Electrical Adjustments - Sony HCD-EC98P Service Manual

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Operating instructions (2 pages)

Table Of Contents

Table of Contents

HCD-EC98P

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 speciﬁ ed value with the following checks.

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

FOCUS BIAS CHECK

oscilloscope

(DC range)

CD board

TP121 (RFI)

TP124 (VC)

–

Procedure :

1. Connect the oscilloscope to TP121 (RFI) and TP124 (VC) on

the CD board.

2. Press the [

] button to turn the power ON, and press the [

?/1

button to open the CD disc tray.

3. Set disc (YEDS-18) on the trey and press the [N] button to

playback.

4. Conﬁ rm that oscilloscope waveform is as shown in the ﬁ gure

below. (eye pattern)

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

center of the waveform can be clearly distinguished.

Checking Location:

– CD Board (Conductor Side) –

TP124

(VC)

TP121

(RFI)

IC101

SECTION 5