY FPADBA317WRK0 DOOR PROTECTION SHEET PLASTIC BAG SPADPA204WRE0 SSAKHA032WRE0 CABINET COVER for R-480E(K) SPAKHA010WRE0 FOAM SHEET SPAKHA013WREZ 6- 7 OPERATION MANUAL BOTTOM PAD ASSEMBLY FPADBA318WRK0 TURNTABLE TRAY 6-4 TURNTABLE SUPPORT TRAY PACK INTO THE...

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