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Alpine 3DE-7886R - Page 9

Alpine 3DE-7886R
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3DE-7886R
C.
Focus
Servo
Gain
Measurement
Measure
the
focus
servo
open
loop
gain
in
the
servo-on
(closed
loop)
condition.
1.
Block
Diagram
Sample
player
Oscillator
and
oscilloscope
2.
Measurement
Method
using
an
Oscillator
and
an
Oscilloscope
3.
Connection
(Example)
(a).
Connect
OSC
output
to
resistor
for
gain
measurement
(100
ohm).
(Connect
a
servo
driver
side
to
positive
side.)
osc
(b).
Connect
CH1
of
oscilloscope
to
a
servo
driver
side
of
resistor
for
gain
measurement
(100
ohm).
(Connect
negative
side
with
GND
of
set.)
(c).
Connect
CH2
of
oscilloscope
to
TC9296AF
(IC2101)
side
of
resistor
for
gain
measurement
(100
ohm).
(Connect
negative
side
with
GND
of
set.)
(d),
Play
back
the
eighth
track
of
A-BEX
TCD-782
disc
for
measurement.
(No
sound
recording
track)
(e).
Output
frequency
(1.2
KHz,
200
mVP-P)
from
OSC
and
compare
the
amplitude
of
CH1
and
CH2
of
oscilloscope
and
convert
into
dB.
Gain
(dB)
=20
Log
(CH2/CH1)
*
FOO:
Focus
drive
output
Specification:
Gain
Normal
if
it
is
within
023qB.
*
If
the
specificaiton
is
out
(NG),
TC9296AF
(1C2101)
(Digital
Servo
LSI)
is
malfunction.
NOTE:
AC
voltmeter
is
available
to
measurement.
Oscilloscope
or
AC
voitmeter
SS
Common
with
the
ground
of
the
set
TC9296AF
(IC2101)
#51
FOO
BA6791FP
(IC2103)
D.
Tracking
Servo
Gain
Measurement
Measure
the
tracking
servo
open
loop
gain
in
the
servo-on
(closed
loop)
condition.
1.
Block
Diagram
Sample
player
Oscillator
and
oscilloscope
2.
Measurement
Method
using
Oscillator
and
an
Oscilloscope
(a).
Connect
OSC
output
to
resistor
for
gain
measurement
(100
ohm).
3.
Connection
(Example)
(Connect
a
servo
driver
side
to
positive
side.)
(b).
Connect
CH1
of
oscilloscope
to
a
servo
driver
side
of
resistor
for
gain
measurement
(100
ohm).
(Connect
negative
side
with
GND
of
set.)
(c).
Connect
CH2
of
oscilloscope
to
TC9296AF
(IC2101)
side
of
resistor
for
gain
measurement
(100
ohm).
(d).
Play
back
the
eighth
track
of
A-BEX
TCD-782
disc
for
measurement.
(No
sound
recording
track)
(e).
Output
frequency
(1
kHz,
50
mVP-P)
from
OSC
and
compare
the
amplitude
of
CH1
and
CH2
of
oscilloscope
and
convert
into
dB.
Gain
(dB)
=20
Log
(CH2/CH1)
Specification:
Gain
Normal
if it
is
within
0#3cB.
*
If
the
specificaiton
is
out
(NG),
TC9296AF
(1C2101)
(Digital
Servo
LSI)
is
malfunction.
NOTE:
AC
voltmeter
is
available
to
measurement.
Oscilloscope
or
AC
voltmeter
1.
Common
with
the
ground
of
the
set
BA6791FP
(C2103)
TC9296AF
(IC2101)
#52
TRO
*
TRO:
Tracking
drive
output

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