Casio CZ-1 Service Manual And Spare Parts List

11-6. After
Touch
Control
Circuit
VDD
Kay
10KB
IK
'////////J
X
s
I
§
POS
s
POO
RO
AN2
WR
PF7
V
PFS
SN74LS174N-1
Tp
VCA
MJM466800-1
(Control
voltogt
of
ampiifiart
Invertor
Aftar
touch
sansor
'L3139
(EACH
OICODiR/DSMULTIPLtXiRI
FUNCTION
TABLE
li
°
2
1G
1A
IB
2G
2A
1Y2
2Y0
5r
AFTER
TOUCH
PARAMETER
IS
8
I
Noprastura
3.8V
2.0V
GNO
VC
output
h—
PrasturaMaa.
GNO
GNO
GNO
LS174
FUNCTION
TABLE
(EACH
FLIP-FLOPI
INPUTS
OUTPUTS
ENABLE
SELECT
B
A
YO
Y1
Y2
Y3
X
X
L
L
L
H
H L
H
H
XZXrx
xxrxx
zr
z
Z
Z
rzzzz
INPUTS
OUTPUTS
CLEAR
CLOCK
Q
at
L
XX
H t
H
H
t
L
H
L
X
L
H
H
L
L
H
Q«
Go
H»highlaval.
L*lowlaval.
X-irrtlnont
H«hioh iaval Ittntfy natal
L
•
low
lava!
(staady
itatal
X«kralavant
t
"transition
from low
to
nig*
laval
Q#
-tha
laval
of
O
bafora
tna indicated steady*stata
input conditions wara
establitned.
t
-
'176.
LSI
75.
and
SI
75
only
(1)
Whtn tht
after
touch
sensor
is
pressed
herder, its
resistance
becomes
lower
dropping
the
voltage
level of
terminal
AN2.
(2)
Main
CPU
convenes
analog
signal into
digital
data
in
the
internal
AOC
(Analog
to
Digital
Converter),
then
output
the data
to
DAC
(Digital
to
Analog
Converter)
block.
(3)
These
data
are
converted
to
analog
signal
by
DAC
block.
(4)
The
output
voltage VC
is input to
VCA (M5241
L)
on
PCB AS1M,
to
vary
the amplitude of
the
VCA.
Note:
Construction
of after
touch
sensor.
I
nttr-connect
or
After touch
sensor is
a
sheet of
silicon
rubber
in which
carbon
particles
are
inlaid.
While
no force is
applied,
the
resistance
between the
both sides
is
infinity. However,
when
it is pressed
hard, the density of the
carbon
becomes
high
causing
i
its resistance
to be
as
small
as 10
-
30
ohms.
1
The silicon rubber
is
put
between two
thin
metal plates.
.38-

Casio CZ-1 Specifications

General

Brand	Casio
Model	CZ-1
Category	Synthesizer
Language	English