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Marantz SD9000 - Page 9

Marantz SD9000
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(2)
Indication
signal
—
1
This
signal
is
delivered
from
input/output
ports
C
and
D
and
output
port
E
to
drive
the
7-segment
LED,
PM
LED
and
OVER-FLOW
LED
in
the
display.
For
ex-
ample,
the
following
steps
are
taken
for
the
display
to
indicate
‘’1:24’’.
Refer
to
Fig.
2.6.
a.
Strobe
signals
(1)
through
(4)
are
output
from
output
port
E,
lighting
the
7-segment
LEDs
one
by
one
starting
from
the
top
digit.
b.
The
7-segment
lamp
signals
are
output
from
output
ports
C
and
D.
c.
The
lamps
of
all
the
digits
wil!
light
in
sequence,
but
they
appear
to
light
simultaneously
because
the
driv-
ing
cycle
is
very
short.
Fig.
2-6
Principle
of
displaying
“1:24”
a7ol-15
C+)
a70i-14
@
area
®
a70i-12
@)
Q70I-2_
EE
(a)
Q70I-3
Fb)
Q70I-4
G
{c)
“Q70I-5
H
(d)
Q70I-8
A
(e)
Q70l-9
B
(tf)
Q70I-1I0
C
(g)
Q7ol-tt
O
()
(3)
Indication
signal
—
2
The
LED
lamp
signals,
used
to
indicate
the
mode
of
operation
of
the
microcomputer,
are
output
from
out-
put
port
F
and
output
port
G
(excluding
Pin
22).
The
conditions
required
to
light
the
LEDs
are
given
in
section
5
‘‘Programming”’.
The
Q702
and
Q703
(uPA57C)
are
wired
as
shown
in
Fig.
2.7
to
serve
as
a
buffer
driver.
Fig.
2-7
uPA57C
4
13
2
wu
0
9
8
Tag
GND
MPAS7C

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