Jvc-HXGX-7-Service-Manual 电路图 维修手册.pdf

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1、SERVICE MANUAL COPYRIGHT 2004 VICTOR COMPANY OF JAPAN, LIMITED No.MB161 2004/3 COMPACT COMPONENT SYSTEM MB16120043 HX-GX7 TABLE OF CONTENTS 1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2、 2SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 3DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-

3、7 4ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-37 5TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4、. . . . 1-41 Area suffix J - U.S.A. C - Canada CA-HXGX7SP-HXGX7SP-HXGX7 RadioFans.CN 收音机爱 好者资料库 1-2 (No.MB161) SPECIFICATION Design and specifications are subject to change without notice. Amplifier section-CA-HXGX7 Output Power SUBWOOFERS180 W per channel, min. RMS, driven into 6 at 63 Hz with no m

5、ore than 10 %total harmonic distortion. MAIN SPEAKERS80 W per channel, min. RMS, driven into 6 at 1 kHz with no more than 10 %total harmonic distortion. Audio input sensitivity/impedance (Measured at 1 kHz, with tape recording signal 300 mV) AUX300 mV/47 k Speakers/impedanceSUBWOOFERS6 - 16 MAIN SPE

6、AKERS 6 - 16 Tuner FM tuning range87.5 MHz - 108.0 MHz AM tuning range530 kHz - 1 710 kHz CD player CD capacity5 discs Dynamic range87 dB Signal-to-noise ratio90 dB Wow and flutterImmeasurable MP3 recording formatMPEG 1/2 Audio Layer 3 Max. Bit rate320 kbps Cassette deck Frequency responseNormal (ty

7、pe I)50 Hz - 14 000 Hz Wow and flutter0.15 % (WRMS) General Power requirementAC 120 V , 60 Hz Power consumption245 W/310 VA (at operation) 26 W (on standby) Dimensions (approx.)205 mm 370 mm 432 mm (W/H/D) (8 1/8 in. 14 5/8 in. 17 1/0 16 in.) Mass (approx.)10.5 kg (23.2 lbs) Speaker section-SP-HXGX7

8、 Type3-Way 4-Speaker Bass-Reflex Type Speaker SystemsSubwoofer16 cm (6 5/16 in.) cone 1 Woofer12 cm (4 3/4 in.) cone 2 Tweeter5 cm (2 in.) cone 1 Power handling capacity Subwoofer360 (180 + 180) W Main speaker160 (80 + 80) W ImpedanceSubwoofer6 Main speaker6 Frequency rangeSubwoofer27 Hz - 1000 Hz M

9、ain speaker70 Hz - 25 000 Hz Sound pressure levelSubwoofer78 dB/Wm Main speaker88 dB/Wm Dimensions (approx.)227 mm 432 mm 376 mm (W/H/D) (8 15/16 in. 17 1/16 in. 14 13/16 in.) Mass (approx.)8 kg (17.7 lbs) each RadioFans.CN 收音机爱 好者资料库 (No.MB161)1-3 SECTION 1 PRECAUTION 1.1Safety Precautions (1) This

10、 design of this product contains special hardware and many circuits and components specially for safety purpos- es. 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 or

11、iginal circuits. Services 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 of the product should not be made. Any design alterations or additions will void the manufacturers warranty and will furth

12、er relieve the manufacture of responsibility for personal injury or property damage resulting therefrom. (3) Many electrical and mechanical parts in the products have special safety-related characteristics. These characteris- tics are often not evident from visual inspection nor can the protection a

13、fforded by them necessarily be obtained by us- ing replacement components rated for higher voltage, watt- age, etc. Replacement parts which have these special safety characteristics are identified in the Parts List of Ser- vice Manual. Electrical components having such features are identified by sha

14、ding on the schematics and by ( ) on the Parts List in the Service Manual. The use of a substitute replacement which does not have the same safety charac- teristics as the recommended replacement parts shown in the Parts List of Service Manual may create shock, fire, or other hazards. (4) The leads

15、in the products are routed and dressed with ties, clamps, tubings, 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 original lead routing and dress should

16、 be observed, and it should be confirmed that they have been returned to normal, after reassem- bling. (5) Leakage shock hazard testing After reassembling the product, always perform an isola- tion check on the exposed metal parts of the product (an- tenna terminals, knobs, metal cabinet, screw head

17、s, headphone 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 Current Tester, measure the leakage current from each ex

18、posed 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 leakage cur- rent 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 having, 1,

19、000 per volt or more sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a 0.15F AC-type capacitor between an ex- posed 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

20、 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. Voltage measured any must not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.). 1

21、.2Warning (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) Repairs must be made in accordance with the relevant safety standards. (4) It is essent

22、ial that safety critical components are replaced by approved parts. (5) If mains voltage selector is provided, check setting for local voltage. 1.3Caution Burrs formed during molding may be left over on some parts of the chassis. Therefore, pay attention to such burrs in the case of pre- forming rep

23、air of this system. 1.4Critical parts for safety In regard with component parts appearing on the silk-screen printed side (parts side) of the PWB diagrams, the parts that are printed over with black such as the resistor ( ), diode ( ) and ICP ( ) or identified by the mark nearby are critical for saf

24、ety. When replacing them, be sure to use the parts of the same type and rating as specified by the manufacturer. (This regulation dose not Except the J and C version) Good earth ground Place this probe on each exposed metal part. AC VOLTMETER (Having 1000 ohms/volts, or more sensitivity) 1500 10W 0.

25、15 F AC TYPE RadioFans.CN 收音机爱 好者资料库 1-4 (No.MB161) 1.5Preventing static electricity Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when p

26、erforming repairs. 1.5.1 Grounding to prevent damage by static electricity Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as laser products. Be careful to use proper grounding in the area where repairs are being performed. (1) Ground the workbench Gr

27、ound the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the traverse unit (optical pickup) on it. (2) Ground yourself Use an anti-static wrist strap to release any static electricity built up in your body. (3) Handling the optical pickup

28、In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical pickup are shorted. After replacement, return the shorted parts to their original condition. (Refer to the text.) Do not use a tester to check the condition of the laser di

29、ode in the optical pickup. The testers internal power source can easily destroy the laser diode. 1.6Handling 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 cab

30、le using nippers, etc. after replacing the optical pickup. For specific details, refer to the replacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long a time when attaching it to the connector. (3) Handle the flexible cable caref

31、ully as it may break when subjected to strong force. (4) I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it. 1.7Attention when traverse unit is decomposed *Please refer to Disassembly method in the text for the pickup unit. Apply solder to the short la

32、nd sections before the flexible wire is disconnected from the connecto on the servo board. (If the flexible wire is disconnected without applying solder, the pickup may be destroyed by static electricity.) In the assembly, be sure to remove solder from the short land sections after connecting the fl

33、exible wire. 1M Conductive material (conductive sheet) or iron palate (caption) Anti-static wrist strap Pickup Flexible board Short round Card wire (No.MB161)1-5 1.8Importance administering point on the safety Caution: For continued protection against risk of fire, replace only with same type 6.3 A/

34、125 V for F001, 8 A/125 V for F101 and F102, 3.15 A/125 V for F104. This symbol specifies type of fast operating fuse. Precaution: Pour eviter risques de feux, remplacez le fusible de surete de F001 comme le meme type que 6,3 A/125 V, 8 A/125 V pour F101 et F102, et 3.15 A/125 V pour F104. Ce sont d

35、es fusibles suretes qui functionnes rapide. 8A-125V F102 8A-125V F101 3.15A-125V F104 6.3A-125V F001 1-6 (No.MB161) SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS. (No.MB161)1-7 SECTION 3 DISASSEMBLY 3.1Main body section 3.1.1Removing the

36、metal cover (See Figs.1 to 3) (1) From the back side of the main body, remove the six screws A attaching the metal cover. (See Fig.1.) (2) From the both sides of the main body, remove the two screws B attaching the metal cover. (See Figs.2 and 3.) (3) Remove the metal cover from the main body while

37、lifting the rear section of the metal cover in the direction of the ar- row. (See Figs.2 and 3.) Fig.1 Fig.2 Fig.3 Metal cover A A A Metal cover B Metal cover B 1-8 (No.MB161) 3.1.2Removing the front panel assembly (See Figs.4 to 7) Prior to performing the following procedures, remove the metal cove

38、r. (1) From the right side of the main body, disconnect the card wires from the connectors (CN43, CN44, CN802, CN803) on the main board. (See Fig.4.) (2) Disconnect the earth wire from the chassis base. (See Fig.4.) (3) From the top side of the main body, disconnect the parallel wires from the conne

39、ctors (CN201, CN205) on the bridge board. (See Fig.5.) Reference: When reassembling, pass the parallel wire through the hole a on the plastic chassis before connecting the par- allel wire to the connector CN201 on the bridge board. (See Fig.5.) (4) Disconnect the earth wire from the chassis base. (S

40、ee Fig.6.) (5) From the both sides of the main body, remove the two screws C attaching the front panel assembly. (See Figs.4 and 6.) (6) From the bottom side of the main body, remove the three screws D attaching the front panel assembly. (See Fig.7.) (7) Release the joints b of the front panel assem

41、bly from the chassis base and remove the front panel assembly in the direction of the arrow. (See Figs.4,6 and 7.) Fig.4 Fig.5 Fig.6 Fig.7 Front panel assembly Card wires Card wires Earth wire Chassis base Main board CN803 CN802 CN43 CN44 b C Parallel wire Parallel wire Plastic chassis Bridge board

42、CN201 CN205 a Parallel wire Front panel assembly Earth wire Chassis base b C Front panel assembly Chassis base b b D (No.MB161)1-9 3.1.3Removing the tuner (See Figs.8 and 9.) Prior to performing the following procedures, remove the metal cover. (1) From the right side of the main body, disconnect th

43、e card wire from the connector CN560 on the main board. (See Fig.8.) (2) From the back side of the main body, remove the two screws E attaching the tuner to the rear panel. (See Fig.9.) Fig.8 Fig.9 Card wires TunerMain board CN560 Rear panelE 1-10 (No.MB161) 3.1.4Removing the rear panel (See Figs.10

44、 to 12) Prior to performing the following procedures, remove the metal cover. (1) From the top side of the main body, disconnect the wire from the connector CN202 on the bridge board. (See Fig.10.) (2) From the back side of the main body, remove the screw F and two screws G attaching the rear cover.

45、 (See Fig.11.) (3) Release the sections d and remove the rear cover. (See Fig.11.) (4) Remove the screw H and eleven screws J attaching the rear panel. (See Fig.12.) (5) From the both sides of the main body, release the joints e attaching the rear panel to the chassis base and remove the rear panel

46、with the fan. (See Fig.12.) 3.1.5Removing the fan (See Figs.10 to 12) Prior to performing the following procedures, remove the metal cover. (1) From the top side of the main body, disconnect the wire from the connector CN202 on the bridge board. (See Fig.10.) (2) From the back side of the main body,

47、 remove the screw F and two screws G attaching the rear cover. (See Fig.11.) (3) Remove the two screws K attaching the fan. (See Fig.12.) (4) Take out the fan from the main body. Fig.10 Fig.11 Fig.12 Bridge board CN202 Rear cover d d d F G Rear panel Fan ee J J J J J HK K (No.MB161)1-11 3.1.6Removin

48、g the main board (See Figs.13 and 14) Prior to performing the following procedures, remove the metal cover and rear panel. Reference: Remove the tuner as required. (1) From the right side of the main body, disconnect the card wires from the connectors (CN43, CN44, CN661, CN802, CN803) on the main bo

49、ard. (See Fig.13.) (2) Remove the two screws L attaching the main board. (See Fig.14.) (3) Disconnect the connector CN217 on the main board to- ward this side and disconnect the connector CN501 on the main board in the direction of the arrow. (See Fig.14.) Reference: When attaching the main board, insert the sections f of the bridge board in the hole of the main board. (See Fig.14.) Insert the section g of the main board in the hole of the chas- sis base before attaching the scr