machine. Please follow the procedures as outlined in the INSTRUCTION BOOK on DDL-552, 553
and 555, DLN-4I5, DLU-450 or DLD-432. However, please note
attachedtothis
the
thread
tension (Fig.28)
Adjusting the thread tension of this machine is exactly like a conventional lockstitching
that
due to the thread trimmer
machine,
the
adjustmentislittle
different
than
other
lockstitch
machines.
First
tension
disc
WeakIStrong
(Adjusts
the
thread remaining at
the
trimming>
length
needle
eye
after
(D
(4)
Strong
w
Second
tension
Weak
(adjusts
tention)
the
disc
thread
of
i
Fig. 11
-
13
-
Fig. 12
Page 16
1)
Thread
When
take-up
causing
thread.
the
becomes
spring
skip-stitching
Be
2) Adjusting the first thread tension disc
*When
needle
*For fine threads (synthetic
3) Adjusting the second thread tension
*
Normally,
*
the thread might break at the start of sewing.
4) Adjusting the
The
ing
machine.
causing
the
breakageorslipping
*Asa rule, this
idle
spinning
7.
Adjusting
After
the
standard
control
red mark on the arm and the white mark on the hand wheel are matched with each other.
box)toright
If the
standard
will stop below the standard stopping position (in case of B).
* If the thread should slip out even if the length of needle thread isadjustedafter the thread
is trimmed, rotate the adjusting knob toward the
* If the needle should hit the wiper, rotate the knob toward the "FAST" direction, (toward
[A]
direction).
(Caution)
If the
sometimes the machine does not stop. In such a case rotate the knob toward the "FAST" direction.
take-up.^ring
fine cotton thread or synthetic
may
become
extremely
the tension of the firstthread tension is madestronger,the threadremaining at the tip of
eye
longer.
However,
adjustment
careful.
becomes
the adjustment of this
please
However,
needle
threadto"float"upat
of the
the
needle
the thread is
needle
adjusting
stopping
position
adjusting
too
strongorthe
just
before
the
shorter
note
bobbin
of the
if the
outof
machineisused
bobbin.
stop
stop
and
after
fiber),
that
when
thread
bobbin
tension
the
needle
(Part
number
position
trimmed,
position,
rotate the
leftso that,after the
knobisrotated
(in
caseofA)
knob is rotated too
threads
rangeofmovementofthe
machine
stops
trimming
weaken
discissame
synthetic
tension.
thread
tensionispractically
istoo
weak,
the
thread
at thestartof
with a bobbin
is D
after
thread
this
machine
needle
toward
and
much
the
ifit's
(tetoron,
and
and
when
the tension and for thick thread,
threadisused,
the
bobbin
startofsewing,
1837555
trimming
can
position
threadistrimmed
"FAST"
rotated
"SLOW"
toward
nylon
eic.)arc
sometimes
it is
as any other lockstitching
the
made
ifthe
sameasany
might
spin
and
sewing
caseinwhichamagnet
BAO
and
might
sold
used,
spring
may
machine
weaker,
tensionisadjusted
conventional
idly
at the
for
synthetic
occur.Bevery
separately)
(Fig.13)
change
the
needle
stop
position.
adjusting
direction,
toward
direction, (toward [B] direction).
the
"SLOW"
knob
(I)
and
the
needle
the
needle
the
"SLOW
direction (towardBdirection),
the
tension
become
does
not
the
remaining
make
it stronger.
machines.
trimming
threads,
is built-in to
To adjust to
(on the
has
stopped,
will
stop
direction,
too
trim
too
lockstitch
careful.
side
above
the
of the
wide,
thread
weak,
instant,
thread
prevent
of the
needle
the
the
the
IB)
[A]
^^"FAST"
"SLOW"
Adjusting
)iiiii)ii)i
knob
Standard
stop
position
i/mmn
Throat
needle
plate
Adjusting
knob
Fig.
13
-
14
-
Page 17
8. When low speed cewing is
not
necessary (Fig.14)
* Be sure to cut off the power and makeadjustment.
at
the
startofsewing;
(T)
Cut off the power source.
(D
open
the cover of the control box.
(3)
Pull
function.
Thus,
out the
the low
inserted
speed
® of the
sewing
figure
function can be eliminated without affecting the thread trimming
n
Fig.
from
the pin
14
When
fg)
and
low speed
insert
sewing
is not necessary
it into the pin (0.
9. Carefully
note
the following points
* Be certain that the needle thread comes out smoothly from the thread spindle.
(Otherwi.se,
the remaining thread at the needle eye after trimming will become short and thread slipping out
might
result.)
* When skip-stitching occurs, the bobbin thread may break but the needle thread docs not
break. In such a case, re-adjust the timing of the needle with the sewing hook.
10.
How
to selectthe
1) Presser footSelect small a and b parts (Fig.15)
2) Throat plateSelect small needle eye and A part.
3) NeedleFiner needle for less thread slippage
4) Sewing hookAutomatic lubricating hook with a groove
presser
foot, throat plate,
sewing
hookandfeed dog
5) Feed dogIf a feed dog which is commonly used is adopted, there is no problem,
but if an extremely thick feed dog is used, the backside of the dog teeth might be scratched when
the moving
knife
1)
2)
Presser
Throat
moves fully.
foot
plate
}
Na
Fig.
15
-
15
-
Page 18
IV.
ADJUSTING
THE
MACHINE
This machine consists of lockstitching part and the thread trimming part. The lockstitching
function is same as all
other
previous models, so this text will cover the thread trimming part only.
1. Adjusting
the
timingofthe
indicated
before
cam
roller
that
condition,
hand
the
1)
Howtojudge
In
order
lineonthe
Tilt
the
the
upper
(Fig.
wheel
will
matchedsothat
(Fig. 18 (D)
are
indicating line
synthetic
thread.
timingofthe
the
to change
thread
hand
machine,
dead
point
17) will
rotate
the
cometoa
the
indicated
matched
(Fig.l8
(D)
thread
trimming
correct
the
trimming
wheel,
turn
enter
hand
timingofthe
lengthofthe
cam.
accordingtothe
the
hand
andifthe
the
point
sewing
cam
grooveofthe
wheelinthe
where
wheel
lineofthe
togetherasshown
is matched with
cam
trimming
thread
This can be
with
hook
reverse
it will
not
arm
(Fig.18 (D)
in Fig. 18, it
the
indicating line
Thread
cam
cam
remaining at
done
the
easily by
kindofthread
your
hand
until
presser (Fig. 16 (D) is
cam
(Fig.
17)
direction
rotate
than
any
more.Atthis
and
the
becomesacotton
(Fig.l8
trimming
needle eye
used-cotton
the
and
the
after
matching
thread
pushed
will be
interlocked
conventional
trimming,
the
arm
or
synthetic
take-up
deeplytoright,
way,
pointifcam
indicated
lineofthe
thread
hand
timing. But if
(D), it becomes a timing for
Rotational
direction
Mil
with
comes
there.
and
timing is
adjust
the
thread.
just
the
In
the
wheel
the
2)
Howtomatch
First,
No.2,
and
cotton
thread,
the
green
Then,bypushing
roller,
and
normal
not
finally
hook
rotate
tighten
loosen
match
color
without
any
Fig. 16
match
(D),
shaft
more,
the
DLD-4322
the
timingofthe
the2set
the
screwsofthe
indicating
red color (i) with
(Fig.
18)
the
sewing
rotating
the
rotational
push
the
cam
set
screws
lineofthe
hook
hook
direction
cam
(Fig.
Cam
roller
Cam
roller
set
screw
trimming
cam
with
the
shaft
cam
(Fig.17) in
indicating
arm
thread
trimming
arm
the
red color (D and for
presser (Fig.16 (D)toright,
shaft,
rotate
the
cam
only
with
your
finger tips. At
against
17)inthe
the
thread
orderofNo.2
-
16
trimming
-
synthetic
toward
the
cam
and
Rotate
direction
Fig.
17
order
from
lineofthe
thread, red
interlock
the
reverse
position
thrust
No.l.
caminthis
with
hand
set
screw
hand
the
cam
direction
where
collar
wheel.
color
and
the
(Fig.
No.l
(I)
the
than
cam
17)
Set
Thrust
screw
and
(For
with
cam
the
does
and
collar
No.2
Page 19
2.
Adjusting
shown
centerofthe
needleorbobbin
knife
knife
1)
The
in Fig.l9,
might
correctly.
the
correct
hit
Green
positionofthe
positionofthe
when
the tip of the
needle.
When
threadatthe
each
other.
moving
the
retreated
trimming
Therefore,
knife
moving
moving
range
instant,
it is
knife
whenithas
moved to
its
maximum
knifehasretreated to 2~2.5mm(l/6"~3/32")
is less
than
this
whileifit's
very
important
position,itcannot
too
much,
to
match
2
~2.5mm
the
feed
the
positionofthe
dog
scoop
and
range is, as
from
the
up
the
the
moving
moving
Needle
Fig. 18
Moving
knife
Fig. 19
2) How to match the position of the moving knife
This is adjusted by changing the right or left position of the moving knife shaft (Fig.20
®)
when the machine stops. By this adjustment, the interlocking of the cam and the cam roller also
changes, so match the positionofthe thread trimming cam toward the shaft direction, also.
a. First, loosen the magnet set screw (Fig.20 (D and pull
b. Move the magnet link (Fig.20 (£)) downwards and adjust the .screwed-in
out
the magnet link pin (Fig.20 (D).
amount
of the knife
moving shaft adjusting nut (Fig.20 (D). If this nut is screwed in deep, the retreating range of
th the knife becomes greater and if it's loosened, the range gets less.
c. Loosen
both
set screws of trimming cam
(7)
and the thrust collar (6).
d. Match the indicating line of the hand wheel with the indicating line of the arm.
(2)
(In case of cotton thread, match (D with
of Fig.18 and for synthetic thread, match (D with
e. Rotate the set screw No.2 (Fig.20®)(indicated point) of the trimming cam so that it comes to
front and when it comes to front, push the sewing hook presser to right.
f. Move
the
cam to right and left
and
interlock
the
cam
and
the
cam roller.
g. With this condition, as you pull the cam to right, move it toward teh arrow direction until the
cam
cannot
h.
Temporarily
i.
Tighten
j. At this
(D
Is the indicating line of the pulley matched?
(2)Isthe
rotate
anymore.
the
point,
tighten
lock
nut.
verify
the
(Fig.20
the
set
screw
(D)
following:
No.2(Dof
the
roller inserted smoothly into the cam groove?
cam.
(DIs the retreated range of the moving knife 2~2.5mm?
k. Tighten the two set screwsofthe cam securely.
1.
Push the thrust collar against the cam and tighten the two set screws,
m. Attach the magnet link pin in its original position.
(3))
-
17
-
Page 20
The simple
step
partofthe
parallel,
(Note)
1) No
the
the
matter
retreating
2) Verify if
methodtojudge
bed and
positioniscorrect.
how slight
rangeofthe
the
moving knife disposes
the
the
the
correct
forked baseofthe
position of
the
moving knife would be to verify if
knife are paralled to
each
other.Ifthey
the
are
right or left position adjustment may be, it has a big bearing on
moving
knife.
the
thread
properly as shown in Fig.21.
s
0
3. HowtoInstall
The
correct
®(2)(3)®(4
the
fixed
knife
correctly
methodofinstalling
wism
the
0
fixed
knifeisshowninFig.22.
Fig.
Fig. 21
The
20
standard
distance
from
the center of the needle to the tip of the fixed knife is 4.2mm(5/32"). The tip of the fixed knife
shouldbe0.6mm
When
the
cutting
the
cutting
be
changed,
installation
above
the
the
angleofthe
partofthe
power
be sure to verify
(Fig.22A).
fixed
becomes
installing
installing
knife
most
powerful.
the
sharpnessofthe
surface.
fixed
and
the
(Fig.23).
knife's
moving
When
tipischanged,
knife
is precisely
the
fixed
knifeistobeadjustedorwhen
blade
andatthe
the
same
cutting
matched,
time,
power
then
adjust
changes. When
and
only
then
it is
the
angle
to
of
18
-
Page 21
Movingknife
Lower
of
throat
part
plate
Needle
a
ShorterLonger
Length of remaining thread
after trimming
Fig.
22
i.5bb
Graded
of
bed
(Note):
part
0.6mm
DLN-415-2
Set
the
feed adjusting dial to
Fixed
Fig.
knife
23
The fixed knife can be installed by moving it to the right of the standard installation position.
In that case, the length of the remaining thread of needle thread and the bobbin thread not
only gets longer by the distance the fixed knife has
moved,
but
because
the timing of the
trimming also is delayed which makes the length of the thread at the tip of the needle eye
much
longer
(Fig.25)
In the case of synthetic thread, move the fixed knife to right to delay the timing of the thread
trimming. However, to make the adjustment complete, it is alsonecessaryto adjust the timing
of
the
thread
trimmer.
(Chapt.
IV-1).
"0".
4.
The
floating
1)
At
rangeofthe
Howtoverify
the
position
the
where
second
floating
the
take-up
thread
range
has
tension
come
disc
just
before
the
upper
dead
foot and when the hook thread presser (Fig. 16 (D) is pushed hard to right, verify
the D side of Fig.28 does not cut well,shorten the angle and when the C side
make
the
angle
corners
tip
surface
of the
the
(Fig.27)
weak
knife
larger.
fixed
fixed
blade
surfaceofthe
when
even
and the
Fixed
knife
greatly
knifeand the cutting
affects
moving
and
cutting
the B
though
fixed
the
moving
knife
becomes
surface
the
blade
knife
is not
fixed knife.
and fixed knife,
Moving knife
the
cutting
becomes
knife
should
better.
(Note
tipissagging
tips
are
sharpened,itis
contactingtoright
change
power
and
the
sharper.
contact
the
angle
blunted.
angle
ofthe
knife.
the
blade
shown
So,donot
because
andleftat the
of the arrow
Fixed
In
of
by
the
knife
Fig.
27
Changing
the
moving knife
To change the moving knife, do as follows:
1)
Loosen
pin
2)
Remove
and
the moving knife from the knife forked base.
3)
Move
screw
the
(Fig.32
the
the
moving
the
(Fig.3IB).
knife
(D).
moving
knife
forked
knife
knife
forked
For
Fixed
base
hinge
(Fig.30
basetothe
this
purpose,
Fig. 29
knife
pin
(D)tothe
set
screw
position
use
screw
(Fig.32®)and
(Fig.30
®),
position
showninFig.31B
the
special
C&D
partsofmoving
should contact each other at the same time
Fig. 28
pull
out
the
knife
knife
and
forked
fixed
..•
move
the
knife
forked
showninFig.31Aand
and
remove
spanner
in the
accessories
base
remove
the
knife
box.
(Fig.30
the
knife
base
/-n
(D)
pin
ol
hinged
Fig.
30
-
20
-
Page 23
move
knife
the
the
N(
Knife
forked
base
Moving knife
For
installing
the
moving
forked
forked
base). When
base.
Fig.
back,
reverse
knife
with
base to
the
position
(If
the
knife
the
shaftismovedtoright,besure
the
your
hand
showninFig.31C
moving
Knife hinged
Moving
/
31A
Knife
above
and
shaft
forked
screw
knife
procedure.
see
if it
is moved to right or
base
Fig.
moves
and
to see
31B
After
firmly insert
that
the
smoothly
the
knife
knife
hinged
without
the
knife
left,
the
movestoright,
Knife
Moving knife
screwistightened,
any
rattling.
forked
base
pin will go in
also.
forked
base
Fig.
31C
Match
pin
deep
the
into
into
7. Adjusting
the
bobbin
thread
presser
If the bobbin thread presser (Fig.32 (3)) is penetrating too deep toward the bobbin case at the
trimming time, the bobbin will not rotate and the bobbin thread will be trimmed too short, causing
thread
slippage at
the
startofsewing.
On the contrary, if it is not inserted deep enough, the needle thread will slip out from the tip
of the bobbin thread presser at the trimming time, shortening the thread remaining amount at the
tip of the needle eye after the trimming and invites thread slipping out.
1) The correct position of the bobbin thread presser
When the thread trimming lever is pressed hard against the stopper side, the bobbin thread
should be pulled out easily. At this position, the clearance between the tip (Bobbin presser) of the
bobbin thread presser and the upper carved part of the bobbin should be 1.5~2mm asshown in Fig.47.
1.5
~2mm
a
Fig.
DLD-432'2
32
V
Fig.
33
2) How to adjust the bobbin thread presser
Loosen
ond
down.Atthis
the
position
After
shaft is not contacting the bottom of the
contacting, refer to the chapter on "Adjusting the
shaft
collar.
the
screws
instant,
of the
adjusting,
(Fig.32 ®), and adjust by
adjust
the
fore
thread
trimming
tighten
the set
stopper
screw
and
arm
of the
cam
aft
moving
position
(Fig.26
the bobbinthread
ofthe
(D).Asshowninfigure.
stopper.Besuretoverify
-
groove
21
slide
-
when
the stopper is
shaft" and
bobbin
re-adjust
presser
in and out or up
thread
presser
that the tipofthe
deeply
the positionof the
and
inserted. If it's
adjusting
roller
slide
Page 24
8.
Adjusting
The
the
moving
slide
range
shaft
of the
slide
shaft
(Fig.34
®) is
5.4mm(7/32").
Thisisadjustedbymoving
the slide collar (Fig.34 (D) toward the shaft direction. Also, the position of the cam roller shaft arm
(Fig.34 (D) should be 13.5mm(33/64") as
*
The
adjusting
procedure
is as follows:
showninFig.34.
(D Determine the position of the thread trimming arm stopper depending upon the position of
the
hook
thread
presser.
(D Adjust the position of the slide collar so
that
the moving range of the slide shaft comes to
5.5mm(7/32").
(D Adjust the position of the thread trimmer magnet (DC solenoid).
When
the
thread trimming arm has moved to
the
position were it is almost touching
the
stopper,
adjust the position of the thread trimming magnet so that the snap ring which is attached to the
thread trimming magnet plunger hits the rubber ring and stops and also when the magnet is pulling,
there
shouldbeno
clearance
between
the
two
endsofthe
rubber
ring.
E
20mm
13.5mm
Fig.
34
9.
Howtoinstall
To remove
®Take
(D Loosen the knife forked base (Fig.35 (D), and pull
(D After removing
hinged screw
base
will
come
and
the
remove
knife
the
installing base (Fig.35
out the sewing hook.
the
hook
(Fig.35
®)
knife
off.Toinstall
installing base set screw
back,
knife
installing base
thread presser link hinged screw (Fig.35 (D), and if
reverse
this
®),
do as follows in
order.
out
(Fig.35
Fig.
order:
the
knife forked base pin
(D) is pulled
out,
35
the
the
hook
knife
(Fig.35
presser
installing
(D).
Page 25
10. Adjusting
This synchronizer has adopted semi-leading element, non-contacting type called hole IC, so it
is impossible to verify the position of the synchronizerby the tester by pulling out the 12P
Therefore, the position of the synchronizer should be adjusted in the following order:
®
(D
(DTurn
®
(D
the
position of
Remove
Remove the cover ® of the synchronizer and loosen the screw
Match
If the
the
belt.
the power source switch to
the
black
synchronizerismoved
the
synchronizer (Fig.36)
"ON".
indicating lineof the
gently
pulley
withthe redindicating lineof the
by the
hand
without
moving
®.
the
pulley,
machine
the
auxiliary
plug.
head.
motor will either rotate or stop. So, at the position where the auxiliary motor has started to stop,
position of the knife shaft and thread trimming cam
inadequate).
*
Due
to using
undesignated
* Incorrect installed positionoftrimming switch
sewing
hook
* Inadequate contact and functioning of thread trimming
components
' Inadequate connection of the cords to (he trimming
components
' Voltage is too low.
*
Faulty
' Motor lever
conditionofthe
returning
clutch
spring is too weak
plateofthe auxiliary
motor
CO
Verify
the retreating amount of the
of
the
trimming
(5/64"
~3/32").
CO
Inspect and see if the sewing hook is equipped with a bobbin thread guide
groove and if
(0 Step on the pedal to the rear and verify the workingsound of the thread trimming
magnet. If the
CO
In the case of HITACHI motor, screw-in the thread trimming adjusting screw, and
verify
the
In
the
caseofNATIONAL
cam so
not,
change the sewing hook.
sound
can
moving
soundofthe
not
motor,
that
the
be heard;
switch.
exchange
moving
knifeand adjust the left-rightposition
retreating
the
amount
switch.
comes
to 2.2.Smm
® Inspect the continuity of all parts by a tester and measure the resistance value,
a. Inspect the
thread
trimming
switch.
Inspect the conductivity between the No.4(red) and No.6(blue) pin terminals of
12P plug and if at the pedal
stopping
position there is no
conductivity
but
there is
conductivity when the pedal is stepped to rear (thread trimming action), it is
5n,
normal. When the resistance value al conductivity time is
(1) Inspect
the
thread trimming magnet.
exchange it.
Measure the resistance value between No.2(black) and No.5(brown) pin terminals of
the
I2P
a.Ifthe
plug coming
resistance
out
is 11 n
from the
...
machine
it is
head,
normal.
* If the resistance is oo ... inspect the wiring and if the magnet is di.sconncctcd,
exchange it.
* When
the
.shorted inside the magnet, exchange the magnet. After that if the magnet is
resistanceisOn
condition, exchange the Tr23. At this point, inspect the
UJ)
Tighten
the
belt
somewhat.
...
inspect
and
sec if
the
circuitisshorted.Ifits
033.
"ON"
(.0 Inspect the voltageofthe power source.
(2) Tighten the hinge
nut
at lever
returning
spring gradually, little at a
time.
3)
The
.sound of magnet is
heard
not
trimmed
but
the
thread
is
I. Insuffieient retreating
range of the knife or the
moving knife
is
brokenorinsufficient
trimming power
2
The
and
interlock
thread
the
rollerdonot
forked
trimming
base
cam
*
The
right
and
inadequate
'
Faulty
*
The
screwsofthe
are
loose
* Installationofparts
magnetisfaulty
left
timingofthe
positionofthe thread trimming cam is
thread trimming cam
slide
shaft
collarorthe
which are moved by
cam
the
* The knife moving shaft adjusting nut screw is loose
roller
trimming
arm
Remove the needle plate and inspect and if the thread is not trimmed when
thread trimming operation is
retreating range of the moving knife or insufficient trimming power
(D
Inspect
the
knife
driving
shaft
performed
adjusting
by the pedal, it is becauseofinsufficient
(IV-5,
nut,
slide
shaft
collar
and the
arm not screwsfor loosened condition and correct them to the right positions.
@
Inspect
and
see
if the
within
the 60°
zone
trimming
of the
main
arm
shaft
moves
rotating
smoothly
angle
when
until
the
it hits
needle
the
tip
from the needlehole of the needle plate. If it doesnot movesmoothly,verify first
if the retreating
and left position of the cam
(D
Adjust
the
hand
wheel
timing
(IV-1).
range
of the
of the
thread
moving
(IV-1).
knife is
trimming
cam
adequate
and then adjust the right
with
the
indicating
point
cam
slips
6).
roller
stopper
out
of the
-
30
-
Page 33
Malfunctions
Causes
OrderofInspection
and
Corrective
Measures
I. Machine does
at the
uppei
position
(The
stopping position
the
needleisnot
not
stop
or lower fixed
of
definite)
1. Auxiliary drivingdevice
of the motor or the special
functionofthe
not
working right
brake
Insufficient voltageofelectrical source for the
is
auxiliary motor device or wrong connectionofthe dis
connecting
a) When connecting the electrical cordofHITACHI motor
b)
The
Auxiliary
Defective bi-directional-triode thyristor
cord
to the transformer of the control box, the method
connectioniswrong
The
fuseofthe
magnet
control
brakeofthe
motorisdefective
boxIsblown
motor
is defective
out
brake
and
(D
Inspect
(D
of
(D Put out all the input cords, once, and correct the insertions.
(D Inspect the
®
(D
®
the6Aand1A
Check
the
of
between
of the input cord to the transformer is wrong, so correct it.
Remove the cover of the magnet brake and adjust so
the brake plate and the brake friction plate becomes
refer to Instruction Book of Hitachi and National motors).
Inspect
plugging cord inside the control box, measure the resistance between the No.3
(red lead wire) and No.4(yellow lead wire) and if it's
connected
magnet
Remove
the end
terminal (3 ea. of 3 phase, 2 ea. of single phase) of the cord which is connected
to the
by a tester. If the resistance is
coil or
Also,
are matched to show the resistance indicator points to "0".)
Verify
connected
from
measure
voltageofthe
alternate
0 and 3IV is 25~37V, it is
clearance
the
disconnectionorshorting
or shorted and if the connection of the cords is nonnal,
brake.
the
black
cover
auxiliary
shorting.
the
tester
that
the
to theON'
the
motor,
the
voltage
meansoftester
bi-directional-triode
No.8(grey)
and
bi-directional-triode
thyristor.
(D
When
the
triode thyristor or running with defective phases(of 3 wires, 1 wire isdisconnected
or
®
Step
and No.l(white) and if it's "0", it's ok and
(grey)and No.9(orange) is "0", it's ok andifany terminals show
it
thyristor.
(Note) The
auxiliary
defective
connection)
on the
pedaltolow
means
defective
inspection
condition, so be extremely careful not to receiveelectric shock. Also,do not
forget to set the rangeofthe tester to AC250V.
fuses
andif
blown
switch
current
of the
of the magnetbrake.
capofthe
of the
motor,
motor and
(Be sure to
should
measure
low
speed
side.
input
the
between
AC250V
thyristoris
No.9(orange)
function
range.
transformer
tipofthe
also,
measure
"0"or<»,
measure
so that
Flip
upthe
current
the pin
If the
defective.
terminals
part
and by
changing
(pedalIsneutral
voltageisover
in the
thyristorisdefective,
motor is
abnormally
speed
sewing
and
bi-directional-triode
of ® will be conductedwith the powersourcein
out,
replace
them
with
and
if it is
inside
the
normal.
If not, the
of the
magnet
cord
coming
removing
the
conductivityofrespective
it means disconnection of the motor
the
resistance
when
2 test
pins
new
normal,
measure
control
box.
connecting
that
the clearance between
O.Smm.
(For full
brake.
Pull
"0"
orthey are dis
out
from
the
the
vinyl
cover
within
the rangeof R x 1.
are
contacted
pinontopofmother
black
cap
atthetipof the
and
terminals
No.l(whitc)
40V,
With
the 3
phase
same
manner
so in
cither
case
heated,itmeans
measure
the
voltage
similarily
if the
thyristor.Insuchacase,
cord
machineisstopping)
and
it isokbutifit's
motor,
measure
andif not
exchange
defective
between
voltage
voltage
ones.
the
If the
out tlie
exchange
motor,
of the pin
pin
terminals
that
printed
board
coming
No.2(black)
OV,
between
over
40V,
the
defective
bi-directional-
No.2(b!ack)
between
of over40V,
exchange
turned-on
voltage
voltage
method
dctail.<i.
black
the
remove
tl>cy
is
out
and
by
the
the
No.8
the
- 31
Page 34
Malfunctions
Causes
OrderofInspection
and
Corrective
Measures
J. Kvcn when (he pedal is
set at stopping position,
the
machine
runs
low speed
at
2.
Malfunctionofsensor
components
1.
Inadequate
low speed sewing switch
2.
Connector
3.
Defective
motor
adjustment
is pulled
brakeofthe
magnet
out
• Motor lever returning spring too weak or too much
clearance between the worm gear of low speed rotation
or brake lining of (he hand wheel gear and the clutch
plate
' Malfunction of needle positioning sensor
a. Inadequate contact of the cord connecting the sensor to
the
control
box or wrong connection.
b. Defective connection of the electrical wiring from the
control box to the transformer or inadequate plug-in of
3P
connector.
c.6AandlAfu-sesofthe
of
control
box
blown
out.
i) Rotate the
machineathigh
speed,
release
your foot
from
the
pedal
same time lift up the motor lever and if the machine stops at this time, the
above-stated spring is
too
weak.
a. In the case of HITACHI motor, tighten the motor lever returning lever
adjusting screw and make the spring stronger.
(D In the
(1)
(2) Inspect and see if the fuse is disconnected or not.
(D
caseofHITACHI
screw of the gear head part to lessen the moving range of the motor lever.
motor
and
NATIONAL
motor,
screw
in the
Inspect the wireconnectionof powersource to the control box.
Remove
the beltof the
machine
from
the
pulley,
turnoverthe
grey
capof the
connector, turn the power switch on and while measuring the DCvoltage between
the No.l(white) and No.6(blue) terminals with the direct wire lOV range (black
lead rod to No.6), rotate the pulley with the hand and if the voltage is
the
synchronizing
condition
the needle of the tester should remain showingOVor SVeven once, verify the wiring
connections and they are not in error, exchange them.
'D
When
the
part
can
not
zone
between
No.4(yellow)
pedalislightly
be heard,
and
shows
and
stepped
adjust
on and if the
the position of L.SW.
5V at
No.6(blue),
other
areas,
it's
it's
normal. But in
moving
normal
sound
OV
andifit's
either
of the motor
and at the
adjusting
12P
between
.same
case, if
lever
Release the plugged-in cord of the motor lever and while lowering or separating the
motor lever lightly, inspect the continuity between the cords V3(red) and Y7(grey)
which
come
out
from
the
motor
brake
lever.
"OFF",
exchange the switches.
between
X3- X4
tcrininal.s.
If they do not become "ON" or
(X)
Verify the plugged-in condition of the 12P connector and 9P connector (blue).
X)
Readjust
the
clearance
(D
Inspect
the
wiringtomagnet
of the magnet brake.
(D Inspect the conductivity of the magnet brake of motor and if resistance is about
90n
(Hitachi),
® Exchange the magnet brake.
60f2
(National)
itsokif
not,
K.
Needle
breaksat(he
startofsewing
Unusual
from the bed part
soundisheard
4. Inadequate adjustment
stop
position adjusting
knob
I.
Malfunctionofthe
movementofthe
device
safety
of
*
Safety
magnet
cord
is disconnected.
D Try to rotate the adjustingknob toward the "FAST" direction and see.
® Inspect the cord of the adjusting knob inside the control box.
Remove the needle, step on the pedal to rear and when the pedal is stepped on to
the front quickly,verify to seeif the pedalcannot besteppedon before thestopping
position, (National) or becomes idle stepping (Hitachi).
If it can be stepped on, adjust the safety device stopper.
® Verify and see if the
moving
sound of the safety magnet can be heard at the
trimming time. If it cannot be heard, re-adjust the installed position of the safety
lever so
that
the
®
®
Re-adjust
Measure
movementofthe
the installed positionof the pedal
the
resistance
of the safety
safety
lever will
connecting
magnet.
become
When
rod.
the
smooth.
resistance
between
terminals Y2~Y5 of the 9P plug is 0 orthe connection is bad or the safety