Pdr-04 – Pioneer PDR-04 User Manual

Page 51

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PDR-04

6.2.2 Coarse Focus Offset Adjustment

Adjustment 1

' Objective

Symptom when out

of adjustment

To coarse adjust the DC offset voltage of the focus servo circuit for perform the tracking and

slider adjustments correctly.

The model does not focus in, sound broken and the RF signal is dirty.

> Measurement instru

ment connections

Connect the oscilloscope to

CN204(TP201), Pin 1 (RF)
(SERVO UCOM BOARD assy)

[ Settings ]

20 mV/div.

2 mS/div.

DC mode

Player state

• Adjustment

location

• Disc

Test mode,focus and spindle servos

closed and tracking servo open.

VRIOS(FE.OFS)

(HEAD BOARD assy)

STD-903

[ Procedure ]

(1) Press the FINALIZE key, then the PLAY ► key in that order to close the focus servo then the spindle servo.

(2) Adjust VR105 (FE. OFS) so that the amplitude of waveform at CN204 (TP201), Pin 1 (RF) is maximum.

>■.%

V>SSSiS v>s

Out of adjustment

Optimum adjustment