Sony CDP-400 - Page 26

CDP-400/501/501ES/610ES
CDP-400/501 /501ES/610ES |
REFERENCE
Focus/Tracking Gain Adjustment
A special servo analyzer is necessary in order to
perform this adjustment exactly.
However, this gain has a margin, so even if it is
slightly off, there is no problem. Therefore, do not
perform this adjustment.
Normally, RV205 and RV301 are set in the posi-
| tions shown below.
(seen fram component side) {seen from conductor side)
Focus/tracking gain determines the pick-up follow-
' up (vertical and horizontal) relative to mechanical
noise and mechanical] shock when the 2-axis device
operates.
However, as these reciprocate, the adjustment is at
the point where both are satisfied.
@ When gain is raised, the noise when the 2-axis
| device operates increases.
@ When gain is lowered, it is more susceptible to
mechanical shock and skipping occurs more easily.
| When gain adjustment is off, the symptoms below
appear.
Gain
F :
Symptoms ‘ocus Tracking
F ; ; a —
| The time until music starts
becomes longer for STOP
~+PPLAY or automatic low low or high
selection (144, PP} buttons
pressed. (Normally takes
{
| about 2 seconds.)
1S isa ae
i @ Music does not start and
i disc continues to rotate
H for STOP -+ > PLAY or - low
automatic selection (hd.
bPibuttons pressed.) i
ae oe j
Ve Disc table opens shortly
after STOP -PPLAY.
e Sound is interrupted dur-
ing PLAY. Or time counti- _ low
: er Aisplay stops progress-
j ing.
tow or high Ess
i e More noise during 2-axis
i device operation.
fee eee i Eee
high high
The following is a simple adjustment method.
— Simple Adjustment —
Note: Since exact adjustment cannot be performed, re-
member the positions of the controls before perform-
ing the adjustment. If the positions after the simple
adjustment are only a little different, return the
mechanical center mechanical center controls to the original positions.
midway between , } } Procedure:
and mechani-__! ;
cal
center
x)
Ee
ee
midway
between
oscilloscope
7 S\ ‘MIN and mechani- {DC range}
| a v cal center
| > H x servo amp board C)
| x ,
i
(Agen
ps
—
| Oo s Py
| MIN 7 MAX Aor | MIN TFS © ij a bs
I (low gain} thigh gain} tr flow gain) &
| {
i
TP6
Ow-
=?
1. Keep the set horizontal.
/Mf the set is not horizontal, this adjustment
cannot be performed due to the gravity against |
the 2 axis device. /
nN
. Connect oscilloscope to servo amp board TPS.
3. Adjust RV205 so that the waveform is as shown in
the figure below. (focus gain adjustment)
pry eaten Nea Lh 0.9 —1.2V
@ Incorrect Examples (DC level changes more than
adjusted waveform).
low focus gain
2Vv
OV
high focus gain
Foe ote ne Ap ant Depatgag RR! eT ETT NS Oo. O3V
ri ov
4. Connect oscilloscope to servo amp board TP6.
5. Adjust RV301 so that waveform is as shown in the
figure below. (tracking gain adjustment)
® Incorrect Examples (fundamental wave appears)
low tracking gain
However, traverse waveform at tracking
balance adjustment is acceptable.
high tracking gain
Fundamental wave is higher than at low gain.
However, oscillating waveform is acceptable.
po