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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 ...................................................................................................................................................... 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 ............................................................................................................................ 32
PARTS LIST .................................................................................................................................................... 33
SERVICE MANUAL
COOK
SENSOR
KG
DEF
HELP
HELP
Sensor Instant Reheat
DINNER
CASSEROLE SOUP
PLATE
PIZZA
RICE
PIE
Sensor Cook
MODEL
VEGETABL E
RICE/PAST
MEAT
DESSERTS
SLOW
EASY
COOK
MEMORY
DEFROST
LESS
MORE
1 2 3
4 5
6 7 8
9 O
POWER
CLOCK
LEVEL
TIMER
STOP
INSTANT COOK
CLEAR
START
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-380A
R-380A
S5703R380APJ/
Page
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Summary of Contents for Sharp R-380A
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Page 1: Table Of Contents
R-380A SERVICE MANUAL S5703R380APJ/ MICROWAVE OVEN COOK SENSOR HELP HELP Sensor Instant Reheat DINNER R-380A CASSEROLE SOUP PLATE PIZZA RICE Sensor Cook MODEL VEGETABL E RICE/PAST MEAT DESSERTS SLOW EASY COOK MEMORY DEFROST LESS MORE 1 2 3 6 7 8... - Page 2 R-380A...
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Page 3: Caution Microwave Radiation
MICROWAVE OVEN APPEARANCE VIEW R-380A 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-380A 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 fequency 2450 MHz Case Dimensions Width 520 mm... -
Page 5: Appearance View
R-380A 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 13 11.Wave guide cover... -
Page 6: Operation Sequence
1st. latch switch, 2nd. Figure O-1 on page 28 latch switch and stop switch must open their contacts 1. The display shows SHARP , MICRO- , WAVE first. OVEN . After that the contacts (COM-NC) of the monitor 2. -
Page 7: Function Of Important Components
R-380A An example of how sensor works: SENSOR INSTANT REHEAT. 2. The coil of shut-off relay (RY-1) is energized, the 1. Potatoes at room temperature. turntable motor, oven lamp and cooling fan motor are Vapor is emitted very slowly. turned on, but the power transformer is not turned on. - Page 8 R-380A NOISE FILTER 1. The high voltage rectifier is shorted by any causes when microwave cooking. The noise filter prevents the radio frequency interference 2. The peak reverse voltage of D2 of the rectifier goes that might flow back in the power circuit.
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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 R-380A CK = Check / RE = Replace TEST PROCEDURE A B C D E E E E G F H H I K L M N RE CK CK RE CK CKCK CK CK POSSIBLE CAUSE DEFECTIVE PARTS PROBLEM...
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Page 11: Test Procedure
R-380A 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-380A 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 13 R-380A TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER the reading obtained. Reverse the meter leads and note this second reading. If an open circuit is 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.
- Page 14 R-380A TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER this may be due to over heating produced by improper setting of the cooking time or failure of the control panel. 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.
- Page 15 R-380A TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER If incorrect readings are obtained, replace the noise filter unit. CARRY OUT 4R CHECKS. 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 16 R-380A TEST PROCEDURES PROCEDURE COMPONENT TEST 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 17 R-380A TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER permit adequate ventilation, be sure to install so as n ot to block these vents. There should be some space for air circulation. (5) Be sure the exterior of the cooking container and the interior of the oven are dry. Wipe off any moisture with a dry cloth or paper towel.
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Page 18: Touch Control Panel
R-380A TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER If the above is not the case, the control unit is probably defective. If the above is proper, the AH sensor is probably defective. Plunger R1,R2 : 22Ω ± 1% 1/2W R3 : 4.3kΩ ± 5% 1/4W R4 : 1MΩ... -
Page 19: Description Of Lsi
R-380A DESCRIPTION OF LSI LSI(IZA778DR): The I/O signal of the LSI(IZA778DR) is detailed in the following table. Pin No. Signal Description Terminal not used. Power source voltage input terminal. Standard voltage for LCD. AN7-AN4 Terminal to change cooking constant according to the Model. - Page 20 R-380A Pin No. Signal Description 36-37 P81-P80 Terminal not used. Internal clock oscillation frequency input setting. The internal clock frequency is set by inserting the ceramic filter oscillation circuit with respect to XIN terminal. XOUT Internal clock oscillation frequency control output.
- Page 21 R-380A Pin No. Signal Description AVSS Connected to VC. COM3 Common data signal: COM3. Connected to LCD (Pin No. C0) COM2 Common data signal: COM2. Connected to LCD (Pin No. C1) COM1 Common data signal: COM1. Connected to LCD (Pin No. C2) COM0 Common data signal: COM0.
- Page 22 R-380A SERVICING For those models, check and repair all the controls 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 circuits. When handling these parts, the following panel while keeping it connected to the oven.
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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, Chassis support and other metallic plate. - Page 24 R-380A 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 25 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-380A * Do not disfigure the bracket by touching with the 3) Install the fan blade to the shaft of fan motor by pushing pliers. the fan blade with a small, light weight, ball peen 2) Remove the fan blade from the shaft of the fan motor hammer or rubber mallet.
- Page 27 R-380A 1ST. LATCH SWITCH, 2ND. LATCH SWITCH, STOP SWITCH AND MONITOR SWITCH ADJUSTMENT latch hook, pushing and pulling lower portion of the 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-380A After any service, make sure of the following : 1. Door latch heads smoothly catch latch hook through latch holes and that latch head goes through center of latch hole. 2. Deviation of door alignment from horizontal line of cavity face plate is to be less than 1.0mm.
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Page 29: Microwave Measurement
R-380A 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: Wiring Diagram
R-380A 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 31 R-380A...
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Page 32: Power Unit Circuit
R-380A LD1 LD2 LD3 LD4 LD5 LD1-LD5 WH-1 R4 27 Q2 2SB1238 D1-D4 11ES1 R5 4.7k – – 2SB1238 R2 680 1/2w TURNTABLE R6 3.3k MOTOR OVEN LAMP MOTOR N.O. MICRO Q3 KRC243M SH-B 10µ/35v – SH-A : IF NOT SPECIFIED, 1/4w ± 5%... -
Page 33: Cpu Unit Circuit
R-380A... -
Page 34: Printed Wiring Board
R-380A WH-1 CN - C (C3) (D9) (CN - B) (R1) (J3) DOOR SW (J2) (ZD1) VRS1 (J1) (RY3) LOT NO. Figure S-4. Printed Wiring Board... -
Page 35: Parts List
R-380A 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-MA110WRE0 1st. latch switch, 2nd. latch switch and stop switch... - Page 36 R-380A ∆ 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- 4 LBNDKA099WRW0 Capacitor holder 4- 5 NFANJA029WRE0 Fan blade...
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Page 37: Oven And Cabinet Parts
R-380A OVEN AND CABINET PARTS 4-18 1-11 1-10 4-22 4-21 4-10 1-17 1-13 4-16 4-17 6-11 4-15 4-12 4-13 4-14 1-12 1-15 4-11 1-14 4-15 1-16... - Page 38 R-380A 3 - 7 CONTROL PANEL PARTS 3-1E 3 - 4 3 - 2 3 - 7 3 - 3 3 - 1 3-3-1 3 - 7 6 - 9 4-20 DOOR PARTS 3 - 5 3 - 6 5-10...
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Page 39: Packing And Accessories
R-380A TOP PAD ASSEMBLY PACKING AND ACCESSORIES FPADBA311WRK0 DOOR PROTECTION SHEET SPADPA204WRE0 PLASTIC BAG SSAKHA034WRE0 PRINTING MATTER 6- 2 TURNTABLE TRAY BOTTOM PAD ASSEMBLY FPADBA351WRK0 6- 1 TURNTABLE SUPPORT TRAY PACK INTO THE SPADFA397WRE0 OVEN CAVITY Not replaceable items. PACKING CASE... - Page 40 R-380A '97SHARP CORP. (5S0.730E) Printed in Australia...