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Sony BVU-950 - Page 85

Sony BVU-950
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BVU-950/920
Answer
Key
Page
4.
19).
20).
21).
22).
23).
24).
25).
What
signals
are
combined
at
Pin
6
of
IC-603,
Mix
Amp,
of
the
SV-88
board
and
give
a
brief
explanation
of
each.
S
torque
DA-error
voltage
output
from
the
servo
micro-computer
derived
from
a
combination
of
tension
error
from
the
tension
detector
and
speed
error
from
F.G.'s.
S
reel
current
-
feedback
from
the
reel
motor
AC
FB
gain
select
-
gain
control
to
control
gain
of
the
reel
motor
according
to
tape
length
and
mode
of
operation.
Capstan
current
(Inertia
control)
-
to
control
the
reel
motor
according
to
capstan
motor
speed,
used
in
search
modes
only.
What
is
different
about
the
servo
of
the
BVU-950
compared
to
previous
models
of
U-Matics?.
it
is
microcomputer
controlled.
What
are
the
building
blocks
of
the
BVU-950/920
servo?
CTC's,
controlled
timer
counter;
microcomputer;
ITMR's,
interval
timer
counters;
I/O
expanders.
Which
I.C.
is
responsible
for
supplying
clocks
for
the
servo
circuits?
(C-422
divides
a
12Mhz
crystal
oscillator
for
circuit
clocks.
What
are
the
values
of
Vref
and
1/2
Vref?
5V
and
2.5V
Briefly
explain
the
process
of
converting
the
microcomputer
output
to
error
voltages.
Digital
data
output
from
IC-1
is
D/A
converted
by
IC-411.
Data
is
then
demultiplexed
by
IC's
414,
415
and
latched
by
IC's
416
and
417.
Briefly
describe
the
operation
of
IC's
216,
120
and
516
of
the
SV-88
board.
These
are
I/O
expanders
which
are
used
to
interface
the
servo
to
the
main
microcomputer.

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