Pioneer PDR-04 - Manual (Page 63)

PDR-04
6.3.12 ACT Offset Adjustment Adjustment 2
• Objective
• Symptom when out
of adjustment
To optimize the DC offset voltage of the actuator servo.
Player does not pause, track search is impossible, tracks are skipped.
• Measurement instru­
ment connections
Connect the oscilloscope to
CN5021 (TPOO), Pin 1 (ACT ERR).
(SERVO UCOM BOARD assy)
[ Settings ] 5 mV/div.
5 mS/div.
DC mode
» Player state
» Adjustment
location
» Disc
Test mode, focus and spindle servos
closed and tracking servo open.
VR1 (ACT. OFS)
(HEAD BOARD assy)
STD-903
[ Procedure ]
(1) Move the pickup to midway across the disc (R = 35mm) with the MANUAL / TRACK SEARCH FWD
◄◄ keys.
(2) Press the FINALIZE key, then the PLAY ► key in that order to close the focus servo then the spindle servo.
(3) Adjust VRI (ACT. OFS) so that the DC voltage at CN5021 (TPOO), Pin 1 (ACT ERR) is 0 ± 20mV.
or REV
6.3.13 ACT Gain Adjustment
Adjustment 2
> Objective
» Symptom when out
of adjustment
To optimize the actuator servo gain.
Player does not pause, track search is impossible, tracks are skipped.
» Measurement instru­
ment connections
Connect the oscilloscope to
CN5021 (TPOO), Pin 1 (ACT ERR).
(SERVO UCOM BOARD assy)
[ Settings ] 10 mV/div.
5 mS/div.
DC mode
> Player state
• Adjustment
location
• Disc
Test mode, focus and spindle servos
closed and tracking servo open.
VRI 0 (ACT. GAIN)
(HEAD BOARD assy)
STD-903
[ 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, then the PLAY ► key In that order to close the focus servo then the spindle servo.
(3) Press the WRITE key to light up the WRITE KEY LED, and short-circuit the Pin 2 and Pin 3 of CN5021 (TPOO).
(4) Adjust VR10 (ACT. GAIN) so that the DC voltage at CN5021 (TPOO), Pin 1 (ACT ERR) is -380 ± 20mV.
Note : Perform the run-on adjustment In the section 9 and 10.
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