Sony CDXGT-272 Service manual

CDX-GT272

SERVICE MANUAL

Ver. 1.0 2008.02

• 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

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

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 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

/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 AUX cable Parts for installation and connections (1 set)

Design and speciﬁ cations are subject to change without notice.

CDX-GT170/GT170S/ GT270/GT270S

9-887-983-01

2008B04-1

2008.02

FM/AM COMPACT DISC PLAYER

Sony Corporation

Audio Business Group Published by Sony Techno Create Corporation

CDX-GT272

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), CD-R/CDRW (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.

CDX-GT272

1. SERVICE NOTE ..................................................... 3

2. GENERAL

Location of Controls ....................................................... 5

Connections .................................................................... 5

3. DISASSEMBLY

3-1. Sub Panel Assy ............................................................... 8

3-2. CD Mechanism Block ..................................................... 8

3-3. Main Board ..................................................................... 9

3-4. Servo Board .................................................................... 9

3-5. Chassis (T) Sub Assy ...................................................... 10

3-6. Roller Arm Assy .............................................................. 10

3-7. Chassis (OP) Assy ........................................................... 11

3-8. Chucking Arm Sub Assy ................................................. 11

3-9. Sled Motor Assy .............................................................. 12

3-10. Optical Pick-up Section .................................................. 13

3-11. Optical Pick-up ............................................................... 13

4. DIAGNOSIS FUNCTION ..................................... 14

5. DIAGRAMS

5-1. Block Diagram –Main Section– ..................................... 17

5-2. Block Diagram –Display Section– ................................. 18

5-3. Printed Wiring Board –Main Section– ............................ 19

5-4. Schematic Diagram –Main Section (1/4)– ...................... 20

5-5. Schematic Diagram –Main Section (2/4)– ...................... 21

5-6. Schematic Diagram –Main Section (3/4)– ...................... 22

5-7. Schematic Diagram –Main Section (4/4)– ...................... 23

5-8. Printed Wiring Boards –Key Section– ............................ 24

5-9. Schematic Diagram –Key Section– ................................ 25

6. EXPLODED VIEWS

6-1. Main Section ................................................................... 29

6-2. Front Panel Section ......................................................... 30

6-3. CD Mechanism Section (MG-101TC-188//C) ............... 31

7. 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 (CNP301) and the SERVO board (CN2) with the extension cable (Part No. J-2502-076-1).

MAIN BOARD CNP301

J-2502-076-1

SERVO BOARD CN2

CDX-GT272

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.

• LOCATION OF CONTROLS

798

qdq

qsq

Location of controls and basic operations

Main unit

OFF

SOURCE

SEEK

MODE

Card remote commander RM-X151

OFF

SOURCE

DSPL

132

465

SEL

–

VOL

–

ATT

MODE

SCRL

4653

REP SHUF

ALBUM

;

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

on the unit.

A OFF button

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, 9

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-forward 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

CDX-GT272

SECTION 2

GENERAL

I MODE button page 8

To se lect th e radio ba nd (F M/AM).

J Number buttons

CD:

(1)/(2): ALBUM –/+ (during MP3/WMA playback)

AUX

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).

K EQ3 (equalizer) button page9

To select an equalizer type (XPLOD, VOCAL, EDGE, CRUISE, SPACE, GRAVITY, CUSTOM or OFF).

L DSPL (display)/SCRL (scroll) button

page 8

To change display items (press); sc roll the display item (press and hold).

M Receptor for the card remote

commander

N AUX input jack page 10

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).

qg < (.)/, (>) buttons

To control CD/radio, the same as (SEEK) +/– control on the unit. Setup, sound setting, etc., can be oper ated b y <,.

qh DSPL (display) button

To change display items.

qj VOL (volume) +/– button

To adjust volume.

qk ATT (attenuate) button

To attenuate the sound. To cancel, press again.

ql SEL (select) button

The same as the select button on the uni t.

w; 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.

wa SCRL (scroll) button

To scroll the display item.

ws Number buttons

To receive stored stations (press); store stations (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.

• CONNECTIONS

AUDIO OUT FRONT

AUDIO OUT REAR*

* AUDIO OUT SUB/REAR

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*

CDX-GT272

from car antenna (aerial) desde la antena del automóvil

AUDIO OUT

REAR

REAR FRONT

AUDIO OU T

AUDIO OUT

FRONT

Fuse (10 A) Fusible (10 A)

RCA pin cord (not supplied)

AUDIO OUT can be switched SUB or REAR. For details,

see the supplied Operating Instructions.

Cable con terminales RCA (no suministrado)

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.

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.

Black Negro

Blue Azul

Red Rojo

Yellow Amarillo

Max. supply current 0.1 A Corriente máx. de alimentación de 0,1 A

ANT REM

DISASSEMBLY

• This set can be disassembled in the order shown below.

SET

3-1. SUB PANEL ASSY (Page 8)

3-2. CD MECHANISM BLOCK (Page 8)

CDX-GT272

SECTION 3

3-3. MAIN BOARD (Page 9)

3-4. SERVO BOARD (Page 9)

3-5. CHASSIS (T) SUB ASSY (Page 10)

3-6. ROLLER ARM ASSY (Page 10)

3-7. CHASSIS (OP) ASSY (Page 11)

3-8. CHUCKING ARM SUB ASSY (Page 11)

3-9. SLED MOTOR ASSY (Page 12)

3-10. OPTICAL PICK-UP SECTION (Page 13)

3-11. OPTICAL PICK-UP (Page 13)

CDX-GT272

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)

3-2. CD MECHANISM BLOCK

CD mechanism block

screw

(+PTT 2.6 × 6)

 sub panel assy

bracket (CD)

two screws

(+PTT 2.6 × 4)



CNP301

screw

(+PTT 2.6 × 6)

3-3. MAIN BOARD

three ground point screws (+PTT 2.6 × 6)

insulating sheet



CDX-GT272

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

3-4. SERVO BOARD

WHT

RED

BLK

WHT

RED

BLK

RED

ORG

BLU YEL

GRY

Remove the eleven solders.

toothed lock screw

(M 1.7 × 2.5)

toothed lock screw (M 1.7 × 2.5)

SERVO board

SERVO board

optical pick-up (16 core)

(CN1)

claw

CDX-GT272

3-5. 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

3-6. ROLLER ARM ASSY

spring (RAL)

roller arm assy

gear (RA1)

washer

spring (RAR)

3-7. CHASSIS (OP) ASSY



tension spring (KF)

coil spring (damper) (natural)

CDX-GT272

 chassis (OP) assy



coil spring (damper) (green)

slider (R)

lever (D)

gear (LE1)

3-8. 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.

CDX-GT272

3-9. SLED MOTOR ASSY

three serration screws (M 2 × 3)

turn table

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.

+ 26 hidden pages

Sony CDXGT-272 Service manual

TABLE OF CONTENTS

GENERAL

DISASSEMBLY

CD mechanism block

 sub panel assy

MAIN board

SERVO board

chassis (T) sub assy

roller arm assy

 chassis (OP) assy

chucking arm sub assy

sled motor assy