JVC-UXH300-cs-sm 电路图 维修手册.pdf

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1、SERVICE MANUAL COPYRIGHT 2004 Victor Company of Japan, Limited No.MB297 2004/7 MICRO COMPONENT SYSTEM MB29720047 UX-H300,UX-H330,UX-H350 TABLE OF CONTENTS 1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

3、 . . . . . . 1-7 4ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18 5TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4、 . . . . . . . . . . . 1-20 Area suffix US - Singapore UT - Taiwan UW - Brazil,Mexico,Peru UX-H300 Area suffix UJ - U.S.Military UX-H350 Area suffix UT - Taiwan UW - Brazil,Mexico,Peru UX-H330 RadioFans.CN 收音机爱 好者资料库 1-2 (No.MB297) SPECIFICATION Design and specifications are subject to change withou

5、t notice. Amplifier Section Output Power15 W per channel, min. RMS, driven into 4 at 1 kHz with no more than 10% total harmonic distortion. (IEC268-3) Audio input sensitivity/Impedance (at 1 kHz) AUX:500 mV/50 k Speakers/Impedance4 - 16 TunerFM tuning range100 kHz intervals87.5 MHz-108.0 MHz 50 kHz

6、intervals87.50 MHz-108.00 MHz AM tuning range10 kHz intervals530 kHz-1 710 kHz 9 kHz intervals531 kHz-1 710 kHz CD playerDynamic range85 dB Signal-to-noise ratio85 dB Wow and flutterImmeasurable Cassette deckFrequency responseNormal (type I)100 Hz-10 000 Hz Wow and flutter0.35% (WRMS) GeneralPower r

7、equirementAC 110 V-127 V / AC 220 V- 240 V (adjustable with the voltage se- lector), 50 Hz / 60Hz Power consumption 2 W (on standby)40 W (at operation) Dimensions (W/H/D) (approx.)152 mm 233 mm 292 mm Mass (approx.)3.9 kg Speaker Section TypeFull range, bass-reflex type Speakers10 cm cone 1 Power ha

8、ndling capacity15 W Impedance4 Frequency range100 Hz-15 kHz Dimensions (W/H/D) (approx.)147 mm 233 mm 189 mm Mass (approx.)1.9 kg each RadioFans.CN 收音机爱 好者资料库 (No.MB297)1-3 SECTION 1 PRECAUTION 1.1Safety Precautions (1) This design of this product contains special hardware and many circuits and comp

9、onents 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 original circuits. Services should be per- formed by qualified personnel only.

10、 (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 further relieve the manufacture of responsibility for personal injury or property

11、 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 afforded by them necessarily be obtained by us- ing replacement components ra

12、ted 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 shading on the schematics and by ( ) on the Parts List in the Service Manual. T

13、he 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 in the products are routed and dressed with ties, clamps, tubings, barriers

14、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 be observed, and it should be confirmed that they have been returned to nor

15、mal, 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 heads, headphone jack, control shafts, etc.) to be sure the product is safe to o

16、perate 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 exposed metal parts of the cabinet, particular- ly any exposed metal part havi

17、ng 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, 1,000 per volt or more sensitivity in the following manner. Connect a 1,500 10

18、W 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 metal part, particularly any exposed metal part having a return path to the

19、 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.). 1.2Warning (1) This equipment has been designed and manufactured to meet inte

20、rnational 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 essential that safety critical components are replaced by approved parts. (5) If m

21、ains 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 repair of this system. 1.4Critical parts for safety In regard with component pa

22、rts 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 safety. When replacing them, be sure to use the parts of the same type and rati

23、ng 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 0.15 F AC TYPE RadioFans.CN 收音机爱 好者资料库 1-4 (No.MB297) 1.5Preventing static ele

24、ctricity 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 performing repairs. 1.5.1 Grounding to prevent damage by static electricity S

25、tatic 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 Ground the workbench by laying conductive material (such as a conductive sheet

26、) 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 In order to maintain quality during transport and before installation, both

27、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 diode in the optical pickup. The testers internal power source can easily dest

28、roy 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 cable using nippers, etc. after replacing the optical pickup. For specific deta

29、ils, 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 carefully as it may break when subjected to strong force. (4) I t is not possible

30、 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 land sections before the flexible wire is disconnected from the connecto on th

31、e 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 flexible wire. 1M Conductive material (conductive sheet) or iron palate (capti

32、on) Anti-static wrist strap Short-circuit point CD pickup board (No.MB297)1-5 1.8Important for laser products 1.CLASS 1 LASER PRODUCT 2.DANGER : Invisible laser radiation when open and inter lock failed or defeated. Avoid direct exposure to beam. 3.CAUTION : There are no serviceable parts inside the

33、 Laser Unit. Do not disassemble the Laser Unit. Replace the complete Laser Unit if it malfunctions. 4.CAUTION : The CD,MD and DVD player uses invisible laser radiation and is equipped with safety switches which prevent emission of radiation when the drawer is open and the safety interlocks have fail

34、ed or are defeated. It is dangerous to defeat the safety switches. 5.CAUTION : If safety switches malfunction, the laser is able to function. 6.CAUTION : Use of controls, adjustments or performance of procedures other than those specified here in may result in hazardous radiation exposure. REPRODUCT

35、ION AND POSITION OF LABELS CAUTION : Visible and Invisible laser radiation when open and interlock failed or defeated. AVOID DIRECT EXPOSURE TO BEAM. (e) VARNING : Synlig och osynling laserstrlning nr den ppnas och sprren r urkopplad. Betrakta ej strlen. (s) VARO : Avattaessa ja suojalukitus ohitett

36、una tai viallisena olet alttiina nkyvlle ja nkymttmlle lasersteilylle. Vlt steen kohdistumista suoraan itseesi. (f) ADVARSEL : Synlig og usynlig laserstrling nr maskinen er ben eller interlocken fejeler. Undg direkte eksponering til strling. (d) ! Please use enough caution not to see the beam direct

37、ly or touch it in case of an adjustment or operation check. CLASS 1 LASER PRODUCT CAUTION : Visible and Invisible laser radiation when open and interlock failed or defeated. AVOID DIRECT EXPOSURE TO BEAM. (e) VARNING : Synlig och osynling laserstrlning nr den ppnas och sprren r urkopplad. Betrakta e

38、j strlen. (s) VARO : Avattaessa ja suojalukitus ohitettuna tai viallisena olet alttiina nkyvlle ja nkymttmlle lasersteilylle. Vlt steen kohdistumista suoraan itseesi. (f) ADVARSEL : Synlig og usynlig laserstrling nr maskinen er ben eller interlocken fejeler. Undg direkte eksponering til strling. (d)

39、 WARNING LABEL 1-6 (No.MB297) SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS. (No.MB297)1-7 SECTION 3 DISASSEMBLY 3.1Main body 3.1.1Removing the front panel assembly (See Fig.1 to 6) (1) From the back of the body, remove the two screws A,

40、and the two screws B attaching the front panel assembly. (2) Remove the six screws D on both sides of the body. (3) Remove the screw E on the bottom of the body. (4) Move the front panel assembly in the direction of the arrow and remove. Disconnect connector CN402, CN801 on the main board and discon

41、nect the wire from FM-ANT. Caution: When reassembling the front panel assembly, fit the right and left tabs a to the notch. Fig.1 Fig.2 Fig.3 CD mechanism assembly Rear cover assembly B A Front panelh assembly CD mechanism assembly Rear cover assembly D Front panelh assembly CD mechanism assembly Re

42、ar panel assembly D 1-8 (No.MB297) Fig.4 Fig.5 Fig.6 Front panel assembly Rear panel assembly E CD mechanism assembly Front panel assembly Rear cover assembly Joint a CD mechanism assembly Front panel assembly Main board Rear cover assembly FM-ANT CN402 CN801 (No.MB297)1-9 3.1.2Removing the main boa

43、rd (See Fig.7, 8) Prior to performing the following procedure, remove the front panel assembly. (1) Disconnect the wire from all connectors on the main board. (2) Disconnect the wire from the two connectors on the cas- sette mechanism assembly. (3) Release the three bands attaching the wire to the m

44、ain board. (4) Remove the two screws F from the front panel assembly. Release the joint b. Fig.7 Fig.8 CD mechanism assembly CD mechanism assembly Front panel assembly CN203 Main board CN303 CN602 CN301 CN401 CN603 CN103 Main board band CD mechanism assembly Front panel assembly b F 1-10 (No.MB297)

45、3.1.3Removing the CD mechanism assembly (See Fig.9, 10) Prior to performing the following procedure, remove the front panel assembly and the main board. (1) Release the four bands setting the wire. (2) Disconnect the wire from the connector on the CD door switch and from CN601, CN603 and CN604 on th

46、e CD mechanism board respectively. (3) Remove the three screws G attaching the CD mechanism assembly. (4) Release the joint d to remove the CD mechanism assem- bly from the front panel assembly. Fig.9 Fig.10 CD mechanism assembly CD door switch CD mechanism board Front panel assembly CN604 CN603 CN6

47、01 Band Band Band G G G CD mechanism assembly Front panel assembly Joint d Joint d (No.MB297)1-11 3.1.4Removing the CD mechanism assembly (See Fig.11 to 13) Prior to performing the following procedure, remove the front panel assembly, the main board and the CD mechanism as- sembly. Caution: Before d

48、isconnecting the card wire from connector CN607 on the CD mechanism board and from CD pickup board, solder the short-circuit point on the CD pickup board. If you do not fol- low this instruction, the pickup may be damaged. (1) Remove the four screws H attaching the CD mechanism board. (2) Move the C

49、D mechanism board temporarily and discon- nect the wire from connector CN606. (3) Solder the short-circuit point on the CD pickup board. (4) Disconnect the card wire from connector CN607 on the CD mechanism board. Caution: Make sure to unsolder the short-circuit point after reconnecting the card wire to the CD pickup board and to connector CN607 on the