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DR- R504X
5.3 Adjustments
5.3.1 Adjustment 1
1. Playback Power Adjustment
•Objective
To optimize the playback power of the laser diode.
•Symptom when out of
Play does not start, track search is impossible, track are skipped.
adjustment
•Measurement
instru-
ment connections
[Procedure]
Shine the light dischrged from
•Player
state
the objective lens on the light
power meter
sensor.
[Settings]
Wavelength 790nm
Average mode
•Adjustment location
•Disc
I
.
Move the pickup
to
the outer edge of the
disc.
2.
Lights up the
playback
laser
diode by
laser
diode (LD) ON.
Laser diode (LD) ON
YRS (PB.
PW)
None needed
(Adjustment
1)
3.
Shine the
light
discharged from the objective lens in the pickup on the
light
power meter
sensor. Adjust YRS
(PB.PW)
so that the playback laser diode output is an average 0.6 mW
±
0.02 mW.
2. Coarse focus offset adjustment
(Adjustment
1)
•Objective
To
optimize the DC offset voltage of the focus error amp.
•Symptom when out of
The player does not focus in and the RF signal is
dirty.
adjustment
•Measurement
instru-
Connect the oscilloscope to
• Player state
Stop
ment
connections
TP201 (CN601)
,
Pin 6
(FCSER).
•Adjustment location
YR6
(FE.
OFS)
[Settings]
S mY/division
S
ms/division
DC mode
•Disc
None needed
[Procedure]
I.
Adjust YR6 (FE. OFS) so that the DC voltage at TP201, Pin
6
(FCSER)
is 0
±
lOmV.
30
(
(
(
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