JVC THM-508 Service manual
SERVICE MANUAL
DVD DIGITAL CINEMA SYSTEM
MB29420047
TH-M508
Area suffix
US ------------------------ Singapore
UW ----------- Brazil,Mexico,Peru
UX -------------------- Saudi Arabia
UG --- Turkey,South Africa,Egypt
UN ----------------------------- Asean
(SP-THM508C)
(SP-THM508F)
(XV-THM508)
(SP-THM505S)
(SP-PWM508)
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-34
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-36
COPYRIGHT © 2004 Victor Company of Japan, Limited
No.MB294
2004/7
SPECIFICATION
Center unit (XV-THM508)
Audio section Digital input*2 DIGITAL IN (DBS) (OPTICAL) -21 dBm to -15 dBm (660 nm E30 nm)
Video section Video System NTSC/PAL selectable
Horizontal Resolution 500 lines
Signal-to-Noise Ratio 64 dB
Video output level Composite 1.0 V(p-p)/75 Ω
S-video-Y 1.0 V(p-p)/75 Ω
S-video-C 0.286 V (0.3 V*3) (p-p)/75 Ω
Component-Y 1.0 V(p-p)/75 Ω
Component-PB/PR 0.7 V(p-p)/75 Ω
Video input sensitivity/
Impedance (VCR IN)
Tuner section Tuning Range FM 87.50 MHz to 108.00 MHz
General Power Requirements AC 110 - 240 V , 50/60 Hz (except for Australia)
Composite 1.0 V(p-p)/75 Ω
S-video-Y 1.0 V(p-p)/75 Ω
S-video-C 0.286 V (0.3 V*3) (p-p)/75 Ω
AM 531 kHz to 1 602 kHz (at 9 kHz intervals)
530 kHz to 1 600 kHz (at 10 kHz intervals)
AC 240 V , 50 Hz (for Australia only)
Power Consumption 18 W (at operation) 2.0 W (in standby mode)
Dimensions (W × H × D) 400 mm × 85 mm × 380 mm
Mass 4.3 kg
*1 : This value is measured at System cord CONNECTOR for reference.
*2 : Corresponding to Linear PCM, Dolby Digital, and DTS Digital Surround (with sampling frequency - 32 kHz, 44.1 kHz, 48 kHz)
*3 : For PAL system
Subwoofer (SP-PWM508)
Amplifier section Front/Center/Surround 140 W per channel, RMS at 4 Ω (Center/Surround)/ 140 W per channel, RMS at 4 Ω
(Front) at 1 kHz, with 10 % total harmonic distortion.
Subwoofer 300 W, RMS at 4 Ω at 100 Hz, with 10 % total harmonic distortion.
Speaker section Speaker unit 25 cm Bass-reflex, Magnetically Shielded
Frequency Range 20 Hz to 200 Hz
General Power Requirements AC 110 V/127 V/220 - 240 V selectable with the voltage selector, 50 Hz/60 Hz
Power Consumption 170 W (at operation) 0 W (in standby mode)
Dimensions (W × H × D) 256 mm × 482 mm × 460 mm
Mass 18.5 kg
Satellite Speakers-Front speakers (SP-THM508F)
Speakers Woofer 10.0 cm × 2
Tweeter 4.0 cm, Bass-reflex, Magnetically Shielded
Power Handling Capacity 140 W
Impedance 4 Ω
Frequency Range 60 Hz to 20 kHz
Dimensions (W × H × D) 250 mm × 1065.5 mm × 310 mm
Mass 7.2 kg
1-2 (No.MB294)
Satellite Speakers-Surround speakers (SP-THM505S)
Speakers 8.0 cm, Bass-reflex, Magnetically Shielded
Power Handling Capacity 140 W
Impedance 4 Ω
Frequency Range 80 Hz to 20 kHz
Dimensions (W × H × D) 111.5 mm × 139 mm × 106.5 mm
Mass 0.52 kg
Satellite Speakers-Center speaker (SP-THM508C)
Speakers Woofer 8.0 cm × 2
Tweeter 4.0 cm, Bass-reflex, Magnetically Shielded
Power Handling Capacity 140 W
Impedance 4 Ω
Frequency Range 65 Hz to 20 kHz
Dimensions (W × H × D) 326 mm × 119 mm × 170 mm
Mass 2.5 kg
Designs & specifications are subject to change without notice.
(No.MB294)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 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.
1-4 (No.MB294)
1.5 Preventing static electricity
r
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 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.
Short land sections
Connecto
Pickup
Traverse mechanism assembly
Flexible wire
(No.MB294)1-5
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.
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
WARNING LABEL
CAUTION : Visible and Invisible
laser radiation when open and
interlock failed or defeated.
AVOID DIRECT EXPOSURE TO
BEAM. (e)
CLASS 1
LASER PRODUCT
ADVARSEL : Synlig og usynlig
laserstråling når maskinen er
åben eller interlocken fejeler.
Undgå direkte eksponering til
stråling. (d)
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)
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)
VARO : Avattaessa ja suojalukitus
ohitettuna tai viallisena olet alttiina
näkyvälle ja näkymättömälle
lasersäteilylle. Vältä säteen
kohdistumista suoraan itseesi. (f)
1-6 (No.MB294)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
(No.MB294)1-7
SECTION 3
r
DISASSEMBLY
3.1 Main body section
3.1.1 Removing the metal cover
(See Figs.1 to 4)
(1) From the both sides of the main body, remove the four
screws A attaching the metal cover. (See Figs.1 and 2)
(2) From the back side of the main body, remove the three
screws B attaching the metal cover. (See Fig.3)
(3) Lift the rear section of the metal cover in the direction of the
arrow while extending the lower sections of the metal cover, release the five claws a using a longer screwdriver from
the inside as required. (See Fig.4)
Note:
Do not damage any parts and boards inside the main body
when releasing the claws a using a longer screwdriver.
Metal cover
A
Fig.1
Metal cover
A
Fig.2
B
Fig.3
Claws a Claws a
Metal cove
Metal cover
1-8 (No.MB294)
Fig.4
3.1.2 Removing the front panel assembly
(See Figs.5 and 6)
• Prior to performing the following procedures, remove the metal
cover.
(1) From the top side of the main body, disconnect the parallel
wires from the connectors (CN456
board. (See Fig.5)
(2) Disconnect the card wires from the connectors (CN450
) on the main board. (See Fig.5)
CN460
(3) Remove the screw C attaching the earth wire to the main
board. (See Fig.5)
Reference:
When attaching the screw C, attach the earth wire with
it. (See Fig.5)
(4) From the bottom side of the main body, remove the three
screws D attaching the front panel assembly. (See Fig.6)
(5) From the both and bottom sides of the main body, remove
the front panel assembly in the direction of the arrow while
releasing the joints b and c. (See Fig.6)
, CN457) on the main
Main board
,
CN456
CN450
CN457
CN460
C
Earth
wire
Card wire
Front panel assembly
Front panel assembly
Fig.5
Joint c Joint bJoint b
Parallel wires
Card wire
D
Fig.6
(No.MB294)1-9
3.1.3 Removing the DVD changer mechanism assembly
(See Fig.7)
• Prior to performing the following procedures, remove metal
cover and front panel assembly.
(1) From the top side of the main body, remove the screw E at-
taching the wire protection board to the main board.
(2) Take out the wire protection board, and disconnect the
card wires from the connectors (CN401
main board.
Reference:
When attaching the wire protection board, attach the
wire protection board after connecting the card wires to
the connectors (CN401
(3) Remove the four screws F attaching the DVD changer
mechanism assembly on the bottom chassis.
(4) Take out the DVD changer mechanism assembly in the up-
ward direction.
Reference:
When attaching the DVD changer mechanism assembly, align
the holes of the DVD changer mechanism assembly to the projections d on the bottom chassis.
3.1.4 Removing the rear panel
(See Fig.8)
• Prior to performing the following procedures, remove the metal
cover.
(1) From the back side of the main body, remove the screw G
and thirteen screws H attaching the rear panel.
to CN403) on the main board.
to CN403) on the
F
DVD changer mechanism assembly
Projections d
Wire protection board
F
G
F
E
Fig.7
CN402
Card wires
CN401
Bottom
chassis
CN403
Main
board
H
H
Rear panel
Fig.8
1-10 (No.MB294)
3.1.5 Removing the audio & digital input board
(See Figs.9 and 10)
• Prior to performing the following procedures, remove the metal
cover.
(1) From the top side of the main body, disconnect the card
wires from the connectors (CN411
board. (See Fig.9)
(2) Remove the screw J attaching the audio & digital input
board to the bracket(DSP). (See Fig.9)
(3) From the back side of the main body, remove the screw K
and three screws L attaching the audio & digital input board
to the rear panel. (See Fig.10)
(4) Take out the audio & digital input board from the main
body.
, CN412) on the main
Main board
Card wires
Bracket
(DSP)
CN412
CN411
N
Power supply board
3.1.6 Removing the tuner
(See Figs.9 and 10)
• Prior to performing the following procedures, remove the metal
cover.
(1) From the top side of the main body, disconnect the card
wire from the connector CN1
(2) From the back side of the main body, remove the two
screws M attaching the tuner to the rear panel. (See
Fig.10)
(3) Take out the tuner from the main body.
3.1.7 Removing the power supply board
(See Figs.9 and 10)
• Prior to performing the following procedures, remove the metal
cover.
(1) From the top side of the main body, disconnect the parallel
wires from the connectors (CN404
board. (See Fig.9)
(2) Remove the three screws N attaching the power supply
board. (See Fig.9)
(3) From the back side of the main body, remove the screw P
attaching the power supply board to the rear panel. (See
Fig.10)
(4) Take out the power supply board from the main body.
Reference:
Remove the rear panel as required. (See “3.1.4 Removing the
rear pane”)
on the tuner. (See Fig.9)
to CN407) on the main
J
CN407
CN406
CN1
Card wire
Audio & digital input board
CN405
Tuner
KP
N
CN404
Parallel wires
Fig.9
ML
Rear panel
Fig.10
(No.MB294)1-11
3.1.8 Removing the main board
(See Fig.11)
• Prior to performing the following procedures, remove the metal
cover, rear panel, audio & digital input board and tuner.
(1) From the top side of the main body, remove the screw Q
attaching the wire protection board to the main board.
(2) Take out the wire protection board, and disconnect the
card wires from the connectors (CN401
main board.
Reference:
When attaching the wire protection board, attach the
wire protection board after connecting the card wires to
the connectors (CN401
(3) Disconnect the card wires from the connectors (CN450
CN460) on the main board.
(4) Disconnect the parallel wires from the connectors (CN404
to CN407, CN456 and CN457) on the main board.
(5) Remove the two screws R and screw R’ attaching the main
board on the bottom chassis.
Reference:
When attaching the screw R’, attach the earth wire with
it.
(6) Take out the main board from the main body.
to CN403) on the main board.
to CN403) on the
and
Earth wire
R'
CN450
R
CN403
Main board
Bottom chassis
CN460 CN456
CN457
Q
CN404
CN407
Fig.11
Wire protection board
CN402CN401
CN406
CN405
1-12 (No.MB294)
3.2 Front panel assembly section
• Prior to performing the following procedures, remove the front panel assembly from the main body. (See “Removing the front panel
assembly”)
3.2.1 Removing the phone jack board
(See Fig.1)
(1) From the inside of the front panel assembly, remove the
screw A and screw A’ attaching the phone jack board.
Reference:
• When attaching the phone jack board, align the projections a of the front panel assembly to the holes of the
phone jack board.
• When attaching the screw A’, attach the earth wire
with it.
(2) Take out the phone jack board from the front panel assem-
bly.
3.2.2 Removing the connect board
(See Fig.1)
(1) From the inside of the front panel assembly, disconnect the
card wire from the connector (CN561
board.
(2) Remove the two screws B attaching the connect board.
Reference:
When attaching the connect board, align the projections
b of the front panel assembly to the holes of the connect
board.
(3) Take out the connect board from the front panel assembly.
) on the connect
Operation board
Earth wire
C
C
c
A' A
Projection a Projection a
Phone jack board
Connect board
Button (TOP)
Projection b
Fig.1
Front panel assembly
B
Projection b
CN561
3.2.3 Removing the operation board
(See Fig.1)
(1) From the inside of the front panel assembly, remove the
three screws C attaching the operation board.
Reference:
When attaching the operation board, align the projections c of the front panel assembly to the holes of the operation board.
(2) Take out the operation board with the button(top).
(No.MB294)1-13
3.2.4 Removing the front board
f
(See Figs.2 and 3)
• Prior to performing the following procedures, remove the operation board.
(1) From the front side of the front panel assembly, pull out the
volume knob in the direction of the arrow. (See Fig.2)
(2) From the inside of the front panel assembly, remove the
seven screws D attaching the front board. (See Fig.3)
Reference:
When attaching the front board, align the projections d of
the front panel assembly to the holes of the front board.
(See Fig.3)
(3) Take out the front board and remove the solder from the
soldered point e to remove the parallel wire. (See Fig.3)
Front panel assembly
Volume knob
Fig.2
Projections d Projection d Solder point c
3.2.5 Removing the power key board
(See Fig.4)
(1) From the inside of the front panel assembly, remove the
two screws E attaching the power key board.
Reference:
When attaching the power key board, align the projections f of the front panel assembly to the holes of the
power key board.
(2) Take out the power key board and remove the solder from
the soldered point g to remove the parallel wire.
D
Front board
D
D
D
Front panel assembly
Fig.3
Solder poitn g
Front panel assembly Parallel wire
Projection f
Parallel wire
Projection
E
E
1-14 (No.MB294)
Power key board
Fig.4
3.2.6 Removing the illumination board
r
(See Figs.5 and 6)
(1) Open the DVD door of the front panel assembly and re-
move the three screws F attaching the door holder to the
DVD door. (See Fig.5)
(2) Remove the DVD door from the door holder. (See Fig.5)
(3) From the inside of the DVD door, disconnect the card wire
from the connector CN551
Fig.6)
(4) Take out the illumination board from the DVD door.
on the illumination board. (See
Door holder
Front panel assembly
DVD door
Fig.5
Door holder
CN551
Illumination board
Fig.6
F
Card wire
DVD doo
(No.MB294)1-15
3.3 DVD changer mechanism assembly section
r
• Prior to performing the following procedures, remove the metal
cover, front panel assembly and the DVD changer mechanism
assembly.
3.3.1 Removing the tray assemblies
(See Figs.1 to 5)
(1) 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 Fig.4)
Attention:
The tray can be locked if all tray assemblies are attached.
(5) From the top side 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 Figs.4 and 5)
Caution:
Remove the tray assembly from top tray 5 in order.
Attention:
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".
Top cover
Stopper tab c
Tray assembly
Tray assembly
Fig.3
b
Fig.4
Open det leve
Side (R) assembly
A
Joint a
Lifter assembly
Joint a
Fig.1
Rods
Joint a
Rods
Top cover
Joint a
A
Stopper tab c
Fig.5
Lifter assembly
1-16 (No.MB294)
Fig.2
3.3.2 Removing the DVD servo board
(See Figs.6 to 8)
• Prior to performing the following procedures, remove the tray
assemblies.
(1) From the topside of the DVD changer mechanism assem-
bly, solder the short-circuit points d on the DVD pick up.
(See Fig.6)
Caution:
Solder the short-circuit points d on the DVD pickup before disconnecting the flexible wire extending from the
DVD pickup. If you do not follow this instruction, the DVD
pickup may be damaged.
(2) From the bottom side of the DVD changer mechanism as-
sembly, disconnect the card wires from the connectors
and CN451 and the wires from the connectors
CN201
and CN453 on the DVD servo board. (See Fig.7)
CN452
(3) Remove the two screws B attaching the bracket to the DVD
changer mechanism assembly, and reverse the DVD servo
board. (See Fig.7)
(4) From the reverse side of the DVD servo board, disconnect
the card wire from the connector CN101
the arrow 1 on the DVD servo board. (See Fig.8)
(5) Take out the DVD servo board.
Caution:
Unsolder the solders from the short-circuit points d after reassembling.
Reference:
When connecting the card wire to the connector CN201
wire through the slots e.
3.3.3 Removing the switch board
(See Fig.7)
(1) From the bottom side of the DVD changer mechanism as-
sembly, disconnect the wires from connectors CN452
CN453 on the DVD servo board.
(2) Remove the screw C attaching the switch board to the DVD
changer mechanism assembly.
(3) Release the wires from the slots f of the switch board.
Caution:
When reassembling, let the wires through the slots f of the
switch board.
in the direction of
, let the
and
Short circuit points d
DVD changer mechanism assembly
Fig.6
DVD changer mechanism assembly
CN452
Card
wire
B
CN451
B
CN201
Fig.7
DVD changer mechanism assembly
DVD pickup
CN453
DVD servo board
Switch board
C
Slot f
Slot e
Card wire
DVD servo board
11
Fig.8
CN101
Card wire
(No.MB294)1-17
3.3.4 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)
Caution:
Take care not to attach grease on the belt.
(2) Remove the four screws D attaching the motors to the
chassis 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
motor board. (See Fig.10)
Caution:
• When connecting the card wire, let the card wire through the
slots g of the motor board. (See Fig.10)
• When reattaching the motor, turn the side where the label
should be put to the front side. (See Fig.10)
Reference:
You need not to remove the tray assemblies, and in such case,
move it.
on the motor board from the
on the
D
Motor
Labels
Motor
Motor pulleys
Fig.9
Motors
Motor board
BeltBelt
D
Chassis assembly
3.3.5 Removing the motor
(See Fig. 10)
• Prior to performing the following procedures, remove the motor
board.
(1) From the reverse side of the motor board, unsolder the four
soldered sections h on the motor board.
(2) From the forward side of the motor board, remove the mo-
tors.
3.3.6 Removing the DVD traverse mechanism assembly
(See Fig.11)
• Prior to performing the following procedures, remove the tray
assemblies.
(1) From the top side of the DVD changer mechanism assem-
bly, disconnect the card wire from the connector CN451
the DVD servo board.
(2) Disconnect the wires from the connectors CN452
on the DVD servo board.
CN453
(3) Remove the three screws F attaching the DVD traverse
mechanism assembly.
(4) Take out the DVD traverse mechanism assembly with DVD
servo board from the DVD changer mechanism assembly.
on
and
Soldered sections h
E
CN2
CN1
Slots g
DVD changer mechanism assembly
Fig.10
DVD changer mechanism assembly
Card wire
CN451
F
Motor board
E
Motors
Card wire
CN452
CN453
DVD servo board
1-18 (No.MB294)
DVD traverse mechanism assembly
F
Fig.11
3.3.7 Removing the DVD pickup
r
(See Figs.12 to 14)
• Prior to performing the following procedures, remove the tray
assemblies and DVD traverse mechanism assembly.
(1) From the topside of the DVD traverse mechanism assem-
bly, solder the short-circuit points i on the DVD pick up.
(See Fig.12)
Caution:
Solder the short-circuit points i on the DVD pickup before
disconnecting the flexible wire extending from the DVD
pickup. If you do not follow this instruction, the DVD pickup may be damaged.
(2) Disconnect the flexible wire from the connector on the DVD
pickup. (See Fig.12)
(3) 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)
(4) Remove the screw G attaching the gear holder. (See
Fig.12)
(5) Remove the screw H attaching the SS adj. spring. (See
Fig.12)
(6) Move the DVD pickup in the direction of the arrow and re-
move the screw shaft from the section j on the screw shaft
holder. (See Fig.13)
(7) Remove the section k of the DVD pickup from the guide
shaft. (See Fig.13)
(8) Remove the two screws J attaching the rack arm to the
DVD pickup. (See Fig.14)
(9) Pull the screw shaft from the DVD pickup in the direction of
the arrow. (See Fig.14)
Short circuit points i
DVD traverse
mechanism assembly
Connector
Screw shaft
gear
1
Gear holder DVD pickup
Fig.12
DVD pickup
Section k
Flexible wire
2
SS adj. spring
HG
Guide shaft
3.3.8 Attaching the DVD pickup
(See Figs.12 to 14)
(1) Attach the screw shaft to the DVD pickup and attach the
rack arm with the screws J. (See Fig.14)
Reference:
After attaching the screw shaft to the DVD pickup, attach
the screw shaft collar to the screw shaft. (See Fig.14)
(2) Attach the section k of the DVD pickup to the guide shaft
first and attach the screw shaft to the section j on the screw
shaft holder. (See Fig.14)
(3) Attach the SS adj. spring and gear holder with the screws
G and H. (See Fig.12)
(4) Turn the screw shaft gear to move the DVD pickup toward
the left. (See Fig.12)
(5) Connect the flexible wire to the connector on the DVD pick-
up. (See Fig.12)
Caution:
Unsolder the solders from the short-circuit points i after connecting the flexible wire.
Screw shaft Screw shaft holder
Fig.13
DVD pickup
Rack arm
Screw shaft colla
J
Screw shaft
Fig.14
Section j
(No.MB294)1-19
3.3.9 Removing the spindle motor board
(See Figs.15 and 16)
• Prior to performing the following procedures, remove the tray
assemblies and DVD traverse mechanism assembly.
(1) From the topside of the DVD traverse mechanism assem-
bly, remove the four screws K attaching the DVD traverse
mechanism assembly to the DVD traverse mechanism
base. (See Fig.15)
(2) Remove the wires from the soldered section m on the spin-
dle motor board. (See Fig.15)
(3) Remove the screw L attaching the spindle motor board.
(See Fig.15)
(4) From the bottom side of the DVD traverse mechanism as-
sembly, remove the three screws M attaching the spindle
motor board. (See Fig.16)
Reference:
When attaching the spindle motor board, let the card wire
through the hole n on the motor base. (See Fig.15)
Hole n
L
Section m
Wires
K
Card wire
Motor base
Spindle motor board
K
DVD traverse mechanism base
DVD traverse mechanism assembly
Fig.15
K
3.3.10 Removing the feed motor
(See Figs.17 and 18)
• Prior to performing the following procedures, remove the tray
assemblies, DVD traverse mechanism assembly, DVD pickup
and spindle motor board.
• Remove the wires of the feed motor as required.
(1) Remove the middle gear in the direction of the arrow. (See
Fig.17)
(2) Remove the screw N and screw P attaching the motor
base.
(3) Remove the screw Q attaching the feed motor to the motor
base. (See Fig.18)
(4) Take out the feed motor from the motor base.
Reference:
After attaching the feed motor, let the wires through the sections p and q on the motor base. (See Fig.17)
M
Motor base
Middle
gear
Section p
N
P
Feed motor
Fig.16
Feed motor
Section q
Traverse mechanism chassis
Fig.17
1-20 (No.MB294)
Motor base
Q
Fig.18
3.3.11 Removing the side (L) assembly and tray switch board
r
(See Figs.19 to 23)
• Prior to performing the following procedures, remove the tray
assemblies.
(1) From the topside of the DVD changer mechanism assem-
bly, remove the two screws R attaching the side (L) assembly. (See Fig.19)
(2) From the left side of the DVD changer mechanism assem-
bly, removing the spacer fixing the tray switch board and
motor board. (See Fig.20)
(3) Disconnect the connector CN3
from the motor board and detach the side (L) assembly in
an upward direction. (See Fig.20)
(4) Remove the screw S attaching the tray switch board to the
side (L) assembly. (See Fig.21)
(5) Release the joint tab r of the side (L) assembly in the direc-
tion of the arrow 1 and release the joint tab s while removing the tray switch board in the direction of the arrow 2.
(See Fig.21)
Reference:
After attaching the tray switch board to the motor board, fix
them with spacers.
Side (L) assembly
on the tray switch board
R
Side (L) assembly
Side (R) assembly
Tray switch board
Fig.21
Joint tab
1
2
Joint tab s
S
Tab s
R
Fig.19
Motor board
R
R
CN3
Spacer
Side (L) assembly
Fig.22
Elevator spring
Gear
Side (R) assembly
Hook u
Gear cover
Elevator cam
Chassis assembly
Fig.23
Side (L) assembly
Fig.20
(No.MB294)1-21
3.3.12 Removing the side (R) assembly
r
(See Fig.22 to 26)
• Prior to performing the following procedures, remove the tray
assemblies and DVD servo board.
• When removing the DVD servo board, it is not necessary to re-
move the DVD servo board from the bracket.
(1) From the inside of the side (R) assembly, release the two
tabs t of the gear cover and remove the gear cover outward. (See Figs.22 and 23)
(2) From the right side of the DVD changer mechanism as-
sembly, remove the elevator spring attached to the hook u
of the chassis assembly. (See Figs.23 and 24)
(3) From the topside of the DVD changer mechanism assem-
bly, turn the gear 1 clockwise to move the elevator cam
rearward. (See Fig.24)
(4) Move the two slots v and joint w of the elevator cam and
remove the elevator cam outward. (See Fig.24)
(5) Remove the three screws T and detach the side (R) as-
sembly upward. (See Figs.25 and 26)
Caution:
When reattaching the side (R) assembly, make sure to fit the
shaft section x into the slot of the select lever. (See Fig.25)
T
Elevator spring
Slot v
T
Joint w
Fig.24
Section x
Hook u
Elevator cam
Slot v
Select leve
T
Side (R) assembly
Fig.25
T
T
1-22 (No.MB294)
Side (R) assembly
Fig.26
3.3.13 Removing the lifter assembly
(See Figs.27 to 31)
• Prior to performing the following procedures, remove the tray
assemblies, DVD servo board, side (L) assembly and side (R)
assembly.
• When removing the DVD servo board, it is not necessary to re-
move the DVD servo board from the bracket.
(1) From the topside of the DVD changer mechanism assem-
bly, turn the gear 1 clockwise to move the lifter assembly
upward. (See Figs.27 and 28)
(2) Turn the gear 2 clockwise to move the hook toward the
front until it stops. (See Figs.27 and 28)
(3) Move the hook stopper in the direction of the arrow 2 while
pushing the tab y of the hook stopper to unlock it in the direction of the arrow 1 and release four joints z to detach
from the rack holder. (See Fig.29)
(4) Release the rod from part aa. (See Fig.29)
(5) Turn the gear 1 clockwise again to move the lifter assembly
upward. (See Fig.30)
(6) Remove the lifter assembly from the DVD changer mecha-
nism assembly upward at the positions ab where the four
pins on the both sides of the lifter assembly fit to the notch-
es of the chassis assembly. (See Fig.30)
(7) Move the lifter assembly in the direction of the arrow and
release it from the hook. (See Fig.31)
Hook stopper
Gear 2
Joint z
Rack holder
Joint z
1
Ta b y
Joint z
Fig.29
Lifter assembly
Gear 1
Hook
Joint z
2
Hook stopper
Joints
Joint
Rod (L)
ab
aa
Hook
Gear 2
Lifter assembly
Fig.27
Gear 1
Gear 1
Joints ab
Chassis assembly
Fig.30
Lifter assembly
Lifter assembly
Hook
Hook stopper
Fig.31
Hook
Fig.28
(No.MB294)1-23
3.3.14 Removing the rack holder assembly and sensor assembly
r
r
(See Figs.32 to 38)
• Prior to performing the following procedures, remove the tray
assemblies, side (L) assembly, side (R) assembly and lifter assembly.
Reference:
If the slide gear of the DVD changer mechanism assembly
places at joint ac of the rack holder assembly, turn the gear 1
counterclockwise to move the slide gear in the direction of the
arrow. Then remove the rack holder assembly. (See Figs.32
and 33)
(1) Remove the three screws U attaching the rack holder as-
sembly and release joint ac from the notch ad. (See
Figs.32 and 34)
Caution:
When reattaching the rack holder assembly, do not nip
the wires extending from the sensor assembly. (See
Fig.32)
(2) Remove the two screws V attaching the sensor assembly.
(See Figs.35 and 38)
(3) Move the sensor assembly in the direction of the arrow to
release from the joint section ae. (See Figs.35 and 38)
(4) Remove the sensor spring attached to the bottom of the
sensor assembly from the boss af on the sensor slider.
(See Figs.35 and 36)
(5) Remove the screw W and X attaching the sensor board
and SV. resister respectively. (See Fig.37)
Reference:
Remove the solder from the solder point ai on the sensor
board as required. (See Fig.37)
Caution:
• When reattaching the SV. resister, attach the sensor slider
to the sensor bracket and fit the lever on the bottom of the
SV. resister into slot aj of the sensor slider. (See Figs.36 and
37)
• When reattaching the rack holder assembly, turn the gear 1
clockwise to move the slide gear and slide lever inside the
body in the direction of the arrow. (See Figs.32 and 38)
• Let the wire extending from the sensor assembly through
notch ag to the bottom of the DVD changer mechanism assembly. (See Figs.35 and 38)
•Fit pin ak of the slide lever into hole ah of the sensor slider
on the bottom of the sensor assembly while attaching the
sensor spring to the boss af of the sensor slider. (See
Figs.36 and 38)
• Joint section ae of the sensor assembly to the notch am of
the DVD changer mechanism assembly. (See Figs.35 and
38)
U
Wires
Slide gear
Slide gear
U
Rack holder assembly
Joint ac
U
Fig.32
Joint ac
Fig.33
Gear 1
Rack holde
assembly
Rack holde
assembly
1-24 (No.MB294)
Notch ad
Joint ac
Fig.34
Notch ag
r
Sensor assembly
Sensor assembly
Boss af
V
V
V
Boss af
V
Slot aj
Sensor slider
Joint ae
Fig.35
Hole ah
Sensor slide
Sensor spring
Joint ae
Slide gear
Notch am
Pin ak
Sensor spring
Hole ah
Notch ag
Slide lever
Fig.38
Slot aj
SV. resister
Sensor slider
Boss af
Fig.36
Fig.37
Sensor spring
WX
Solder point ai
Sensor bracket
Sensor board
(No.MB294)1-25
3.3.15 Taking out the disc in the play mode
r
(See Fig.39 to 42)
Reference:
Refer to "Removing the tray assemblies".
(1) From the topside of the DVD changer mechanism assem-
bly, remove the top cover.
(2) Unlock the tray assemblies and draw out the tray assem-
blies toward the front.
(3) From the top side of the DVD changer mechanism assem-
bly, turn the gear 1 clockwise to move the lifter assembly
upward. (See Fig.39)
(4) Turn the gear 2 clockwise to move the sub tray remaining
inside the lifter assembly toward the front, then pull out.
(See Fig.39)
(5) Take out the disc on the sub tray. (See Fig.40)
(6) After clearing away the disc, insert the sub tray into the
main tray. (See Fig.41)
Caution:
When reattaching the sub tray, move the tray stopper on
the bottom of the main tray in the direction of the arrow
to lock the sub tray certainly. (See Figs.41 and 42)
(7) Push the tray assembly toward the body and reattach.
Tray assemblies
Tray assembly
Tray stopper
Disc
Sub tray
Fig.40
Main tray
Gear 2
Gear 1
Sub tray
Sub tray
Fig.41
Tray stoope
Fig.39
1-26 (No.MB294)
Fig.42
3.4 Speaker section
3.4.1 Removing the amplifier assembly
(See Figs.1 to 3)
(1) From the back side of the speaker main body, remove
three screws A attaching the amplifier assembly. (See
Fig.1)
(2) From the bottom side of the speaker main body, remove
the eight screws B attaching amplifier assembly. (See
Fig.2)
(3) From the top side of the speaker main body, move the am-
plifier assembly backward and disconnect the wire from the
connector CN204
on the amplifier board. (See Fig.3)
B
3.4.2 Removing the rear panel
(See Figs.3 and 4)
• Prior to performing the following procedure, remove the ampli-
fier assembly.
(1) From the back side of the amplifier assembly, remove the
four screws C, screw D and two screws E attaching the rear
panel. (See Fig.4)
(2) From the top side of the amplifier assembly, take out the
rear panel with fan motor, and disconnect the wire from the
connector CN202
3.4.3 Removing the fan motor
(See Fig.4)
• Prior to performing the following procedures, remove the am-
plifier assembly and rear panel.
(1) From the front side of the rear panel, remove the four
screws F attaching the fan motor.
(2) Take out the fan motor.
on the amplifier board. (See Fig.3)
A
Speaker main body
Fig.2
CN202
B
CN204
Amplifier assembly
Fig.1
Amplifier assembly
F
D
E
Fig.3
F
Fig.4
Amplifier board
C
C
Amplifier assembly
(No.MB294)1-27
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