JVC UX-QD70S User manual

SERVICE MANUAL
COPYRIGHT © 2005 Victor Company of Japan, Limited No.MB496
2005/12
MICRO COMPONENT MD SYSTEM
MB496200512
UX-QD70S,UX-QD70W
Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-43
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-53
Area suffix
UB ---------------------- Hong Kong
(SP-UXK30S)
(SP-UXK30W)
(SP-UXK30S)
(SP-UXK30W)
(CA-UXQD70S)
(CA-UXQD70W)

1-2 (No.MB496)
SPECIFICATION
MD/DVD receiver (CA-UXQD70S/CA-UXQD70W)
Amplifier Output power 20 W ×2 (10% THD/4 Ω)
Input terminals Analog AUX ×1
650 mV/47 kΩ: LEVEL1
260 mV/47 kΩ: LEVEL2
Digital Digital optical input ×1
-23 dBm to -15 dBm (Optical square terminal)
(Compatible with frequency of 32 kHz, 44.1 kHz and 48 kHz)
Output terminals Analog Speaker ×1, 20 W/4 Ω
Impedance 4 Ω- 16 Ω
Headphone (×1), 25 mW/32 Ω
Impedance 16 Ω- 1 kΩ
Digital DVD/CD optical output ×1
-23 dBm to -15 dBm (Optical square terminal)
Other AV COMPU LINK ×2 (Ø 3.5)
Tuner Frequency FM 87.50 MHz - 108.00 MHz
AM 531 kHz - 1 710 kHz (9 kHz spacing)
530 kHz - 1 710 kHz (10 kHz spacing)
DVD player Playable discs DVD VIDEO, DVD AUDIO, CD, VCD, SVCD,
CD-R/CDRW(CD, VCD, SVCD, MP3/WMA/JPEG format),
DVD-R(video format, MP3/WMA/JPEG format),
DVD-RW(video format, DVD VR format, MP3/WMA/JPEG format)
MD recorder Audio playing system MiniDisc digital audio system
Recording system Magneto-optical overwrite system
Reading system Non-contact, semiconductor laser pickup
Recording/Playback time
(when using an 80-minute MD)
SP 80 minutes
LP2 160 minutes
LP4 320 minutes
Sampling frequency 44.1 kHz
Audio compression ATRAC (Adaptive TRansform
system Acoustic Coding)/ATRAC3 (MDLP)
Cassette deck Frequency response Normal (type l) 60 Hz - 14 000 Hz
Wow and flutter 0.15% (WRMS)
General Power source AC 220 V , 50 Hz
Power consumption 55 W (at operation)
1.1 W (on standby)
Dimensions 165 mm (W) ×200 mm (H) ×350 mm (D)
Mass (approx.) 5.1 kg

(No.MB496)1-3
Speaker (SP-UXK30S/SP-UXK30W)
Micro component MD system (UX-QD70S/UX-QD70W)
U.S. and foreign patents licensed from Dolby Laboratories.
Design and specification are subject to change without notice.
System 3-way bass reflex type
Magnetically shielded type
Speakers Woofer 10 cm cone speaker ×1
Midrange 4 cm cone speaker ×1
Tweeter 1.5 cm dome speaker ×1
Power handling capacity 20 W
Impedance 4 Ω
Frequency range 56 Hz - 40 kHz
Sound pressure level 85 dB/W·m
Dimensions 135 mm (W) ×200.5 mm (H) ×213.5 mm (D)
Mass (approx.) 2.1 kg (1 unit)
Dimensions 435 mm (W) ×200.5 mm (H) ×350 mm (D)
Mass (approx.) 9.3 kg

1-4 (No.MB496)
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.MB496)1-5
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.
1M
Conductive material
(conductive sheet) or iron palate
(caption)
Anti-static wrist strap

1-6 (No.MB496)
1.7 Attention when pickup unit is removed
1.7.1 Attention when MD pickup unit is removed
*Please refer to "DISASSEMBLY" in the text.
(1) Apply solder to short land section before the flexible wire is disconnected from the connector CN310 on the MD servo control
board.
(If the flexible wire is disconnected without applying solder, the pickup may be destroyed by static electricity.)
(2) In the assembly, be sure to remove solder from the short land section after connecting the flexible wire.
(3) Apply solder to short land section before the flexible wire is disconnected from the connector on the pickup.
(If the flexible wire is disconnected without applying solder, the pickup may be destroyed by static electricity.)
(4) In the assembly, be sure to remove solder from the short land section after connecting the flexible wire.
1.7.2 Attention when DVD pickup unit is removed
*Please refer to "DISASSEMBLY" in the text.
(1) Apply solder to short land sections before the card wire is disconnected from the connector on the pickup.
(If the card wire is disconnected without applying solder, the pickup may be destroyed by static electricity.)
(2) In the assembly, be sure to remove solder from the short land sections after connecting the card wire.
MD servo control board
MD servo control board
CN310
Pickup
Short land section
Flexible wire
Pickup
Short land section
Flexible wire
Pickup
Short land sections
Connecto
r
Card wire

(No.MB496)1-7
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

1-8 (No.MB496)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

(No.MB496)1-9
SECTION 3
DISASSEMBLY
3.1 Main body section
3.1.1 Removing the rear cover(B)
(See Figs.1 and 2)
(1) From the back side of the main body, remove the twelve
screws Aattaching the rear cover(B). (See Fig.1.)
(2) From the bottom side of the main body, remove the three
screws Battaching the rear cover(B). (See Fig.2.)
(3) Remove the rear cover(B) from the main body.
Fig.1
Fig.2
Rear cover(B)
A
A AA
Rear cover(B)
B

1-10 (No.MB496)
3.1.2 Removing the side panels (L)/(R)
(See Fig.3)
• Remove the rear cover(B).
(1) From the bottom side of the main body, remove the two
screws Cattaching the side panels (L)/(R).
(2) Slide the side panels (L)/(R) in the direction of the arrow
and remove the side panels (L)/(R).
Fig.3
3.1.3 Removing the top cover assembly
(See Figs.4 and 5)
• Remove the rear cover(B) and side panels(L)/(R).
(1) From the left side of the main body, disconnect the card
wires from the connectors (CN703, CN709) on the micon
board. (See Fig.4.)
(2) Remove the screw Dattaching the top cover assembly.
(See Fig.4.)
(3) From the right side of the main body, disconnect the card
wire from the connector CN105 on the main board. (See
Fig.5.)
(4) Disconnect the wire from the connector CN108 on the main
board. (See Fig.5.)
(5) From the both sides of the main body, remove the two
screws Eattaching the top cover assembly. (See Figs.4
and 5.)
(6) Release the joints aand remove the top cover assembly.
(See Figs.4 and 5.)
Fig.4
Fig.5
Side panel (R)
Side panel (L)
C
C
ED
Micon boardCN703 CN709
Top cover assembly a
E
Main board
Top cover assembly
CN105 CN108
a

(No.MB496)1-11
3.1.4 Removing the front panel assembly
(See Figs.6 to 8)
• Remove the rear cover(B), side panels(L)/(R) and top cover
assembly.
(1) From the left side of the main body, disconnect the card
wires from the connectors (CN702, CN710) on the micon
board. (See Fig.6.)
(2) From the both sides and bottom sides of the main body, re-
lease the joints band joint c. (See Figs.6 to 8.)
(3) Remove the front panel assembly in the direction of the ar-
row. (See Fig 8.)
Fig.6
Fig.7
Fig.8
Micon board
CN710
CN702
b
Front panel assembly
Front panel assembly
b
Front panel assembly
c

1-12 (No.MB496)
3.1.5 Removing the fan motor
(See Figs.9 and 10)
• Remove the rear cover(B), side panels(L)/(R) and top cover
assembly.
(1) From the back side of the top cover assembly, remove the
screw Fattaching the fan motor. (See Fig.9.)
(2) Take out the fan motor.
Reference:
When attaching the fan motor, pass the wire through the slot
d. (See Fig.10.)
3.1.6 Removing the tuner and tuner bracket
(See Figs.9 and 10)
• Remove the rear cover(B), side panels(L)/(R) and top cover
assembly.
(1) From the back side of the top cover assembly, remove the
two screws Gattaching the tuner bracket. (See Fig.9.)
(2) From the inside of the top cover assembly, remove the
screw Hattaching the tuner bracket. (See Fig.10.)
(3) Take out the tuner with the tuner bracket.
3.1.7 Removing the cassette mechanism assembly
(See Fig.10)
• Remove the rear cover(B), side panels(L)/(R) and top cover
assembly.
(1) From the inside of the top cover assembly, remove the four
screws Jattaching the cassette mechanism assembly.
(2) Remove the cassette mechanism assembly.
Fig.9
Fig.10
F
Tuner bracket
Fan motor G
Cassette mechanism assembly
Tuner
H
J
JJ
J
Top cover assembly
Shield
Tuner bracket
d

(No.MB496)1-13
3.1.8 Removing the heat sink(B)
(See Fig.11)
• Remove the rear cover(B), side panels(L)/(R) and top cover
assembly.
(1) From the back side of the main body, remove the three
screws Kand two screws Mattaching the heat sink(B).
(2) Remove the heat sink(B) from the main body.
3.1.9 Removing the heat sink bracket
(See Figs.11 and 12)
• Remove the rear cover(B), side panels(L)/(R), top cover as-
sembly and heat sink(B).
(1) From the back side of the main body, remove the two
screws Nattaching the heat sink bracket. (See Fig.11.)
(2) From the top side of main body, remove the screw Pat-
taching the heat sink bracket to the regulator board.(See
Fig.12)
(3) Take out the heat sink(B) from the main body.
3.1.10 Removing the main board
(See Figs.12 and 13)
• Remove the rear cover(B), side panels(L)/(R), top cover as-
sembly and heat sink(B).
(1) From the forward side of the main board, disconnect the
card wire from the connector CN107. (See Fig.12.)
(2) From the right side of the main body, remove the four
screws Qattaching the main board. (See Fig.13.)
(3) Disconnect the connectors (CN101 to CN103, CN106 and
CN110) on the main board toward this side. (See Fig.13.)
(4) From the forward side of the main board, disconnect the
wires from the connectors (CN109 and CN111). (See
Fig.13.)
Fig.11
Fig.12
Fig.13
M
N
Heat sink(B)
Heat sink bracket
K
Main board
CN107
P
QQ
Main board
CN103 CN102
CN106
CN111
CN101 CN109
CN110

1-14 (No.MB496)
3.1.11 Removing the regulator board
(See Fig.14)
• Remove the rear cover(B), side panels(L)/(R), top cover as-
sembly, heat sink(B) and main board.
(1) From the top side of the main body, disconnect the wire
from the connector CN902 on the trans board.
(2) Disconnect the wire from the connector CN807 on the joint
board.
(3) Remove the two screws Rattaching the regulator board.
(4) Take out the regulator board from the main body.
Reference:
After reassembling, bundle the wire with the new tie band as
before.
Fig.14
3.1.12 Removing the trans board
(See Fig.15)
• Remove the rear cover(B), side panels(L)/(R), top cover as-
sembly, heat sink(B), main board and regulator board.
(1) Disconnect the wire from the connector CN903 on the trans
board.
(2) Disconnect the power cord from the connector CN901 on
the trans board.
(3) Remove the three screws Sattaching the power transform-
er and take out the trans board from the main body.
Reference:
After reassembling, bundle the wire with the new tie band as
before.
3.1.13 Removing the jack board and video board
(See Fig.15)
• Remove the rear cover(B), side panels(L)/(R), top cover as-
sembly, heat sink(B), main board and regulator board.
(1) Remove the screw Tattaching the jack board and take out
the jack board with the video board.
Fig.15
Regulator board
Joint board
CN807
R
Trans board
CN902
R
S
Trans board
Video board
Jack board
CN903 CN901 Power cord
S T

(No.MB496)1-15
3.1.14 Removing the power transformer
(See Fig.16)
• Remove the rear cover(B), side panels(L)/(R), top cover as-
sembly, heat sink(B), main board, regulator board and trans
board.
(1) From the reverse side of the trans board, remove the sol-
ders from the sections e on the trans board.
(2) Remove the power transformer from the trans board.
Fig.16
3.1.15 Removing the joint board
(See Fig.17)
• Remove the rear cover(B), side panels(L)/(R), top cover as-
sembly, heat sink(B), main board, regulator board and trans
board.
(1) From the back side of the main body, remove the two
screws Uattaching the joint board.
(2) Remove the connector CN805 on the joint board from the
micon board toward this side.
(3) From the forward side of the joint board, disconnect the
card wires from the connectors (CN801 to CN804) on the
joint board.
(4) Take out the joint board from the main body.
Fig.17
eTrans board
UU
Joint board Micon board
CN803
CN802 CN801
CN805
CN804

1-16 (No.MB496)
3.1.16 Removing the MD mechanism assembly
(See Figs.18 to 20)
• Remove the rear cover(B), side panels(L)/(R), top cover as-
sembly, front panel assembly, heat sink(B) and main board.
(1) From the both side of the main body, remove the four
screws Vattaching the MD mechanism assembly. (See
Figs.18 and 19.)
(2) From the top of the main body, disconnect the card wire
from the connector CN803 on the joint board. (See Fig.20)
(3) Take out the MD mechanism assembly from the main
body.
3.1.17 Removing the MD holder
(See Fig 20)
• Remove the rear cover(B), side panels(L)/(R), top cover as-
sembly, front panel assembly, heat sink(B), main board and
MD mechanism assembly.
(1) From the top side of the main body, remove the shield(MD).
(2) Remove the two screws Wand screw Xattaching the MD
holder to the micon board.
(3) Take out the MD holder from main body. Fig.18
Fig.19
Fig.20
MD mechanism assembly
V
V
MD mechanism assembly
Joint board
MD holder Micon board
Shield(MD)
W
X
W
CN803

(No.MB496)1-17
3.1.18 Removing the micon board
(See Fig.21)
• Remove the rear cover(B), side panels(L)/(R), top cover as-
sembly, front panel assembly, heat sink(B), main board, MD
mechanism assembly, MD holder and regulator board.
(1) Disconnect the wire from the connector CN903 on the trans
board. (See Fig.21.)
(2) Disconnect the card wires from the connectors (CN705 and
CN711) on the micon board. (See Fig.21.)
(3) Disconnect the micon board from the connector CN805 on
the joint board. (See Fig.21.)
(4) Take out the micon board from the main body.
Fig.21
3.1.19 Removing the CD mechanism bracket
(See Fig.22)
• Remove the rear cover(B), side panels(L)/(R), top cover as-
sembly, heat sink(B), heat sink bracket, main board, regulator
board, trans board and joint board.
(1) From the top side of the main body, disconnect the wires
from the connectors (CN705 and CN711) on the micon
board.
(2) Remove the four screws Yattaching the CD mechanism
bracket.
(3) Take out the CD mechanism bracket from the main body.
Fig.22
Trans board
Micon board
CN903CN705CN711 CN805
Micon board
CD mechanism bracket
CN705CN711
Y
Y
Y

1-18 (No.MB496)
3.1.20 Removing the DVD mechanism assembly
(See Fig.23)
• Remove the rear cover(B), side panels(L)/(R), top cover as-
sembly, heat sink(B), main board, regulator board, trans
board, CD mechanism bracket and joint board.
(1) From the top side of the main body, remove the screw Zat-
taching the DVD mechanism assembly.
(2) Take out the DVD mechanism assembly from the main
body.
Note:
When removing the DVD mechanism assembly, be careful not
to damage the lower board and parts.
Fig.23
3.1.21 Removing the LCD board
(See Fig.24)
• Remove the rear cover(B), side panels(L)/(R), top cover as-
sembly and front panel assembly.
(1) From the inside of the front panel assembly, remove the
three screws AA attaching the LCD board.
(2) Take out the LCD board from the front panel assembly.
Note:
When attaching the LCD board, be careful not to damage the
LCD panel.
Fig.24
Z
DVD mechanism assembly
AA LCD board

(No.MB496)1-19
3.1.22 Removing the key board
(See Fig.25)
• Remove the rear cover(B), side panels(L)/(R), top cover as-
sembly and front panel assembly.
(1) From the inside of the front panel assembly, remove the
five screws AB attaching the key board.
(2) Take out the key board from the front panel assembly.
Fig.25
3.1.23 Removing the headphone board
(See Fig.26)
• Remove the rear cover(B), side panels(L)/(R), top cover as-
sembly, heat sink(B), main board, regulator board, trans
board, joint board, CD mechanism bracket and DVD mecha-
nism assembly.
(1) From the top side of the main body, remove the screw AC
attaching the headphone board.
(2) Take out the headphone board from the main body.
Fig.26
Key board
AB
AC
Headphone board

1-20 (No.MB496)
3.2 DVD mechanism assembly
• Remove the DVD mechanism assembly from main body.
(Refer the Disassembly method)
3.2.1 Removing the DVD cover
(See fig.1 and 2)
(1) Remove the two screws Aattaching the DVD cover from
top side of DVD mechanism assembly. (See fig.1)
(2) Remove the card wire from the connector CN4 on the LED
assembly. (See fig.1)
(3) Remove the DVD cover.
Caution:
The spring which presses down a card wire is attached to the
DVD cover. Please do not let me lose a spring.
Fig.1
Fig.2
DVD cover
A
ALED assembly
CN4
Spring
DVD cover