JVC-UXH35-cs-sm 电路图 维修手册.pdf

SERVICE MANUAL COPYRIGHT 2003 VICTOR COMPANY OF JAPAN, LIMITED No.MB053 2003/9 MICRO COMPONENT SYSTEM MB05320039 UX-H35 TABLE OF CONTENTS 1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 2SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 3DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7 4ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19 5TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23 MICRO COMPONENT SYSTEM Area Suffix A - Australia RadioFans.CN 收音机爱 好者资料库 1-2 (No.MB053) SPECIFICATION AmplifierOutput Power20 W (10 W + 10 W) at 4 (10% THD) Audio input sensitivity/Impedance (at 1 kHz) AUX 500 mV/48.75 k Speakers/Impedance4 TunerFM tuning range87.50 MHz - 108.00 MHz AM tuning range522 kHz - 1 629 kHz CD playerDynamic range85 dB Signal-to-noise ratio90 dB Wow and flutterImmeasurable Cassette deck Frequency response Normal (type I)50 Hz - 15 000 Hz Wow and flutter0.15% (WRMS) SpeakerSpeaker units Full range8.0 cm cone 1 Impedance4 Dimensions (approx.)135 mm 203 mm 190 mm (W/H/D) Mass (approx.)1.7 kg each GeneralPower requirementAC IN240 V , 50 Hz DC IN12 V, 4 A Power consumption35 W (at operation) 3.0 W (on standby) Dimensions (approx.)412 mm 208 mm 275 mm (W/H/D) Mass (approx.)6.5 kg RadioFans.CN 收音机爱 好者资料库 (No.MB053)1-3 SECTION 1 PRECAUTION 1.1 Safety Precautions (1) This design of this product contains special hardware and many circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the man- ufacturer. 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 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 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 rated for higher voltage, watt- age, etc. Replacement parts which have these special safety characteristics are identified in the Parts List of Service Manu- al. Electrical components having such features are iden- tified 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 character- istics as the recommended replacement parts shown in the Parts List of Service Manual may create shock, fire, or oth- er 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 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 reassembling. (5) Leakage shock hazard testing) After reassembling the product, always perform an isolation check on the exposed metal parts of the product (antenna terminals, knobs, metal cabinet, screw heads, 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 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 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 ohms per volt or more sensitivity in the following manner. Connect a 1,500 ohm 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 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.). 1.2 Warning (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 essential 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 repair 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 safety. When replacing them, be sure to use the parts of the same type and rating as specified by the manufacturer. (Except the JC version) RadioFans.CN 收音机爱 好者资料库 1-4 (No.MB053) 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 performing 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 CD players. 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) 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 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 destroy the laser diode. 1.6 Handling 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 details, refer to the replace- ment 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) It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it. 1.7 Attention when traverse unit is decomposed *Please refer to Disassembly method in the text for the CD pickup unit. Apply solder to the short land sections before the flexible wire is disconnected from the connector CN601 on the CD servo board. (If the flexible wire is disconnected without applying solder, the CD 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. CN601 on mechanism board Shorting round Shorting round Flexible wire (No.MB053)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 Laser Unit. Do not disassemble the Laser Unit. Replace the complete Laser Unit if it malfunctions. (4) CAUTION : The compact disc 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 failed or are de feated. 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 herein may result in hazardous radiation exposure. CAUTION Please use enough caution not to see the beam directly or touch it in case of anadjustment or operation check. VARNING Osynlig laserstrlning r denna del r ppnad och sprren r urkopplad. Betrakta ej strlen. VARO Avattaessa ja suojalukitus ohitettaessa olet alttiina nkymt- tmlle lasersteilylle. l katso steeseen. ADVARSEL Usynlig laserstrling ved bning, nr sikkerhedsafbrydere er ude af funktion. Undg udsasttelse for strling. ADVARSEL Usynlig laserstrling ved pning, nr sikkerhetsbryteren er avs- lott. unng utsettelse for strling. REPRODUCTION AND POSITION OF LABELS Caution label 1-6 (No.MB053) SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS. (No.MB053)1-7 SECTION 3 DISASSEMBLY 3.1Main body 3.1.1Removing the rear panel (See Fig.1,2) (1) From behind the body, remove the eight screws A attach- ing the rear panel. (2) Turing the body upside down, remove the two screws B at- taching the rear panel, and remove. Fig.1 Fig.2 A A A A BB CC Front panel assembly Rear panel 1-8 (No.MB053) 3.1.2Removning the side panel (L) and (R) (See Fig.25) Prior to performing the following procedure, remove the rear panel. (1) Turning the body upside down, remove the two screws C attaching the front panel assembly. (2) Turning the body initial position, open the CD door while pressing the upper OPEN button. (3) Moving the side panel (L) in the arrow direction, remove the panel from the left side of the body. (4) Moving the side panel (R) in the arrow direction, remove the panel from the right side of the body. Fig.3 Fig.4 Fig.5 Side panel (L) Side panel (R) (No.MB053)1-9 3.1.3Removing the CD player assembly (See Fig.6,7) Prior to performing the following procedure, remove the rear panel and the left and right side panels. (1) Disconnect the card wires from the two connectors CN603 and CN604 on the CD servo control board. (2) Remove the two screws D attaching the front panel assem- bly on the both sides. (3) Release the two joints a on the both sides of the front panel assembly. (4) Move the CD player assembly in the direction of the arrow. Fig.6 Fig.7 CD player assemblyCD servo control board CN604 D a CN603 D CD player assembly a 1-10 (No.MB053) 3.1.4Removing the power amplifier board and heat sink (See Fig.810) Prior to performing the following procedure, remove the rear panel, the left and right side panels, and the CD player assem- bly. (1) Remove the five screws E and F attaching the heat sink. (2) Disconnect the wire from connector CN901 on the power supply board. (3) Disconnect the card wire from connector CN305 on the power amplifier board. (4) Remove the screw G attaching the power amplifier board. (5) Disconnect the connector CN301 on the power amplifier board, and release the two joints b. REFERENCE: Remove the screw F, then power amplifier board can be re- moved without removing heat sink. Fig.8 Fig.9 Fig.10 E E F Heat sink Power amplifier board CN301 Power supply board CN901 CN305 Power amplifier board G bb (No.MB053)1-11 3.1.5Removing the tuner board (See Fig.11) Prior to performing the following procedure, remove the rear panel, the left and right side panels, and the CD player assem- bly. (1) Remove the screw H attaching the tuner board from the right side of the body. (2) Disconnect the card wire from the connector CN1 on the tuner board. (3) Release the joint c, and remove the tuner board backward. Fig.11 3.1.6Removing the front panel assembly (See Fig.12,13) Prior to performing the following procedure, remove the rear panel the left and right side panels, the CD player assembly, the power amplifier board. (1) Disconnect the card wire from the connector CN714 on the LCD system CPU board. (2) Release the joint d on the bottom of the front panel assem- bly using a screwdriver, and remove the front panel assem- bly toward the front. Fig.12 Fig.13 H Tuner board CN1 c LCD system CPU board CN714 d Front panel assembly 1-12 (No.MB053) 3.1.7Remove the power transformer and power supply board (See Fig.14,15) Prior to performing the following procedure, remove the rear panel, the left and right side panels, the CD player assembly, the power amplifier board and the tuner board. (1) Remove the screw I attaching the jack holder and release joint e, and then remove jack holder. (2) Remove the four screws J attaching the power transformer and power supply board. Fig.14 Fig.15 I Jack holder e J J Power transformer Power supply board (No.MB053)1-13 3.1.8Remove the cassette mechanism assembly (See Fig.16,17) Prior to performing the following procedure, remove the front panel assembly. (1) Disconnect the card wire from the connector CN713 on the LCD system CPU board. (2) Remove the four screws K and L attaching the cassette mechanism assembly, and remove. Fig.16 Fig.17 Front panel assembly LCD system CPU board CN713 K L Cassette mechanism assembly 1-14 (No.MB053) 3.1.9Remove the LCD system CPU board (See Fig.18) (1) Disconnect the wire from the connector CN716 on the LCD system CPU board. (2) Release the two joints f and pull out the LCD system CPU board. Fig.18 3.1.10 Removing the operating switch board (See Fig.19,20) Prior to performing the following procedure, remove the front panel assembly, the cassette mechanism assembly and the LCD system CPU board. (1) Remove the two screws M attaching the operating switch button. (2) Remove the two screws N attaching the operating switch board, and remove. Fig.19 Fig.20 f LCD system