JVC DXT-66, DXT-77, DXT-99 Service manual
SERVICE MANUAL
COMPACT COMPONENT SYSTEM
MB53120066
DX-T99A,DX-T99EE,DX-T99US,DX-T99UW,
DX-T99UX,DX-T99UG,DX-T99UN,
DX-T77EE,DX-T77US,DX-T77UW,DX-T77UX,
DX-T77UY,DX-T77UG,DX-T77UN,
DX-T66EE,DX-T66US,DX-T66UW,DX-T66UX,
DX-T66UY,DX-T66UG,DX-T66UN
SP-DXT99C
CA-DXT99SP-DXT99S SP-DXT99SSP-DXT99WSP-DXT99W SP-DXT99FSP-DXT99F
SUPER VIDEO
CA-DXT66SP-DXT99W SP-DXT66FSP-DXT66F CA-DXT77SP-DXT77S SP-DXT77SSP-DXT99WSP-DXT99FSP-DXT99F
SUPER VIDEO
Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)
SUPER VIDEO
SP-DXT77C
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-62
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-65
COPYRIGHT © 2006 Victor Company of Japan, Limited
No.MB531
2006/6
SPECIFICATION
DX-T99
Amplifier section Output Power FRONT SPEAKERS 150 W per channel, min. RMS, driven into 4 Ω at 1 kHz with no more
than 10% total harmonic distortion.
CENTER SPEAKER 140 W per channel, min. RMS, driven into 6
than 10% total harmonic distortion.
SURROUND SPEAKERS 130 W per channel, min. RMS, driven into 6
than 10% total harmonic distortion. (for austraria and russia)
140 W per channel, min. RMS, driven into 6
than 10% total harmonic distortion. (for asia)
SUBWOOFERS 150 W per channel, min. RMS, driven into 4
than 10% total harmonic distortion. (for austraria and russia)
150 W per channel, min. RMS, driven into 4
than 10% total harmonic distortion. (for asia)
Digital output OPTICAL DIGITAL OUTPUT -21 dBm to -15 dBm (660 nm ±30 nm)
Audio input sensitivity/
Impedance*
VIDEO OUT Color system NTSC/PAL selectable
VIDEO (composite) 1 V(p-p)/75
S-VIDEO Y (luminance) 1 V(p-p)/75 Ω
COMPONENT
(Interlace/Progressive)
Speaker Terminals 4 Ω - 16 Ω (front speakers/subwoofers)
Tuner section FM tuning range 87.50 MHz - 108.00 MHz
AM (MW) tuning range 531 kHz - 1 710 kHz (for austraria)
Disc player section
Cassette deck section Frequency response Normal (type I) 50 Hz - 14 000 Hz
General Power requirement AC 110 V / AC 127 V / AC 220 V / AC 230 V - AC 240 V , (adjustable
Playable disc DVD Video/DVD Audio/CD/VCD/SVCD
Dynamic range 80 dB
Horizontal resolution 500 lines
Wow and flutter Immeasurable
Wow and flutter 0.15% (WRMS)
Power consumption 335 W (at operation)
Dimensions (W/H/D) (approx.) 185 mm
Mass (approx.) 11.4 kg
AUX 300 mV/47 kΩ
MIC 1/2 3.0 mV/50 kΩ
Ω
C (chrominance, burst) NTSC : 0.286 V(p-p)/75 Ω
(Y) 1 V(p-p)/75 Ω
(PB/PR) 0.7 V(p-p)/75 Ω
PAL : 0.3 V(p-p)/75 Ω
6
Ω - 16 Ω (surround/center speakers)
531 kHz - 1 710 kHz (at 9 kHz) (for asia)
530 kHz - 1 710 kHz (at 10 kHz) (for asia)
522 kHz - 1 629 kHz (for russia)
CD-R/CD-RW (recorded in Audio CD/Video CD/Super Video CD formats and MP3/WMA/JPEG/MPEG-1/MPEG-2/ASF/DivX files)
DVD-R (recorded in DVD Video format)
DVD-RW (recorded in DVD Video format or DVD-VR format)
with the voltage selector), 50 Hz / 60 Hz
29 W (on standby)
× 460 mm × 361 mm
Ω at 1 kHz with no more
Ω at 1 kHz with no more
Ω at 1 kHz with no more
Ω at 63 Hz with no more
Ω at 1 kHz with no more
1-2 (No.MB531)
DX-T77
Amplifier section Output Power FRONT SPEAKERS 150 W per channel, min. RMS, driven into 4 Ω at 1 kHz with no more
than 10% total harmonic distortion.
CENTER SPEAKER 50 W per channel, min. RMS, driven into 6
than 10% total harmonic distortion.
SURROUND SPEAKERS 50 W per channel, min. RMS, driven into 6
SUBWOOFERS 150 W per channel, min. RMS, driven into 4
Digital output OPTICAL DIGITAL OUTPUT -21 dBm to -15 dBm (660 nm ±30 nm)
Audio input sensitivity/
Impedance*
VIDEO OUT Color system NTSC/PAL selectable
VIDEO (composite) 1 V(p-p)/75
S-VIDEO Y (luminance) 1 V(p-p)/75 Ω
COMPONENT
(Interlace/Progressive)
Speaker Terminals 4 Ω - 16 Ω (front speakers/subwoofers)
Tuner section FM tuning range 87.50 MHz - 108.00 MHz
AM (MW) tuning range 531 kHz - 1 710 kHz (at 9 kHz) (for asia)
Disc player section Playable disc DVD Video/DVD Audio/CD/VCD/SVCD
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
Power consumption 270 W (at operation)
Dimensions (W/H/D) (approx.) 185 mm
Mass (approx.) 11.4 kg
AUX 300 mV/47 kΩ
MIC 1/2 3.0 mV/50 kΩ
C (chrominance, burst) NTSC : 0.286 V(p-p)/75 Ω
(Y) 1 V(p-p)/75 Ω
(PB/PR) 0.7 V(p-p)/75 Ω
than 10% total harmonic distortion.
than 10% total harmonic distortion. (for asia)
150 W per channel, min. RMS, driven into 4
than 10% total harmonic distortion. (for russia)
Ω
PAL : 0.3 V(p-p)/75 Ω
6
Ω - 16 Ω (surround/center speakers)
530 kHz - 1 710 kHz (at 10 kHz) (for asia)
522 kHz - 1 629 kHz (for russia)
CD-R/CD-RW (recorded in Audio CD/Video CD/Super Video CD formats and MP3/WMA/JPEG/MPEG-1/MPEG-2/ASF/DivX files)
DVD-R (recorded in DVD Video format)
DVD-RW (recorded in DVD Video format or DVD-VR format)
with the voltage selector), 50 Hz / 60 Hz
25 W (on standby)
× 460 mm × 361 mm
Ω at 1 kHz with no more
Ω at 1 kHz with no more
Ω at 1kHz with no more
Ω at 63 Hz with no more
(No.MB531)1-3
DX-T66
Amplifier section Output Power FRONT SPEAKERS 150 W per channel, min. RMS, driven into 4 Ω at 1 kHz with no more
than 10% total harmonic distortion.
SUBWOOFERS 150 W per channel, min. RMS, driven into 4
than 10% total harmonic distortion. (for asia)
150 W per channel, min. RMS, driven into 4
than 10% total harmonic distortion. (for russia)
Digital output OPTICAL DIGITAL OUTPUT -21 dBm to -15 dBm (660 nm ±30 nm)
Audio input sensitivity/
Impedance*
VIDEO OUT Color system NTSC/PAL selectable
VIDEO (composite) 1 V(p-p)/75
S-VIDEO Y (luminance) 1 V(p-p)/75 Ω
COMPONENT
(Interlace/Progressive)
Speaker Terminals 4 Ω - 16 Ω (front speakers/subwoofers)
Tuner section FM tuning range 87.50 MHz - 108.00 MHz
AM (MW) tuning range 531 kHz - 1 710 kHz (at 9 kHz) (for asia)
Disc player section Playable disc DVD Video/DVD Audio/CD/VCD/SVCD
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
Power consumption 205 W (at operation)
Dimensions (W/H/D) (approx.) 185 mm
Mass (approx.) 10.8 kg
AUX 300 mV/47 kΩ
MIC 1/2 3.0 mV/50 kΩ
Ω
C (chrominance, burst) NTSC : 0.286 V(p-p)/75 Ω
PAL : 0.3 V(p-p)/75 Ω
(Y) 1 V(p-p)/75 Ω
(PB/PR) 0.7 V(p-p)/75 Ω
6
Ω - 16 Ω (surround/center speakers)
530 kHz - 1 710 kHz (at 10 kHz) (for asia)
522 kHz - 1 629 kHz (for russia)
CD-R/CD-RW (recorded in Audio CD/Video CD/Super Video CD for-
mats and MP3/WMA/JPEG/MPEG-1/MPEG-2/ASF/DivX files)
DVD-R (recorded in DVD Video format)
DVD-RW (recorded in DVD Video format or DVD-VR format)
with the voltage selector), 50 Hz / 60 Hz
23 W (on standby)
× 460 mm × 361 mm
Ω at 1kHz with no more
Ω at 63 Hz with no more
1-4 (No.MB531)
Speaker section
Main Speakers Type 3-Way 3-Speaker Bass Reflex (Magnetically-Shielded Type)
Speaker systems Woofer 18 cm cone
Mid 6.5 cm cone
Tweeter 2 cm dome
Power handling capacity 150 W
Impedance 4
Frequency range 35 Hz - 25 000 Hz
Sound pressure level 85 dB/W·m
Dimensions (W/H/D) (approx.) 204 mm
Mass (approx.) 5.2 kg each
Subwoofer Type 1-Way Bass-Reflex (Magnetically-Shielded Type)
Speaker systems 20 cm cone
Power handling capacity 150 W
Impedance 4
Frequency range 35 Hz - 5 000 Hz
Sound pressure level 88 dB/W·m
Dimensions (W/H/D) (approx.) 238 mm
Mass (approx.) 7.1 kg
Ω
Ω
× 1
× 1
× 1
× 460 mm × 273 mm
× 1
× 460 mm × 273 mm
* Measured at 1 kHz, with tape recording signal 300 mV
Design and specifications are subject to change without notice.
(No.MB531)1-5
SECTION 1
PRECAUTION
1.1 Safety Precautions
(1) This design of this product contains special hardware and
many circuits and components specially for safety purposes. 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 performed 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 characteristics are often not evident from visual inspection nor can the
protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special
safety characteristics are identified in the Parts List of Service 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 characteristics 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 reassembling.
(5) Leakage shock hazard testing
After reassembling the product, always perform an isolation check on the exposed metal parts of the product (antenna 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, particularly any exposed metal part having a return path to the
chassis, to a known good earth ground. Any leakage current 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, 1,000Ω per volt or more sensitivity
in the following manner. Connect a 1,500Ω 10W 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.).
AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)
0.15 F AC TYPE
Place this
probe on
1500 10W
Good earth ground
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 preforming 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)
each exposed
metal part.
1-6 (No.MB531)
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.
(caption)
Anti-static wrist strap
1M
Conductive material
(conductive sheet) or iron palate
(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 card wire is disconnected from the connecto on the servo board. (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 sections after connecting the card wire.
DVD changer mechanism assembly
DVD servo board
Switch board
DVD traverse mechanism assembly
(No.MB531)1-7
1.8 Important 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.
!
Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.
REPRODUCTION AND POSITION OF LABELS and PRINT
WARNING LABEL and PRINT
1-8 (No.MB531)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
(No.MB531)1-9
SECTION 3
r
DISASSEMBLY
3.1 Main body section
3.1.1 Removing the metal cover
(See Fig.1, 2)
(1) From the both sides of the main body, remove the six
screws A attaching the metal cover. (See Fig.1)
(2) From the back side of the main body, remove the eight
screws B attaching the metal cover. (See Fig.2)
(3) Remove the metal cover from the main body while lifting
the rear section of the metal cover in the direction of the arrow. (See Fig.1)
Metal cover
A
Fig.1
B
Metal cove
A
1-10 (No.MB531)
BB
Fig.2
3.1.2 Removing the front panel assembly
(See Fig.3 to 5)
• Remove the metal cover.
(1) From the right side of the main body, disconnect the card
wire from the connectors CN740
main board. (See Fig.3)
(2) From the left side of main body, disconnect the card wires
from the connectors (CN720
of the main board. (See Fig.4)
(3) Disconnect the parallel wire while releasing the lock of the
connector CN105
the arrow. (See Fig.4)
(4) From the both side of the main body, remove the two
screws C attaching the front panel assembly to the main
body. (See Fig.3, 4)
(5) From the bottom side of the main body, remove the two
screws D attaching the front panel assembly. (See Fig.5)
(6) From the both side of main body, release the claws a and
remove the front panel assembly from the main body in the
direction of the arrow. (See Fig.3, 4)
Front panel assembly Main board
on the primary board in the direction of
on the reverse side of the
, CN730) on the forward side
Front panel assemblyMain board
CN730 CN720
C
C
Primary board
CN105
Fig.4
Front panel assembly
a
CN740
Fig.3
a
Lock
D
Fig.5
(No.MB531)1-11
3.1.3 Removing the tuner
(See Fig.6)
• Remove the metal cover.
(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 CN1
on the tuner.
Rear panel
Tuner
E
CN1
Tuner
Fig.6
1-12 (No.MB531)
3.1.4 Removing the DVD changer mechanism assembly
(See Fig.7 to 9)
• Remove the metal cover.
(1) From the left side of the main body, disconnect the card
wires from the connectors (CN800
board. (See Fig.7) [For DX-T99, DX-T77]
(2) Form the left side of the main body, disconnect the card
wires from the connector on the CN800
(See Fig.7) [For DX-T66]
(3) From the top side of the main body, remove the two screws
F attaching the DVD changer mechanism assembly on the
mecha chassis. (See Fig.8)
(4) Take out the DVD changer mechanism assembly from the
main body and disconnect the card wire from the connector
on the video board. (See Fig.8)
CN930
Reference:
When the resolution of the DVD changer mechanism assembly is done sequentially, release the claws b of the tray fitting
and remove the five tray fitting from the DVD changer mechanism assembly. (See Fig.9)
, CN810) on the main
on the main board.
DVD changer mechanism assembly
DVD changer mechanism assembly
CN800 CN810
Main board
Fig.7
Video board
CN930
Tray fitting
FF
Fig.8
bb
DVD changer mechanism assembly
Fig.9
(No.MB531)1-13
3.1.5 Removing the DVD changer mechanism assembly
(See Fig.10, 11)
• Remove the metal cover and DVD changer mechanism as-
sembly.
(1) From the back side of the metal body, remove the three
screws G attaching the video board to the rear panel. (See
Fig.10)
(2) From the top side of the main body, disconnect the card
wires from the connectors (CN920
board. (See Fig.11)
(3) Take out the video board in the direction of the arrow while
removing it from the sections c of the mecha chassis. (See
Fig.11)
, CN931) on the video
Video board
G
Rear panel
Fig.10
Mecha chassis
CN920
cc
Video board
Fig.11
CN931
1-14 (No.MB531)
3.1.6 Removing the fan
r
(See Fig.12, 13)
• 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.12)
(2) Remove the joints d and remove the rear cover. (See
Fig.12) From the left side of the main body, disconnect the
wire from the connector CN304
(See Fig.13) [DX-T99]
(3) Remove the joints d and remove the rear cover. (See
Fig.12) From the left side of the main body, disconnect the
wire from the connector CN604
(See Fig.13) [For DX-T66, DX-T77]
(4) Release the two joints e of the fan bracket in the direction
of the arrow and take out the fan with the fan bracket. (See
Fig.13)
Reference:
Remove the fan from the fan bracket as required.
on the amplifier 2 board.
on the amplifier 2 board.
H
dd
Fan bracket
e
Amplifier 2
board
CN304
(CN604)
d
Fan
Fig.13
d
d
d
d
Rear panel Rear cove
Fig.12
(No.MB531)1-15
3.1.7 Removing the rear panel
(See Fig.14)
• Remove the metal cover and fan.
(1) Remove the two screws J and eleven screws K attaching
the rear panel. [For DX-T99, DX-T77]
(2) Remove the two screws J and ten screws K attaching the
rear panel. [For DX-T66]
(3) Release the section f of the rear panel and remove the
joints g of the mecha chassis in the direction of the arrow.
(4) Remove the rear panel from the main body.
[DX-T99, DX-T77]
K
g
Rear panel
K
Mecha chassis
g
K
K
f
[DX-T66]
K
g
K
J
f
Rear panel
K
Mecha chassis
g
1-16 (No.MB531)
K
K
K
J
ff
Fig.14
3.1.8 Removing the main board
(See Fig.15)
• Remove the metal cover, tuner, fan and rear panel.
(1) From the right side of the main body, remove the screw L
and screw M attaching the main board.
(2) From the inside of the main body, disconnect the card wires
from the connectors (CN820
of the main board.
(3) Disconnect the main board from the bridge board toward
this side while releasing the claw h of the connector CN850
on the main board.
(4) Disconnect the main board from the surround terminal
board in the direction of the arrow while releasing the claw
I of the connector CN860
[For DX-T99, DX-T77]
Note:
When releasing the claws (h, j) take care not to break them.
, CN830) on the forward side
on the surround terminal board.
M
Main board
L
Main board
j
CN860
CN820
CN830
Main board
h
CN850
Bridge board
Surround
terminal board
Fig.15
(No.MB531)1-17
3.1.9 Removing the amplifier 1 and amplifier 2 boards
(See Fig.16 to 18) [For DX-T99]
• 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.16)
Reference:
After reassembling, fix the earth wires with the spacer as
before. (See Fig.16)
(2) Disconnect the amplifier 2 board from the bridge board in
the direction of the arrow while releasing the claw k of the
connector CN200
(3) Disconnect the amplifier 1 board from the bridge board in
the direction of the arrow while releasing the claw k of the
connector CN201
Note:
When releasing the claws (k, l), take care not to break
them. (See Fig.17, 18)
(4) Take out the amplifier 1 board and amplifier 2 board togeth-
er from the main body.
(5) Remove the two screws P and remove the leaf spring. (See
Fig.18)
(6) Remove the two screws P and remove the amplifier 1
board from the heat sink. (See Fig.18)
(7) Remove the four screws P and remove the amplifier 2
board from the heat sink. (See Fig.18)
3.1.10 Removing the amplifier 1 and amplifier 2 boards
(See Fig.16 to 18) [For DX-T77, DX-T66]
• Remove the metal cover, tuner, fan, rear panel and main
board.
(1) From the right side of the main body, remove the crew N
attaching the earth wires to the bottom chassis. (See
Fig.16)
Reference:
After reassembling, fix the earth wires with the spacer as
before. (See Fig.16)
(2) Disconnect the amplifier 2 board from the bridge board in
the direction of the arrow while releasing the claw k of the
connector CN200
(3) Disconnect the amplifier 1 board from the bridge board in
the direction of the arrow while releasing the claw l of the
connector CN201
Note:
When releasing the claws (k, l), take care not to break
them. (See Fig.16, 17)
(4) Take out the amplifier 1 board and amplifier 2 board togeth-
er from the main board.
(5) Remove the two screws P and remove the leaf spring. (See
Fig.18)
(6) Remove the two screws P and remove the amplifier 1
board from the heat sink. (See Fig. 18) [For DX-T77]
(7) Remove the three screws P and remove the amplifier 2
board from the heat sink. (See Fig.18)
on the bridge board. (See Fig.16)
on the bridge board. (See Fig.17)
on the bridge board. (See Fig.16)
on the bridge board. (See Fig.17)
Bridge board Amplifier 2 board
Earth wires
N
Spacer
Amplifier 1 board
CN200
Bridge board
Fig.16
l
CN201
Bottom chassis
k
Bridge board
1-18 (No.MB531)
Bridge board
Fig.17
[DX-T99]
Amplifier 1 board Amplifier 2 board
[DX-T77]
P
P
Leaf spring
Amplifier 1 board Amplifier 2 board
Heat sink
P
P
P
P
P
P
[DX-T66]
Leaf spring
Amplifier 1 board Amplifier 2 board
Heat sink
P
Leaf spring
Fig.18
Heat sink
P
P
(No.MB531)1-19
3.1.11 Removing the primary board
(See Fig.19)
• 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 at-
taching the primary board.
(2) Disconnect the wires from the connectors (CN103
on the primary board.
(3) Release the claw m of the connector CN104
board.
Note:
When releasing the claw m, take care not to break it.
(4) Disconnect the wires from connectors (CN101
the forward side of the primary board.
(5) Disconnect the power cord from the connector CN100
the primary board.
(6) Take out the primary board from the main body.
, CN106)
on the primary
, CN102) on
on
CN102
CN101
Bridge board
m
CN104
Primary board
CN103
CN106
3.1.12 Removing the primary board
(See Fig.20)
• Remove the metal cover, tuner, fan, rear panel, main board,
amplifier 1 board, amplifier 2 board and primary board.
(1) Remove the wire holders bundling the wires.
References:
After reassembling, bundle the wires with the wire hold-
ers as before.
(2) Remove the screw R attaching the bridge board.
(3) Take out the bridge board from the main body.
CN100
Power cord
Q
Primary board
Fig.19
Wire holders
1-20 (No.MB531)
Bridge board
R
Fig.20
3.1.13 Removing the surround terminal board
(See Fig.21) [For DX-T99, DX-T77]
• Remove the metal cover, tuner, fan, rear panel, main board,
amplifier 1 board, amplifier 2 board, primary board and bridge
board.
(1) Remove the screw S attaching the surround terminal board
on the bottom chassis.
(2) Remove the surround terminal board from the section (p,
q) of the bottom chassis.
(3) Take out the surround terminal board from the main body.
3.1.14 Removing the power transformer
(See Fig.21)
• Remove the metal cover, tuner, fan, rear panel, main board,
amplifier 1 board, amplifier 2 board, primary board and bridge
board.
(1) Remove the four screws T attaching the power transform-
er.
(2) Take out the power transformer from the main body.
Bottom chassis
T
q
T
Power transformer
TT
T
3.1.15 Removing the FL board
(See Fig.22)
• Remove the metal cover and front panel assembly.
(1) From the inside of the front panel assembly, remove the
parallel wire from the wire holder.
(2) Remove the eleven screws U and take out the FL board.
Surround terminal board
Front panel assembly
U
Fig.21
U
S
p
U
FL board
Fig.22
U
Wire holder
(No.MB531)1-21
3.1.16 Removing the cassette A mechanism assembly
(See Fig.23)
• Remove the metal cover and front panel assembly.
(1) From the inside of the front panel assembly, remove the
four screws V and W attaching the cassette A mechanism
assembly.
(2) Disconnect the card wires from the connectors (CN46
CN47) on the cassette A mechanism assembly.
(3) Take out the cassette A mechanism assembly from the
front panel assembly.
Reference:
Remove the trans shield as required.
Cassette A mechanism assembly
,
V
V
CN46
W
CN47
V
V
3.1.17 Removing the cassette B mechanism assembly
(See Fig.24)
• Remove the metal cover and front panel assembly.
(1) From the inside of the front panel assembly, remove the
four screws V and screw W attaching the cassette B mechanism assembly.
(2) Take out the cassette B mechanism assembly from the
front panel assembly.
Reference:
Remove the trans shield as required.
Front panel assembly Trans shield
Fig.23
Front panel assembly
VV
W
V
V
1-22 (No.MB531)
Cassette B mechanism assembly
Fig.24
Trans shield
3.1.18 Removing the microphone amplifier board
(See Fig.25, 26)
• Remove the metal cover, front panel assembly and cassette B
mechanism assembly.
(1) From the front side of the front panel assembly, pull out the
microphone volume knob. (See Fig.25)
(2) From the inside of the front panel assembly, remove the
two screws X and remove the support 1 board. (See
Fig.26)
(3) Remove the screw Y and remove the support 2 board.
(See Fig.26)
(4) Take out the microphone amplifier board from the front
panel assembly.
References:
After attaching the microphone amplifier board, fix the card
wire the spacer as before.
Front panel assembly
Microphone
volume knob
Fig.25
Front panel assembly Support 1 board
Support 2 board
Spacer
X
Y
Microphone amplifier board
Fig.26
(No.MB531)1-23
3.2 DVD changer mechanism assembly section (For DX-T99, DX-T77)
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
A from the top cover and release the two joints a on the
both sides of the DVD changer mechanism assembly. (See
Figs.1 and 2.)
(2) Remove the two rods from the top cover and remove the
top cover from the lifter assembly. (See Figs.1 and 2.)
(3) Remove the open det. lever on the left side of the DVD
changer mechanism assembly. (See Fig.3.)
(4) From the right side of the DVD changer mechanism as-
sembly, draw out the tray assemblies toward the front while
pushing the part b of the side (R) assembly. (See Figs.4
and 5.)
Note:
The tray can be locked if all tray assemblies are attached.
(5) From the topside of the DVD changer mechanism assem-
bly, move the stopper tabs c in the direction of the arrow
and release them. Pull out the tray assemblies from the
DVD changer mechanism assembly. (See Fig. 5.)
Note:
Remove the tray assembly from top tray 5 in order.
Reference:
When reattaching the tray assembly, or when removing the
disc remaining inside, refer to another section "3.3.15 Taking
out the disc in the play mode".
A
a
Lifter assembly
Fig.1
Rods
Top cover
A
a
Rods
Top cover
a
a
Lifter assembly
Fig.2
1-24 (No.MB531)
Fig.3
r
Open det. leve
Tray assemblies
c
b
Side(R) assembly
Fig.4
Tray assembly
Fig.5
(No.MB531)1-25
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 disconnecting the card wire extending from the DVD pickup. If
you do not follow this instruction, the DVD pickup may be damaged.
(1) From the topside of the DVD changer mechanism assem-
bly, solder the short land sections d on the DVD pick up.
(See Fig.6.)
(2) From the bottom side of the DVD changer mechanism as-
sembly, disconnect the card wire from the connectors
(CN201
Reference:
(3) Disconnect the wires from the connectors (CN452
on the DVD servo board. (See Fig.7.)
(4) Remove the two screws B attaching the DVD servo board.
(See Fig.7.)
(5) From the reverse side of the DVD servo board, release the
lock of the connector CN101
and disconnect the card wire. (See Fig.8.)
Caution:
Unsolder the solders from the short land sections d after reassembling. (See Fig.6.)
3.2.3 Removing the switch board
(1) From the bottom side of the DVD changer mechanism as-
sembly, remove the screw C attaching the switch board on
the DVD changer mechanism assembly.
(2) Disconnect the wires from the connectors (CN452
on the DVD servo board.
(3) Release the wires from the section f and remove the switch
board.
(4) Release the wires from the sections g and remove the
switch board.
Reference:
When reassembling, pass the wires through the sections (f, g)
as before.
, CN451) on the DVD servo board. (See Fig.7.)
When connecting the card wire to the connector CN451
pass it through the sections e on the DVD traverse
mechanism assembly. (See Fig.7.)
, CN453)
in the direction of the arrow
(See Fig.7)
, CN453)
d
,
DVD changer mechanism assembly
Fig.6
DVD changer mechanism assembly
e
CN451
DVD pickup
CN453
f
g
Switch board
B
C
CN201
DVD servo board
DVD traverse mechanism assembly
DVD servo board
B
Fig.7
CN452
CN101
1-26 (No.MB531)
Lock
Fig.8
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.
(2) Remove the two screws D attaching the motors to the load-
er assembly. (See Fig.9.)
(3) From the bottom side of the DVD changer mechanism as-
sembly, remove the two screws E. (See Fig.10.)
(4) Disconnect the connector CN2
tray switch board and remove the motor board. (See
Fig.10.)
(5) Disconnect the card wire from the connector CN1
forward side of the motor board. (See Fig.10.)
Note:
When connecting the card wire, let the card wire through the
slots h of the motor board. (See Fig.10.)
Reference:
You need not to remove the tray assemblies, and in such case,
move it.
3.2.5 Removing the motor
(See Fig. 10)
• Remove the motor board.
(1) From the reverse side of the motor board, unsolder the four
soldered sections i on the motor board.
(2) From the forward side of the motor board, remove the mo-
tors.
on the motor board from the
on the
D
Belt
Motor Motor
Motor pulleys
Belt
D
Loader assembly
Fig.9
Motors
Motor board
i
Tray switch
board
E
CN2
CN1
h
DVD changer mechanism assembly
Fig.10
Motors
Motor board
E
(No.MB531)1-27
3.2.6 Removing the DVD traverse mechanism assembly
(See Fig.11)
• Remove the tray assemblies and DVD servo board.
(1) From the bottom side of the DVD changer mechanism as-
sembly, remove the three screws F attaching the DVD
traverse mechanism assembly.
(2) Remove the wires from the section j.
(3) Take out the DVD traverse mechanism assembly from the
DVD changer mechanism assembly.
DVD changer mechanism assembly
F
j
F
F
DVD traverse mechanism assembly
Fig.11
1-28 (No.MB531)
3.2.7 Removing the DVD pickup
(See Figs.12 to 14)
• Remove the tray assemblies, DVD servo board and DVD
traverse mechanism assembly.
(1) From the top side of the DVD traverse mechanism assem-
bly, release the lock of the connector on the DVD pickup
and disconnect the card wire in the direction of the arrow.
(See Fig.12.)
(2) Turn the screw shaft gear in the direction of the arrow 1 to
move the DVD pickup in the direction of the arrow 2. (See
Fig.12.)
(3) Remove the screw G attaching the feed bracket and re-
move the feed bracket from the sections k. (See Fig.12.)
(4) Release the claw m of the thrust spring in the direction of
the arrow and remove the thrust spring. (See Fig.12.)
(5) Remove the guide shaft from the sections (n, p) on the
C.TM chassis. (See Fig.13.)
(6) Remove the section q of the DVD pickup. (See Fig.13.)
(7) Remove the two screws H attaching the rack arm spring
and rack arm. (See Fig.14.)
(8) Pull the guide shaft from the DVD pickup in the direction of
the arrow. (See Fig.14.)
3.2.8 Attaching the DVD pickup
(See Figs.12 to 14)
(1) Attach the guide shaft to the DVD pickup and attach the
rack arm spring and rack arm with the screws H. (See
Fig.14.)
(2) Attach the section q of the DVD pickup to the C.TM chassis
first and attach the guide shaft to the sections (n, p). (See
Fig.13.)
Reference:
When attaching the guide shaft to the section p, attach it
under the rod spring. (See Fig.13.)
(3) Attach the thrust spring and feed bracket with the screw G.
(See Fig.12.)
(4) Turn the screw shaft gear in the direction of the arrow 1 to
move the DVD pickup in the direction of the arrow 2. (See
Fig.15.)
(5) Connect the card wire to the connector on the DVD pickup.
(See Fig.15.)
DVD traverse mechanism assembly
Thrust spring
Connector
Screw shaft gear
DVD pickup
Fig.12
DVD pickup
1
k
Thrust spring
q
Feed bracket
2
G
m
p
Rod spring
n
Guide shaft
C.TM chassis
Fig.13
(No.MB531)1-29
Guide shaft
DVD pickup
Rack arm
H
Rack arm spring
Fig.14
Connector
DVD pickup
222
Screw shaft gear
Fig.15
1
1-30 (No.MB531)
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