Jvc MXGC 5 Service Manual
This is the 68 pages manual for Jvc MXGC 5 Service Manual.
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Extracted text from Jvc MXGC 5 Service Manual (Ocr-read)
Page 1
Warning ! CAUTION Good earth ground Place this probe on each exposed metal part. AC VOLTMETER (Having 1000 ohms/v 1500 10W olts, or more sensitivity) 0.15 F AC TYPE Safety Precautions 1. This design of this product contains special hardware and many circui\ ts and components specially for safety purposes. For continued protection, no changes should be made to \ the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Services should be performed by qualified personnel o\ nly. 2. Alterations of the design or circuitry of the product should not be m\ ade. Any design alterations of the product should not be made. Any design alterations or additions will voi\ d the manufacturer's warranty and will further relieve the manufacture of responsibility for personal \ injury or property damage resulting therefrom. 3. Many electrical and mechanical parts in the products have special saf\ ety-related characteristics. These characteristics are often not evident from visual inspection nor can the\ protection afforded by them necessarily be obtained by using replacement components rated for higher\ voltage, wattage, etc. Replacement parts which have these special safety characteristics are id\ entified in the Parts List of Service Manual. Electrical components having such features are identifie\ d by shading on the schematics and by ( ! ) on the Parts List in the Service Manual. The use of a substitute re\ placement which does not have the same safety characteristics as the recommended r\ eplacement parts shown in the Parts List of Service Manual may create shock, fire, or other hazar\ ds. 4. The leads in the products are routed and dressed with ties, clamps, t\ ubings, barriers and the like to be separated from live parts, high temperature parts, moving parts and/or \ sharp edges for the prevention of electric shock and fire hazard. When service is required, the origina\ l lead routing and dress should be observed, and it should be confirmed that they have been returned to \ normal, after re-assembling. 5. Leakage currnet check (Electrical shock hazard testing) After re-assembling the product, always perform an isolation check on\ the exposed metal parts of the product (antenna terminals, knobs, metal cabinet, screw heads, headphon\ e jack, 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 Curr\ ent Tester", measure the leakage current from each exposed metal parts of the cabinet, particular\ ly any exposed metal part having a return path to the chassis, to a known good earth ground. Any l\ eakage current must not exceed 0.5mA AC (r.m.s.) Alternate check method Plug the AC line cord directly into the AC outlet. Use an AC voltmeter h\ aving, 1,000 ohms per volt or more sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a 0.15 F AC-type capacitor between an exposed metal part and a known good earth ground. Measure the AC voltage across the resistor with the AC voltmeter. Move the resistor connection to each exposed metal part, particularly any exposed metal part having a return path to the chassis, and meausre the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. Voltage measured Any must not exceed 0.75 V AC(r.m.s.). This corresponds to 0.5 mA AC(r.m.s.). 1. This equipment has been designed and manufactured to meet internation\ al safety standards. 2. It is the legal responsibility of the repairer to ensure that these \ safety standards are maintained. 3. Repairs must be made in accordance with the relevant safety standard\ s. 4. It is essential that safety critical components are replaced by appro\ ved parts. 5. If mains voltage selector is provided, check setting for local volta\ ge. Burrs formed during molding may be left over on some parts of the chassi\ s. Therefore, pay attention to such burrs in the case of preforming repair of this sys\ tem.
Page 2
Preventing static electricity 1. Grounding to prevent damage by static electricity Electrostatic discharge (ESD), which occurs when static electricity st\ ored in the body, fabric, etc. is discharged, can destroy the laser diode in the traverse unit (optical p\ ickup). Take care to prevent this when performing repairs. 2. About the earth processing for the destruction prevention by static e\ lectricity In the equipment which uses optical pick-up (laser diode), optical pic\ k-up is destroyed by the static electricity of the work environment. Be careful to use proper grounding in the area where repairs are being p\ erformed. 2-1 Ground the workbench Ground the workbench by laying conductive material (such as a conductiv\ e sheet) or an iron plate over it before placing the traverse unit (optical pickup) on it. 2-2 Ground yourself Use an anti-static wrist strap to release any static electricity built u\ p in your body. 3. Handling the optical pickup 1. In order to maintain quality during transport and before installatio\ n, both sides of the laser diode on the replacement optical pickup are shorted. After replacement, return the s\ horted parts to their original condition. (Refer to the text.) 2. Do not use a tester to check the condition of the laser diode in the\ optical pickup. The testers internal power source can easily destroy the laser diode. 4. Handling the CD changer unit (optical pickup) 1. Do not subject the CD changer unit (optical pickup) to strong shoc\ ks, as it is a sensitive, complex unit. 2. Cut off the shorted part of the flexible cable using nippers, etc. a\ fter replacing the optical pickup. For specific details, refer to the replacement procedure in the text. Remove the anti-static pin when replacing the CD changer 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 the semi-fixed resistor that adjusts the laser power. Do not turn it. Attention when traverse unit is decomposed * Please refer to Disassembly method in the text for pick up and how to detach the CD changer mechanism. 1. Remove the CD changer unit. 2. Disconnect the harness from connector on the CD motor board. 3. Solder is put up before the card wire is removed from connector Cn601on the main board as shown in Fig.A and Fig. B. (When the wire is removed without putting up solder, the CD pick-up assembly might destroy.) 4. Please remove solder after connecting the card wire with CN601 when you install picking up in the substrate. Conductive material (conductive sheet) or iron plate (caption) Anti-static wrist strap Soldering Fig.B Flexible cable Fig.A CD changer unit