Electrical Adjustments; Cd Section - Sony CX-BK2 Service Manual

Compact disc deck receiver

Hide thumbs Also See for CX-BK2:

Service manual (104 pages)

Table Of Contents

Table of Contents

CX-BK2

CD SECTION

Note:

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

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

3. 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:

BD board

TP (FE)

TP (VC)

Procedure:

Connect an oscilloscope to test point TP (FE) and TP (VC)

on the BD board.

While depressing the

Put the disc (YEDS-18) in and press the

actuate the focus search. (actuate the focus search when disc

table is moving in and out)

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

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 (Side B)

RFDC Level Check

Connection:

BD board

TP (RFDC)

TP (VC)

Procedure:

Connect an oscilloscope to test point TP (RFDC) and TP (VC)

on the BD board.

Turn the power on.

Put the disc (YEDS-18) in to playback the number five track.

Confirm that oscilloscope waveform is clear and check RFDC

signal level is correct or not.

Note: A clear RFDC signal waveform means that the shape "◊" can be

clearly distinguished at the center of the waveform.

SECTION 6