JUKI IP-100 Quick start guide

ENGINEER’S MANUAL
40011067
No.E355-00
Computer-controlled, Direct-drive, High-speed, 1-needle,
Lockstitch, Zigzag Stitching Machine
LZ-2290A Series
IP-100 / SC-915
R

PREFACE
This Engineer’s Manual is written for the technical personnel who are responsible for the service and maintenance
of the sewing machine. This manual describes “Adjustment Procedure”, “Results of Improper Adjustment”, and
other functions which are not covered by the Instruction Book intended for the maintenance personnel and
sewing operators at a sewing factory.
All personnel engaged in repair of LZ-2290A Series • IP-100 / SC-915 are required to carefully read Section 2
“Standard Adjustment” which contains important information on the maintenance of LZ-2290A Series • IP-100
/ SC-915.
The “Standard Adjustment” consists of two parts ; the former part presents illustration and simplified explanation
for the convenience of reconfirmation of the required adjustment values in carrying out actual adjustment after
reading this manual once; and the latter part provides “Results of Improper Adjustment” in which sewing and/or
mechanical failures, and the correcting procedures are explained for those persons who perform such adjustment
for the first time.
It is advisable to use “LZ-2290A Series • IP-100 / SC-915 Parts Book” together with this Engineer’s Manual.

CONTENTS
1. SPECIFICATIONS .......................................................................................................... 1
(1) Specifications of the machine head...................................................................................................... 1
(2) Stitch pattern table................................................................................................................................ 2
(3) Function list .......................................................................................................................................... 3
(4) Cautions in operation............................................................................................................................ 3
2. NAME OF EACH COMPONENT .................................................................................... 4
3. STANDARD ADJUSTMENT .......................................................................................... 6
(1) Height and inclination of the feed dog .................................................................................................. 6
(2) Adjusting the feed timing ...................................................................................................................... 6
(3) Adjusting the feed amount.................................................................................................................... 8
(4) Position of the feed dog........................................................................................................................ 8
(5) Adjusting the slippage of materials (For ASU and ADU) .................................................................... 10
(6) Adjusting the origin of the needle rocking motor ................................................................................ 12
(7) Adjusting the needle entry position (In terms of needle rocking direction) ......................................... 14
(8) Adjusting the needle entry position (In terms of longitudinal direction) .............................................. 14
(9) Adjusting the longitudinal play at the needle bar ................................................................................ 14
(10) Position of the needle bar connection guide..................................................................................... 16
(11) Height of the needle bar ................................................................................................................... 16
(12) Adjusting the needle-to-hook timing and the needle guard .............................................................. 18
(13) Position of the bobbin case stopper ................................................................................................. 20
(14) Orientation of the needle bar thread holder...................................................................................... 20
(15) Position of the thread tension ........................................................................................................... 22
(16) Position of the pre-tension................................................................................................................ 22
(17) Position of the thread take-up spring guard...................................................................................... 24
(18) Installing the thread take-up thread guide B..................................................................................... 24
(19) Installing the thread take-up ............................................................................................................. 24
(20) Installation of the presser foot .......................................................................................................... 26
(21) Installing and adjusting the bobbin winder unit ................................................................................. 26
(22) Adjusting the amount of oil in the hook (ASS/-7, ASU/-7) ................................................................ 28
(23) Adjusting the thread trimming unit .................................................................................................... 28
(24) Initial position of the moving knife..................................................................................................... 30
(25) Timing of the thread trimming cam ................................................................................................... 30
(26) Installing/removing the knife unit ...................................................................................................... 32
(27) Stop position of the needle after thread trimming (Needle UP stop) ................................................ 32
(28) Clearance provided between the main shaft handwheel and the stator........................................... 32
(29) Position of the automatic reverse stitching magnet .......................................................................... 34
(30) Adjusting the thread tension releasing solenoid ............................................................................... 34
(31) Adjusting the stitch length dial .......................................................................................................... 36
(32) Adjusting the lubrication mechanism (ASS and ASU only) .............................................................. 38
(33) Adjusting the position of the thread draw-out wire
(For the machine with thread trimmer only) ......................................................................................38
(34) Adjusting the stroke of the thread draw-out wire
(For the machine with thread trimmer only) ......................................................................................40
(35) Installing the wiper base (WB only) .................................................................................................. 40
(36) Adjusting the wiper solenoid (WB only) ............................................................................................ 42
(37) Position of the wiper ......................................................................................................................... 42
1) WB type ........................................................................................................................................ 42
2) CB type......................................................................................................................................... 44

4. PROCEDURES OF DISASSEMBING/ASSEMBLING AND CAUTIONS .................... 46
(1) Adjusting and assembling of the gear box (large) .............................................................................. 46
(2) Replacing the motor ........................................................................................................................... 48
(3) Replacing the timing belt .................................................................................................................... 50
(4) Removing/installing the gear box cover.............................................................................................. 50
(5) Disassembling/assembling the needle bar support base shaft (asm.) ............................................... 52
5. MAINTENANCE............................................................................................................ 64
(1) Replacing procedure of the printed circuit board................................................................................ 64
(2) Maintenance of the hook lubricating pipe oil filter............................................................................... 65
(3) Cleaning the cooling fan ..................................................................................................................... 66
(4) Applying the exclusive grease ............................................................................................................ 67
(5) Hook shaft gear .................................................................................................................................. 71
(6) Adjusting the needle rocking link ........................................................................................................ 72
(7) Lubricating to face plate section (ASS and ASU only) ....................................................................... 73
(8) Protruding amount of the hook shaft .................................................................................................. 75
(9) Draining of CB type ............................................................................................................................ 75
(10) Cleaning the dust bag of CB type..................................................................................................... 75
6. OPERATION PANEL.................................................................................................... 76
(1) Names of the respective sections....................................................................................................... 76
(2) Information.......................................................................................................................................... 78
(3) Matters that demand special attention regarding the operation panel, IP-100 ................................... 92
7. SPECIFICATIONS OF SC-915..................................................................................... 93
8. FUNCTION SETTING PROCEDURE OF SC-915........................................................ 93
(1) How to change over to the function setting mode .............................................................................. 93
9. FUNCTION SETTING LIST .......................................................................................... 97
10. DETAILED EXPLANATION OF SELECTION OF FUNCTIONS.............................. 101
11. EXTERNAL OUTPUT/INPUT CONNECTORS......................................................... 107
(1) Connector connection diagram......................................................................................................... 107
12. ERROR DISPLAY..................................................................................................... 108
(1) ERROR DISPLAY ............................................................................................................................ 108
(2) Error code list (Error display in panel) .............................................................................................. 109
(3) Warning list....................................................................................................................................... 112
13. SCREWS FOR ATTACHMENTS ............................................................................. 113
14. SPARE PARTS......................................................................................................... 113
15. OPTIONAL CORD .................................................................................................... 114
(1) Relay cord A asm. for standing machine (Part No. M9701351AA0) ................................................ 114
(2) Relay cord A asm. for DC24V (Part No. M9703351AA0) ................................................................. 115
16.TROUBLES AND CORRECTIVE MEASURES......................................................... 116
(1) With regard to lubrication.................................................................................................................. 116
(2) With regard to sewing....................................................................................................................... 118
(3) With regard to mechanical components ........................................................................................... 123
17. CONFIRMATION ...................................................................................................... 128
18. BLOCK DIAGRAM ................................................................................................... 129
(1) Block diagram A ............................................................................................................................... 129
(2) Operation panel block diagram......................................................................................................... 130
19. DRAWING OF TABLE.............................................................................................. 131
CUSTOM PATTERN NEEDLE ENTRY POSITION DATA SHEET ....................................................... 132

−1−
1. SPECIFICATIONS
(1) Specifications of the machine head
* 1 : The sewing speed is regulated in accordance with the destination at the time of delivery. (Zigzag width is
also regulated.)
* 2 : Zigzag width is regulated to 8 mm at the time of delivery. (Max. 10 mm is applied to all zigzag machines.)
* 3 : Normal and reverse feed amounts are regulated to 2 mm at the time of delivery.
Model
Application
Max. sewing speed
Max. zigzag width
Max. feed amount
(Normal/reverse)
Stitch pattern
Needle
Dimension of the bed
Number of revolution
of resistor pack
Needle bar stroke
Bobbin winder
Wiper (WB only)
Automatic reverse
stitching
Lubrication
Lift of the presser foot
(by hand lifter)
Lift of the presser foot
(by knee lifter)
Lift of the presser foot
(by AK auto-lifter)
Kind of the hook
(Part No.)
Bobbin case (asm.)
Height of the feed dog
Lubrication of the face
plate section
Drive system
Transmission function
Motor output
Operating power
Solenoid drive power
Additional function
Device and optional
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
LZ-2290ASS / –7
5,000 rpm (*1)
5 mm/4 mm (*3)
(Stepless fine adjustment)
1.2 mm
LZ-2290ASU / –7
4,500 rpm (*1)
2.5 mm/2.5 mm(*3)
(Stepless fine adjustment)
1.4mm
LZ-2290ADS / –7
5mm/4 mm (*3)
(Stepless fine adjustment)
1.2 mm
LZ-2290ADU / –7
2.5mm/2.5 mm (*3)
(Stepless fine adjustment)
1.4mm
Lubrication system to oil tank for hook
lubrication
JUKI New Defrix Oil No. 1 is used.
(Equivalent to ISO VG7)
Plunger pump is employed.
22525877
40003598 (with idle-prevention spring)
Minute quantity lubrication by oil wick
Full non-lubrication
23557259 (Non-lubrication hook)
40003609 (with idle-prevention spring)
Non-lubrication
4,000 rpm (*1)
Light- to medium-weight materials
10 mm (*2)
8 kinds 14 patterns (Custom pattern : 500 stitches, 20 kinds can be stored.)
SCHMETZ 438, ORGAN DPX5 : #65 to #90
178 mmX517 mm
4,000 rpm (Excluding a certain territory of export)
33.4 mm
Built-in in the upper face of machine head type (with bobbin thread retaining plate)
Electromagnetic front-wiping system
Built-in electromagnetic system
5.5 mm
10 mm
6 to 6.5 mm
Direct drive system (compact AC servo motor)
Timing belt system
Rated output 450W
3-phase 200V, Single phase 100V
DC34V
Presser foot micro-lifting screw is provided as standard.
AK-121 (auto-lifter device) Grease tube part No. (40006323)
500 g tin of exclusive grease for maintenance (Part No. : 23640204)
Touch-back kit (asm.) (Part No. : 23546658) (For types other than WB, CB and 0B)

−2−
(2) Stitch pattern table
Straight stitch
Standard zigzag stitch
2-step zigzag stitch
3-step zigzag stitch
Scallop
(right)
Scallop
(left)
Blind stitch (right)
Blind stitch (left)
Custom pattern
Number of stitches
for pattern Max. zigzag width
–
10
10
10
10
10
10
10
Remarks
Standard
scallop
Crescent
scallop
Equal-width
scallop
Equal-width
scallop
Standard
scallop
Crescent
scallop
Equal-width
scallop
Equal-width
scallop
1
2
4
6
24
12
24
12
2+a
–
Name of pattern Stitch pattern
Up to 500
a
a
（ ）
（ ）
（ ）
（ ）
（ ）
（ ）
（ ）
（ ）

−3−
(4) Cautions in operation
1) Be sure to drain oil in the oil tank and attach the air vent cap (red rubber cap) supplied with the machine to the air
vent (golden bushing) located on the side face of the machine bed when transporting the sewing machine.
2) In the case where placing ASS or ASU type machine on a stand or the like before setting the machine to the machine
table, to protect the oil tank from damage, take car if there is any protruding object under the stand or the like.
3) Be sure to securely set the connector of the safety switch to the control box to prevent accidents at the time of maintenance.
4) Oil is kept in the gear box for lubrication. It is not necessary to replace the oil. Do not remove the gear box cover
except when it is necessary.
* When the box cover has been removed, it is necessary to replace the packing.
5) Be sure to operate the sewing machine with the bobbin case removed when making the sewing machine run idle.
If the bobbin thread is in the bobbin case, the thread protrudes from the bobbin case and is entangled in the hook
race or the hook shaft. As a result, the trouble will be caused.
(3) Function list
Sewing
Straight stitch
Standard
2-step
3-step
Blind stitch
Scallop
Custom
Free
Overlapped
Program
Pattern
Continuous
Cycle
Max. number
of steps
Max. number
of stitches in each step
Max. number of registers
that can be performed
Max. number
of stitches
Free
stitching Overlapped stitching Program
stitching Conden- sation Conden-
sation
custom
Custom
pattern
(Internal
memory)
Custom
pattern
(Smart
media)
Zigzag
width and
stitch base
line setting
Pattern
register Continuous stitching
register
Cycle
stitching
register
9
19
20
500
10,000
64
Start 20
End 20
500
20
10,000
500
999
499,500
99
20
500
10
10,000
20
500
10
10,000

−4−
2. NAME OF EACH COMPONENT
1 Needle thread draw-out device 7 Pedal !44 Bobbin winder
(LZ-2290A (U)-7) 8 Knee lifter lever !5 Tension controller No. 1
2 Wiper switch (WB/CB type) 9 Power switch !6 Thread stand
3 Thread take-up cover !0 TB switch !77 Oiling inlet
4 Finger guard !11 Stitch length dial !88 Reverse feed stitching lever
5 Thread tension controller !22 Condensation dial !9 Mirror switch
6 Control box !33 Operation panel @0 Handwheel
1
2
3
4
5
6
7
8
9
!0
!1
!22
!3
!5
!6
!77
!88
@0
!9
!4

−5−
1Needle thread draw-out device (LZ-2290A (U)-7)
This device draws out needle thread at the time of thread trimming.
2Wiper switch (WB/CB type)
This switch is used to wipe needle thread after thread trimming from the cloth by means of the wiper
signal which is output from the PSC box.
3Thread take-up cover
This is a cover to protect the human body from the contact with the thread take-up.
4Finger guard
This is a guard to protect the human body (mainly fingers) from the contact with needle.
5Thread tension controller
6Control box
This box contains circuit to control sewing machine and motor, output circuits to activate respective
outputs (thread trimming solenoid, reverse feed stitching solenoid, etc.), pedal sensor to detect pedal
action, and power circuit to activate respective functions.
7Pedal
This pedal performs sewing machine speed control, thread trimming action, presser lifting action (for
AK118 only), etc. by operation of depressing the front part of pedal or the back part of pedal.
8Knee lifter lever
9Power switch
This is the power switch for motor, PSC, operation panel, etc.
!0 TB switch
This is an operation switch to perform reverse feed stitching by means of the TB switch.
!1 Stitch length dial
!2 Condensation dial
!3 Operation panel
This panel is used for setting automatic reverse feed stitching, pattern stitching, zigzag width, etc.
!4 Bobbin winder
This is a bobbin winder which is built in the machine head.
!5 Tension controller No. 1
!6 Thread stand
!7 Oiling inlet
This is the oiling inlet for hook lubrication. (For ASS and ASU only)
!8 Reverse feed stitching lever
!9 Mirror switch
This is an operation switch to inverse scallop pattern or custom pattern by means of the mirror switch.
@0 Handwheel

−6−
3. STANDARD ADJUSTMENT
(1) Height and inclination of the feed dog
Standard Adjustment
(2) Adjusting the feed timing
Standard Adjustment
A B
Standard height : 1.2 mm : LZ-2290ASS, LZ-229ADS
: 1.4 mm : LZ-2290ASU, LZ-2290ADU
Inclination : The feed dog should be almost leveled
when the top surface of the ascending feed
dog is flush with the top surface of the
throat plate. (ASS, ADS)
Reference for the height and inclination of the
feed dog
™When the respective marker dots are
leveled, the height is 1.2 mm and the
inclination is leveled. (ASS, ADS)
Timing mark F
engraved on
face plate
Feed rocker
cam
Feed
rocker rod
Alignment of
timing marks
Timing mark I
engraved on
face plate
Marker line
engraved on
thread take-
up
1.2 mm
Throat plate
Feed dog
Hole for
screwdriver
Top suface of
throat plate
Comes down.
1.2 mm
LeveledLeveled
Operator’s
side
Position of marker dot
(Inclination)
Position of marker dot
(Height)
1
2
3

−7−
Adjustment Procedures Results of Improper Adjustment
Adjustment Procedures Results of Improper Adjustment
1) Set the feed amount to 0 mm. Feed amount is regulated to (max. 2
mm at the time of delivery.)
2) Adjusting the height of the feed dog
Loosen screw 1and adjust the height of the feed dog by turning feed
driving link shaft 2.
3) Adjusting the inclination of the feed dog
Loosen screw 3. Put a screwdriver through the hole for the screwdriver
and adjust the inclination of the feed dog by turning the feed rocker
shaft with the screwdriver.
(Caution) 1. If the feed rocker shaft is not pressed in the direction A
(a) during the adjustment procedure, there will be a
play at the feed bar or washer will come off. So, be sure
to adjust the feed dog with the feed rocker shaft pressed
in the direction A (a).
2. Check to be sure that the feed dog is leveled with the
feed amount currently used when the top surface of
the ascending feed dog is flush with the top surface of
the throat plate.
3. For the adjustment of slippage of materials for ASU and
ADU, refer to (5) Adjusting the slippage of materials and
adjusting the feed timing.
™Perform the adjustment of the
inclination of the feed dog according
to the sewing process.
(Example)
™When the feed force is required in
such a process of tape attaching or
the like :
Adjust so that this side of the feed
dog is raised.
™When using the slippery material in
such a process of attaching a facing
of girdle :
Adjust so that the feed dog should
be leveled.
A. Adjusting procedure by removing the gear box cover (ASS,ADS)
1) Remove the gear box cover. (Refer to the item 4-(1).)
2) Adjust the marker line engraved on the thread take-up to the timing
mark I engraved on the face plate.
3) Set the feed amount to 2.5 mm. However, the feed amount has to be set to
“0” mm only for LZ-2290SU and LZ-2290DU.
4) In the aforementioned state, loosen the setscrew in the hook driving shaft
sprocket and adjust the timing mark engraved on the feed rocker cam to
the timing mark engraved on the feed rocker rod.
(Caution) In this case, the hook timing (thread trimming timing for the
machine equipped with a thread trimmer) changes. Be sure to perform
re-adjustment.)
B. Adjusting procedure with the gear box cover attached (For fine
adjustment) (ASS,ADS)
1) Set the feed amount to "0" mm.
2) Adjust the marker line engraved on the thread take-up to marker line
J engraved on the face plate.
3) In the aforementioned state, loosen the setscrew in the hook driving shaft
sprocket. Now, turn the hook driving shaft to adjust so that the feed dog
comes down. Adjust so that the top surface of the feed dog is aligned with
the top surface of the throat plate when the feed dog comes down.
* There is a slight inclination at the feed dog. Adjust the feed dog so that “0”
to 6 teeth come out from the top surface of the throat plate.
(Caution) After the aforementioned adjustment, “hook timing” and
further “thread trimming cam timing” for the machine equipped with a
thread trimmer will change. Be sure to re-adjust them properly.
™For the adjustment of ADU and
ASU, refer to (5) Adjusting the
slippage of materials and adjusting
the feed timing.

−8−
(3) Adjusting the feed amount
Standard Adjustment
(4) Position of the feed dog
Standard Adjustment
LZ-2290ASS, DS
Condition : Feed amount : maximum
Feed bar
AB
Feed crank stud Timing mark
Normal feed amount
regulation metal fitting Feed spring hook
Feed converting
arm A (asm.)
Feed adjusting link
Reverse feed amount
regulation metal fitting
LZ-2290ASU, DU
1
2
3
12
1
A=B

−9−
Adjustment Procedures Results of Improper Adjustment
Adjustment Procedures Results of Improper Adjustment
[Feed “0” adjustment]
1) Set the stitch length dial at “0”.
2) Loosen screw 1, and align the timing mark on the feed crank stud
with that on the feed crank stud support.
(The position of the timing mark differs with models.)Insert a sheet of
paper between the throat plate and the presser foot, turn the
handwheel by hand and check that the needle entry points are the
same. If the points are not the same, perform again fine adjustment.
(Fine adjustment is necessary since the marks are standard.)
3) When loosening screw 1, confirm that there is no axial play at the
feed converting arm A (asm.) and tighten screw 1.
[Normal feed adjustment]
4) Set the stitch length dial at the maximum value of the gauge to be
used.
* Normal feed is regulated to 2 mm at the time of delivery.
5) Loosen screw 2, make the feed adjusting link come in contact with
the screw and tighten screw 2.
[Reverse feed adjustment]
6) Loosen screw 3, pushing the feed lever down to make the sewing
machine enter the reverse feed stitching mode, press reverse feed
amount regulation metal fitting against the projecting section of the
reverse feed adjusting link B. Now, tighten screw 3. (Set the
condensation stitch length adjusting dial to the maximum value on
the scale.)
* Reverse feed is regulated to 2 mm at the time of delivery.
7) To decrease the reverse feed stitching length for fastening stitching,
use the condensation stitching function. (Refer to “Adjusting the
condensation stitching mechanism” in the Instruction Manual for the
LZ-2290A Series.)
8) When the ratio of sewing length (as many as 10 stitches) of normal
and reverse feed is approximately 90% in case of straight stitch feed
amount of 2 mm, the adjustment is OK.
™If the timing marks are not aligned
with each other, the actual feed
amount will be different from the
feed amount specified on the stitch
length dial.
™If the timing marks greatly separate
from each other, the normal or
reverse feed amount will be
increased causing the feed dog to
come in contact with thread
trimming counter knife. (In case of
thread trimming)
™The feed dog will come in contact
with the throat plate.
1) Adjust the stitch length dial to the maximum feed amount the feed
dog to be used.
* Feed amount of both normal feed and reverse feed is regulated to 2
mm at the time of delivery from the factory.
The maximum feed amount of the feed dog at the time of delivery is 2
mm. (Feed dog part No. : 22581508)
2) Turn the handwheel, and fix the feed dog so that the clearances in
front and rear are the same at the position where the feed dog does
not come in contact with the throat plate. (A = B)
3) In the case where the gear box (large) cover is not opened, loosen
setscrews 1in the feed bar crank to adjust the position.
4) In the case where the gear box (large) cover is opened, loosen
setscrew 2in the feed rocker shaft crank to adjust the position.
Max. normal feed amount
of the mechanism LZ-2290ASS, ADS=5 mm
LZ-2290ASU, ADU=2.5 mm
Max. reverse feed amount
of the mechanism LZ-2290ASS, ADS=4 mm
LZ-2290ASU, ADU=2.5 mm
Normal feed →large
Reverse feed →small
Nomal feed →small
Reverse feed →large

−10 −
(5) Adjusting the slippage of materials (For ASU and ADU)
Standard Adjustment
1.4mm
θ
1.4 mm
θ
θ
Standard state of engraved marker
dot of vertical feed link shaft
Standard height of feed dog
Operator’s
side
Sewing direction
Upper material
Lower material
Minus slippage
of material
Upper material
Lower material
Upper material
Lower material
“0” slippage
of material
Plus slippage
of material
Standard position
1
23
23
3
3
3
Engraved marker line
on thread take-up Timing mark on
face plate G
Horizontal feed cam Horizontal feed rod
Alignment of timing marks
I

−11 −
Adjustment Procedures Results of Improper Adjustment
1) To adjust the height and inclination of the feed dog, loosen setscrews
1in the vertical feed link shaft and turn vertical feed link shafts 2
and 3with a screwdriver.
2) The standard inclination is the position where the engraved marker
dots of vertical feed link shafts 2and 3face in the direction of 9
o’clock (left side).
3) The standard height of the feed dog is 1.4 mm from the top surface of
the throat plate.
<Adjusting the slippage of materials>
◎This machine can adjust “Amount of slippage of materials” by
adjusting the height and inclination of the feed dog.
4) Mainly adjust vertical feed link shaft 3.
The amount of slippage of materials can be adjusted by the position
of the engraved marker dot which means the size of each theta θof
the inclination of the feed dog.
* Points of adjustment.
1. Quality of finished products is improved when the slippage of materials
is slightly adjusted to the minus state. (Operator’s hand pressure
should be considered in actual sewing.)
2. When performing the adjustment, simultaneously adjusting vertival
feed link shafts 2and 3makes it difficult to see the characteristic of
the slippage of the material. So, set 2to the standard state (reference)
and mainly adjust 3.
3. In the case where the slippage of material (0 to minus) cannot be
obtained by adjusting vertical feed link shaft 3only, adjust vertical
feed link shaft 2so that theta θ, inclination of the feed dog is
increased.
<Adjusting the feed timing>
1) Adjust the engraved marker line on the thread take-up to timing mark
G on the face plate.
2) Set the feed amount to 2.5 mm. However, for LZ-2290SU and LZ-
2290DU, set it to "0" mm.
3) In this state, loosen the setscrew in the hook driving shaft sprocket,
and adjust timing mark on the horizontal feed cam to that of the
horizontal feed rod.
(Caution) In this case, the hook timing (thread trimming timing in
case of the machine with thread trimmer) changes. Be sure to
perform re-adjustment.
™The height 1.4 mm of the feed dog
has been factory-set at the time of
delivery. Change the height in
accordance process the process.
(Characteristic of slippage of
materials changes. So, be careful.
™When the adjustment of the height
of the feed dog has been performed,
the sewing pitch is different from the
scale on the stitch length dial. Re-
adjust the scale with the actual
sewing pitch.
™Characteristic of slippage of
materials changes in accordance
with materials.
(The relation between the direction
of the engraved dot and slippage of
materials described in the
Engineer’s Manusl is the standard
of adjustment.)
™Adjust on the left-hand side the
adjusting positions of the engraved
marker dots of vertical feed link
shafts 2and 3.
If the position of the engraved
marker dot is on the right-hand side,
the effect of prevention of slippage
of material is difficult to be obtained.
Range of use
of engraved
marker dot
Left Right

−12 −
(6) Adjusting the origin of the needle rocking motor
Standard Adjustment
™Adjustment of the origin is performed in case the needle rocking amount in terms of the center is
not equal when (7) Adjusting the needle entry position is performed, or the motor or the sensor is
required to be replaced.
Assemble link 9and motor shaft
so as to be flush with each other.
<Condition of the origin “0”>
When the link is at 90˚, move the light-up sensor
from the rightend to the left. The position of the
origin “0” is when the sensor gose out.
1) 2), 5)
3)
4), 6), 8)
6)
Needle rocking
motor cover
Needle rocking
unit base
Motor
Origin sensor
(asm.)
Sensor
installing base
90˚
Positioning jig
90˚
1
2
3
6
6
5
7
8
9
1
4
Needle bar
support base
9)

−13 −
Adjustment Procedures Results of Improper Adjustment
1) Remove four setscrews 1in the needle rocking motor cover.
2) Remove three setscrews 2and counter sunk screw 3.
(At this time, loosen setscrew 4in the needle bar support
base shaft connecting stud as well. Refer to the item “(7)
Adjusting the needle entry position”.)
* When assembling, after temporarily tightening screws 3and
2, tighten in the order of 3and 2.
3) Move the needle bar in the direction of the face plate, draw out
the needle bar support base shaft from the needle bar support
base shaft connecting stud, and remove the shaft together with
the needle rocking unit base from the machine arm.
In case of replacing or adjusting the needle rocking motor
* For the replacement of the sensor, refer to the item of the
sensor.
4) Loosen setscrew 5in the motor link bracket and remove link
9.
5) Loosen four setscrews 6in the needle rocking unit base and
remove the motor to replace.
6) Tighten setscrew 5in the motor link bracket.
(Check also setscrew 7in the motor link.)
In case of replacing or adjusting the sensor
7) Confirm that the sensor lamp lights up in the hook adjusting
mode.(Refer to (12) Adjusting the needle-to-hook timing and
the needle guard.)
8) Loosen setscrews 8in the sensor installing plate, move the
sensor installing plate to the right-hand end once, and gradually
move it to the left-hand side. Tighten setscrews 8when the
sensor lamp goes out. This state is “0” of the origin. (However,
it is when the link 9 is at 90˚.)
9) To determine the position of the sensor, it is convenient to
make a positioning jig as shown in the figure on the left.

−14 −
(7) Adjusting the needle entry position (In terms of needle rocking direction)
Standard Adjustment
Needle bar support base shaft
connecting stud
1
2
3
(9) Adjusting the longitudinal play at the needle bar
Standard Adjustment
As observed from
the face plate side
Engraved
marker dot
For an
excessive play
For an
excessive play
It is not necessary to remove the face plate.
Needle bar support
base guide shaft
Needle bar
1
2
3
(8) Adjusting the needle entry position (In terms of longitudinal direction)
Standard Adjustment
Hole for adjusting
needle entry position
Needle enters the
center of needle slot.

−15 −
Adjustment Procedures Results of Improper Adjustment
Adjustment Procedures Results of Improper Adjustment
DC
A = B
1) Loosen setscrews 2and remove bobbin winder unit 1.
2) Set both zigzag width and stitch base line to the position of "0" in the
hook adjusting mode.
Set the position of the needle to the center
and temporarily tighten it.
Referto(12)Adjustingtheneedle-to-hooktimingand the needle guard.
3) Set the zigzag width to 8 mm which is factory-adjusted at the time of
delivery, move the needle bar by hand to adjust so that the clearances
of zigzag widths C and D are equal and securely tighten screw 3in
the needle bar support base shaft connecting stud.
Conditions : Needle enters the center of zigzag width.
: Max. zigzag width (8 mm)
(Caution) Do not flap or strongly press the needle bar at the time of
adjustment.
1) Loosen screw 1in the face plate.
2) Remove rubber cap 2. Then tighten screw 1while pressing pin 3in
the needle bar support base guide located inside the face plate with a
screwdriver.
3) At this time, move the needle bar to the right and left by hand to confirm
that there is neither extra load nor a longitudinal play.
4) If the load applied to the needle bar and the longitudinal play existing at the
needle bar at the rightmost needle throw position differ from those at the
leftmost needle throw position, perform the adjustment by turning pin
3 in
the needle bar support base guide to change the orientation of the engraved
marker dot (toward the direction where the load and play are larger).
(Caution)
1. Be sure to check the longitudinal play at the needle bar support
base. In the case where there is any longitudinal play or extra
load, the needle throwing action will be affected.
2. Refer to (5) Disassembling/assembling the needle bar support
base shaft (asm.) of 4. PROCEDURES OF DISASSEMBLING/
ASSEMBLING.
™Thread will not be uniformly tensed
when the needle throws to the right
and left, or thread breakage or
needle breakage will result.
C = D
AB
Adjustment Procedures Results of Improper Adjustment
1) Loosen the screw, which can be observed through the hole for
adjustment, in the needle bar support base guide shaft with the face
plate attached.
2) Move the needle bar back or forth to adjust so that the needle enters
the center of the needle slot in the throat plate.
3) Fix the needle bar support base guide shaft.
4) Be sure to check the needle throw torque applied to the needle bar
support base.
(Caution)
1. The needle entry position in terms of the longitudinal direction
should be finely adjusted. If the needle bar has to be moved by
a large margin for the adjustment of the needle entry position in
case of replacement of gauges, carry out the adjustment
referring to “(10) Position of the needle bar connection guide”.
2. Be sure to check the left/right plays at the needle bar support base.
In the case where there is any extra load applied to the base,
needle throwing action will be affected.
™When there is a longitudinal play
at the needle bar, a clearance
between the needle and the
blade point of the hook occurs.
As a result, sewing trouble or
worn-out of the blade point of the
hook will result.

−16 −
(10) Position of the needle bar connection guide
Standard Adjustment
(11) Height of the needle bar
Standard Adjustment
Conditions : Zigzag width : “0”
Position of needle position changing lever : Center
™Part No. of engraved indication E
: 22536502
A Dimension : 12.2 mm
B Dimension : 3.4 mm
2
Engraved
indication
Timing gauge
Needle bar
support base
Needle bar
connection guide
Needle bar crank
rod guide
1
2
3
4
5
1
A
B
A
E