JVC HX-GD8 User manual

SERVICE MANUAL
COPYRIGHT © 2004 VICTOR COMPANY OF JAPAN, LIMITED No.MB188
2004/4
COMPACT COMPONENT SYSTEM
MB18820044
HX-GD8
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-39
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-55
Area suffix
J ----------------------------- U.S.A.
C -------------------------- Canada
CA-HXGD8 SP-HXGD8SP-HXGD8

1-2 (No.MB188)
SPECIFICATION
Design and specifications are subject to change without notice.
Amplifier section CA-HXGD8
Output Power SUBWOOFERS 195 W per channel, min. RMS, driven into 6 Ωat 63 Hz with no more than 10 % total harmonic
distortion.
MAIN SPEAKERS 80 W per channel, min. RMS, driven into 6 Ωat 1 kHz with no more than 10 % total harmonic
distortion.
Audio input sensitivity/imped-
ance (Measured at 1 kHz, with
tape recording signal 300 mV)
AUX:300 mV/47 kΩ
Digital output OPTICAL DIGITAL OUTPUT -21 dBm to -15 dBm (660 nm ± 30 nm)
VIDEO OUT Color system NTSC
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
(P B/PR):0.7 V(p-p)/75 Ω
Speaker
Terminals
MAIN SPEAKERS 6 Ω- 16 Ω()
SUBWOOFERS 6 Ω- 16 Ω()
Others AV COMPU LINK ×2 (Ø 3.5)
Tuner section FM tuning range 87.5 MHz - 108.0 MHz
AM tuning range 530 kHz - 1 710 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/ MP3/ WMA/ JPEG format)
DVD-R/DVD-RW (recorded in video format)
Dynamic range 90 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 120 V , 60 Hz
Power consumption 265 W/ 325 VA (at operation)
30 W (on standby)
Dimensions (approx.) (W/H/D) 205 mm ×370 mm ×432 mm
(8 1/8 in. ×14 5/8 in. ×17 1/16 in.)
Mass (approx.) 11 kg (24.3 lbs)
Speaker section SP-HXGD8
Type 3-Way 4-Speaker Bass-Reflex Type
Speakers Subwoofer 20 cm (7 7/8 in.)cone ×1
Woofer 13.5 cm (5 3/8in.) cone ×2
Tweeter 5 cm (2 in.) cone ×1
Power handling capacity Subwoofer 195 W
Main speaker 80 W
Impedance Subwoofer 6 Ω
Main speaker 6 Ω
Frequency range Subwoofer 30 Hz - 970 Hz
Main speaker 75 Hz 25 000 Hz
Sound pressure level Subwoofer 83 dB/W·m
Main speaker 88 dB/W·m
Dimensions (approx.) (W/H/D) 240 mm ×457 mm ×407 mm
(9 1/2 in. ×18 in. ×16 1/16 in.)
Mass (approx.) 10 kg (22.1 lbs) each

(No.MB188)1-3
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

1-4 (No.MB188)
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
DVD pickup
DVD changer mechanism assembly
Short land sections

(No.MB188)1-5
1.8 Importance administering point on the safety
8A-125V
F102
8A-125V
F101
1.6A-125V
F104
6.3A-125V
F001
3.15A-125V
F103
Caution: For continued protection against risk of
fire, replace only with same type 6.3 A/125 V for
F001, 8 A/125 V for F101 and F102, 3.15 A/125 V
for F103, 1.6 A/125 V for F104.
This symbol specifies type of fast operating fuse.
Precaution: Pour eviter risques de feux, remplacez
le fusible de surete de F001 comme le meme type
que 6,3 A/125 V, 8 A/125 V pour F101 et F102, et
3,15 A/125 V pour F103, et 1,6 A/125V pour F104.
Ce sont des fusibles suretes qui functionnes rapide.
^
Primary board (Forward side)

1-6 (No.MB188)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe ADJUSTMENT.

(No.MB188)1-7
SECTION 3
DISASSEMBLY
3.1 Main body section
3.1.1 Removing the metal cover
(See Figs.1 to 3)
(1) From the back side of the main body, remove the six
screws Aattaching the metal cover. (See Fig.1.)
(2) From the both sides of the main body, remove the two
screws Battaching the metal cover. (See Figs.2 and 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.2 and 3.)
Fig.1
Fig.2
Fig.3
Metal cover
A
A
A
Metal cover
B
Metal cove
r
B

1-8 (No.MB188)
3.1.2 Removing the front panel assembly
(See Figs.4 to 7)
• Prior to performing the following procedures, remove the metal
cover.
(1) From the right side of the main body, disconnect the card
wires from the connectors (CN43, CN44, CN802, CN803)
on the main board. (See Fig.4.)
(2) Disconnect the earth wire from the chassis base. (See
Fig.4.)
(3) From the top side of the main body, disconnect the parallel
wires from the connectors (CN201, CN205) on the bridge
board. (See Fig.5.)
Reference:
When reassembling, pass the parallel wire through the
hole aon the plastic chassis before connecting the par-
allel wire to the connector CN201 on the bridge board.
(See Fig.5.)
(4) From the left side of the main body, remove the tie band
bundling the wires. (See Fig.16.)
Reference:
After reassembling, bundle the wires with the new tie
band as before. (See Fig.16.)
(5) Disconnect the earth wire from the chassis base. (See
Fig.6.)
(6) From the both sides of the main body, remove the two
screws Cattaching the front panel assembly. (See Figs.4
and 6.)
(7) From the bottom side of the main body, remove the three
screws Dattaching the front panel assembly. (See Fig.7.)
(8) Release the joints bof the front panel assembly from the
chassis base and remove the front panel assembly in the
direction of the arrow. (See Figs.4, 6 and 7.)
Fig.4
Fig.5
Fig.6
Fig.7
Front panel assembly Card wires
Card wires
Earth wire
Chassis base
Main board
CN803
CN802
CN43
CN44
b
C
Parallel wire
Parallel wire
Plastic chassis
Bridge board
CN201
CN205
a
Parallel wire
Front panel assembly
Earth wire
Chassis base
b
C
Tie band
Front panel assembly
Chassis base
b
b
D

(No.MB188)1-9
3.1.3 Removing the tuner
(See Figs.8 and 9)
• Prior to performing the following procedures, remove the metal
cover.
(1) From the right side of the main body, disconnect the card
wire from the connector CN560 on the main board. (See
Fig.8.)
(2) From the back side of the main body, remove the two
screws Eattaching the tuner to the rear panel. (See Fig.9.)
3.1.4 Removing the video board
(See Figs.8 and 9)
• Prior to performing the following procedures, remove the metal
cover.
(1) From the right side of the main body, disconnect the card
wire from the connector CN502 on the main board. (See
Fig.8.)
(2) From the back side of the main body, remove the two
screws Fattaching the video board to the rear panel. (See
Fig.9.)
Fig.8
Fig.9
Card wires
Tuner Main board
CN560
CN502
Video board
Rear panel
E E
F

1-10 (No.MB188)
3.1.5 Removing the rear panel
(See Figs.10 to 12)
• Prior to performing the following procedures, remove the metal
cover.
(1) From the top side of the main body, remove the tie band
bundling the wires. (See Fig.10.)
Reference:
After reassembling, bundle the wires with the new tie
band as before. (See Fig.10.)
(2) Disconnect the wire from the connector CN202 on the
bridge board. (See Fig.10.)
(3) From the back side of the main body, remove the two
screws Gand screw Hattaching the rear cover. (See
Fig.11.)
(4) Release the sections cand remove the rear cover. (See
Fig.11.)
(5) Remove the sixteen screws Jattaching the rear panel.
(See Fig.12.)
(6) From the both sides of the main body, release the joints d
attaching the rear panel to the chassis base and remove
the rear panel with the fan. (See Fig.12.)
3.1.6 Removing the fan
(See Figs.10 to 12)
• Prior to performing the following procedures, remove the metal
cover.
(1) From the top side of the main body, remove the tie band
bundling the wires. (See Fig.10.)
Reference:
After reassembling, bundle the wires with the new tie
band as before. (See Fig.10.)
(2) Disconnect the wire from the connector CN202 on the
bridge board. (See Fig.10.)
(3) From the back side of the main body, remove the two
screws Gand screw Hattaching the rear cover. (See
Fig.11.)
(4) Remove the two screws Kattaching the fan. (See Fig.12.)
(5) Take out the fan from the main body.
Fig.10
Fig.11
Fig.12
Bridge board
CN202
Tie band
Wires
Rear cove
r
c
c
c
H
G
Rear panel
Fan
dd
J
J
J
J
J
KK

(No.MB188)1-11
3.1.7 Removing the main board
(See Figs.13 and 14)
• Prior to performing the following procedures, remove the metal
cover, tuner, video board and rear panel.
(1) From the right side of the main body, disconnect the card
wires from the connectors (CN43, CN44, CN110, CN111,
CN802, CN803) on the main board. (See Fig.13.)
(2) Disconnect the parallel wires from the connector CN715 on
the forward side of the main board. (See Fig.13.)
(3) Remove the two screws Lattaching the main board. (See
Fig.14.)
(4) Disconnect the connector CN217 on the main board to-
ward this side and disconnect the connector CN501 on the
main board in the direction of the arrow. (See Fig.14.)
Reference:
• When attaching the main board, insert the sections eof the
bridge board in the hole of the main board. (See Fig.14.)
• Insert the section fof the main board in the hole of the chas-
sis base before attaching the screws L.
Fig.13
Fig.14
Card wires
Card wires
Main board
CN803
CN802
CN43
CN44
CN111
CN110
CN715
Chassis base
Main board
Main board
CN501
CN217
e
e
f
L
L
Bridge board

1-12 (No.MB188)
3.1.8 Removing the main amplifier board/subwoofer amplifier boards
(See Figs.15 to 17)
• Prior to performing the following procedures, remove the metal
cover, tuner, video board, rear panel and main board.
(1) From the top side of the main body, disconnect the wires
from the connector (CN206, CN208) on the bridge board.
(See Fig.15.)
(2) From the back side of the main body, remove the tie band
bundling the wires. (See Fig.16.)
Reference:
After reassembling, bundle the wires with the new tie
band as before. (See Fig.16.)
(3) Disconnect the connectors (CN600, CN700) on the main
amplifier/subwoofer amplifier boards from the connection
board in the direction of the arrow. (See Fig.16.)
(4) Remove the two screws Mand screw Nattaching the main
amplifier board. (See Fig.17.)
(5) Removing the two screws Pand screw Qattaching the
subwoofer amplifier board. (See Fig.17.) Fig.15
Fig.16
Fig.17
Wires
CN206CN208
Bridge board
CN600 CN700
Main amplifier board
Connection board
Heat sink
Subwoofer amplifier board
Wires
Tie band
Main amplifier board
M
N
Q
P
Subwoofer amplifier board

(No.MB188)1-13
3.1.9 Removing the connection board
(See Fig.18.)
• Prior to performing the following procedure, remove the metal
cover, tuner, video board, rear panel, main board and main
amplifier/subwoofer amplifier boards.
(1) From the top side of the main body, remove the two screws
Rattaching the connection board on the chassis base.
Reference:
When reassembling, attach the connection board to the sec-
tion gand align the projection hof the chassis base to the hole
of the connection board.
Fig.18
3.1.10 Removing the bridge board
(See Figs.19 and 20)
• Prior to performing the following procedures, remove the metal
cover, tuner, video board, rear panel and main board.
(1) From the top side of the main body, release the wire holder
bundling the wire. (See Fig.19.)
(2) Disconnect the wires from the connectors (CN206, CN208,
CN214) on the bridge board. (See Fig.19.)
Reference:
After connecting the wire to the connector CN214, fix the
wire with the wire holder. (See Fig.19.)
(3) Disconnect the parallel wires from the connectors (CN201,
CN205, CN213) on the bridge board. (See Fig.19.)
(4) Release the wire holder holding the card wire. (See
Fig.19.)
(5) Remove the spacer fixing the wire on the bridge board.
(See Fig.19.)
(6) Remove the two screws Sattaching the bridge board on
the 5DVD changer mechanism assembly. (See Fig.20.)
(7) Bend the claw iin the direction of the arrow and remove the
bridge board in an upward direction. (See Fig.20.)
Reference:
• When attaching the bridge board, align the projections (j, k)
in the hole of the bridge board. (See Fig.20.)
• When reassembling, pass the wires through the sections
(m, n) of the plastic chassis. (See Fig.19.)
Fig.19
Fig.20
R
R
Chassis base
Connection board h
g
mn
Bridge board
Wires
Wire holder
Parallel wire
CN214
CN213CN201
CN205
CN206
CN208
Card wire
Wire holder
Wire
Spacer
S
S
k
j
i
Bridge board
5DVD change
r
mechanism
assembly

1-14 (No.MB188)
3.1.11 Removing the 5DVD changer mechanism assembly
(See Figs.21 to 23)
• Prior to performing the following procedures, remove the metal
cover, tuner, video board, rear panel, main board and bridge
board.
(1) From the both sides of the main body, remove the two
screws Tattaching the 5DVD changer mechanism assem-
bly to the front panel assembly. (See Figs.21 and 22.)
(2) From the left side of the main body, remove the tie band
bundling the wire and parallel wires. (See Fig.22.)
Reference:
After reassembling, bundle the wire and parallel wires
with the new tie band as before. (See Fig.22.)
(3) Take out the 5DVD changer mechanism assembly from the
main body.
Reference:
When attaching the 5CD changer mechanism assembly,
pass the wires through the sections (m, n) of the plastic
chassis. (See Fig.22.)
(4) From the both and top sides of the 5DVD changer mecha-
nism assembly, remove the two screws Uand screw U' at-
taching the main chassis. (See Fig.23.)
Reference:
• Align the projections sof the plastic chassis to the
holes of the main chassis before attaching the screw
U'. (See Fig.23.)
• When attaching the screw U', attach the earth wire
with it. (See Fig.23.)
(5) Take out the main chassis.
(6) From the top side of the 5DVD changer mechanism as-
sembly, remove the three screws Vand screw V' attaching
the 5DVD changer mechanism assembly on the plastic
chassis.
Reference:
• When reassembling, align the projections (p, q, r) of the
plastic chassis to the holes of the 5DVD changer mechanism
assembly before attaching the screws Vand V'. (See
Fig.23.)
• When attaching the screw V', attach the earth wire with it.
(See Fig.23.)
Fig.21
Fig.22
Fig.23
T
5DVD changer mechanism assembly
Front panel assembly
T
5DVD changer
mechanism assembly
Front panel assembly
Wires
mn
Tie band
V
V
V
V
V'
U
U
U'
5DVD changer
mechanism assembly
Plastic chassis
p
q
s
s
r
Earth wire
Main chassis

(No.MB188)1-15
3.1.12 Removing the primary board
(See Figs.19, 21, 22, 24 and 25)
• Prior to performing the following procedures, remove the metal
cover, tuner, video board, rear panel and main board.
(1) From the top side of the main body, release the wire holder
bundling the wire. (See Fig.19.)
(2) Disconnect the wires from the connectors (CN206, CN208,
CN214) on the bridge board. (See Fig.19.)
Reference:
After connecting the wire to the connector CN214, fix the
wire with the wire holder. (See Fig.19.)
(3) Disconnect the parallel wires from the connectors (CN201,
CN205, CN213) on the bridge board. (See Fig.19.)
(4) Release the wire holder holding the card wire. (See
Fig.19.)
(5) Remove the spacer fixing the wire on the bridge board.
(See Fig.19.)
(6) From the both sides of the main body, remove the two
screws Tattaching the 5DVD changer mechanism assem-
bly to the front panel assembly. (See Figs.21 and 22.)
Reference:
It is not necessary to remove the bridge board from the
5DVD changer mechanism assembly.
(7) Take out the 5DVD changer mechanism assembly with the
bridge board from the main body.
Reference:
When attaching the 5DVD changer mechanism assem-
bly, pass the wires through the sections (m, n) of the
5DVD changer mechanism assembly. (See Fig.22.)
(8) From the top and left sides of the main body, remove the
four screws Wand screw Xattaching the primary board on
the chassis base. (See Figs.24 and 25.)
(9) From the forward side of the primary board, disconnect the
power cord from the connector CN200. (See Fig.25.)
Fig.24
Fig.25
3.1.13 Removing the FL board
(See Fig.26)
• Prior to performing the following procedures, remove the metal
cover and front panel assembly.
(1) From the inside of the front panel assembly, remove the
soldered sections (t, u) on the FL board to remove the par-
allel wires.
(2) Disconnect the card wire from the connector CN902 on the
FL board.
(3) Remove the four screws Yattaching the FL board.
Reference:
When attaching the FL board, align the projections vof the
front panel assembly in the holes of the FL board before at-
taching the screws Y.
Fig.26
W
Primary board
Chassis base
W
X
Primary board
Chassis basePower cord
CN200
Y
Y
Y
Front panel assembly
Card wire
FL board
Parallel wire
Parallel wire
t
v
u
CN902
Y
v

1-16 (No.MB188)
3.1.14 Removing the switch board
(See Fig.27)
• Prior to performing the following procedures, remove the metal
cover and front panel assembly.
(1) From the inside of the front panel assembly, remove the
three screws Zattaching the switch board.
(2) Take out the switch board and remove the soldered section
won the switch board to remove the parallel wire.
Reference:
When attaching the switch board, align the projections xin the
holes of the switch board before attaching the screws Z.
3.1.15 Removing the standby LED board
(See Fig.27)
• Prior to performing the following procedures, remove the metal
cover and front panel assembly.
(1) From the inside of the front panel assembly, remove the
two screws AA attaching the standby LED board.
(2) Take out the standby LED board and remove the soldered
section yon the standby LED board to remove the parallel
wire.
Reference:
When attaching the standby LED board, align the projections
zin the holes of the standby LED board before attaching the
screws AA.
Fig.27
Z
Z
Z
AA
AA
Front panel assembly
z
z
x
x
w
x
y
Parallel wires
Standby LED board
Switch board

(No.MB188)1-17
3.1.16 Removing the encoder board
(See Figs.26 to 29)
• Prior to performing the following procedures, remove the metal
cover and front panel assembly.
(1) From the outside of the front panel assembly, pull out the
knobs toward this side. (See Fig.28.)
(2) From the inside of the front panel assembly, disconnect the
card wire from the connector CN902 on the FL board. (See
Fig.26.)
(3) Remove the four screws Y, three screws Zand two screws
AA attaching the each board. (See Figs.26 and 27.)
(4) Take out the FL board with the switch and standby LED
boards.
Reference:
It is not necessary to remove the parallel wires.
(5) Remove the eight screws AB attaching the encoder board.
(See Fig.29.)
Reference:
When attaching the encoder board, align the projections aa of
the front panel assembly in the holes of the encoder board be-
fore attaching the screws AB. (See Fig.29.)
Fig.28
Fig.29
Front panel assembly
Volume knob
Sound mode knob
Preset knob
AB
AB
AB
AB
aa
aa
Encoder boardFront panel assembly

1-18 (No.MB188)
3.1.17 Removing the microphone board
(See Fig.30)
• Prior to performing the following procedure, remove the metal
cover and front panel assembly.
From the inside of the front panel assembly, remove the seven
screws AC and screw AC' attaching the microphone board.
Reference:
• When attaching the microphone board, align the projections
ab of the front panel assembly in the holes of the micro-
phone board before attaching the screws AC and AC'.
• When attaching the screw AC', attach the wire holder with it.
Fig.30
3.1.18 Removing the headphone board
(See Fig.31)
• Prior to performing the following procedures, remove the metal
cover and front panel assembly.
(1) From the inside of the front panel assembly, remove the
screw AD attaching the headphone board.
(2) Remove the wire holder fixing the wire and take out the
headphone board.
Reference:
After attaching the headphone board, fix the wire with the wire
holder.
3.1.19 Removing the cassette mechanism assembly
(See Fig.31)
• Prior to performing the following procedure, remove the metal
cover and front panel assembly.
(1) From the inside of the front panel assembly, remove the
two screws AE and two screws AF attaching the cassette
mechanism assembly.
Reference:
When attaching the cassette mechanism assembly, align the
projections (ac, ad) in the holes of the cassette mechanism as-
sembly.
Fig.31
Front panel assembly
ab
AC AC AC
AC'AC
Wire
Wire holde
r
ab
Microphone board
ab
Front panel assembly
AE AF
AF
AD
AE
Wire
ad
Wire holder
Cassette mechanism assembly
Headphone board
ac

(No.MB188)1-19
3.2 DVD changer mechanism assembly section
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
Afrom the top cover and release the two joints aon 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 bof the side (R) assembly. (See Figs.4
and 5.)
Note:
The tray can be locked if all tray assemblies are at-
tached.
(5) From the topside of the DVD changer mechanism assem-
bly, move the stopper tabs cin 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"3.2.15 Taking
out the disc in the play mode".
Fig.1
Fig.2
Fig.3
Fig.4
Fig.5
Top cove
r
Lifter assembly
Rods
A
a
a
A
aRods
Top cove
r
Lifter assembly
a
Open det. leve
r
b
Tray assemblies Side(R) assembly
c
Tray assembly

1-20 (No.MB188)
3.2.2 Removing the DVD servo board
(See Figs.6 to 8)
Caution:
Solder the short land sections don 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-
aged.
(1) From the topside of the DVD changer mechanism assem-
bly, solder the short land sections don 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, CN451) on the DVD servo board. (See Fig.7.)
(3) Disconnect the wires from the connectors (CN452, CN453)
on the DVD servo board. (See Fig.7.)
(4) Remove the screw Battaching the earth wire. (See Fig.7.)
Reference:
After attaching the earth wire, fix it with the spacer as be-
fore. (See Fig.7.)
(5) Remove the two screws Cattaching the DVD servo board.
(See Fig.7.)
(6) From the reverse side of the DVD servo board, release the
lock of the connector CN101 in the direction of the arrow
and disconnect the card wire. (See Fig.8.)
Caution:
Unsolder the solders from the short land sections dafter reas-
sembling. (See Fig.6.)
3.2.3 Removing the switch board
(See Fig.7)
• Prior to performing the following procedures, remove the DVD
servo board.
(1) From the bottom side of the DVD changer mechanism as-
sembly, remove the screw Dattaching the switch board to
the DVD changer mechanism assembly.
(2) Loosen the screw Eattaching the DVD traverse mecha-
nism assembly and take out the switch board while lifting
the section eof the DVD traverse mechanism assembly.
(3) Release the wires from the slots fof the switch board.
Reference:
When reassembling, pass the wire through the section gof the
DVD traverse mechanism assembly.
Fig.6
Fig.7
Fig.8
DVD pickup
DVD changer mechanism assembly
Short land sections d
D
DVD changer mechanism assembly
DVD servo board Card wire
E
C
B
C
CN451
CN452 CN453
Card wire
Wires
Switch board
e
DVD traverse mechanism assembly
CN201
g
f
Earth wire
DVD servo board
Lock
Card wire
CN101