JVC TH-A9 User manual

SERVICE MANUAL
DVD DIGITAL THEATER SYSTEM
No.20926
Mar. 2001
COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.
Printed in Japan
200103(S)
TH-A9
No.20926
Safety precautions
Important for laser products
Preventing static electricity
Dismantling and assembling
the treverse unit
Disassembly method
Discription of major IC's
1-2
1-3
1-4
1-5
1-8
1-22
Areas suffix
J ------------------------- U.S.A.
C ---------------------- Canada
Contents
RM-STHA9J
DVD THEATER SYSTEM
DVD MENU
TUNING UPDOWN
REC
/REW FF
PAUSE
STROBEMEMORY
TV/VIDEO MUTING
F.SEARCHB.SEARCH
PLAY
CHANNELTV VOL VOLUME
STOP
DVD
AUDIOTV/CATV/DBS
STANDBY/ON
VCR
DECODE SUBTITLE TITLE AUDIO
TIME DIGEST ZOOM
VCR
TV
SLEEP
SETTING
TV RETURN FM MODE 100+
AUDIO/
TV/VCR
CAT/DBS
CONTROL
SUBWOOFER EFFECT
CENTER TEST
REAR-R
ENTER
PLAY
MODE
THEATER
POSITION
DSP
MODE
REAR-L
DISPLAY
CHOICEANGLERETURN
SOUND
FM/AM
AUX
SP-PWA9 XV-THA9
SP-XSA9 SP-XSA9
SP-XCA9
VICTOR COMPANY OF JAPAN, LIMITED
AUDIO & COMMUNICATION BUSINESS DIVISION
PERSONAL & MOBILE NETWORK B.U. 10-1,1Chome,Ohwatari-machi,maebashi-city,371-8543,Japan
TH-A9TH-A9

TH-A9
1-2
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 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.).
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.
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
!
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.

TH-A9
1-3
Important for Laser Products
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.

TH-A9
1-4
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.
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
Conductive material
(conductive sheet) or iron plate
(caption)
Anti-static wrist strap

TH-A9
1-5
Shorting
Shorting
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-A9
1-6
XV-THA9 C/J ONLY
Full Fuse Replacement Marking
Graphic symbol mark
(This symbol means fast blow type fuse.)
should be read as follows ;
FUSE CAUTION
FOR CONTINUED PROTECTION AGAINST RISK
OF FIRE, REPLACE ONLY WITH SAME TYPE
AND RATING OF FUSES ;
F901 : 1.6 A / 125 V F901 : 1.6 A / 125 V
XV-THA9 C/J SEULEMENT
Marquage Pour Le Remplacement
Complet De Fusible
PRECAUTIONS SUR LES FUSIBLES
POUR UNE PROTECTION CONTINUE CONTRE
DES RISQUES D'INCENDIE, REMPLACER
SEULEMENT PAR UN FUSIBLE DU MEME TYPE ;
Le symbole graphique (Ce symbole signifie
fusible de type a fusion rapide.)
doit etre interprete comme suit ;
Note : It's means "J" for U.S.A. market model and "C" for canada market model.
Importance Admistering point on the Safety (XV-THA9)

TH-A9
1-7
SP-PWA9 C/J ONLY
Full Fuse Replacement Marking
Graphic symbol mark
(This symbol means fast blow type fuse.)
should be read as follows ;
FUSE CAUTION
FOR CONTINUED PROTECTION AGAINST RISK
OF FIRE, REPLACE ONLY WITH SAME TYPE
AND RATING OF FUSES ;
F401 : 4A / 125 V
F504 : 8A / 125 V
F505 : 8A / 125 V
SP-PWA9 C/J SEULEMENT
Marquage Pour Le Remplacement
Complet De Fusible
PRECAUTIONS SUR LES FUSIBLES
POUR UNE PROTECTION CONTINUE CONTRE
DES RISQUES D'INCENDIE, REMPLACER
SEULEMENT PAR UN FUSIBLE DU MEME TYPE ;
Le symbole graphique (Ce symbole signifie
fusible de type a fusion rapide.)
doit etre interprete comme suit ;
Note : It's means "J" for U.S.A. market model and "C" for canada market model.
Importance Admistering point on the Safety (SP-PWA9)
F401 : 4A / 125 V
F504 : 8A / 125 V
F505 : 8A / 125 V

TH-A9
1-8
Remove the four screws A that retain the DVD door
from the top of the unit.
1.
<Main unit>
Removing the DVD door (See Fig.1)
Prior to performing the following procedure, remove
the DVD door.
Remove the four screws (B) that attach the left and
right side covers of the unit, from the bottom panel.
Remove the left and right side covers by moving
each of them in the direction of the corresponding
arrow.
1.
2.
Removing the right and left side covers
(See Fig.2)
Disassembly method
Fig.1
Fig.2
DVD door
AA
B
B
Right side cover
Left side cover
Bottom panel

TH-A9
1-9
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.
Remove the three screws (C) that retain the front
panel assembly, from the bottom panel of the unit.
Remove four screws (D) that retain the DVD mechanism
base, from the top of the unit.
Remove the three screws (E) from the rear panel of
the unit that retain the DVD mechanism base.
Remove the DVD mechanism together with the front
panel assembly by lifting them upward from the
main unit and moving them toward the front.
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.
Removing the front panel assembly and
the DVD mechanism base
(See Figs.3 to 7)
1.
2.
3.
4.
5.
Remove the front panel assembly and the
DVD mechanism together, just as they were
assembled.
C
DD
Bottom panel
Front panel assembly
DVD mechanism base
Front panel assembly
Front panel assembly DVD mechanism base
E
E
ERear panel
DVD mechanism base
Analog I/O board
CN812
Front panel assembly
DVD servo board
CN101
DVD servo board
CN101 DVD mechanism assembly
LED board
Analog I/O board
CN812
Fig.3
Fig.4
Fig.5
Fig.6
Fig.7

TH-A9
1-10
(Note)
(Note)
(Note)
Prior to performing the following procedure, remove the
left and right side covers.
Also remove the DVD door.
Remove the front panel assembly and the DVD mechanism
base together from the main unit. (See Figs. 3 to 7.)
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.
Separating the front panel assembly and
the DVD mechanism base (See Fig.8)
1.
2.
It is at this stage that the front panel assembly
and the DVD mechanism base are separated
from each other.
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.
Remove the five screws (F) that retain the display board.
Removing the display board (See Fig.9)
1.
Prior to performing the following procedure, remove the
left and right side covers.
Also remove the DVD door.
Remove the four screws (G) from the back of the DVD
mechanism base that retain the DVD mechanism cover.
Remove the DVD mechanism assembly from the DVD
mechanism base.
Removing the DVD mechanism assembly
(See Figs.10 and 11)
1.
2.
This work is possible even when the front
panel assembly is attached to the DVD
mechanism base.
Prior to performing the following procedure, remove the
left and right side covers.
Also remove the DVD door.
Remove two screws (H) that retain the LED board
cover, from the back of the DVD mechanism base.
Remove the LED board by pulling it away from the
DVD mechanism base.
Removing the LED board
(See Figs.10 and 11)
1.
2.
This work is possible even when the front
panel assembly is attached to the DVD
mechanism base.
Fig.8
Fig.9
Fig.10
Fig.11
DVD mechanism base
Engaging points (a) Engaging points (a)
Front panel assembly
Display board
Front panel assembly
F
F
LED board cover
HH
G
G
DVD mechanism cover
DVD mechanism assembly
LED board
DVD mechanism assembly

TH-A9
1-11
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.
Disconnect the card wires from the connectors
CN401 and CN402 on the analog board.
Remove the screw (I) that retains the analog board
bracket from the top of the unit.
Remove the screw (J) and the screw (K) that retain
the analog board from the rear panel of the unit.
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.
Remove two screws (L) that attach the analog board
to the analog board bracket.
Removing the analog board
(See Figs.12 to 14)
1.
2.
3.
4.
5.
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.
Remove the three screws (M) that retain the tuner
assembly, from the rear panel of the unit.
Disconnect the card wire from the connector CN1 on
the tuner assembly.
Removing the tuner assembly
(See Figs.12 and 13)
1.
2.
Fig.12
Fig.13
Fig.14
Analog board
CN401 Analog board
CN1
Tuner assembly
I
Analog board bracket
Engaging
point (b)
Analog board
CN402
Tuner assembly CN1
Analog board bracket
CN402
Analog board
CN401
J
K
M
Engaging point (b)
Analog board
L
L
Analog board bracket

TH-A9
1-12
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.
Disconnect the wire from the connector CN106 on
the analog input/output board.
Remove the two screws (P) that retain the gear
motor assembly and remove the assembly in the
direction of the arrow.
Remove the belt from the gear motor assembly.
Remove two screws Q that retain the gear motor.
(Note)
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.
Disconnect the wire from the connector CN972 on
the power supply board.
Remove the two screws N that retain the fan motor
assembly, from the right side of the unit.
Remove the two screws (O) that attach the fan motor
assembly to the fan bracket.
Removing the fan motor assembly
(See Figs.15 and 16)
1.
2.
3.
When reassembling, check that the gear motor
assembly is engaged properly with the door arm
assembly at the engaging points (c) and (d).
Removing the gear motor assembly
(See Figs.17 to 19)
1.
2.
3.
4.
N
Fig.15
Fig.16
Fig.17
Fig.18
Fig.19
N
Fan motor assembly
Power supply board
CN972
O
O
Fan motor
Fan bracket
Gear motor assembly
Analog I/O board
CN106
P
Analog I/O board
CN106
Gear motor assembly
P
P
Engaging
point (c)
Engaging
point (d)
Gear motor
Belt
Q

TH-A9
1-13
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.
Also remove the analog board.
Also remove the gear motor assembly.
Disconnect the wires from the connectors CN810
and CN811 on the analog input/output board.
Remove the four screws (R) that retain the door arm
assembly, from the top of the unit.
Remove the two screws (S) that retain the door arm
assembly, from the left and right sides of the unit.
Removing the door arm assembly
(See Figs.20 to 23)
1.
2.
3.
R
Analog I/O board
CN811
Door arm assembly
Analog I/O board
CN810
Power supply
board
Door arm assembly
R
R
S
Door arm assembly
S
R
Analog I/O board
CN810
Door arm assembly
Fig.20
Fig.21
Fig.22
Fig.23

TH-A9
1-14
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 the DVD
mechanism base.
Also remove the analog board.
Also remove the gear motor assembly.
Also remove the door arm assembly.
Remove the two screws (U) that retain the door arm
board (L).
Remove two screws (U) that retain the door arm
board (R).
Removing the door arm boards (L) and (R)
(See Figs.24 and 25)
1.
2.
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.
Remove the screw (V) that retains the power supply
board, from the top of the unit.
Remove three screws (W) that retain the power
supply board, from the rear panel of the unit.
Pull out the power supply board from clamp a.
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 CN952 from
the analog input/output board.
Removing the power supply board
(See Figs.26 and 27)
1.
2.
3.
4.
U
Door arm board (L)
U
U
U
Door arm board (R)
Analog I/O board Power supply board
Power supply board
CN972
V
CN952
CN951
Power supply board
CN952
CN951
W
W
Rear panel
Fig.24
Fig.25
Fig.26
Fig.27
Clamp a
Clamp a

TH-A9
1-15
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.
Also remove the analog board.
Also remove the gear motor assembly.
Also remove the door arm assembly.
Remove the three screws (X) that retain the AV
decoder board cover, from the top of the unit and
remove the screw (X) that retains the analog
input/output board.
IF it is required to separate the AV decoder board
from the analog input/output board, unplug the
connectors CN501, CN502 and CN503 on the AV
decoder board from the analog input/output board.
Remove the four screws (Y) that retain the analog
input/output board, from the rear panel of the unit.
This procedure also detaches the rear panel.
(Note) The analog input/output board can be removed
even when it is engaged with the AV decoder
board.
Removing the AV decoder board and
analog input/output board
(See Figs.28 to 30)
1.
2.
3.
X
Analog I/O board
X
X
AV decoder board cover
XX
X
X
Y
Y
Analog I/O board
AV decoder board cover
Analog I/O board
CN502
CN503
CN501
AV decoder board
CN101
Fig.30
Fig.29
Fig.28

TH-A9
1-16
Remove the four screws A attaching the heat sink
cover.
1.
<Speaker>
Removing the heat sink cover (See Fig.1)
Prior to performing the following procedure, remove
the heat sink.
Remove the eigth screws B attaching the amplifier
assembly on the back of the body.
Move the amplifier assembly backward and discon-
nect the harness from connector CN109 in the lower
part of the amplifier assembly.
Pull out the volume knob.
Remove the ten screws C attaching the heat sink
cover.
Remove the ten screws D and the one screw E at-
taching the amplifier cover.
1.
2.
3.
4.
5.
Removing the amplifier assembly and
the amplifier cover (See Figs.2 and 3)
Disassembly method
Fig.2Fig.3
Amplifier
assembly
Amplifier
cover
Amplifier
assembly
Volume knob
Amplifier
assembly
Amplifier
cover
Heat sink
cover A
A
C
CC
C
C
C
CC
C
C
D
D
D
D
D
E
D
Amplifier
cover
B
B
B
Fig.1
B

TH-A9
1-17
Prior to performing the following procedure, remove
the heat sink cover, the amplifier assembly and the
amplifier cover.
Remove the two screws F attaching the preamplifier
board to the bracket.
Disconnect connector CN101 on the preamplifier
board from the main amplifier board.
Pull out the switch knob.
Remove the nut and the two screws G attaching the
bracket.
1.
2.
3.
4.
Removing the preamplifier board
(See Figs.4 to 6)
Prior to performing the following procedure, remove
the heat sink cover, amplifier assembly and the
amplifier cover.
Disconnect the wire from the connectors CN107 and
CN108 on the power supply & SP terminal board.
Unplug the connectors CN110 and CN111 on the
power supply & SP terminal board from the main
amplifier board.
1.
2.
Removing the power supply & SP terminal
board (See Figs.4 and 5)
Fig.4
Main amplifier
board
Power supply &
SP terminal
board
Preamplifier
board
Preamplifier
board
Braket
Nut
Switch knob
Fig.5
Fig.6
Power supply &
SP terminal
board
Main amplifier board
Braket
Preamplifier
board
F
F
CN108
CN107
CN101
CN111
CN110
CN108
CN107
CN101
G
G

TH-A9
1-18
Prior to performing the following procedure, remove the
heat sink cover, amplifier assembly, the amplifier cover,
the preamplifier board, the power supply & SP terminal
board, the main amplifier board.
Remove the four screws K attaching the power
amplifier board (A) to the heat sink.
Release the four joint hooks a bent and attached to
the outside of the power amplifier board (A).
Move the power amplifier board (A) in the direction of
the arrow to release joint b and remove the power
amplifier board (A) from the bracket (A).
1.
2.
3.
Removing the power amplifier board (A)
(See Figs.9 and 10)
Prior to performing the following procedure, remove the
heat sink cover, the amplifier board, the amplifier
cover, the preamplifier board and the power supply &
SP terminal board.
Disconnect the harness from connector CN104 on
the main amplifier board.
Remove the seven screws H and the main amplifier
board with the heat sink.
Remove the two screws I attaching the power
amplifier board (A) and the two screws J attaching
the power amplifier board (B) on the underside of the
main amplifier board.
Disconnect connector CN102 and CN103 on the
power amplifier board (A) and CN105 and CN106 on
the power amplifier board (B) from the main amplifier
board respectively.
1.
2.
3.
4.
Removing the Main amplifier Board
(See Figs.7 and 8)
H
Fig.7
Fig.8
Fig.9
Fig.10
H
IJ
IJ
LK
L
L
K
K
K
CN104
CN102
CN103
CN106
CN105
Power amplifier
board (A)
Power amplifier
board (A)
Power amplifier
board (A)
Braket(A)
Joint a
Hooks
Joint a
Joint b
CN102
CN103 Braket (B)
Heat sink
CN103
CN102
CN106
CN105
Power amplifier
board (B)
Power amplifier
board (B)
Power
transformer
Main amplifier
board
Braket (A)
Main amplifier
board
H
H

TH-A9
1-19
Prior to performing the following procedure, remove the
heat sink cover, the amplifier assembly, the amplifier
cover, the preamplifier board, the power supply & SP
terminal board, the main amplifier board and power
amplifier board (A).
Remove the four screws L attaching the power
amplifier board (B) to the heat sink.
Release the four joint hooks c bent and attached to
the outside of the power amplifier board (B).
Move the power amplifier board (B) in the direction of
the arrow to release joint d and remove the power
amplifier board (B) from the bracket (B).
Removing the power amplifier board (B)
(See Figs.9 and 11)
1.
2.
3.
Prior to performing the following procedure, remove
the heat sink cover, the amplifier assembly, the
amplifier cover, the preamplifier board, the power
supply & SP terminal board, the main amplifier
board, the power amplifier board (A) and power
amplifier board (B).
Disconnect the harness from connector CN104 on
the main amplifier board.
Disconnect the wire from connector CN107 on the
power supply & SP terminal board.
Remove the four screws M attaching the power
transformer.
Removing the power transformer
(See Figs.12 and 13)
1.
2.
3.
Prior to performing the following procedure, remove
the heat sink cover, the amplifier assembly, the
amplifier cover, the preamplifier board, the power
supply & SP terminal board, the main amplidier
board, the power amplifier board (A), the power
amplifier board (B) and power transformer.
Disconnect the wire from connector CN108 on the
power supply & SP terminal board.
Remove the two screws N attaching the AC power
cord.
Removing the AC power cord
(See Fig.12)
1.
2.
CN101
Fig.11
Fig.12
Fig.13
Hooks
Main amplifier
board
Power supply
& SP terminal
board
Power supply
& SP terminal
board
CN104
Power
transformer
Joint c
Joint c
CN106
CN105
Power amplifier
board (B)
M
M
M
Joint d
CN108
N
N
AC cord
Cord stopper
braket
Preamplifier
board
Main amplifier
board
Braket (B)
CN107
CN111
CN110
CN108
CN107

TH-A9
1-20
While holding the STOP and OPEN/CLOSE keys on the main unit depressed, plug the AC power cord into the
power outlet.
The FL display should show "TEST".
Note:
Press the "5" key on the remote controller in the test mode. The DVD laser will turn on and the FL display will
show a message such as "03EXXXX". As the FL display shows a hexadecimal value, check the actual current
value by referring to the conversion table to see if it is OK or not. (The actual laser current value is calculated
by subtracting 15 mA from the value obtained with the conversion table.)
To exit from the test mode, press the POWER key to enter the STAND-BY (power off) mode.
1.
2.
3.
4.
Display of the laser current value
Make sure that no disc is present on the tray.
At first push the power switch to be on. Then the door slides to the position to be able to push the stop button.
After that pull AC plug out.
While holding the STOP and OPEN/CLOSE keys on the main unit depressed, turn on the primary power
supply.
The FL display should show "TEST JC 1".
Press the ENTER key on the remote controller.
Initialization of the EEPROM starts (and lasts for about 3 seconds). The initialization has completed when the
FL display shows "EEPROM" at the center.
Now the EEPROM initialization is complete.
No key is accepted during the EEPROM initialization.
To exit from the test mode, press the POWER key to enter the STAND-BY mode.
1.
2.
3.
4.
5.
6.
Initialization of EEPROM
When the power is in the STAND-BY mode or OFF, the stop key is hidden behind the door.
Therefore, to facilitate the entry in the test mode, slide the door in advance so that the STOP key can
be pressed even when the AC power is turned off by unplugging the AC power cord.