Read Sony ZS-D1 Service Manual online
— 21 —
5-4.
REFERENCE
Focus/Tracking Gain Adjustment
A frequency response 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.
Focus/Tracking gain determines the pick-up follow-up (vertical and
horizontal) relative to mechanical noise and mechanical shock when
the 2-axis device operate.
However, as these reciprocate, the adjustment is at the point where
both are satisfied.
•
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.
Focus/Tracking gain determines the pick-up follow-up (vertical and
horizontal) relative to mechanical noise and mechanical shock when
the 2-axis device operate.
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.
increases.
•
When gain is lowered, it is more susceptible to mechanical
shock and skipping occurs more easily.
shock and skipping occurs more easily.
•
When gain adjustment is off, the symptoms below appear.
The following is a simple sdjustment method.
— Simple Adjustment —
Note :
Since exact adjustment cannot be performed, remember the
positions of the controls before performing the adjustment.
If the positions after the simple adjustment are only a little
different, return the controls to the original position.
positions of the controls before performing the adjustment.
If the positions after the simple adjustment are only a little
different, return the controls to the original position.
Procedure :
1.
Keep the set horizontal.
If the set is not horizontal, this adjustment cannot be performed
due to the gravity against the 2-axis device.
If the set is not horizontal, this adjustment cannot be performed
due to the gravity against the 2-axis device.
2.
Connect the oscilloscope between TP (FE) and TP (VC).
3.
Insert disc (YEDS-18) and press CD
^ button.
4.
Adjustment RV702 so that the waveform is as shown in the
figure below. (focus gain adjustment)
figure below. (focus gain adjustment)
•
Good Example
•
Incorrent Examples (DC level changes more than on adjusted
waveform)
waveform)
low focus gain
high focus gain
5.
Connect the oscilloscope between TP (TE) and TP (VC).
6.
Insert disc (YEDS-18) and press the CD
^ button.
7.
Adjust RV704 so that the waveform is as shown in the figure
below. (tracking gain adjustment)
below. (tracking gain adjustment)
•
Incorrect Examples (fundamental wave appears)
low tracking gain
high tracking gain
(higher fundamental wave than for low gain)
(higher fundamental wave than for low gain)
Tracking
low or high
low
low
high
Gain
Symptoms
• The time until music starts
becomes longer for STOP
➡ CD ^ or automatic
selection (
➡ CD ^ or automatic
selection (
0 , ) buttons
pressed). (Normally takes
about 2 seconds.)
about 2 seconds.)
• Music does not start and
disc continues to rotate for
STOP ➡ CD
STOP ➡ CD
^ or
automatic selection (
0 ,
) buttons pressed.)
• Sound is interrupted
during PLAY. Or time
counter display stops
progressing.
counter display stops
progressing.
• More noise during 2-axis
device operation.
Focus
low
—
—
high
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