SONY cdx gt373a Service Manual
CDX-GT373A
SERVICE MANUAL
Ver. 1.0 2008.03
• The tuner and CD sections have no adjustments.
SPECIFICATIONS
CD Player section
Signal-to-noise ratio: 120 dB
Frequency response: 10 – 20,000 Hz
Wow and fl utter: Below measurable limit
Tuner section
FM
Tuning range:
87.5 – 107.9 MHz
Antenna (aerial) terminal:
External antenna (aerial) connector
Intermediate frequency: 10.7 MHz/450 kHz
Usable sensitivity: 9 dBf
Selectivity: 75 dB at 400 kHz
Signal-to-noise ratio:
67 dB (stereo), 69 dB (mono)
Harmonic distortion at 1 kHz:
0.5 % (stereo), 0.3 % (mono)
Separation: 35 dB at 1 kHz
Frequency response: 30 – 15,000 Hz
AM
Tuning range: 530 – 1,710 kHz
Antenna (aerial) terminal:
External antenna (aerial) connector
Intermediate frequency: 10.7 MHz/450 kHz
Sensitivity: 30 μV
Power amplifi er section
Outputs: Speaker outputs (sure seal connectors)
Speaker impedance: 4 – 8 ohms
Maximum power output: 52 W × 4 (at 4 ohms)
General
Outputs:
Audio outputs terminal (front, sub/rear
switchable)
Power antenna (aerial) relay control terminal
Power amplifi er control terminal
Inputs:
Antenna (aerial) input terminal
AUX input jack (stereo mini jack)
Tone controls:
Low: ±10 dB at 60 Hz (XPLOD)
Mid: ±10 dB at 1 kHz (XPLOD)
High: ±10 dB at 10 kHz (XPLOD)
E Model
Model Name Using Similar Mechanism CDX-GT272
CD Drive Mechanism Type MG-101TC-188//C
Optical Pick-up Name DAX-25A
Power requirements: 12 V DC car battery
(negative ground (earth))
Dimensions: Approx. 178 × 50 × 179 mm
1
(7
/8 × 2 × 7 1/8 in.) (w/h/d)
Mounting dimensions: Approx.
182 × 53 × 162 mm
(7 1/4 × 2 1/8 × 6 1/2 in.) (w/h/d)
Mass: Approx. 1.2 kg (2 lb 11 oz)
Supplied accessories:
Card remote commander: RM-X151
Parts for installation and connections (1 set)
Design and specifi cations are subject to change
without notice.
9-889-023-01
2008C04-1
2008.03
©
FM/AM COMPACT DISC PLAYER
Sony Corporation
Audio Business Group
Published by Sony Techno Create Corporation
CDX-GT373A
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic break-down because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The fl exible board is easily damaged and should be handled with
care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused
on the disc refl ective surface by the objective lens in the optical
pickup block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be damaged by heat.
TEST DISCS
Please use the following test discs for the check on the CD section.
YDES-18 (Part No. 3-702-101-01)
PATD-012 (Part No. 4-225-203-01)
CAUTION
Use of controls or adjustments or performance of procedures other than
those specifi ed herein may result in hazardous radiation exposure.
If the optical pick-up block is defective, please replace the whole
optical pick-up block.
Never turn the semi-fi xed resistor located at the side of optical
pick-up block.
optical pick-up
This compact disc player is classifi ed as a CLASS 1 LASER
product. The CLASS 1 LASER PRODUCT label is located on the
exterior.
This label is located on the bottom of the chassis.
• CD playback
You can play CD-DA (also containing CD TEXT) and CD-R/
CD-RW (MP3/WMA fi les).
Type of discs Label on the disc
CD-DA
MP3
WMA
UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the leadfree mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40 °C higher
than ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 °C.
Caution: The printed pattern (copper foil) may peel away if the
heated tip is applied for too long, so be careful!
• Strong viscosity
Unleaded solder is more viscous (sticky, less prone to fl ow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.
• Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.
semi-fixed resistor
SAFETY-RELATED COMPONET WARNING!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE
WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS
WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS
MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.
2
TABLE OF CONTENTS
CDX-GT373A
1. SERVICE NOTE ...................................................... 3
2. GENERAL
Location of Controls ....................................................... 5
Connections .................................................................... 5
3. DISASSEMBLY
3-1. Sub Panel Assy ............................................................... 7
3-2. CD Mechanism Block ..................................................... 8
3-3. Main Board ..................................................................... 8
3-4. Microphone (MIC901) .................................................... 9
3-5. Servo Board .................................................................... 9
3-6. Chassis (T) Sub Assy ...................................................... 10
3-7. Roller Arm Assy .............................................................. 10
3-8. Chassis (OP) Assy ........................................................... 11
3-9. Chucking Arm Sub Assy ................................................. 11
3-10. Sled Motor Assy .............................................................. 12
3-11. Optical Pick-up Section .................................................. 13
3-12. Optical Pick-up ............................................................... 13
4. DIAGNOSIS FUNCTION ...................................... 14
5. ELECTRICAL ADJUSTMENTS ......................... 16
6. DIAGRAMS
6-1. Block Diagram –Main Section– ..................................... 17
6-2. Block Diagram –Display Section– ................................. 18
6-3. Printed Wiring Board –Main Section– ............................ 19
6-4. Schematic Diagram –Main Section (1/3)– ...................... 20
6-5. Schematic Diagram –Main Section (2/3)– ...................... 21
6-6. Schematic Diagram –Main Section (3/3)– ...................... 22
6-7. Printed Wiring Boards –Key Section– ............................ 23
6-8. Schematic Diagram –Key Section– ................................ 24
7. EXPLODED VIEWS
7-1. Main Section ................................................................... 29
7-2. Front Panel Section ......................................................... 30
7-3. CD Mechanism Section (MG-101TC-188//C) ............... 31
8. ELECTRICAL PARTS LIST ............................... 32
SECTION 1
SERVICE NOTE
EXTENSION CABLE AND SERVICE POSITION
When repairing or servicing this set, connect the jig (extension
cable) as shown below.
• Connect the MAIN board (CN350) and the SERVO board
(CN2) with the extension cable (Part No. J-2502-076-1).
MAIN BOARD
CN350
J-2502-076-1
SERVO BOARD
CN2
3
CDX-GT373A
NOTE FOR REPLACEMENT OF THE AUX JACK (J901)
To replace the AUX jack requires alignment.
1. Insert the AUX jack into the KEY board.
2. Place the KEY board on the front panel.
3. Solder the three terminals of the jack.
KEY board
AUX jack
NOTE FOR REPLACEMENT OF THE SERVO BOARD
When repairing, the complete SERVO board (A-1201-631-A)
should be replaced since any parts in the SERVO board cannot be
repaired.
NOTE FOR THE 15-PIN CONNECTOR (CN901)
Do not use alcohol to clean the 15-pin connector (CN901) connecting the front panel with the main body.
Do not touch the connector directly with your bare hand. Poor contact may be caused.
front panel
NOTE FOR REPLACEMENT OF THE FRONT PANEL
AND BUTTONS
When any of the following parts have been replaced, apply the
HANARL SFL-9A (Part No.7-400-000-00) to the specifi ed posi-
tion.
• P ANEL (SV) ASSY
• LA VEL (SEEK)
• BUTTON (SOURCE)
• BUTTON (MODE)
• LA VER (BASE)
• BUTTON (INNER)
please apply the HANARL SFL-9A
(Part No.7-400-000-00) to the
specified position.
4
798
qfq
qdq
q
0
• LOCATION OF CONTROLS
Location of controls and basic operations
Main unit
1
2
OFF
SOURCE
SEEK
SEEK
MODE
Card remote commander
RM-X151
1
OFF
2
qh
qj
qk
SOURCE
DSPL
132
465
SEL
+
–
+
VOL
–
6
ATT
MODE
SCRL
4653
T
C
E
L
E
S
H
S
U
P
REP SHUF
ALBUM
a
This section contains instructions on the location
of controls and basic operations.
For details, see the respective pages.
The corresponding buttons on the card remote
commander control the same functions as those
ql
on the unit.
w;
A OFF button
9
wa
ws
wd
To power off; stop the source.
B SOURCE button
To power on; change the source (Radio/CD/
AUX).
C Volume control dial/select
button page 8, 10
To adjust volume (rotate); select setup items
(press and rotate).
D Disc slot
Insert the disc (label side up), playback
starts.
E Display window
F Z (eject) button
To eject the disc.
G SEEK +/– control
CD:
To skip tracks (push up/down); skip tracks
continuously (push up/down, then push up/
down again within about 1 second and hold);
reverse/fast-f or w a rd a track (push up/down
and hold).
Radio:
To tune in stations automatically (push up/
down); find a station manually (push up/
down and hold).
H (front panel release) button page5
PAUSE SCRL
6123 54
EQ3 DSPL
s
CDX-GT373A
SECTION 2
GENERAL
I MODE button page 8
To se lect th e radio ba nd (F M/AM).
J RESET button (located behind the front
panel) page 4
K Number buttons
CD:
AUX
g
(1)/(2): ALBUM –/+ (during MP3/WMA
playback)
To skip albums (press ); skip albums
continuously (press and hold).
(3): REP page 8
(4): SHUF page 8
(6): PAUS E
To pause play back. To cancel, press
again.
Radio:
To receive stored stations (press); store
stations (press and hold).
L EQ3 (equalizer) button page10
To select an equalizer type (XPLOD,
VOCAL, EDGE, CRUISE, SPACE,
GRAVITY, CUSTOM or OFF).
M DSPL (display)/SCRL (scroll) button
page 8
To change display items (press); sc roll the
display item (press and hold).
N Receptor for the card remote
commander
O AUX input jack page 11
To connect a portable audio device.
This section is extracted
from instruction manual.
The following buttons on the card remote
commander have also differ ent buttons/functions
from the unit. Remove the insulation film before
use (page 4).
qh < (.)/, (>) buttons
To control CD/radio, the same as (SEEK)
+/– control on the unit.
Setup, sound setting, etc., can be oper ated b y
<,.
qj DSPL (display) button
To change display items.
qk VOL (volume) +/– button
To adjust volume.
ql ATT (attenuate) button
To attenuate the sound. To cancel, press
again.
w; SEL (select) button
The same as the select button on the uni t.
wa M (+)/m (–) buttons
To control CD, the same as (1)/(2)
(ALBUM –/+) on the unit.
Setup, sound setting, etc. , ca n be oper at ed b y
Mm.
ws SCRL (scroll) button
To scroll the display item.
wd Number buttons
To receive stored stations (press); store
s
tat
ions (press and hold).
Note
If the unit is turned off and the display disappears, it
cannot be operated with the card remote commander
unless (SOURCE) on the unit is pressed, or a disc is
inserted to activate the unit first.
7
• CONNECTIONS
A
AUDIO OUT FRONT
AUDIO OUT REAR*
* AUDIO OUT SUB/REAR
B
AUDIO OUT FRONT
Connection example
Notes
• Be sure to connect the ground (earth) lead before connecting
the amplifier.
• The alarm will only sound if the built-in amplifier is used.
Ejemplo de conexiones
Notas
• Asegúrese de conectar primero el cable de conexión a masa
antes de realizar la conexión del amplificador.
• La alarma sonará únicamente si se utiliza el amplificador
incorporado.
* AUDIO OUT SUB/REAR
AUDIO OUT REAR*
5
CDX-GT373A
from car antenna (aerial)
desde la antena del automóvil
1
*
1
*
AUDIO OUT
REAR
*
REAR FRONT
2
AUDIO OU T
Fuse (10 A)
Fusible (10 A)
AUDIO OUT
FRONT
L
R
1
*
RCA pin cord (not supplied)
2
*
AUDIO OUT can be switched SUB or REAR. For details,
see the supplied Operating Instructions.
1
*
Cable con terminales RCA (no suministrado)
2
*
AUDIO OUT (salida de audio) puede cambiarse a SUB
(altavoz potenciador de graves) o REAR (posterior). Para
obtener información, consulte el manual de instrucciones
suministrado.
3
Left
Izquierdo
Right
Derecho
Left
Izquierdo
Right
Derecho
Connection diagram
1 To a metal surface of the car
First connect the black ground (earth) lead, then connect the
yellow, and red power supply leads.
2 To the power antenna (aerial) control lead or
power supply lead of antenna (aerial) booster
amplifier
Notes
• It is not necessary to connect this lead if there is no power
antenna (aerial) or antenna (aerial) booster, or with a
manually-operated telescopic antenna (aerial).
• When your car has a built-in FM/AM antenna (aerial) in
the rear/side glass, see “Notes on the control and power
supply leads.”
3 To AMP REMOTE IN of an optional power
amplifier
This connection is only for amplifiers. Connecting any other
system may damage the unit.
4 To the +12 V power terminal which is
energized in the accessory position of the
ignition key switch
Notes
• If there is no accessory position, connect to the +12 V
power (battery) terminal which is energized at all times.
Be sure to connect the black ground (earth) lead to a
metal surface of the car first.
• When your car has a built-in FM/AM antenna (aerial) in
the rear/side glass, see “Notes on the control and power
supply leads.”
5 To the +12 V power terminal which is
energized at all times
Be sure to connect the black ground (earth) lead to a metal
surface of the car first.
Notes on the control and power supply leads
• The power antenna (aerial) control lead (blue) supplies +12 V
DC when you turn on the tuner.
• When your car has built-in FM/AM antenna (aerial) in the rear/
side glass, connect the power antenna (aerial) control lead
(blue) or the accessory power supply lead (red) to the power
terminal of the existing antenna (aerial) booster. For details,
consult your dealer.
• A power antenna (aerial) without a relay box cannot be used
with this unit.
Memory hold connection
When the yellow power input lead is connected, power will
always be supplied to the memory circuit even when the ignition
switch is turned off.
Notes on speaker connection
• Before connecting the speakers, turn the unit off.
• Use speakers with an impedance of 4 to 8 ohms, and with
adequate power handling capacities to avoid its damage.
• Do not connect the speaker terminals to the car chassis, or
connect the terminals of the right speakers with those of the
left speaker.
• Do not connect the ground (earth) lead of this unit to the
negative (–) terminal of the speaker.
• Do not attempt to connect the speakers in parallel.
• Connect only passive speakers. Connecting active speakers
(with built-in amplifiers) to the speaker terminals may damage
the unit.
• To avoid a malfunction, do not use the built-in speaker leads
installed in your car if the unit shares a common negative (–)
lead for the right and left speakers.
• Do not connect the unit’s speaker leads to each other.
Note on connection
If speaker and amplifier are not connected correctly, “FAILURE”
appears in the display. In this case, make sure the speaker and
amplifier are connected correctly.
Blue/white striped
AMP REM
Max. supply current 0.3 A
Corriente máx. de alimentación de 0,3 A
Con rayas azules y blancas
White
Blanco
White/black striped
Con rayas blancas y negras
Gray
Gris
Gray/black striped
Con rayas grises y negras
Green
Verde
Green/black striped
Con rayas verdes y negras
Purple
Morado
Purple/black striped
Con rayas moradas y negras
Diagrama de conexión
1 A una superficie metálica del automóvil
Conecte primero el cable de conexión a masa negro, y
después los cables amarillo y rojo de fuente de alimentación.
2 Al cable de control de la antena motorizada
o al cable de fuente de alimentación del
amplificador de señal de la antena
Notas
• Si no se dispone de antena motorizada ni de amplificador
de antena, o se utiliza una antena telescópica accionada
manualmente, no será necesario conectar este cable.
• Si el automóvil incorpora una antena de FM/AM en el
cristal trasero o lateral, consulte “Notas sobre los cables
de control y de fuente de alimentación”.
3 A AMP REMOTE IN de un amplificador de
potencia opcional
Esta conexión es sólo para amplificadores. La conexión de
cualquier otro sistema puede dañar la unidad.
4 Al terminal de alimentación de +12 V que
recibe energía en la posición de accesorio
del interruptor de encendido
Notas
• Si no hay posición de accesorio, conéctelo al terminal de
alimentación (batería) de +12 V que recibe energía sin
interrupción.
Asegúrese de conectar primero el cable de conexión a
masa negro a una superficie metálica del automóvil.
• Si el automóvil incorpora una antena de FM/AM en el
cristal trasero o lateral, consulte “Notas sobre los cables
de control y de fuente de alimentación”.
5 Al terminal de alimentación de +12 V que
recibe energía sin interrupción
Asegúrese de conectar primero el cable de conexión a masa
negro a una superficie metálica del automóvil.
Notas sobre los cables de control y de fuente de
alimentación
• El cable de control de la antena motorizada (azul) suministrará
cc de + 12 V cuando conecte la alimentación del sintonizador.
• Si el automóvil dispone de una antena de FM/AM incorporada
en el cristal trasero o lateral, conecte el cable de control de
antena motorizada (azul) o el cable de fuente de alimentación
auxiliar (rojo) al terminal de alimentación del amplificador de
antena existente. Para obtener más información, consulte a su
distribuidor.
• Con esta unidad no es posible utilizar una antena motorizada
sin caja de relé.
Conexión para protección de la memoria
Si conecta el cable de fuente de alimentación amarillo, el circuito
de la memoria recibirá siempre alimentación, aunque apague el
interruptor de encendido.
Notas sobre la conexión de los altavoces
• Antes de conectar los altavoces, desconecte la alimentación
de la unidad.
• Utilice altavoces con una impedancia de 4 a 8 Ω con la
capacidad de potencia adecuada para evitar que se dañen.
• No conecte los terminales de altavoz al chasis del automóvil,
ni conecte los terminales del altavoz derecho con los del
izquierdo.
• No conecte el cable de conexión a masa de esta unidad al
terminal negativo (–) del altavoz.
• No intente conectar los altavoces en paralelo.
• Conecte solamente altavoces pasivos. Si conecta altavoces
activos (con amplificadores incorporados) a los terminales de
altavoz, puede dañar la unidad.
• Para evitar fallas de funcionamiento, no utilice los cables de
altavoz incorporados instalados en el automóvil si la unidad
comparte un cable negativo común (–) para los altavoces
derecho e izquierdo.
• No conecte los cables de altavoz de la unidad entre sí.
Nota sobre la conexión
Si el altavoz no está conectado correctamente, aparecerá
“FAILURE” en la pantalla. Si es así, compruebe la conexión del
altavoz.
2
Black
Negro
Blue
Azul
Red
Rojo
Yellow
Amarillo
Max. supply current 0.1 A
Corriente máx. de alimentación de 0,1 A
ANT REM
1
2
4
5
6
DISASSEMBLY
• This set can be disassembled in the order shown below.
SET
CDX-GT373A
SECTION 3
3-1. SUB PANEL ASSY
(Page 7)
3-2. CD MECHANISM BLOCK
(Page 8)
3-3. MAIN BOARD
(Page 8)
3-4. MICROPHONE (MIC901)
(Page 9)
3-5. SERVO BOARD
(Page 9)
3-6. CHASSIS (T) SUB ASSY
(Page 10)
3-7. ROLLER ARM ASSY
(Page 10)
3-8. CHASSIS (OP) ASSY
(Page 11)
3-9. CHUCKING ARM SUB ASSY
(Page 11)
3-10. SLED MOTOR ASSY
(Page 12)
3-11. OPTICAL PICK-UP SECTION
(Page 13)
3-12. OPTICAL PICK-UP
(Page 13)
Note: Follow the disassembly procedure in the numerical order shown below.
3-1. SUB PANEL ASSY
two claws
two claws
two screws
(+PTT 2.6 × 6)
sub panel assy
7
CDX-GT373A
3-2. CD MECHANISM BLOCK
CD mechanism block
screw
(+PTT 2.6 × 6)
CN350
bracket (CD)
two screws
(+PTT 2.6 × 4)
screw
(+PTT 2.6 × 6)
3-3. MAIN BOARD
three ground point screws
(+PTT 2.6 × 6)
insulating sheet
two screws
(+PTT 2.6 × 8)
two screws
(+P 2.6 × 8)
two screws
(+PTT 2.6 × 10)
screw
(+P 2.6 × 10)
screw
(+PTT 2.6 × 10)
heat sink
MAIN board
8
3-4. MICROPHONE (MIC901)
CDX-GT373A
holder (LED) upper
claw
3-5. SERVO BOARD
CN200 (2P)
claw
screw
(+B P-tite M2)
microphone (MIC901)
MAIN board
WHT
RED
BLK
WHT
RED
BLK
RED
ORG
BLU
YEL
GRY
Remove the eleven solders.
SERVO board
claw
toothed lock screw
(M 1.7 × 2.5)
toothed lock screw
(M 1.7 × 2.5)
SERVO board
optical pick-up (16 core)
(CN1)
claw
9
CDX-GT373A
3-6. CHASSIS (T) SUB ASSY
two precision screws
(+P 1.7 × 2.2)
two precision screws
(+P 1.7 × 2.2)
chassis (T) sub assy
claw
3-7. ROLLER ARM ASSY
spring (RAL)
roller arm assy
gear (RA1)
washer
spring (RAR)
10
3-8. CHASSIS (OP) ASSY
tension spring (KF)
coil spring (damper) (natural)
CDX-GT373A
chassis (OP) assy
coil spring (damper) (green)
slider (R)
lever (D)
gear (LE1)
3-9. CHUCKING ARM SUB ASSY
spring
Note: Have this portion receive the chassis.
chucking arm sub assy
Note: Have this portion receive the chassis.
Note: Be careful not to touch the turn table.
11
CDX-GT373A
3-10. SLED MOTOR ASSY
turn table
three serration screws
(M 2 × 3)
sled motor assy
spring
spring
stand
Note:
Never remove these parts since they were adjusted.
stand
Note: Place the stand with care not to touch the turn table.
Note for Assembly
three serration screws
(M 2 × 3)
sled motor assy
Note: Take care to prevent the chassis from being bent
when tightening the three machine screws.
12
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