Jvc-RCEZ-31-A-Service-Manual电路原理图.pdf
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1、SERVICE MANUALCD PORTABLE SYSTEMRC-EZ31ANo: 28225JAN. 2006COPYRIGHT 2006 JVC ASIA PTE LTDArea SuffixUS - AsiaUX - Middle EastA - AustraliaSERVICE POLICYNo service part is available for this model.Based on One to One exchange policy.ContentsSafety precaution .2Preventing static electricity .3Disassem
2、bly procedure.4Flow of function operation until TOC read .5Voltage charts .6Block diagram .8Wiring connection .9Schematic diagrams . 11Illustration of packing and parts list .18XL-SV320SL/SV305GDXL-SV308BU2RC-EZ311. This design of this product contains special hardware and many circuits and componen
3、ts specially forsafety purposes. For continued protection, no changes should be made ti the original design unlessauthorised in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Services should be performed by qualified personel only.2. Alterati
4、ons of the design or circuitry of the product should not be made. Any design alterations of the product should not be made. Any design alterations or additions will void the manufacturers warrantyand will further relieve the manufacturer of responsibility for personal injury or property damageresult
5、ing therefrom.3. Many eletrical and mechanical parts in the products have special safety-related characteristics.These characteristics are often not evident from visual inspection nor can the protection afforded bythem necessarily be obtain by using replaement components rated for higher voltage, th
6、e PartsList of Service manual. Electrical components having such features ate identified by the shading on the schematics and by ( ! ) on the parts List in the Service Manual. The use of a substituterepalcement which does not have the same safety characteristics as the recommended replacement parts
7、shown in the Parts List of Service manual may create shock, fire, or other hazards.4. The leads in the products are routed and dressed with ties, clamps, tubings, barriers and the like to be separated from live parts, high temperatures parts, moving parts and/or sharp edges for the prevention of ele
8、ctric shcok and fire hazard. When service is required, the original leat routing and dress should be observed, and it should be confirmed that they have been returned to normal, afterre-assembling.5. Leakage current check (Electrical Shock hazard testing)After re-assembling the product, always perfo
9、rm an isolation check on the exposed metap Parts of the product (antenna terminals, knobs, metal cabinet, screw heads, headphone jack, control shafts, etc.)to be sure the product is safe to operate without danger of electrical shock.Do not use a line isloation transformer during this check.Plug the
10、AC line cord directly into the AC outlet. Using a “Leakage Current Tester“, measure theleakage current from each ecposed metal parts 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.
11、s.)Alternate check methodPlug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms pervolt or more sensitvity in the following manner. Connect a 1,500 ohm 10W resistor paralleled by a0.15uF AC-type capacitor between an exposedmetal part and a known good earth ground.M
12、easure the AC voltage across the resistor withthe AC voltmeter.Move the resistor connection to each exposedmetal part, particularly and exposed metal parthaving a return path to te chassis andmeasure the AC voltage across the resistor. Now,reverse the plug in the AC outlet and repeateach measurement
13、. Voltage measured Any mustnot exceed 0.75 V AC (r.m.s.). This correspondsto 0.5 mA AC (r.m.s.).1. 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. repair
14、s must be made in accordance with the relevant safety standards.4. It is essential that safety critical components are replaced by approved parts.5. It mains voltage selector is provided, check setting for local voltage.CAUTION Burrs formed during moulding may be left over on some parts of the chass
15、is. Therefore,pay attention to such burrs in the case of performing repair of this system.Safety PrecautionsWarningRC-EZ313Preventing static electricityElectrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged,can destroy the laser diode in th
16、e traverse unit (optical pcikup). Take care to prevent this when performing repairs.1.1. Grounding to prevent damage by static electricityStatic electricity in the work area can destroy the optical pickup (laser diode) in devicessuch as DVD players.Be careful to use proper grounding in the area wher
17、e repairs are being performed.1.1.1. Gound the workbench1. Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate overit before placing the traverse unit (optical pickup) on it.1.1.2. Ground yourself1. Use an anti-static wrist starp to release and static ele
18、ctricity built up in your body.1.1.3. Handling the optical pcikup1. In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical pickup are storted. After replacement, return the shorted parts to their original condition.(Refer to th
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