CDX-GT49UM/GT490U/ GT490US/GT494U
SERVICEMANUAL
E Model
CDX-GT490U/GT490US
Ver. 1.1 2009.11 |
Indian Model |
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CDX-GT49UM/GT494U |
Photo: CDX-GT490US
• The tuner and CD sections have no adjustments. |
Model Name Using Similar Mechanism |
CDX-GT33U |
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CD Drive Mechanism Type |
MG-101Y-188//Q |
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Optical Pick-up Name |
DAX-25A |
Tuner section FM
Tuning range:
Except Saudi Arabia model:
87.5 – 108.0 MHz (at 50 kHz step)
87.5 – 107.9 MHz (at 200 kHz step) Saudi Arabia model:
87.5 – 108.0 MHz
FM tuning interval:
Except Saudi Arabia model: 50 kHz/200 kHz switchable
Antenna (aerial) terminal:
External antenna (aerial) connector
Intermediate frequency: 150 kHz Usable sensitivity: 10 dBf Selectivity: 75 dB at 400 kHz Signal-to-noise ratio: 70 dB (mono) Separation: 40 dB at 1 kHz Frequency response: 20 – 15,000 Hz
AM
Tuning range:
Except Saudi Arabia model: 531 – 1,602 kHz (at 9 kHz step) 530 – 1,710 kHz (at 10 kHz step) Saudi Arabia model:
531 – 1,602 kHz
AM tuning interval:
Except Saudi Arabia model: 9 kHz/10 kHz switchable
Antenna (aerial) terminal:
External antenna (aerial) connector
Intermediate frequency: 25 kHz Sensitivity: 26 PV
SPECIFICATIONS
CD player section
Signal-to-noise ratio: 120 dB Frequency response: 10 – 20,000 Hz
Wow and fl utter: Below measurable limit
USB Player section
Interface: USB (Full-speed)
Maximum current: 500 mA
Power amplifi er section
Outputs: Speaker outputs (sure seal connectors)
Speaker impedance: 4 – 8 ohms
Maximum power output: 52 W u 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:
Remote controller input terminal Antenna (aerial) input terminal AUX input jack (stereo mini jack) USB signal input terminal
Tone controls:
Low: ±10 dB at 60 Hz (XPLOD)
Mid: ±10 dB at 1 kHz (XPLOD) High: ±10 dB at 10 kHz (XPLOD)
Power requirements: 12 V DC car battery (negative ground (earth))
Dimensions: Approx. 178 × 50 × 179 mm (7 1/8 × 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.
FM/AMCOMPACTDISCPLAYER
9-889-625-02 |
Sony Corporation |
2009K04-1 |
Audio&Video Business Group |
© 2009.11 |
Published by Sony Techno Create Corporation |
CDX-GT49UM/GT490U/GT490US/GT494U
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)
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.
CAUTION
Use of controls or adjustments or performance of procedures other than those specified 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
semi-fixed resistor
2
CDX-GT49UM/GT490U/GT490US/GT494U
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TABLE OF CONTENTS |
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1. |
SERVICE NOTE ...................................................... |
4 |
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2. |
GENERAL |
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This label is located on the bottom of the chassis. |
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Connections .................................................................... |
5 |
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3. |
DISASSEMBLY |
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UNLEADED SOLDER |
3-1. |
Sub Panel Assy ............................................................... |
9 |
Boards requiring use of unleaded solder are printed with the lead- |
3-2. |
CD Mechanism Block..................................................... |
9 |
free mark (LF) indicating the solder contains no lead. |
3-3. |
Main Board ..................................................................... |
10 |
(Caution: Some printed circuit boards may not come printed with |
3-4. |
Servo Board .................................................................... |
10 |
the lead free mark due to their particular size) |
3-5. |
Chassis (T) Sub Assy ...................................................... |
11 |
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3-6. |
Roller Arm Assy.............................................................. |
11 |
: LEAD FREE MARK |
3-7. |
Chassis (OP) Assy........................................................... |
12 |
Unleaded solder has the following characteristics. |
3-8. |
Chucking Arm Sub Assy................................................. |
12 |
• Unleaded solder melts at a temperature about 40 °C higher |
3-9. |
Sled Motor Assy.............................................................. |
13 |
than ordinary solder. |
3-10. |
Optical Pick-up Section .................................................. |
14 |
Ordinary soldering irons can be used but the iron tip has to be |
3-11. |
Optical Pick-up ............................................................... |
14 |
applied to the solder joint for a slightly longer time. |
4. |
DIAGRAMS |
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Soldering irons using a temperature regulator should be set to |
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about 350 °C. |
4-1. |
Block Diagram –Main Section– ..................................... |
15 |
Caution: The printed pattern (copper foil) may peel away if |
4-2. |
Block Diagram –Display Section– ................................. |
16 |
the heated tip is applied for too long, so be careful! |
4-3. |
Printed Wiring Board –Main Section– ............................ |
18 |
• Strong viscosity |
4-4. |
Schematic Diagram –Main Section (1/3)– ...................... |
19 |
Unleaded solder is more viscous (sticky, less prone to fl ow) |
4-5. |
Schematic Diagram –Main Section (2/3)– ...................... |
20 |
than ordinary solder so use caution not to let solder bridges |
4-6. |
Schematic Diagram –Main Section (3/3)– ...................... |
21 |
occur such as on IC pins, etc. |
4-7. |
Printed Wiring Boards –Key Section– ............................ |
22 |
• Usable with ordinary solder |
4-8. |
Schematic Diagram –Key Section– ................................ |
23 |
It is best to use only unleaded solder but unleaded solder may |
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also be added to ordinary solder. |
5. |
EXPLODED VIEWS |
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5-1. |
Main Section ................................................................... |
29 |
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5-2. |
Front Panel Section ......................................................... |
30 |
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5-3. |
CD Mechanism Section (MG-101Y-188//Q) .................. |
31 |
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6. |
ELECTRICAL PARTS LIST.................................. |
32 |
3
CDX-GT49UM/GT490U/GT490US/GT494U 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 (CN701) and the SERVO board (CN401) with the extension cable (Part No. J-2502-076-1).
MAIN BOARD
CN701
J-2502-076-1
SERVO BOARD
CN401
NOTE FOR REPLACEMENT OF THE USB CONNECTOR (CN902)
To replace the USB connector requires alignment.
1.Insert the USB connector into the front panel.
2.Place the KEY board on the front panel and align the terminals of the USB connector with the holes in the KEY board.
3.Solder the four terminals of the connector.
NOTE FOR REPLACEMENT OF THE SERVO BOARD
When repairing, the complete SERVO board (Part No. A-1555-002-A) should be replaced since any parts in the SERVO board cannot be repaired.
NOTE FOR THE 20-PIN CONNECTOR (CN901)
Do not use alcohol to clean the 20-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.
KEY board
USB (socket) connector
front panel
4
CDX-GT49UM/GT490U/GT490US/GT494U
SECTION 2 |
Ver. 1.1 |
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GENERAL |
This section is extracted |
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from instruction manual. |
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CONNECTIONS
• E, Indian, Mexican model
*1
*1 RCA pin cord (not supplied)
*2 AUDIO OUT can be switched SUB or REAR. For details, see the supplied Operating Instructions.
*3 Separate adaptor may be required.
*1 Cable con terminales RCA (no suministrado)
*2 AUDIO OUT (salida de audio) puede cambiarse a SUB o REAR. Para obtener información, consulte el manual de instrucciones suministrado.
*3 Puede requerirse un adaptador independiente.
*1
FRONT
AUDIO OUT
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L |
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from car antenna (aerial) |
R |
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REAR/SUB FRONT |
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desde la antena del automóvil |
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AUDIO OUT |
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REAR/SUB |
Fuse (10 A) |
REMOTE |
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AUDIO OUT*2 |
IN*3 |
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Fusible (10 A) |
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Blue/white striped |
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3 |
AMP REM |
Con rayas azules y blancas |
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Max. supply current 0.3 A |
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Corriente máx. de alimentación de 0,3 A |
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White |
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Blanco |
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Black |
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Left |
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Negro |
1 |
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Izquierdo |
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White/black striped
Con rayas blancas y negras
Gray |
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Gris |
Blue |
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Right |
Azul |
ANT REM |
Derecho |
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Max. supply current 0.1 A |
Gray/black striped |
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Corriente máx. de alimentación de 0,1 A |
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Con rayas grises y negras |
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Green |
Red |
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Verde |
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Rojo |
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Left |
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Izquierdo |
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Green/black striped |
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Con rayas verdes y negras |
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Purple |
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Morado |
Yellow |
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Right |
Amarillo |
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Derecho |
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Purple/black striped |
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Con rayas moradas y negras |
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2
4
5
Connection diagram |
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Diagrama de conexión |
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1 To a metal surface of the car |
1 |
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First connect the black ground (earth) lead, then connect the yellow, and red power supply leads.
2To the power antenna (aerial) control lead or power supply lead of antenna (aerial) booster
Notes
t 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).
t 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 
system may damage the unit.
4To the +12 V power terminal which is energized in the accessory position of the ignition key switch
Notes
t 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
tWhen your car has a built-in FM/AM antenna (aerial) in the rear/side glass, see “Notes on the control and power supply leads.”
5To the +12 V power terminal which is energized at all times
Be sure to connect the black ground (earth) lead to a metal
Notes on the control and power supply leads
t The power antenna (aerial) control lead (blue) supplies +12 V DC when you turn on the tuner.
t 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.
t 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
Notes on speaker connection
t
tUse speakers with an impedance of 4 to 8 ohms, and with adequate power handling capacities to avoid its damage.
tDo not connect the speaker terminals to the car chassis, or connect the terminals of the right speakers with those of the left speaker.
tDo not connect the ground (earth) lead of this unit to the negative
(–) terminal of the speaker.
tDo not attempt to connect the speakers in parallel.
tConnect only passive speakers. Connecting active speakers (with
tTo 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.
tDo not connect the unit’s speaker leads to each other.
Note on connection
appears in the display. In this case, make sure the speaker and
Conecte primero el cable de conexión a masa negro, y después los cables amarillo y rojo de fuente de alimentación.
2Al cable de control de la antena motorizada o al
de señal de la antena
Notas t
de antena, o se utiliza una antena telescópica accionada manualmente, no será necesario conectar este cable.
t 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
opcional
cualquier otro sistema puede dañar la unidad.
4Al terminal de alimentación de +12 V que recibe energía en la posición de accesorio del interruptor de encendido
Notas
t 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
tSi 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”.
5Al terminal de alimentación de +12 V que recibe energía sin interrupción
Asegúrese de conectar primero el cable de conexión a masa
Notas sobre los cables de control y de fuente de alimentación
tEl cable de control de la antena motorizada (azul) suministrará cc de + 12 V cuando conecte la alimentación del sintonizador.
tSi 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
existente. Para obtener más información, consulte a su distribuidor.
tCon 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
tAntes de conectar los altavoces, desconecte la alimentación de la unidad.
tUtilice altavoces con una impedancia de 4 a 8 : con la capacidad de potencia adecuada para evitar que se dañen.
tNo conecte los terminales de altavoz al chasis del automóvil, ni conecte los terminales del altavoz derecho con los del izquierdo.
tNo conecte el cable de conexión a masa de esta unidad al terminal negativo (–) del altavoz.
tNo intente conectar los altavoces en paralelo.
tConecte solamente altavoces pasivos. Si conecta altavoces activos puede dañar la unidad.
tPara 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.
tNo conecte los cables de altavoz de la unidad entre sí.
Nota sobre la conexión
aparecerá “FAILURE” en la pantalla. Si es así, compruebe la conexión de ambos dispositivos.
5
CDX-GT49UM/GT490U/GT490US/GT494U
• Argentina model
*2
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*2 |
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FRONT |
REMOTE |
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AUDIO OUT |
IN*4 |
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8 |
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L |
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R |
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REAR/SUB FRONT |
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AUD IO OUT |
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*1 from car antenna (aerial) |
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desde la antena del automóvil |
REAR/SUB |
Fuse (10 A) |
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Fusible (10 A) |
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AUDIO OUT *3 |
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2 |
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Blue/white striped |
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A |
AMP REM |
Con rayas azules y blancas |
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Max. supply current 0.3 A |
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Corriente máx. de alimentación de 0,3 A |
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*1 |
Note for the antenna (aerial) connecting |
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If your car antenna (aerial) is an ISO (International Organisation |
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for Standardisation) type, use the supplied adaptor 8 to connect |
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it. First connect the car antenna (aerial) to the supplied adaptor, |
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then connect it to the antenna (aerial) jack of the master unit. |
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*2 |
RCA pin cord (not supplied) |
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*3 |
AUDIO OUT can be switched SUB or REAR. For details, see the |
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supplied Operating Instructions. |
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*4 |
Separate adaptor may be required. |
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*1 |
Nota sobre la conexión de la antena |
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Si la antena del automóvil es del tipo ISO (International |
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Organization for Standardization), emplee el adaptador |
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See “Power connection diagram” on the reverse side |
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suministrado 8 para conectarla. En primer lugar, conecte la |
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for details. |
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antena del automóvil al adaptador suministrado y, a continuación, |
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*2 |
a la toma de antena de la unidad principal. |
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Para obtener más información, consulte el “Diagrama |
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Cable con terminales RCA (no suministrado) |
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de conexión de la alimentación” que encontrará al |
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*3 |
AUDIO OUT (salida de audio) puede cambiarse a SUB o REAR. |
dorso. |
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Para obtener información, consulte el manual de instrucciones |
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suministrado. |
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*4 |
Puede requerirse un adaptador independiente. |
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1 |
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+ |
Speaker, Rear, Right |
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Purple |
Altavoz, posterior, derecho |
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2 |
Morado |
– |
Speaker, Rear, Right |
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Altavoz, posterior, derecho |
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3 |
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+ |
Speaker, Front, Right |
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Gray |
Altavoz, frontal, derecho |
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4 |
Gris |
– |
Speaker, Front, Right |
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Altavoz, frontal, derecho |
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5 |
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+ |
Speaker, Front, Left |
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White |
Altavoz, frontal, izquierdo |
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6 |
Blanco |
– |
Speaker, Front, Left |
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Altavoz, frontal, izquierdo |
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Negative polarity positions 2, 4, 6, and 8 have striped leads.
Los cables de las posiciones de polaridad negativa 2, 4, 6 y 8 son rayados.
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1 |
3 |
5 |
7 |
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from the car’s speaker connector |
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desde un conector de altavoces del |
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automóvil |
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2 |
4 |
6 |
8 |
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5 |
7 |
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from the car’s power connector |
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desde un conector de alimentación |
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auxiliar del automóvil |
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4 |
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8 |
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4 |
Yellow |
continuous power supply |
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Amarillo |
fuente de alimentación continua |
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5 |
Blue |
power antenna (aerial) control |
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Azul |
control de la antena motorizada |
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7 |
Red |
switched power supply |
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Rojo |
fuente de alimentación conmutada |
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Positions 1, 2, 3 and 6 do not have pins.
Las posiciones 1, 2, 3 y 6 no tienen pines.
Connection diagram 
A 
system may damage the unit.
Warning
If you have a power antenna (aerial) without a relay box, connecting this unit with the supplied power connecting lead 2 may damage the antenna (aerial).
Notes on the control and power supply leads
tThe power antenna (aerial) control lead (blue) supplies +12 V DC when you turn on the tuner.
tWhen 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.
tA 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
Notes on speaker connection t
tUse speakers with an impedance of 4 to 8 ohms, and with adequate power handling capacities to avoid its damage.
tDo not connect the speaker terminals to the car chassis, or connect the terminals of the right speakers with those of the left speaker.
tDo not connect the ground (earth) lead of this unit to the negative
(–) terminal of the speaker.
tDo not attempt to connect the speakers in parallel.
tConnect only passive speakers. Connecting active speakers (with
tTo 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.
tDo not connect the unit’s speaker leads to each other.
Note on connection
appears in the display. In this case, make sure the speaker and
Diagrama de conexión 
A
opcional
cualquier otro sistema puede dañar la unidad.
Advertencia
Si la antena motorizada no dispone de caja de relé, es posible que la conexión de esta unidad mediante el cable de alimentación suministrado 2 provoque daños en la antena.
Notas sobre los cables de control y de fuente de alimentación
tEl cable de control de la antena motorizada (azul) suministrará cc de + 12 V cuando conecte la alimentación del sintonizador.
tSi 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
existente. Para obtener más información, consulte a su distribuidor.
tCon 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
tAntes de conectar los altavoces, desconecte la alimentación de la unidad.
tUtilice altavoces con una impedancia de 4 a 8 : con la capacidad de potencia adecuada para evitar que se dañen.
tNo conecte los terminales de altavoz al chasis del automóvil, ni conecte los terminales del altavoz derecho con los del izquierdo.
tNo conecte el cable de conexión a masa de esta unidad al terminal negativo (–) del altavoz.
tNo intente conectar los altavoces en paralelo.
tConecte solamente altavoces pasivos. Si conecta altavoces activos puede dañar la unidad.
tPara 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.
tNo conecte los cables de altavoz de la unidad entre sí.
Nota sobre la conexión
aparecerá “FAILURE” en la pantalla. Si es así, compruebe la conexión de ambos dispositivos.
6
CDX-GT49UM/GT490U/GT490US/GT494U
• Saudi Arabia model
Connection diagram
1To a metal surface of the car
First connect the black ground (earth) lead, then connect the yellow, and red power supply leads.
2To the power antenna (aerial) control lead or power supply lead of antenna (aerial) booster
Notes
t 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).
t 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
other system may damage the unit.
4To the +12 V power terminal which is energized in the accessory position of the ignition key switch
Notes
t 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
tWhen your car has a built-in FM/AM antenna (aerial) in the rear/side glass, see “Notes on the control
and power supply leads.”
5To the +12 V power terminal which is energized at all times
Be sure to connect the black ground (earth) lead to a
Notes on the control and power supply leads
tThe power antenna (aerial) control lead (blue) supplies +12 V DC when you turn on the tuner.
tWhen 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.
tA power antenna (aerial) without a relay box cannot be used with this unit.
Memory hold connection
When the yellow power supply lead is connected, power will always be supplied to the memory circuit even when the ignition switch is turned o .
Notes on speaker connection
tBefore connecting the speakers, turn the unit o .
tUse speakers with an impedance of 4 to 8 ohms, and with adequate power handling capacities to avoid its damage.
tDo not connect the speaker terminals to the car chassis, or connect the terminals of the right speakers with those of the left speaker.
tDo not connect the ground (earth) lead of this unit to the negative (–) terminal of the speaker.
tDo not attempt to connect the speakers in parallel.
tConnect only passive speakers. Connecting active terminals may damage the unit.
tTo 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.
tDo not connect the unit’s speaker leads to each other.
Note on connection
“FAILURE” appears in the display. In this case, make
7
CDX-GT49UM/GT490U/GT490US/GT494U SECTION 3
DISASSEMBLY
•This set can be disassembled in the order shown below.
SET
3-1. SUB PANEL ASSY (Page 9)
3-2. CD MECHANISM BLOCK (Page 9)
3-3. MAIN BOARD |
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3-4. |
SERVO BOARD |
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(Page 10) |
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3-5. |
CHASSIS (T) SUB ASSY |
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(Page 11) |
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3-6. |
ROLLER ARM ASSY |
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(Page 11) |
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3-7. |
CHASSIS (OP) ASSY |
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(Page 12) |
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3-8. |
CHUCKING ARM SUB ASSY |
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(Page 12) |
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3-9. |
SLED MOTOR ASSY |
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3-10. |
OPTICAL PICK-UP SECTION |
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3-11. |
OPTICAL PICK-UP |
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(Page 14) |
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8
CDX-GT49UM/GT490U/GT490US/GT494U
Note: Follow the disassembly procedure in the numerical order shown below.
3-1. SUB PANEL ASSY
3 two claws
2 two claws
1 two screws (+PTT 2.6 u 6)
4 sub panel assy
3-2. CD MECHANISM BLOCK
7 bracket (CD)
8 CD mechanism block
6 two screws (+PTT 2.6 u 4)
3
2 screw
(+PTT 2.6 u 6)
5 CN501 (3P)
4 CN701
1 screw
(+PTT 2.6 u 6)
9
CDX-GT49UM/GT490U/GT490US/GT494U
3-3. MAIN BOARD
2 two screws
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(+PTT 2.6 u 8) |
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4 two screws |
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(+P 2.6 u 8) 5 two screws |
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(+PTT 2.6 u 10) |
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1 three screws |
6 screw |
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(+BTT 2.6 u 5) |
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(+P 2.6 u 8) |
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7 screw |
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(+PTT 2.6 u 10) |
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8 heat sink |
9 MAIN board
3 |
insulating sheet |
3-4. SERVO BOARD
white red black
white red
black red orange
blue |
SERVO board |
yellow |
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gray |
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1 Remove the eleven solders.
5 claw
2toothed lock screw (M 1.7 u 2.5)
3 toothed lock screw (M 1.7 u 2.5)
7 SERVO board
6 optical pick-up (16 core) (CN101)
4 claw
10
CDX-GT49UM/GT490U/GT490US/GT494U
3-5. CHASSIS (T) SUB ASSY
2 two screws
1 two screws (M 1.7 u 2.5) (M 1.7 u 2.5)
4 chassis (T) sub assy
3 claw
3-6. ROLLER ARM ASSY
6 roller arm assy
5 |
4 gear (RA1) |
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1 spring (RAL) |
3 washer |
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2 spring (RAR) |
11
CDX-GT49UM/GT490U/GT490US/GT494U
3-7. CHASSIS (OP) ASSY
6 chassis (OP) assy
1 tension spring (KF)
5
7 two coil springs (damper) (natural)
8 coil spring (damper) (green)
4 slider (R)
3 lever (D)
2 gear (LE1)
3-8. CHUCKING ARM SUB ASSY
3 chucking arm sub assy
1 spring
2
Note: Have this portion receive the chassis.
Note: Have this portion receive the chassis.
Note: Be careful not to touch the turn table.
12
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