Instruction/ maintenance manual of the product R-520LK Sharp
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1 R- 520LK R-520L W In the interest of user-saf ety the o ven should be restored to its or iginal condition and only par ts identical to those specifi ed should be used.
2 R- 520LK R-520L W PRECA UTIONS T O BE OBSER VED BEFORE AND DURING SER VICING T O A V OID POSSIBLE EXPOSURE T O EXCESSIVE MICR O W A VE ENERGY (a) Do not operate or allow the o ven to be oper ated with the door open.
3 R- 520LK R-520L W W ARNING T O SER VICE PERSONNEL Microw av e o vens contain circuitry capab le of pro- ducing very high voltage and current, contact with f ollowing par ts ma y result in a se vere , possibly f atal, electr ical shock.
4 R- 520LK R-520L W MICR O W A VE MEASUREMENT PROCEDURE A. Requirements: 1) Micro wav e leakage limit (P ower density limit): The power density of microw av e radiation emitted by a microwa ve ov en s.
5 R- 520LK R-520L W SHARP ELECTRONICS CORPORA TION SHARP PLAZA, MAHW AH, NEW JERSEY 07430-2135 SER VICE MANU AL MICRO W A VE O VENS R-520LK/R-520L W FOREWORD This Manual has been prepared to provide Shar p Electronics Cor p . Service P ersonnel wi th Operation an d Ser vice Inf ormation f or the SHARP MICRO W A VE O VENS R-520LK and R-520L W .
6 R- 520LK R-520L W TOUCH CONTR OL P ANEL GENERAL INFORMA TION GROUNDING INSTR UCTIONS This ov en is equipped with a three prong g rounding plug. It must be plugged into a wall receptacle that is properly installed and grounded in accordance with the National Electrical Code and local codes and ordinances.
7 R- 520LK R-520L W 15 or 20 amp. fused electrical supply . It is recommended that a separate circuit serving only this appliance be pro vided. When installing this ap- pliance, observe all applicab le codes and ordinances. A shor t power-supply cord is provided to reduce r isks of becoming entangled in or tripping ov er a longer cord.
8 R- 520LK R-520L W OPERA TION DESCRIPTION OF OPERA TING SEQUENCE The f ollowing is a descr iption of component functions dur- ing ov en operation. OFF CONDITION Closing the door activ ates the door sensing switch and pri- mar y interlock switch. (In this condition, the monitor s witch contacts are opened.
9 R- 520LK R-520L W SENSOR COOKING CONDITION Using the SENSOR function, food is cook ed without figur- ing time, power le vel or quantity . When the oven senses enough steam from the food, it rela ys the inf or mation to its microprocessor which will calculate the remaining cooking time and pow er lev el needed f or best results.
10 R- 520LK R-520L W Figure O-2 Oven Schematic - Cooking Condition Figure O-1 Ov en Schematic - Off Condition SCHEMA TIC NO TE: CONDITION OF O VEN 1. Door Closed 2. CLOCK APPEARS ON DISPLA Y SCHEMA TIC 3. V ARIABLE COOKING CONTROL "HIGH" 2. COOKING TIME PROGRAMMED 1.
11 R- 520LK R-520L W DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM The door is opened by pushing the open button on the con - trol panel, ref er to the Figure D-1. When the open b utton is pushed, the open button pushes up the switch le ver , and then the s witch le ver pushes up the latch head.
12 R- 520LK R-520L W TR OUBLESHOO TING GUIDE Never touch any par t in the circuit with y our hand or an uninsulated tool while the power supply is con- nected. When troubleshooting the microw ave oven, it is helpful to follo w the Sequence of Operation in performing the checks.
13 R- 520LK R-520L W A MA GNETRON ASSEMBL Y TEST 1. Disconnect the pow er supply cord, and then remove outer case . 2. Open the door and bloc k it open.
14 R- 520LK R-520L W B PO WER TRANSFORMER TEST 1. Disconnect the power supply cord, and then remo ve outer case . 2. Open the door and bloc k it open. 3. Discharge high voltage capacitor . 4. Disconnect the primar y input ter minals and measure the resistance of the transformer with an ohmmeter .
15 R- 520LK R-520L W TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 1. Disconnect the pow er supply cord, and then remove outer case . 2. Open the door and bloc k it open. 3. Discharge high voltage capacitor . 4. If the capacitor is open, no high voltage will be av ailable to the magnetron.
16 R- 520LK R-520L W TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 1. Disconnect the pow er supply cord, and then remove outer case . 2. Open the door and bloc k it open. 3. Discharge high voltage capacitor . 4. Isolate the switch and connect the ohmmeter to the common (COM.
17 R- 520LK R-520L W TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST Therefore, unlike con ventional micro wave ovens, proper maintenance cannot be performed with only a v oltmeter and ohmmeter .
18 R- 520LK R-520L W 2. Control Unit The f ollowing symptoms indicate a defectiv e control unit. 2-1 In connection with pads . a) When touching the pads, a cer tain group of pads do not produce a signal. b) When touching the pads, no pads produce a signal.
19 R- 520LK R-520L W W ARNING : The o ven should be fully assemb led before f ollowing procedure . (1) Open the door . (2) Place one cup of water in the center of the turntable tra y in the ov en cavity (3) T ouch the " Defrost " pad once. (4) Press "2", then press "5".
20 R- 520LK R-520L W TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 1. F oil patter n check and repairs. 1) Disconnect the pow er supply cord, and then remove outer case . 2) Open the door and block it open. 3) Discharge high voltage capacitor . 4) Follo w the troubleshooting guide given belo w for repair .
21 R- 520LK R-520L W W ARNING : The ov en should be fully assembled bef ore following procedure . (1) The ov en should be plugged in at least two minutes bef ore sensor cooking. (2) Room temperature should not e xceed 95½F (35½C). (3) The unit should not be installed in an y area where heat and steam are generated.
22 R- 520LK R-520L W If new sensor dose not oper ate proper ly , the problem is with the control unit, and ref er to explanation belo w . CHECKING CONTROL UNIT (1) Disconnect the power supply cord, and then remo ve outer case. (2) Open the door and bloc k it open.
23 R- 520LK R-520L W 3) Po wer Source Cir cuit This circuit generates voltages necessar y in the control unit from the A C line voltage. In addition, the synchronizing signal is av ailable in order to compose a basic standard time in the clock circuit.
24 R- 520LK R-520L W Maximum output 70% of maximum output H : GND L : -5V H : GND L : -5V ON ON OFF OFF OFF 24 sec. 8 sec. 1-2 VL2-VL1 IN P ower sour ce voltage input terminal. Standard v oltage for LCD . 3-6 AN7-AN4 IN T erminal to change cooking input according to the Model.
25 R- 520LK R-520L W 25 P41 IN Signal similar to AN3. When either G11 line on k ey matr ix is touched, a corresponding signal will be input into P41. 26 P40 IN Connected to GND through the pull-down resistor . 27 RESET IN A uto clear terminal. Signal is input to reset the LSI to the initial state when pow er is applied.
26 R- 520LK R-520L W Connected to LCD . The relation between signals are as f ollows: LSI signal (Pin No .) LCD (Pin No .) LSI signal (Pin No .) LCD (Pin No .) SEG0 (72) .................................. SEG 0 SEG11 (61) .............................
27 R- 520LK R-520L W (1) Structure of Absolute Humidity Sensor The absolute humidity sensor includes tw o ther mistors as shown in the illustration. One ther mistor is housed in the closed v essel filled with dry air while another in the open vessel.
28 R- 520LK R-520L W 1. Precautions for Handling Electr onic Components This unit uses CMOS LSI in the integ ral par t of the circui ts. When handling these par ts, the follo wing precautions should be strictly f ollowed. CMOS LSI hav e e xtremely high impedance at its input and output ter minals.
29 R- 520LK R-520L W T o remove the outer case , proceed as follo ws. 1. Disconnect the power supply cord. 2. Open the ov en door and bloc k it open. 3. Remov e the two (2) screws from the lower por tion of the rear cabinet using a T20H T orx type or GTXH20-100 screw driv er .
30 R- 520LK R-520L W PO WER TRANSFORMER REMO V AL Re-install 1. Rest transf or mer on the bottom plate with its primar y ter minals tow ard the ov en face plate.
31 R- 520LK R-520L W POSITIVE LOCK ® CONNECT OR (NO-CASE TYPE) REMO V AL Figure C-2. P ositive lock ® connector 1. Disconnect the power supply cord, and then remov e outer case. 2. Open the door and bloc k it open. 3. Discharge high voltage capacitor .
32 R- 520LK R-520L W 2. Remov e tur ntable and tur ntable suppor t from oven cavity . 3. La y the ov en on it's backs ide. Remo ve the turntabl e motor cov er by snipping off the material in f our cor ners. 4. Where the cor ners hav e been snipped off bend cor ner areas flat.
33 R- 520LK R-520L W COOLING F AN MO T OR REMO V AL REMO V AL 1. Disconnect the power supply cord and then remov e outer case. 2. Open the door and bloc k it open. 3. Discharge high voltage capacitor . 4. Disconnect the wire leads from the f an motor .
34 R- 520LK R-520L W 3. Secure latch hook (with two (2) mounting screws) to ov en flange. 4 . Make sure that the monitor s witch is oper ating properly and check continuity of the monitor circuit. Ref er to chapter "T est Procedure" and Adjustment procedure.
35 R- 520LK R-520L W 9. Release the door panel from twelve (12) tabs of door frame. 10. Remov e the door panel from the door frame . 11. Now , door panel with sealer film is free. 12. T ear sealer film from door panel. 13. Now , door panel is free. 14.
36 R- 520LK R-520L W 6 4 5 1 2 3 6 4 5 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 CAPACITOR HIGH VOLTAGE WIRE A H.V. RECTIFIER HIGH VOLTAGE COMPONENTS OVEN LAMP AND SOCKET MAGNETRON COM. MONITOR SWITCH N.C. PRIMARY SWITCH TURNTABLE MOTOR POWER TRANSFORMER COM.
37 R- 520LK R-520L W 6 4 5 1 2 3 6 4 5 1 2 3 A B C D E F G H A B C D E F G H Figure S-3. Control Unit Cir cuit.
38 R- 520LK R-520L W 6 4 5 1 2 3 6 4 5 1 2 3 A B C D E F G H A B C D E F G H Figure S-5 . Printed Wiring Board of P ower Unit R Y1 R Y2 E C B E C B E C B VRS1 L1 D7 D3 P S D4 C2 D1 C1 D2 R8 R7 R2 R4 Q.
39 R- 520LK R-520L W REF . NO . P ART NO . § DESCRIPTION Q'TY CODE P AR TS LIST Note: The par ts marked “ ∆ ” may cause undue micr owave e xposure . The parts marked “*” are used in volta g e more than 250V . "§" MARK: P AR TS DELIVER Y SECTION.
40 R- 520LK R-520L W HO W T O ORDER REPLACEMENT P ARTS T o ha ve your order filled promptly and correctly , please fur nish the follo wing information. 1. MODEL NUMBER 2. REF . NO . 3. P ART NO . 4. DESCRIPTION Order P ar ts from the author ized SHARP par ts Distributor f or your area.
41 R- 520LK R-520L W 6 4 5 1 2 3 6 4 5 1 2 3 A B C D E F G H A B C D E F G H O VEN AND CABINET P ARTS 2-3 4-7 6-5 1-4 4-6 4-8 4-9 6-3 6-2 2-1 7-5 1-9 4-10 7-2 7-2 7-4 4-3 1-10 1-7 7-3 7-6 7-5 7-6 4-2 .
42 R- 520LK R-520L W 6 4 5 1 2 3 6 4 5 1 2 3 A B C D E F G H A B C D E F G H CONTROL P ANEL P ARTS DOOR P ARTS MISCELLANEOUS Actual wire harness may be different from illustration.
43 R- 520LK R-520L W P A CKING AND ACCESSORIES DOOR PROTECTION SHEET PLASTIC BAG PACKING CASE TOP PAD ASSEMBLY I N T O T H E O V E N C A V I T Y 6-3 TURNTABLE TRAY 6-6 OPERATION MANUAL BOTTOM PAD ASSE.
44 R- 520LK R-520L W 2006 SHARP CORP . (5M2.00E) Printed in U.S.A COPYRIGHT © 2006 BY SHARP CORPORA TION ALL RIGHTS RESER VED . No part of this pub lic atio n ma y be rep roduc ed, stored in retriev .
An important point after buying a device Sharp R-520LK (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Sharp R-520LK yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Sharp R-520LK - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Sharp R-520LK you will learn all the available features of the product, as well as information on its operation. The information that you get Sharp R-520LK will certainly help you make a decision on the purchase.
If you already are a holder of Sharp R-520LK, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Sharp R-520LK.
However, one of the most important roles played by the user manual is to help in solving problems with Sharp R-520LK. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Sharp R-520LK along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
