Pioneer PDR-04 - Manual (Page 50)

PDR-04
6.2 Adjustment 1
6.2.1 Playback Power Adjustment Adjustment 1
• Objective
• Symptom when out
of adjustment
To optimize the playback power of the laser diode.
Play does not start, track search is impossible, track are skipped.
• Measurement instru­
ment connections
Connect the multimeter to
CN104 (TP1), Pin7(PWAJT)
► Player state
»Adjustment
location
»Disc
Test mode.
Playback laser diode ON
VR103 (PB. PW)
(HEAD BOARD assy)
None needed
[ Procedure ]
When adjusting with the multimeter.
(1) Lights up the playback laser diode using the DIGITAL SYNCHRO key.
(2) Adjust the voltage value of Pin 7 (PWAJT) of CN104 (TP1) to the voltage value (PB PW voltage ± 5mV) displayed on the
pickup flexible cable using VR103 (PB PW).
Note) This adjustment cannot be performed accurately If disc Is set. Be sure to remove disc first before adjustments.
Reference: When adjusting with the optical power meter.
(1) Move the pickup to the outer edge of the disc with the MANUAL / TRACK SEARCH FWD ►► key.
(2) Lights up the playback laser diode by DIGITAL SYNCHRO key.
(3) Shine the light discharged from the objective lens in the pickup on the light power meter sensor. Adjust VR103 (PB. PW)
so that the playback laser diode output is an average 0.6 mW ± O.OSmW.
(Wavelength 790nm, Average mode)
P: Playback power
R: Recording power
Recording on the disc is not possible In test mode.
50