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(
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2. Slider Speed Control Offset Adjustment
•Objective
To optimize
the
DC offset voltage of the slider speed control
amp.
•Symptom when out of
Player does not playback (slider moves
at
stop).
adjustment
•Measurement instru-
ment connections
[Procedure]
Connect the oscilloscope to
TPl(CN103),
Pin 7
(SLDDRY).
GND
:
TPl
(CN103),
Pin
5
(AGND)
[This
connection
may be
via
a
low-pass filter (39k
Q
+lOOOpF)]
[Settings]
5
mY/division
5 ms/division
DC mode
1.
Move
the
pickup
to
midway
across the disc.
• Player state
•Adjustment location
•Disc
Stop
VRlOl
(SLD. OFS)
None needed
2.
If the
pickup continues
moving even when
you
try to stop it,
coarse
adjust VRlOl (SLD.OFS) to stop it.
3. Adjust
VRlOl (SLD.OFS) so
that the DC voltage
at
TPI
(CN103),
pin
7 (SLDDRV) is 0±10
mV.
4.
Check that
pickup movement is stopped.
3. Playback Power Re-Adjustment
Adjust
in the
same
manner
as
"
I
.
Playback Power
Adjustment"
in (Adjustment
1
).
DR- R504X
(Adjustment
2)
(Adjustment 2)
37
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