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Sony UP-890MD - Page 49

Sony UP-890MD
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INT-V
A
a
Synchronized
0
1
2
3
4
5
tts,
63
64
65
STB
|
|
|
|
|
To
us
Te
[Ts
Ts
LS
ae
Tes
Tes
64CLK
|
|
——,
CLK
|
[ |
|
5.3MHz
‘
4th
stair
|
lst
stair
2nd
stair
3rd
stair
Sth
stair
6th
stair
64th
stair
DATA
16
bara}
fara]
foaral
foara)
foata)
_foatal
[paral
mal
|
64
bits
transferred
for
one
block
;
in
all
16
blocks
of
data
are
sent
in
parallel
(64DATA
X16=10240aTA)
OR
Fig.5-10.
Stair
Generation
5-6-3.
Basic
operation
All
the
signals
are
input
to
head
from
IC103.
This
section
only
explains
the
operations
for
one
block.
(The
operations
for
the
other
blocks
are
the
same.)
(i)
The
64
data
items
of
screen
printing
are
input
to
the
shift
register
synchronized
with
CLK.
(ii)
When
the
STB
pulse
is
input,
the
data
input
in
(i)
is
moved
from
the
shift
register
section
to
the
latch
section.
(iii)
When
the
DR
pulse
is
input,
the
output
stage
transistors
are
switched
ON/OFF
by
the
“H”
and
“L”
latch
section
data.
While
the
transistors
are
on,
the
resistors
heat
up
and
thermosensitive
paper
changes
color.
The
amount
of
heat
generated
is
controlled
by
varying
the
length
of
the
DR
pulses,
so
the
color
darkness
of
the
printing
on
thermosensitive
paper
can
be
varied.
*
Note:
The
BEO
terminal
goes
from
“L”
to
“H”
only
when
the
power
is
turned
on.
After
that
it
stays
“H”.
5-6-4.
Stair
generation
As
explained
in
the
last
section
on
basic
operation,
the
darkness
of
the
printing
can
be
controlled
with
the
DR
pulses,
but
it
is
also
possible
to
change
the
darkness
by
changing
the
high
and
low
data
input
to
the
latch
section.
This
section
explains
this
method.
(i)
The
data
recorded
in
video
memory
IC104
during
print
is
input
to
gradation
data
generation
circuit
IC103
by
one
print
line
using
a
picture
variable
power
operation
circuit
in
IC103.
The
stair
data
generation
circuit
outputs
the
6
bits
of
data
recorded
in
IC103
as
one
of
64
levels.
If
the
6-bit
data
is
“3”
,
then
DATA
“H”
is
sent
to
the
head
during
the
1st,
2nd,
and
3rd
stairs
of
DATA
1
to
6
in
Fig.5-
10,
but
from
the
4th
stairs
and
later,
the
DATA
“L”
is
sent.
In
this
way,
the
screen
is
printed
with
the
third
stair,
but
from
the
fourth
stair
and
later
is
not
printed.(See
the
explanation
of
the
basic
oerations
in
5-6-3.)
=
57

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