Jvc-PCV-77-Service-Manual电路原理图.pdf
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1、t:l f- “1 f- et f- N CD P-t) (f) H Z h:J o , PC V 77 A BEG U V JVC pc-V77 AlB/E/G/UN Free service manuals Gratis schema s Digitized by IAWW. frceservicemanuals.info An instruction booklet (B /E/G version) is provided with this manual. Contents Page Safety Precautions . . . . 2 Location of Main Parts
2、 3 Removal of Main Parts . . . . 4 Adjustment . . . . . . . 7 Block Diagram . . 12 Wiring Connections . 14 Standard Schematic Diagram . . 15 Location of P.C. Board Parts and Parts List Tuner P.C. Board Parts . . 20 DIN Board . . 23 Page Main P.C. Boad parts . 24 DTS P.C. Board parts . . . 2B Explode
3、d View of Speaker Box and Parts List . 29 jQ Exploded View of Mechanism Assembly . 30 Mechanism Component Parts List . 31 ill Exploded View of Enclosure Assembly . 32 Enclosure Assembly Parts List . . 33 Im Packing and Packing Parts List . . 35 rrn Accessories . Back Cover No. 1740-1 October 1987 tJ
4、 PC-V77 A /B/E/G/UN f-. et f- . N (j) P-o t ;J M M Ul M :0 H () i t- Ul H Z hj o Safety Precautions 1. The design of this product contains special hardware. Many circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless a
5、uthorized in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Service should be per formed by qualified personnel only. 2. Alterations of the design or circuitry of the product should not be made. Any design alterations or additions will void t
6、he manufacturers warranty and will further relieve the manufacturer of responsibility for personal injury or pro perty damage resulting therefrom. 3. Many electrical and mechanical parts in the product have special safety-related characteristics. These characteri stics are often not evident from vis
7、ual 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 identified in the parts list of Service manual. Electrical components hav ing s
8、uch features are identified by (Lt) on the schematics and parts list in Service manual. The use of a substitute replacement which does not have the same safety characteristics as the recommended replacement part shown in the parts list in Service manual may create shock, fire, or other hazards. 4 .
9、The leads in the products are routed and dressed with ties, clamps, tubings, barriers and/or the like to be separated from live parts, high temperature part, mov ing parts and/or sharp edges for the prevention of elec tric shock and fire hazard. When service is required, the original lead routing an
10、d dress should be observed, and they should be confirm ed to be returned to normal, after re -assembling. 5. Leakage current check (Safety for electrical shock hazard) A fter re-assembling the product, always perform an isola tion check on the exposed metal parts of the Products (antenna terminals,
11、knobs, metal cabinet, screw heads, earphone jack, control shafts, etc.) to be sure the pro duct is safe to operate without danger of electrical shock. 2 (No. 1740) Do not use a line isolation transformer during this check. Plug the AC line cord directly into the AC outlet. Us ing a “ Leakage Current
12、 Tester“, measure the leakage current from each exposed metal part of the cabinet, particularly any exposed metal part having a return path to the chassis, to a known good earth ground (water pipe, etc.). Any leakage current must not ex ceed 0.5 mA AC (r.m.s.). Alternate check method. Plug the AC li
13、ne cord directly into the AC outlet. Use an AC voltmeter having 1,000 ohms per volt or more sensitivity in the following manner. Connect a 1500 l 10 W resistor paralleled by a 0.15 /LF AC-type capacitor between an exposed metal part and a known good earth ground (water pipe, etc.) Measure the AC vol
14、tage 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 measure the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. Any vo
15、ltage measured must not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5 mA AC (r .m .s.). AC VOLTMETER (HAVING 1000 ON, OR MORE SENSITIVITY I 0.1 5 /LF AC-TYPE GOOD EARTH GROUND PLACE THIS PROBE ON EACH EXPOSED METAL PART t:J C -cO C-et C-N (D P-t) j hj :0 M M (j) M :0 H n M S; t- (j) H Z hj 0 Lo
16、cation of Main Parts Main Board - Ass V Speaker Terminal Switch SEA Cover Power Transformer Fig . 2-1 AMP/SEA Board AssV CD Jack Assv INo. 1740) 3 PC-V77 A /B/E/G/UN Removal of Main Parts Cabinet Section Replacing the fuse Remove the rear cabinet the replace fuse Replacing the telescopic antenna. Re
17、move the screw at rear of the cabinet to replace the T . antenna. Rear cover 1) Remove the battery cover. 2) Remove eight screws G), and retaining the rear cabinet. 3) Disconnect the connector (CND 1) on Din Jack Board. (GN version) Amp. Board/SEA Board/3D speaker assy 1) Remove the two screws secur
18、ing the CD in-jack assy. 2) Remove the volume knob. 3) Remove the Function/Tape switch knob. 4) Pull and remove the SEA volume cover. 5) Remove the five screws and securing the board assy and 3D speaker assy. 6) Pull the entire assy slightly, then remove the head wire, motor tuner, etc. Tuner board
19、assy 1) Remove the wire connector for the tuner board. 2) Pull out the board ass y. Mechanism assy 1) Remove the six screws (j) . 2) Open the cassette door to remove . For reassembly, lift the cabinet rear slightly for easier assembly of the button and button lever. LeD indicator assy 1) Remove the
20、two screws 2) Remove the two screws 4 (No. 1740) securing the lamp assy. securing the LCD board. 7 Fig. 3-1 Fig. 3-2 Fig. 3-3 7 7 Fig. 3-4 hj :0 M M (j) M :0 H n M t- (j) H Z hj o Cassette door 1) Pull the lid up to remove. 2) Remove the door spring. 3) Close the door and remove the center shaft. Th
21、en remove the outer shaft and pull out toward the front panel. SEA board assy 1) Remove the two screws securing the pre-amp board. 2) Remove the four screws securing the SEA board. (For reassembly, insert the rec spring into the switchs slider hole.) The parts on the power amp board can still be rep
22、laced. Mechanism Section (Top View) (Bottom View) t-L -V / A /t;j / t:. / u /u/v Free se e manuals 3 Gralis schema s . -5 Digil izcd hy “ . frccscrviccmanuals.info Fig. 3-6 Motor bracket (Recording/playback deck) 1) Remove the three screws G). 2) Remove the chassis and M. bracket from the button sid
23、e. Then remove the bracket arm (panel). (The synchro arm can be removed from the pause lock. Return the pause lock after it is removed from the pro per position.) Head section 1) Remove the record/playback heads mounting screw and loosen screw . 2) Remove the erase head mounting screw and . Pinch ro
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