Table of Contents
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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 ................................................................................................ 5
SERVICING ...................................................................................................................................................... 7
TEST PROCEDURE ......................................................................................................................................... 9
TOUCH CONTROL PANEL ............................................................................................................................. 16
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ........................................................... 21
MICROWAVE MEASUREMENT .................................................................................................................... 27
WIRING DIAGRAM ......................................................................................................................................... 28
PICTORIAL DIAGRAM ................................................................................................................................... 29
POWER UNIT CIRCUIT .................................................................................................................................. 30
CPU UNIT CIRCUIT ........................................................................................................................................ 31
PRINTED WIRING BOARD ............................................................................................................................. 33
PARTS LIST ................................................................................................................................................... 34
SERVICE MANUAL
SENSOR DEFROST
COOK
HELP
Info Displa y
HELP
Sensor Instan t Reheat
DINNER
CASSERO LE
PLATE
SOUP
PIZZA
RICE
PIE
Sensor Cook
VEGETA BLES
RICE / PASTA
MEAT
DESSE RTS
SLOW
EASY
COOK
DEFRO ST
LESS
MORE
POW ER
CLOC K
LEVE L
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-480C
MODELS
R-480C(K)
R-480C
R-480C(K)
S6903R480CPJ/
Page
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Table of Contents
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Summary of Contents for Sharp R-480C
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Page 1: Table Of Contents
R-480C R-480C(K) SERVICE MANUAL S6903R480CPJ/ MICROWAVE OVEN SENSOR DEFROST COOK HELP R-480C Info Displa y HELP MODELS Sensor Instan t Reheat DINNER CASSERO LE PLATE SOUP PIZZA RICE Sensor Cook VEGETA BLES RICE / PASTA R-480C(K) MEAT DESSE RTS SLOW... - Page 2 R-480C R-480C(K)
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Page 3: Caution Microwave Radiation
MICROWAVE OVEN APPEARANCE VIEW R-480C/ R-480C(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-480C R-480C(K) PRODUCT SPECIFICATIONS ITEM DESCRIPTION Power Requirements 230 - 240 Volts 50 Hertz Single phase, 3 wire earthed Power Consumption 1.6 kW Power Output 1100 watts nominal of RF microwave energy (IEC 705) Operating frequency 2450 MHz Case Dimensions... -
Page 5: Appearance View
R-480C R-480C(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
Figure O-1 on page 28 latch switch and stop switch must open their contacts 1. The display shows SHARP, MICRO-WAVE and OVEN. first. After that the contacts (COM-NC) of the monitor 2. To set any programs or set the clock, you must first switch can be closed. -
Page 7: Function Of Important Components
R-480C R-480C(K) 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 R-480C R-480C(K) FUNCTION OF IMPORTANT COMPONENTS DOOR OPEN MECHANISM will open at 145˚C, causing the oven to shut down. The defective thermal cut-out must be replaced with new one. The door can be opened by pushing the door open button on the control panel.
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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-480C R-480C(K) CK = Check / RE = Replace TEST PROCEDURE A B C D E E E E F G H H I I J K L M N O RE RECK CKCK CKCK CKCKCK P POSSIBLE CAUSE DEFECTIVE PARTS...
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Page 11: Test Procedure
R-480C R-480C(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 CHECKS. Isolate the magnetron from high voltage circuit by removing all leads connected to filament terminal. - Page 12 R-480C R-480C(K) TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Initial temperature ....................T1 = 11 C Temperature after (38 + 2) = 40sec..............T2 = 21 C Temperature difference Cold-Warm ..............T1 = 10 C Measured output power The equation is “P = 110 x T” ..........P = 110 x 10 C = 1100 Watts JUDGMENT: The measured output power should be at least 15 % of the rated output power.
- Page 13 R-480C R-480C(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-480C R-480C(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-480C R-480C(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-480C R-480C(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-480C R-480C(K) TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Water load cooking test Make sure the oven has been plugged in at least five 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.
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Page 18: Touch Control Panel
R-480C R-480C(K) 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. In addition, the... - Page 19 R-480C R-480C(K) LSI(IZA969DR) The I/O signal of the LSI(IZA969DR) is detailed in the following table. Pin No. Signal Description AN10 Signal coming from touch key. When either G10 line on key matrix is touched, a corresponding signal out of P10 - P17 will be input into AN10.
- Page 20 R-480C R-480C(K) Pin No. Signal Description Oven lamp, fan motor and turntable motor driving signal 20.0 msec. To turn on and off shut off relay (RY1). The square H : GND waveform voltage is delivered to the RY1 driving circuit and RY2 control circuit.
- Page 21 R-480C R-480C(K) Pin No. Signal Description Signal similar to AN10. When either G11 line on key matrix is touched, a corresponding signal will be input into AN9. ABSOLUTE HUMIDITY SENSOR CIRCUIT (1) Structure of Absolute Humidity Sensor With this voltage given, the switches SW1 to SW5 in...
- Page 22 R-480C R-480C(K) TOUCH CONTROL PANEL SERVICING 1. Precautions for Handling Electronic Components B. On some models, the power supply cord between the This unit uses CMOS LSI in the integral part of the touch control panel and the oven proper is long enough circuits.
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Page 23: 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, 1) Disconnect the power supply. - Page 24 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 25 R-480C R-480C(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 26 R-480C R-480C(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 27 R-480C R-480C(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 28 R-480C R-480C(K) 6. Re-install the latch spring to the latch head. Re-install the latch spring to the door frame. Re-install latch head Upper oven hinge to door frame. 7. Re-install choke cover to door panel by pushing. 8. Catch two (2) pins of door panel on two (2) hole of upper Door and lower oven hinges as shown Figure C-7.
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Page 29: Microwave Measurement
R-480C R-480C(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 30: Wiring Diagram
R-480C R-480C(K) SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. CLOCK APPEARS ON DISPLAY. NOTE: " " indicates components with potentials above 250V. MAGNETRON TEMPERATURE 2ND. LATCH FUSE SWITCH FUSE M10A COM. N.O. N.O. COM. RY-1 RY-2 H. V. FUSE CONTROL 0.75A... -
Page 31: Pictorial Diagram
R-480C R-480C(K) -
Page 32: Power Unit Circuit
R-480C R-480C(K) 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 OVEN LAMP TURNTABLE MOTOR FAN MOTOR Q3 KRC243M BUZZER R6 3.3k... -
Page 33: Cpu Unit Circuit
R-480C R-480C(K) SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 SEG16 SEG17 SEG18 SEG19 TEST OSC1 SEG20 OSC2 AVSS AN11 SEG35 AN10 4.7k C110 /25v 0.01 4.7k 330pF/50v (J16) (J17) 330pF/50v 4.7k 330pF/50v (J14) (J15) 330pF/50v 4.7k 330pF/50v /25v 0.01... - Page 34 R-480C R-480C(K) SENSOR DEFROST COOK HELP SEG9 SEG35 SEG8 SEG36 SEG7 SEG37 SEG6 SEG38 SEG5 SEG39 SEG4 COM16 SEG3 COM15 /50v SEG2 COM14 SEG1 COM13 C129 SEG0 COM12 COM7 COM11 COM6 COM10 COM5 COM9 COM4 COM8 COM3 COM2 COM1 COM0...
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Page 35: Printed Wiring Board
R-480C R-480C(K) (CN - C) CN - C CN - B CN - A (CN - D) (D10) Figure S-5. Printed Wiring Board... -
Page 36: Parts List
Varistor (10G471K) VHEHZ161///-1 Zenor diode (HZ16-1) 3- 2 DPWBFB965WRK0 CPU unit 3- 3 DPNLCB564WRK0 Control panel frame with key unit [R-480C] 3- 3 DPNLCB565WRK0 Control panel frame with key unit [R-480C(K)] 3- 3-1 FUNTKA948WRE0 Key unit [R-480C] 3- 3-1 FUNTKA949WRE0... - Page 37 Air guide 4-22 PCUSGA532WRP0 Cushion 4-23 PDUC-A661WRP0 AH sensor duct 4-24 PCUSGA531WRP0 Cushion DOOR PARTS CDORFA837WRK0 Door assembly [R-480C] CDORFA839WRK0 Door assembly [R-480C(K)] 5- 1 FDORFA290WRT0 Door panel 5- 2 HPNL-A692WRR0 Door screen 5- 3 GWAKPA641WRR0 Door frame [R-480C] 5- 3...
- Page 38 R-480C R-480C(K) OVEN AND CABINET PARTS 4-14 4-11 1-10 1-17 4-23 4-22 4-21 1-15 4-15 4-19 4-13 1-13 1-11 1-12 1-14 4-16 1-16 4-17 4-12 4-20 4-24 1-18 4-10...
- Page 39 R-480C R-480C(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.
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Page 40: Packing And Accessories
R-480C R-480C(K) TOP PAD ASSEMBLY PACKING AND ACCESSORIES FPADBA317WRK0 DOOR PROTECTION SHEET PLASTIC BAG SPADPA204WRE0 SSAKHA032WRE0 CABINET COVER for R-480C(K) SPAKHA010WRE0 6- 8 OPERATION MANUAL TURNTABLE TRAY BOTTOM PAD ASSEMBLY FPADBA318WRK0 6-4 TURNTABLE SUPPORT TRAY PACK INTO THE SPADFA389WRE0 OVEN CAVITY PACKING CASE SPAKCD260WRE0;...