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
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