Switch
input test
program
(using
SC-320
panel)
This
isa testof
whether
the
various
input
switch
signals
are
being
correctly
read
into
the
PSC
box
microcomputer,
using
the
SC-320
indicators
to
check
(while
testing
isin
progress
the
sewing
machine
will
notrun;
this
isnota
malfunction.)
Fig.4-8 shows which
signal
appears on eachindicator.
n
n
1 /
u
u
u
a Switch input status indication
0 :
OFF
1 ;
ON
b Test program indication
Fig.
4-8
nn
uu
HD^EB9ii
c
Data
select
No.
c
00,
01,
2 3
]
Note)
To
change
the
data
select
No.,
turnthe
upper
detection
signal
ON/OFF
by
turning
the
sewing
machine
pulley by hand.
Table 4-9
gives
the list of switches for which the input can be checked.
Among
these,
data
select
No
04 to 09 are
switches
onthe
SC-120
and
SC220
control
boxes
(the
SC-320
panel
switches
cannot
be
checked).
When
a
check
is
necessary,
while
the
SC-120
or
SC-220
is
being
used
open
the
PSC
boxfront
cover
and
plug
the
SC-320
connector intoconnector J6l
(SC-320)
on the
main circuit board. The
SC-320
will function as an input checker.
Fig.
4-9
-
37
-
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