Jvc-KWXC-888-Service-Manual(1) 电路图 维修手册.pdf

SERVICE MANUAL COPYRIGHT 2004 Victor Company of Japan, Limited No.MA081 2004/7 CD/CASSETTE RECEIVER MA08120047 KW-XC888 TABLE OF CONTENTS 1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 2SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 3DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7 4ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-38 5TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-42 Area suffix UN -Asean RadioFans.CN 收音机爱 好者资料库 1-2 (No.MA081) SPECIFICATION Design and specifications are subject to change without notice. AUDIO AMPLIFIER SECTION Maximum Power Output (DC 16V)Front50 W per channel Rear50 W per channel Continuous Power Output (10% THD) Front25 W per channel into 4 . Rear25 W per channel into 4 . Load Impedance4 (4 to 8 allowance) TUNER SECTION Frequency RangeFM87.5 MHz to 108.0 MHz AM531 kHz to 1 602 kHz FM TunerUsable Sensitivity6 dBV Stereo Separation28 dB AM TunerSensitivity30 dBV CD PLAYER SECTION TypeCompact disc player Signal Detection SystemNon-contact optical pickup (semiconductor laser) Number of channels2 channels (stereo) Frequency Response30 Hz to 20 000 Hz Signal-to-Noise Ratio75 dB Wow and FlutterLess than measurable limit Channel Separation (1 kHz)65 dB CASSETTE DECK SECTION Frequency Response30 Hz to 16 000 Hz Wow and Flutter0.2 % (WRMS) GENERAL Power RequirementOperating VoltageDC 14.4 V (11 V to 16 V allowance) Grounding SystemNegative ground Dimensions (W H D)Installation Size178 mm 100 mm 175 mm Front Panel Size183 mm 103 mm 15 mm Mass2.2 kg (excluding accessories) RadioFans.CN 收音机爱 好者资料库 (No.MA081)1-3 SECTION 1 PRECAUTION 1.1Safety Precautions ! 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. ! Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check. RadioFans.CN 收音机爱 好者资料库 1-4 (No.MA081) 1.2Preventing 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. 1.2.1 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. 1.3Handling 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. 1.4Attention when traverse unit is decomposed *Please refer to Disassembly method in the text for the CD pickup unit. Apply solder to the short land before the flexible wire is disconnected from the connector on the CD pickup unit. (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 after connecting the flexible wire. 1M (caption) Anti-static wrist strap Conductive material (conductive sheet) or iron plate Pickup Short-circuit point (Soldering) Flexible wire PickupShort-circuit point (No.MA081)1-5 1.5Important 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 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 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 here in may result in hazardous radiation exposure. REPRODUCTION AND POSITION OF LABELS ! Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check. WARNING LABEL 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 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) CLASS 1 LASER PRODUCT 1-6 (No.MA081) SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS. (No.MA081)1-7 SECTION 3 DISASSEMBLY 3.1Main body section 3.1.1Removing the front panel assembly (See Figs.1 and 2) (1) From the both side of the main body, remove the two screws A attaching the front panel assembly. (See Figs.1 and 2.) (2) Release the four joints a and remove the front panel as- sembly in the direction of the arrow. (See Figs.1 and 2.) Fig.1 Fig.2 Front panel assembly a A Front panel assembly a A 1-8 (No.MA081) 3.1.2Removing the heat sink (See Figs.3 and 4) (1) From the back side of the main body, remove the six screws B attaching the heat sink. (See Fig.3.) (2) Remove the heat sink from the main body. Note: Before attaching the heat sink, attach the cooling rubbers on the power amplifier IC. (See Fig.4) When attaching the heat sink, set the projections b on the rear bracket in the holes of the heat sink. (See Fig.3.) 3.1.3Removing the rear bracket (See Fig.4) Prior to performing the following procedures, remove the heat sink. (1) From the back side of the main body, remove the eight screws C attaching the rear bracket. (2) Remove the rear bracket from the main body. Fig.3 Fig.4 B B B bb Rear bracket heat sink C C C C Rear bracket Cooling rubbers Power amplifier IC (No.MA081)1-9 3.1.4Removing the bottom chassis assembly (See Fig.5) Prior to performing the following procedures, remove the front panel assembly, heat sink and rear bracket. (1) From the bottom side of the main body, remove the four screws D attaching the bottom chassis assembly. (2) Take out the bottom chassis assembly from the main body. Reference: When attaching the bottom chassis assembly, set the projec- tions c of the main body in the holes of the bottom chassis as- sembly. Fig.5 3.1.5Removing the mechanism control board (See Fig.6) Prior to performing the following procedures, remove the front panel assembly, heat sink, rear bracket and bottom chassis assembly. (1) From the inside of the bottom chassis assembly, discon- nect the card wire from the connector CN403 on the mech- anism control board. (2) Disconnect the wire from the connector CN402 on the mechanism control board. (3) Remove the three screws E attaching the mechanism con- trol board. (4) Take out the mechanism control board from the bottom chassis assembly. Reference: When attaching the mechanism control board, set the pro- jections d of the bottom chassis assembly in the holes of the mechanism control board. After attaching the mechanism control board, fix the wire with the wire clamp as before. Fig.6 Bottom chassis assembly c DD E E d d dCN403CN402 Wire clamp Mechanism control board Bottom chassis assembly 1-10 (No.MA081) 3.1.6Removing the cassette mechanism assembly (See Fig.7) Prior to performing the following procedures, remove the front panel assembly, heat sink, rear bracket and bottom chassis assembly. (1) From the inside of the bottom chassis assembly, discon- nect the card wire from the connector CN403 on the mech- anism control board. (2) Disconnect the wire from the connector CN402 on the mechanism control board. (3) Remove the four screws F attaching the cassette mecha- nism assembly. Reference: After attaching the mechanism control board, fix the wire with the wire clamp as before. Fig.7 3.1.7Removing the middle chassis assembly (See Fig.8) Prior to performing the following procedures, remove the front panel assembly, heat sink, rear bracket and bottom chassis assembly. (1) From the bottom side of the main body, remove the four screws G attaching the middle chassis assembly. (2) Disconnect the connector CN501 of the main board on the middle chassis assembly from the CD mechanism assem- bly in an upward direction. Fig.8 CN403 CN402 Wire clamp Mechanism control board Bottom chassis assemblyF F F Cassette mechanism assembly Main board Middle chassis assembly GG CN501 (No.MA081)1-11 3.1.8Removing the main board (See Fig.9) Prior to performing the following procedures, remove the front panel assembly, heat sink, rear bracket, bottom chassis as- sembly and middle chassis assembly. (1) From the top side of the middle chassis assembly, remove the four screws H attaching the main board on the middle chassis. (2) Remove the main board from the middle chassis. Reference: When attaching the main board, set the projections e of the middle chassis in the holes of the main board. Fig.9 3.1.9Removing the CD mechanism assembly (See Fig.10) Prior to performing the following procedures, remove the front panel assembly, heat sink, rear bracket, bottom chassis as- sembly and middle chassis assembly. (1) From the inside of the top chassis assembly, remove the three screws J attaching the CD mechanism assembly. (2) Take out the CD mechanism assembly from the top chas- sis. Reference: When attaching the CD mechanism assembly, set the projec- tions f of the top chassis in the holes of the CD mechanism as- sembly. Fig.10 3.1.10 Removing the LCD switch board (See Fig.11) Prior to performing the following procedures, remove the front panel assembly. (1) From the inside of front panel assembly, remove the ten screws K attaching the LCD switch board. (2) Release the sections g while extending the lower section of the front panel assembly in the direction of the arrow and take out the LCD switch board. Fig.11 Main board Middle chassis ee H H H JJ CD mechanism assembly Top chassis ff J K K K Front panel assembly LCD switch board g g 1-12 (No.MA081) 3.2CD Mechanism Assembly 3.2.1Removing the top cover (See Figs.1 and 2) (1) Remove the two screws A on the both side of the body. (2) Lift the front side of the top cover and move the top cover backward to release the two joints a. Fig.1 Fig.2 A A A Joints aTop cover Joints a Top cover (No.MA081)1-13 3.2.2Removing the connector board (See Figs.3 to 5) CAUTION: Before disconnecting the flexible wire from the pickup, solder the short-circuit point on the pickup. No observance of this in- struction may cause damage of the pickup. (1) Remove the screw B fixing the connector board. (2) Solder the short-circuit point on the connector board. (3) Disconnect the flexible wire from the pickup. (4) Move the connector board in the direction of the arrow to release the two joints b. (5) Unsolder the wire on the connector board if necessary. CAUTION: Unsolder the short-circuit point after reassembling. Fig.3 Fig.4 Fig.5 B Connector board PickupShort-circuit point Joints b Wires Pickup Short-circuit point (Soldering) Flexible wire B Flexible wire Connector board Frame 1-14 (No.MA081) 3.2.3Removing the DET switch (See Figs.6 and 7) (1) Extend the two tabs c of the feed sw. holder and pull out the switch. (2) Unsolder the DET switch wire if necessary. Fig.6 Fig.7 Connector board DET switch Pickup DET switch Tab c Tab c DET switch wire Feed sw. holder (No.MA081)1-15 3.2.4Removing the chassis unit (See Figs.8 and 9) Prior to performing the following procedure, remove the top cover and connector board. (1) Remove the two suspension springs (L) and (R) attaching the chassis unit to the frame. CAUTION: The shape of the suspension spring (L) and (R) are dif- ferent. Handle them with care. When reassembling, make sure that the three shafts on the underside of the chassis unit are inserted to the dampers certainly. Fig.8 Fig.9 Suspension spring (L) Suspension spring (L) Suspension spring (R) Suspension spring (R) Chassis unit Frame Chassis unit Frame Shafts Shaft Damper Damper Damper 1-16 (No.MA081) 3.2.5Removing the clamper assembly (See Figs.10 and 11) Prior to performing the following procedure, remove the top cover. (1) Remove the clamper arm spring. (2) Move the clamper assembly in the direction of the arrow to release the two joints d. Fig.10 Fig.11 Clamper arm spring Chassis rivet assembly Joint d Joint d Clamper assembly Clamper arm spring Clamper assembly Joint d Joint d Chassis rivet assembly (No.MA081)1-17 3.2.6Removing the loading / feed motor assembly (See Figs.12 and 13) Prior to performing the following procedure, remove the top cover, connector board and chassis unit. (1) Remove the screw C and move the loading / feed motor assembly in the direction of the arrow to remove it from the chassis rivet assembly. (2) Disconnect the wire from the loading / feed motor assembly if necessary. CAUTION: When reassembling, connect the wire from the