Page 1
MB055200311
SERVICE MANUAL
DVD DIGITAL CINEMA SYSTEM
TH-A55
Area suffix
US ---------------------- Singapore
UB --------------------- Hong Kong
UP ---------------------------- Korea
UW ---------- Brazil,Mexico,Peru
UX ------------------- Saudi Arabia
UG - Turkey,South Africa,Egypt
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25
SP-THA55SSP-THA55FSP-THA55CSP-PWA55XV-THA55
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITED
No.MB055
2003/12
Page 2
SPECIFICATION
Center Unit
Audio Audio Input Sensitivity/Impedance (1 kHz), Total Harmonic Distortion 0.01%
Analog input AUX IN VCR 360 mV/47 kΩ
Digital input* DIGITAL IN
(DBS) (OPTICAL)
* Corresponding to Linear PCM, Dolby Digital, and DTS Digital Surround (with sampling frequency - 32 kHz, 44.1 kHz, 48 kHz).
Video Color System NTSC/PAL selectable
Horizontal Resolution 500 lines
Signal-to-Noise Ratio 64 dB(Composite signal when "RGB" is selected)
Video Output Level Composite video 1 V(p-p)/75 Ω
S-video (Y: luminance) : 1 V(p-p)/75 Ω
Tuner Tuning Range FM 87.5 MHz to 108.0 MHz
AM 531 kHz to 1 602 kHz (at 9 kHz intervals)
General Power Requirements AC 110 ? 230 V , 50 Hz/60 Hz (except for Hong Kong)
Power Consumption 20 W (at operation) 2.5 W (in standby mode)
Dimensions (W × H × D) 398 mm × 70 mm × 265 mm
Mass 2.7 kg
Amplifier Front/Center/Surround 80 W per channel, RMS at 6 Ω at 1kHz, with 10% total harmonic distortion.
Subwoofer 100 W, RMS at 4 Ω at 100Hz, with 10% total harmonic distortion.
General Power Requirements AC 110 V/127 V/220 ? 230 V selectable with the voltage selector, 50 Hz/60 Hz
Power Consumption 150 W (at operation) 0 W (in standby mode)
Dimensions (W × H × D) 235 mm × 335 mm × 492 mm
Mass 13.0 kg
Satellite Power Handing Capacity 80W
Impedance 6 Ω
Dimensions (W × H × D) 250 mm × 1103 mm × 250 mm
Mass 3.77 kg
Center Power Handing Capacity 80W
Impedance 6 Ω
Dimensions (W × H × D) 258 mm × 75 mm × 81 mm
Mass 0.95 kg
Designs & Specifications are subject to change without notice.
-21 dBm to -15 dBm (660 nm ±30 nm)
(C: chrominance, burst) : 0.286 V(p-p)/75 Ω
530 kHz to 1 600 kHz (at 10 kHz intervals)
AC 220 V , 50 Hz (for Hong Kong only)
Subwoofer
(except for Hong Kong)
AC 220 V , 50 Hz (for Hong Kong only)
Sparker
1-2 (No.MB055)
Page 3
SECTION 1
PRECAUTION
1.1 Safety Precautions
(1) This design of th is product contains special hardw are 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 exposed 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 resp onsibility 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 compone nts 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.
(No.MB055)1-3
Page 4
1.5 Preventing static electricity
1.5.1 Grounding to prevent damage by 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.
1.5.2 About the earth processing for the destruction prevention by static electricity
Static electricity in the work area can destroy the optical pickup (laser dio de) in devices such as DVD players.
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 sh eet) 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
Conductive material
(conductive sheet) or iron plate
1.5.3 Handling the optical pickup
(1) In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical pick-
up are shorted. After replacement, return the shorted parts to their orig inal condition. (Refer to the text.)
(2) Do not use a tester to che ck the condition of the laser diode in the optical pickup. T he tester's internal power source can easily
destroy the laser diode.
1.5.4 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) Remove solder of the short lands on the flexible wire after replacing the optical pickup. For specific details, refer to the replace-
ment 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 wire carefully as it may break when subjected to strong force.
(4) It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.
1.5.5 Attention when traverse unit is decomposed
*Please refer to "Disassembly method" in the text for the DVD pickup.
• Apply solder to the short circuit points before the flexible wire is disconnected from the connector on the DVD pickup.
(If the flexible wire is disconnected without applying solder, the DVD pickup may be destroyed by static electri city.)
• In the assembly, be sure to remove solder from the short circuit points after connecting the flexible wire.
Flexible wire
Short land sections
DVD mechanism assembly
CN101
DVD servo board
1-4 (No.MB055)
Page 5
1.6 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 compact disc 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.
VARNING
Osynlig laserstrålning är denna del är öppnad osh spårren är
urkopplad. Betrakta ej strålen.
VARO
Avattaessa ja suojalukitus ohitettaessa olet alttiina näkymättömälle lasersäteilylle. Älä katso säteeseen.
REPRODUCTION AND POSITION OF LABELS
(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 herein may result in
hazardous radiation exposure.
CAUTION
Please use enough caution not to see the beam directly
or touch it in case of an adjustment or operation check.
ADVARSEL
Usynlig laserstråling ved åbning, når sikkerhedsafbrydere er
ude af funktion. Undgå udsasttelse for stråling.
ADVARSEL
Usynlig laserstråling ved åpning, når sikkerhetsbryteren er
avslott. Unngå utsettelse for stråling.
CLASS 1
LASER PRODUCT
CAUTION LABEL
(No.MB055)1-5
Page 6
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
1-6 (No.MB055)
Page 7
SECTION 3
DISASSEMBLY
3.1 Main body section
3.1.1 Removing the top panel
(See Fig.1)
(1) From the top side of the main body, remove the four screws
A attaching the top panel.
(2) Remove the top panel from main body.
3.1.2 Removing the rear cover
(See Figs.2 and 3)
• Prior to performing the following procedures, remove the top
panel.
(1) From the rear side of the main body, remove the three
screws B attaching the rear cover. (See Fig.2)
(2) From the top side of the main body, remove the two screws
C and two screws D attaching the rear cover. (See Fig.3)
(3) Remove the rear cover upward.
Top panel
AA
Fig.1
Rear cover
3.1.3 Removing the rear panel
(See Fig.4)
• Prior to performing the following procedures, remove the top
panel and rear cover.
(1) From the rear side of the main body, remove the eight
screws E and screw F attaching the rear panel.
(2) Remove the rear panel from main body.
B
Fig.2
D
C
Rear cover
Fig.3
C
FE
E
Rear panel
Fig.4
(No.MB055)1-7
Page 8
3.1.4 Removing the front panel assembly
(See Figs.5 and 6)
• Prior to performin g the following procedures, remove the top
panel.
(1) From the top side of the head phone board, remove the
three screws G attaching the front panel assembly. (See
Fig.5)
(2) Disconnect the card wires from the connectors CN408
on the main board. (See Fig.5)
CN412
(3) Extend the side of the front panel assembly in the direction
of the arrows a. (See Fig.5)
(4) Remove the front panel assembly in the direction of the ar-
rows c, while releasing the claw b. (See Fig.6)
and
G
Main board
Fig.5
Front panel
assembly
aa
CN412
G
CN408
Head phone
board
Front panel
assembly
3.1.5 Removing the DVD mechanism assembly
(See Figs.7 and 8)
• Prior to performin g the following procedures, remove the top
panel and rear cover.
(1) From the top side of the main body, remove the two screws
H and screw J on the DVD mechanism assembly. (See
Fig.7)
(2) Disconnect the connectors CN502
servo board from the connectors CN405
main board while lifting the DVD mechanism assembly upward. (See Fig.8)
(3) Take out the DVD mechanism assembly from the main
board.
and CN503 on the DVD
and CN406 on the
c
DVD servo
board
CN502
H
Fig.6
J
Fig.7
claw
c
DVD mechanism
assembly
DVD mechanism
assembly
CN503
b
1-8 (No.MB055)
CN406
Fig.8
CN405
Main board
Page 9
3.1.6 Removing the DSP board
(See Figs.9 and 10)
• Prior to performing the following procedures, remove the top
panel and rear cover.
(1) From the top side of the DSP board, disconnect the card
wires from the connectors CN401
Fig.10)
(2) Remove the screw K attaching the DSP board from the
section d of the barrier. (See Fig.10)
(3) From the back side of the mai n body, remove the screw L
and two screws M attaching the DSP board. (See Fig.9)
Reference:
• When attaching the DSP board, hang the DSP board on the
section d of the barrier. (See Fig.10)
3.1.7 Removing the tuner
(See Figs.9 and 11)
• Prior to performing the following procedures, remove the top
panel, rear cover and DSP board.
(1) From the top side of the tuner, disconnect the card wire
from the connector CN1
(2) From the back side of the main body, remove the two
screws N attaching the tuner. (See Fig.9)
(3) Take out the tuner from the main body.
on the tuner. (See Fig.11)
on the DSP board. (See
LM
N
Section d
K
CN401
Rear panel
Fig.9
DSP board
Tuner
Fig.10
CN1
Fig.11
(No.MB055)1-9
Page 10
3.1.8 Removing the main board
(See Fig.12)
• Prior to performin g the following procedures, remove the top
panel, rear cover, rear panel, DVD mechanism, DSP board
and tuner.
(1) From the top side of th e main board, disconnect the card
wires from the connectors CN408
board.
(2) From the top side of the power board, disconn ect the card
wires from the connectors CN901
board.
(3) Remove the three screws P attaching the main board.
(4) Take out the main board from the main bod y.
Reference:
• After connecting the wire to the connectors CN901
on the power board, bundle the wire by the wire
CN902
clamp.
3.1.9 Removing the power board
(See Fig.13)
• Prior to performin g the following procedures, remove the top
panel, rear cover and rear panel.
(1) From the top side of the main bod y, disconnect the card
wires from the connectors CN901
board.
(2) Remove the four screws Q attaching the power board.
(3) Take out the power board from the bottom chassis.
Reference:
• Remove the front panel assembly and DVD mechanism as-
sembly as required.
• After connecting the wire to the connectors CN901
CN902 on the power board, bundle the wire by the wire
clamp.
and CN412 on the main
and CN902 on the power
and
and CN902 on the power
and
CN412
P
CN408
Wire clamp
Fig.12
P
Main board
CN901
CN902
Power board
Q
CN901
CN902
1-10 (No.MB055)
Power board
Wire clamp
Q
Fig.13
Page 11
3.2 Front panel assembly section
• Prior to performing the following procedures, remove the top
panel and front panel assembly.
3.2.1 Removing the FL board
(See Figs.1 and 2)
(1) From the inside of the FL board, disconnect th e wire from
the connector CN502
(2) Remove the FL board in the direction o f the a rrow e, while
lifting the claws f upward. (See Fig.1)
(3) Take out the FL board from front panel assembly.
Reference:
• Before attaching the FL board, be careful not to damage the
projection part g.
• Before attaching the FL board, insert FL board in the section
h.
3.2.2 Removing the head phone board
(See Fig.1)
• Remove the screw R attaching the head phone board, take out
the head phone board.
on the volume board. (See Fig.2)
R
Head phone board
Projection part g
Claw f
FL board
e
Fig.1
e
Claw f
3.2.3 Removing the switch board
(See Fig.3)
• Prior to performing the following procedures, remove the FL
board.
• Remove the two screws S attaching the switch board, take out
the switch board.
3.2.4 Removing the volume boar d
(See Fig.3)
• Prior to performing the following procedures, remove the FL
board.
• Remove the two screws T attaching the volume board, take out
the volume board.
Claw
f Claw f
Section h
Switch board Volume board
S
CN502
FL board
Fig.2
T
Fig.3
(No.MB055)1-11
Page 12
3.3 DVD mechanism section
• Prior to performing the following procedures, remove the top plate
and rear cover, and remove the DVD mechanism assembly.
3.3.1 Removing the tray
(See Figs.1 and 2)
(1) From the left side of the DVD mechanism assembly, push
the slide cam in the direction of the arrow 1 and then pull
out the tray in the direction of the arrow 2. (See Fig.1)
(2) Push the tray stoppers a in the direction of the arrow 3, pull
out the tray in the direction of the arrow 4. (See Fig.2)
3.3.2 Attaching the tray
(See Fig.2)
When attaching the tray, insert the tray to the rail of the DVD
mechanism assembly and then push the tray in the DVD mechanism assembly.
Tray
2
1
Slide cam
Fig.1
Tray stoppers a
3
4
Tray
3.3.3 Removing the DVD servo board
(See Fig.3)
(1) From the bottom side of the DVD mechanism assembly,
disconnect the card wires from the connectors CN201
on the DVD servo board.
CN202
Caution:
disconnecting the flexible wire from connector CN101
the DVD servo board.
If the flexible wire is disconnected without attaching solder, the DVD pickup unit may be destroyed by static
electricity.
(2) Release the locks of the connector CN101
of the arrow 1) on the DVD servo board, disconnect the
flexible wire.
(3) Release the locks of the connector CN101
vo board in the direction of the arrow 1, disconnect the flexible wire.
Caution:
In the assembly, be sure to remove solders from the
short land sections b after connecting the flexible wire to
the connector CN101
(4) While pushing the claw c of the DVD mechanism assembly
in the direction of the arrow 2, remove the DVD servo board
in an upward direction.
on the DVD servo board.
(in the direction
on the DVD ser-
and
on
Card wire
CN201
Claw c
DVD mechanism assembly
Fig.2
Flexible wire
Short land sections b
DVD mechanism assembly
11
2 22
Card wire
CN202
Claw c
1-12 (No.MB055)
DVD servo board
CN101
Fig.3
Page 13
3.3.4 Removing the clamper base
(See Fig.4)
(1) From the top side of the DVD mechan ism assembly, re-
move the four screws A attaching the clamper base.
(2) Remove the clamper base from the bosses d of the loading
base in an upward direction, remove the clamper base
from the sections e while sliding it in the direction of the arrow.
Boss d
Clamper base
AA
Section e
3.3.5 Removing the tray drive board
(See Fig.5)
• Prior to performing the following procedures, remove the
clamper base.
(1) From the bottom side of the DVD mechanism assembly, re-
move the solders from the soldered sections f on the tray
drive board.
(2) Remove the screw B attaching the tray drive board to the
DVD mechanism assembly.
Boss d
Connector
A A
Fig.4
Card wire
Soldered
sections f
Loading base
Section e
DVD mechanism assembly
Motor
B
Tray drive board
Fig.5
(No.MB055)1-13
Page 14
3.3.6 Removing the motor
(See Fig.6)
• Prior to performing the following procedures, remove the
clamper base and tray drive board.
(1) From the top side of the DVD mechanism assembly, re-
move the belt of the pulley gear.
Note:
Take care not to attach grease on the belt.
(2) Remove the screw C attaching the motor to the DVD mech-
anism assembly.
3.3.7 Removing the DVD traverse mechanism assembly
(See Fig.7)
• Prior to performing the following procedures, remove the DVD
servo board and clamper base.
(1) From the top side of the DVD mechanism assembly, re-
move the four screws D attaching the DVD traverse mechanism assembly to the loading base.
(2) Take out the DVD traverse mechanism assembly from the
loading base.
Pulley gear
DVD mechanism assembly
Belt
C
Motor
Fig.6
DVD traverse mechanism assembly
D D
1-14 (No.MB055)
DD
Fig.7
Loading base
Page 15
3.3.8 Removing the DVD pickup unit
t
t
w
(See Figs.8 to 10)
• Prior to performing the following procedures, remove the DVD
servo board, clamper base and DVD traverse mechanism assembly.
(1) From the top side of the DVD traverse mechanism assem-
bly, remove the screw E attaching the plate and torsion
spring. (See Fig.8)
(2) Remove the shaft from the section g and then remove the
shaft from the section h. (See Fig.9)
(3) Disengage the section i of the DVD pickup unit and then re-
move the DVD pickup unit with the shaft. (See Fig.9)
(4) Pull the shaft out of the DVD pickup unit. (See Fig.10)
(5) Remove the two screws F attaching the SW. actuator. (See
Fig.10)
DVD pickup unit
Section i
Section h
Shaf
Section g
Fig.9
3.3.9 Attaching the DVD pickup unit
(See Figs.8, 10 to 12)
Reference:
Refer to the explanation of "Removing the DVD pickup unit" on
the preceding page.
(1) Attach the SW. actu ator and shaft to th e DVD pickup unit.
(See Fig.10)
(2) Engage the section i of the DVD pickup unit to the shaft of
the DVD traverse mechanism assembly first, and set the
both ends of the shaft of the DVD pickup unit in the sections
g and h of the DVD traverse mechanism assembly. (See
Fig.11)
(3) Slide the DVD pickup unit all the way in the direction of the
arrow. (See Fig.12)
(4) Mesh the lead screw to the section j of DVD pickup unit and
then set the end of the lead screw to the section k. (See
Fig.12)
(5) Attach the torsion spring. (See Fig.8)
(6) Attach the plate. (See Fig.8)
E
Plate
Torsion spring
DVD pickup unit
SW. actuator
Section i
Shaft
F
DVD pickup uni
Shaft
Fig.10
DVD pickup unit
Section h
DVD traverse mechanism assembly
Fig.8
Section g
DVD pickup unit
DVD traverse mechanism assembly
Fig.11
Section k
Section j
Lead scre
Fig.12
(No.MB055)1-15
Page 16
3.3.10 Removing the spindle motor board
r
(See Figs.13 and 14)
• Prior to performing the following procedures, remove the DVD
servo board, clamper base and DVD traverse mechanism assembly.
(1) From the top side of the DVD traverse mechanism assem-
bly, remove the feed motor wire that is soldered to the spindle motor board. (See Fig.13)
(2) From the bottom side of the DVD traverse mechanism as-
sembly, remove the three screws G attaching the spindle
motor board. (See Fig.14)
Spindle motor board
Remove the solders.
Feed moto
wire
DVD traverse mechanism assembly
Fig.13
G
DVD traverse mechanism assembly
Fig.14
G
1-16 (No.MB055)
Page 17
3.3.11 Removing the feed motor
r
(See Figs.15 to 17)
• Prior to performing the following procedures, remove the DVD
servo board, clamper base and DVD traverse mechanism assembly.
(1) From the top side of the DVD traverse mechanism assem-
bly, remove the feed motor wire that is soldered to the spindle motor board. (See Fig.15)
(2) Remove the screw H attaching the feed holder assembly
and then take out the feed holder assembly. (See Fig.15)
(3) Remove the screw J attaching the thrust spring. (See
Fig.16)
(4) Remove the feed gear and lead screw in the direction of the
arrow. (See Fig.16)
(5) Remove the two screws K attaching the feed moto r. (See
Fig.17)
Spindle motor board
DVD traverse mechanism assembly
Fig.15
Feed holder assembly
Remove the solders.
Feed holde
assembly
H
Feed motor
wire
Feed motor
H
Lead screw
Feed motor
Feed gear
Thrust spring
J
Fig.16
Feed holder assembly
K
Fig.17
(No.MB055)1-17
Page 18
3.4 Speaker section
A
3.4.1 Removing the amplifier assembly
(See Figs.1 and 2)
(1) From the rear side of the sp eaker main b ody, remo ve four
screws A attaching the heat sink cover. (See Fig.1)
(2) Remove the nine screws B attaching amplifier assembly.
(See Fig.2)
(3) Move the amplifier assembly backward and disconnect the
wire from connector CN402
assembly. (See Fig.2)
in the lower part of the amplifier
A
Amplifier
assembly
Heat sink
cover
A
Fig.1
mplifier
assembly
B
B
1-18 (No.MB055)
CN402
B
Fig.2
Page 19
3.4.2 Removing the rear panel
(See Fig.3)
• Prior to performing the following procedures, remove the am-
plifier assembly.
(1) Remove the four screws C, twelve screws D and screw E
attaching the rear panel.
(2) Take out the rear panel from the amplifier assembly.
D
E
Rear panel
C
D
D
3.4.3 Removing the SP terminal board
(See Figs.4 and 5)
• Prior to performing the following procedures, remove the am-
plifier assembly and rear panel.
(1) From the top side of the amplifier assembly, disconnect the
card wires from the connectors CN101
mother board. (See Figs.4 and 5)
(2) Disconnect the connectors CN401
the SP terminal board from the connectors CN501, CN503
and CN504 on the mother board while lifting the SP terminal board upward. (See Fig.5)
(3) Take out the SP terminal board from the amplifier assem-
bly.
Reference:
When attaching the SP terminal board, insert the SP terminal
board in the section a of the barrier.
and CN102 on the
, CN403 and CN404 on
C
D
C
Mother
board
SP terminal
board
CN101
CN102
Tie band
Section a
C
D
Fig.3
Amplifier
assembly
CN101
CN102
Tie band
Fig.4
CN401
CN403
CN404
Fig.5
Amplifier
assembly
CN501
CN503
CN504
Mother
board
SP terminal
board
(No.MB055)1-19
Page 20
3.4.4 Removing the mother board assembly
(See Fig.6)
• Prior to performing the followin g procedures, remove the am-
plifier assembly, rear panel and SP terminal board.
(1) From the top side of the amplifier assembly, disconnect the
card wires from the connectors CN151
board.
(2) From the top side of the amplifier assembly, remove the
five screws F attaching the mother board.
(3) Take out the mother board assembly from the amplifier as-
sembly.
3.4.5 Removing the mother board
(See Fig.7)
• Prior to performing the followin g procedures, remove the am-
plifier assembly, rear panel, SP terminal board and mother
board assembly.
(1) From the bottom side of the mother board, remove the two
screws G and two screws H attaching the mother board.
(2) Disconnect the connectors CN521
CN532 on the mother board while lifting the mother board
upward, and take out the mother board.
on the mother
, CN522, CN531 and
Mother
board
F
CN151
CN522
G
Fig.6
H
F
Amplifier
assembly
Mother board
CN531
CN521
G
CN532
H
Fig.7
1-20 (No.MB055)
Page 21
3.4.6 Removing the power amplifier board (A)
(See Figs.8 and 9)
• Prior to performing the following procedures, remove the am-
plifier assembly, rear panel, SP terminal board, mother board
assembly and mother board.
(1) Remove the three screws J attaching the heat sink to the
power amplifier board (A). (See Fig.8)
(2) From the bottom side of the power amplifier board (A), dis-
engage the four sections b of the engagement. (See Fig.9)
(3) From the top side of the power ampli fier board (A), disen-
gage the section c of the engagement to the direction of the
arrow. (See Fig.9)
(4) Remove the power amplifier board (A) from the P.TR hold-
er (A).
3.4.7 Removing the power amplifier board (B)
(See Figs.8 and 10)
• Prior to performing the following procedures, remove the am-
plifier assembly, rear panel, SP terminal board, mother board
assembly and mother board.
(1) Remove the three screws K attaching the heat sink to the
power amplifier board (B). (See Fig.8)
(2) From the bottom side of the power amplifier board (B), dis-
engage the four sections c of the engagement. (See Fig.9)
(3) From the top side of the power ampli fier board (B), disen-
gage the section d of the engagement to the direction of the
arrow. (See Fig.9)
(4) Remove the power amplifier board (B) from the P.TR hold-
er (B).
J
Power
amplifier
board (A)
1
2
(Bottom side)
P.TR holder (A)
P.TR holder (B)
Fig.8
Sections b
CN251
K
Power
amplifier
board (B)
K
Heat sink
P.TR holder (A)
Power amplifier
board (A)
2
1
(Bottom side)
Section e
CN252
Sections b
Fig.9
Sections d
CN351
CN352
Section c
1
2
(Bottom side)
Power amplifier
board (B)
2
1
P.TR holder (B)
(Bottom side)
Sections d
Fig.10
(No.MB055)1-21
Page 22
3.4.8 Removing the power transformer
r
A
L
(See Fig.11)
• Prior to performing the followin g procedures, remove the am-
plifier assembly, rear panel, SP terminal board and mother
board assembly.
(1) Remove the tie band, and remove the four screws L attach-
ing the power transformer.
(2) Take out the power transfo rmer from the amplifier assem-
bly.
3.4.9 Removing the speaker net
(See Figs.12 and 13)
(1) Insert the tip of a flat-bladed screwdriver or similar tool into
the space between the speaker main body and speaker
net, and lift the speaker net little by little to remove. (See
Figs.12 and 13)
Note:
To prevent damaging the speaker net and speaker main
body, insert cushioning plates etc. to the section f and
below the tip of the flat-bladed screwdriver or similar tool.
(2) Take out the speaker net from the speaker main bod y.
L
Power
transforme
Tie band
C bracket
L
Fig.11
1-22 (No.MB055)
Speaker net
Section f
Speaker net
Speaker main body
Section f
Fig.12
Chshioning
blate,etc.
Fig.13
Speaker main body
Flat-bladed
screwdriver,etc.
Page 23
3.4.10 Removing the speaker
(See Figs.14 and 15)
(1) From right side of the speaker main body, remove the eight
screws M attaching the speaker. (See Fig.14)
(2) Take out the speaker from the speaker main body. (See
Fig.15)
(3) Disconnect the wires from the terminal of the speaker. (See
Fig.15)
M
Speaker
Speaker main body
M
Fig.14
Speaker main body
Terminal
Fig.15
Speaker
(No.MB055)1-23
Page 24
SECTION 4
ADJUSTMENT
4.1 TEST mode (See Fig.1)
(1) This model is provided with a test mode for use in production QC, service and repair.
(2) Before executing the test mode, if a tray is not completely close up, make power to standby from on to close up the tray.
(3) After confirm that a tray is completely close up, pull off the power plug.
(4) Insert the power plug to the outlet while pressing the "STOP" and "OPEN/CL OSE" bu ttons on the main unit at the same time.
(5) The opening screen showing th e version number is displayed.
(6) The test mode includes the following four different states, which are switched over every time the "CHOICE" button on the remote
control unit is pressed.
(7) The test mode is exited when the power is switched on or off.
The FL display shows "TEST ". : Area code
STOP button
STANDBY/ON button
CHOICE button
FL display
Fig.1
NOTE:
(1) Press the "CHOICE" button once: Firmware version display m ode / Th e FL d isplay sho ws th e version numbers of th e mi cro-
computers in use.
Displayed information: [System firm] [Front-end (FE) firm] [Back-end (BE) firm]
(2) Press the "CHOICE" button twice: Indicator check mode / All FL and LED segments light up.
(3) Press the "CHOICE" button th ree times: Mechanism check mode / The FL display shows "CHECK".
(4) Press the "CHOICE" button four times: Front-end check mode / The FL display shows "EXPERT".
OPEN/CLOSE button
1-24 (No.MB055)
Page 25
SECTION 5
TROUBLESHOOTING
This service manual does not describe TROUBLESHOOTING.
(No.MB055)1-25
Page 26
VICTOR COMPANY OF JAPAN, LIMITED
AV & MULTIMEDIA COMPANY AUDIO/VIDEO SYSTEMS CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan
(No.MB055)
Printed in Japan
WPC
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