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Keyboard Circuit - Samsung ER-220 Service Manual

Electronic cash register
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4-7
KEYBOARD CIRCUIT
Key
scun
is completed
by
applying
the scan
signal
on
the address
line
and
the
return
signal
on
the data
line
of CPU
through
key
switch
and
74HCTLS541.
41
wT
Ww
Yu)
—J
a s
~
O
x

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