Pioneer PDR-04 - Manual (Page 68)

PDR-04
6.3.18 Recording Power Adjustment Adjustment 2
• Objective
• Symptom when out
of adjustment
To optimize the recording power of the laser diode.
The player does not record nor playback self-recorded discs. It also skips tracks and the RF
waveform is dirty. (Mo problem during CD playback)
• Measurement instru­
ment connections
Connect the multimeter to
CN104 (TP1), Pin 7 (PWAJT). ' Player state
• Adjustment
location
• Disc
Test mode, maximum recording
power ON
VR104 (REC. PW)
(HEAD BOARD assy)
None needed
[ Procedure ]
When Adjusting with the multimeter
(1) Fully turn VR104 (REC. PW) counterclockwise to reduce the power to the minimum.
(2) Press REC o and REC MUTE O keys in this order to lights up the laser diode.
(3) Adjust the voltage value of Pin 7 (PWAJT) of CN104 (TP1) to the voltage value (REC. PW voltage + 10mV) displayed on
the pickup flexible cable using VR104 (REC. PW).
Notes:
• Power more than ten times greater than playback power is released during these adjustment.
Never look directly at the objective lens.
• This adjustment cannot be performed accurately if disc is set. Be sure to remove disc first before adjustments.
• Perform this adjustment more than two minutes after starting up the test mode (after inserting the AC plug).
• The laser diode may be damaged if the recording power is greater than the specified value.
Always perform step 1 before making adjustments and be careful not to exceed the adjustment value by more than 50mV
(specified value in step 3).
P: Playback Power
R: Recording Power
Reference : When adjusting with optical power meter.
(1) Fully turn VR104 (REC. PW) counterclockwise to reduce the power to the minimum.
(2) Move the pickup to the outer edge of the disc with the MANUAL / TRACK SEARCH FWD ►► key.
(3) Press REC o and REC MUTE O keys in that order to lights up the laser diode.
(4) Shine the light discharged from the objective lens in the pickup on the light power meter sensor and adjust VR104 (REC.
PW) so that the recording laser diode output is an average of 4.7mW ± 0.1 mW (Wavelength 790nm, Average mode).
Notes:
• Perform this adjustment more than two minutes after starting up the test mode (after inserting the AC plug).
• The laser diode may be damaged if the recording power is greater than the specified value.
Always perform step 1 before making adjustments and be careful not to exceed the adjustment value by more than 0.3mW
(specified value in step 3).
• Power more than ten times greater than playback power is released during these adjustment.
Never look directly at the objective lens.
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