3)
Adjusting
variable
resistors
on
the
main
circuit
board
and
adjustment
range
table
Table
3-1
below
shows
the
adjusting
variable
resistors, adjustment
ranges
and functions.
Table
3-1
VRNo.
VR
symbol
Function
Adjustment
range
VRl
BT
Used to control the reverse stitching speed at sewing start/end.
The
BTVR
alone
controls
both
BTL
and
BTH.
(The
difference
is always
200spm.
1000
~
3500
spm.
_ . ,
BTL
ITOOspm.
Standard:
i900spm.
Counterclockwise:
Decreases
Clockwise:
Increase
Pi
VR2
SOFT
Used to adjust the speed of soft start for ensuring interlaced
threads
of
beginning
stitches.
200
~
2000spm.
Standard:
SOOspm.
Counterclockwise:
Decreases
Clockwise:
Increases
>
00
.c
at
a
'5'
a
•a
4>
VR3
LSH
Used to increase the sewingspeed in the lowest speed sewing
mode actuated by pressingthe front part of the pedal.
LSL
~
+200spm.
Standard:
200spm.
Counterclockwise:
Decreases
Clockwise:
Increases
o.
OT
VR4
LSL
Used to adjust
the
running speed
of
the
sewing machine at the
time
of thread trimming which requires to be performed at low
speed regardless of the speed control function of the pedal.
Normally,
it
is
fixed.
(If
the
LSL
is changed,
the
LSH is also
changed.)
150
^300
spm.
Standard:
Fixed
to
200spm.
Counterclockwise:
Decreases
Clockwise:
Increases
VR
5
MIN
Used
to
change
the
accelerating
point
from
low
speed
by
about
1 mm
(0.039")
through
pedal
stroke.
About
1
mm
(0.039")
Standard:
Fully
clockwise
Counterclockwise:
Low
speed
stroke,
long
Clockwise:
Low
speed
storke,
short
Pi
>
00
c
VR6
FLSW
Used to adjust the position where the presser foot is raised
by depressing the back
part
of tlie pedal in a version with
AK-31, AK-34.
Standard:
Refer
to
P.25.
Clockwise
:
Increases
stroke
Counterclockwise:
Decreases
stroke
at
p
•a'
C3
V
o
at
£
VR
7
TSW
Used to adjust the position where tlie thread trimmer is
actuated by depressing the back part of the pedal.
Standard:
Refer
to
P.24.
Clockwise:
Increases
stroke
Counterclockwise:
Decreases
'
stroke
VR8
LSW
Used to adjust the stroke for starting sewing by depressing
the
front
part
of
the
pedal.
Standard:
Refer
to
P.24.
Clockwise
:
Increases
stroke
Counterclockwise:
Decreases
stroke
-
23
-
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