Casio CZ-1 Service Manual And Spare Parts List page 105

18.
EXPANDER
CIRCUIT
In
order to extend the
dynamic
range of the
melody
signal,
a part of
DAC
output
waveform
is
contracted
and expanded by Expander
Circuit.
Exptfldtr
circuit
D
TC4051BP
From
DAC
IN
>
001002003
From
Music LSIt
*OUT
TC40S1BP
Function Ttblf
A
a
c
••ON"
Ch«nn«4
Amplituc*
L L L
1
H L
L
1
1/2
L
M
L
2 1/4
H H
L
3 1/8
L L
H
4
1/16
In
accordance with the
voltage levels of the signals
001,
002
and 003, one
of the input
channels
is
turned
on.
By
the
resistors
connected
to
each
channel, the amplitude
of
DAC
output
varies
from
1
to
1/16.