Electrical Adjustments - Sony HCD-CZ1 Service Manual

Network audio system

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Operating instructions manual (435 pages)

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Table Of Contents

Table of Contents

HCD-CZ1/NAS-CZ1

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CD SECTION

Note:

1. CD Block is basically constructed to operate without adjustment.

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

3. Use an oscilloscope with more than 10 MΩ 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.

5. Check the focus bias check when optical block is replaced.

FOCUS BIAS CHECK

CD board

TP (RFACO)

TP (VC)

Procedure :

1. Connect the oscilloscope to TP (RFACO) and TP (VC) on the

CD board.

2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)

3. Press the

button.

CD u

4. Confirm that the oscilloscope waveform is as shown in the

figure below. (eye pattern)

A good eye pattern means that the diamond shape (◊) in the

center of the waveform can be clearly distinguished.

• RF signal reference waveform (eye pattern)

VOLT/DIV: 0.2 V (with the 10: 1 probe in use.)

L 13942296513

TIME/DIV: 500 ns

When observing the eye pattern, set the oscilloscope

for AC range and raise vertical sensitivity.

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SECTION 5