Casio CZ-1 Service Manual And Spare Parts List

11.
KEYBOARD
CZ-1
varies
the
sound
volume
in
accordance with the
key
touch speed
and depression
strength.
1M.
Key
Touch
Speed
Detection
Each key
has two
key
contact switches
S1
and
S2.
Front
Fig.11-1
When
a
key is
hit,
SI
turns
on first, then
S2.
The interval
time between
turning
on
of
SI
and
S2
varies
according
to
the touch
speed
of
the key.
LSI
MSM
6200 detects
the time
interval
and
determines the key touch speed.
Some RC
(resistor
and
capacitor)
integrating
circuits are
connected
to
the MSM6200
and
when switch
SI
turns on,
the RC circuit
starts
KCA
to
discharge.
The
discharging
stops
when
S2
turns on.
The
MSM
6200
also
contains an
ADC
(Analog
to
Digital
Converter) and
changes
the voltage
Vc of the
RC
circuits
into
a
5-bit
digital signal
which
is sent
to the
CPU
as key entry
and
hitting
speed data.
kca
TriJiruiJWLJinjinji
KCB
Kl
mjuuuwuum
S2
ON
Rtleast
SI ON
~inr
Fig.
112
-30-

Casio CZ-1 Specifications

General

Brand	Casio
Model	CZ-1
Category	Synthesizer
Language	English