JUKI HZL-T100 User manual

SERVICE MANUAL
HZL-T100
®
COMPUTER SEWING MACHINE

CONTENTS
[1] SPECIFICATIONS ··············································································· 1
[2] CONFIGURATION ··············································································· 4
[3] ASSEMBLY / DIASSEMBLY ································································· 5
[4] CIRCUIT BOARD CONNECTING DIAGRAM ······································· 12
[5] ADJUSTMENT ······················································································ 13
WARNING :
• When disassembling, assembling or adjusting the sewing machine, remove the power plug.
• When assembling, be careful about the electrical cord being caught with other components,
damage to the covered parts of the cord or miswiring.
• When replacing the part(s), use the genuine part(s).
To avoid the risk of fire, electric shock, injury to persons or damage to
components, especially keep the following:
Frame components
1. Top cover, top board ································ 5
2. Handle, face plate cover ·························· 5
3.Operatinglever··········································5
4.Frontpanel·················································6
5. Bed base, cylinder bed lower cover ········ 6
Functional components
1. Microcomputer circuit board, main shaft
detecting·····································································7
2.Motor,controlbox······················································7
3. Idler, bobbin winder base (asm.) ······························ 8
4.Transformer,powerswitch········································ 8
5. Needle bar connecting rod, needle throwing STM ·· 9
6.Face plate (asm.) ······················································ 9
7. Main shaft, operating lever receiving plate ············ 10
8.Cylinder bed receivingplate (asm.) ························10
9.Needle bar frame stud (asm.) ·································· 11
Sewing components
1.Heightofneedlebar································································································································13
2. Needleentry (lateral) inthe throat plate (needleplate) ······································································· 13
3.Heightofthepresserfoot······················································································································13
4.Heightofthefeeddog····························································································································14
5.Adjustingtheneedletohooktiming ······································································································14
6. Clearance betweentheneedle and the blade point············································································15
7. Position of the detent plate of the inner hook (position of the bobbin case opening lever) ················ 15
8.Adjustingthelongitudinalfeed···············································································································16
9.Buttonholechange-overswitch···············································································································17
10.Verticalposition of automatic threader hook ······················································································· 17
11.Adjustingthetension·························································································································18-21
Automatic thread trimmer components
1. Positionof the thread trimmingswitch and one-stitch switch······························································ 22
2.Timingofthreadtrimming·······················································································································22
3. Position of the moving knife (draw-in position of the moving knife) ···················································· 23
4.Adjustmentoftheknifedrivinglink········································································································23
(Clearance between the driving link roller and the thread trimming cam)
5.Adjustmentofthe knifedisengagingplate ···························································································· 24
(Engagement of the disengaging plate and the thread trimming cam)
6.Looperstroke(verticalstroke)················································································································24
7.Adjustingthepositionofknife·················································································································25
8.Stoppositionofthreadtrimmer··············································································································25

(1) Speed regulating components
Slide control system
Stepless speed change gear
When using this controller, the slide control mechanism is inoperative.
The control speed is same as the speed controlled by the slide control mechanism.
(2) Table stand components
Main unit case
Handle
(3) Bed type
Cylinder bed and flat bed
Quickly change over by a finger control
(4) General mechanism
1. Thread take-up
2. Hook
3. Pressure regulator
4. Lighting mechanism
5. Needle thread stand
6. Bobbin thread winder
7. Needle threader
8. Presser foot
9. Replacement of presser foot
10. Power switch
11. Lubrication
12. Cable
[1] SPECIFICATIONS
For straight stitching : 116 to 750 rpm
For stitching methods other than straight stitching : 116 to 500 rpm
For winding a bobbin : 116 to 700 rpm
: The main unit case covers the components exclude the under cover and
the handle.
: Designed to be tilted from the main unit of the sewing machine.
: Link type thread take-up with slit for one-touch utility thread eyelet
: Full-rotary, vertical-axis hook
: Constant pressure applying system
: Built in face plate cover
The power switch of the sewing machine is commonly used as the lamp
switch.
: Horizontal type thread stand built in the top board
: Bobbin winder shaft sliding method
Thebobbin winder startswinding a bobbinby operating thestart/stop switch.
:One-touch
: Exclusive transparent presser foot
: Snap-on/-off type
: 2-step power switch commonly used as the lamp switch
: No lubrication is required ( under the normal operating conditions).
* Lubricationg the inner hook is prohibited.
: A 1.9 m long power cable is removable.
-1--1-
-1--1-
-1-

-2--2-
-2--2-
-2-
(5) Needle bar rocking mechanism
1. Needle bar rocking method
2. Straight stitching
3. Stitch width
4. Adjustment of stitch width
5. Standard line
6. Needle bar driving system
(6) Feed mechanism
1. Feed amount
2. Reverse feed amount
3. Adjustment of feed amount
4. Reverse feed stitch
5. Feed mechanism
(7) Special-purpose mechanism
1. Automatic thread trimmer
2. Automatic needle threading device
3. Automatic buttonholing
4. Selection of stitch patterns
: By the arc method
: Left, center, right
: Max. 6 mm depending on the stitch pattern
: By sliding the lever (The stitch width adjusting mechanism is effective when
the manual operation indication LED lights up.)
When manually adjusting, notice of change-over of the set value is given by
the buzzer sound.*
As for the part of automatic set value, the notice is given by the flash on/off of
LED.*
: Left standard line
: By a stepping motor
: 0 to 4 mm
: 0 to 2.4 mm
:By sliding the lever(Thefeed amount adjusting mechanismis effective when
the manual operation indication LED lights up.)
When manually adjusting, notice of change-over of the set value is given by
the buzzer sound.*
As for the part of automatic set value, the notice is given by the flash on/off of
LED.*
: The machine performs reverse feed stitching at low speed only when the
switch is ON.
: By a stepping motor
The moving knife trims the thread while the main shaft makes a revolution (
or a shaft revolution form its lower stop position) by setting the operation
lever to the thread trimming position. (116 rpm)
The hook automatically rotates and returns to its home position by lowering
the threading lever.
Auto-return type full automatic buttonholing
Buttonhole size can be specified as desired. When the buttonhole is fin-
ished, the machine automatically stops after performing fastening stitching.
(The machine gives an error message on the LCD to prevent the operator
from starting the machine without setting the machine for the buttonholing.)
Straight stitch Direct selection by the touch switch *
Other stitch patterns by shift selection (99 stitch patterns)*
Shift direction change-over switch is provided. *

-3--3-
-3--3-
-3-
5. Number of stitch patterns
6. Slow start function
7. Constant stop position of the
needle bar
8. Prevention of incorrect needle
insertion
9. Prevention of overheat
10. Bobbin case
11. Presser foot storage box
12. Automatic lock stitch
13. Thread tension unit:
14. Memory:
(8) Dimensions and weight
Dimensions
Weight
(9) Electric rating
Entire unit of the sewing machine
Lamp
Continuous stitch patterns 43*, One point stitch patterns 57* Total 100 stitch
patterns
Buttonhole : Buttonhole(small), Buttonhole(large), Eyelet buttonhole *, Deco-
rative buttonhole
Approx. 1 stitch is sewn at the speed of 116 rpm after the start switch is
turnedON.
Needle bar can be stopped in its highest position or lowest position by using
the synchronizer shielding plate and photo-interrupter.
· Needle bar stops in its lowest position at the time of the end of sewing.
· Needle bar stops in its highest position when the stitch pattern is selected
while it stops in its lowest position.
· Needle bar stops in its highest position at the time of thread trimming,
bobbin winding or lifting the presser foot.
A needle can be attached on the machine only when installing direction of
the needle is correct.
If the sewing machine rotation is locked for two seconds, the power to the
motor is automatically turned OFF. When the temperature of the motor ab-
normally rise, the power to the motor is turned OFF.
(Thermal cut) After the temperature of the motor has sufficiently lowered, the
machine can be started.
Integral witch the inner hook
Presser feet supplied as standard accessories of the machine are stored in
the auxiliary bed of the main unit of the sewing machine.
When the lock stitch is set, 3-stitches of the lock stitch are automatically per-
formed at sewing -start & -end.
In case of the one-point stitch pattern, the lock stitch switch is automatically
turned ON. *
Pre-tension, Disc pressure type thread tension with 2nd tension.
Memory capacity 20 pcs.
Every time the clear key is pressed, the stitch patterns set are cleared from
the last one. *
When keeping pressing the clear key, all the stitch patterns set are cleared.
400 mm (width) x 175 mm (depth) x 280 mm (height)
8.5 kg
220-240 V, 85 W, 50 Hz
(12 V, 5 W)

[2] CONFIGURATION
-4--4-
-4--4-
-4-
Power/Light switch
Hand wheel
Handle
Speed controller receptacle
Power cord receptacle
Speed controller
Electric power cord
Presser foot lifter/thread trimming lever Pattern (Number) selector
buttons
Face cover
Auxiliary bed
(Accessory box)
Stitch balance control
Start/stop button
(When speed controller is not used.)
Automatic backtack button
Top cover
Sewing speed setting lever
(When speed controller is not used.)
Reverse stitch button
Liquid crystal display (LCD)
Pattern No. increase/
decrease selector button
Pattern memory button
Pattern clear button
Straight stitch direct button
Needle set screw
Feed dog
Buttonholinglever
Presser foot release button
Needle threader
Presser foot holder Needle
Presser foot
Hook cover button
Bobbin
Bobbin case
Throat plate
(needle plate)
Bobbin winder
Spool pin
Bobbin winder thread guide
Thread tension dial
Pattern display panel
Thread spool cap
Manual stitch width
button & lever
Manual stitch length
button & lever

-5--5-
-5--5-
-5-
Frame components
1. Top cover, top board
Disassembly Assembly Point to be checked
When removing the top cover, bend
hinge . (The top board can be
removed with the arm cover attached.)
Remove five screws in the top board.
Lifting the top board, draw out the
connector.
* Do not remove the screw in the
bobbin thread winding amount
adjusting plate.
· Set the top cover in place with closed.
· Set the top board on the frame.
· Set the top board with its rear right
section accurately fitted with the face
plate cover.
· The hinge easily bend when closing
the top cover.
· Be careful to connect the connector
without fail.
· Take care not to allow the top board
to become loose.
2. Handle, face plate cover
Preparation required
Remove the top board.
Disassembly Assembly Point to be checked
Remove one retaining ring of the
handle.
Remove handle .
Loosen screw in the face plate
cover, and remove the cover.
· Set the handle on the frame.
· Attach the retaining ring to the handle.
·Set thecover onthe frame,and tighten
the screw.
· Carefully check the installing
direction of the handle.
· Securely attach the two installing
bosses in the face plate.
[3] ASSEMBLY / DISASSEMBLY
3. Operating lever
Preparation required
Remove the top board.
Disassembly Assembly Point to be checked
Loosen screw in the operating
lever, and draw out the operating lever. · Set the lever in place, and tighten the screw. · Take care not to allow the screw to become loose while the sewing
machine is in operation.
j
k
j
k
l
j
Retaining
ring of the
handle
Screw in the face
plate cover
Handle
(asm.)
Face plate
cover
j
k
l
m
Screw in the
operatinglever
j
j
Top cover
Face plate cover
Top board
Rear right
section
Top board screws
Hinge section
j
k

-6--6-
-6--6-
-6-
4. Front panel
Preparation required
Remove the top board.
Remove the front cover.
Remove the operating lever.
Disassembly Assembly Point to be checked
Loosen screw in the face plate of
thepanel.
(You may loosen and tilt the lamp
instead of loosening screw .)
Loosenscrew at the center of panel.
Loosen two screws in the bottom of
panel.
· In order to release the engaging
section to eliminate loose fitting,
remove the panel while lifting it.
Assemble through without fail.
· Tighten the four screws which have
been loosened.
Caution:
Make sure that the indicator
connecting cable has been connected.
Fit needle thread guide pin in the
groove on the front panel in the correct
manner.
Face plate cover
guideshaftA
5. Bed base, cylinder bed lower cover
Disassembly Assembly Point to be checked
Remove three screws in the rubber
seatA.
Remove three screws in the bed
base.
Remove two screws in cylinder bed
lower cover , and remove the cover.
· Attach the bed base on the frame.
· Fix the bed base by tightening the
screw which have been removed.
·Set the three rubber seat A on the bed
base with accuracy.
[Top surface of the frame]
[Side face of frame (face frame)]
[Bottom view of frame]
Center screw of panel
Screw at the bottom of panel
Screw in the side
face of panel Engaging section to
eliminate loose fitting
Needle thread guide pin
Engaging section of the panel
Engaging section at the center of panel
Needlebar
connecting rod
Mainshaft Bobbin winder shaft
ko
n
j
k
l
o
m
n
k
j
k
m
n
j
k
l
Screw in the bed base
Screw in the
cylinder bed
lower cover
Screw in the rubber seat A
j
k
l
l

-7--7-
-7--7-
-7-
Functional components
1. Microcomputer circuit board,
main shaft detecting
Preparation required
Remove the top board.
Remove the face plate cover .
Remove the front panel.
Disassembly Assembly Point to be checked
· Remove connectors (14 connec-
tors).
Cut cable clip , and remove the
lead from the radiating plate.
Remove two screws in the micro-
computer circuit board.
(Do not remove the screw in the radi-
atingplateattachedby anasterisk(*).)
Remove one screw in the main
shaftdetecting platecircuit board,and
remove the circuit board.
· Attach the microcomputer circuit
board on the frame, and fix it by
tightening the two screws.
· Connect the connectors.
(See page 12.)
· Attach the main shaft detecting plate
printed circuit board in place, and fix
it using the screw.
Caution:
Removing/attaching the
microcomputer circuit board.
Be sure to carefully remove the micro-
computer circuit board taking care not to
preventtheprinted circuitboardfrom com-
ingincontactwiththemetalfittingsmarked
with a double circuit and not to allow the
radiatingplate marked witha double circle
to come in contact with the motor belt,
transformer and other components.
· The shielding plate of the main shaft
should not come in contact with the
sensor when installing the printed
circuit board in place.
Cable clip
Screw in main
shaft detecting
circuit board
Screw in the microcomputer
circuit board * Screw in the radiating plate
Metalfittings
Radiating plate
2. Motor, control box
Preparation required
Remove the top board.
Remove the face plate cover.
Remove the front panel.
Disassembly Assembly Point to be checked
Remove two screws in the motor.
Lift stopper in the cover, and remove
the cover.
· Remove the motor belt and the con-
nector, then remove the motor.
Remove screws in the electrical box.
· Attach the electrical box in place, and
fix it with the screws.
· Set the leads in place. (See page 12.)
· Fit the cover to the electrical box.
(Pass leads through the hole in
the cover.)
· Attach the motor in place.
· Fit the leads of the motor in the
indented section of the cover.
· Take care of the belt tension.
j
k
l
j
k
l
j
k
l
m
Screw in the motor
Screw in the electrical box
Stopperof
the cover
Pass the leads
through the hole
in the cover.
jk
l
m

-8--8-
-8--8-
-8-
3. Idler, bobbin winder base (asm.)
Preparation required
Remove the top board and the handle.
Remove the face plate cover.
Remove the front panel.
Remove the microcomputer circuit board.
Disassembly Assembly Point to be checked
Loosen screw in the idler, then pull
the idler (asm.) toward you.
Remove two screws in the bobbin
winder base, and remove the base.
* Set the bobbin winder to its operating
state (by setting the shaft to its right
side).
· Check the timing of thread trimming,
then attach the idler (asm.).
·Attachthebobbinwinderbaseinplace,
and fix it with the screws.
· Refer to No. 2 on page 12 for the
correct timing of thread trimming.
· Belt tension: The belt should slacken
by 4 to 6 mm when applying a 200g
loadto center of the belt.
· When winding a bobbin, the bobbin
winding switch should be turned OFF.
4. Transformer, power switch
Preparation required
Remove the top board and
the front face cover.
Remove the front panel.
Remove the microcomputer circuit board.
Remove the idler and the motor.
(Remove the timing belt.)
Remove the cover of the electrical box.
Disassembly Assembly Point to be checked
Remove two screws in the trans-
former.
(Metal fittings come off simulta-
neously with the screws.)
· Remove the connector from the
printed circuit board.
Remove two screws in the power
switch.
· Remove the connector from the
printed circuit board.
· Attach the transformer to the frame,
and fix it with the screws.
· Attach the power switch to the frame,
and fix it with the screws.
· Refer to page 12 for how to connect
the connector.
· Take care of the polarity of the
connector.
j
k
m
j
k
l
Screw in the transformer Screw in the power switch
Metalfittings
j
k
l
[Top surface]
Screw in the bobbin winder base
Center of the belt
j
k
m
Screw in the idler

-9--9-
-9--9-
-9-
5. Needle bar connecting rod,
needle throwing STM
Preparation required
Remove the top board.
Remove the face plate cover.
Remove the front panel.
Remove the microcomputer
circuit board.
Disassembly Assembly Point to be checked
Remove screw in the needle entry
adjusting collar, and remove compo-
nents , and .
Remove E ring of the needle bar
connecting rod shaft.
Then remove washer and needle
bar connecting rod .
Remove two screws in the needle
throwingSTM, thenremove STM(step-
ping motor).
· Fix the needle throwing STM with the
screws.
· Check the performance of the needle
throwing STM and the needle bar
frame.
· Attach the connecting rod in place.
· Attach the components which have
been removed in place.
· Do not bend the connecting rod.
· Be sure to attach the components
properly.
Screw in the needle throwing STM
Needle bar connecting rod
6. Face plate (asm.)
Preparation required
Remove the top board.
Remove the face plate cover.
Remove the front panel.
Disassembly Assembly Point to be checked
Remove two screws in the face plate
(asm.),then remove the face plate
(asm.).
· Attach the face plate (asm.) on the
frame, and fix it with the screws. · Make sure that the front panel and the faceplatecoverare spacedequidistantly
with respect to the lateral direction.
Screw in the face plate (asm.)
[Top view of frame]
Needle throwing STM link gear
j
k
l
o
m
n
p
q
r
m
j
kl o
m
n
p
r
j
j

-10--10-
-10--10-
-10-
7. Main shaft, operating
lever receiving plate
Preparation required
Remove the top board and
the face plate cover.
Remove the front panel.
Remove the microcomputer
circuit board and the idler.
Remove the timing belt.
Remove the needle bar
connecting rod.
Remove the motor belt.
Disassembly Assembly Point to be checked
Remove two screws , and remove
the operating lever shaft receiving plate
(asm.).
Loosen screw in the needle bar crank.
Remove screw in the ball bearing
receiving plate located at the right-hand
side and remove the right-hand receiving
plate. Also, remove screw in the ball
bearing receiving plate located at the left-
hand side and remove the left-hand re-
ceiving plate.
· Detach the right-hand end of the main
shaft from the frame, and draw out
needle bar crank rod from the needle
bar connecting stud.
Or, remove the needle bar crank.
· Attach the main shaft in place.
(Engage the main shaft with the
needle bar crank or the crank rod.)
· Set the operating lever shaft receiving
plate in place, and fix it with the
screws.
* Set the timing belt and the motor
belt in place.
· Check the torque and thrust play of
the main shaft.
· Check the retaining position of the
leads.
Screw in the operating lever
shaft receiving plate
Screw in the
needle bar crank
Needle bar crank rod
8. Cylinder bed receiving plate (asm.)
Remove the top board and the bed base.
Remove the cylinder bed lower cover.
Loosen the idler.
(See No.3 on page 8)
Disassembly Assembly Point to be checked
Remove timing belt (large) from the
hook driving shaft pulley.
Remove five screws in receiving
plate .
· Remove the receiving plate of the
cylinder bed.
Remove knife change-over lower link
from engaging section .
· Engage the knife change-over lower
link with the receiving plate, and fix
them with the five screws.
· Put the timing belt (large) in place.
Check the needle entry and the
clearance provided between the
needle and the blade point of the hook.
· A uniform clearance should be
provided between the frame and the
throat plate (needle plate).
· Check the torque of the hook driving
shaft.
· When putting the timing belt in place,
refer to the description indicating the
timing of thread trimming (No.2 on
page 22.)
Timing belt (large)
Knife change-over lower link
Screw in the cylinder bed receiving plate
Screw in the main shaft ball bearing
Idler
Timing belt (large)
Knife change-over lower
link engaging diagram
j
k
l
m
j
k
l
m
l
j
k
l
m
j
k
lm

-11--11-
-11--11-
-11-
9. Needle bar frame stud (asm.)
Preparation required
Remove the presser foot holder
and the needle.
Remove the top board and
the face plate cover.
Remove the front panel.
Remove the screw (located at
the upper right section) of the
microcomputer circuit board.
Remove the connectors J2, J3
and J6 through J8.
Cut the cable clip.
Remove the operating lever
shaft receiving plate (asm.).
Remove the joint (left) of the
needle bar connecting rod.
Loosen the screw in the needle
bar crank.
Bring the moving knife to the
rightmost end of its stroke.
Disassembly Assembly Point to be checked
Remove needle bar frame stud fixing
screw .
Loosen needle bar frame stud adjusting
screw .
Remove two screws in needle bar
frame stud .
Draw out needle bar crank from
counterweight .
At this time, draw needle bar frame stud
to the left so that it opens.
· Disconnect the knife change-cover
upper link.
* Removing the handle and handle
retaining plate will allow you to carry
out the aforementioned disassembling
procedure with ease.
· Connect the knife change-over upper
link properly.
· Set the needle bar crank in the
counterweight.
· Fit the needle bar frame stud fixing
screw in place.
· Tighten the two screws in the needle
bar fame stud.
· Attach the operating lever shaft
receiving plate (asm.) in place.
Then adjust the needle entry with
respect to the predetermined three
points referring to No. 2 on page 13 and
No. 6 on page 15.
·Do not bend theconnecting rod and
the microcomputer circuit board.
· When setting the needle bar crank
on the counterweight, fix the crank
by tightening the screw in the flat
part of the crank.
· Check the lateral movement of the
needle bar.
Needle bar frame stud fixing screw
Needle bar frame
stud adjusting screw
Needle bar crank
Screw in the needle bar frame stud Hndleretaining plate
Needle bar frame stud
Counterweight
j
k
l
o
m
n
p
j
k
l
m
n
p

-12--12-
-12--12-
-12-
[4] CIRCUIT BOARD CONNECTING DIAGRAM
[Power circuit board for 120V]
CN1: Manual circuit board — GRA
CN2: One stitch switch — PRP
CN3: Main shaft detector circuit board — RED
CN4: Button hole switch — WHT
CN5: Lamp — WHT
CN6: Thread trimmer switch — BLU
CN7: Winder switch — GRA
CN8: M. computer c. board – indicator c. board connecting wire
CN9: Power circuit board J1 — BLK
CN10: Needle bar rocking detector circuit board — ORN
CN11: Needle bar rocking STM — BSTM
CN12: Feed detector circuit board STM — WHT
CN13: Feed STM — FSTM
CN14: Foot controller V.R. — YEL
CN15: Motor pulse detector circuit board — BLK
CN16: Power transformer (11 V AC 23 V AC line)
[Manual circuit board]
[Indicator circuit board]
[Power circuit board for 230V]
CN7
J3: Power switch
Fuse: 3 A J1: Motor drive
J5: Power cord
J2: Motor
J4: Power transformer
[Micro computer circuit board]
J2: Motor
J1: Motor drive
J4: Power transformer
J5: Power cord
Fuse: 3.15A
Fuse: 3 A...2 pcs m.c.c.board for 120V
Fuse: 3.15 A...2 pcs m.c.c.board for 230V
CN31: Start/
Stop
& Rev.SW.
CN33:
Slide V.R.
CN6
CN12
CN5
CN3
CN1
CN4
CN2 CN8
CN16
CN9
CN10
CN11
CN13
CN14
CN15

Sewing components
1. Height of the needle bar
Remove the face cover, top cover and front panel.
Adjustment
Dimension from the lower end of needle bar pin to the race face of hook : 28.72 mm
In case needle attached incline the angle from which the needle hole is visible by 0 to 5º to the right.
(Hitched stitch prevention at the time of reverse stitch)
How to adjust
1. Make a gauge needle by cutting a household use needle to the length of 28.72 mm and attach it to the
needle bar.
2. Lower the needle bar up to the lowest lead point, and slightly loosen the needle bar bushing set screw
the extent that the needle bar does no slip down.
3. Move the needle bar up or down by hand and turn the needle bar by 10 to 5º as shown in the figure so that the cut
face of the gauge needle is aligned with the race face of the hook.
4. Temporarily tighten screw , and after re-checking the adjustment condition, tighten further the screw.
2. Needle entry (lateral) in the throat plate (needle plate)
Remove the top board.
Bring the needle to the
straight stitching position.
How to adjust
Loosen screw in the
needle entry adjusting collar.
Adjust the needle entry by
turning adjusting collar .
3. Height of the presser foot
Remove the face plate cover. (Page 5)
Left the presser foot until the sole of the
presser foot is positioned 5.5 mm above
the top surface of the throat plate
(needle plate).
How to adjust
Loosen presser bar position bracket, and
adjust the height of presser foot.
Adjust the orientation of presser foot
so that it is in parallel with the groove
in the throat plate (needle plate).
[5] ADJUSTMENT
-13--13-
-13--13-
-13-
j
k
j
j
Needleholeinthethroatplate(needleplate)
j
k
Screw in the
needleentry
adjusting collar
Needleentry
adjusting collar
Recessed
groove
Needle
(Front)
Gaugeneedle
Cut
28.72 mm
5º
0
Lowest dead point
Over hook
Race face
j
5.5 mm ± 0.3
j
Screw in the presser bar
position bracket 2.5, hexagon
Presser foot
Throat plate
(needle plate)

-14--14-
-14--14-
-14-
4. Height of the feed dog
Remove the throat plate (needle plate) to check the adjusting place.
How to adjust
1. Height of the feed dog is the height of the feed dog portion corresponding to the position of the needle hole
center of the throat plate (needle plate) measured from the upper surface of the throat plate (needle plate).
2. Insert a hexagonal screwdriver into the hole for the screwdriver located in the rear side of the free arm, and
loosen the hexagonal screw (1.5 mm).
3. Insert a small slit screwdriver form the small hole in the throat plate (needle plate), turn the adjusting screw and
adjust so that from the upper surface of the throat plate (needle plate) to the upper end of the feed dog should
become 0.9 to 1.1 mm when the feed dog is at its height point.
4. After the adjustment, tighten the screw .
5. Adjusting the needle to hook timing
Remove the throat plate (needle plate), bed base, and free arm lower cover.
Checking method
1. Select the straight stitch (left position)
2. Check the needle entry point and the height of the needle bar are correct.
3. Remove the throat plate (needle plate).
4. Turn the hand wheel to place the needle bar at its lowest dead point.
5. Further turn the handwheel by hand to raise the needle bar little by little, and stop
the needle bar at the point B where the center of the needle is aligned with the tip of blade point of hook.
At this time, check that the dimension C from the tip of the blade point of the hook to the upper end of the
needle hole is 1.5 to 1.8 mm.
If the dimension is not correct, perform following adjustment.
How to adjust
1. Loosen the 2nd set screw in the hook driving gear.
2. Set the zigzag width to 5 mm. (Select “03” and make max. needle throw.)
3. Turn the handwheel by hand, and loosen the 1st set screw in the hook driving gear and move the gear in the
rotating direction so that the tip of the blade point of the hook comes to the center of the rear side of the needle
when the needle throws to the right side and the needle bar comes up (1.7 ± 0.075 mm) from the lowest dead
point.
At this time, pay attention to both the rotating direction and the axis direction, and adjust by temporarily
tightening the 1st set screw as the black lash of the hook driving gear with the hook side gear changes according
to the position of the hook driving shaft direction of the hook driving gear.
Outer hook
2nd Set screw
Zigzag width 5 mm
(Right position)
Lowest dead point
1.7 mm (Large)
1st Set screw
Back lash
(Small)
Lowest dead point
B
Straight stitch
(left position)
C: 1.5 to 1.8mm
0.9 to 1.1 mm
j
k
j
j
k

Remove the front panel. (Page 6)
A clearance of 0.02 to 0.07 mm should be
provide between the center of the needle and
the blade point of the hook when the needle
which is ascending from its lowest dead point
meets the blade point.
Check the clearance with the left and right
needle entry points.
How to adjust
6-1 Loosen screw in the stopper and clamping
screw in the needle bar frame stud.
Adjust the clearance between the needle
and the blade point using adjusting
screw .
6-2 If the clearance between the blade point and
the left-hand side needle is different from
that between the blade point and the right-
hand side needle, loosen screw , and
move needle bar frame stud (asm.) in the
right or left.
* Tightening screws and change the
clearance. Check the clearance with the
screws tightened. Tighten screw while
pressing the stopper against the frame.
Remove the throat plate (needle plate).
Press the detent plate of inner hook
against the detent plate attaching boss.
How to adjust
Loosen screw , and adjust the position
of the detent plate.
* Inner hook should be flash with the
detent plate.
-15--15-
-15--15-
-15-
6. Clearance between the needle and the blade point
7. Position of the detent plate of the inner hook
(position of the bobbin case opening lever)
j
k
l
m
n
m
kl
j
k
jScrew in the stopper
Needle
Bladepoint
0.02 to
0.07 mm
m
n
Screw in the needle bar
frame stud guide
Needle bar frame
stud (asm.)
k
l
Clamping screw of the
needle bar frame stud
Adjusting of the needle
2.0 mm, hexagon
Hook cover receiving plate (right)
j
k
lClearance to allow the thread
to come off the inner hook
Detent plate attaching base
Screw in the inner
hook detent plate
Should be flush
with each other
Innerhook

-16--16-
-16--16-
-16-
8. Adjust the longitudinal feed
Preparation for adjustment
1. Hold pressing the start/stop button after turning OFF the power switch. Then turn on the machine so that,
the pattern is changed over to the pattern for adjusting the darning, and “dr” is displayed in the LCD.
How to adjust
(Program for adjustment)
The sewing conditions
2. 2-layer cotton broad, Dual Duty #50 (for both needle and bobbin threads) and automatic high speed
3. Sew three pieces or more of the stitch pattern under the conditions of step 2) above.
Turn the pattern adjusting knob so that the last seam of “B” is overlapped as illustrated in the figure below.
4. Sew BH (buttonhole) and check the stitch pitch.
5. After the adjustment, in case the screwdriver groove of the pattern adjusting knob is not flush, remove the
cover of the pattern adjusting knob and rearrange so that the knob is in the flush position.
Start of sewing Reverse feed is large.
Removing the cover
Insert a small-sized
slit screwdriver into
the cover and raise it
in the direction of the
arrow mark.
Adjust from the
third pattern.
Normal feed
is large.
Flush
Pattern adjusting knob
Power switch OFF Start/stop button Power switch ON
Straight stitch button
dr
LCD display

9. Buttonhole change-over switch
Remove the top cover. (Page 5)
Adjustment
1. Attach the BH (buttonhole) presser foot in place and lower the presser foot.
2. Lower the BH (buttonhole) change-over lever.
3. Select BH (buttonhole) (#13). Normally, in this state, BH (buttonhole) error mark is not indicated on the LCD
indication panel.
4. Loosen screws and in the BH (buttonhole) switch base Y.
When Y is moved while using screw as a fulcrum, the BH (buttonhole) error mark is indicated.
5. Gradually move Y in the direction to make the BH (buttonhole) error mark go out, stop Y at the position where
the mark goes out, and tighten screws and .
In addition, move the presser foot up or down to check that the mark goes out.
6. Place a sheet of paper under the BH (buttonhole) presser foot and make the sewing machine run idle without
threading to check the return position of the buttonhole and stop state. Perform re-adjustment if there is any
trouble.
When these tests are OK, thread the machine head and perform the test sewing of the buttonhole.
10. Vertical position of automatic threader hook
Remove the front panel. (Page 6)
The clearance provided between the top end of hook and the top end of the needle eyelet should be
adjusted to 0.
How to adjust
Bring the needle bar to its highest dead point.
Now, you can see the screw in the threading needle bar guide through clearance .
Loosen the screw, and adjust the position of the threading hook by moving the guide up or down.
-17--17-
-17--17-
-17-
jk
j
BH (buttonhole)
switch base Y
k
Screw in the
switch mounting
base
Screw in the switch
mounting base
Top end of the
needleeyelet
jScrew in the threading needle
bar guide 1.5 mm hexagon.
Top end of two hook
j
jk
j
BH(buttonhole)
error mark
k
k

11. Adjusting the tension
11-1. Principles of the thread tension mechanism
1. There are thick threads to thin threads. Normal thread tension unit adjusts the thread tension by one thread
tension unit against each thread.
HZL-T100, by adopting the principle by which the tension is individually secured according to the thickness of
the thread used, enable the users to adjust the thread tension with ease.
[Principle diagram]
[Role]
· Base tension (untwisiting)
Base tension performs to remove the twisting so as the thread twisting not to enter the thread paths.
(Attached in the rear side of the arm cover.)
· Pre-tension
Pre-tension is located at clearance A to
correspond to tick thread and gives the tension
to think thread.
Thick thread is given the necessary tension
mainly by (1) + (2) + (3).
· 1st tension (main tension)
This tension basically gives the tension to thin thread.
This tension has the function of manual tension adjustment as well.
· 2nd tension
This tension is located at clearance B for medium-weight thread to correspond to medium-sized thread.
Medium-weight thread is given the proper tension mainly by (2) + (3).
2. External adjusting function to re-set the thread tension is provided for users’ choice.
The mechanism that the tension cam holds the dial can disengage the engagement of the both ratchets
by inserting a small-sized slit screwdriver or the like.
By shifting the both position in this state, re-setting of the dial granduation can be performed.
[Configuration diagram]
How to adjust
· In case adjusting the tension after assembling the front panel and arm cover is desired, the dial of 1st tension
can be adjusted because of the machine construction.
1. By inserting a small-sized slit screwdriver into the center of the groove located in the rear side of the tension
knob, the engagement of the knob and the tension cam be disengaged.
2. Adjustment can be performed by moving the tension cam or the knob to the right or left. However, the
adjustment should be performed within the 4th tooth of the right or left side.
In case the adjustment more than 4th tooth is necessary, re-check the tension components.
(For the angle, the adjustment is in the range of 15º left or 15º right. For the reference there are 4 small
holes at the rim of the knob and the angle between the respective small holes is in a unit of 15º each.)
-18--18-
-18--18-
-18-
Thread thickness and effect tension
Thread thickness
Thin
Medium
Thick
(1) Pre-tension (2) 1st tension (3) 2nd tension
(1) Pre-tensionBase tension (2) 1st tension
A
(3) 2nd tension
B
Tooth
Tension cam
Engage section
1st tension How to disengage
Dial
(Front) (Rear)
Screwdriver
Aligningmark 4th tooth 15º Small hole
15º
4th tooth