JVC-EXA1-cs-sm维修电路原理图.pdf

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1、SERVICE MANUAL COPYRIGHT 2005 Victor Company of Japan, Limited No.MB349 2005/1 COMPACT COMPONENT SYSTEM MB34920051 EX-A1 TABLE OF CONTENTS 1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2、2SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7 3DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

3、 4ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24 5TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4、 . . . 1-28 - - - - - - - - RadioFans.CN 收音机爱 好者资料库 1- 2 (No.MB349) SPECIFICATION Designs and Specifications are subject to change without notice. GeneralPower sourceAC 230 V 50 Hz Power consumption24 W (in operation) 1.1 W (on standby) Weight3.0 kg External dimensions (W I I H I ID)232 mm I I 100 m

5、m I I 269 mm DVD playerPlayable discsDVD VIDEO, DVD AUDIO, VCD, Super VCD, CD, CD- R/RW (CD, VCD, MP3, JPEG format), DVD- R/ RW (video format) Video output Color systemPAL Horizontal resolution500 lines SCART connector I I 1 Audio output Analog sound output Speakers I I 260 W (30W + 30W) at 4 (10% T

6、HD) Output power (IEC 268- 3)Fitting impedance : 4 to 16 Headphones I I 111 mW/32 Fitting impedance : 16 to 1 k Subwoofer I I 1500 mVrms/10 k Digital sound outputOptical I I 1- 21 dBm to - 15 dBm Other outputAV COMPU LINK I I 2 (3.5) Audio inputSound inputAUX I I 1 Level 1250 mV/50 k Level 2500 mV/5

7、0 k TunerFM tunerReceiving frequency87.5 MHz to 108.0 MHz Antenna75 - unbalanced type AM tunerReceiving frequency522 kHz to 1629 kHz AntennaExternal antenna jack (loop antenna) SpeakerType1- way bass- reflex type Magnetically shielded type Speaker8cm cone I I 1 Power handling capacity30 W Impedance4

8、 Sound pressure level81 dB/W m Dimension (W I I H I I D)120 mm I I161 mm I I 239 mm Weight (1 unit)1.6 kg RadioFans.CN 收音机爱 好者资料库 (No.MB349)1- 3 SECTION 1 PRECAUTION 1.1Safety Precautions (1) This design of this product contains special hardware and many circuits and components specially for safety

9、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 original circuits. Services should be per- formed by qualified personnel only. (2) Alterations of the desi

10、gn 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 further relieve the manufacture of responsibility for personal injury or property damage resulting therefrom.

11、 (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 afforded by them necessarily be obtained by us- ing replacement components rated for higher voltage, wat

12、t- 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 shading on the schematics and by ( ) on the Parts List in the Service Manual. The use of a substitute repl

13、acement 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 in the products are routed and dressed with ties, clamps, tubings, barriers and the like to be separate

14、d 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 be observed, and it should be confirmed that they have been returned to normal, after reassem- bling.

15、(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 heads, headphone jack, control shafts, etc.) to be sure the product is safe to operate without danger of el

16、ectrical 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 exposed metal parts of the cabinet, particular- ly any exposed metal part having a return path to the cha

17、ssis, 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, 1,000 per volt or more sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a

18、0.15k kF 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 metal part, particularly any exposed metal part having a return path to the chassis, and measure t

19、he 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.). 1.2Warning (1) This equipment has been designed and manufactured to meet international safety standa

20、rds. (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 essential that safety critical components are replaced by approved parts. (5) If mains voltage selector i

21、s 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 repair of this system. 1.4Critical parts for safety In regard with component parts appearing on the si

22、lk- 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 safety. When replacing them, be sure to use the parts of the same type and rating as specified by the

23、 manufacturer. (This regulation dose not Except the J and C version) - - - - - - - 1- 4 (No.MB349) 1.5 Safety Precautions (U.K only) (1) This design of this product contains special hardware and many circuits and components specially for safety purposes. For con- tinued protection, no changes should

24、 be made to the original design unless authorized in writing by the manufacturer. Replace- ment parts must be identical to those used in the original circuits. (2) Any unauthorised design alterations or additions will void the manufacturers guarantee; furthermore the manufacturer cannot accept respo

25、nsibility for personal injury or property damage resulting therefrom. (3) Essential safety critical components are identified by ( ) on the Parts List and by shading on the schematics, and must never be replaced by parts other than those listed in the manual. Please note however that many electrical

26、 and mechanical parts in the product have special safety related characteristics. These characteristics are often not evident from visual inspection. Parts other than specified by the manufacturer may not have the same safety characteristics as the recommended replacement parts shown in the Parts Li

27、st of the Service Manual and 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 temperature parts, moving parts and/or sharp edges for the prevention of electric shock

28、and fire hazard. When service is required, the original lead routing and dress should be observed, and it should be confirmed that they have been returned to normal, after re- assembling. 1.5.1Warning (1) Service should be performed by qualified personnel only. (2) This equipment has been designed a

29、nd manufactured to meet international safety standards. (3) It is the legal responsibility of the repairer to ensure that these safety standards are maintained. (4) Repairs must be made in accordance with the relevant safety standards. (5) It is essential that safety critical components are replaced

30、 by approved parts. (6) If mains voltage selector is provided, check setting for local voltage. - - - - - - - - - - - - - - - - - - (No.MB349)1- 5 1.6Preventing static electricity Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can

31、destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs. 1.6.1 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

32、use proper grounding in the area where repairs are being performed. (1) Ground the workbench Ground 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

33、 strap to release any static electricity built up in your body. (3) Handling the optical pickup 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 ori

34、ginal condition. (Refer to the text.) 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. 1.7Handling the traverse unit (optical pickup) (1) Do not subject the traverse unit (optical pickup) to str

35、ong 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 specific details, refer to the replacement procedure in the text. Remove the anti- static pin when replacing the traverse unit. Be careful no

36、t 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) I t is not possible to adjust the semi- fixed resistor that adjusts the laser power. Do not turn it. 1.8Attention when traverse unit is decomposed

37、 *Please refer to Disassembly method in the text for the pickup unit. Apply solder to the short land 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 electricit

38、y.) In the assembly, be sure to remove solder from the short land sections after connecting the flexible wire. - - - - - - - - - - - - - - 1- 6 (No.MB349) 1.9Important for laser products - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

39、 - - - - - - - - - - - - - - - - - - - - - - - - -; - -; *- - *- - -; -; - - - - - - - * * - - - - - - - - - - - -; ; - -; ; - ; ; ; - ; - -; -; - - - - - - - - - - - - - - - - - -; - -; *- - *- - -; -; - - - - - - - * * - - - - - - - - - - - -; ; - -; ; - ; ; ; - ; - -; -; (No.MB349)1- 7 SECTION 2

40、SPECIFIC SERVICE INSTRUCTIONS The DVD mechanism was running changed. The label is added to the lower left on the back of a center unit as the discernment method of a DVD mechanism from goods appear- ance. Please refer to each model and the following manuals about the goods with which the label is no

41、t stuck on the position of a figure. EX-A1 B, E, EN versionMB156 EX-A1 EE, EV, A versionMB181 - - - 1- 8 (No.MB349) SECTION 3 DISASSEMBLY 3.1Main body section 3.1.1Removing the top cover (See Fig.1) (1) From the top side of the main body, remove the four screws A attaching the top cover. Fig.1 (No.M

42、B349)1- 9 3.1.2Removing the AL panel L and AL panel R (See Figs.2 to 7.) Remove the top cover. (1) Remove the two screws B, screw C and screw C attaching the bridge A. (See Fig.2.) Reference: When attaching the screw C attach the lug wire with it. (See Fig.2.) (2) Remove the two screws C attaching t

43、he bridge B. (See Fig.2.) (3) Remove the two screws C attaching the bridge C. (See Fig.2.) (4) From the back side of the main body, remove the three screws D attaching the bridge C. (See Fig.3.) Reference: When attaching the screws C attach the lug wires with them. (See Fig.2.) (5) From the top side

44、 of the main body, remove the two screws E attaching the AL panel L and AL panel R. (See Fig.4.) (6) From the bottom side of the main body, remove the three screws F attaching the wood bar. (See Fig.5.) (7) Remove the six screws G and two screws H attaching the AL panel L and AL panel R. (See Fig.6.

45、) (8) Remove the AL panel L and AL panel R in the direction of the arrow 2 while extending the back section of the AL pan- el L and AL panel R in the direction of the arrow 1. (See Fig.7.) Fig.2 Fig.3 Fig.4 - - 1- 10 (No.MB349) Fig.5 Fig.6 Fig.7 (No.MB349)1- 11 3.1.3Removing the front panel assembly

46、 (See Fig.8) Remove the top cover, AL panel L and AL panel R. (1) Removing the three screws J attaching the front panel as- sembly. (See Fig.8.) (2) Release the claws a attaching the front panel assembly and remove the front panel assembly in the direction of the arrow. (See Fig.8.) Note: When attaching the front panel assembly, confirm that the con- nector CN804 on the front board is disconnected in the con- nector CN704 on the micom board certainly. Fig.8 - - 1- 12 (No.MB349) 3.1.4Removing the rear panel (See Fig.9.) For A version From the back side o