Sanyo CP10 - Component Adjustments; PLL VCO, Focus, and Tracking Gain

PD
)
ADJUSTMENTS ;
Test disc ;
Measuring equipment ;
Connection point ‘
Adjustment point :
Adjustment value :
PLL VCO adjustment
YEDS 18 (Sony)
Oscilloscope
TP - 21 (PLL VCO OUT)
T 401
DC 1.240.1V
a
Connect
the
oscilloscope
to
TP21
(PLL—LPF
output signal).
b Play the test disc.
c
Adjust
1401
so
that
the
dense
portion
of
the
waveform
[output
signal
from
low
pass
filter
(LPF)
of
PLL
circuit
]
on
the
oscilloscope
becomes
DC
1.2
+
0,1
V.
(See
Fig.
3.)
5 Focus gain adjustment
a
Test disc ;
Measuring equipment ;
Connection point :
Adjustment point .
Adjustment value
YEDS 18 (Sony)
Memory scope; oscilloscope
TP - 2 (FE-SIGNAL)
SVR - 201
400mvV P -P
Play the test disc.
Connect
the
audio
signal
generator
to
TP51
[pin
22
of
1C201
(CX20108)]
via
a
100
kohm
resistor,
Connect
the
oscilloscope
or
memory
scope
to
TP2
via
the
band-pass
filter
and
observe
the
output.
Set
the
output
of
the
audio
signal
generator
to
400
Hz
3
VP-p
(1.1
Vrms).
Adjust
SVR201
so
that
the
output
waveform
on
the
memory
scope
becomes
400
mVp-p.
| Tracking gain adjustment
Test disc ;
Measuring equipment ;
Connection point ;
Adjustment point 7
Adjustment value ;
YEDS 18 (Sony)
Memory scope
TP - 3 (TE-SIGNAL)
SVR - 202
1.2V P-P
Play the test disc.
Connect the audio signal generator to TP52 [ pin 28
of 1C201 (CX20108)] via a 470 kohm resistor.
Connect
the
oscilloscope
or
memory
scope
to
TP3
(tracking error signal) via the band-pass filter and
observe the output.
Set the output of the audio signal generator to 400
Hz 3 Vp-p (1.1 Vrms).
Adjust SVR 202 so that the output waveform on the
memory scope becomes 1.2 Vp—p.
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Fig.
3.
BAND-PASS
FILTER
BAND -PASS
FILTER
OSCILLO- SCOPE
or
MEMORY - SCOPE
OSCILLO-SCOPE
or
MEMORY- SCOPE