Jvc-XLSV-308-BU-Service-Manual电路原理图.pdf
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1、SERVICE MANUALVIDEO CD PLAYERContentsSafety precautions .1-2Preventing static electricity .1-3Disassembly .1-4Description of major IC .1-5XL-SV302SL/SV305GDXL-SV308BUPOWER 1 MIC VOLUME 2OPEN/CLOSERETURN1 MIC 212 3 4 5+10 678910/0ON / OFFMIN MAX MIN MAXCOMPACTDIGITAL VIDEOVIDEO CDG49G4dG50G4fG52G54G4
2、1G4eG54G50G4cG45G41G53G45G20G54G41G4bG45G20G4eG4fG54G45G20G42G45G46G4fG52G45G20G4fG52G44G45G52G49G4eG47G31G2e G4fG72G64G65G72G20G61G6cG6cG20G73G65G72G76G69G63G65G20G70G61G72G74G73G20G74G68G72G6fG75G67G68G20G4aG56G43G20G41G73G69G61G20G50G74G65G20G4cG74G64G2eG2dG20G43G75G73G74G6fG6dG65G72G20G53G61G74G
3、69G73G66G61G63G74G69G6fG6eG20G44G65G70G74G2eG32G2e G54G77G6fG20G6fG72G64G65G72G73G20G61G72G65G20G61G76G61G69G6cG61G62G6cG65G3aG20G49G6eG69G74G69G61G6cG20G6fG72G64G65G72G20G61G6eG64G20G6cG61G73G74G20G6fG72G64G65G72G20G28G42G65G66G6fG72G65G20G45G6eG64G20G4fG66G20G4cG69G6eG65G29G33G2e G4dG69G6eG69G6dG7
4、5G6dG20G6fG72G64G65G72G20G71G75G61G6eG74G69G74G79G3aG20G31G30G30G70G63G73G34G2e G44G65G6cG69G76G65G72G79G20G74G65G72G6dG3aG20G4dG69G6eG69G6dG75G6dG20G32G20G6dG6fG6eG74G68G73G20G75G70G6fG6eG20G63G6fG6eG66G69G72G6dG61G74G69G6fG6eG20G6fG66G20G6fG72G64G65G72G2eNo: 28207OCT. 2001COPYRIGHT 2001 VICTOR COM
5、PANY OF JAPAN LTD.XL-SV320SL/305GD/308BUXL-SV320SL/SV305GDXL-SV308BU1-2XL-SV320SL/305GD/308BU1. This design of this product contains special hardware and many circuits and components specially forsafety purposes. For continued protection, no changes should be made to the original design unlessauthor
6、ised in writing by the manufacturer. Replacement parts must be identical to those used in theoriginal circuits. Services should be performed by qualified personnel only.2. Alterations of the design or circuitry of the product should not be made. Any design alterations of theproduct should not be mad
7、e. Any design alterations or additions will void the manufacturers warrantyand will further relieve the manufacture of responsibility for personal injury or property damage resultingtherefrom.3. Many electrical and mechanical parts in the products have special safety-related characteristics.These ch
8、aracteristics are often not evident from visual inspection nor can the protection afforded bythem necessarily be obtained by using replacement components rated for higher voltage, the PartsList of Service Manual. Electrical components having such features are identified by shading on theschematics a
9、nd by ( ) on the Parts List in the Service Manual. The use of a substitute replacementwhich does not have the same safety characteristics as the recommended replacement parts shownin the Parts List of Service Manual may create shock, fire, or other hazards.4. The leads in the products are routed and
10、 dressed with ties, clamps, tubings, barriers and the like tobe separated from live parts, high temperature parts, moving parts and/or sharp edges for the preventionof electric shock and fire hazard. When service is required, the original lead routing and dress shouldbe observed, and it should be co
11、nfirmed that they have been returned to normal, after re-assembling.5. Leakage current check (Electrical Shock hazard testing)After re-assembling the product, always perform an isolation check on the exposed metal parts of theproduct (antenna terminals, knobs, metal cabinet, screw heads, headphone j
12、ack, control shafts, etc.)to be sure the product is safe to operate without danger of electrical shock.Do not use a line isolation transformer during this check. Plug the AC line cord directly into the AC outlet. Using a “Leakage Current Tester”, measure theleakage current from each exposed metal pa
13、rts of the cabinet, particularly and exposed metalpart having a return path to the chassis, to a known good earth ground. Any leakage current mustnot exceed 0.5mA AC (r.m.s.) Alternate check methodPlug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms pervolt or mo
14、re sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by aWarning1. This equipment has been designed and manufactured to meet international safety standards.2. It is the legal responsibility of the repairer to ensure that these safety standards are maintained.3. Repairs mus
15、t be made in accordance with the relevant safety standards.4. It is essential that safety critical components are replaced by approved parts.5. If mains voltage selector is provided, check setting for local voltage.0.15F AC-type capacitor between an exposedmetal part and a known good earth ground.Me
16、asure the AC voltage across the resistorwith the AC voltmeter.Move the resistor connection to each exposedmetal part, particularly any exposed metal parthaving a return path to the chassis, andmeasure the AC voltage across the resistor.Now, reverse the plug in the AC outlet andrepeat each measuremen
17、t. voltage measuredAny must not exceed 0.75 V AC (r.m.s.). Thiscorresponds to 0.5 mA AC (r.m.s.).Safety precautions0.15F AC TYPE1500 10WPlace thisprobe oneach exposedmetal part.Good earth groundAC Voltmeter(Having 1000ohms/volts,or more sensitivityXL-SV320SL/305GD/308BU1-3Preventing static electrici
18、tyElectrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is dis-charged, can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this whenperforming repairs.1.1. Grounding to prevent damage by static electricityStatic elec
19、tricity in the work area can destroy the optical pickup (laser diode) in devices such as DVD players.Be careful to use proper grounding in the area where repairs are being performed.1.1.1. Ground the workbench1. Ground the workbench by laying conductive material (such as a conductive sheet) or an ir
20、on plate overit before placing the traverse unit (optical pickup) on it.1.1.2. Ground yourself1. Use an anti-static wrist strap to release any static electricity built up in your body.1.1.3. Handling the optical pickup1. In order to maintain quality during transport and before installation, both sid
21、es of the laser diode on thereplacement optical pickup are shorted. After replacement, return the shorted parts to their originalcondition. (Refer to the text.)2. Do not use a tester to check the condition of the laser diode in the optical pickup. The testers internalpower source can easily destroy
22、the laser diode.1.2. Handling the traverse unit (optical pickup)1. Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.2. Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For spe-cific details, r
23、efer to the replacement procedure in the text. Remove the anti-static pin when replacing thetraverse unit. Be careful not to take too long a time when attaching it to the connector.3. Handle the flexible cable carefully as it may break when subjected to strong force.4. It is not possible to adjust t
24、he semi-fixed resistor that adjusts the laser power. Do not turn it.Conductive material(conductive sheet) oriron plate(caption)Anti-static wrist strapXL-SV320SL/SV305GDXL-SV308BU1-4XL-SV320SL/305GD/308BUDisassemblyProcedure of disassemblyNo. Description QTY. Action Remark1 Main part 1 Place2 Plane t
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