JVC TH-V70 User manual

TH-V70
No.21089
Jul. 2002
COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.
SERVICE MANUAL
Contents
Safety precautions
Preventing static electricity
Importance administering point
on the safety
1-2
1-3
1-4
1-6
1-21
1-22~54
Disassembly method
Adjustment method
Description of major ICs
TH-V70
Area suffix
J ----------------------------- U.S.A.
C -------------------------- Canada
DVD DIGITAL THEATER SYSTEM
SP-PWV70 XV-THV70
SP-XCV70 SP-XSV70SP-XSV70
SP-XSV70SP-XSV70

TH-V70
1-2
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 manufacturer`s 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 re-assembling.
5. Leakage currnet check (Electrical shock hazard testing)
After re-assembling 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 10W resistor paralleled by a 0.15 F 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 meausre 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. 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.
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
!
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.
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.
(This regulation does not correspond to J and C version.)

TH-V70
1-3
Conductive material
(conductive sheet) or iron plate
(caption)
Anti-static wrist strap
Short lands
DVD servo board
Flexible wire CN202
CN201
DVD mechanism assembly
Connector
5. Attention when traverse unit is decomposed
*Please refer to "Disassembly method" in the text for the DVD pickup unit.
Apply solder to the short lands before the flexible wire is disconnected
from the connector 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 lands after
connecting the flexible wire.
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.
Preventing static electricity
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.
2. About the earth processing for the destruction prevention by static electricity
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.
2-1 Ground the workbench
2-2 Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
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.
3. Handling the optical pickup
1.
2.
Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.
Remove solder of the short lands on the flexible wire 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.
Handle the flexible wire carefully as it may break when subjected to strong force.
It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.
4. Handling the traverse unit (optical pickup)
1.
2.
3.
4.

TH-V70
1-4
Importance administering point on the safety
Main board
<Main body section>
Caution: For continued protection against risk of
fire, replace only with same type 1.6A/125V for F901.
This symbol specifies type of fast operating fuse.
Precaution: Pour eviter risques de feux, remplacez
le fusible de surete de F901 comme le meme type
que 1.6A/125V.
Ce sont des fusibles suretes qui functionnes rapide.
F901

TH-V70
1-5
<Speaker section>
Power supply & SP terminal board
F403
F505
Mother board
F504
Caution: For continued protection against risk of
fire, replace only with same type 4A/125V for F403,
8A/125V for F504, 8A/125V for F505.
This symbol specifies type of fast operating fuse.
Precaution: Pour eviter risques de feux, remplacez
le fusible de surete de F403 comme le meme type
que 4A/125V, F504 comme le meme type que
8A/125, et 8A/125V pour F505.
Ce sont des fusibles suretes qui functionnes rapide.

TH-V70
1-6
Fig.1
Fig.2
Fig.3
Fig.4
A
B
C
A
Top plate
Top panel
Top panel
Bottom panel
Bottom panel
bb
a
Disassembly method
<Main body section>
Removing the top plate (See Fig. 1.)
From the top side of the main body, remove the
four screws Aattaching the top plate.
Removing the bottom panel
(See Figs. 2 and 3.)
1.
2.
3.
From the rear side of the main body, remove the
three screws Battaching the bottom panel.
From the bottom side of the main body, remove the
two screws Cattaching the bottom panel.
Remove the bottom panel in an upward direction.
1.
2.
Slide the top panel toward the rear (direction of the
arrow) and disengage it from the engagement
sections aand bof the bottom chassis.
Remove the top panel in an upward direction.
Removing the top panel (See Fig. 4.)
Remove the top plate.
Remove the bottom panel.

TH-V70
1-7
Fig.5
Fig.7
Fig.6
Fig.8
DVD mechanism
assembly
DVD servo board
Main board
CN812
LED board
Push button
D
D
F
D
Claw c
Claws d
Bottom
chassis hole
Bottom chassis
Front panel assembly
Claws d
CN502
CN803 CN801
CN503
Main board
Wire
Card wires
Wire clamp
CN802 CN813
CN106
Front panel assembly
Bottom chassis
Wire holder
CN814
IC953
E
Removing the DVD mechanism
assembly (See Figs. 5 and 6.)
1.
2.
3.
4.
From the top side of the main body, disengage the
claw cof the DVD mechanism assembly and then
remove the push button.
Remove the five screws Dand screw Eattaching
the DVD mechanism assembly.
Disconnect the wire from connector CN812 on the
LED board.
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.
Removing the front panel assembly
(See Figs. 7 and 8.)
1.
2.
3.
4.
5.
6.
Remove the wire clamp bundling the wires of the
front panel assembly.
Remove the card wire of the front panel assembly
from the wire holder.
Disconnect the wires from connectors CN106 and
CN814 on the main board.
Disconnect the card wires from connectors CN802
and CN813 on the main board.
From the front side of the main body, remove the
two screws Fattaching the front panel assembly.
Disengage the claws dof the front panel assembly
from the bottom chassis and then remove the front
panel assembly in the direction of arrow.
Remove the top plate.
Remove the bottom panel.
Remove the top panel.
Remove the top plate.
Remove the bottom panel.
Remove the top panel.
Remove the DVD mechanism assembly.
[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).

TH-V70
1-8
Fig.9
Fig.10
Rear panel
J
L
H
K
G
Card wire
DSP/Audio
board
Card wire
CN806
CN805
CN592
Tuner
Compulink board
Removing the tuner
(See Figs. 9 and 10.)
1.
2.
3.
Disconnect the card wire from connector CN805 on
the main board.
From the rear side of the main body, remove the
two screws L attaching the tuner.
Take out the tuner from the bottom chassis.
Removing the compulink board
(See Figs. 9 and 10.)
1.
2.
3.
Disconnect the card wire from connector CN592 on
the compulink board.
From the rear side of the main body, remove the
screw Kattaching the compulink board.
Take out the compulink board from the bottom
chassis.
Remove the top plate.
Remove the bottom panel.
Remove the top panel.
Remove the DVD mechanism assembly.
Remove the top plate.
Remove the bottom panel.
Remove the top panel.
Remove the DVD mechanism assembly.
Removing the DSP/Audio board
(See Figs. 9 and 10.)
1.
2.
3.
From the top side of the main body, remove a
screw Gattaching the DSP/Audio board.
From the rear side of the main body, remove the
screw Hand two screws Jattaching the DSP/Audio
board.
Take out the DSP/Audio board from the bottom
chassis and then disconnect the card wire from
connector CN806 on the main board.
Remove the top plate.
Remove the bottom panel.
Remove the top panel.
Remove the DVD mechanism assembly.
[Reference]
Before attaching the DSP/Audio board, connect
the card wire to the connector CN806 on the
main board.

TH-V70
1-9
Fig.11
Fig.12
Fig.13
Fig.14
Wire holder
Main board
CN592
M
M
M
M'
Wire clamp
Bottom chassis Fan motor Front panel
assembly
M
CN972
CN972
CN805
Rear panel N
P
Tuner
Compulink board
Insert this wire into the notch.
Tie band
Wire clamp
Fan motor wire
Fan motor wire
Card wire
Removing the main board
(See Figs. 11 and 12.)
1.
2.
3.
4.
5.
6.
7.
Disconnect the card wire from connector CN805 on
the main board.
Remove the wire clamp bundling the fan motor wire
and then disconnect the wire from connector
CN972 on the main board.
Disconnect the card wire from connector CN592 on
the compulink board.
Remove the five screws Mand screw M' attaching
the main board.
From the rear side of the main body, remove the
three screws Nattaching the main board.
Remove the rear panel with the tuner and
compulink board.
Take out the main board from the bottom chassis.
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.
[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.)
Removing the fan motor
(See Figs. 13 and 14.)
1.
2.
3.
Remove the wire clamp and tie band bundling the
fan motor wire.
Disconnect the wire from connector CN972 on the
main board.
From the left side of the main body, remove the two
screws Pattaching the fan motor.
Remove the top plate.
Remove the bottom panel.
Remove the top panel.
Remove the DVD mechanism assembly.
[Reference]
After mounting the fan motor, bundle the fan
motor wire using the wire clamp.

TH-V70
1-10
Fig.15
Fig.16
Fig.17
Fig.18
Fig.19
Fig.20
Switch board
Door motor assembly
Front panel assembly
(Back side)
W
X
R
Q
Front panel assembly
(Back side) Rod gear assembly
e
Front base
Moving panel assembly
Front base
f
gg
Moving panel
Moving base
Hole
Front board
h
Card wire
T
Door motor
Stop washer
Washer
Open/close
board
Gear 2
Clutch assembly
S
Door motor assembly
<Front panel assembly section>
Removing the switch board
(See Fig. 15.)
From the back side of the front panel assembly,
remove the four screws Qattaching the switch
board.
Remove the top plate.
Remove the bottom panel.
Remove the top panel.
Remove the DVD mechanism assembly.
Remove the front panel assembly.
Removing the front board
(See Figs. 17 to 20.)
[Reference]
Before attaching the moving base, pass the
card wire of the front board through the hole
on the moving base. (See Fig.19.)
1.
2.
From the back side of the front panel assembly,
remove the two screws Rattaching the door motor
assembly.
Remove the screw Sattaching the open/close
board of the door motor assembly.
Removing the open/close board
(See Figs. 15 and 16.)
Removing the door motor (See Fig. 16.)
1.
2.
3.
4.
5.
6.
7.
While widening section eof the front base in the
direction of the arrow, remove the rod gear
assembly.
Slide the moving panel assembly all the way in the
direction of the arrow.
While slightly widening sections ftoward the front,
take out the moving panel assembly in the direction
of the arrow.
Remove the two screws Wattaching the moving
base of the moving panel assembly.
Disengage the engagement sections gon the
inside of the moving base and at the inside of the
moving panel assembly and remove the moving
base.
Remove the two screws Xattaching the front
board.
Disengage the claws hof the moving panel and
remove the front board.
1.
2.
3.
Remove the stop washers attaching the clutch
assembly and gear 2.
Remove the clutch assembly, washer and Gear 2.
Remove the two screws Tattaching the door
motor.
Remove the door motor assembly.

TH-V70
1-11
Fig.1
Fig.2
Fig.3
LED board
Top chassis
Claw a
Short land sections b
CN101
DVD servo board
Flexible wire CN202
CN201
Top chassis
DVD mechanism assembly
Projection e
Projection d
Claw c
B
B
A
DVD mechanism assembly
A
Protector
<DVD mechanism assembly section>
Removing the LED board (See Fig. 1.)
From the top side of the DVD mechanism
assembly, disengage the claw aof the top chassis
attaching the LED board and then remove the LED
board.
[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.
Remove the top plate.
Remove the bottom panel.
Remove the top panel.
Remove the DVD mechanism assembly.
Removing the DVD mechanism
assembly (See Fig. 2.)
Removing the DVD servo board
(See Fig. 3.)
[Caution] In the assembly, be sure to remove
solder from the short land sections
b after connecting the flexible wire.
1.
2.
3.
4.
5.
From the back side of the DVD mechanism
assembly, attach solder to the short land sections b
of the flexible wire that is connected to the
connector CN101 of the DVD servo board.
Disconnect the flexible wire from connector CN101
on the DVD servo board.
Disconnect the card wires from connectors CN201
and CN202 on the DVD servo board.
Remove the two screws Battaching the DVD servo
board.
While pushing the claw cof the DVD mechanism
assembly in the direction of the arrow, remove the
DVD servo board from the projections dand ein an
upward direction.
Extend the both sides of the protector, and then
raise the protector in the direction of arrow.
Remove the three screws Aattaching the DVD
mechanism assembly on the top chassis.
1.
2.

TH-V70
1-12
Fig.4
Fig.5
Fig.6
Fig.7
Claw f
DVD traverse mechanism assembly
DVD traverse mechanism assembly
Section i
Section h
Claw g
C
Shaft
Bracket DVD pickup unit
Shaft
C
E
D
DVD pickup unit
Thrust spring
Shaft
DVD pickup unit
Section jLead screw
SW. actuator
Removing the DVD traverse
mechanism assembly (See Fig. 4.)
1.
2.
Remove the DVD servo board.
Remove the two screws Cattaching the DVD
traverse mechanism assembly.
Disengage the claw fattaching the DVD traverse
mechanism assembly and then take out the DVD
traverse mechanism assembly.
Removing the DVD pickup unit
(See Figs. 5 to 7.)
1.
2.
3.
4.
5.
6.
Remove the DVD servo board.
Remove the DVD traverse mechanism assembly.
From the top side of the DVD traverse mechanism
assembly, remove the screw Dattaching the
bracket.
Remove the claw gattaching the thrust spring and
then take out the torsion spring.
Remove the lead screw from the section hand
then remove the shaft from the section i.
Disengage the section jof the DVD pickup unit and
then remove the DVD pickup unit with the shaft.
Pull the shaft out of the DVD pickup unit.
Remove the two screws Eattaching the SW.
actuator.

TH-V70
1-13
Fig.8
Fig.9
Fig.10
Fig.11
Section j
Section i
Section i'
DVD pickup unit
FF
Section h
Section k
Shaft
Spindle motor
board
Spindle motor
board
DVD pickup unit
Feed motor
wire
Feed motor
Remove the solders.
Lead screw
Attaching the DVD pickup unit
(See Figs. 5 to 9.)
1.
2.
3.
4.
5.
6.
Attach the SW. actuator and shaft to the DVD
pickup unit. (See Fig.7.)
Engage the section jof 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 iand i' of the DVD
traverse mechanism assembly.
Slide the DVD pickup unit all the way in the
direction of the arrow.
Mesh the lead screw to the section kof DVD
pickup unit and then set the end of the lead screw
to the section h.
Attach the thrust spring. (See Fig.6.)
Attach the bracket. (See Fig.5.)
[Reference]
Refer to the explanation of "Removing the
DVD pickup unit" on the preceding page.
Removing the spindle motor board
(See Figs. 10 and 11.)
1.
2.
Remove the DVD servo board.
Remove the DVD traverse mechanism assembly.
From the top side of the DVD traverse mechanism
assembly, remove the feed motor wire that is
soldered to the spindle motor board.
From the back side of the DVD traverse mechanism
assembly, remove the three screws Fattaching the
spindle motor board.

TH-V70
1-14
Fig.12
Fig.13
Fig.14
Traverse
mechanism
assembly
Feed motor
Spindle motor board
Bracket
G G
G
H
D
Feed motor
Feed gear M
Remove the solders.
Claw g
Traverse
mechanism assembly
Feed motor wire
Torsion spring
Lead screw
Mechanism
base
Removing the feed motor
(See Figs. 12 to 14.)
1.
2.
3.
4.
5.
6.
7.
8.
Remove the DVD servo board.
Remove the DVD traverse mechanism assembly.
Remove the four screws Gattaching the traverse
mechanism assembly.
Take out the traverse mechanism assembly from
the mechanism base.
Remove the screw Dattaching the bracket and
take out the bracket.
Disengage the claw gattaching the thrust spring
and take out the thrust spring.
Pull out the lead screw in the direction of arrow.
Remove the feed gear M.
Remove the feed motor wire that is soldered to the
spindle motor board.
Remove the two screws Hattaching the feed motor
and take out the feed motor.

TH-V70
1-15
Fig.15
Fig.16
Fig.17
CD mechanism assembly Clamper base assembly
Roller holder
assembly
Belt
Loading motor assembly
CN103 CN104
Switch board
CN101
J
K
L
L
M
K
M
Roller holder
assembly
Removing the switch board
(See Fig.15.)
1.
2.
Remove the DVD mechanism assembly.
From the top side of the CD mechanism assembly,
remove the screw Jattaching the switch board.
Lift the switch board slightly and then remove the
wire from connector CN101 on the switch board.
Removing the loading motor assembly
(See Figs.3, 15 to 17.)
1.
2.
3.
4.
5.
6.
7.
Remove the DVD mechanism assembly.
From the back side of the DVD mechanism
assembly, disconnect the card wire from connector
CN202 on the DVD servo board. (See Fig.3.)
From the top side of the CD mechanism assembly,
remove the two screws Kattaching the clamper
base assembly.
Disconnect the wire from connector CN101 on the
switch board while lifting the clamper base
assembly slightly and remove the clamper base
assembly.
Remove the three screws Lattaching the roller
holder assembly and take out the roller holder
assembly.
Disconnect the wires from connectors CN103 and
CN104 on the loading motor assembly.
Remove the belt of the loading motor assembly.
Remove the two screws Mattaching the loading
motor assembly and take out the loading motor
assembly.

TH-V70
1-16
Fig.1
Fig.2
Fig.3
Amplifier assembly A
A
CC D
B
B
C
C
CC
D
C
C
DD
D
D
E
BB
Amplifier assembly
Amplifier assembly
Knob
Rear panel
CN109
Heat sink cover
<Speaker section>
Removing the amplifier assembly
(See Figs. 1 and 2.)
1.
2.
3.
From the rear side of the speaker main body,
remove the four screws Aattaching the heat sink
cover and then remove the heat sink cover.
Remove the eight screws Battaching the amplifier
assembly.
Move the amplifier assembly backward and
disconnect the wire from connector CN109 in the
lower part of the amplifier assembly.
1.
2.
Pull out the knob.
Remove the ten screws C, ten screws Dand screw
Eattaching the rear panel.
Removing the rear panel (See Fig. 3.)
Remove the amplifier assembly.

TH-V70
1-17
Fig.4
Heat sink
Fig.5
Fig.6
Power transformer
Volume bracket
Mother board
Pre-amplifier
board
Pre-amplifier board
Pre-amplifier board
CN101
Nut
Power supply & SP
terminal board
Volume bracket
CN201
CN101
Volume bracket
F
H
H
G
G
CN211
Mother board
Power cord
CN210
CN108
CN111
CN110
CN107
Push button
AC bracket
Removing the pre-amplifier board
(See Figs. 4 to 6.)
1.
2.
3.
4.
Remove the two screws F attaching the volume
bracket.
Disconnect the pre-amplifier board from the
connector CN201 on the mother board and take
out the pre-amplifier board.
Pull out the push button.
Remove the two screws Gand nut attaching the
volume bracket.
Remove the rear panel.
Removing the power supply & SP
terminal board (See Figs. 4 and 5.)
1.
2.
3.
4.
Remove the two screws Hattaching the AC
bracket.
Disconnect the power supply & SP terminal board
from the connectors CN210 and CN211 on the
mother board.
Disconnect the wire from connector CN107 on the
power supply & SP terminal board.
Disconnect the power cord from connector CN108
on the power supply & SP terminal board.
Remove the rear panel.

TH-V70
1-18
Fig.7
Fig.8
Fig.9
Fig.10
Power transformer
CN104
Mother board
Mold base
Power amplifier
board (A)
Power amplifier
board (A)
P.TR holder (A)
P.TR holder (A)
P.TR holder (B)
Power amplifier
board (B)
Power amplifier
board (B)
J
J
N
M
J
J
J
K
MN
L
KL
M N
CN202 CN206
CN203
CN103
CN102
Mother board
Power amplifier
board (A)
CN205
a
a
b
(Bottom side)
1
2
(Bottom side)
1
2
Removing the mother board
(See Figs. 7 and 8.)
1.
2.
3.
4.
5.
Disconnect the wire from the connector CN104 on
the mother board.
Remove the seven screws Jattaching the mother
board.
Take out the mother board with the power amplifier
board (A,B).
From the bottom side of the mother board, remove
the two screws Kand two screws Lattaching the
power amplifier board (A,B).
Remove the power amplifier board (A,B) from
connectors CN202, CN203, CN205 and CN206 on
the mother board.
Remove the rear panel.
Remove the pre-amplifier board.
Remove the power supply & SP terminal board.
Removing the power amplifier
board (A) (See Figs. 9 and 10.)
1.
2.
3.
Remove the four screws Mattaching the heat sink
to the power amplifier board (A).
From the bottom side of the power amplifier board
(A), disengage the four engagement sections a.
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 band
remove the power amplifier board (A) from the P.TR
holder (A).
Remove the mother board.

TH-V70
1-19
Fig.11
Fig.12
Fig.13
Power
transformer
CN104
Mother board
Mold base
P
Power supply & SP
terminal board
Power supply & SP
terminal board
CN107
P.TR holder (B)
CN105
CN106
Power amplifier
board (B)
c
c
d
(Bottom side)
1
2
(Bottom side)
1
2
P
P
Transformer
bracket
Removing the power transformer
(See Figs. 12 and 13.)
1.
2.
3.
Remove the wire from the connector CN104 on the
mother board.
Disconnect the wire from the connector CN107 on
the power supply & SP terminal board.
Remove the four screws Pattaching the power
transformer and then remove the power
transformer from the transformer bracket of the
mold base.
Removing the power amplifier
board (B) (See Figs. 9 and 11.)
1.
2.
3.
Remove the four screws Nattaching the heat sink
to the power amplifier board (B). (See Fig.9.)
From the bottom side of the power amplifier board
(B), disengage the four engagement sections c.
From the top side of the power amplifier board (B),
slide the P.TR holder (B) in the direction of the
arrow to disengage the engagement section dand
remove the power amplifier board (B) from the P.TR
holder (B).
Remove the mother board.
Remove the rear panel.

TH-V70
1-20
JVC
Fig.14
Fig.15
Fig.16
Fig.18
Fig.17
Ornament panel
Ornament panel
Ornament panel
Terminal
Speaker main body
LED indicator
Q
Cushioning plate, etc.
Cushioning plate, etc.
Flat-bladed
screwdriver, etc.
RR
Q
Speaker main body
Speaker
CN109
Speaker
Removing the LED indicator
(See Figs. 14 to 16.)
Insert the tip of a flat-bladed screwdriver or a
similar tool into the space between the speaker
main body and the ornament panel (the section
indicated by the arrows), and lift the net little by little
to remove.
[Note] To prevent damaging the ornament
panel and speaker main body, insert
cushioning plates etc. above and below
the tip of the flat-bladed screwdriver or a
similar tool.
2.
3.
From the back side of the ornament panel, remove
the two screws Qattaching the LED indicator.
Disconnect the wire from connector CN109 on the
LED indicator.
Removing the speaker
(See Figs. 17 and 18.)
1.
2.
3.
Remove the eight screws Rattaching the speaker.
Take out the speaker.
Disconnect the wires from the terminals of the
speaker.
1.