JVC-MXG71R-cs-sm维修电路原理图.pdf

SERVICE MANUAL No.20952 May. 2001 COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD. MX-G71R COMPACT COMPONENT SYSTEM MX-G71R Safety precautions Important for laser products Preventing static electricity Disassembly method Adjustment method 1-2 1-4 1-5 1-6 1-26 Flow of functional operation until TOC read Maintenance of laser pickup Replacement of laser pickup Description of major ICs 1-30 1-31 1-31 1-32 44 Contents Area Suffix BU.K. EContinental Europe EN EV Northern Europe Eastern Europe PLAY furthermore the manufacturer cannot accept responsibility 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 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 List 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 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. ! 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. (U.K only) MX-G71R 1-4 Important 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 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 laserstrlning r denna del r ppnad och sprren r urkopplad. Betrakta ej strlen. VARO : Avattaessa ja suojalukitus ohitettaessa olet alttiina nkymttmlle lasersteilylle.l katso steeseen. ADVARSEL : Usynlig laserstrling ved bning , nr sikkerhedsafbrydere er ude af funktion. Undg udsttelse for strling. ADVARSEL : Usynlig laserstrling ved pning,nr sikkerhetsbryteren er avslott. unng utsettelse for strling. REPRODUCTION AND POSITION OF LABELS WARNING LABEL !CAUTION Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check. ADVARSEL :Usynlig laserstrling ved bning , nr sikkerhedsafbrydere er ude af funktion. Undg udsttelse for strling. (d) DANGER : Invisibie laser radiation when open and interlock or defeated. AVOID DIRECT EXPOSURE TO BEAM (e) VARNING : Osynlig laserstrlning r denna del r ppnad och sprren r urkopplad. Betrakta ej strlen. (s) VARO : Avattaessa ja suojalukitus ohitettaessa olet alttiina nkymttmlle lasersteilylle.l katso steeseen. (f) CLASS 1 LASER PRODUCT MX-G71R 1-5 Preventing static electricity 1. Grounding to prevent damage by 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. 2. About the earth processing for the destruction prevention by static electricity In the equipment which uses optical pick-up (laser diode), optical pick-up is destroyed by the static electricity of the work environment. Be careful to use proper grounding in the area where repairs are being performed. 2-1 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. 2-2 Ground yourself Use an anti-static wrist strap to release any static electricity built up in your body. 3. Handling the optical pickup 1. 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 testers 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. 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 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 Conductive material (conductive sheet) or iron plate (caption) Anti-static wrist strap Attention when traverse unit is decomposed 1. Remove the disk stopper and T. bracket on the CD changer mechanism assembly. 2. Disconnect the harness from connector on the CD motor board. 3. CD traverse unit is put up as shown in Fig.1. 4. Solder is put up before the card wire is removed from connector CN601 on the CD servo control board as shown in Fig. 2. (When the wire is removed without putting up solder, the CD pick-up assembly might destroy.) 5. Please remove solder after connecting the card wire with CN601 when you install picking up in the substrate. *Please refer to Disassembly method in the text for pick-up and how to detach the CD traverse mechanism. Soldering Fig.1 Fig.2 CD changer mechanism assembly CD traverse unit Flexible cable MX-G71R 1-6 Remove the six screws A on the back of the body. Remove the two screws B on both sides of the body. Remove the metal cover from the body by lifting the rear part of the cover. 1. 2. 3. Disassembly method Removing the metal cover (See Fig.1 to 3) Do not break the front panel tab fitted to the metal cover. CAUTION: Fig.1 Fig.2 Fig.3 A AA Metal cover Metal cover B Metal cover B MX-G71R 1-7 Prior to performing the following procedure, remove the metal cover. Disconnect the card wire from connector CN661 on the Main board. Remove the two screws C on the upper side of the body and the two screws D on the back of the rear panel. Remove the plastic rivet attaching the main board. Disconnect the fan connector CN705. Pull both the rear panel and the front panel assembly to the outside, then remove the CD changer mechanism assembly by lifting the rear part of the assembly. 1. 2. 3. 4. 5. Removing the CD changer mechanism assembly (See Fig.4 and 5) Prior to performing the following procedure, remove the metal cover and CD changer mechanism assembly. Disconnect the card wires from connector CN870, CN871 and CN315 on the main board respectively. Remove the tie band and disconnect the wire from connector CN703 on the amplifier board. Disconnect the wire from connector CN220 on the transformer board. 1. 2. 3. Removing the front panel assembly (See Fig.6 to 10) To prevent damage to the CD fitting, be sure to pull both the rear panel and the front panel assembly enough to remove the CD changer mechanism assembly. CAUTION: Fig.4 Fig.5 Fig.6 Fig.7 Front panel assembly CC CD changer mechanism assembly Main board CN661 CD changer mechanism assembly D Main board CN661 Front panel assembly Plastic rivet Amplifier board CN703 Main board CN870 CN871 CN315 Transformer board CN220 Front panel assembly Front panel assembly Main board Rear panel Fan connector CN705 Tie band MX-G71R 1-8 Remove the four screws E on the bottom of the body. Release the two joints a on the lower right and left sides of the body using a screwdriver, and remove the front panel assembly toward the front. 4. 5. Fig.8 Fig.9 Fig.10 E (Bottom) Front panel assembly Joint a Joint a Front panel assembly Front panel assembly MX-G71R 1-9 Prior to performing the following procedure, remove the metal cover and the CD changer mechanism assembly. Disconnect the card wire from connector CN1 on the tuner board on the right side of the body. Remove the plastic rivet fixing the tuner board. Remove the two screws F on the back of the body. 1. 2. 3. Removing the tuner board (See Fig.11 and 12) Prior to performing the following procedure, remove the metal cover and the CD changer mechanism assembly. Remove the screw G attaching the rear cover on the back of the body. Push each tab of the four joints b in the direction of the arrow and release. Remove the twelve screws F attaching the rear panel. Release the joints c on each lower side of the rear panel using a screwdriver and remove the rear panel backward. 1. 2. 3. 4. Removing the rear cover / rear panel (See Fig.12 to 15) Note : Remove the tuner board in case of necessity. (Refer to Fig.11) Fig.11 Fig.12 Fig.13 Fig.14Fig.15 CN1 Plastic rivet Tuner board Rear panel Rear panelG F Joint b Joint b Rear cover Rear panel F F F F Joint c Joint cRear panelRear panel MX-G71R 1-10 Prior to performing the following procedure, remove the metal cover, the CD changer mechanism assembly, the rear panel and the tuner board. Disconnect the card wires from connector CN870, CN871 and CN315 on the main board. Disconnect the flat wires from connector CN704 and CN706 on the amplifier board. Remove the screw H attaching the main board on the right side of the body. Disconnect connector CN201 and CN202 on the main board from the regulator board. 1. 2. 3. 4. Removing the main board (See Fig.16 and 17) Prior to performing the following procedure, remove the metal cover, the CD changer mechanism assembly and the rear panel. Disconnect the connector CN217 on the speaker board from the regulator board. 1. Removing the speaker board (See Fig.18) It is not necessary to remove the main board. REFERENCE: Fig.16 Fig.17 Fig.18 Front panel assembly Amplifier board CN704 CN706 Main board CN870 CN871 CN315 Plastic rivet Main board Front panel assembly H CN201 CN202 Regulator board Regulator board CN217 Speaker board MX-G71R 1-11 Prior to performing the following procedure, remove the metal cover, the CD changer mechanism assembly and the rear panel. Remove the two tie band attaching the wire to the voltage board. Disconnect the wires from connector CN703, CN704 and CN706 on the amplifier board respectively. Disconnect connector CN215 on the amplifier board and CN216 on the voltage board from the regulator board (The heat sink and heat sink bracket will be detached at once). Remove the four screws I attaching the amplifier board to the heat sink. Remove the two screws J, the board bracket and the voltage board. 1. 2. 3. 4. 5. Removing the amplifier board / voltage board / heat sink (See Fig.19 to 21) Prior to performing the following procedure, remove the metal cover, the CD changer mechanism assembly and the rear panel. Disconnect the wire from connector CN250 on the power supply board. Move the power cord stopper upward and pull out it from the base chassis. Disconnect the wire from connector CN218 on the power supply board. Remove the power supply board from connector CN213 on the regulator board. 1. 2. 3. 4. Removing the power cord / power supply board (See Fig.19) Fig.19 Fig.20 Amplifier board CN704 CN706 CN216 Regulator board CN215 Tie band CN703 Voltage board Amplifier board Heat sink Voltage board I I J Voltage board Fig.21 CN218 Power supply board CN250 Power cord stopper Base chassis Power cord CN213 Board bracket Tie band Tie band MX-G71R 1-12 Prior to performing the following procedure, remove the metal cover, the CD changer mechanism assembly and the rear panel. Remove the tie band attaching the wire to the voltage board. Disconnect the wires from connector CN218 on the power supply board. Disconnect the wires from connector CN220 on the transformer board. Disconnect the wire from connector CN204 on the regulator board. Remove the four screws K attaching the transformer assembly. 1. 2. 3. 4. 5. Removing the power transformer assembly (See Fig.22 and 23) Prior to performing the following procedure, remove metal cover, CD changer mechanism assembly, rear panel, tuner board, main board, amplifier board, voltage board and speaker board. Disconnect the wire from connector CN204 on the regulator board. Remove the two screws L attaching the regulator board. 1. 2. Removing the regulator board (See Fig.23) Fig.22 Fig.23 Power transformer assembly CN204 Transformer board CN220 K K L L Regulator board Tie band Voltage board CN218 Power transformer assembly Power supply board MX-G71R 1-13 Prior to performing the following procedure, remove the metal cover, the CD changer mechanism assembly and the front panel assembly. Disconnect the card wire from connector CN306 on the head amplifier TW2111A, Reverse ; TW2121A Fast Forward and Rewind ; TW2231A 9. Test disc : CTS-1000(12cm),GRG-1211(8cm) 10. Jitter meter Measurement conditions Power supply voltage AC230V(50Hz) Measurement output terminal : Speaker out :TP101(Mesuring for TUNER/DECK/CD) :Dummy load 6ohm Radio input signal AM modulation frequency : 400Hz Modulation factor : 30% FM modulation frequency : 400Hz Frequency displacement : 22.5kHz Frequency Range AM : MW 522kHz1629kHz LW 144kHz288kHz FM : 87.5MHz108MHz Standard measurement positions of volume and switch Power : Standby (Light STANDBY Indicator) Sub woofer VOL. : Minimum Sound mode : OFF Main VOL. : 0 Minimum Traverse mecha set position : Disc 1 Precautions for measurement 1. Apply 30pF and 33kohm to the IF sweeper output side and 0.082 F and 100kohm in series to the sweeper input side. 2. The IF sweeper output level should be made as low as possible within the adjustable range. 3. Since the IF sweeper is a fixed device, there is no need to adjust this sweeper. 4. Since a ceramic oscillator is used, there is no need to perform any MPX adjustment. 5. Since a fixed coil is used, there is no