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Note:
The current of the laser signal can be checked
with th voltage on both sides of R23 (102).The
difference for the specified value shown on the
level must be within + 6.0mA
KSS-
aio
51.7mA
02Y021
K517
Voltage across R23
Laser current Iop =
re
4. Tracking Balance Adjustment
Oscilloscope
(DC range)
TP3 (TE) ©
TP2 (VREF) o
1) Connect an oscilloscope to the test points TP7 (TE )
and TP6 (VREF).
2) Turn on the power switch.
3) Insert test disc TCD-782 (YEDS-18) and press the PLAY
button.
4) Connect the intermediate point of SFR3 to TP6 (VREF)
5) Adjust SFR1 (TB) so that the waveform on the oscillo
scope is vertically symmetrical as figure shown in the
figure below.
6) After the adjustment is completed,remove the connected
lead wires from the terminals.
>
w
VOLT / DIV: 200mV
TIME / DIV: 1mS
. Tracking Gain Adjustment
A 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. Focus/tracking gain determines the
pick-up follow-up (vertical and horizontal) relative to
mechanical noise and mechanical shock when 2-axis device
operates. However, as these reciprocate, the adjustment is at
the point where both are satisfied.
¢ When gain is raised, the noise increases when the 2-axis
device operates increases.
« When gain is lowered, it is more susceptible to mechanical
shock and skipping occurs more easily.
ar a oe
When gain adjustment is off, the symptoms below appear.
ee
eed
_
lo
WwW
Ww
The time until music starts
becomes longer for STOP
_ PLAY or automatic selection
(K€ ppl buttons pressed.)
(Normally takes about 2
seconds.)
eMusic does not start and disc
continues to rotate for STOP
PLAY or automatic selection
(44 pp] buttons pressed.)
«Disc stops to rotate shortly
after STOP ~»PLAY.
¢Sound is interrupted during
PLAY, or time counter display
stops.
More noises during the 2-axis
device opration.
The following is simple adjustment method.
= Simple adjustment =
Note: Since exact adjustment cannot be performed, remember the
positions of the controls before the performing the
adjustment.
If the positions after the simple adjustment are only a little
different, return the controls to the original position.
Oscilloscope
(DC range)
TP3 (TE) ©
TP4(VREF) ©
1) Keep the set horizontal. (If the set is not kept horizontally,
this adjustment cannot be performed due to the gravity
against the 2-axis device.)
2) Insert test disc TCD-782 and play back the second
composition.
3) Connect an oscilloscope to TP3 (TE) and TP4 (GND).
4) Adjust SFR3 so that the waveform appears as
shown in the figure below.(tracking gain adjustment)
OV
VOLT / DIv: 50mV
TIME / DIV: ImS
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