Sony CDX-757-MX Service manual

CDX-757MX

SERVICE MANUAL

Ver 1.1 2002.08

SPECIFICATIONS

US Model

Canadian Model

E Model

Model Name Using Similar Mechanism CDX-747X CD Drive Mechanism Type MG-251B-137 Optical Pick-up Name KSS-720A

System Compact disc digital audio system Laser diode properties Material: GaAlAs

This output is the value measured at a distance of 200 mm from the objective lens surface on the Optical Pick-up Block.

Frequency response 5 – 20,000 Hz Wow and flutter Below the measurable limit Signal-to-noise ratio 102 dB Outputs BUS control output (8 pins)

Current drain 800 mA (during CD playback)

Operating temperature –10°C to +55°C (14°F to 131°F) Dimensions Approx. 262 × 90 × 185 mm

Mass Approx. 2.1 kg (4 lb. 10 oz.) Power requirement 12 V DC car battery

Supplied accessories Disc magazine (1)

Design and specifications are subject to change without notice.

Wavelength: 780 nm Emission Duration: Continuous Laser out-put Power: Less than

44.6 µW*

Analog audio output (RCA pin)

800 mA (during loading or ejecting a disc)

(10

/8 × 3 5/8 × 7 3/8 in.)

(w/h/d) not incl. projecting parts and controls

(negative ground)

Parts for installation and connections (1 set)

9-873-618-02 Sony Corporation

2002H0500-1 e Vehicle Company C 2002.08 Published by Sony Engineering Corporation

COMPACT DISC CHANGER

CDX-757MX

SERVICING NOTES

NOTES ON HANDLING THE OPTICAL PICKUP BLOCK OR BASE UNIT

The laser diode in the optical pick-up block may suffer electrostatic breakdown because of the potential difference generated by the charged electrostatic load, etc. on clothing and the human body . During repair, pay attention to electrostatic breakdown and also use the procedure in the printed matter which is included in the repair parts. The flexible 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 reflective surface by the objective lens in the optical pick-up block. Therefore, when checking the laser diode emission, observe from more than 30 cm away from the objectiv e lens.

US/Canadian model:

If the optical pick-up block is defective, please replace the whole optical pick-up block. Never turn the semi-fixed resistor located at the side of optical pick-up block.

OPTICA PICK-UP BLOCK

DISC MAGAZINE GETTING OUT PROCEDURE ON THE POWER SUPPLY IS OFF

Remove the CASE (LOWER. T) beforehand

1) Press the lever (ML.S) assy in the direction of arrow A.

2) Removal the magazine assy.

Note: Take out the magazine only when the tray is completely within the

magazine. If the disk or tray is sticking out, turn on the power and eject the magazine.

Lever (ML.S)

Magazine assy

SEMI-FIXED RESISTOR

CAUTION

Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.

Flexible Circuit Board Repairing

•Keep the temperature of the soldering iron around 270 ˚C during repairing.

• Do not touch the soldering iron on the same conductor of the circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering or unsoldering.

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.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0 ON THE SCHEMATIC DIA GRAMS 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.

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!

LES COMPOSANTS IDENTIFIÉS P AR UNE MARQUE 0 SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

CDX-757MX

TEST DISC

This set can playback a CD-R, CD-RW for audio use. When test this set, use the following test disc. Test disc for CD-R: TCD-R082LMT (Part No.: J-2502-063-1) Test disc for CD-RW: TCD-W082L (Part No.: J-2502-063-2)

Notes on CD-R/CD-RW discs

•

You can play CD-Rs/CD-RWs (recordable CDs/rewritable CDs) on this unit (fig. E).

•

Some CD-Rs/CD-RWs (depending on the equipment used for its recording or the condition of the disc) may not play on this unit.

•

You cannot play a CD-R/CD-RW that is not finalized*.

•

A CD-R/CD-RW to which a session can be added can be played.

A process necessary for a recorded CD-R/CD-RW disc to be played on the audio CD player.

Audio CD

MP3 files

About MP3 files

Folder (album)

MP3 file (track)

Tree 1 Tree 2 Tree 3 Tree 4 Tree 5 (root)

MP3 (MPEG 1 Audio Layer-3) is a standard technology and format for compressing a sound sequence. The file is compressed to about 1/10 of its original size. Sounds outside the range of human hearing are compressed while the sounds we can hear are not compressed.

Notes on discs

You can play MP3 files recorded on CD-ROMs, CD-Rs (recordable CDs), and CD-RWs (rewritable CDs). The disc must be in the ISO 9660* level 2 format, or Joliet or Romeo in the expansion format. You can use a disc recorded in Multi Session*

*1ISO 9660 Format

The most common international standard for the logical format of files and folders on a CD-ROM. There are several specification levels. In Level 1, file names must be in the 8.3 format (no more than eight characters in the name, no more than three characters in the extension “.MP3”) and in capital letters. Folder names can be no longer than eight characters. There can be no more than eight nested folder levels. In level 2, file names can be up to 31 characters long (including the delimiter, the dot “.”, and the extension “. MP3”). Each folder can have up to 8 trees. For Joliet or Romeo in the expansion format, make sure of the contents of the writing software, etc.

*2Multi Session

This is a recording method that enables adding of data using the TrackAt-Once method. Conventional CDs begin at a CD control area called the Lead-in and end at an area called Lead-out. A Multi Session CD is a CD having multiple sessions, with each segment from Lead-in to Leadout regarded as a single session. CD-Extra: A format that contains audio tracks (audio CD data) in

Session 1, and a data track in Session 2.

Mixed CD: A format that contains a data track and audio tracks (audio

Notes

• If MP3 files and Audio data are mixed in a disc, the first identified

• With formats other than ISO 9660 level 1, folder names or file

• When naming, be sure to add the file extension “.MP3” to the file

• If you put the extension “.MP3” to a file other than MP3, the unit

The playback order of the MP3 files

The playback order of the folders and files is shown in the illustration above.

Notes

•A folder that does not include an MP3 file is skipped.

•If you playback an MP3 file before the information on all the CDs

• The unit reads the disc information (the number of folders and

•When a disc magazine is inserted into the CD changer or the reset

• The following discs take a longer time to start playback.

• Depending on the condition of the disc, it may not play back. For

•Maximum folder number in a disc: 255

•Maximum file number in a disc: 511

Cautions when playing a disc that is recorded in Multi Session

• When the first track of the first session is audio CD data: Non-music data

• When the first track of the first session is not audio CD data:

Note on character codes

Character codes vary depending on the master unit. For details, refer to the operating instructions for the master unit.

Note on display of playing time

In the following cases, elapsed playing time may not be displayed accurately. – when an MP3 file of VBR (variable bit rate) is played. – during fast-forward/reverse.

Tip

• To specify a desired playback order, before the folder or file

•A disc/album/track name or track number that is over 99 may not

CD data) in a session.

file or data will be played back. names may not be displayed correctly. name. cannot recognize the file properly and will generate random noise

that could damage your speakers.

in the disc magazine has been read, and then set the ignition to OFF or select another source, the beginning of the current track may play back when you resume playback.

files, or the location of the data) before playback of an MP3 file. It may take more time to start playback of a disc with a complex file structure.

button of the connected car audio is pressed, the unit will automatically be activated and read the information on the CDs. When the information on all the CDs in the disc magazine has been read, the unit will automatically stop operation. The unit firstly reads all of the disc information in the disc magazine. Depending on the recording method, it may take some time to stop the operation even if you set the ignition key to OFF during disc reading. This is not a malfunction.

–a disc recorded with complicated tree structure. –a disc recorded in Multi Session. –a disc to which data can be added. We recommend that you make only one or two trees for each disc.

details, please refer to “Notes on discs.” empty folders)

* Maximum number of files and folders: 512

When a file/folder name contains many characters, this number may become less than 512.

information (track number, time, etc.) is displayed with no sound.

– Audio CD data is played back normally; other data is played back with

no sound. (MP3 file(s) cannot be played back.)

– If no MP3 file is in the disc, “NO Music” is displayed and nothing is

played back. (Audio CD data is not recognized.)

name, input the order by number (e.g., “01,” “02”), then record contents onto a disc. (The order differs depending on the writing software.)

be displayed accurately when this unit is connected to a master unit that does not support MP3. A master unit that supports MP3 is recommended.

About ID3 tag version 2

Although not a malfunction, the following occurs when an MP3 file containing ID3 tag ver.2 is played: – When skipping a portion of ID3 tag ver.2 (at the

beginning of the track), sound is not output. Skip time changes depending ID3 tag ver.2 capacity. Example: At 64 kbytes, it is about 2 seconds (with RealJukebox).

– The displayed elapsed playing time when skipping a

portion of ID3 tag ver.2 is inaccurate. For MP3 files of a bit rate other than 128 kbps, time is not displayed accurately during playback.

– When an MP3 file is created with MP3 conversion

software (ex. RealJukebox*), ID3 tag ver.2 will automatically be written. * “RealJukebox is a registered trademark of

RealNetworks, Inc.”

As of December, 2001

(including root folder and

level 1 or

CDX-757MX

FAQ- about MP3 Audio File

Q1 What is MP3?

MP3 (MPEG Audio Layer3) is a standard for compressing audio parts of Moving Pictures Experts Group (MPEG). The special feature of MP3 is that the music data is compressed to about 1/10 of its original size while retaining the same sound quality as a CD or an MD. Compared with an audio disc (maximum 74 minutes running time), MP3 lets you compress about 10 audio discs or 160 fourminute songs into a CD-R/RW of 650MB.

Note

Recorded music is limited to private use only. Use of music beyond this limit requires the permission of the copyright holders. Copyright law prohibits copying, distributing, or delivering all or part of the contents.

Q2 What kind of MP3 files can be

played back?

MP3 files in CD-ROMs, CD-Rs, and CDRWs can be played. Pay attention to the following points when creating MP3 data CDs using your computer, CD-R/RW drive, writing software, or MP3 file.

• The file must be in the ISO 9660 level 1 or level 2 format, or Joliet or Romeo in the ISO 9660 expansion format. A folder name or a file name with the format other than ISO 9660 level 1 may not be displayed correctly. When creating MP3 data CDs, the format of ISO 9660 level 1 is recommended.

• When naming, be sure to add the file extension “.MP3” to the MP3 file name. The unit cannot recognize an MP3 file without the extension “.MP3,” or a file that is not MP3 format, even with the extension “.MP3.”

Q3 Is there maximum number of

folders or files to play?

Pay attention to the maximum numbers mentioned below.

•Maximum folder number in a disc: 255* (including root folder and empty folders)

•Maximum file number in a disc: 511* * Maximum number of files and folders:

512 When a file/folder name contains many characters, this number may become less than 512.

• The maximum number of trees which can be played is 8.

The unit allows you to change the folders, to play just the files in your favorite folder repeatedly, or to play files randomly, create folders according to artist name or album, and put related MP3 files into folders to use the unit as a CD changer.

ROOT

01_ ALBUM

02_ ALBUM

10_ ALBUM

: Folder

: MP3 file

001TRACK.MP3 002TRACK.MP3

...

010TRACK.MP3

011TRACK.MP3

...

020TRACK.MP3

091TRACK.MP3

...

100TRACK.MP3

Q4 Can the unit play a data CD with

folder levels?

The unit can play a data CD with folder levels.

Q5 Is there any restriction about the

bit rate regarding playback of MP3 files?

There is no specific restriction, but a bit rate of more than 128kbps is recommended from the perspective of sound quality. The unit also supports VBR (Variable Bit Rate).

Note

Elapsed playing time may not be displayed accurately during cue/reverse.

Q6 Does the unit support a disk of

80 minutes running time (700 MB data capacity)?

The unit supports a disk of 80 minutes running time (700 MB data capacity).

Q7 Can the unit play a CD-R/RW

containing both music CD data (CD-DA) and MP3 file data?

The first identified file or data will be played back.

Q8 Can the unit play a disc to which

data can be added (non-finalized disc)?

The unit can play a non-finalized disc.

Q9 Can the unit play a Multi Session

disc?

The unit can play a Multi Session disc. For details, refer to the operating instructions.

Q10 Does the unit support Emphasis?

The unit does not support Emphasis.

Q11 What is the sampling rate

supporting the unit?

The unit is supported from 16kHz to 48kHZ.

MPEG1 48kHz 44.1kHz 32kHz

MPEG2 24kHz 22.05kHz 16kHz

Q12 Does the unit support the play

list of m3u?

The unit does not support the play list of m3u.

Q13 Does the unit support ID3-Tag?

The unit supports ID3 tag ver.1. Pay attention to the following points about ID3 tag ver.2.

About ID3 tag version 2

Although not a malfunction, the following occurs when an MP3 file containing ID3 tag ver.2 is played: –When skipping a portion of ID3 tag ver.2 (at the

beginning of the track), sound is not output. Skip time changes depending ID3 tag ver.2 capacity. Example: At 64 kbytes, it is about 2 seconds (with RealJukebox).

– The displayed elapsed playing time when skipping

a portion of ID3 tag ver.2 is inaccurate. For MP3 files of a bit rate other than 128 kbps, time is not displayed accurately during playback.

– When an MP3 file is created with MP3 conversion

software (ex. RealJukebox*), ID3 tag ver.2 will automatically be written. * “RealJukebox is a registered trademark of

RealNetworks, Inc.”

As of December, 2001

Q14 Is a file name/a folder name of

MP3 different from the name when creating a data CD (the name displayed on your computer)?

On this unit, a file name/a folder name is displayed as below.

•A file name/a folder name can be displayed up to 8 characters.

or later character cannot be

A 9 displayed or scrolled.

•A folder name or a file name in a format other than ISO 9660 level 1 may not be displayed correctly. The file name should only use one byte uppercase, one byte numeric characters, or an underscore (“__”). It should also be no more than 8 characters long, and with no more than three characters in the extension.

• Japanese phonetic symbols/ Chinese characters cannot be displayed. Only one byte uppercase (A-Z), one byte numeric character (0-9), and one byte

“_”, “.”,

symbol ( can be displayed. One byte lowercase (az) is changed to an uppercase character, and any other characters are displayed as “*”.

“<”, “>”, “/”, “+”, “*”)

Q15 MP3 files recorded onto a CD-R/

RW cannot be played.

This may happen in following cases.

• The recording method onto CD-R/RW is the packet write method.

• The extension file is not an “.MP3.”

• The file data is not MP3 format.

• Some recording condition (omission of data, etc.) or some disc condition (dirt, crack, curving, etc.) may cause inability to playback an MP3 file.

Q16 It takes some time to start

playback of MP3 file.

The unit reads the disc information (the number of folders and files, or the location of the data) before playback of MP3 file. It may take more time to start playback of a disc with many trees. Please refer to the instruction manual for details.

Q17 Playback skipping and no

playback occur.

Recording condition onto CD-R/RW (omission of data, etc.) or disc condition (dirt, crack, curving, etc.) may cause playback skipping or no playback.

Q18 Can WAVE files be played back

on this unit?

WAVE files cannot be played back on this unit.

Q19 Can other compressed formats,

such as ATRAC3, be played back on the unit?

Only MP3 can be played back on the unit.

SERVICING NOTES .......................................................... 2

1. GENERAL

Installation....................................................................... 6

Connections..................................................................... 7

2. DISASSEMBLY

2-1. Disassembly Flow ........................................................... 8

2-2. Case (Upper. T), Front Panel Assy ................................. 9

2-3. Mechanism Deck (MG-251B-137)................................. 9

2-4. JACK Board .................................................................... 10

2-5. MAIN Board, Slide Variable Resistor

(Elevator Height Sensor) (RV202) ................................. 10

2-6. ELJ Motor Assy (Elevator) (M104) ................................ 11

2-7. Escutcheon (T) ................................................................ 11

2-8. Chassis (U.S) Sub Assy .................................................. 12

2-9. Chassis Assy.................................................................... 12

2-10. RF Board ......................................................................... 13

2-11. Sled Motor Assy (251) (M101),

Optical Pick-up (KSS-720A) .......................................... 13

2-12. LSW Board, Spindle Motor (S) Sub Assy (M102) ........ 14

2-13. ELJ Motor Assy (Chucking) (M103) ............................. 14

CDX-757MX

3. ASSEMBLY

3-1. Assembly Flow................................................................ 15

3-2. Optical Pick-up Complete Assy...................................... 15

3-3. Gear (Lomini)/(Load 1) Assy ......................................... 16

3-4. Operation Check ............................................................. 16

4. MECHANICAL ADJUSTMENT .......................... 17

5. ELECTRICAL CHECK .......................................... 18

6. DIAGRAMS

6-1. Block Diagram – SERVO Section – .............................. 20

6-2. Block Diagram – MAIN Section (1/2) – ....................... 21

6-3. Block Diagram – MAIN Section (2/2) – ....................... 22

6-4. Note for Printed Wiring Boards and

Schematic Diagrams ....................................................... 23

6-5. Printed Wiring Boards – RF/LSW Boards – ................. 24

6-6. Schematic Diagram – RF/LSW Boards –...................... 25

6-7. Printed Wiring Boards

– MAIN Board (Component Side) – .............................. 26

6-8. Printed Wiring Boards

– MAIN (Conductor Side)/SWITCH Boards –.............. 27

6-9. Schematic Diagram – MAIN Board (1/3) – .................. 28

6-10. Schematic Diagram

– MAIN (2/3)/SWITCH Boards – .................................. 29

6-11. Schematic Diagram – MAIN Board (3/3) – .................. 30

6-12. Printed Wiring Boards – JACK Board –........................ 32

6-13. Schematic Diagram – JACK Board – ............................. 33

6-14. IC Pin Function Description ........................................... 39

7. EXPLODED VIEWS

7-1. Case Section .................................................................... 41

7-2. Mechanism Deck Section-1 (MG-251B-137) ................ 42

7-3. Mechanism Deck Section-2 (MG-251B-137) ................ 43

7-4. Mechanism Deck Section-3 (MG-251B-137) ................ 44

7-5. Mechanism Deck Section-4 (MG-251B-137) ................ 45

8. ELECTRICAL PARTS LIST ............................... 46

CDX-757MX

SECTION 1

GENERAL

This section is extracted from instruction manual.

InstallationInstallation

Precautions

• Choose the mounting location carefully, observing the following: — The unit is not subject to temperatures exceeding 55°C (131°F)

(such as in a car parked in direct sunlight). — The unit is not subject to direct sunlight. — The unit is not near heat sources (such as heaters). — The unit is not exposed to rain or moisture. — The unit is not exposed to excessive dust or dirt. — The unit is not subject to excessive vibration. — The fuel tank should not be damaged by the tapping screws. — There should be no wire harnesses or pipes under the place

where you are going to install the unit. — The spare tire, tools or other equipment in or under the trunk

should not be interfered with or damaged by the screws or the

unit itself.

• Be sure to use only the supplied mounting hardware for a safe and secure installation.

• Use only the supplied screws.

• Make holes of ¿ 3.5 mm (

nothing on the other side of the mounting surface.

How to install the unit

The brackets 1 provide two positions for mounting, high and low. Use the appropriate screw holes according to your preference.

/32 in.) only after making sure there is

Horizontal installation

HORIZONTAL

Précautions

• Choisir l’emplacement de montage en tenant compte des observations suivantes : — Appareil non soumis à des températures dépassant 55°C (131°F)

(comme dans une voiture garée au soleil). — Appareil non soumis au rayonnement solaire direct. — Appareil à l’écart de sources de chaleur (comme des radiateurs). — Appareil non exposé à la pluie ou à l’humidité. — Appareil non exposé à des poussières ou à des souillures en

excès. — Appareil non exposé à des vibrations excessives. — Vérifier que le réservoir d’essence ne risque pas d’être

endommagé par les vis taraudeuses. — Il ne doit pas y avoir de faisceau de fils ou de tuyaux à

l’emplacement du montage. — Vérifier que l’appareil ou les vis ne risquent pas d’endommager

ou de gêner la roue de secours, les outils, ou autre objet dans le

coffre.

• Pour garantir la sécurité de l’installation, utiliser uniquement le matériel de montage fourni.

• Utilisez uniquement les vis fournies.

• Ne percez les trous de 3,5 mm (

qu'il n'y avait rien de l'autre côté de la surface de montage.

Installation de l’appareil

Les supports 1 offrent deux positions de montage, haut et bas. Utilisez les trous de vissage appropriés en fonction de vos préférences.

/32 po.)¿ qu'après vous être assuré

Installation horizontale

Align with the marked position. Aligner sur le repère.

Unit: mm (in.) Unité : mm (po.)

/32)

¿ 3.5 (

Vertical installation Installation verticale

Align with the marked position.

VERTICAL

Aligner sur le repère.

Suspended installation

When the unit is to be installed under the rear tray etc. in the trunk compartment, make sure the following provisions are made.

• Choose the mounting location carefully so that the unit can be installed horizontally.

• Make sure the unit does not hinder the movement of the torsion bar spring etc. of the trunk lid.

¿ 3.5 (5/32)

Unit: mm (in.) Unité : mm (po.) Unidad: mm

Inclined installation

After installing the unit, align the dials with one of the marks so that the arrows are as vertical as possible.

Installation suspendue

Si l’appareil doit être installé sous la plage arrière dans le coffre, par exemple, observer les précautions suivantes.

• Bien choisir l’emplacement pour pouvoir installer l’appareil à l’horizontale.

• Vérifier que l’appareil ne gêne pas les mouvements du ressort de fermeture du coffre, entre autres.

Align with the marked position.

HORIZONTAL

Aligner sur le repère. Alinee en la posición marcada.

Installation inclinée

Après avoir installé l’appareil, alignez les disques sur un repère de façon à ce que les flèches soient dans la position la plus verticale possible.

Unit: mm (in.) Unité : mm (po.)

¿ 3.5 (5/32)

V ER

T I CA

TA N ZO I R HO

Note

Be sure to align the left and right dials with the same mark.

A T N

O Z

I R O

E R T

I C A L

Remarque

Veillez à aligner les disques gauche et droite sur le même repère.

A T N

Z I R

E R T I C A L

Connections/Connexions

CDX-757MX

Connection diagram/Schéma de connexion

Sony BUS compatible car audio Autoradio compatible BUS Sony

BUS AUDIO IN BUS CONTROL IN

CDX-757MX

Inserting a disc/Insertion d’un disque

With the arrow side facing up Avec la partie fléchée tournée vers le haut

Tab Onglet

Labeled surface up Etiquette vers le haut

10 discs, one in each tray 10 disques, un par plateau

For details, refer to the Installation/Connections manual of the car audio. Pour plus de détails, consulter le manuel d’installation/connexions de

l’autoradio.

Note

For connecting two or more changers, the XA-C30 source selector (optional) is necessary.

Remarque

Pour raccorder deux ou plusieurs changeurs, le sélecteur de source XA-C30 (en option) est nécessaire.

Note

You cannot play 8cm (3 in.) CDs.

Remarque

Vous ne pouvez pas écouter de CD de 8 cm (3po.) sur ce lecteur.

Use the supplied disc magazine or the disc magazine XA-250.The disc magazine XA-10B/XA350 can not be used with this unit.If you use any other magazine,it may cause a malfunction.

Utilisez le magasin à disques fourni ou un magasin à disques XA-250. Vous ne pouvez pas utiliser de magasin à disques XA-10B/XA-350 avec cet appareil. L'utilisation d'un autre type de magasin à disques risque de provoquer un dysfonctionnement.

Push to unlock the door Poussez pour déverrouiller la porte

Disc magazine Chargeur de disques

Notes on the disc magazine

•Do not leave the disc magazine in locations with high temperatures and high humidity such as on a car dashboard or in the rear window where the disc magazine will be subjected to direct sunlight.

•Do not place more than one disc at a time onto one tray, otherwise the changer and the discs may be damaged.

•Do not drop the disc magazine or subject it to a violent shock.

When the tray comes out

Normally, the trays will not come out of the magazine. However, if they are pulled out of the magazine, it is easy to re-insert them.

Lorsque le plateau sort

En principe, les plateaux ne sortent pas du chargeur. Toutefois, s’ils sortent du chargeur, il est facile de les réinsérer.

To remove Retrait

Use the unit with the door closed completely

Otherwise, foreign matter may enter the unit and contaminate the lenses inside the changer.

Utilisez cet appareil avec la fenêtre complètement fermée

Sinon, des corps étrangers pourraient pénétrer dans l’appareil et encrasser les lentilles dans le lecteur.

Slide open Coulissez pour ouvrir

Z (EJECT)

Remarques sur le chargeur de disques

•Ne pas laisser le chargeur de disques dans un endroit très chaud ou très humide comme sur le tableau de bord ou sur la plage arrière de la voiture où il serait en plein soleil.

•Ne pas insérer plus d’un disque à la fois sur le plateau, sinon le changeur et les disques risquent d’être endommagés.

•Ne pas laisser tomber le chargeur de disques ni le cogner.

Note

To prevent injury, do not insert your hand in the CD changer.

Remarque

Pour éviter toute blessure, ne pas introduire la main dans le changeur de CD.

If the disc magazine does not lock properly

Take out the magazine, and after pressing the Z (EJECT) button, re-insert it.

Si vous ne pouvez pas fermer le chargeur de disques

Sortez le chargeur et, après avoir appuyé sur la touche Z (EJECT), réinsérez-le.

Note

When a disc magazine is inserted into the CD changer or the reset button of the connected car audio is pressed, the unit will automatically be activated and read the information on the CDs. When the information on all the CDs in the disc magazine has been read, the unit will automatically stop operation. The unit firstly reads all of the disc information in the disc magazine. Depending on the recording method, it may take some time to stop the operation even if you set the ignition key to OFF during disc reading. This is not a malfunction.

Remarque

Quand un chargeur de disques est inséré dans le changeur de CD ou si la touche de réinitialisation de l’autoradio raccordé est enclenchée, l’appareil se met automatiquement en marche et reproduit les CD. Lorsque tous les CD du chargeur ont été reproduits, l’appareil s’arrête automatiqement. L’appareil commence par lire toutes les informations relatives au disque dans le chargeur de disque. Selon la méthode d’enregistrement, l’arrêt de l’opération peut demander quelques instants avant de s’arrêter si vous tournez la clé de contact sur OFF au cours de la lecture du disque. Il ne s’agit pas d’un dysfonctionnement.

With the cut-away portion of the tray facing you, insert the right corner of the tray in the slot, then push in the left corner until it clicks.

Note

Do not insert the tray upside down or in the wrong direction.

Avec la portion découpée du plateau vous faisant face, insérer le coin droit du plateau dans la fente, puis enfoncer le coin gauche jusqu’au déclic.

Remarque

Ne pas insérer le plateau à l’envers ou dans le mauvais sens.

CDX-757MX

SECTION 2

DISASSEMBLY

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

2-1. DISASSEMBLY FLOW

Note 1: The process described in can be performed in any order. Note 2: Without completing the process described in , the next process can not be performed.

SET

2-2. CASE (UPPER.T),

FRONT PANEL ASSY (Page 9)

2-3. MECHANISM DECK

(MG-251B-137) (Page 9)

2-4. JACK BOARD

(Page 10)

2-5. MAIN BOARD,

SLIDE VARIABLE RESISTOR (ELEVATOR HEIGHT SENSOR) (RV202) (Page 10)

2-6. ELJ MOTOR ASSY

(ELEVATOR) (M104) (Page 11)

2-9. CHASSIS ASSY

2-10. RF BOARD

2-11. SLED MOTOR ASSY (251) (M101),

2-12. LSW BOARD,

2-7. ESCUTCHEON (T)

(Page 11)

2-8. CHASSIS (U.S) SUB ASSY

(Page 12)

(Page 13)

OPTICAL PICK-UP (KSS-720A) (Page 13)

SPINDLE MOTOR (S) SUB ASSY (M102) (Page 14)

2-13. ELJ MOTOR ASSY (CHUCKING) (M103)

(Page 14)

Note: Follow the disassembly procedure in the numerical order given.

screw (PTT2.6

lever (FLT. 838)

screw (PTT2.6 × 6)

screw (PTT2.6

front panel assy

lever (FLT. 838)

case (upper. T)

)

2-2. CASE (UPPER. T), FRONT PANEL ASSY

CDX-757MX

2-3. MECHANISM DECK (MG-251B-137)

tension coil spring (FL)

two dampers (T)

filament tape

jack flexible board (CNJ901)

mechanism deck (MG-251B-137)

tension coil spring (FL

two dampers (T

CDX-757MX

2-4. JACK BOARD

Remove the jack board of the arrow.

ground point screw (PTT2.6

jack board

2-5. MAIN BOARD , SLIDE V ARIABLE RESIST OR (ELEV A T OR HEIGHT SENSOR) (RV202)

main flexible board

Remove three solders of the slide variable resistor (RV202).

screw (FP)

(CNJ101)

two screws (FP)

main board

Remove two solders of the elevator motor leads (M104).

Remove two solders of the switch board leads.

screw (PTT2

slide variable resistor (elevator height sensor) (RV202)

heat sink (T)

screw (PTT2 × 4)

2-6. ELJ MOTOR ASSY (ELEVATOR) (M104)

bracket (EVM.S)

screw (PTT2

CDX-757MX

ELJ motor assy (elevator) (M104)

2-7. ESCUTCHEON (T)

Remove the claw in the direction of arrow

Remove the ditch in the direction of arrow

Remove the escutcheon (T) in the direction of arrow

two claws

claw

ditch

screw (T)

CDX-757MX

2-8. CHASSIS (U.S) SUB ASSY

three screws (PTT2 × 4)

chassis (U.S) sub assy

Remove the edge in the direction of arrow A.

two screws (PTT2 × 4)

2-9. CHASSIS ASSY

screw (PTT2 × 4)

spring (stopper.lower)

spring (SUT)

chassis assy

Turn the gear (EVD.S) fully in the direction of arrow A.

2-10. RF BOARD

two screws (PS2

CDX-757MX

RF board

two screws

(PS2

Remove four solders of the LSW board leads and spindle motor leads (M102).

Remove two solders of the sled motor leads (M101).

OP flexible board (CN102).

2-11. SLED MOTOR ASSY (251) (M101), OPTICAL PICK-UP (KSS-720A)

two precision screws (P2

Turn shaft (feed) assy in the direction of the arrow, then remove it.

sled motor assy (251) (M101)

OP flexible board

adhesive sheet

optical pick-up (KSS-720A)

optical pick-up

Note: After connecting OP flexible board,

fix it with adhesive sheet to optical pick-up.

CDX-757MX

)

2-12. LSW BOARD, SPINDLE MOTOR (S) SUB ASSY (M102)

two precision screws (P1.7

2.2)

precision screw (P2

2.5)

bracket (CP)

spring (chucking)

retainer (disc

precision scre (P2 × 2.2)

LSW board

2-13. ELJ MOTOR ASSY (CHUCKING) (M103)

two screws (PTT2 × 4)

retainer (CHM)

Remove the spindle motor (S) sub assy (M102) in the direction of the arrow.

Remove two solders of the chucking motor leads (M103).

ELJ motor assy (chucking) (M103)

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

)

3-1. ASSEMBLY FLOW

3-2. OPTICAL PICK-UP COMPLETE ASSY

(Page 15)

3-3. GEAR (LOMINI) / (LOAD 1) ASSY

(Page 16)

3-4. OPERATION CHECK

(Page 16)

CDX-757MX SECTION 3 ASSEMBLY

3-2. OPTICAL PICK-UP COMPLETE ASSY

chuck plate

Move the lever (LOCK 3A) in the direction of arrow A, and return it a little in the direction of arrow from the position where the chuck plate is moved down to the lower limit.

stop ring 2.0 (E type

tension spring (DH)

shaft (A)

optical pick-up complete assy Note: Insert the shaft (A) first.

CDX-757MX

3-3. GEAR (LOMINI)/(LOAD 1) ASSY

gear (LOAD 2)

marking Fig. A

Attach the gear (LOAD 1) assy with its facing inside.

gear (LOMINI)

slit

chuck plate

Attach the gear (LOMINI) at the position shown in Fig. A.

shaft (rotary prevention C)

stop ring 1.5 (E type)

Move the lever (LOCK 3A) fully in the direction of arrow to move the chuck plate up.

3-4. OPERATION CHECK

Confirm that the slider moves in the direction of arrow C to move down the chuck plate if the gear (LOAD 1) is rotated in the direction of arrow or the chuck plate moves up and the slider moves in the direction of arrow D if the gear is rotated in the direction of arrow B.

chuck plate

slider

gear (LOAD 1) assy

MECHANICAL ADJUSTMENT

• Elevator Height (Address) Adjustment

CDX-757MX SECTION 4

Note: This adjustments is necessary when the system controller (IC201),

variable resistor (RV201), slider (R), slider (L), or chassis (ELV) was replaced for any repair.

Connection:

power supply

(DC 14.4 V)

master unit

GND

BUS cable

compact disc changer

CONTROL connector (CN901)

Adjustment Method:

1. Connect this set to the master unit (e.g. MDX-C7970), load a disc magazine, and place the set vertically as shown below.

2. Connect the regulated power supply to the master unit, and turn the power on.

3. Press the DISC button on the master unit and select DISC 5.

4. At this time, if the elevator shaft does not position between comb teeth A and B at addresses 5 and 6 as shown below, adjust the following.

5. Press repeatedly the DISC + and – buttons on the master unit so that the elevator shafts moves from address 6 to address 5, or from 5 to 6. At this time, adjust RV201 on the main board so that the elevator shaft positions smoothly between comb teeth A and B.

6. Further, place the set horizontally and make same adjustment as mentioned above.

7. After adjustment at addresses 5 to 6 is finished, check all operations from addresses 1 to 10 with the set placed vertically and horizontally respectively to confirm that the ele vator shaft positions in a range between comb teeth A to B.

comb tooth at address 6

comb tooth at address 5

comb tooth at address 6

elevator shaft

A B

OK NG

elevator shaft

comb tooth at address 5

RV201

CDX-757MX

SECTION 5

ELECTRICAL CHECK

Note:

1. This check is performed with the set placed horizontally.

2. Power supply voltage: DC14.4 V (more than 3 A).

3. Be sure to use the disc “YEDS-18” parts code: 3-702-101-01, but only when indicated.

4. Use a master unit that supports SONY bus system.

Connection:

power supply

(DC 14.4 V)

master unit

GND

BUS cable

FOCUS BIAS CHECK

Connection:

– RF Board (Component Side) –

oscilloscope

(AC range)

–

TP (RFAC)

TP (VC)

IC101

compact disc changer

CONTROL connector (CN901)

Procedure:

1. Connect the oscilloscope to TP (RFAC) and TP (VC) on the RF board.

2. Put the set into play mode by loading the disc (YEDS-18).

3. Confirm that oscilloscope waveform is clear and check RF signal level is correct or not.

Note:

Clear RF signal waveform means that the shape “◊” can be clearly distinguished at the center of the waveform.

RF signal waveform

VOLT/DIV: 200 mV TIME/DIV: 500 ns (10 : 1 probe in use)

level: 1.4 ± 0.3 Vp-p

When observing the eye pattern, set the oscilloscope to AC range and raise the vertical sensitivity so that it may be easily seen.

TRACKING OFFSET CHECK

Connection:

– RF Board (Component Side) –

oscilloscope

(DC range)

CDX-757MX

–

TP (VC)

IC101

TP (TE)

Procedure:

1. Connect the oscilloscope to TP (TE) and TP (VC) on the RF board.

2. Put the set into play mode by loading the disc (YEDS-18).

. >

3. Press the

[ AMS ] button on the master unit, and check

the traverse waveform*.

4. Confirm that the oscilloscope waveform is symmetrical on the top and bottom in relation to 0 V dc, and check this level.

* Traverse waveform: This is the tracking error wave form appears

when crossing the track.

Traverse waveform

0 V

VOLT/DIV: 500 mV TIME/DIV: 2 ms Center: 0 V

A=B

traverse waveform (100 track jump waveform)

1919

+ 44 hidden pages

Sony CDX-757-MX Service manual

SERVICING NOTES

TABLE OF CONTENTS

GENERAL

DISASSEMBLY

2-1. DISASSEMBLY FLOW

2-2. CASE (UPPER. T), FRONT PANEL ASSY

mechanism deck (MG-251B-137)

jack board

2-5. MAIN BOARD , SLIDE V ARIABLE RESIST OR (ELEV A T OR HEIGHT SENSOR) (RV202)

ELJ motor assy (elevator) (M104)

2-7. ESCUTCHEON (T)

chassis (U.S) sub assy

chassis assy

RF board

ELJ motor assy (chucking) (M103)

3-1. ASSEMBLY FLOW

3-2. OPTICAL PICK-UP COMPLETE ASSY

3-3. GEAR (LOMINI)/(LOAD 1) ASSY

3-4. OPERATION CHECK

MECHANICAL ADJUSTMENT

ELECTRICAL CHECK