Casio CZ-1 Service Manual And Spare Parts List page 122

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PC7
PCI
PCO
MIDI CLOCK
MIDI
IN
MIDI
OUT
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PCB
Serial
data informations
from
other instruments
comes
in
from MIDI-IN
terminal
and
enters
MAIN
CPU's PC1
terminal
via
photo
coupler
PC900.
Thus, CZ-1
is
not
electrically
connected with any
external instruments to cut
electric noises.
Input
signal also
goes
out
MIDI
THRU
terminal through
a
photo coupler
and two
inverters.
MAIN CPU
transr-
's
MIDI
data
from PCO
terminal.
-58-