JVC TH-V70R Service Manual
21175200302
TH-V70R
SERVICE MANUAL
DVD DIGITAL CINEMA SYSTEM
TH-V70R
Area suffix
SP-XSV70 SP-XCV70SP-XSV70 SP-XSV70SP-XSV70
DVD DIGITAL CINEMA
SYSTE
M
TH-
V
70
R
SP-PWV70 XV-THV70R
EE --------- Russian Federation
TV AUDIO
DVD
VCR 1
AUX
FM/AM
VCR
DECODE
AUDIO
ANGLE
SUBTITLE
RETURN DIGEST ZOOM VFP
+
TOP MENU MENU ZOOM
SOUND
Ð
CONTROLÐ SUBWOOFER +EFFECT
VCR
123
Ð
CENTER
+
TEST
TV
456
SLEEP
Ð
REAR-L
+
789
SETTING
REAR-R
+
Ð
+10
10
0
TV RETURN
FM MODE
100+
TA/NEWS/INFO
ON
SCREEN
DVD
RDS
PTY PTY
ENTER
SURROUND
CHOICE
MODE
RDS DISPLAY
PTY SEARCH
CHANNEL VOLUMETV VOL
TV/VIDEO MUTING
/REW
FF/
PLAY
TUNING
DOWN UP
PAUSE
STOP
REC
MEMORY
STROBE
DIMMER
RMÐSTHV70R
DVD CINEMA SYSTEM
TABLE OF CONTENTS
1 Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
2 Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3 Adjustment method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25
4 Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD.
No.21175
2003/02
TH-V70R
Important Safety Precautions
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, 1,000 ohms per volt or more sensitivity in
the following manner. Connect a 1,500 ohm 10W resistor
paralleled by a 0.15 µF AC-type capacitor between an
SECTION 1
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.).
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. (Except the JC version)
1-2 (No.21175)
1.5 Safety Precautions (U.K only)
(1) This design of this product contains special hardware and many circuits and components specially for safety purposes. For con-
tinued 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.
(2) Any unauthorised design alterations or additions will void the manufacturer's guarantee; furthermore the manufacturer cannot
accept responsibility for personal injury or property damage resulting therefrom.
(3) Essential safety critical components are identified by ( ) on the Parts List and by shading on the schematics, and must never
be replaced by parts other than those listed in the manual. Please note however that many electrical and mechanical parts in
the product have special safety related characteristics. These characteristics are often not evident from visual inspection. Parts
other than specified by the manufacturer may not have the same safety characteristics as the recommended replacement parts
shown in the Parts List of the Service Manual and 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 re-assembling.
1.5.1 Warning
(1) Service should be performed by qualified personnel only.
(2) This equipment has been designed and manufactured to meet international safety standards.
(3) It is the legal responsibility of the repairer to ensure that these safety standards are maintained.
(4) Repairs must be made in accordance with the relevant safety standards.
(5) It is essential that safety critical components are replaced by approved parts.
(6) If mains voltage selector is provided, check setting for local voltage.
TH-V70R
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.
(No.21175)1-3
TH-V70R
1.6 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.
1.6.1 Grounding to prevent damage by static electricity
Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as 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 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.
1.7 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 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 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.
1.8 Attention when traverse unit is decomposed
*Please refer to "Disassembly method" in the text for the DVD pickup unit.
• Apply solder to the short land sections before the flexible wire is disconnected from the connector CN101 on the DVD servo board.
(If the flexible wire is disconnected without applying solder, the DVD 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 lands
DVD mechanism assembly
1-4 (No.21175)
Flexible wire
Connector
CN202
CN201
DVD servo board
1.9 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 de feated.
It is dangerous to defeat the safety switches.
TH-V70R
(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 anadjustment or operation check.
VARNING
Osynlig laserstrålning är denna del är öppnad och spårren är
urkopplad. Betrakta ej strålen.
VARO
Avattaessa ja suojalukitus ohitettaessa olet alttiina näkymättömälle lasersäteilylle. Älä katso säteeseen.
REPRODUCTION AND POSITION OF LABELS
CLASS 1
LASER PRODUCT
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.
WARNING LABEL
CAUTION: Invisible laser
radiation when open and
interlock failed or defeated.
AVOID DIRECT EXPOSURE
TO BEAM. (e)
ADVARSEL: Usynlig laserstråling ved åbning, når
sikkerhedsafbrydere er ude
af funktion. Undgåudsættelse for stråling. (d)
VARNING: Osynlig laserstrålning när denna del är
öppnad och spärren är
urkopplad. Betrakta ej
strålen. (s)
VARO: Avattaessa ja
suojalukitus ohitettaessa
oleta lttiina näkymättömälle lasersäteilylle.
Älä katso
säteeseen. (f)
CLASS 1
LASER PRODUCT
(No.21175)1-5
TH-V70R
SECTION 2
Disassembly method
2.1 Main body section
2.1.1 Removing the top plate (See Fig. 1.)
From the top side of the main body, remove the four screws A
attaching the top plate.
2.1.2 Removing the bottom panel (See Figs. 2 and 3.)
(1) From the rear side of the main body, remove the three
screws B attaching the bottom panel.
(2) From the bottom side of the main body, remove the two
screws C attaching the bottom panel.
(3) Remove the bottom panel in an upward direction.
B
Top plate
AA
Fig.1
Top panel
Bottom panel
Fig.2
2.1.3 Removing the top panel (See Fig. 4.)
• Remove the top plate.
• Remove the bottom panel.
(1) Slide the top panel toward the rear (direction of the arrow)
and disengage it from the engagement sections a and b of
the bottom chassis.
(2) Remove the top panel in an upward direction.
C
Bottom panel
Fig.3
Top panel
bb
1-6 (No.21175)
a
Fig.4
2.1.4 Removing the DVD mechanism assembly (See Figs. 5 and 6.)
• Remove the top plate.
• Remove the bottom panel.
• Remove the top panel.
(1) From the top side of the main body, disengage the claw c
of the DVD mechanism assembly and then remove the
push button.
(2) Remove the five screws D and screw E attaching the DVD
mechanism assembly.
(3) Disconnect the wire from connector CN812 on the LED
board.
(4) Disconnect the connectors CN502 and CN503 on the DVD
servo board from connectors CN801 and CN803 on the
main board while lifting the DVD mechanism assembly in
an upward direction.
LED board
D
TH-V70R
DVD mechanism
assembly
D
CN812
2.1.5 Removing the front panel assembly (See Figs. 7 and 8.)
• Remove the top plate.
• Remove the bottom panel.
• Remove the top panel.
• Remove the DVD mechanism assembly.
(1) Remove the wire clamp bundling the wires of the front pan-
el assembly.
(2) Remove the card wire of the front panel assembly from the
wire holder.
(3) Disconnect the wires from connectors CN106 and CN814
on the main board.
(4) Disconnect the card wires from connectors CN802 and
CN813 on the main board.
(5) From the front side of the main body, remove the two
screws F attaching the front panel assembly.
(6) Disengage the claws d of the front panel assembly from the
bottom chassis and then remove the front panel assembly
in the direction of the arrow.
Reference:
• Before attaching the front panel assembly, pass the
card wire of the front panel assembly through the hole
on the bottom chassis.
• After attaching the front panel assembly, bundle the
wires and card wire of the front panel assembly using
a wire clamp.
Caution:
• In the assembly, arrange the wires and wire clamp so
that they are not touch to the regulator IC(IC953).
CN502
Main board
Wire holder
Bottom
chassis hole
Claws d
Claw c
D
CN803 CN801
Push button
Fig.5
Fig.6
CN814
CN813
CN802
CN106
Fig.7
Card wires
Front panel assembly
F
Fig.8
E
DVD servo board
CN503
Front panel assembly
Main board
Wire clamp
Bottom chassis
Wire
IC953
Claws d
Bottom chassis
(No.21175)1-7
TH-V70R
2.1.6 Removing the DSP/Audio board (See Figs. 9 and 10.)
• Remove the top plate.
• Remove the bottom panel.
• Remove the top panel.
• Remove the DVD mechanism assembly.
(1) From the top side of the main body, remove a screw G at-
taching the DSP/Audio board.
(2) From the rear side of the main body, remove the screw H
and two screws J attaching the DSP/Audio board.
(3) Take out the DSP/Audio board from the bottom chassis
and then disconnect the card wire from connector CN806
on the main board.
Reference:
• Before attaching the DSP/Audio board, connect the
card wire to the connector CN806 on the main board.
2.1.7 Removing the compulink board (See Figs. 9 and 10.)
• Remove the top plate.
• Remove the bottom panel.
• Remove the top panel.
• Remove the DVD mechanism assembly.
(1) Disconnect the card wire from connector CN592 on the
compulink board.
(2) From the rear side of the main body, remove the screw K
attaching the compulink board.
(3) Take out the compulink board from the bottom chassis.
2.1.8 Removing the tuner (See Figs. 9 and 10.)
• Remove the top plate.
• Remove the bottom panel.
• Remove the top panel.
• Remove the DVD mechanism assembly.
(1) Disconnect the card wire from connector CN805 on the
main board.
(2) From the rear side of the main body, remove the two
screws L attaching the tuner.
(3) Take out the tuner from the bottom chassis.
Compulink board
Main board
H
L
CN592
J
Fig.9
K
Rear panel
Fig.10
CN805
CN806
Tuner
DSP/Audio
board
Card wire
G
Card wire
1-8 (No.21175)
TH-V70R
2.1.9 Removing the main board (See Figs. 11 and 12.)
• Remove the top plate.
• Remove the bottom panel.
• Remove the top panel.
• Remove the DVD mechanism assembly.
• Remove the front panel assembly.
• Remove the DSP/Audio board.
(1) Disconnect the card wire from connector CN805 on the
main board.
(2) Remove the wire clamp bundling the fan motor wire and
then disconnect the wire from connector CN972 on the
main board.
(3) Disconnect the card wire from connector CN592 on the
compulink board.
(4) Remove the five screws M and screw M' attaching the main
board.
(5) From the rear side of the main body, remove the four
screws N attaching the main board.
(6) Remove the rear panel with the tuner and compulink board.
(7) Take out the main board from the bottom chassis.
Reference:
Attaching the main board
• When attaching the screw M', attach the wire holder together with it.
• After connecting the wires to the connectors, bundle
them using the wire clamp.
• Insert the DVD mechanism assembly wire into the
notch on the bottom chassis. (See Fig. 11.)
Main board
M
Fan motor wire
Wire clamp
Wire holder
N
Insert this wire into the notch.
M
CN972
M'
Fig.11
Rear panel
Fig.12
Compulink board
CN592
M
Card wire
CN805
N
Tuner
M
2.1.10 Removing the fan motor (See Figs. 13 and 14.)
• Remove the top plate.
• Remove the bottom panel.
• Remove the top panel.
• Remove the DVD mechanism assembly.
(1) Remove the wire clamp and tie band bundling the fan mo-
tor wire.
(2) Disconnect the wire from connector CN972 on the main
board.
(3) From the left side of the main body, remove the two screws
P attaching the fan motor.
Reference:
• After mounting the fan motor, bundle the fan motor
wire using the wire clamp.
Fan motor wire
Wire clamp
CN972
Tie band
Fig.13
Bottom chassis Fan motor Front panel
assembly
Fig.14
P
(No.21175)1-9
TH-V70R
2.2 Front panel assembly section
• Remove the top plate.
• Remove the bottom panel.
• Remove the top panel.
• Remove the DVD mechanism assembly.
• Remove the front panel assembly.
2.2.1 Removing the switch board (See Fig. 15.)
From the back side of the front panel assembly, remove the four
screws Q attaching the switch board.
2.2.2 Removing the open/close board (See Figs. 15 and 16.)
(1) From the back side of the front panel assembly, remove the
two screws R attaching the door motor assembly.
(2) Remove the screw S attaching the open/close board of the
door motor assembly.
2.2.3 Removing the door motor (See Fig. 16.)
• Remove the door motor assembly.
(1) Remove the stop washers attaching the clutch assembly
and gear 2.
(2) Remove the clutch assembly and Gear 2.
(3) Remove the two screws T attaching the door motor.
Door motor assembly
R
Clutch assembly
Stop washer
Gear 2
Front panel assembly
(Back side)
Fig.15
Door motor
Fig.16
Q
Switch board
T
S
Open/close
board
Door motor assembly
1-10 (No.21175)
2.2.4 Removing the front board (See Figs. 17 to 20.)
(1) While widening section e of the front base in the direction
of the arrow, remove the rod gear assembly.
(2) Slide the moving panel assembly all the way in the direction
of the arrow.
(3) While slightly widening sections f toward the front, take out
the moving panel assembly in the direction of the arrow.
(4) Remove the two screws U attaching the moving base of the
moving panel assembly.
(5) Disengage the engagement sections g on the inside of the
moving base and at the inside of the moving panel assem-
bly and remove the moving base.
(6) Remove the two screws V attaching the front board.
(7) Disengage the claws h of the moving panel and remove the
front board.
Reference:
• Before attaching the moving base, pass the card wire
of the front board through the hole on the moving base.
(See Fig.19.)
Front panel assembly
(Back side)
Front base
Rod gear assembly
Fig.17
f
Moving panel assembly
Fig.18
TH-V70R
e
Front base
U
V
Fig.19
h
Fig.20
Hole
Front board
Moving panel
Moving base
gg
Card wire
(No.21175)1-11
TH-V70R
y
2.3 DVD mechanism assembly section
• Remove the top plate.
• Remove the bottom panel.
• Remove the top panel.
• Remove the DVD mechanism assembly.
2.3.1 Removing the LED board (See Fig. 1.)
From the top side of the DVD mechanism assembly, disengage
the claw a of the top chassis attaching the LED board and then
remove the LED board.
2.3.2 Removing the DVD mechanism assembly (See Fig. 2.)
(1) Extend the both sides of the protector, and then raise the
protector in the direction of the arrow.
(2) Remove the three screws A attaching the DVD mechanism
assembly on the top chassis.
Claw a
A
LED board
Top chassis
Fig.1
DVD mechanism assembl
A
Protector
Fig.2
Top chassis
1-12 (No.21175)
2.3.3 Removing the DVD servo board (See Fig. 3.)
Caution:
• Be sure to solder the short land sections b on the flexible
wire before disconnecting the flexible wire from connector
CN101 on the DVD servo board.
If the flexible wire is disconnected without attaching solder,
the pickup unit may be destroyed by static electricity.
(1) From the back side of the DVD mechanism assembly, at-
tach solder to the short land sections b of the flexible wire
that is connected to the connector CN101 of the DVD servo
board.
(2) Disconnect the flexible wire from connector CN101 on the
DVD servo board.
(3) Disconnect the card wires from connectors CN201 and
CN202 on the DVD servo board.
(4) Remove the two screws B attaching the DVD servo board.
(5) While pushing the claw c of the DVD mechanism assembly
in the direction of the arrow, remove the DVD servo board
from the projections d and e in an upward direction.
Caution:
• In the assembly, be sure to remove solder from the
short land sections b after connecting the flexible wire.
Flexible wire
DVD servo board
Short land sections b
DVD mechanism assembly
B
CN202
CN101
CN201
Projection e
B
Fig.3
TH-V70R
Projection d
Claw c
2.3.4 Removing the DVD traverse mechanism assembly (See Fig. 4.)
• Remove the DVD servo board.
(1) Remove the two screws C attaching the DVD traverse
mechanism assembly.
(2) Disengage the claw f attaching the DVD traverse mecha-
nism assembly and then take out the DVD traverse mechanism assembly.
DVD traverse mechanism assembly
C C
Claw f
Fig.4
(No.21175)1-13
TH-V70R
y
w
t
w
2.3.5 Removing the DVD pickup unit (See Figs. 5 to 7.)
• Remove the DVD servo board.
• Remove the DVD traverse mechanism assembly.
(1) From the top side of the DVD traverse mechanism assem-
bly, remove the screw D attaching the bracket.
(2) Remove the claw g attaching the thrust spring and then
take out the torsion spring.
(3) Remove the lead screw from the section h and then re-
move the shaft from the section i.
(4) Disengage the section j of the DVD pickup unit and then re-
move the DVD pickup unit with the shaft.
(5) Pull the shaft out of the DVD pickup unit.
(6) Remove the two screws E attaching the SW. actuator.
SW. actuator
Shaft
E
DVD pickup uni
2.3.6 Attaching the DVD pickup unit (See Figs. 5 to 9.)
Reference:
Refer to the explanation of "Removing the DVD pickup unit" on
the preceding page.
(1) Attach the SW. actuator and shaft to the DVD pickup unit.
(See Fig.7.)
(2) Engage the section j 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
i and i' of the DVD traverse mechanism assembly.
(3) Slide the DVD pickup unit all the way in the direction of the
arrow.
(4) Mesh the lead screw to the section k of DVD pickup unit
and then set the end of the lead screw to the section h.
(5) Attach the thrust spring. (See Fig.6.)
(6) Attach the bracket. (See Fig.5.)
D
Bracket
DVD pickup unit
Shaft
DVD pickup unit
Shaft
Section i'
Fig.7
Fig.8
Section
j
Section i
Section h
Section k
DVD pickup unit
Section j
1-14 (No.21175)
DVD traverse mechanism assembl
Fig.5
Section i
Section h
Lead scre
Claw g
Thrust spring
Fig.6
Lead scre
DVD pickup unit
Fig.9
Shaft
2.3.7 Removing the spindle motor board (See Figs. 10 and 11.)
r
r
• Remove the DVD servo board.
• Remove the 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.
(2) From the back side of the DVD traverse mechanism as-
sembly, remove the three screws F attaching the spindle
motor board.
Spindle motor
board
F
TH-V70R
Remove the solders.
Feed moto
wire
Feed motor
Fig.10
F
Fig.11
Spindle moto
board
(No.21175)1-15
TH-V70R
r
2.3.8 Removing the feed motor (See Figs. 12 to 14.)
• Remove the DVD servo board.
• Remove the DVD traverse mechanism assembly.
(1) Remove the four screws G attaching the traverse mecha-
nism assembly.
(2) Take out the traverse mechanism assembly from the
mechanism base.
(3) Remove the screw D attaching the bracket and take out the
bracket.
(4) Disengage the claw g attaching the thrust spring and take
out the thrust spring.
(5) Pull out the lead screw in the direction of the arrow.
(6) Remove the feed gear M.
(7) Remove the feed motor wire that is soldered to the spindle
motor board.
(8) Remove the two screws H attaching the feed motor and
take out the feed motor.
Traverse
mechanism
assembly
G
Bracket
G G
Fig.12
D
Mechanism
base
Feed moto
Spindle motor board
Thrust spring
Remove the solders.
Feed motor wire
Lead screw
Feed motor
Feed gear M
Claw g
Fig.13
1-16 (No.21175)
Traverse
mechanism assembly
Fig.14
H
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2.3.9 Removing the switch board (See Fig.15.)
• Remove the DVD mechanism assembly.
(1) From the top side of the CD mechanism assembly, remove
the screw J attaching the switch board.
(2) Lift the switch board slightly and then remove the wire from
connector CN101 on the switch board.
2.3.10 Removing the loading motor assembly (See Figs.3,
15 to 17.)
• Remove the DVD mechanism assembly.
(1) From the back side of the DVD mechanism assembly, dis-
connect the card wire from connector CN202 on the DVD
servo board. (See Fig.3.)
(2) From the top side of the CD mechanism assembly, remove
the two screws K attaching the clamper base assembly.
(3) Disconnect the wire from connector CN101 on the switch
board while lifting the clamper base assembly slightly and
remove the clamper base assembly.
(4) Remove the three screws L attaching the roller holder as-
sembly and take out the roller holder assembly.
(5) Disconnect the wires from connectors CN103 and CN104
on the loading motor assembly.
(6) Remove the belt of the loading motor assembly.
(7) Remove the two screws M attaching the loading motor as-
sembly and take out the loading motor assembly.
CD mechanism assembly Clamper base assembl
J
CN101
K K
Switch board
Fig.15
L
Roller holde
assembly
L
Fig.16
CN103
Roller holder
assembly
M
CN104
Loading motor assembl
M
Belt
Fig.17
(No.21175)1-17
TH-V70R
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2.4 Speaker section
2.4.1 Removing the amplifier assembly (See Figs. 1 and 2.)
(1) From the rear side of the speaker main body, remove the
four screws A attaching the heat sink cover and then remove the heat sink cover.
(2) Remove the eight screws B attaching the amplifier assem-
bly.
(3) Move the amplifier assembly backward and disconnect the
wire from connector CN109 in the lower part of the amplifier
assembly.
B
Amplifier assembl
mplifier assembly
A
Heat sink cove
A
Fig.1
2.4.2 Removing the rear panel (See Fig. 3.)
• Remove the amplifier assembly.
(1) Pull out the knob.
(2) Remove the ten screws C, ten screws D and screw E at-
taching the rear panel.
BB
CN109
B
Fig.2
Amplifier assembl
C
C
Knob
CCD
1-18 (No.21175)
E
DD
C
D
D
C
Fig.3
C
D
Rear panel
C
TH-V70R
2.4.3 Removing the pre-amplifier board (See Figs. 4 to 6.)
• Remove the rear panel.
(1) Remove the two screws F attaching the volume bracket.
(2) Disconnect the pre-amplifier board from the connector
CN201 on the mother board and take out the pre-amplifier
board.
(3) Pull out the push button.
(4) Remove the two screws G and nut attaching the volume
bracket.
2.4.4 Removing the power supply & SP terminal board (See
Figs. 4 and 5.)
• Remove the rear panel.
(1) Remove the two screws H attaching the AC bracket.
(2) Disconnect the power supply & SP terminal board from the
connectors CN210 and CN211 on the mother board.
(3) Disconnect the wire from connector CN107 on the power
supply & SP terminal board.
(4) Disconnect the power cord from connector CN108 on the
power supply & SP terminal board.
F
Volume bracket
Pre-amplifier
board
AC bracket
H
Volume bracket
Mother board
H
Fig.4
Power transformer
CN101
Heat sink
CN201
Pre-amplifier board
Power supply & SP
terminal board
Volume bracket
G
Push button
CN107
Nut
G
CN111
CN110
Fig.5
Mother board
CN211
CN210
CN108
Power cord
Pre-amplifier board
CN101
Fig.6
(No.21175)1-19
TH-V70R
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2.4.5 Removing the mother board (See Figs. 7 and 8.)
• Remove the rear panel.
• Remove the pre-amplifier board.
• Remove the power supply & SP terminal board.
(1) Disconnect the wire from the connector CN104 on the
mother board.
(2) Remove the seven screws J attaching the mother board.
(3) Take out the mother board with the power amplifier board
(A,B).
(4) From the bottom side of the mother board, remove the two
screws K and two screws L attaching the power amplifier
board (A,B).
(5) Remove the power amplifier board (A,B) from connectors
CN202, CN203, CN205 and CN206 on the mother board.
J
CN104
CN202
Mother board
J
KL
J
Power amplifier
board (A)
J
Power amplifier
board (B)
J
Power transforme
Mold base
Fig.7
Mother board
CN206
CN203
Power amplifier
board (A)
Power amplifie
board (B)
CN205
K L
Fig.8
1-20 (No.21175)
2.4.6 Removing the power amplifier board (A) (See Figs. 9
and 10.)
• Remove the mother board.
(1) Remove the four screws M attaching the heat sink to the
power amplifier board (A).
(2) From the bottom side of the power amplifier board (A), dis-
engage the four engagement sections a.
(3) From the top side of the power amplifier board (A), slide the
P.TR holder (A) in the direction of the arrow to disengage
the engagement section b and remove the power amplifier
board (A) from the P.TR holder (A).
2.4.7 Removing the power amplifier board (B) (See Figs. 9
and 11.)
• Remove the mother board.
(1) Remove the four screws N attaching the heat sink to the
power amplifier board (B). (See Fig.9.)
(2) From the bottom side of the power amplifier board (B), dis-
engage the four engagement sections c.
(3) arrow to disengage the engagement section d and remove
the power amplifier board (B) from the P.TR holder (B).
P.TR holder (A)
M
M N
N
M
Fig.9
a
TH-V70R
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P.TR holder (B)
1
2
(Bottom side)
Power amplifier
board (A)
2
1
(Bottom side)
P.TR holder (B)
d
CN102
CN103
a
Fig.10
c
CN106
CN105
P.TR holder (A)
b
1
2
(Bottom side)
Power amplifier
board (B)
c
Fig.11
2
1
(Bottom side)
(No.21175)1-21
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