JVC DX-T9 User manual

SERVICE MANUAL
COPYRIGHT © 2005 Victor Company of Japan, Limited No.MB368
2005/5
COMPACT COMPONENT SYSTEM
MB36820055
DX-T9,DX-T7,DX-T5
Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-51
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-61
(CA-DXT5) (SP-XST5)(SP-XT5) (SP-XT5)(SP-XST5)(CA-DXT7,CA-DXT9)
DX-T9, DX-T7
Area suffix
A ------------------------ Australia
US ------------------------ Singapore
UW ----------- Brazil,Mexico,Peru
UX -------------------- Saudi Arabia
UG --- Turkey,South Africa,Egypt
UN ----------------------------- Asean
US ------------------------ Singapore
UW ----------- Brazil,Mexico,Peru
UX -------------------- Saudi Arabia
UY ------------------------ Argentina
UG --- Turkey,South Africa,Egypt
UN ----------------------------- Asean
DX-T5
Area suffix
DX-T9
DX-T7
DX-T5
Main body
CA-DXT9
CA-DXT7
CA-DXT5
Front speaker
SP-XT9
SP-XT7
SP-XT5
Subwoofer
SP-WT9
SP-WT7
---
Surround speaker
SP-XST9
SP-XST7
SP-XST5
Center speaker
SP-XCT9
SP-XCT7
SP-XCT5

1-2 (No.MB368)
SPECIFICATION
CA-DXT9
*1: Measured at 1 kHz, with tape recording signal 300 mV
Amplifier section Output Power FRONT SPEAKERS 150 W per channel, min. RMS, driven into 4 Ωat 1 kHz
with no more than 10% total harmonic distortion.
CENTER SPEAKER 140 W per channel, min. RMS, driven into 6 Ωat 1 kHz
with no more than 10% total harmonic distortion.
SURROUND SPEAKERS 140 W per channel, min. RMS, driven into 6 Ωat 1 kHz
with no more than 10% total harmonic distortion.
SUBWOOFERS 150 W per channel, min. RMS, driven into 4 Ωat 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/
Impedance*1
AUX 300 mV/47 kΩ
MIC 1/2 3.0 mV/50 kΩ
VIDEO OUT Color system NTSC/PAL selectable
VIDEO (composite) 1 V(p-p)/75 Ω
S-VIDEO Y (luminance):1 V(p-p)/75 Ω
C (chrominance, burst):0.286 V(p-p)/75 Ω
COMPONENT (Interlace/Progressive) (Y):1 V(p-p)/75 Ω
(PB/PR):0.7 V(p-p)/75 Ω
Speaker Terminals 4 Ω- 16 Ω(front speakers/subwoofers)
6 Ω- 16 Ω(surround/center speakers)
Tuner section FM tuning range 87.50 MHz - 108.00 MHz
AM (MW) tuning range 531 kHz - 1 602 kHz (at 9 kHz)
530 kHz - 1 600 kHz (at 10 kHz)
Disc player section Playable disc DVD Video/DVD Audio/CD/VCD/SVCD
CD-R/CD-RW (recorded in Audio CD/Video CD/Super
Video CD formats and MP3/WMA/JPEG files)
DVD-R (recorded in DVD Video format)
DVD-RW (recorded in DVD Video format or DVD-VR
format)
DVD-RAM (recorded in DVD-VR format)
Dynamic range 80 dB
Horizontal resolution 500 lines
Wow and flutter Immeasurable
Cassette deck section Frequency response Normal (type I) 50 Hz - 14 000 Hz
Wow and flutter 0.15% (WRMS)
General Power requirement AC 110 V / AC 127 V / AC 220 V / AC 230 V - AC 240
V , (adjustable with the voltage selector), 50 Hz / 60 Hz
Power consumption 335 W (at operation)
29 W (on standby)
Dimensions (W/H/D) (approx.) 185 mm ×460 mm ×361 mm
Mass (approx.) 11.4 kg

(No.MB368)1-3
CA-DXT7
*1: Measured at 1 kHz, with tape recording signal 300 mV
Amplifier section Output Power FRONT SPEAKERS 150 W per channel, min. RMS, driven into 4 Ωat 1 kHz
with no more than 10% total harmonic distortion.
CENTER SPEAKER 50 W per channel, min. RMS, driven into 6 Ωat 1 kHz
with no more than 10% total harmonic distortion.
SURROUND SPEAKERS 50 W per channel, min. RMS, driven into 6 Ωat 1 kHz
with no more than 10% total harmonic distortion.
SUBWOOFERS 150 W per channel, min. RMS, driven into 4 Ωat 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/
Impedance*1
AUX 300 mV/47 kΩ
MIC 1/2 3.0 mV/50 kΩ
VIDEO OUT Color system NTSC/PAL selectable
VIDEO (composite) 1 V(p-p)/75 Ω
S-VIDEO Y (luminance):1 V(p-p)/75 Ω
C (chrominance, burst):0.286 V(p-p)/75 Ω
COMPONENT (Interlace/Progressive) (Y):1 V(p-p)/75 Ω
(PB/PR):0.7 V(p-p)/75 Ω
Speaker Terminals 4 Ω- 16 Ω(front speakers/subwoofers)
6 Ω- 16 Ω(surround/center speakers)
Tuner section FM tuning range 87.50 MHz - 108.00 MHz
AM (MW) tuning range 531 kHz - 1 602 kHz (at 9 kHz)
530 kHz - 1 600 kHz (at 10 kHz)
Disc player section Playable disc DVD Video/DVD Audio/CD/VCD/SVCD
CD-R/CD-RW (recorded in Audio CD/Video CD/Super
Video CD formats and MP3/WMA/JPEG files)
DVD-R (recorded in DVD Video format)
DVD-RW (recorded in DVD Video format or DVD-VR
format)
DVD-RAM (recorded in DVD-VR format)
Dynamic range 80 dB
Horizontal resolution 500 lines
Wow and flutter Immeasurable
Cassette deck section Frequency response Normal (type l) 50 Hz - 14 000 Hz
Wow and flutter 0.15% (WRMS)
General Power requirement AC 110 V / AC 127 V / AC 220 V / AC 230 V - AC 240
V , (adjustable with the voltage selector), 50 Hz / 60 Hz
Power consumption 270 W (at operation)
25 W (on standby)
Dimensions (W/H/D) (approx.) 185 mm ×460 mm ×361 mm
Mass (approx.) 11.4 kg

1-4 (No.MB368)
DX-T5
*1: Measured at 1 kHz, with tape recording signal 300 mV
Amplifier section Output Power MAIN SPEAKERS 150 W per channel, min. RMS, driven into 4 Ωat 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/
Impedance*1
AUX 300 mV/47 kΩ
MIC 1/2 3.0 mV/50 kΩ
VIDEO OUT Color system NTSC/PAL selectable
VIDEO (composite) 1 V(p-p)/75 Ω
S-VIDEO Y (luminance):1 V(p-p)/75 Ω
C (chrominance, burst):0.286 V(p-p)/75 Ω
COMPONENT (Interlace/Progressive) (Y):1 V(p-p)/75 Ω
(PB/PR):0.7 V(p-p)/75 Ω
Speaker Terminals 4 Ω- 16 Ω(Main speakers)
6 Ω- 16 Ω(Surround speakers)
Tuner section FM tuning range 87.50 MHz - 108.00 MHz
AM (MW) tuning range 531 kHz - 1 710 kHz (at 9 kHz)
530 kHz - 1 710 kHz (at 10 kHz)
Disc player section Playable disc DVD Video/DVD Audio/CD/VCD/SVCD
CD-R/CD-RW (recorded in Audio CD/Video CD/Super
Video CD formats and MP3/WMA/JPEG files)
DVD-R (recorded in DVD Video format)
DVD-RW (recorded in DVD Video format or DVD-VR
format)
DVD-RAM (recorded in DVD-VR format)
Dynamic range 80 dB
Horizontal resolution 500 lines
Wow and flutter Immeasurable
Cassette deck section Frequency response Normal (type I) 50 Hz - 14 000 Hz
Wow and flutter 0.15% (WRMS)
General Power requirement AC 110 V / AC 127 V / AC 220 V / AC 230 V - AC 240
V , (adjustable with the voltage selector), 50 Hz / 60 Hz
Power consumption 195 W (at operation)
20 W (on standby)
Dimensions (W/H/D) (approx.) 185 mm ×460 mm ×361 mm
Mass (approx.) 10.9 kg

(No.MB368)1-5
Speakers
Design and specifications are subject to change without notice.
Main Speakers Type 3-Way 3-Speaker Bass Reflex (Magnetically-Shielded Type)
Speaker systems Woofer 18 cm cone ×1
Mid 5 cm cone ×1
Tweeter 2 cm dome ×1
Power handling capacity 150 W
Impedance 4 Ω
Frequency range 37 Hz - 31 000 Hz
Sound pressure level 85 dB/W·m
Dimensions (W/H/D) (approx.) 204 mm ×460 mm ×271 mm
Mass (approx.) 4.6 kg each
Surround Speakers Speaker systems 8 cm cone ×1
Power handling capacity 40 W
Impedance 16 Ω
Dimensions (W/H/D) (approx.) 105 mm ×230 mm ×125 mm
Mass (approx.) 0.7 kg each

1-6 (No.MB368)
SECTION 1
PRECAUTION
1.1 Safety Precautions
(1) This design of this product contains special hardware and
many circuits and components specially for safety purpos-
es. For continued protection, no changes should be made
to the original design unless authorized in writing by the
manufacturer. Replacement parts must be identical to
those used in the original circuits. Services should be per-
formed by qualified personnel only.
(2) Alterations of the design or circuitry of the product should
not be made. Any design alterations of the product should
not be made. Any design alterations or additions will void
the manufacturers warranty and will further relieve the
manufacture of responsibility for personal injury or property
damage resulting therefrom.
(3) Many electrical and mechanical parts in the products have
special safety-related characteristics. These characteris-
tics are often not evident from visual inspection nor can the
protection afforded by them necessarily be obtained by us-
ing replacement components rated for higher voltage, watt-
age, etc. Replacement parts which have these special
safety characteristics are identified in the Parts List of Ser-
vice Manual. Electrical components having such features
are identified by shading on the schematics and by ( ) on
the Parts List in the Service Manual. The use of a substitute
replacement which does not have the same safety charac-
teristics as the recommended replacement parts shown in
the Parts List of Service Manual 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 reassem-
bling.
(5) Leakage shock hazard testing
After reassembling the product, always perform an isola-
tion check on the exposed metal parts of the product (an-
tenna terminals, knobs, metal cabinet, screw heads,
headphone jack, control shafts, etc.) to be sure the product
is safe to operate without danger of electrical shock.Do not
use a line isolation transformer during this check.
• Plug the AC line cord directly into the AC outlet. Using a
"Leakage Current Tester", measure the leakage current
from each exposed metal parts of the cabinet, particular-
ly any exposed metal part having a return path to the
chassis, to a known good earth ground. Any leakage cur-
rent must not exceed 0.5mA AC (r.m.s.).
• Alternate check method
Plug the AC line cord directly into the AC outlet. Use an
AC voltmeter having, 1,000Ωper volt or more sensitivity
in the following manner. Connect a 1,500Ω10W resistor
paralleled by a 0.15µF AC-type capacitor between an ex-
posed metal part and a known good earth ground.
Measure the AC voltage across the resistor with the AC
voltmeter.
Move the resistor connection to each exposed metal
part, particularly any exposed metal part having a return
path to the chassis, and measure the AC voltage across
the resistor. Now, reverse the plug in the AC outlet and
repeat each measurement. Voltage measured any must
not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5
mA AC (r.m.s.).
1.2 Warning
(1) This equipment has been designed and manufactured to
meet international safety standards.
(2) It is the legal responsibility of the repairer to ensure that
these safety standards are maintained.
(3) Repairs must be made in accordance with the relevant
safety standards.
(4) It is essential that safety critical components are replaced
by approved parts.
(5) If mains voltage selector is provided, check setting for local
voltage.
1.3 Caution
Burrs formed during molding may be left over on some parts
of the chassis.
Therefore, pay attention to such burrs in the case of pre-
forming repair of this system.
1.4 Critical parts for safety
In regard with component parts appearing on the silk-screen
printed side (parts side) of the PWB diagrams, the parts that are
printed over with black such as the resistor ( ), diode ( )
and ICP ( ) or identified by the " " mark nearby are critical
for safety. When replacing them, be sure to use the parts of the
same type and rating as specified by the manufacturer.
(This regulation dose not Except the J and C version)
Good earth ground
Place this
probe on
each exposed
metal part.
AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)
1500 10W
0.15 F AC TYPE

(No.MB368)1-7
1.5 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.
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 tester's internal power source can easily
destroy the laser diode.
1.6 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) I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.
1.7 Attention when traverse unit is decomposed
*Please refer to "Disassembly method" in the text for the pickup unit.
• Apply solder to the short land sections before the flexible wire is disconnected from the connecto on the servo board. (If the flexible
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 sections after connecting the flexible wire.
1M
Conductive material
(conductive sheet) or iron palate
(caption)
Anti-static wrist strap
Card wire
DVD pickup
DVD changer mechanism assembly
Connector
Short land section

1-8 (No.MB368)
1.8 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 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
CAUTION : Visible and Invisible
laser radiation when open and
interlock failed or defeated.
AVOID DIRECT EXPOSURE TO
BEAM. (e)
VARNING : Synlig och
osynling laserstrålning när
den öppnas och spärren är
urkopplad. Betrakta ej
strålen. (s)
VARO : Avattaessa ja suojalukitus
ohitettuna tai viallisena olet alttiina
näkyvälle ja näkymättömälle
lasersäteilylle. Vältä säteen
kohdistumista suoraan itseesi. (f)
ADVARSEL : Synlig og usynlig
laserstråling når maskinen er
åben eller interlocken fejeler.
Undgå direkte eksponering til
stråling. (d)
!
Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.
CLASS 1
LASER PRODUCT
CAUTION : Visible and Invisible
laser radiation when open and
interlock failed or defeated.
AVOID DIRECT EXPOSURE TO
BEAM. (e)
VARNING : Synlig och
osynling laserstrålning när
den öppnas och spärren är
urkopplad. Betrakta ej
strålen. (s)
VARO : Avattaessa ja suojalukitus
ohitettuna tai viallisena olet alttiina
näkyvälle ja näkymättömälle
lasersäteilylle. Vältä säteen
kohdistumista suoraan itseesi. (f)
ADVARSEL : Synlig og usynlig
laserstråling når maskinen er
åben eller interlocken fejeler.
Undgå direkte eksponering til
stråling. (d)
WARNING LABEL

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

1-10 (No.MB368)
SECTION 3
DISASSEMBLY
3.1 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
screws Aattaching the metal cover. (See Figs.1 and 2.)
(2) From the back side of the main body, remove the eight
screws Battaching the metal cover. (See Fig.3.)
(3) Remove the metal cover from the main body while lifting
the rear section of the metal cover in the direction of the ar-
row. (See Figs.1 and 2.)
Fig.1
Fig.2
Fig.3
Metal cover
A
Metal cover
A
Metal cover
BB
B

(No.MB368)1-11
3.1.2 Removing the front panel assembly
(See Figs.4 to 6)
• Remove the metal cover.
(1) From the right side of the main body, disconnect the card
wire from the connectors CN740 on the reverse side of the
main board. (See Fig.4.)
(2) From the left side of the main body, disconnect the card
wires from the connectors (CN720, CN730) on the forward
side of the main board. (See Fig.5.)
(3) Disconnect the parallel wire while releasing the lock of the
connector CN105 on the primary board in the direction of
the arrow. (See Fig.5.)
(4) Disconnect the parallel wire from the connector CN202 on
the bridge board. (See Fig.5.)
(5) From the both side of the main body, remove the two
screws Cattaching the front panel assembly to the main
body. (See Figs.4 and 5.)
(6) From the bottom side of the main body, remove the two
screws Dattaching the front panel assembly. (See Fig.6.)
(7) From the both side of the main body, release the claws a
and remove the front panel assembly from the main body
in the direction of the arrow. (See Figs.4 to 6.)
Fig.4
Fig.5
Fig.6
Front panel assembly Main board
CN740
a
C
CN730 CN720
Primary board
Front panel assemblyMain board
C
a
Bridge board
CN202
CN105
Lock
Front panel assembly
D

1-12 (No.MB368)
3.1.3 Removing the tuner
(See Fig.7)
• Remove the metal cover.
(1) From the back side of the main body, remove the two
screws Eattaching the tuner to the rear panel.
(2) Take out the tuner from the main body and disconnect the
card wire from the connector CN1 on the tuner.
Fig.7
Rear panel Tuner
Tuner
CN1
E

(No.MB368)1-13
3.1.4 Removing the DVD changer mechanism assembly
(See Figs.8 to 10)
• Remove the metal cover.
(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. (See
Fig.8.) [For DX-T5]
(3) From the top side of the main body, remove the two screws
Fattaching the DVD changer mechanism assembly on the
mecha chassis. (See Fig.9.)
(4) Take out the DVD changer mechanism assembly from the
main body and disconnect the card wire from the connector
CN930 on the video board. (See Fig.9.)
Reference:
When the resolution of the DVD changer mechanism assem-
bly is done sequentially, release the claws bof the tray fitting
and remove the five tray fitting from the DVD changer mecha-
nism assembly. (See Fig.10.)
Fig.8
Fig.9
Fig.10
CN800 CN810
Main board
DVD changer mechanism assembly
DVD changer mechanism assembly
CN930
Video board
FF
Tray fitting bb
DVD changer mechanism assembly

1-14 (No.MB368)
3.1.5 Removing the video board
(See Figs.11 and 12.)
• Remove the metal cover and DVD changer mechanism as-
sembly .
(1) From the back side of the main body, remove the four
screws Gattaching 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
board. (See Fig.12.)
(3) Take out the video board in the direction of the arrow while
removing it from the sections cof the mecha chassis. (See
Fig.12.)
Fig.11
Fig.12
Rear panel
Video board
G
Mecha chassis
cc
CN920 CN931
Video board

(No.MB368)1-15
3.1.6 Removing the fan
(See Figs.13 and 14.)
• Remove the metal cover.
(1) From the back side of the main body, remove the screw H
attaching the rear cover to the rear panel. (See Fig.13.)
(2) Remove the joints dand remove the rear cover. (See
Fig.13.)From the left side of the main body, disconnect the
wire from the connector CN304 on the amplifier 2 board.
(See Fig.14.) [For DX-T9, DX-T5]
(3) Remove the joints dand 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.
(See Fig.14.) [For DX-T7]
(4) Release the joints eof the fan bracket in the direction of the
arrow and take out the fan with the fan bracket. (See
Fig.14.)
Reference:
Remove the fan from the fan bracket as required.
Fig.13
Fig.14
Rear paneldRear cove
r
d
dd
dH
Fan
Fan bracket
e
CN304
(CN604)
Amplifier 2
board

1-16 (No.MB368)
3.1.7 Removing the rear panel
(See Fig.15)
• Remove the metal cover and fan.
(1) Remove the two screws Jand eighteen screws Kattaching
the rear panel. [For DX-T9, DX-T7]
(2) Remove the two screws Jand seventeen screws Kattach-
ing the rear panel. [For DX-T5]
(3) Release the sections fof the rear panel and remove the
joints gof the mecha chassis in the direction of the arrow.
(4) Remove the rear panel from the main body.
Fig.15
Mecha chassis
Rear panel
g
ff
g
K
K
K
K
K
K
J
[DX-T9, DX-T7]
[DX-T5]
Mecha chassis
Rear panel
g
ff
g
K
K
K
K
K
J
K

(No.MB368)1-17
3.1.8 Removing the main board
(See Fig.16)
• Remove the metal cover, tuner, fan and rear panel.
(1) From the right side of the main body, remove the screw L
and screw Mattaching the main board.
(2) From the inside of the main body, disconnect the card wires
from the connectors (CN720, CN730, CN740, 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
from the connectors (CN720, CN730, CN740, CN760,
CN800, CN820, CN830) on the forward side of the main
board. [For DX-T5]
(4) Disconnect the main board from the bridge board toward
this side while releasing the claw hof the connector CN850
on the main board.
(5) Disconnect the main board from the surround terminal
board in the direction of the arrow while releasing the claw
iof the connector CN970 on the surround terminal board.
[For DX-T7]
(6) Disconnect the main board from the surround terminal
board in the direction of the arrow while releasing the claw
iof the connector CN990 on the surround terminal board.
[For DX-T9]
Note:
When releasing the claws (h, i), take care not to break them.
Fig.16
CN720 CN810 CN800
CN760
CN820
CN830
CN730
Main board
CN740
M
L
Main board
CN970
(CN990)
i
Main board
Bridge board
CN850
h
Surround
terminal board

1-18 (No.MB368)
3.1.9 Removing the amplifier 1 and amplifier 2 boards
(See Fig.17 to 19) [For DX-T9]
• Remove the metal cover, tuner, fan, rear panel and main
board.
(1) (1)From the right side of the main body, remove the screw
Nattaching the earth wires to the bottom chassis. (See
Fig.17.)
Reference:
After reassembling, fix the earth wires with the spacer as
before. (See Fig.17.)
(2) Disconnect the amplifier 2 board from the bridge board in
the direction of the arrow while releasing the claw jof the
connector CN200 on the bridge board. (See Fig.17.)
(3) (3)From the left side of the main body, disconnect the card
wire from the connector CN303 on the amplifier 1 board.
(See Fig.17.)
(4) Disconnect the amplifier 1 board from the bridge board in
the direction of the arrow while releasing the claw kof the
connector CN201 on the bridge board. (See Fig.18.)
Note:
When releasing the claws (j, k), take care not to break
them. (See Figs.17 and 18.)
(5) Take out the amplifier 1 board and amplifier 2 board togeth-
er from the main body.
(6) Remove the two screws Pand remove the leaf spring. (See
Fig.19.)
(7) Remove the two screws Pand remove the amplifier 1
board from the heat sink. (See Fig.19.)
(8) Remove the four screws Pand remove the amplifier 2
board from the heat sink. (See Fig.19.)
3.1.10 Removing the amplifier 1 and amplifier 2 boards
(See Fig.17 to 19) [For DX-T7]
• Remove the metal cover, tuner, fan, rear panel and main
board.
(1) From the right side of the main body, remove the screw N
attaching the earth wires to the bottom chassis. (See
Fig.17.)
Reference:
After reassembling, fix the earth wires with the spacer as
before. (See Fig.17.)
(2) Disconnect the amplifier 2 board from the bridge board in
the direction of the arrow while releasing the claw jof the
connector CN200 on the bridge board. (See Fig.17.)
(3) From the left side of the main body, disconnect the card
wire from the connector CN603 on the amplifier 1 board.
(See Fig.17.)
(4) Disconnect the amplifier 1 board from the bridge board in
the direction of the arrow while releasing the claw kof the
connector CN201 on the bridge board. (See Fig.18.)
Note:
When releasing the claws (j, k), take care not to break
them. (See Figs.17 and 18.)
(5) Take out the amplifier 1 board and amplifier 2 board togeth-
er from the main body.
(6) Remove the two screws Pand remove the leaf spring. (See
Fig.19.)
(7) Remove the two screws Pand remove the amplifier 1
board from the heat sink. (See Fig.19.)
(8) Remove the three screws Pand remove the amplifier 2
board from the heat sink. (See Fig.19.)
3.1.11 Removing the amplifier 1 and amplifier 2 boards
(See Fig.17 to 19) [For DX-T5]
• Remove the metal cover, tuner, fan, rear panel and main
board.
(1) From the right side of the main body, remove the screw N
attaching the earth wires to the bottom chassis. (See
Fig.17.)
Reference:
After reassembling, fix the earth wires with the spacer as
before. (See Fig.17.)
(2) Disconnect the amplifier 2 board from the bridge board in
the direction of the arrow while releasing the claw jof the
connector CN200 on the bridge board. (See Fig.17.)
(3) From the left side of the main body, disconnect the card
wire from the connector CN303 on the amplifier 1 board.
(See Fig.17.)
(4) Disconnect the amplifier 1 board from the bridge board in
the direction of the arrow while releasing the claw kof the
connector CN201 on the bridge board. (See Fig.18.)
Note:
When releasing the claws (j, k), take care not to break
them. (See Figs.17 and 18.)
(5) Take out the amplifier 1 board and amplifier 2 board togeth-
er from the main body.
(6) Remove the two screws Pattaching the leaf spring and re-
move the amplifier 1 board from the heat sink. (See Fig.19.)
(7) Remove the two screws Pand remove the amplifier 2
board from the heat sink. (See Fig.19.)

(No.MB368)1-19
Fig.17
Fig.18
Fig.19
Bridge board Amplifier 2 board
NBottom chassis
Earth wires
Spacer CN200
j
Bridge board
CN303
(CN603)
Amplifier 1 board
Bridge board
CN201
Bridge board
k
Amplifier 1 board Amplifier 2 board
Leaf spring Heat sink
P
P
PP
[DX-T7]
Amplifier 1 board Amplifier 2 board
Leaf spring
Heat sink
P
P
P
P
[DX-T9]
[DX-T5]
Amplifier 1 board Amplifier 2 board
Leaf spring
Heat sink
PP

1-20 (No.MB368)
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.
(1) From the left side of the main body, remove the screw Q
and screw Rattaching the primary board.
(2) Disconnect the wires from the connectors (CN103, CN106)
on the primary board.
(3) Disconnect the parallel wire while releasing the lock of the
connector CN105 on the primary board in the direction of
the arrow.
(4) Release the claw min thr direction of the arrow and discon-
nect the primary board from the bridge board toward this
side while releasing the claw nof the connector CN104 on
the primary board.
Note:
When releasing the claw n, take care not to break it.
(5) Disconnect the wires from the connectors (CN101, CN102)
on the forward side of the primary board.
(6) Disconnect the power cord from the connector CN100 on
the primary board.
(7) Take out the primary board from the main body.
Fig.20
3.1.13 Removing the bridge board
(See Fig.21)
• Remove the metal cover, tuner, fan, rear panel, main board,
amplifier 1 board, amplifier 2 board and primary board.
(1) From the top side of the main body, disconnect the parallel
wire from the connector CN202 on the bridge board.
(2) Remove the wire holders bundling the wires.
Reference:
After reassembling, bundle the wires with the wire hold-
ers as before.
(3) Remove the screw Sattaching the bridge board.
(4) Take out the bridge board from the main body.
Fig.21
CN103
CN106
CN102
CN104
CN101
CN100
Primary board
Power cord
R
Q
n
Primary board
Bridge board
CN105
Lock
m
CN202 Wire holders
Bridge board S