JVC TH-S77 User manual

SERVICE MANUAL
COPYRIGHT © 2005 Victor Company of Japan, Limited No.MB421
2005/7
DVD DIGITAL CINEMA SYSTEM
MB42120057
TH-S77
Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25
PHONES
MIC 2MIC 1
MIN
MIC LEVEL
MAX
Area suffix
US ------------------------ Singapore
UP ----------------------------- Korea
UT ---------------------------- Taiwan
UX -------------------- Saudi Arabia
UG --- Turkey,South Africa,Egypt
UN ----------------------------- Asean
(SP-THS77F) (SP-THS77F) (SP-THS77S)
(SP-PWS77)
(XV-THS77)
(SP-THS77C)

1-2 (No.MB421)
SPECIFICATION
Center unit (XV-THS77)
*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)
Subwoofer (SP-PWS77)
Audio section Total Harmonic Distortion *1 0.02%
Audio input level AUDIO IN (VCR) 270 mV/47 kΩ
Digital input *2 DIGITAL IN (OPTICAL) -21 dBm to -15 dBm (660 nm E30 nm)
Video section Video System PAL/NTSC
Horizontal Resolution 500 lines
Signal-to-Noise Ratio 64 dB
Video input sensitivity/Impedance (VCR IN) Composite: 1.0 V(p-p)/75 Ω
S-video-Y: 1.0 V(p-p)/75 Ω
S-video-C: For PAL 0.3 V(p-p)/75 Ω
S-video-C: For NTSC 0.286 V(p-p)/75 Ω
Video output level Composite: 1.0 V(p-p)/75 Ω
S-video-Y: 1.0 V(p-p)/75 Ω
S-video-C: For PAL 0.3 V(p-p)/75 Ω
S-video-C: For NTSC 0.286 V(p-p)/75 Ω
Component-Y: 1.0 V(p-p)/75 Ω
Component-PB/PR: 0.7 V(p-p)/75 Ω
Tuner section Tuning Range FM 87.50 MHz to 108.00 MHz
AM (Except for the countries of Middle East) 531 kHz to 1 710 kHz(at 9 kHz intervals)
530 kHz to 1 710 kHz(at 10 kHz intervals)
AM (For the countries of Middle East) 531 kHz to 1 602 kHz(at 9 kHz intervals)
530 kHz to 1 600 kHz(at 10 kHz intervals)
General Power Requirements AC 110 - 240 V , 50/60 Hz
Power Consumption 17 W (at operation)
1.4 W (in standby mode)
Dimensions (W ×H ×D) 435 mm ×55 mm ×304 mm
Mass 2.5 kg
Amplifier section Front 140 W per channel, RMS at 4 Ωat 1 kHz, with 10 % total harmonic distortion.
Center/Surround 130 W per channel, RMS at 4 Ωat 1 kHz, with 10 % total harmonic distortion.
Subwoofer 140 W, RMS at 4 Ωat 100 Hz, with 10 % total harmonic distortion.
Speaker section Speaker unit 16 cm Bass-reflex
Power Handling Capacity 140 W
Impedance 4 Ω
Frequency Range 30 Hz to 200 Hz
General Power Requirements AC 110 V/AC 127 V/AC 220 - 240 V, 50 Hz/60 Hz
Power Consumption 135 W (at operation)
0 W (in standby mode)
Dimensions (W ×H ×D) 170 mm ×411 mm ×451 mm
Mass 11.5 kg

(No.MB421)1-3
Satellite Speakers
Designs & specifications are subject to change without notice.
Front speakers
(SP-THS77F)
Speaker unit 5.5 cm ×2
1-way 2-speaker bass-reflex type, Magnetically Shielded
Power Handling Capacity 140 W
Impedance 4 Ω
Frequency Range 90 Hz to 20 kHz
Sound Pressure Level 78 dB/W·m
Dimensions (W ×H ×D) 230 mm ×1 104 mm ×285 mm
Mass 3.6 kg
Center speaker
(SP-THS77C)
Speaker unit 5.5 cm ×2
1-way 2-speaker bass-reflex type, Magnetically Shielded
Power Handling Capacity 140 W
Impedance 4 Ω
Frequency Range 90 Hz to 20 kHz
Sound Pressure Level 80 dB/W·m
Dimensions (W ×H ×D) 220 mm ×84 mm ×91 mm
Mass 0.96 kg
Surround speakers
(SP-THS77S)
Speaker unit 5.5 cm ×2
1-way 2-speaker bass-reflex type
Power Handling Capacity 140 W
Impedance 4 Ω
Frequency Range 90 Hz to 20 kHz
Sound Pressure Level 75.5 dB/W·m
Dimensions (W ×H ×D) 230 mm ×1 104 mm ×285 mm
Mass 3.5 kg

1-4 (No.MB421)
SECTION 1
PRECAUTION
1.1 Safety Precautions
(1) This design of this product contains special hardware and
many circuits and components specially for safety purpos-
es. For continued protection, no changes should be made
to the original design unless authorized in writing by the
manufacturer. Replacement parts must be identical to
those used in the original circuits. Services should be per-
formed by qualified personnel only.
(2) Alterations of the design or circuitry of the product should
not be made. Any design alterations of the product should
not be made. Any design alterations or additions will void
the manufacturers warranty and will further relieve the
manufacture of responsibility for personal injury or property
damage resulting therefrom.
(3) Many electrical and mechanical parts in the products have
special safety-related characteristics. These characteris-
tics are often not evident from visual inspection nor can the
protection afforded by them necessarily be obtained by us-
ing replacement components rated for higher voltage, watt-
age, etc. Replacement parts which have these special
safety characteristics are identified in the Parts List of Ser-
vice Manual. Electrical components having such features
are identified by shading on the schematics and by ( ) on
the Parts List in the Service Manual. The use of a substitute
replacement which does not have the same safety charac-
teristics as the recommended replacement parts shown in
the Parts List of Service Manual may create shock, fire, or
other hazards.
(4) The leads in the products are routed and dressed with ties,
clamps, tubings, barriers and the like to be separated from
live parts, high temperature parts, moving parts and/or
sharp edges for the prevention of electric shock and fire
hazard. When service is required, the original lead routing
and dress should be observed, and it should be confirmed
that they have been returned to normal, after reassem-
bling.
(5) Leakage shock hazard testing
After reassembling the product, always perform an isola-
tion check on the exposed metal parts of the product (an-
tenna terminals, knobs, metal cabinet, screw heads,
headphone jack, control shafts, etc.) to be sure the product
is safe to operate without danger of electrical shock.Do not
use a line isolation transformer during this check.
• Plug the AC line cord directly into the AC outlet. Using a
"Leakage Current Tester", measure the leakage current
from each exposed metal parts of the cabinet, particular-
ly any exposed metal part having a return path to the
chassis, to a known good earth ground. Any leakage cur-
rent must not exceed 0.5mA AC (r.m.s.).
• Alternate check method
Plug the AC line cord directly into the AC outlet. Use an
AC voltmeter having, 1,000Ωper volt or more sensitivity
in the following manner. Connect a 1,500Ω10W resistor
paralleled by a 0.15µF AC-type capacitor between an ex-
posed metal part and a known good earth ground.
Measure the AC voltage across the resistor with the AC
voltmeter.
Move the resistor connection to each exposed metal
part, particularly any exposed metal part having a return
path to the chassis, and measure the AC voltage across
the resistor. Now, reverse the plug in the AC outlet and
repeat each measurement. Voltage measured any must
not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5
mA AC (r.m.s.).
1.2 Warning
(1) This equipment has been designed and manufactured to
meet international safety standards.
(2) It is the legal responsibility of the repairer to ensure that
these safety standards are maintained.
(3) Repairs must be made in accordance with the relevant
safety standards.
(4) It is essential that safety critical components are replaced
by approved parts.
(5) If mains voltage selector is provided, check setting for local
voltage.
1.3 Caution
Burrs formed during molding may be left over on some parts
of the chassis.
Therefore, pay attention to such burrs in the case of pre-
forming repair of this system.
1.4 Critical parts for safety
In regard with component parts appearing on the silk-screen
printed side (parts side) of the PWB diagrams, the parts that are
printed over with black such as the resistor ( ), diode ( )
and ICP ( ) or identified by the " " mark nearby are critical
for safety. When replacing them, be sure to use the parts of the
same type and rating as specified by the manufacturer.
(This regulation dose not Except the J and C version)
Good earth ground
Place this
probe on
each exposed
metal part.
AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)
1500 10W
0.15 F AC TYPE

(No.MB421)1-5
1.5 Preventing static electricity
Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser
diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.
1.5.1 Grounding to prevent damage by static electricity
Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as laser products.
Be careful to use proper grounding in the area where repairs are being performed.
(1) Ground the workbench
Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the
traverse unit (optical pickup) on it.
(2) Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
(3) Handling the optical pickup
• In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical
pickup are shorted. After replacement, return the shorted parts to their original condition.
(Refer to the text.)
• Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power source can easily
destroy the laser diode.
1.6 Handling the traverse unit (optical pickup)
(1) Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.
(2) Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific details, refer to the
replacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long a
time when attaching it to the connector.
(3) Handle the flexible cable carefully as it may break when subjected to strong force.
(4) I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.
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
Short land section
Card wire
Traverse mechanism assembly
pickup

1-6 (No.MB421)
1.8 Important for laser products
1.CLASS 1 LASER PRODUCT
2.DANGER : Invisible laser radiation when open and inter
lock failed or defeated. Avoid direct exposure to beam.
3.CAUTION : There are no serviceable parts inside the
Laser Unit. Do not disassemble the Laser Unit. Replace
the complete Laser Unit if it malfunctions.
4.CAUTION : The CD,MD and DVD player uses invisible
laser radiation and is equipped with safety switches which
prevent emission of radiation when the drawer is open and
the safety interlocks have failed or are defeated. It is
dangerous to defeat the safety switches.
5.CAUTION : If safety switches malfunction, the laser is able
to function.
6.CAUTION : Use of controls, adjustments or performance of
procedures other than those specified here in may result in
hazardous radiation exposure.
REPRODUCTION AND POSITION OF LABELS
CAUTION : Visible and Invisible
laser radiation when open and
interlock failed or defeated.
AVOID DIRECT EXPOSURE TO
BEAM. (e)
VARNING : Synlig och
osynling laserstrålning när
den öppnas och spärren är
urkopplad. Betrakta ej
strålen. (s)
VARO : Avattaessa ja suojalukitus
ohitettuna tai viallisena olet alttiina
näkyvälle ja näkymättömälle
lasersäteilylle. Vältä säteen
kohdistumista suoraan itseesi. (f)
ADVARSEL : Synlig og usynlig
laserstråling når maskinen er
åben eller interlocken fejeler.
Undgå direkte eksponering til
stråling. (d)
!
Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.
CLASS 1
LASER PRODUCT
CAUTION : Visible and Invisible
laser radiation when open and
interlock failed or defeated.
AVOID DIRECT EXPOSURE TO
BEAM. (e)
VARNING : Synlig och
osynling laserstrålning när
den öppnas och spärren är
urkopplad. Betrakta ej
strålen. (s)
VARO : Avattaessa ja suojalukitus
ohitettuna tai viallisena olet alttiina
näkyvälle ja näkymättömälle
lasersäteilylle. Vältä säteen
kohdistumista suoraan itseesi. (f)
ADVARSEL : Synlig og usynlig
laserstråling når maskinen er
åben eller interlocken fejeler.
Undgå direkte eksponering til
stråling. (d)
WARNING LABEL

(No.MB421)1-7
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

1-8 (No.MB421)
SECTION 3
DISASSEMBLY
3.1 Main body section
3.1.1 Removing the metal cover
(See Figs.1 to 3)
(1) From the both sides of the main body, remove the four
screws Aattaching the metal cover. (See Figs.1 and 2)
(2) From the back side of the main body, remove the five
screws Battaching the metal cover. (See Fig.3)
(3) Lift the rear section of the metal cover upward while ex-
tending the lower sections of the metal cover. (See Fig.3)
Fig.1
Fig.2
Fig.3
AMetal cove
r
A
Metal cover
Metal cover
B

(No.MB421)1-9
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 top side of the main body, disconnect the parallel
wires from the connector CN420 on the main board. (See
Fig.4)
(2) Disconnect the parallel wires from the connectors CN451,
CN452 and CN460 on the main board. (See Fig.4)
(3) Remove the screw Cattaching the earth wire to the main
board. (See Fig.4)
(4) Remove the earth wire attaching to the chassis base. (See
Fig.4)
Reference:
When attaching the screw C, attach the earth wire with
it. (See Fig.4)
(5) From the bottom side of the main body, remove the three
screws Dattaching the front panel assembly. (See Fig.5)
(6) Remove the front panel assembly in the direction of the ar-
row while releasing the two joints aand two joints b. (See
Fig.5 to 7)
Fig.4
Fig.5
Fig.6
Fig.7
C
CN452CN460
Earth wire Front panel assembly
CN451
CN420
Main board
D
Front panel assembly
Joint a
Front panel assembly
Joint b
Front panel assembly
Joint b

1-10 (No.MB421)
3.1.3 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 E
and nine screws Fattaching the rear panel.
Fig.8
3.1.4 Removing the audio signal input/output board
(See Figs.9 and 10)
• Prior to performing the following procedures, remove the metal
cover.
(1) From the back side of the main body, remove the screw E,
two screws Gattaching the audio signal input/output board
to the rear panel. (See Fig.9)
(2) Take out the audio signal input/output board, and discon-
nect the card wires from the connectors CN411 and CN412
on the main board. (See Fig.10)
3.1.5 Removing the tuner assembly
(See Figs.9 and 11)
• Prior to performing the following procedures, remove the metal
cover and audio signal input/output board.
(1) From the back side of the main body, remove the two
screws Hattaching the tuner assembly to the rear panel.
(See Fig.9)
(2) From the top side of the main body, disconnect the card
wire from the connector CN410 on the main board. (See
Fig.11)
(3) Take out the tuner assembly from the main body.
3.1.6 Removing the DVD mechanism assembly
(See Fig.11)
• Prior to performing the following procedures, remove metal
cover and audio signal input/output board.
(1) From the top side of the main body, disconnect the card
wires from the connectors CN401, CN402 and CN408 on
the main board.
(2) Remove the screw Jattaching the DVD mechanism as-
sembly on the main body.
Fig.9
Fig.10
Fig.11
E
F
Rear panel
E
G
H
Rear panel
CN412CN411
Audio signal input/output board
Main board
J
CN401
CN408
CN410
Tuner assembly
CN402
DVD mechanism assembly
Main board

(No.MB421)1-11
3.1.7 Removing the power board
(See Figs.12 and 13)
• Prior to performing the following procedures, remove the metal
cover.
(1) From the back side of the main body, remove the screw K
attaching the power board to the rear panel. (See Fig.12)
(2) From the top side of the main body, disconnect the parallel
wires from the connectors CN404 to CN407 on the main
board. (See Fig.13)
(3) Remove the two screws Mattaching the power board. (See
Fig.13)
(4) Release the holder using a pliers and take out the trans-
former board from the main body.
Reference:
Remove the rear panel as required. (See "3.1.3 Removing the
rear panel")
Fig.12
Fig.13
3.1.8 Removing the main board
(See Fig.14)
• Prior to performing the following procedures, remove the metal
cover, rear panel, audio signal input/output board and tuner as-
sembly.
(1) From the top side of the main body, disconnect the card
wires from the connectors CN401, CN402, CN408, CN451,
CN452 and CN460 on the main board.
(2) Disconnect the parallel wires from the connectors CN404
to CN407 and CN420 on the main board.
(3) From the top side of the main body, remove the two screws
N, screw N' attaching the main board on the main body.
(4) Take out the main board from the main body.
Reference:
When attaching the screw N', attach the earth wire with it. (See
Fig.14)
Fig.14
KRear panel
CN404 CN406
CN405 CN407
Main board
Power board
M
N
N
CN404
CN451
CN460
CN406
CN405CN407
CN420
CN402
CN401
CN452
Main board
N'
CN408

1-12 (No.MB421)
3.2 Front panel assembly section
• Prior to performing the following procedures, remove the metal cover and front panel assembly.
3.2.1 Removing the HP board
(See Fig.1)
(1) From the inside of the front panel assembly, remove the
two screws Aattaching the HP board.
(2) Take out the HP board from the front panel assembly.
3.2.2 Removing the KEY and LED board
(See Fig.1 and 2)
• 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 Battaching the KEY board.(See Fig.1)
(2) Take out the KEY and LED board from the front panel as-
sembly. (See Fig.1)
Reference:
When attaching the KEY and LED board, make sure parallel
wire in the KEY board slot.
(See Fig.1)
When attaching the LED board, slot in the LED board into claw
of front panel assembly and push to the arrow direction. (See
Fig. 2)
Fig.1
Fig.2
3.2.3 Removing the FL board
(See Fig.3)
• 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 Cattaching the FL board.
(2) Take out the FL board from the front panel assembly.
3.2.4 Removing the MIC board
(See Fig.3 and 4)
• Prior to performing the following procedures, remove the metal
cover , front panel assembly , KEY board and LED board.
(1) From the front side of the front panel assembly, pull out the
volume knob in the direction of the arrow. (See Fig. 4)
(2) From the inside of the front panel assembly, remove the
two screws Dattaching the MIC board. (See Fig. 3)
(3) Take out the MIC board from the front panel assembly.
(See Fig. 3)
Fig.3
Fig.4
B
HP board
Slot
KEY board LED board
A
Parallel wire
LED board
Claw
Claw
D
FL board MIC board
C
Volume knob
Front panel assembly

(No.MB421)1-13
3.3 DVD mechanism section
• Remove the DVD mechanism assembly from the main body.
3.3.1 Removing the traverse mechanism assembly
(See Fig.1)
From the bottom side of the DVD mechanism assembly, remove
the four screws Aattaching the traverse mechanism assembly
and take out the traverse mechanism assembly with the DVD
module board.
Fig.1
AA
DVD module board
Traverse mechanism assembly
DVD mechanism assembly

1-14 (No.MB421)
3.3.2 Removing the DVD module board
(See Figs.2 and 3)
• Remove the traverse mechanism assembly.
(1) From the side of the traverse mechanism assembly, solder
the short land sections aon the DVD pickup. (See Fig.2.)
(2) From the bottom side of the traverse mechanism assem-
bly, release the lock of the connector CN101 on the DVD
module board in the direction of the arrow and disconnect
the card wire. (See Fig.3.)
Caution:
• Solder the short land sections aon the DVD pickup be-
fore disconnecting the card wire from the connector
CN101 on the DVD module board. If the card wire is
disconnected without attaching solder, the DVD pick-
up may be destroyed by static electricity. (See Figs.2
and 3.)
• When attaching the DVD module board, be sure to re-
move solders from the short land sections aafter con-
necting the card wire to the connector CN101 on the
DVD module board. (See Figs.2 and 3.)
(3) Disconnect the card wire from the connector CN201 on the
DVD module board. (See Fig.3.)
(4) Remove the two screws Battaching the DVD module
board. (See Fig.3.)
(5) Remove the DVD module board from the engagement sec-
tion bin an upward and remove the engagement section c
in the direction of the arrow. (See Fig.3.)
Fig.2
Fig.3
Traverse mechanism assembly
DVD pickup
a
Card wire
CN101 CN201
Card wire
b
c
B
B
DVD module board
Traverse mechanism assembly

(No.MB421)1-15
3.3.3 Removing the DVD pickup
(See Figs.2,4 to 6)
• Remove the traverse mechanism assembly.
(1) From the side of the traverse mechanism assembly, solder
the short land sections aon the DVD pickup. (See Fig.2.)
(2) Release the lock of the connector on the DVD pickup in the
direction of the arrow and disconnect the card wire. (See
Fig.4.)
Caution:
• Solder the short land sections aon the DVD pickup be-
fore disconnecting the card wire from the connector on
the DVD pickup. If the card wire is disconnected with-
out attaching solder, the DVD pickup may be de-
stroyed by static electricity. (See Figs.2 and 4.)
• When attaching the DVD pickup, be sure to remove
solders from the short land sections aafter connecting
the card wire to the connector on the DVD pickup.
(See Figs.2 and 4.)
(3) Remove the screw Cand remove the feed bracket from the
sections d. (See Fig.4.)
(4) Release the claw eof the thrust spring in the direction of
the arrow and remove the thrust spring. (See Fig.4.)
(5) Remove the guide shaft of the DVD pickup from the section
fon the traverse mechanism assembly and remove the
guide shaft from the section gwhile moving it in the direc-
tion of the arrow. (See Fig.5.)
(6) Remove the DVD pickup from the section hof the traverse
mechanism assembly and take out the DVD pickup with
the guide shaft. (See fig.5.)
(7) From the bottom side of the DVD pickup, remove the two
screws Dattaching the rack arm and rack arm spring. (See
Fig.6.)
(8) Pull the guide shaft out of the DVD pickup. (See Fig.6.)
Fig.4
Fig.5
Fig.6
Thrust spring
e
Thrust spring
DVD pickup
Connector
Feed bracket
Card wire
C
Traverse mechanism assembly
DVD pickup
Guide shaft
f
g
h
Torsion spring
DVD pickup
Rack arm
Rack arm spring
D
Guide shaft

1-16 (No.MB421)
3.3.4 Attaching the DVD pickup
(See Figs.2,4 to 7)
• See "3.2.3 Removing the DVD pickup".
(1) Attach the guide shaft, rack arm and rack arm spring to the
DVD pickup. (See Fig.6.)
(2) Align the DVD pickup to the section hof the traverse mech-
anism assembly first, and set the both ends of the guide
shaft of the DVD pickup in the sections fand gof the
traverse mechanism assembly. (See Fig.5.)
Reference:
When attaching the guide shaft to the section g, attach it
under the rod spring. (See Fig.5.)
(3) Attach the feed bracket and thrust spring. (See Fig.4.)
(4) Remove solders from the short land sections aafter con-
necting the card wire to the connector on the DVD pickup.
(See Figs.2 and 4.)
(5) Turn the screw shaft gear in the direction of the arrow 1 to
move the DVD pickup fully in the direction of the arrow 2.
(See Fig.7.) Fig.7
1
22
Screw shaft gear
DVD pickup

(No.MB421)1-17
3.3.5 Removing the feed motor
(See Figs.4,8 and 9)
• Remove the traverse mechanism assembly.
(1) From the top side of the traverse mechanism assembly, re-
move the screw Cand remove the feed bracket from the
sections d. (See Fig.4.)
(2) Release the claw eof the thrust spring in the direction of
the arrow and remove the thrust spring. (See Fig.4.)
(3) Remove the wires from the soldered section jon the spin-
dle motor board. (See Fig.8.)
Reference:
• When attaching the feed motor, pass the wire through
the section kon the traverse mechanism assembly.
(See Fig.8.)
• Pass the wire through the lower section of the rod
spring. (See Fig.8.)
(4) Remove the screw shaft in the direction of the arrow. (See
Fig.8.)
(5) From the side of the traverse mechanism assembly, re-
move the screw Eattaching the feed motor. (See Fig.8.)
(6) Take out the feed motor from the traverse mechanism as-
sembly.
3.3.6 Removing the spindle motor board
(See Figs.8 and 9)
• Remove the traverse mechanism assembly and DVD module
board.
(1) From the top side of the traverse mechanism assembly, re-
move the wires from the soldered section jon the spindle
motor board. (See Fig.8.)
(2) From the bottom side of the traverse mechanism assem-
bly, remove the three screws Fattaching the spindle motor
board. (See Fig.9.)
Reference:
• When attaching the spindle motor board, pass the wire
through the section mon the traverse mechanism assembly.
(See Fig.9.)
• After attaching the screws F, apply bond as before.
Fig.8
Fig.9
Spindle motor board
Screw shaft Wires
k
j
Traverse mechanism assembly
Rod spring
E
Traverse mechanism assembly
F
m
F
Spindle motor
board

1-18 (No.MB421)
3.3.7 Removing the DVD loading switch board
(See Fig.10.)
(1) From the bottom side of the DVD mechanism assembly, re-
move the wires from the soldered sections non the DVD
loading switch board.
(2) Remove the screw Gattaching the DVD loading switch
board.
(3) Lift the DVD loading switch board while pressing the claw
pof the DVD mechanism assembly in the direction of the
arrow and remove it from the section q.
Reference:
Pass the wires through the section rafter attaching the DVD
loading switch board to the DVD mechanism assembly.
3.3.8 Removing the loading motor
(See Figs.10 to 14)
(1) From the bottom side of the DVD mechanism assembly, re-
move the wires from the soldered section non the DVD
loading switch board. (See Fig.10.)
(2) Remove the screw Hattaching the tray assembly. (See
Fig.10.)
(3) From the right side of the DVD mechanism assembly, push
the slide cam and pull the tray assembly out of the DVD
mechanism assembly in the direction of the arrow. (See
Fig.11.)
(4) From the top side of the DVD mechanism assembly, re-
move the two screws Jattaching the clamper base. (See
Fig.12.)
(5) Lift the clamper base in an upward direction to remove it
from the engagement sections sand remove the engage-
ment sections tin the direction of the arrow. (See Fig.12.)
(6) Remove the two screws Kattaching the tray assembly and
take out the tray assembly from the DVD mechanism as-
sembly. (See Fig.13.)
(7) Remove the belt from the motor pulley. (See Fig.14.)
Note:
Take care not to attach grease on the belt.
(8) Remove the two screws Mattaching the loading motor to
the DVD mechanism assembly and take out the loading
motor from the bottom side of the DVD mechanism assem-
bly. (See Fig.14.)
Reference:
Pass the wires through the section rafter attaching the loading
motor to the DVD mechanism assembly. (See Fig.10.)
Fig.10
Fig.11
Fig.12
DVD loading switch board
Wires
n
p
r
DVD mechanism assembly
G
Tray assembly H
q
DVD mechanism assembly
Tray assembly
Slide cam
J
J
Clamper base
DVD mechanism assembly
s
s
t
t

(No.MB421)1-19
Fig.13
Fig.14
Tray assembly
DVD mechanism assembly
K
DVD mechanism assembly
M
Belt
Motor pulley

1-20 (No.MB421)
SECTION 4
ADJUSTMENT
4.1 Special mode
4.1.1 Outline
The contents in the special mode of operation, and the definition of a key (remote controller or main unit)
4.1.2 Special mode
Insert the power cord in an outlet while
pressing the
"POWER" and "PLAY" keys
on the main unit simultaneously.
A main unit entered in the
DVD TEST MODE.
Press the 1.5 second "F.SKIP" key on the remote
controller during the DVD test mode.
DVD initialization is completed
Press the "MENU" key on the remote
controller during the DVD test mode.
A region No. display
Press the "PAUSE" key on the remote
controller during the DVD test mode.
DVD initialization is completed
2.DVD NORMAL INITIALIZE
1.DVD TEST MODE
3.DVD FULL INITIALIZE
4.DVD REGION CHECK
It goes into the TEST mode of DVD.
DVD TEST mode is canceled by except DVD source, and POWER OFF.
It is referring to the "4.2 DVD test mode" for details.
Initialize DVD backend memory.
<RDS> segment of FL will light up if successful.
It is referring to the "4.2 DVD test mode" for details.
Initialize DVD memory including frontend.
<RDS> segment of FL will light up if successful.
It is referring to the "4.2 DVD test mode" for details.
FL display in DVD TEST MODE.
It is referring to the "4.2 DVD test mode" for details.