2)
Add
a
jumper
wire
onthe
power
supply
circuit
board
inthe
PSC
box.
(a)
Remove
the
power
supply
circuit
board
from
inside
ofthe
PSC
box
in
accordance
with
"replacement
of
power
supply
circuit
board
assembly
A , or
assembly
B
shown
on
page
57of the
Enginner's
Manual.
(b) Fit a
single
copper
wire
00.5to 01.0inthe
position
indicated
as
W8
on the
electric
circuit
board
and
solder
it.
(c)
Re-install
the
power
supply
circuit
board
inthe
PSC
boxinthe
inverse
order
of
removing it.
(When
a
jumper
wire
is
added,
a
diode
isnot
required
to be
attached.)
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REV
(8) Test program selection
Anyof 3 test
programs
canbe
selected
by a
combination
of
SW3-6
(TEST
A)and
SW3-7
(TEST
B)
settings
asin the table below,(refer to Table4-7).
Table
4-7
TESTA
TESTB
Test
Applicable units
ON
OFF
Speed
test
(SC-320 indicates rpm)
SC-20,
120,220,
320
OFF
ON
Switch
input
test
SC-320
(but
applies to all units if an SC-320 is
used as the checker)
ON
ON
Synchro test
SC-320 (but applies to all units if an SC-320 is
used as the checker)
*
Make
sure
TEST
P is
OFF.
★
Speed test program
This
testis
used
to
make
certain
adjustments
such
asthe
low-speed
rpm
and
automatic
reverse
stitching
rpm.
Five
different
speeds
canbe adjusted by repeatedly
depressing and releasing the pedal, as shown in
Table
4-8.
The
speeds
areadjusted as
shown
in
Fig.
4-7,with
the 4
potentiometers
on the main circuit board
inside
the
PSC
front
cover.
Fig.
4-7
-
35
-
BT
SOFT
LSH
LSL
Reverse feed speed
Soft
start
speed
Pedal minimum speed
Thread trimming speed
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