Sony CDP-CE575 Electrical Adjustments, Ver 1.1 2001.07SECTION, S Curve Check, Connection

CDP-CE575

Ver 1.1 2001.07SECTION 6

ELECTRICAL ADJUSTMENTS

Note:

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

2.Use PATD-012 disc (4-225-203-01) 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

Connection:

oscilloscope

BD board

TP (FE1) +

TP (VC) –

Procedure:

1.Set the test disc (PATD-012). Disc chucking operation is complete, then press the [POWER] button to turn the power off.

2.Connect an oscilloscope to test point TP (FE1) and TP (VC) on the BD board.

3.Connect between test point TP (ADJ) on the MAIN board and GND by lead wire.

4.Press the [POWER] button to turn the power on and enter the ADJ mode.

Then playback the number two track automatically, press the x button to stop the playback.

5.Press the [CHECK] button actuate the focus search. (actuate the focus search when disc table is moving in and out)

6.Check the oscilloscope waveform (S-curve) is symmetrical between A and B. And confirm peak to peak level within 2 ± 1 Vp-p.

S-curve waveform

symmetry

A

within 2 ± 1 Vp-p

B

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.

Checking Location: BD board

RFDC Level Check

Connection:

oscilloscope

BD board
TP (RFDC)	+
TP (VC)	–

Procedure:

1.Set the test disc (PATD-012). Disc chucking operation is complete, then press the [POWER] button to turn the power off.

2.Connect an oscilloscope to test point TP (RFDC) and TP (VC) on the BD board.

3.Connect between test point TP (ADJ) on the MAIN board and GND by lead wire.

4.Press the [POWER] button to turn the power on and enter the ADJ mode, then playback the number two track automatically.

5.Confirm that oscilloscope waveform is clear and check the level

of between RFDC top and VC is correct or not.

Note: A clear RFDC signal waveform means that the shape “◊ ” can be clearly distinguished at the center of the waveform.

RFDC signal waveform

VOLT/DIV: 200 mV

TIME/DIV: 500 ns

level: 1.15 ± 0.35 Vp-p

VC

Checking Location: BD board

RFAC Level Check

Connection:

oscilloscope

BD board
TP (RFAC)	+
TP (VC)	–

Procedure:

1.Set the test disc (PATD-012). Disc chucking operation is complete, then press the [POWER] button to turn the power off.

2.Connect an oscilloscope to test point TP (RFAC) and TP (VC) on the BD board.

3.Connect between test point TP (ADJ) on the MAIN board and GND by lead wire.

4.Press the [POWER] button to turn the power on and enter the ADJ mode, then playback the number two track automatically.

5.Confirm that oscilloscope waveform is clear and check RFAC

signal level is correct or not.

Note: A clear RFAC signal waveform means that the shape “◊ ” can be clearly distinguished at the center of the waveform.

RFAC signal waveform

VOLT/DIV: 200 mV

TIME/DIV: 500 ns

level: 1.35 ± 0.4 Vp-p

Checking Location: BD board

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