Pdr-04 – Pioneer PDR-04 User Manual
Page 64
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PDR-04
6.3.14 Fine Focus Offset Adjustment
Adjustment 2
• Objective
• Symptom when out
of adjustment
To optimize the DC offset voltage of the focus servo circuit.
The player 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.
500 nS/div.
AC mode
• Player state
• Adjustment
location
• Disc
Test mode, play
VR105 (FE. OFS)
(HEAD BOARD assy)
STD-R03
[ Procedure ]
(1) Move the pickup to midway across the disc (R = 35mm) with the MANUAL / TRACK SEARCH FWD ►► or REV
◄◄ keys.
(2) Press the FINALIZE key, the PLAY ► key, then the PAUSE
II
key in that order to close the respective servos and put
the player into play mode.
(3) Adjust VR105 (FE. OFS) so that the 3T waveform at CN204 (TP201), Pin 1 (RF) is maximum.
Note : Adjust after confirming that the WRITE KEY LED is OFF.
Out of adjustment
Optimum adjustment
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