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Sanyo 28DN1 - Page 5

Sanyo 28DN1
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6.
HORIZONTAL
OUTPUT
A
horizontal
oscillation
signal
is
output
from
pin37
of
1C201
and
switches
the
drive
transistor
Q431.
This
switching
signal
is
current
amplified
by
the
drive
transformer
T7431
and
drives
the
output
transistor
Q432.
When
Q432
becomes
ON,
an
amplifying
current
flows
directly
to
DY
through
C441
—
DY
—
0432
—
GND,
and
defection
is
performed
in
the
last
half
of
the
scanning
period.
Next,
when
Q432
becomes
OFF,
the
charge
that
had
been
stored
in
DY
up
to
that
point
releases
a
resonance
current
to
the
resonant
capacitors
C421/C423
and
charges
them.
The
current
stored
in
C421/C423
is
then
flowed
back
to
DY,
and
an
opposite
charge
is
then
stored
in
DY.
This
opposite
charge
then
switches
the
dumper
diode
in
Q432
ON,
the
resonance
state
is
completed,
and
an
amplifying
current
is
then
flowed
again
directly
to
DY
through
the
dumper
diode.
By
this
means,
deflection
in
the
first
half
of
the
scanning
period
is
performed,
and
when
Q432
becomes
ON
at
the
end
of
the
first
half
of
the
scanning
period,
deflection
during
the
last
half
is
begun,
thus
completing
one
cycle.
In
the
PCC
circuit
consisting
of
Q461
and
Q462,
the
parabola
signal
supplied
from
the
vertical
circuit
is
added
at
the
horizontal
output
stage
and
pincushion
compensation
is
performed
by
varying
the
DC
voltage
bias.
Further,
the
ABL
voltage
is
feedback
to
the
base
of
Q462
to
compensate
for
width
variations
due
to
variations
in
the
beam
current.
7.
CPU
<System
and
Teletext
Control>
Pin
description
Pini:
Tuning
voltage
output
Pin2:
Brightness
control
output
(6-bit
DAC)
Pin3:
Contrast
control
output
(6-bit
DAC)
Pin4:
Colour
control
output
(6-bit
DAC)
Pin5:
Sharpness
control
output(6-bit
DAC)
Pin6:
Not
used
(GND)
Pin7:
Not
used
(GND)
Pin8:
Power
ON/OFF
output
(H:ON)
Pin9:
AFT
signal
input
Pin10:
Option
SW1
&
Keyboard
scan
input
(DC)
Pin11:
Option
SW2
Pin12:
50/60Hz
switch
input
(50Hz:
Hi)
Pin13:
GND
Pin14:
TV/AV
switch
output
(TV:
Hi)
Pin15:
S-VHS
switch
output
(S-VHS:
Hi)
Pin16:
Option
SW3
(2AV:
Hi)
Pin17:
Function
signal
input
for
SCART
1
Pin18:
Function
signal
input
for
SCART2
Pin19:
Power
LED
drive
outputt
Pin20:
Option
SW4
&
Power
LED
drive
output2
Pin21:
Ignore
output
Pin22:
GND
Pin23:
CVBS
input0O
(Internal)
Pin24:
CVBS
input1
(Internal/External)
F2VCV
Pin25:
Pin26:
Pin27:
Odd/Even
output
Pin28:
GND
Pin29:
-
Pin30:
V-deflection
stop
output
Pin31:
RGB
REF
Pin32:
Blue
output
for
OSD
Pin33:
Green
output
for
OSD
Pin34:
Red
output
for
OSD
Pin35:
Blanking
output
for
OSD
Pin36:
H-sync.
input
(Horizontal
pulse
for
OSD)
Pin37:
V-sync.
input
(Vertical
pulse
for
OSD)
Pin38~39:
Supply
(+5V)
Pin
40:
OSC
GND
Pin
41:
Oscillator
input
for
CPU
Pin
42:
Oscillator
output
for
CPU
Pin
43:
Reset
input
Pin
44:
Supply
(+5V)
Pin
45:
Protect
signal
input
(L:Power
circuit
defects)
Pin
46:
Ident.
signal
input
Pin
47:
R/C
signal
input
Pin
48:
Mute
output
in
no
picture
Pin
49:
|2C
bus
SCL
(Serial
clock)
Pin
50:
I2C
bus
SDA
(Serial
date)
Pin
51:
Option
SW5
&
Band
select
outputt
Pin
52:
Band
select
output2
Black
IREF

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