EasyManua.ls Logo

Samsung SR-S20DTD - Page 28

Samsung SR-S20DTD
105 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Loading...
8-6)
Key
Scan
&
Display
Circuit
Part
PANEL
PCB
@
Key
Scan
and
Display
Operation
As
is
seen
on
each
wave
form
of
the
following,
send
“HIGH”
output
in
an
order
of
MICOM
PIN
NO
#3—-#4—-#5—#6—#7—#8
for
2msec
in
a
cycle
of
12msec
using
six
terminals
of
MICOM
NO
#3,
4,
5,
6,
7,
8.
This
signal
appears
onto
output
terminal
through
input
terminal
of
ICO5(UDN2981
or
KID65783AP).
At
this
time,
peak-to-peak
voltage
of
the
spherical
wave
is
about
11V(DC
RMS1.5),
and
form
of
output
wave
form
is
like
the
drawing
1.
Mog
\
10msec
\
V
bute
la
as
3
GRID
#1
[rv
VIG
i
GRID#2
|
|
|
;
|
|
|
Ce
r]
ae
7]
GRID
#3
bs
4
|
Vel
ae
oe
ai
;
|
GRID#4
|
'
3
|
| |
a
cae
7
7
GRID#S
|
i
toi
@)
Key
Scan
When
the
wave
form
of
GRID#2
is
outputted,
this
signal
is
provided
to
SW6
button
through
the
resistance
of
10K0.
When
SW6
is
pressed
at
this
time,
signal
gets
smaller
by
R501(12k2),
and
about
4.5V
of
peak-to-peak
voltage
is
applied
to
MICOM.
MICOM
judges
that
the
wave
form
of
GRID#1
is
inputted,
and
changes
function
corresponding
to
SW6
KEY.
In
this
way,
each
wave
form
of
GRID
is
recognized.

Table of Contents

Related product manuals