Technicolor - Thomson CDP-CX57 Section Electrical Adjustments, Curve Check, RF Level Check

Page 17

SECTION 6

ELECTRICAL ADJUSTMENTS

Note :

1.CD Block is basically designed to operate without adjustment. There- fore, check each item in order given.

2.Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.

3.Use an oscilloscope with more than 10MΩ impedance.

4.Clean the object lens by an applicator with neutral detergent when the signal level is low than specified value with the following checks.

S Curve Check

oscilloscope

BD board

 

TP (FE)

+

TP (VC)

–

Procedure :

1.Press the I/u button and turn ON the power supply.

2.Open the front cover, and press the [PLUSÊONE] button.

3.Set the disc (YEDS-18) into the “PLUS ONE” slit.

4.Close the front cover, and chuck the disc.

5.Press the I/u button and turn OFF the power.

6.Connect the oscilloscope to TP (FE) of the BD board.

7.Connect TP (ADJ) of the MAIN board and connect TP (GND) with a lead wire.

8.Press the I/u button and turn ON the power.

9.The first track will be played back automatically. When the [CHECK] button is pressed, “S-JI mode” will be displayed on the fluorescent indicator tube, and focus search will be repeated.

10.Check the oscilloscope waveform (S-curve) is symmetrical be- tween A and B. And confirm peak to peak level within 1.8 ± 0.6 Vp-p.

S-curve waveform

symmetry

A

within 1.8 ± 0.6 Vp-p

B

11. Turn OFF the power, and remove the lead wire connected at step 7.

Note : • Try to measure several times to make sure than the ratio of A

: B or B : A is more than 10 : 7.

•Take sweep time as long as possible and light up the brightness to obtain best waveform.

RF Level Check

oscilloscope

(AC range)

BD board

 

TP (RF)

+

TP (VC)

–

Procedure :

1.Press the I/u button and turn ON the power supply.

2.Open the front cover, and press the [PLUSÊONE] button.

3.Set the disc (YEDS-18) into the “PLUS ONE” slit.

4.Close the front cover, and chuck the disc.

5.Press the I/u button and turn OFF the power.

6.Connect the oscilloscope to TP (RF) of the BD board.

7.Connect TP (ADJ) of the MAIN board and connect TP (GND) with a lead wire.

8.Press the I/u button and turn ON the power.

9.Playback the fifth track of the disc.

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

11.Turn OFF the power, and remove the lead wire connected at step 7.

Note : A 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

level: 1.8 +0.3–0.2Vp-p

E-F Balance (Traverse) Check

The procedure for this checking method differs for when a gen- eral remote control unit is used and not used.

oscilloscope

BD board

 

TP (TE)

+

TP (VC)

–

When a general remote commander is used:

1.Press the I/u button and turn ON the power supply.

2.Open the front cover, and press the [PLUSÊONE] button.

3.Set the disc (YEDS-18) into the “PLUS ONE” slit.

4.Close the front cover, and chuck the disc.

5.Press the I/u button and turn OFF the power.

6.Connect the oscilloscope to TP (TE) of the BD board.

7.Connect TP (ADJ) of the MAIN board and connect TP (GND) with a lead wire.

8.Press the I/u button and turn ON the power.

9.Playback the fifth track of the disc.

10.Press the [3] button on the remote commander. (The tracking servo and the sledding servo are turned OFF.)

11.Check the level B of the oscilliscope's waveform and the A (DC voltage) of the center of the Traverse waveform. Confirm the following :

A/B x 100 = less than ± 10%

 

Center of the

Traverse waveform

waveform

 

B

0 V

A (DC voltage)

 

 

level: 0.9 ± 0.45 Vp-p

12.Press the [8] button on the remote control unit. (The tracking servo and sledding servo are turned ON.) Confirm the C (DC voltage) is almost equal to the A (DC voltage) is step 11.

Traverse waveform

 

C (DC

0 V

voltage)

Tracking servo

Tracking servo

Sled servo

Sled servo

OFF

ON

13.Turn OFF the power, and remove the lead wire connected at step 7.

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Contents Line OUT SpecificationsDigital OUTMechanical Adjustments Table of ContentsSection Servicing Notes Except for the customers in the United States and CanadaSafety CHECK-OUT Restrictions in CD-TEXT Display CD-TEXT Test DiscChecking Method ′ μ Front Panel Section GeneralLocation of Parts and Controls CASE, Front Panel Section DisassemblyAudio BOARD, Main Board CD Mechanism Deck SectionBD BOARD, Sled Motor M102 Base UnitOptical PICK-UP KSS-213B/S-N Fluorescent Indicator TUBE, LED ALL LIT, and KEY Check Mode Test ModeADJ Mode Fluorescent Indicator Tube and LED Check Mode Aging ModeShipment Mode Set to this mode when returning the unit to the userError code Aging procedureError Display Disc Sensor Aligment Section Mechanical AdjustmentsFlat portion center Disc Holder a Aligment Magnet Assy AligmentCurve Check Section Electrical AdjustmentsRF Level Check Balance Traverse CheckAbout RV601 on the Main board RF PLL Free-run Frequency CheckAdjustment Location Circuit Boards Location Section DiagramsSingapore model Waveforms BD Section IC101 $Á Rfsm Play ModeMain Section Diaplay SectionCDP-CX57 Block Diagrams BD Section2ND CD Main SectionPrinted Wiring Board BD Section Schematic Diagram BD Section Printed Wiring Board Audio Section See page 21 for Note Schematic Diagram Audio SectionPrinted Wiring Board Main Section Schematic Diagram Main Section Printed Wiring Boards Panel Section Schematic Diagram Panel Section Printed Wiring Boards SENSOR/MOTOR Section Page Schematic Diagram SENSOR/MOTOR Section IC102 LC78622E IC Block Diagrams BD Board IC101 LA9241MIC203 LA5601 IC103 LA6541 IC104 LC89170MMain Board IC201 LA5602 Display Board IC903 M66310FP IC601 BA6780Pin No Pin Name Function IC PIN Function DescriptionRfsm CV+RFS SLCVvss DefiIset VvddXvss XvddSbsy EflgLdin ResetTbll TblrSrdt SclkDqsy SENS1Exploded Views SectionCase Section 4948-515-1 Illumination Assy66 A-4724-009-A Display BOARD, Complete Front Panel SectionChassis Section Mechanism Deck CDM-46C2 360 357 354 351 355359 354 353358 356 405 407 401 408 402 406 Optical Pick UP Section KSS-213B/S-N409406 404 403 Section Electrical Parts List Audio Ceramic Chip SwitchCeramic Chip 2PF TransformerDisc Sensor R Disc Sensor S Display Ferrite Bead LED MainMain Motor Power SW Table Sensor CORD, Connection Control A1 CND Accessories & Packing MaterialsMANUAL, Instruction SWEDISH, FINNISH, Danish AED Hardware ListSony Corporation

CDP-CX57 specifications

The Technicolor - Thomson CDP-CX57 is a versatile and feature-rich compact disc player designed to enhance the listening experience for audiophiles and casual listeners alike. As part of Thomson's long-standing legacy in audio technology, the CDP-CX57 combines sleek design with advanced digital audio technologies, making it a popular choice for those seeking high-quality sound reproduction.

One of the standout features of the CDP-CX57 is its ability to support a wide range of disc formats. This player is compatible with standard audio CDs, as well as CD-R and CD-RW media, allowing users to enjoy a diverse library of music collections. Enhanced playback capabilities enable users to experience their favorite tracks with clarity and precision.

Equipped with high-performance digital-to-analog converters (DACs), the CDP-CX57 delivers rich, detailed audio reproduction. This technology transforms digital signals into analog signals, resulting in improved sound quality and a more immersive listening experience. The unit's excellent jitter suppression further ensures that audio playback remains stable and free of distortion.

The CDP-CX57 also features programmable playback options, allowing users to create custom playlists and enjoy their music in a personalized manner. Additionally, the unit comes with a user-friendly remote control, enabling effortless navigation through tracks and settings from a distance.

Built for longevity, the CDP-CX57 boasts a robust construction that protects sensitive internal components from external interference. This durability extends the player’s life and ensures optimal performance over time. Furthermore, the sleek design and compact footprint make it an attractive addition to any audio setup, fitting seamlessly into various environments.

The Technicolor - Thomson CDP-CX57 is an ideal blend of advanced technology and user-friendly features, catering to both seasoned audiophiles and those new to the world of high-fidelity audio. With its exceptional sound quality, versatile playback options, and durable design, it remains a standout choice for music lovers seeking a reliable and enjoyable listening experience.
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