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Sony BVU-950 - Page 39

Sony BVU-950
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Section
2.
DYNAMIC
TRACKING
BVU-920
Output
System:
P71:
Used
when
reducing
the
switching
pulse
delay
(without
search
TBC).
P70:
DT
ON,
TBC
OFF
and
the
servo
is
locked,
when
the
switching
pulse
out
is
—SH.
P36:
Ready
OK
when
LOW
(communications
are
ready).
P35:
Serial
communications
OUT
control.
TXD:
Serial
data
OUT
for
D/A
contverter
SCLK:
Clock
for
D/A
converter
serial
data.
P37:
Field
continuance
pulse
(PAL-M).
Pulse
is
through
to
output.
(NTSC,
PAL,
SECAM)
P26,
P27:
BIAS
OUT
for
strain
gauge
drift
adjustment.
P25:
When
SV
locked,
"H”".
P24:
OUT
for
LED
ON
during
distortion
suppression.
P23:
OUT
for
DT
ON
during
distortion
suppression.
P22:
Switches
D/A
OUT
to
distortion
mode.
"L”
during
distortion
suppression.
P21:
When
"L",
switching
pulse
OUT
is
-2.25H
and
horizontal
locking
is
also
applied
(SV
lock
or
DT
OFF).
P20:
When
DT
DISABLE
by
S201,
or
during
distortion
suppression,
the
level
of
this
output
changes
to
"L”.
As
a
result, the
DT
drive
amplifier
is
isolated
from
SG
and
the
D/A
output
is
input
as-is.
ICs108
and
109:
These
provide
the
DT
height
control
outputs
for
both
forward
and
reverse
polarities
by
the
switch
for
0
~
+5V
output
of
the
D/A
converter,
the
inverter
amplifier,
and
P41
&
42.
—_
(2)
DT-V
pulse
generator
Playback
RF
230-29A
to
30B
are
input.
The
RF
for
channels
A
and
B
are
input
to
[C201
and
switched
using
the
switching
pulse
provided
by
the
SV
to
form
a
continuous
RF
signal.
This
is
demodulated
by
IC202
and
the
gate
closed
at
1C203
to
pass
the
signal
only
around
V
SYNC.
SYNC
is
thus
extracted
from
the
composite
video
signal
at
1C203.
The
V
SYNC
signal
is
achieved
from
LPF
and
comparator.
Multividrator
1C206
determines
DT-V
pulse
position
and
width.
Fig.
2-12.
Vv
SYNC
our
LL
230-14A:
PB
SYNC
from
video
is
used
for
horizontal
locking
of
the
switching
pulse
output.
(When
Q213
tums
ON,
the
horizontal
lock
is
muted
(stopped).)
Pins
1,
2
and
15
of
1C208
constitute
a
switch
gate.
The
PB
SYNC
is
used
for
horizontal
sampling
of
the
RF
envelope.
Output
pin
9:of
IC207
creates
three
delays
(-
2.25H,
-5H,
and
+4.5H). The
switching
position
is
about
+4.5H
when
Q208
is
OFF
and
D203
is
OFF,
about
~2.25H
when
Q208
is
ON
but
D203
is
OFF,
and
about
—5H
(for
a
delay
of
70s
or
just
over
1H)
when
Q208
is
OFF
but
D203
is
ON.
The
output
from
pin
12
of
IC209
is
a
D
type
latch
which
determines
the
timing
for
the
switching
pulse
output.
During
searching
when
DT
is
ON
with
TBC
ON,
the
switching
pulse
output
switches
at
a
position
4.5H
after
PB.V.
4-23

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