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Sharp R-3A88 Service Manual

Sharp R-3A88 Manual Online:

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Sharp R-3A88 User Manual
Sharp R-3A88 User Guide
Sharp R-3A88 Online Manual

Text of Sharp R-3A88 User Guide:

  • Sharp R-3A88, 29 R-3A88 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 * * * * ∆ ELECTRICAL PARTS 1- 1 QSW-MA110WRE0 1st. latch and 2nd. Iinterlock relay control switches 2 AK 1- 2 QSW-MA111WRE0 Monitor switch 1 AK 1- 3 RV-MZA197WRE0 Magnetron 1 BN 1- 4 RTHM-A080WRE0 Thermal cut-out 145˚C 2 AP 1- 5 FH-DZA047WRK0 High voltage rectifier assambly 1 AQ 1- 6 RC-QZA172WRE0 High voltage c

  • Sharp R-3A88, R-3A88 4 OPERATION SEQUENCE OFF CONDITION Closing the door activates all door interlock switches (1st. latch switch and 2nd. interlock relay control switch). IMPORTANT When the oven door is closed, the monitor switch contacts (COM-NC) must be open. When the microwave oven is plugged in a wall outlet, rated voltage is supplied to the point A3+A5 in the control unit. Figure O-1 on page 25 1. The display shows SHARP , MICRO- , WAVE and OVEN . 2. To set any programmes or set the clock, you must firs

  • Sharp R-3A88, R-3A88 12 TEST PROCEDURES (CONT'D) PROCEDURE LETTER COMPONENT TEST 2-2 In connection with indicators a) At a certain digit, all or some segments do not light up. b) At a certain digit, brightness is low. c) Only one indicator does not light. d) The corresponding segments of all digits do not light up; or they continue to light up. e) Wrong figure appears. f) A certain group of indicators do not light up. g) The figure of all digits flicker. 2-3 Other possible troubles caused by defective control unit. a) Buzzer does not sound or continues to sound. b) Clock does not operate properly. c) Cooking is not possible. K KEY UN

  • Sharp R-3A88, 18 R-3A88 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below before operating the oven. 1. Door does not close firmly. 2. Door hinge, support or latch hook is damaged. 3. The door gasket or seal or damaged. 4. The door is bent or warped. 5. There are defective parts in the door interlock system. 6. There are defective parts in the microwave generating and transmission assembly. 7. There is visible damage to the oven. Do not ope

  • R-3A88 11 PROCEDURE LETTER COMPONENT TEST TEST PROCEDURES (CONT'D) 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. If incorrect readings are obtained, replace the monitor resistor. CARRY OUT 4R CHECKS. G MONITOR

  • Sharp R-3A88, 26 R-3A88 6 45 1 2 3 6 45 1 2 3 A B C D E F G H A B C D E F G H Figure S-1. Pictorial Diagram HIGH VOLTAGE COMPONENTS OVEN LAMP  AND SOCKET COM. MONITOR SWITCH COM. N.O. N.C. 2ND INTERLOCK RELAY CONTROL SWITCH 1ST  LATCH SWITCH TURNTABLE MOTOR NOTE: Live (RED) wire must be connected to the terminal with blue mark on the oven light socket. CONTROL UNIT COM. NO LSI CN-B RY1 CN-G RY2 2 1 GRN GRY CN-A 1 2 3 4 5 WHT RED WHT RED GRY ORG BLK GRY GRN GRY WHT RED GRY BLK GRY BLKBLK THERMAL CUT-OUT (OVEN) FAN MOTOR RED BLK WHT GRY CN-B CN-A WHT WHT BLU BRN NEUTRAL LIVE GRN GRN 21 51 ORG GRY GRY WHT WHT THERMAL CUT-OUT (FAN) BLKRED

  • Sharp R-3A88, 32 R-3A88 6 45 1 2 3 6 45 1 2 3 A B C D E F G H A B C D E F G H OVEN AND CABINET PARTS 2-1 7-5 7-5 7-5 7-5 7-6 7-6 1-13 1-12 4-13 4-12 4-11 1-4 7-1 1-3 7-6 6-10 7-6 7-3 6-14 1-9 1-17 4-2 7-2 1-5 1-1 7-6 4-6 7-3 1-4 4-10 1-1 1-2 7-5 7-5 4-1 7-1 4-3 7-1 4-4 6-2 6-1 1-7 1-16 6-11 4-7 2-4 7-5 7-57-6 2-2 2-4 7-5 2-3 4-9 7-1 1-14 4-14 4-8 4-5 7-4 1-11 7-8 1-10 4-18 4-19 6-15 7-1 1-9 4-17 x2 1-15 7-3 7-1 4-15 4-16 1-8 7-2 7-7 A A 7-6 1-6 6-8

  • Sharp R-3A88, R-3A88 14 TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following units as shown in the touch control panel circuit. (1) Key Unit (2) Control Unit The principal functions of these units and the signals com- municated among them are explained below. Key Unit The key unit is composed of a matrix, signals generated in the LSI are sent to the key unit through R10, R11, R12, R13, R20, R21 and R22. When a key pad is touched, a signal is completed through the key unit an

  • Sharp R-3A88, R-3A88 6 SERVICING WARNING TO SERVICE PERSONNEL Microwave ovens contain circuitry capable of producing very high voltage and current, contact with any part of the high voltage circuit will result in electrocution. High voltage capacitor, Power transformer, Magnetron, High voltage rectifier assembly, High voltage harness. REMEMBER TO CHECK 3D 1) Disconnect the supply. 2) Door opened, and wedged open. 3) Discharge high voltage capacitor. WARNING: AGAINST THE CHARGE OF THE HIGH-VOLTAGE CAPACITOR The high-voltage capacitor remains charged about 60 seconds after the oven has been switched off. Wait for 60 seconds and then short-circuit the con- nection of the

  • Sharp R-3A88, R-3A88 7 MAGNETRON POWER TRANSFORMER H.V. RECTIFIER ASSEMBLY HIGH VOLTAGE CAPACITOR 1ST. LATCH SWITCH 2ND. INTERLOCK RELAY CONTROL SWITCH MONITOR SWITCH MONITOR RESISTOR THERMAL CUT-OUT 95˚C THERMAL CUT-OUT 145˚C FAN MOTOR TURNTABLE MOTOR FUSE M8A TOUCH CONTROL PANEL KEY UNIT RELAY (RY-1, RY-2) FOIL PATTERN ON P.W.B. POWER SUPPLY CORD SHORTED WIRE HARNESS OPENED WIRE HARNESS OVEN LAMP OR SOCKET WALL OUTLET MISADJUSTMENT SWITCH HOME FUSE OR BREAKER BLOCKED COOLING FAN BLOCKED VENTILATION Home fuse blows when power supply cord is plugged into wall outlet. FUSE M8A blows when power supply cord is plugged into wall outlet. Display does not sh

  • Sharp R-3A88, R-3A88 9 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 6. Measure the final water temperature. (Example: The final temperature T2 = 21°C) 7. Calculate the microwave power output P in watts from above formula. Initial temperature .................................................................................................. T1 = 11°C Temperature after (49 + 2) = 51 sec. ..................................................................... T2 = 21°C Temperature difference Cold-Warm....................................................................

  • Sharp R-3A88, 33 R-3A88 6 45 1 2 3 6 45 1 2 3 A B C D E F G H A B C D E F G H DOOR PARTS CONTROL PANEL PARTS 3- 1 3-2-1 3- 3 3- 4 3- 2 3- 5 Actual wire harness may be different from illustration. 6-4 6-12 6-7 6-5 6-6 5-4 5-1 5-2 5-3 5-6 5-7 5-5 MISCELLANEOUS

  • Sharp R-3A88, R-3A88 10 TEST PROCEDURES (CONT'D) PROCEDURE LETTER COMPONENT TEST B C HIGH VOLTAGE RECTIFIER CARRY OUT 4R CHECKS. NOTE: FOR MEASUREMENT OF THE RESISTANCE OF THE RECTIFIER, THE BATTERIES OF THE MEASURING INSTRUMENT MUST HAVE A VOLTAGE AT LEAST 6 VOLTS, BECAUSE OTHERWISE AN INFINITE RESISTANCE MIGHT BE SHOWN IN BOTH DIRECTIONS. D 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. C. A normal capacitor shows continuity

  • Sharp R-3A88, 24 R-3A88 MICROWAVE MEASUREMENT After adjustment of door latch switches, monitor switch and door are completed individually or collectively, the following leakage test must be performed with a survey instrument and it must be confirmed that the result meets the requirements of the performance standard for micro- wave oven. REQUIREMENT The safety switch must prevent microwave radiation emis- sion in excess of 5mW/cm2 at any point 5cm or more from external surface of the oven. PREPARATION FOR TESTING: Before beginning the actual test for leakage, proceed as follows; 1. Make sure that the test instrument is operating normally as specified in its ins

  • R-3A88 3 APPEARANCE VIEW TOUCH CONTROL PANEL a HELP PAD Touch to select child lock, language or demonstration modes. Touch to get cooking information. b REHEAT PAD Touch to reheat 3 popular menus. c RICE COOK PAD Touch to cook rice, congee or porridge. d STEAM MENU PAD Touch to cook steam menus. e. INTERNATIONAL MENUE OADS Touch to cook 3 international menus. f SLOW COOK PAD

  • Sharp R-3A88, R-3A88 13 TEST PROCEDURES (CONT'D) PROCEDURE LETTER COMPONENT TEST RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS RY1 APPROX. 25.0V D.C. Oven lamp / Turntable motor / Cooling fan motor RY2 APPROX. 25.0V D.C. Power transformer CARRY OUT 4R CHECKS. N PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD (PWB) IS OPEN To protect the electronic circuits, this model is provided with a fine foil pattern added to the primary on the PWB, this foil pattern acts as a fuse. If the foil pattern is open, follow the

  • Sharp R-3A88, 20 R-3A88 Coil Gap Rotor Bracket Stator Groove joint pliers Shaft Axis Stator These are the position where should be pinched with pliers Rotor Side ViewRear View Shaft Table Center of bracket COOLING FAN MOTOR REMOVAL 1. CARRY OUT 3D CHECKS. 2. Disconnect the wire leads from the fan motor, thermal cut-out (FAN) and magnetron. 3. Remove two (2) screws holding the chassis support to oven cavity front plate and magnetron. And remove chassis support. 4. Remove two (2) screws holding the magnetron to waveguide flange. And remove the magnetron. 5. Remove one (1) screw holding the fan duct assembly to oven cavity. 6. Release the fan duct assembly from the oven ca

  • Sharp R-3A88, R-3A88 15 DESCRIPTION OF LSI LSI(IZA683DR) The I/O signal of the LSI(IZA683DR) are detailed in the following table. Pin No. Signal I/O Description 1 Vdisp IN Anode (segment) of Fluorescent Display light-up voltage: -34V Vp voltage of power source circuit input. 2 R00 IN Signal coming from touch key. When either one of G12 line keys on key matrix is touched, a corresponding signal out of R10 - R13, R20, R21 and R22 will be input into R00. When no key is touched, the signal is held at "L" level. 3 R01 IN Signal com

  • 19 R-3A88 plate right. 4. Remove transformer from bottom plate right. 5. Remove the one (1) terminal insulator from filament lead (longer one) of power transformer. Re-install 1. Insert tube into filament lead (longer one) of power transformer. 2. Install the terminal insulator to receptacle of filament lead (longer one) of power transformer. 3. Rest transformer on the bottom plate right with its

  • R-3A88 17 SERVICING 1. Precautions for Handling Electronic Components This unit uses CMOS LSI in the integral part of the circuits. When handling these parts, the following precautions should be strictly followed. CMOS LSI have extremely high imped- ance at its input and output terminals. For this reason, it is easily influenced by the surrounding high voltage power source, s

  • Sharp R-3A88, 31 R-3A88 HOW TO ORDER REPLACEMENT PARTS To have your order filled prompty and correctly, please furnish the following information. 1. MODEL NUMBER 2. REF. NO. 3. PART NO. 4. DESCRIPTION DOOR PROTECTION SHEET SPADPA204WRE0 TOP PAD ASSEMBLY FPADBA311WRK0 PLASTIC BAG SSAKHA034WRE0 Not replaceable items. PACKING CASE SPAKCC767 WRE0 BOTTOM PAD ASSEMBLY FPADBA312WRK0 TURNTABLE TRAY OPERATION MANUAL (ENGLISH) OPERATION MANUAL (THAI) ROLLER STAY GLASS COOK WARE TRAY PAD INTO THE OVEN CAVITY WARRANTY CARD MENU LABEL COOK BOOK VIDEO TAPE TRAY HOLDER SPAD

  • Sharp R-3A88, R-3A88 SHARP CORPORATION SERVICE 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. MODEL R-3A88 S3614R3A88PX/ MICROWAVE OVEN TABLE OF CONTENTS Page CAUTION, MICROWAVE RADIATION................................................................................................................. 1 WARNING .............................................................................................................................................................. 1 PRODUCT SPECIFICATIONS ......................................

  • Sharp R-3A88, 30 R-3A88 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 * ∆ ∆ ∆ ∆ ∆ (J35) VRD-B12EF511J Resistor 510 ohm 1/4W 1 AA RY1 RRLY-A080DRE0 Relay (OJ-SS-124LM) 1 AG RY2 RRLY-A076DRE0 Relay (OMIF-S-124LM) 1 AK SP40 RALM-A014DRE0 Buzzer (PKM22EPT-THAI) 1 AG T1 RTRNPA098DRE0 Transformer 1 AT VRS1 RH-VZA032DRE0 Varistor (10G471K) 1 AE ZD2 VHEHZ4C3///-1 Zener diode (HZ4C-3) 1 AA 3- 2 FPNLCB225WRK0 Control panel frame with key unit 1 AZ 3- 2-1 FUNTKA753WRE0 Key unit 1 AV 3- 3 JBTN-A927WRF0 Open button 1 AF 3- 4 MSPRCA050WRE0 Open button spr

  • Sharp R-3A88, 25 R-3A88 SCHEMATIC NOTE: CONDITION OF OVEN 1.DOOR CLOSED 2.CLOCK APPEARS ON DISPLAY NOTE: " " indicates components with potentials above 250V. Figure O-1. Oven Schematic-OFF Condition Figure O-2. Oven Schematic-Cooking Condition SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED 2. COOKING TIME PROGRAMMED 3. START KEY TOUCHED POWER TRANSFORMER MAGNETRON H.V. RECTIFIER CAPACITOR 1.07µ AC2100V TURNTABLE MOTOR FAN MOTOR OVEN LAMP MONITOR SWITCH CONTROL UNIT THERMAL CUT-OUT 145˚(MG) THERMAL CUT-OUT 95˚C (FAN) 1ST. LATCH SWITCH B1 B2 A5 A3 EARTH BLU BRN 220 V ˜ 50Hz OL FM TTM N.O. RY-1 G-Y COM. FUSE M8A A1 THERMAL CUT-OUT 1

  • Sharp R-3A88, R-3A88 16 Pin No. Signal I/O Description 25 BUZZ OUT Signal to sound buzzer. A: key touch sound (0.12 sec.). B: Completion sound (2.4 sec.). 26-27 D4-D5 OUT Segment data signal. Refer to the touch control panel circuit for the relationship between signals and indicators. Normally, one pulse is output in every synchronized signal period, and input to the anode of the fluorescent display. 28 D6 OUT Segment data signal. Signal similar to P41. Key strobe signal. Signal applied to touch-key section. A pulse signal is input to R00-R03 terminal while one of G8 line keys on key matrix is touched. 29-30 D7-D8 OUT Dig

  • 22 R-3A88 should be less than 0.5mm. The vertical position of the latch hook should be adjusted so that the 1st. latch switch 2nd. interlock relay control switch are activated with the door closed. The horizontal position of the latch hook should be adjusted so that the monitor switch is activated with the door closed. 3. Secure the screws with washers firmly. 4. Check the operat

  • Sharp R-3A88, 23 R-3A88 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. 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. 3. Door is positioned with its face pressed towar

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