JVC TH-A9R Service Manual
SERVICE MANUAL
DVD DIGITAL CINEMA SYSTEM
TH-A9R
SP-XSA9
SP-XCA9
SP-XSA9
AUX
TITLE
ZOOM
CONTROL
VCR
TV
SLEEP
SETTING
TV RETURN FM MODE
PLAY
MODE
THEATER
POSITION
CHANNELTV VOL VOLUME
/REW
REC
TH-A9RTH-A9R
STANDBY/ON
AUDIOTV/CATV/DBS
VCR
DVD
FM/AM
DECODE
SUBTITLE
AUDIO
TIME
DIGEST
DISPLAY
CHOICEANGLERETURN
SOUND
SUBWOOFER
EFFECT
CENTER
TEST
REAR-L
REAR-R
100+
AUDIO/
TV/VCR
CAT/DBS
ENTER
DSP
MODE
TV/VIDEO
MUTING
F.SEARCHB.SEARCH
FF
PLAY
UPDOWN
TUNING
PAUSE
STOP
STROBEMEMORY
DVD MENU
SP-PWA9
Contents
Safety precautions
Important for laser products
Preventing static electricity
Dismantling and assembling
the treverse unit
Disassembly method
Discription of major IC's
XV-THA9R
RM-STHA9J
DVD THEATER SYSTEM
Areas suffix
B --------------------------- U.K
E ------- Continental Europe
EN -------- Northern Europe
1-2
1-3
1-4
1-5
1-6
1-20
COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.
No.20944
Apr. 2001
TH-A9R
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 eachexposed 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.).
0.15 F AC TYPE
1500 10W
Good earth ground
AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)
Place this
probe on
each exposed
metal part.
!
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.
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.
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
Important for Laser Products
TH-A9R
1.CLASS a 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
laserradiation and is equipped with safety switches
whichprevent 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.
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.
1-3
TH-A9R
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.
1.1. 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.
1.1.1. Ground the workbench
1. 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.
1.1.2. Ground yourself
1. 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
1.1.3. 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 pickup are shorted. After replacement, return the shorted parts to their original condition.
(Refer to the text.)
2. 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.
1.2. 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. It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it
1-4
Dismantling and assembling the traverse unit
1. Notice regarding replacement of optical pickup
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 to the optical pickup or connected devices.
(Refer to the section regarding anti-static measures.)
1. Do not touch the area around the laser diode and actuator.
2. Do not check the laser diode using a tester, as the diode may easily be destroyed.
3. It is recommended that you use a grounded soldering iron when shorting or removing the laser diode.
Recommended soldering iron: HAKKO ESD-compatible product
4. Solder the land on the optical pickup's flexible cable.
Note : Short the land after shorting the terminal on the flexible cable using a clip, etc., when using an
ungrounded soldering iron.
Note : After shorting the laser diode according to the procedure above, remove the solder according
to the text explanation.
TH-A9R
Shorting
Shorting
1-5
TH-A9R
Disassembly method
<Main unit>
Removing the DVD door (See Fig.1)
1.
Remove the four screws A that retain the DVD door
from the top of the unit.
Removing the right and left side covers
(See Fig.2)
A
A
DVD door
Fig.1
Right side cover
Prior to performing the following procedure, remove
the DVD door.
1.
Remove the four screws (B) that attach the left and
right side covers of the unit, from the bottom panel.
2.
Remove the left and right side covers by moving
each of them in the direction of the corresponding
arrow.
B
Left side cover
B
Bottom panel
Fig.2
1-6
TH-A9R
Removing the front panel assembly and
the DVD mechanism base
(See Figs.3 to 7)
Prior to performing the following procedure, remove the
left and right side covers.
Also remove the DVD door.
(Note)
The mechanism slide switch for pickup protection
should be set to the SHORTED position.
1.
Remove the three screws (C) that retain the front
panel assembly, from the bottom panel of the unit.
2.
Remove four screws (D) that retain the DVD mechanism
base, from the top of the unit.
3.
Remove the three screws (E) from the rear panel of
the unit that retain the DVD mechanism base.
4.
Remove the DVD mechanism together with the front
panel assembly by lifting them upward from the
main unit and moving them toward the front.
5.
Disconnect the card wire of the DVD mechanism
from the connector CN101 on the DVD servo board.
Disconnect the wire of the LED board from the
connector CN812 on the analog input/output board.
Remove the front panel assembly and the
DVD mechanism together, just as they were
assembled.
C
Bottom panel
Front panel assembly
Fig.3
DVD mechanism base
DD
Front panel assembly
Fig.4
Front panel assembly
DVD mechanism base
E
DVD servo board
CN101
DVD mechanism assembly
Analog I/O board
Fig.7
CN812
LED board
E
Front panel assembly
DVD servo board
CN101
Fig.6
Rear panel
Fig.5
E
DVD mechanism base
Analog I/O board
CN812
1-7
TH-A9R
Separating the front panel assembly and
the DVD mechanism base (See Fig.8)
Prior to performing the following procedure, remove the
left and right side covers.
Also remove the DVD door.
1.
Remove the front panel assembly and the DVD mechanism
base together from the main unit. (See Figs. 3 to 7.)
2.
On the back of the DVD mechanism base, disengage the
four claws at the engaging points (a) that attach the front
panel assembly to the DVD mechanism base, and then
pull out the front panel assembly in the direction of the
arrow to separate it from the DVD mechanism base.
(Note)
It is at this stage that the front panel assembly
and the DVD mechanism base are separated
from each other.
Removing the display board (See Fig.9)
Prior to performing the following procedure, remove the
left and right side covers.
Also remove the DVD door.
Also separate the front panel assembly from the DVD
mechanism base.
1.
Remove the five screws (F) that retain the display board.
Engaging points (a)
F
Front panel assembly
DVD mechanism base
Engaging points (a)
Front panel assembly
Fig.8
Display board
Fig.9
F
Removing the DVD mechanism assembly
(See Figs.10 and 11)
Prior to performing the following procedure, remove the
left and right side covers.
Also remove the DVD door.
(Note)
1.
Remove the four screws (G) from the back of the DVD
mechanism base that retain the DVD mechanism cover.
2.
Remove the DVD mechanism assembly from the DVD
mechanism base.
This work is possible even when the front
panel assembly is attached to the DVD
mechanism base.
Removing the LED board
(See Figs.10 and 11)
Prior to performing the following procedure, remove the
left and right side covers.
Also remove the DVD door.
(Note)
This work is possible even when the front
panel assembly is attached to the DVD
mechanism base.
LED board cover
G
DVD mechanism cover
DVD mechanism assembly
HH
G
DVD mechanism assembly
Fig.10
1.
Remove two screws (H) that retain the LED board
cover, from the back of the DVD mechanism base.
2.
Remove the LED board by pulling it away from the
DVD mechanism base.
1-8
Fig.11
LED board
TH-A9R
Removing the analog board
(See Figs.12 to 14)
Prior to performing the following procedure, remove
the left and right side covers.
Also remove the DVD door.
Also remove the front panel assembly and DVD
mechanism base.
1.
Disconnect the card wires from the connectors
CN401 and CN402 on the analog board.
2.
Remove the screw (I) that retains the analog board
bracket from the top of the unit.
3.
Remove the screw (J) and the screw (K) that retain
the analog board from the rear panel of the unit.
4.
Disengage the analog board bracket and the gear
motor assembly by moving the engaged part (b)
upward. Then move the analog board in the direction
of the arrow, and remove it as if pulling it out of the
rear panel.
Engaging
point (b)
Analog board
CN401
Analog board
Tuner assembly
Analog board
CN402
CN1
Tuner assembly
Analog board bracket
Fig.12
Analog board bracket
CN1
CN402
I
Engaging point (b)
5.
Remove two screws (L) that attach the analog board
to the analog board bracket.
Removing the tuner assembly
(See Figs.12 and 13)
Prior to performing the following procedure, remove
the left and right side covers.
Also remove the DVD door.
Also remove the front panel assembly and the DVD
mechanism base.
1.
Remove the three screws (M) that retain the tuner
assembly, from the rear panel of the unit.
2.
Disconnect the card wire from the connector CN1 on
the tuner assembly.
J
M
Fig.13
Analog board
K
Analog board
CN401
L
Analog board bracket
L
Fig.14
1-9
TH-A9R
Removing the fan motor assembly
(See Figs.15 and 16)
Prior to performing the following procedure, remove the
left and right side covers.
Also remove the DVD door.
Also remove the front panel assembly and the DVD
mechanism base.
1.
Disconnect the wire from the connector CN972 on
the power supply board.
2.
Remove the two screws (N) that retain the fan motor
assembly, from the right side of the unit.
Power supply board
CN972
N
Fan motor assembly
N
Fig.15
3.
Remove the two screws (O) that attach the fan motor
assembly to the fan bracket.
Removing the gear motor assembly
(See Figs.17 to 19)
Prior to performing the following procedure, remove the
left and right side covers.
Also remove the DVD door.
Also remove the front panel assembly and the DVD
mechanism base.
Also remove the analog board.
1.
Disconnect the wire from the connector CN106 on
the analog input/output board.
2.
Remove the two screws (P) that retain the gear
motor assembly and remove the assembly in the
direction of the arrow.
(Note)
3.
Remove the belt from the gear motor assembly.
4.
Remove two screws Q that retain the gear motor.
When reassembling, check that the gear motor
assembly is engaged properly with the door arm
assembly at the engaging points (c) and (d).
P
O
Fan motor
O
Fan bracket
Fig.16
Gear motor assembly
Analog I/O board
CN106
Fig.17
1-10
Fig.19
Belt
Gear motor
Q
Engaging
point (c)
Engaging
point (d)
P
P
Gear motor assembly
Analog I/O board
CN106
Fig.18
Removing the door arm assembly
(See Figs.20 to 23)
Prior to performing the following procedure, remove
the left and right side covers.
Also remove the DVD door.
Also remove the front panel assembly and the DVD
mechanism base.
Also remove the analog board.
Also remove the gear motor assembly.
1.
Disconnect the wires from the connectors CN810
and CN811 on the analog input/output board.
2.
Remove the four screws (R) that retain the door arm
assembly, from the top of the unit.
3.
Remove the two screws (S) that retain the door arm
assembly, from the left and right sides of the unit.
TH-A9R
Door arm assembly
R
Analog I/O board
CN811
Fig.20
Door arm assembly
Door arm assembly
S
R
Analog I/O board
CN810
R
Analog I/O board
CN810
Power supply
board
Fig.21
Door arm assembly
S
R
Fig.23
Fig.22
1-11
TH-A9R
Removing the door arm boards (L) and (R)
(See Figs.24 and 25)
Prior to performing the following procedure, remove
the left and right side covers.
Also remove the DVD door.
Also remove the front panel assembly and the DVD
mechanism base.
Also remove the analog board.
Also remove the gear motor assembly.
Also remove the door arm assembly.
1.
Remove the two screws (U) that retain the door arm
board (L).
2.
Remove two screws (U) that retain the door arm
board (R).
U
Door arm board (L)
U
Fig.24
U
Door arm board (R)
U
Fig.25
Removing the power supply board
(See Figs.26 and 27)
Prior to performing the following procedure, remove
the left and right side covers.
Also remove the DVD door.
Also remove the front panel assembly and the DVD
mechanism base.
Also remove the analog board.
Also remove the gear motor assembly.
Also remove the door arm assembly.
1.
Remove the screw (V) that retains the power supply
board, from the top of the unit.
2.
Remove three screws (W) that retain the power
supply board, from the rear panel of the unit.
3.
Pull out the power supply board from clamp a.
4.
Disconnect the wire from the connector CN972 on
the power supply board, and then remove the power
supply board in the direction of the arrow while
unplugging the connectors CN951 and CN961 from
the analog input/output board.
Rear panel
W
Analog I/O board
CN951
Power supply board
Power supply board
CN961
Fig.26
Clamp a
V
Power supply board
CN972
CN961
Clamp a
1-12
W
CN951
Fig.27
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