JVC EX-AK2DB Service Manual Download Page 3

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(No.MB658<Rev.001>)1-3

SECTION 1

PRECAUTION

1.1

Safety 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.

Summary of Contents for EX-AK2DB

Page 1: ... 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 1 PRECAUTION 1 3 2 SPECIFIC SERVICE INSTRUCTIONS 1 6 3 DISASSEMBLY 1 6 4 ADJUSTMENT 1 18 5 TROUBLESHOOTING 1 23 ...

Page 2: ...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 Ω to 16Ω Headphones 11 mW 32 Ω Fitting impedance 16 Ω to 1 kΩ Subwoofer 500 mVrms 10 kΩ Digital sound output Optical 21 dBm to 15 dBm Audio input Sound input AUX 1 Level 1 250 mV 50 kΩ Level 2 500 mV 50 kΩ Tuner Digital Audio Broadcasting Band III tuner Receiving Frequency 5A 174 928 13F 23...

Page 3: ...urrs 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 ...

Page 4: ...to check the condition of the laser diode in the optical pickup The tester s internal power source can easily destroy the laser diode 1 3 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 deta...

Page 5: ...oduct 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 th...

Page 6: ...ual does not describe SPECIFIC SERVICE INSTRUCTIONS SECTION 3 DISASSEMBLY 3 1 Main body 3 1 1 Removing 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 ...

Page 7: ...g 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 J J E F E F G G H L L K ...

Page 8: ...e 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 4 Removing 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 ...

Page 9: ...move the one screw Q attaching the Switching power supply unit Fig 10 3 1 6 Removing 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 ...

Page 10: ...t 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 boa...

Page 11: ...re 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 9 Removing 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 ...

Page 12: ...ing 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 V V W X Y Y ...

Page 13: ...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...

Page 14: ...1 14 No MB658 Rev 001 Fig 3 Fig 4 Fig 5 Fig 6 C C C C DVD module board D D Traverse mechanism assembly DVD mechanism assembly Solder short land section CN101 CN201 DVD module board ...

Page 15: ...ad 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 SPRING ROD SPRING E F Spring holder Lead screw Middle gear T TABLE HOOK SHAFT BAR SPRING orde...

Page 16: ...aching the feed motor assem bly 2 Remove the feed motor wires from solder part of spindle motor board Fig 12 3 2 4 Removing 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 ...

Page 17: ...e 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 ...

Page 18: ...be allocated by the set it is assumed it is arbitrary 4 2 3 Processing details The communication of operated FL LCD display and DVD back end microcomputer is shown as follows It is assumed to be OK to differ from the content of the specification because the number of digits is different according to the set for the FL LCD display It is assumed to be OK to differ from the content of the specificati...

Page 19: ...complete indication 0 Initialize incomplete blank indication The AVC protocol is returned from high speed to normal speed Return it to the normal mode when coming off the TEST mode Indicate CHECKSUM to FL 3 Press a MENU key of the remote controller DEVICE CHECKSUM indication mode Indicate the CHECKSUM of the Device key to FL 4 byte Press a MENU key of the remote controller FL all on mode All FL an...

Page 20: ...63 indication FWD B U P Upper 0 Lower Temperature sensor value Press a 9 key of the remote controller Temperature sensor AD value indication T M P Upper 0x00 0x06 measure at VT501 Lower Jitter value Press a 10 key of the remote controller DVD DL parallel opposite Search jitter measurement of the specified position of DVD SL D L Upper 0x00 0x0C Lower 0 Press a 0 key of the remote controller MONITOR...

Page 21: ...ST MODE Release at each step E T S T J C STEP Operation Movement Remarks FL LCD indication 1 3 2 1 3 2 4 6 5 7 8 Upper Laser current value BACKUP value Real measured value Lower Jitter value Press a PLAY key of the main body or remote controller Disc playback C H E C K Press a OPEN CLOSE key of the main body or remote controller Tray Open Close Press a STOP key of the main body or remote controlle...

Page 22: ...R 10 and STOP POWER 10 Normal mode Normal mode Release the TEST MODE COLD START Temperature indication mode Model name Destination confirmation mode Version confirmation mode 1 Syscon ROMCOLLE version Version confirmation mode 2 Back end version Version confirmation mode 3 DVD unit destination REGION CODE Version confirmation mode 4 DVD module information Version confirmation mode 5 DAB module ver...

Page 23: ...ther 3 Press STOP 10 keep this state version indication is replaced whenever press POWER key Mode change to version confirmation mode 5 DAB module version press UPPER key of remote controller to shift the DAB test mode SECTION 5 TROUBLESHOOTING This service manual does not describe TROUBLESHOOTING ...

Page 24: ... No MB658 Rev 001 VPT Printed in Japan Victor Company of Japan Limited Audio Video Systems category 10 1 1chome Ohwatari machi Maebashi city 371 8543 Japan ...

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