Jvc-NXMD-1-Service-Manual电路原理图.pdf
COMPACT COMPONENT MD SYSTEMNX-MD1R / NX-MD1NX-MD1R/NX-MD1No.21041Oct. 2001COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.ContentsSafety precautionsPreventing static electricityImportant for laser productsDisassembly methodAdjustment method (CD/MD section)Flow of functional operation until TOC read (CD)Flow of functional operation until TOC read (MD)Maintenance of laser pickup (CD)Replacement of laser pickup (CD)Maintenance of laser pickup(MD)Replacement of laser pickup(MD)Description of major ICs1-21-31-51-61-321-371-381-391-391-401-401-4168SERVICE MANUALCA-NXMD1R/CA-NXMD1 SP-NXMD1SP-NXMD1Area suffix NX-MD1A - AustraliaUS - SingaporeUB - Hong KongUP - KoreaArea suffix NX-MD1RB - U.K.E - Continental EuropeEN - Northern EuropeNX-MD1R/NX-MD11-21. 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 manufacturer. Replacement parts must be identical to those used in the original circuits. Services should be performed 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 characteristics are often not evident from visual 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 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 replacement which does not have the same safety characteristics 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 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 re-assembling.5. Leakage currnet check (Electrical shock hazard testing)After re-assembling 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, particularly any exposed metal part having a return path to the chassis, to a known good earth ground. Any leakage current must not exceed 0.5mA AC (r.m.s.).Alternate check methodPlug 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 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 meausre 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. 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.Good earth groundPlace this probe on each exposedmetal part.AC VOLTMETER(Having 1000 ohms/volts,or more sensitivity)1500 10W0.15 F AC TYPE!Burrs formed during molding may be left over on some parts of the chassis. Therefore, pay attention to such burrs in the case of preforming repair of this system.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 J and C version)NX-MD1R/NX-MD11-3Preventing static electricity1. Grounding to prevent damage by static electricityElectrostatic 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.2. About the earth processing for the destruction prevention 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. 2-1 Ground the workbenchGround 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.2-2 Ground yourselfUse an anti-static wrist strap to release any static electricity built up in your body. 3. Handling the optical pickup1. 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.)2. Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power source can easily destroy the laser diode. 4. 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. Remove solder of the shorting round on the flexible wire 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 wire 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 itConductive material (conductive sheet) or iron plate(caption)Anti-static wrist strapNX-MD1R/NX-MD11-41.Short the shorting round before the flexible wire is removed from connector CN321 on the MD servo boardas shown in Figure. (When the wire is removed without putting up solder, the MD pick-up assembly might destroy.)2.Please remove solder after connecting the flexible wire with when you install picking up in the substrate.*Please refer to “Disassembly method“ in the text for pick-up and how to detach the substrate. 5. Attention when MD traverse unit is decomposed6. Attention when CD traverse unit is decomposed1.Short the shorting round before the flexible wire is removed from connector CN601 on the CD servo boardas shown in Figure. (When the wire is removed without putting up solder, the CD pick-up assembly might destroy.)2.Please remove solder after connecting the flexible wire with when you install picking up in the substrate.*Please refer to “Disassembly method“ in the text for pick-up and how to detach the substrate. CN321PickupShorting roundMD servo control boardShorting roundCN601CD servo boardNX-MD1R/NX-MD11-5Important for laser products1.CLASS 1 LASER PRODUCT2.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 theLaser Unit. Do not disassemble the Laser Unit. Replace the complete Laser Unit if it malfunctions.4.CAUTION : The compact disc player uses invisible laserradiation and is equipped with safety switches whichprevent emission of radiation when the drawer is open and the safety interlocks have failed 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 herein may result in hazardous radiation exposure.VARNING : Osynlig laserstrålning är denna del är öppnad och spårren är urkopplad. Betrakta ej strålen.VARO : Avattaessa ja suojalukitus ohitettaessa olet alttiina näkymättömälle lasersäteilylle.Älä katso säteeseen.ADVARSEL : Usynlig laserstråling ved åbning , når sikkerhedsafbrydere er ude af funktion. Undgå udsættelse for stråling.ADVARSEL : Usynlig laserstråling ved åpning,når sikkerhetsbryteren er avslott. unngå utsettelse for stråling.REPRODUCTION AND POSITION OF LABELSWARNING LABELCLASS 1LASER PRODUCT!CAUTIONPlease use enough caution not to see the beam directly or touch it in case of an adjustment or operationcheck.CLASS 1LASER PRODUCTNX-MD1R/NX-MD11-6Removing the top cover (See Fig.1 and 2)1.2.3.Remove the four screws A attaching the top cover from the back side of the main body.Remove the two screws B attaching the top cover from the both sides of the main body.Remove the top cover from the main body while lifting up the back side of the top cover.1.2.3.Prior to performing the following procedure, remove the top cover.Remove the nine screws C attaching the rear cover from the back side of the main body.Set the speaker and antenna terminals to the locked condition.Disengage the claws a of the rear cover from the chassis and remove the cover toward the rear.Removing the rear cover (See Fig.3)Disassembly methodBFig.1Fig.2Fig.3ATop coverAAntenna terminalRear coverCClaw aSpeaker terminalCClaw aTop coverNX-MD1R/NX-MD11-7Removing the system control board(See Fig.4)Removing the main amplifier board(See Fig.5 and 6)Fig.5Fig.4Fig.61.2.3.4.5.Prior to performing the following procedure, remove the top cover.Prior to performing the following procedure, remove the rear cover.Remove the screw D attaching the card wire support board, then remove the card wire support board.Disconnect the card wires from connectors CN602 and CN605 on the system control board. Remove the two screws E and screw F attaching the system control board.Disconnect connectors CN603 and CN604 on the system control board from the connector CN693 on the regulator board and the CN694 on the repeater board respectively.Disconnect the wire from connector CN601 on the system control board.1.2.3.4.5.6.Prior to performing the following procedure, remove the top cover.Prior to performing the following procedure, remove the rear cover.Disconnect the card wires from connectors CN661, CN695 and CN511 on the main amplifier board.Remove the protector, then remove the screws G attaching the main amplifier board. Remove the screw H and screw I attaching the main amplifier board.Remove the screw J attaching the heat sink from the back side.Disengage claw b on the heat sink and disconnect the connectors CN901 and CN904 on the main amplifier board, from connector CN991 on the repeater board and connector CN994 on the regulator board respectively.Disconnect the wire from connector CN301 on the main amplifier board.CN904ECN601CN301CN901Main amplifierboardCN604FCN605CN602CN603Card wire support boardDSystem control boardGJHICN695CN511CN661ProtectorClaw bRegulator boardENX-MD1R/NX-MD11-8Removing the regulator board(See Fig.7)Removing the AC jack board(See Fig.8)Fig.8Fig.71.2.Prior to performing the following procedure, remove the top cover.Prior to performing the following procedure, remove the rear cover.Prior to performing the following procedure, remove the system control board.Prior to performing the following procedure, remove the main amplifier board.Remove the two screws K and two screws L attaching the regulator board.Disconnect the wires from connectors CN903 and CN995 on the regulator board. 1.2.Prior to performing the following procedure, remove the top cover.Prior to performing the following procedure, remove the rear cover.Prior to performing the following procedure, remove the system control board.Prior to performing the following procedure, remove the main amplifier board.Prior to performing the following procedure, remove the regulator board.Remove the screw M attaching the AC jack board.Disconnect the wire from connector CN921 on the AC jack board. KLCN995RegulatorboardCN903MAC jackboardCN921VoltageSelectorLF901 F9001NX-MD1R/NX-MD11-9Removing the MD mechanism assembly (See Fig.9)Removing the fan motor assembly and fan motor (See Fig.10 and 11)Fig.9Fig.10Fig.111.2.3.Prior to performing the following procedure, remove the top cover.Prior to performing the following procedure, remove the rear cover.Prior to performing the following procedure, remove the system control board.Prior to performing the following procedure, remove the main amplifier board.Remove the two screws N and two screws P attaching the MD mechanism assembly.(Caution) When assembling, attach the screws N atthe point c so that it also fixes the earth wire.Disconnect the card wire from connector CN512 on the repeater board. Disengage the hook d from the MD mechanism assembly and lift the rear of the assembly to remove it.1.2.3.Prior to performing the following procedure, remove the top cover.Prior to performing the following procedure, remove the rear cover.Prior to performing the following procedure, remove the system control board.Prior to performing the following procedure, remove the main amplifier board.Prior to performing the following procedure, remove the regulator board.Prior to performing the following procedure, remove the MD mechanism assembly.Remove the four screws Q attaching the fan motor assembly from the both sides of the sub chassis.Remove the fan motor assembly to the top side. Remove the two screws R attaching the fan motor, then remove the fan motor.(Caution)When assembling, attach the screws Rso that they also fix the
