JVC-EXAK2DB-cs-sm维修电路原理图.pdf

SERVICE MANUAL COPYRIGHT 2008 Victor Company of Japan, Limited No.MB658 2008/3 COMPACT COMPONENT SYSTEM MB65820083 SERVICE MANUAL EX-AK2DB COPYRIGHT 2008 Victor Company of Japan, Limited Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade) Lead free solder used in the board (material : Sn-Cu, melting point : 230 Centigrade) TABLE OF CONTENTS 1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 2SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 3DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 4ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18 5TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23 RadioFans.CN 收音机爱 好者资料库 1-2 (No.MB658) SPECIFICATION EX-AK2DB Designs and Specifications are subject to change without notice. General Power source AC 230 V, 50 Hz Power consumption 24 W (in operation) 0.9 W (on standby) Mass 3.1kg External dimensions ( W H D)232 mm 100 mm 269 mm DVD player Playable discs/files DVD VIDEO, DVD AUDIO, DVD,VR, VCD, Super VCD, CD, CD-R/RW (CD, VCD, MP3, WMA, WAV,JPEG, MPEG1, MPEG2 format),DVD-R/RW (video format) Video output Color system PAL Horizontal resolution 500 lines Audio output Analog sound output Speakers 2 Output power (IEC 268-3) 60 W (30 W + 30 W) at 4 C (1 kHz/10% THD) Fitting impedance 4 to 16 Headphones 11 mW/32 Fitting impedance 16 to 1 k Subwoofer 500 mVrms/10 k Digital sound output Optical -21 dBm to -15 dBm Audio input Sound input AUX 1 Level 1 250 mV/50 k Level 2 500 mV/50 k Tuner (Digital Audio Broadcasting) Band III tuner Receiving Frequency: 5A (174.928) - 13F(239.200) MHz L-Band tuner Receiving Frequency: LA (1452.960) - LW(1490.624) MHz Speaker Type 1-way bass-reflex type Magnetically shielded type Speaker 8cm cone 1 Power handling capacity 30 W Impedance 4 Sound pressure level 81 dB/W?m Dimension (W H D) 120 mm 161 mm 239 mm Mass (1 unit) 1.7 kg RadioFans.CN 收音机爱 好者资料库 (No.MB658)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. 1-4 (No.MB658) 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 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) 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 pickup unit. Apply solder to the short land before the card wire is disconnected from the connector on the pickup unit. (If the card 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 after connecting the card wire. 1M (caption) Anti-static wrist strap Conductive material (conductive sheet) or iron plate Solder short land section (No.MB658)1-5 1.5Important for laser products 1.CLASS 1 LASER PRODUCT 2.CAUTION : (For U.S.A.) Visible and/or invisible class II laser radiation when open. Do not stare into beam. (Others) Visible and/or invisible class 1M laser radiation when open. Do not view directly with optical instruments. 3.CAUTION : Visible and/or invisible laser radiation when open and inter lock failed or defeated. Avoid direct exposure to beam. 4.CAUTION : This laser product uses visible and/or 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 and PRINT ! Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check. WARNING LABEL and PRINT 1-6 (No.MB658) SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS. SECTION 3 DISASSEMBLY 3.1Main body 3.1.1Removing the Top cover (See Fig 1, 2) (1) Remove the four screws A attaching the Top cover. (See Fig.1) (2) Takeout two washers B and two washers C on the Top cov- er. (See Fig.2) Fig.1 Fig.2 A A B C (No.MB658)1-7 3.1.2Removing the AL panel L and AL panel R (See Fig.3 to 5) (1) Remove the two screws D and two screws E attaching the Bridge A. (See Fig.3) (2) Remove the two screws F attaching the Bridge B. (See Fig.3) (3) Remove the two screws G and three screws H attaching the bridge C. (See Fig.3, 4) (4) Remove the two screws J attaching the AL panel L and AL panel R. (See Fig.3) (5) Remove the two screws K and six screws L attaching the AL panel L and AL panel R. (See Fig.5) Fig.3 Fig.4 Fig.5 D JJ E F E F GG H LL K 1-8 (No.MB658) 3.1.3Removing the Front panel (See Fig.6, 7) (1) Remove the two screws M attaching the Foot. (See Fig.6) (2) Remove the three screws N attaching the Foot. (See Fig.6) (3) Disengage two hooks a engaged both side of the Front panel. (See Fig.7) Fig.6 Fig.7 3.1.4Removing the Rear panel (with DAB tuner pack) (See Fig.8, 9) (1) Disconnect the card wire from DAB tuner pack connected to connector CN21 of the Micon board. (See Fig,8) (2) Remove the eleven screws P attaching the Rear panel. (See Fig.9) Fig.8 Fig.9 N M hook a CN21 P P (No.MB658)1-9 3.1.5Removing the Switching power supply unit (see Fig.10) (1) Disconnect the connector wire from Switching power sup- ply unit connected to connector CN201 of the Main board. (2) Remove the one screw Q attaching the Switching power supply unit. Fig.10 3.1.6Removing the Headphone board (See Fig.11) (1) Disconnect the connector wire from Main board connected to connector CN443 of the Headphone board. (2) Disconnect the earth wire from Bottom chassis connected to post pin TP401 of the Headphone board. (3) Remove the one screw R attaching the Headphone board. Fig.11 Q CN201 TP401 CN443 R 1-10 (No.MB658) 3.1.7Removing the Main board (See Fig.12 to 14) (1) Disconnect the card wire from Micon board connected to connector CN202 of the Main board. (See Fig.12) (2) Disconnect the card wire from DVD mechanism connected to connector CN206 of the Main board. (See Fig.12) (3) Disconnect the connector wires from Main board connect- ed to connector CN102 and CN103 of the Digital amp board. (See Fig.12) (4) Remove the three screws S attaching the Main board. (See Fig.12) (5) Disconnect the connector wires from Main board connect- ed to connector CN713 and CN714 of the Micon board. (See Fig.13) (6) Disconnect the Earth wire from bottom chassis connected to test point TP201 and TP204 of the Main board. (See Fig.14) Fig.12 Fig.13 Fig.14 SS S CN102 CN202 CN206 CN103 CN713 CN714 TP201 TP204 (No.MB658)1-11 3.1.8Removing the Micon board (See Fig.15) (1) Disconnect the connector wire from Micon board connect- ed to connector CN101 of the Digital amp board. (2) Disconnect the card wire from SCART board connected to connector CN711 of the Micon board. (3) Disconnect the card wire from Loader board connected to connector CN701 of the Micon board. (4) Disconnect the card wire from Front end board connected to connector CN708 of the Micon board. (5) Remove the two screws T attaching the Micon board. Fig.15 3.1.9Removing the Digital amp board (See Fig.16) (1) Disconnect the connector wire from Digital amp board con- nected to connector CN301 of the Speaker terminal board. (2) Remove the one screw U attaching the Digital amp board. Fig.16 TT CN711 CN701 CN708CN101 CN301 U 1-12 (No.MB658) 3.1.10 Removing the DVD mechanism (See Fig.17) (1) Remove the three screws V attaching the DVD mecha- nism. Fig.17 3.1.11 Removing the SCART board (See Fig.18) (1) Remove the one screw W attaching the SCART board. Fig.18 3.1.12 Removing the Speaker terminal board (See Fig.18) Remove the one screw X attaching the Speaker terminal board. 3.1.13 Removing the Front board (See Fig.19) (1) Remove the volume knob. (2) Remove the nine screws Y attaching the Front board. Fig.19 V VV WX Y Y (No.MB658)1-13 3.2DVD mechanism 3.2.1Removing the traverse mechanism (See Fig.1 to 6) (1) Remove the two screws A attaching the tramecha holder from top side of DVD mechanism assembly. (See Fig.1) (2) Remove the two screws B attaching the DVD module board. (See Fig.2) (3) Remove the four screws C attaching the CB holder and take out it. (See Fig.3) (4) Remove the four screws D attaching the traverse mecha- nism. (See Fig.4) (5) Solder the solder part of DVD pick up. (See Fig.5) (6) Disconnect the card wire from CN101 and CN201 on the DVD module board. (See Fig. 6) Caution: Solder the short land section on the DVD pickup before dis- connecting the card wire from the connector on the DVD pickup. If the card wire is disconnected without attaching sol- ders, the pickup may be destroyed by static electricity. When attaching the DVD pickup, be sure to remove solders from the short land section after connecting the card wire to the connector on the DVD pickup. Fig.1 Fig.2 A A Clamper base DVD mechanism assembly B B DVD module board DVD mechanism assembly 1-14 (No.MB658) Fig.3 Fig.4 Fig.5 Fig.6 CC C C DVD module board DD Traverse mechanism assembly DVD mechanism assembly Solder short land section CN101 CN201 DVD module board (No.MB658)1-15 3.2.2Removing the pickup assembly (See Fig.7 to 11) (1) Remove the two rod springs pressing the guide shaft. (See Fig.7) (2) Remove the screw E and F attaching the spring holder. (See Fig.8) (3) Remove the read screw from traverse mechanism assem- bly. (See Fig.9) Caution: When remove the lead screw, do not loss the middle gear. (See Fig.10 and 11) (4) Remove the bar spring pressing the shaft. (See Fig.10) (5) Take out the pickup assembly from traverse mechanism chassis by order. (See Fig.11) Fig.7 Fig.8 Fig.9 Fig.10 Fig.11 ROD SPRINGROD SPRING EF Spring holder Lead screw Middle gear (T.TABLE) HOOK (SHAFT) (BAR SPRING) order 1 order 2 order 3 1-16 (No.MB658) 3.2.3Removing the feed motor assembly (See Fig.12) (1) Remove the one screw G attaching the feed motor assem- bly. (2) Remove the feed motor wires from solder part of spindle motor board. Fig.12 3.2.4Removing the spindle motor assembly (See Fig.13) (1) Remove the three screws H attaching the spindle motor from spindle motor board. Fig.13 Lead screw Middle gear Solder part G Spindle motor H (No.MB658)1-17 3.2.5Removing the tray assembly (See Fig.14 & 15) (1) Remove the two screws J attaching the clamper base. (See Fig.14) (2) Remove the one screw K attaching the shaft guide from bottom side. (See Fig.14) (3) Remove the two screws L attaching the shaft guide from top side. (See Fig.15) Caution: When attach the tray assembly, boss of loading sub assembly should attach to guide of bottom side at tray assembly. (See Fig.15) Fig.14 Fig.15 J order 1 order 2 clamper base K bottom side L 1-18 (No.MB658) SECTION 4 ADJUSTMENT 4.1 ATTENTION IN SERVICE OF DVD SECTION (1) When pickup, Flash ROM ,DVD module board were changed, initialize EEPROM by all means. (2) When full initialization was executed, execute learning with a DVD test disc by all means. Test disc : VT-501, VT-502 Learning method : It is adjusted automatically by normal playback of a DVD disc. 4.2DVD TEST MODE 4.2.1Content of correspondence TEST MODE (1) Version, Region, Learning status check mode (2) NORMAL initialize, FULL initialize (3) Device key checksum indication mode (4) Micon version indication mode (5) FL all on mode (6) FRONT END check mode 4.2.2Mode transition TEST MODE into the press PLAY key and STOP key together of main body, connect the AC power. After into the TEST MODE, mode select by MENU key. (*1): Change form Version, Region, Learning status indication mode to NORMAL initialize, FULL initialize is effective only main body key. The following keys are allocated when there are neither | key nor |<| key(*1)|<< key(*1) STOP key 4sec long press(*1) STEPOperationMovementRemarksFL(LCD)indication J C # 132 132 4657 8 1 Version indication The display to the version code is as follows. JC, 1U, D, E 2U, 3U, UB, UT 4U, UY, EE, UF Region indication (# part) Learning and Initialization from the back end is displayed in the second line( ) of the FL display. Blank indication at 0 xFF AC is pulled out, and double press PLAY and STOP key of the main body 2Keep step 1, connect AC Version, Region, Learning status indication mode Power on by test mode, version indication to FL T E S T (No.MB658)1-19 Learning status (first digit) BCA CHECK OK incomplete, DVD learning incomplete, CD