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JVC DX-T9 Service Manual
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JVC DX-T9 Service Manual

JVC DX-T9 Service Manual

Jvc compact component system service manual
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SERVICE MANUAL
COMPACT COMPONENT SYSTEM
5
2005
MB368
DX-T9,DX-T7,DX-T5
(CA-DXT7,CA-DXT9)
DX-T9
DX-T7
DX-T5
Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-51
5
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-61
(SP-XST5)
(SP-XT5)
(CA-DXT5)
Main body
Front speaker
Subwoofer
CA-DXT9
SP-XT9
SP-WT9
CA-DXT7
SP-XT7
SP-WT7
CA-DXT5
SP-XT5
TABLE OF CONTENTS
COPYRIGHT © 2005 Victor Company of Japan, Limited
(SP-XT5)
(SP-XST5)
Surround speaker
Center speaker
SP-XST9
SP-XCT9
SP-XST7
SP-XCT7
---
SP-XST5
SP-XCT5
DX-T9, DX-T7
Area suffix
A
------------------------
Australia
US ------------------------ Singapore
UW ----------- Brazil,Mexico,Peru
UX -------------------- Saudi Arabia
UG --- Turkey,South Africa,Egypt
UN ----------------------------- Asean
DX-T5
Area suffix
US ------------------------ Singapore
UW ----------- Brazil,Mexico,Peru
UX -------------------- Saudi Arabia
UY ------------------------ Argentina
UG --- Turkey,South Africa,Egypt
UN ----------------------------- Asean
No.MB368
2005/5

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Summary of Contents for JVC DX-T9

  • Page 1 SERVICE MANUAL COMPACT COMPONENT SYSTEM MB368 2005 DX-T9,DX-T7,DX-T5 DX-T9, DX-T7 Area suffix ------------------------ Australia US ------------------------ Singapore UW ----------- Brazil,Mexico,Peru UX -------------------- Saudi Arabia UG --- Turkey,South Africa,Egypt UN ----------------------------- Asean DX-T5 Area suffix US ------------------------ Singapore UW ----------- Brazil,Mexico,Peru...
  • Page 2 SPECIFICATION CA-DXT9 Amplifier section Output Power FRONT SPEAKERS 150 W per channel, min. RMS, driven into 4 at 1 kHz with no more than 10% total harmonic distortion. CENTER SPEAKER 140 W per channel, min. RMS, driven into 6 at 1 kHz with no more than 10% total harmonic distortion.
  • Page 3 CA-DXT7 Amplifier section Output Power FRONT SPEAKERS 150 W per channel, min. RMS, driven into 4 at 1 kHz with no more than 10% total harmonic distortion. CENTER SPEAKER 50 W per channel, min. RMS, driven into 6 at 1 kHz with no more than 10% total harmonic distortion.
  • Page 4 DX-T5 Amplifier section Output Power MAIN SPEAKERS 150 W per channel, min. RMS, driven into 4 at 1 kHz with no more than 10% total harmonic distortion. Digital output OPTICAL DIGITAL OUTPUT -21 dBm to -15 dBm (660 nm ±30 nm) Audio input sensitivity/ 300 mV/47 k Impedance*1...
  • Page 5 Speakers Main Speakers Type 3-Way 3-Speaker Bass Reflex (Magnetically-Shielded Type) Speaker systems Woofer 18 cm cone 5 cm cone Tweeter 2 cm dome Power handling capacity 150 W Impedance Frequency range 37 Hz - 31 000 Hz Sound pressure level 85 dB/W·m Dimensions (W/H/D) (approx.) 204 mm 460 mm...

  • Page 6: Precaution

    SECTION 1 PRECAUTION Safety Precautions (1) This design of this product contains special hardware and voltmeter. many circuits and components specially for safety purpos- Move the resistor connection to each exposed metal es. For continued protection, no changes should be made part, particularly any exposed metal part having a return to the original design unless authorized in writing by the path to the chassis, and measure the AC voltage across...
  • Page 7 Preventing 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. 1.5.1 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.

  • Page 8: Important For Laser Products

    Important for laser products 5.CAUTION : If safety switches malfunction, the laser is able 1.CLASS 1 LASER PRODUCT to function. 2.DANGER : Invisible laser radiation when open and inter 6.CAUTION : Use of controls, adjustments or performance of lock failed or defeated. Avoid direct exposure to beam. procedures other than those specified here in may result in 3.CAUTION : There are no serviceable parts inside the hazardous radiation exposure.

  • Page 9: Specific Service Instructions

    SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS. (No.MB368)1-9...

  • Page 10: Disassembly

    SECTION 3 DISASSEMBLY Main body section 3.1.1 Removing the metal cover (See Figs.1 to 3) (1) From the both sides of the main body, remove the six Metal cover screws A attaching the metal cover. (See Figs.1 and 2.) (2) From the back side of the main body, remove the eight screws B attaching the metal cover.
  • Page 11 3.1.2 Removing the front panel assembly (See Figs.4 to 6) • Remove the metal cover. Main board Front panel assembly (1) From the right side of the main body, disconnect the card wire from the connectors CN740 on the reverse side of the CN730 CN720 main board.
  • Page 12 3.1.3 Removing the tuner (See Fig.7) • Remove the metal cover. Rear panel Tuner (1) From the back side of the main body, remove the two screws E attaching the tuner to the rear panel. (2) Take out the tuner from the main body and disconnect the card wire from the connector on the tuner.
  • Page 13 (1) From the left side of the main body, disconnect the card wires from the connectors (CN800, CN810) on the main board. (See Fig.8.) [For DX-T9, DX-T7] (2) From the left side of the main body, disconnect the card wires from the connector CN800 on the main board.
  • Page 14 3.1.5 Removing the video board (See Figs.11 and 12.) • Remove the metal cover and DVD changer mechanism as- sembly . Video board (1) From the back side of the main body, remove the four screws G attaching the video board to the rear panel. (See Fig.11.) (2) From the top side of the main body, disconnect the card wires from the connectors (CN920, CN931) on the video...
  • Page 15 CN304 on the amplifier 2 board. (See Fig.14.) [For DX-T9, DX-T5] (3) Remove the joints d and remove the rear cover. (See Fig.13.)From the left side of the main body, disconnect the wire from the connector CN604 on the amplifier 2 board.
  • Page 16 [DX-T9, DX-T7] Rear panel (1) Remove the two screws J and eighteen screws K attaching the rear panel. [For DX-T9, DX-T7] (2) Remove the two screws J and seventeen screws K attach- ing the rear panel. [For DX-T5] (3) Release the sections f of the rear panel and remove the joints g of the mecha chassis in the direction of the arrow.
  • Page 17 (CN720, CN730, CN740, CN760, CN760 CN800, CN810, CN820, CN830) on the forward side of the main board. [For DX-T9, DX-T7] (3) From the inside of the main body, disconnect the card wires CN820 from the connectors (CN720, CN730, CN740, CN760,...
  • Page 18 3.1.9 Removing the amplifier 1 and amplifier 2 boards 3.1.11 Removing the amplifier 1 and amplifier 2 boards (See Fig.17 to 19) [For DX-T9] (See Fig.17 to 19) [For DX-T5] • Remove the metal cover, tuner, fan, rear panel and main •...
  • Page 19 [DX-T9] Bridge board Amplifier 2 board Amplifier 1 board Amplifier 2 board Heat sink Leaf spring [DX-T7] Earth wires Amplifier 1 board Amplifier 2 board Bottom chassis CN200 Spacer Bridge board Fig.17 CN303 (CN603) Amplifier 1 board Leaf spring Heat sink...
  • Page 20 3.1.12 Removing the primary board (See Fig.20) • Remove the metal cover, tuner, fan, rear panel, main board, amplifier 1 board and amplifier 2 board. Bridge board (1) From the left side of the main body, remove the screw Q Lock and screw R attaching the primary board.
  • Page 21 3.1.14 Removing the surround terminal board (See Fig.22.) [For Dx-T9, DX-T7] • Remove the metal cover, tuner, fan, rear panel, main board, Power transformer Bottom chassis amplifier 1 board, amplifier 2 board, primary board and bridge board. (1) Remove the screw T attaching the surround terminal board on the bottom chassis.
  • Page 22 3.1.17 Removing the cassette A mechanism assembly (See Fig.24) • Remove the metal cover and front panel assembly. Cassette A mechanism assembly (1) From the inside of the front panel assembly, remove the four screws W and screw X attaching the cassette A mech- anism assembly.
  • Page 23 3.1.19 Removing the microphone amplifier board (See Figs.26 and 27) • Remove the metal cover, front panel assembly and cassette B Front panel assembly mechanism assembly. (1) From the front side of the front panel assembly, pull out the microphone volume knob. (See Fig.26.) (2) From the inside of the front panel assembly, remove the two screws Y and remove the support 1 board.
  • Page 24 DVD changer mechanism assembly section Remove the DVD changer mechanism assembly from the main body. (See "Removing the DVD changer mechanism assembly".) 3.2.1 Removing the tray assemblies (See Figs.1 to 5) (1) From the top side of the main body, remove the two screws Top cover A from the top cover and release the two joints a on the both sides of the DVD changer mechanism assembly.
  • Page 25 Open det. lever Fig.3 Side(R) assembly Tray assemblies Fig.4 Tray assembly Fig.5 (No.MB368)1-25...
  • Page 26 3.2.2 Removing the DVD servo board (See Figs.6 to 8) Caution: Solder the short land sections d on the DVD pickup before dis- connecting the card wire extending from the DVD pickup. If you do not follow this instruction, the DVD pickup may be dam- DVD pickup aged.
  • Page 27 3.2.4 Removing the motor board (See Figs.9 and 10) (1) From the top side of the DVD changer mechanism assem- bly, remove the two belts from the motor pulleys. (See Fig.9.) Note: Take care not to attach grease on the belt. Belt Belt (2) Remove the two screws D attaching the motors to the load-...
  • Page 28 3.2.6 Removing the DVD traverse mechanism assembly (See Fig.11) • Remove the tray assemblies and DVD servo board. DVD changer mechanism assembly (1) From the bottom side of the DVD changer mechanism as- sembly, remove the three screws F attaching the DVD traverse mechanism assembly.
  • Page 29 3.2.7 Removing the DVD pickup (See Figs.12 to 14) • Remove the tray assemblies, DVD servo board and DVD DVD traverse mechanism assembly traverse mechanism assembly. Feed bracket (1) From the top side of the DVD traverse mechanism assem- Thrust spring bly, release the lock of the connector on the DVD pickup Connector and disconnect the card wire in the direction of the arrow.
  • Page 30 DVD pickup Rack arm Guide shaft Rack arm spring Fig.14 Connector DVD pickup Screw shaft gear Fig.15 1-30 (No.MB368)
  • Page 31 3.2.9 Removing the spindle motor board (See Figs.16 and 17) • Remove the tray assemblies, DVD servo board and DVD DVD traverse mechanism assembly traverse mechanism assembly. (1) From the top side of the DVD traverse mechanism assem- Spindle motor board bly, remove the wires from the soldered sections r on the spindle motor board.
  • Page 32 3.2.10 Removing the feed motor (See Figs.18 and 19) • Remove the tray assemblies and DVD traverse mechanism Feed bracket assembly. (1) From the top side of the DVD traverse mechanism assem- Thrust spring bly, remove the screw K attaching the feed bracket and re- move the feed bracket from the sections t.
  • Page 33 3.2.11 Removing the side (L) and tray switch board (See Figs.20 to 22) • Remove the tray assemblies. SIde(L) (1) From the topside of the DVD changer mechanism assem- bly, remove the two screws M attaching the side (L). (See Fig.20.) (2) From the left side of the DVD changer mechanism assem- bly, disconnect the connector...
  • Page 34 3.2.12 Removing the side (R) assembly (See Fig.23 to 27) • Remove the tray assemblies and DVD servo board. Elevator spring (1) From the inside of the side (R) assembly, release the two tabs aa of the gear cover and remove the gear cover out- ward.
  • Page 35 3.2.13 Removing the lifter assembly (See Figs.28 to 32) • Remove the tray assemblies, DVD servo board, side (L) and Hook side (R) assembly. (1) (1) From the top side of the DVD changer mechanism as- sembly, turn the gear 1 clockwise to move the lifter assem- bly upward.
  • Page 36 3.2.14 Removing the sensor board and SV resistor (See Fig.33) • Remove the tray assemblies, side (L), side (R) assembly and Sensor board lifter assembly. (1) Remove the solders from the soldered sections aj on the sensor board and remove the wires. (2) Remove the two screws Q and take out the sensor board with the SV resistor.
  • Page 37 3.2.15 Taking out the disc in the play mode (See Fig.34 to 37) Reference: Tray assembly Refer to "3.3.1 Removing the tray assemblies". (1) From the top side of the DVD changer mechanism assem- bly, remove the top cover. (2) Unlock the tray assemblies and draw out the tray assem- blies toward the front.
  • Page 38 Tray stopper Main tray Sub tray Fig.36 Tray stopper Fig.37 1-38 (No.MB368)
  • Page 39 Cassette mechanism assembly [A MECHA] 3.3.1 Removing the Play head (See Fig.1 to 3) (1) While moving the trigger arm on the right side of the head mount in the direction of the arrow, turn the flywheel R Cassette mechanism assembly counterclockwise until the head mount comes ahead and Fly wheel R clicks.
  • Page 40 3.3.2 Removing the head amplifier board (See Fig.4) (1) Turn over the cassette mechanism assembly and remove the three screws A attaching the head amplifier board. Main motor assembly (2) (2) Disconnect the flexible wire from connector on the head amplifier board. (3) Disconnect connector CN41 of the head amplifier board...
  • Page 41 3.3.4 Removing the flywheel (See Fig.8, 9) • Prior to performing the following procedure, remove the head amplifier board and the main motor assembly. (1) From the front side of the cassette mechanism, remove the slit washers attaching the capstan shaft L and R. (2) Pull out the flywheels backward.
  • Page 42 3.3.6 Reattaching the Play head (See Fig.11 to 13) (1) Reattaching the head mount assembly. a) Change front of the direction cover of the head mount assembly to the left (Turn the head forward). b) Fit the bosses O', P', Q', U' and V' on the head mount assembly to the holes P and V, the slots O, U and Q of the mechanism sub assembly (See Fig.11 to 13).
  • Page 43 Cassette mechanism assembly [B MECHA] 3.4.1 Removing the Play/Record & Clear head Cassette mechanism assembly Fly wheelR (See Fig.1~3) (1) While moving the trigger arm on the right side of the head mount in the direction of the arrow, turn the flywheel R counterclockwise until the head mount comes ahead and clicks.
  • Page 44 3.4.2 Removing the head amplifier & mechanism control board (See Fig.4) (1) Turn over the cassette mechanism assembly and remove Main motor assembly the three screws A attaching the head amplifier & mecha- nism control board. Capstan belt (2) Disconnect the flexible wire from connector CN31 on the head amplifier &...
  • Page 45 3.4.4 Removing the flywheel (See Fig.8, 9) • Prior to performing the following procedure, remove the head amplifier & mechanism control board and the main motor as- sembly. (1) From the front side of the cassette mechanism, remove the slit washers attaching the capstan shaft L and R. Pull out the flywheels backward.
  • Page 46 3.4.6 Reattaching the Play/ Record & Clear head (See Fig.11~13) (1) Reattaching the head mount assembly. a) Change front of the direction cover of the head mount assembly to the left (Turn the head forward). b) Fit the bosses O', P', Q', U' and V' on the head mount assembly to the holes P and V, the slots O, U and Q of the mechanism sub assembly (See Fig.11 to 13).
  • Page 47 Speaker section 3.5.1 Removing the speaker net assembly (See Fig.1) From the front side of the speaker main body, remove the sec- Speaker net assembly tions a of the speaker net assembly toward this side. Fig.1 (No.MB368)1-47...
  • Page 48 3.5.2 Removing the front panel assembly (See Figs.2 and 3) • Remove the speaker net assembly as required. Front panel assembly (1) Insert the tip of a flat-bladed screwdriver or similar tool into the space between the speaker main body and front panel assembly, and lift the front panel assembly little by little to remove the sections b.
  • Page 49 3.5.3 Removing the speaker (See Fig.4) • Remove the front panel assembly. Speaker (1) From the front side of the speaker main body, remove the four screws A attaching the speaker. (2) Take out the speaker from the speaker main body and dis- connect the wires from the terminal on the back side of the speaker.
  • Page 50 Subwoofer section (For DX-T9, DX-T7) 3.6.1 Removing the front panel assembly (See Fig.1) Insert the tip of a flat-bladed screwdriver or similar tool into the Front panel assembly space between the subwoofer main body and front panel assem- bly, and lift the front panel assembly little by little to remove the sections a.

  • Page 51: Adjustment

    SECTION 4 ADJUSTMENT Adjustment method 4.1.1 Measurement Instruments Required for Adjustment 4.1.4 Tuner section (1) Low frequency oscillator FM Band cover: 87.5 - 108.0MHz This oscillator should have a capacity to output 0dBs to AM Band cover: 531 - 1,710kHz (at 9kHz) 600 at an oscillation frequency of 50Hz-20kHz.
  • Page 52 Cassette mechanism adjustment Head azimuth Head azimuth adjustment screw adjustment screw (Forward side) (Reverse side) CN48 PB head (A cassette) Head azimuth Head azimuth adjustment screw adjustment screw Head azimuth Head azimuth (Forward side) (Reverse side) adjustment screw adjustment screw (Forward side) (Reverse side) CN31...
  • Page 53 4.2.1 Mechanism section Adjustment Item Condition Measurement method Ref.value position Only adjust Head Test tape 1. Playback the test tape VT703L (8kHz). Maximum at changed azimuth : VT703L (8kHz) 2. Adjust to maximum output level by azimuth output head Output terminal adjustment screw for forward side and reverse : Speaker out side.
  • Page 54 4.2.2 Electrical adjustment Adjustment Item Condition Measurement method Ref.value position AC-225 Recording VR31 1. Set the test tape(AC-514 TYPE Forward or Reverse :4.20uA BIAS Test tape AC-225 TYPE ), then make REC/PAUSE AC-514 adjustment :AC-514 TYPE condition. :4.0uA :AC-225 TYPE 2.
  • Page 55 Service mode 4.3.1 Confirming contents (1) Tuner AM switch to 9kHz-step (2) Tuner AM switch to 10kHz-step (3) Tray lock (4) Cold start (5) Clock fast forwarding (6) Compulsion NTSC mode (7) Fan ON/OFF setting (8) Volume large step change (9) Micon version display (10) LCD all segment blinking (11) Tuner version...
  • Page 56 4. Cold start 7. Fan ON/OFF setting Cold start processing. Toggle between FAN switch ON and OFF. After cold start is activated, LCD 8 Segment temporary ( FAN-CTL : L H TOGGLE ) display 'COLD' for 2 seconds. Then return to previous This test mode is only effective during STANDBY MODE.
  • Page 57 9. Micon version display 11. Tuner version TEMPORARY DISPLAY FOR MICON VERSION (5SEC) Each Key pressed will display the current Sys-con After 5 seconds, return to previous display. Tuner Version for 5 seconds and then changed back Each key press will toggle temporary display for the to previous display.
  • Page 58 14. DVD region confirm mode Into the DVD region confirm mode. DVD REGION CHECK CAN ONLY BEEN DISPLAY DURING SYSTEM POWER ON IN DVD MODE (WHEN DVD LSI P.ON) Temporary display region code on LCD for 5 seconds. IF THERE IS NO INFORMATION FEEDBACK, SYS-CON WILL DISPLAY "WAIT"...
  • Page 59 4. DVD check mode DVD test mode Press the [MENU] key on the remote controller . FL indication " CHECK " START PLAYBACK Press the [1] key on FL indication the remote controller . " PLAYBACK " (After 2 seconds) Perform SEARCH TNO+1 Press the [2] key on FL indication...
  • Page 60 Perform monitor output. (After 2 seconds) Press the [0] key on FL indication FL indication the remote controller . "MONITOR" "xxxxyyyy" Initialize EEPROM (MECHA) Press the [+10] key on FL indication the remote controller . "INIT" Start PLAYING and obtain LASER CURRENT and JITTER value.

  • Page 61: Troubleshooting

    SECTION 5 TROUBLESHOOTING This service manual does not describe TROUBLESHOOTING. (No.MB368)1-61...
  • Page 62 Victor Company of Japan, Limited AV & MULTIMEDIA COMPANY AUDIO/VIDEO SYSTEMS CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan (No.MB368) Printed in Japan...

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