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DR- R504X
4. Recording
Power Adjustment
(Adjustment 2)
•Objective
To
optimize
the recording power of the laser diode.
•symptom when out of
The player does not record nor playback self-recorded discs.
It
also
skips tracks and the RF
adjustment
waveform is dirty.
(No
problems during CD playback)
•Measurement
instru-
Shine
the light
discharged from
•Player
state
ment
connections
the objective lens on the
light
power meter
sensor.
Spindle rotation frequency
:
Fourfold
speed, max power
ON
entry,
max
power ON
[Procedure]
[Settings]
Wavelength 790
nm
Average
mode
•Adjustment
location
VR104
(REC.
PW)
•Disc
None needed
I.
Fully
turn
VRI 04
(REC.PW) counterclockwise
to reduce the power
to
the minimum.
2.
Move the pickup to the outer edge
of
the disc.
3.
Spindle rotation frequency
:
Fourfold
speed,
max power ON entry and max power ON 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 playback
laser
diode output
is
an average
of 10 mW
±
0.05
mW.
Notes
• Power more
than
ten times
greater
than playback power
is
released during these
adjustments.
Never
look directly at
the objective lens.
•
The
laser
diode
may
be damaged if
the
recording power
is
greater than
the
specified
value.
Always
perform step I before making adjustments.
5. Focus Offset Adjustment
(Adjustment 2)
•Objective
To
coarse
adjust the DC offset voltage of the focus servo circuit for perform
the
tracking
adj
ustments
correctly.
•
Symptom when out of
The model does not focus
in, sound
broken and the RF
signal
is
dirty.
adjustment
•Measurement
instru-
Connect
the oscilloscope to
•
Player state
Spindle
rotation
frequency
: Normal
ment connections
TP201 (CN601),
Pin l
(RF)
speed, focus
ON,
spindle
ON/
tracking OFF
(Settings]
20mV/division
•Adjustment
location
VR6
(FE.
OFS)
10
ms/division
DC
mode
•Disc
YEDS-7
[Procedure]
J.
Move
the pickup
to
midway
across
the
disc
(R=35mm).
2.
In
the
normal
speed,
focus
ON
and
spindle
ON
state,
adjust VR6
(FE.
OFS)
so
that
the
amplitude
ofTP201
(CN601),
Pin
I
(RF) becomes
maximam.
-
38
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