JUKI HZL-X Series User manual

SERVICE MANUAL
HZL-X Series
COMPUTER SEWING MACHINE

Be sure to observe the following to protect against a re, electrical shock, injury or damaged components.
* Be sure to unplug the machine before disassembly, assembly or adjustment of the machine.
* Be sure to carefully prevent electric cords from being caught, coated surfaces from being damaged as well
as wrong wiring during assembly.
* Be sure to use the proper genuine parts when changing any of the machine parts.
CAUTION:
CONTENTS
[1] Specications of HZL-X Series ............................................................................1
[2] Search by trouble (related to mechanical components) ...................................3
[3] Principal parts .......................................................................................................4
[4] Disassembling the machine covers ....................................................................5
[5] PCB connection diagram .....................................................................................9
[6] Adjustment ..........................................................................................................13
6-1 Adjusting the needle bar height ................................................................13
6-2 Adjusting the needle entry point ...............................................................14
6-3 Feed dog height ..........................................................................................14
6-4 Timing belt ...................................................................................................15
6-5 Feed timing ..................................................................................................15
6-6 Timing between the needle and the hook .................................................16
6-7 Clearance between the needle and the blade point of hook ...................17
6-8 Position of the hook rotation stopper plate .............................................18
6-9 Adjusting the bobbin thread tension ........................................................18
6-10 Adjusting the disk opening amount ........................................................19
6-10-1 Adjusting the thread tension release adjusting plate ................................19
6-10-2 Pretension disk opening amount .................................................................19
6-10-3 Tension disk opening amount ......................................................................20
6-10-4 Base tension opening amount .....................................................................20
6-11 Adjusting the needle thread tension .......................................................21
6-12 Vertical position of the needle threading hook ......................................22
6-13 Adjusting the auxiliary hook height ........................................................23
6-14 Adjusting the opening amount of auxiliary hook ...................................24
6-15 Adjusting the presser bar height .............................................................24
6-16 Motor belt ...................................................................................................25
6-17 Automatic thread trimming ......................................................................26
6-17-1 Lateral position of the thread trimming mechanism base .........................26
6-17-2 Phase of the catching unit driving cam .......................................................27
6-17-3 Replacing the thread trimming blade ..........................................................28
6-18 Longitudinal feed ......................................................................................29
6-19 Knee lifting wire ........................................................................................30
6-20 Automatic presser foot lifting ..................................................................31
6-20-1 Auto-lifter cam lever ......................................................................................31
6-20-2 Presser-lifter position sensor .......................................................................32
6-20-3 Adjusting the height of the presser foot when it is lifted ...........................33
6-21 Straight stitch slide plate .........................................................................35
6-21-1 Adjusting the position of the straight stitch slide plate .............................35
6-21-2 Straight stitch slide plate sensor PCB .........................................................36
6-22 Service mode .............................................................................................37
6-22-1 Service mode screen .....................................................................................37
6-22-2 Service-mode items and descriptions .........................................................37

– 1 –
(1) Power switch
• 220-240V AC common to 50/60 Hz
• 120V AC common to 60 Hz
(2) Power consumption
• 75 W
(3) Dimensions and weight
• Dimensions Main unit: 445 (width) × 210 (depth) × 290.5 (height) (mm)
Case set: 510 (width) × 257 (depth) × 305 (height) (mm)
• Weight Main unit: 10.3 kg
(4) Revolution control
• Slide style speed control
Straight stitch 80 to 1,050 sti/min (SPM)
Pattern stitch 80 to 750 sti/min (SPM)
Reverse stitch 80 to 1,050 sti/min (SPM)
 (Sewingspeedotherthanthespeciedrangecanbesetoptionally.)
80 to 1,050 sti/min (SPM) (when the speed controller is used.)
Bobbinwinding 1,500to3,000sti/min(RPM)
Low-speed start 80 to 110 sti/min (SPM) (approx. 1 second only when the power switch is turned ON.)
• Foot controller
Evenwhenthefootcontrollerisused,thespeedcontrolfunctionbymeansoftheslideriseffective.
Tostopthemachine,eitherreleasethefootcontrollerorpressstart/stopbutton.
Thenumberofrevolutionsiscontrolledinthewaysamewiththecaseoftheslidespeedcontrol.
Toe-uppedalingfunctioncanbesetoptionally.
• Safety control
When the motor shaft of the sewing machine is accidentally constrained, the power supply to the motor is
stopped within two seconds.
Whenthemotorisoverheated,thebuiltinthermalswitchstopsthepowertothemotor.
Notethatthemachinecanberestartedoncethemotorspontaneouslycoolsdown.
(5) Stop position
•Uponnishingsewing,themachinestopsaccordingtothepresetneedlestopposition(withitsneedleupor
down).
•Uponnishingreversestitching,themachinestopswithitsneedledown.
• Needle moves down when the machine has preset so that the needle stops at its up position and needle up/
downbuttonispressed.
• Needle moves up when the machine has preset so that the needle stops at its down position and needle up/
downbuttonispressed.
• In the case of fault, the machine stops immediately (stop position varies).
(6) Zigzag width
• Max. 7 mm depending on the pattern selected
(7) Amount of feed
•Theamountoffeedischangedinincrementsof0.2mmbythestitchlengthadjustingdial(orbutton).
 (Fortheparallelpartsofabuttonholeandsatinstitches,theamountfeedischangedinincrementsof0.1mm.)
Default setting: 2.4 mm (for straight stitching)
[1] Specications of HZL-X Series

– 2 –
(8) Pattern selection
• 10-pattern direct selection: MENU key + Numeric keys
• Dot-matrix LCD
(9) Number of patterns that can be selected
• Max. 70 patterns
(10) Number of patterns
• HZL-DX7 : 300
• HZL-DX5 : 200
(11) Automatic threading device
•Thehooksectionmakesaturnbyloweringthethreadinglever,andautomaticallyreturnstoitsoriginalposition
after completion of threading.
(12) Automatic lock stitch
WhenthebacktackingswitchisturnedON:
• Straight stitch: Three stitches are sewn in normal direction and three stitches are sewn in reverse direction at
thebeginningandend(thereverseswitchisturnedON)ofsewing.
Amount of feed: Same with the preset amount of feed
• Other patterns: Zero-feed is inserted and one each stitch is sewn in the normal and reverse directions at the
beginningandend(thereverseswitchisturnedON)ofsewing.
Amount of feed: Fixed at 0.6 mm
(13) Buttonholing
Auto-returntypefullautomaticbuttonholing
Buttonholing size detection
(14) Save and call patterns
Selectedpatternsandpatternsettingscanbestoredinmemory.
Inaddition,thepatterncanbecalledupfrommemoryforsewing.
Numberofpatternsthatcanbestoredinmemory:10(folders)
(15) Helpful messages
• Presser foot lifting lever
• Buttonholing foot
• Display of pattern storage limitation
• Pattern clear prompt
• Memory storage
• Acceptance of setting change
• 2-needle setting
• Motor lock
• Straight stitch selection

– 3 –
[2] Search by trouble (related to mechanical components)
Phenomenon Item to be checked
Faulty thread tension 6-8: Position of the hook rotation stopper plate
6-9: Adjusting the bobbin thread tension
6-10-2: Pretension disk opening amount
6-10-3: Tension disk opening amount
6-10-4: Base tension opening amount
6-11: Adjusting the needle thread tension
Stitch skipping 6-1: Adjusting the needle bar height
6-2: Adjusting the needle entry point
6-5: Feed timing
6-6: Timing between the needle and the hook
6-7: Clearance between the needle and the blade point of hook
Thread breakage 6-1: Adjusting the needle bar height
6-6: Timing between the needle and the hook
6-8: Position of the hook rotation stopper plate
Hitch stitch 6-2: Adjusting the needle entry point
Faulty material feed 6-3: Feed dog height
6-15: Adjusting the presser bar height
Contact between needle and throat plate
or hook
6-2: Adjusting the needle entry point
6-5: Feed timing
6-6: Timing between the needle and the hook
Faulty pattern shape 6-3: Feed dog height
6-18: Longitudinal feed
Faulty automatic thread trimming 6-17-1: Lateral position of the thread trimming mechanism base
6-17-2: Phase of the catching unit driving cam
6-17-3: Replacing the thread trimming blade
Faulty operating noise 6-4: Timing belt
6-16: Motor belt
Needle threader 6-12: Vertical position of the needle threading hook
Fails to start sewing 6-20-1: Auto-lifter cam lever
6-20-3: Adjusting the height of the presser foot when it is lifted
Faulty automatic presser foot lifting height 6-19: Knee lifting wire
6-20-1: Auto-lifter cam lever
6-20-2: Presser-lifter position sensor
6-20-3: Adjusting the height of the presser foot when it is lifted
Straight stitch slide plate 6-21-1: Adjusting the position of the straight stitch slide plate
6-21-2: Straight stitch slide plate sensor PCB

– 4 –
[3] Principal parts
Lockstitchbutton
Hand wheel (pulley)
Power switch
Machine-socket-inlet
Foot-controller-jack
Spool cap (large)
Spool pin
LCD Screen
Operational
buttons
Face cover
Threading lever
Start/stopbutton
Auxiliarybed
(accessory case)
Presser foot lifting lever
Dropfeedknob
Needle setscrew
Needle
Presser foot
Sensorpinholeforbuttonholing
Presserfootreleasingbutton
Feed dog
Throat plate
Hook cover
Bobbinwinding
shaft
Hookcoverreleasebutton
Presser foot holder setscrew
Presser foot holder
Threadtrimmingbutton
Hard case
Widetable
* Do not put heavy ob-
jects onto hard case
and wide table.
* Do not remove the
styrene foam tted
inside the hard case.
If it is removed, the
sewing machine can
be damaged when it
is placed in the hard
case or other prob-
lems can occur.
Thread cutter
Reverse stitch
button
Speed controller
Needleup/downbutton
Presserfootpressureadjustmentdial
Thread tension
adjustmentdial
Knee lifting lever
hole
Light under arm
DX7 Only
DX7 Only
Presserfootautoliftbutton
Straight stitch slide plate
Straight stitch slide plate lever

– 5 –
○Toremovethetopcover,bowthehingesectionoftherightsideofthecover.
○Remove setscrews 1and 2from the face cover.
Then, remove the face cover.
○Remove setscrews 3and 4from the throat plate.
Then remove the throat plate.
[4] Disassembling the machine covers
1) Top cover
2) Face cover
3) Throat plate
1
2
34

– 6 –
○Remove setscrew 5from the thread tension cover.
Remove the thread tension cover.
○Remove setscrews 6to !0 from the spool cover.
○PulloutthecableofbobbinwindermotorfromthemicrocomputerPCB.
○Remove the spool cover from the main unit of the machine, paying attention to
thebasetension.
○Remove setscrews !1 and !2fromthebottomcoverofthefreearm.
 Removethebottomcover.
4) Spool cover
5) Bottom cover of the free
arm
6
7
8
9
!0
5
Microcomputer PCB
Base tension
!1
!2

– 7 –
6) Bed cover ○Remove setscrews !3 to !5fromtherubbercushionofthebedcover.Remove
setscrew !6fromthebedcover.RemovesetscrewB!7fromthebedcover.
Pulloutthebedcoverfromthemetalplate!8 in the direction of the arrow.
○Remove setscrew !9 from the upper cover of the free arm.
Remove the upper cover.
○Remove setscrews @0 and @1 from the face plate cover.
Remove the face plate cover.
7) Upper cover of the free
arm
8) Face plate cover
!9
@0
@1
!3
!4
!5
!6!7 !8

– 8 –
9) Front panel ○Remove setscrews @2 and @3 from the front panel.
○Put a thin screwdriver in the notch in the rising section under the arm and pry
off the front panel and hook Aof the rear panel.
○Opening the right side of the front panel in the direction of the arrow, tap Z
section with your hand to remove hook Blocatedatthebedsurface.
○Lastly, remove hook Clocatedatthelowersideofthemachinejaw.
○Remove connectors for SUMI-card, start switch, LED lamp and microcomputer
panelI/FcablefromthemicrocomputerPCBwhennecessary.
@4
@5
@6
10) Rear panel ○Remove setscrews @4, @5 and @6 from the rear panel.
Remove the rear panel with the presser foot lifting lever raised.
@3
@2
Notch
A
B
C
Z
Open
Microcomputer PCB

– 9 –
[5] PCB connection diagram
• Microcomputer PCB (Common to HZL-X Series)
Connec-
tor No. Destination Termi-
nal No.
CN1 On hand LED PCB 1 1 5V
CN2 Under arm LED PCB 1 5V
CN3 On hand LED PCB 2 1 5V
CN4 Bobbinwinding
motor
1Bobbinwinderswitch
2 GND
3Bobbinwindermotor(+)
(29V)
4Bobbinwindermotor(-)
CN5 Presser-lifter STM
position detection
PCB
1 5V
2 Detection signal
3 GND
CN6 Flash memory inter-
face
1 5V
6 GND
CN7 OST SW (Not in-
stalled)
1Presser foot lifting switch
2 GND
CN8 BH SW 1 GND
2 BHR SW
3 BHS SW
4 5V
CN9 Main shaft detection
PCB
1 5V
2 Motor pulse
3 S1
4 S2
5 S3
6 GND
Connec-
tor No. Destination Termi-
nal No.
CN10 SW/slide volume
PCB
1 LED G
2 LED R
3 Reverse stitch switch
4 S/S switch
5 Thread trimming switch
6 Needle up/down switch
7 Auto-lifter switch
8 Lock stitch switch
9 GND
10 Speedcontrolvariable
resistor
11 NC
12 5V
CN11 Presser-lifter STM 1 A8.5Ω
2 A
3 B 8.5Ω
4B
CN12 Thread trimming
STM original
point detection
PCB
1 Detection signal
2
3 GND
CN13 Presser-lifter STM
original point
detection PCB
1 Detection signal
2
3 GND
CN14 Needle throwing
STM
1A5.0Ω
2 A
3 B 5.0Ω
4B
CN15 Panel PCB 1-3 LED
4-7 Switchstrobe
8-11 LCDbacklight
12-16 LCD signal
17 3.3V
18 GND
19-22 Rotary switch
23-29 Switch data
30 GND
CN16 For factory 2 GND
4 GND
CN17 Microcomputer
panelI/Fcable
(asm.)
1 5V
2UART Tx
3 UART Rx
4 Clock signal
5 GND
CN18 Feed STM 1 A4.0Ω
2 A
3 B 4.0Ω
4B
CN22
CN20
CN16
CN17
CN24
CN25
CN26
CN15
CN9CN8CN6CN4CN3
CN5 CN7
CN1
CN2
CN10
CN23
CN13CN12
CN11
CN14
CN18
CN19
CN21
電源コントローラー製造用パネルI/F
主軸検知BH フラッシュ書込み 下糸巻きLED2
LED1懐LED
スイッチスライドVR
糸切り原点押え針振り送り
糸切り
スライド針板
押え原点
押え高さ 押え上げ
(予備1)(予備2)(予備3)
模様選択
メインモーター
WHT BLU RED BLK WHT
GRN WHT
WHT WHT GRN
RED
WHT WHT
WHT BLU
BLK
WHT
WHT
WHT
WHT
WHT

– 10 –
Connector No. Destination Terminal No.
CN19 Thread trimming STM 1 A8.5Ω
2 A
3 B 8.5Ω
4B
CN20 Controller socket 1 GND
2 Controller
CN21 MotorlterPCB 1 Main motor (+) (29V)
2 Main motor (-)
3 FG
CN22 Power supply relay lead
wire
1 30V
2 30V
3 NC
4 GND
5 GND
CN23 Straight stitch slide plate
sensor PCB
1 Straight stitch slide plate switch
2 GND
CN24 Reserve 1 (Not installed) 2 GND
CN25 Reserve 2 (Not installed) 3 GND
CN26 Reserve 3 (Not installed) 1 5V
3 GND
• Power PCB
Connector No. Destination Check
CN1 Power SW AC input
CN2 Power supply relay lead wire 1-2PIN 29V, 4-5PIN GND (FG)
CN1
CN2

– 11 –
• Display PCB
HZL-DX7 HZL-DX5
To be connected to CN15 of microcomputer PCB To be connected to CN15 of microcomputer PCB
Connector No. Destination Terminal No.
CN1 Touch switch sheet 1 GND
2-29 Touch switch signal
30 GND
CN2 MicrocomputerpanelI/Fcable(asm.) 1 5V
2UART Tx
3 UART Rx
4 Clock signal
5 GND
CN1
CN2
タッチスイッチシート
マイコン基板I/F
CN1
CN2
タッチスイッチシート
マイコン基板I/F

– 12 –
• Connection block diagram
CN1 CN2
2P
手元LED基板1
懐LED基板 2P
CN3 CN4
CN5
CN6
CN7
CN8 CN9
手元LED基板2
2P
糸巻きモーター
4P
押え上げSTM位置検知基板
フラッシュ書込み
BHスイッチ
3P
6P 4P
主軸検知基板
6P
CN10
スイッチ/スライドVR基板 12P
CN23
2P
スライド針板センサー基板
CN12 CN13
3P 3P
押え上げ原点検知基板
糸切り原点検知基板
CN11
4P
押え上げSTM
CN14 CN18
4P 4P
CN19
4P
針振りSTM
送りSTM 糸切りSTM
CN21
3P
メイン
モーター
CN26 CN25 CN24
CN17 CN16
CN15
30P
5P 4P
CN20 CN22
2P 5P
電源基板 電源スイッチ 電源コード
製造用
コントローラーソケット フットコントローラー
CN2 CN1
5P 30P
LCD
128×64
タッチスイッチシート
モーターフィ
ルタ基板
BLUE WHITE
パネル基板
未使用 未使用 未使用
未使用
CN2
CN1 2P
2P
電源供給リード線
DC29V
マイコンパネル
I/Fケーブル組
Presser-lifter STM position
detection PCB BH SW
Main shaft detection PCB
Panel PCB
Touch switch sheet
Foot controller
Bobbin winding motor
On hand LED PCB 2 On hand LED PCB 1 Under arm LED PCB
SW/slide volume PCB
Straight stitch slide plate sensor PCB
Presser-lifter original
point detection PCB
Presser-lifter STM Needle throw- ing STM Feed STM Thread trim- ming STM
Main motor
Flash memory interface
Unused
Unused Unused
For factory
Unused
Motor lter PCB
Thread trimming origi- nal point detection PCB
Microcomputer pan- el I/F cable (asm.)
Controller socket
Power supply relay lead wire
Power SW Power cord
Power supply PCB

– 13 –
[6] Adjustment
6-1 Adjusting the needle bar height
○Remove the face cover.
Adjustmentvalue:
・
Distancefromthebottomendofthepininsideneedlebarsurfacetothetopsurfaceofthethroatplate:
19 mm
・
Whentheneedleismounted,theneedleeyetiltsrightwardby2degrees.
Adjustmentprocedure1.
 1.Selectthestraightstitchusingthepatternselectingbutton.Choosecenterneedleposition.
 2.MakeagaugeneedlebycuttingahouseholdneedleHA×1todimensionA.Fitthegaugeneedleintothe
needlebar.
3. Prepare an appropriate metal plate of thickness B. (A = 19 mm - B)
 4.Bringtheneedlebartoitslowestdeadpoint.Slightlyloosenneedlebarconnectingstudsetscrew1as
long as the needle does not slip off from the connecting stud.
 5.Placethemetalplateonthethroatplate.Movetheneedlebarupanddownbyhandtoadjustsothatthe
cutsurfaceofthegaugeneedlealignswiththetopsurfaceofthemetalplate.Then,turntheneedlebarby
twodegreesofanangleasillustratedinthesketchbelow.
 6.Temporarilytightenneedlebarconnectingstudsetscrew1andreconrmthattheneedlebariscorrectly
adjusted.Then,securelytightenthesetscrew.
Adjustmentprocedure2.
 1.AssembleahouseholdHA×1needle#14intotheneedlebar,bringtheneedlebartoitshighestdead
point.Movetheneedlebarinthesamewayasdescribedinprocedure1toadjusttheneedlebarheightso
that the needle tip is spaced 15.5 mm from the top surface of the throat plate.
19 mm
Metal plate
Throat plate
2°
[Lowest dead point]
A
B
Gauge needle
15.5 mm
[Highest dead point]
HA×1 #14
1

– 14 –
6-2 Adjusting the needle entry point
○Remove the face cover.
Adjustmentprocedure
 1.Selectthestraightstitchusingthepatternselectingbutton.Choosecenterneedleposition.
 2.Assembleaneedle#14intotheneedlebar,loosenthesetscrewintheeccentriccollarandadjustthefeed
bareccentriccollarsothattheneedlemeetsthecenteroftheneedleslotinthethroatplatewhenitreach-
esthetopsurfaceofthethroatplatebyturningthehandwheel.
6-3 Feed dog height
○Do not remove the throat plate.
Adjustmentprocedure
1. Set the amount of feed to 0 (zero).
 2.Turnthehandwheeltobringthefeeddogtoitshighestdeadpoint.
 3.Turnleftsideshaftaandrightsideshaftbwitha2mmhexagonalwrench.
 4.Adjustthefeeddogheightsothatthefrontandrearendsofthefeeddogarespaced1.0±0.1mmfrom
the top surface of the throat plate.
Adjusttherearendheightofthefeeddogwithshafta,andfrontendheightwithshaftb.
Setscrew
Feed bar eccentric collar
Shaft a Shaft b
Shaft a
Shaft b
1.0 ± 0.1 mm 1.0 ± 0.1 mm

– 15 –
6-4 Timing belt
○Remove the front panel and the microcomputer PCB.
Adjustmentprocedure
 1.Loosenthesetscrewintheidlermountingbaseandloosenthetimingbelt.
 2.Turnthehandwheeltobringtheneedlebartoitslowestdeadpoint.
 3.Turnthehookdrivingshafttobringthefeeddogtoitslowestdeadpoint.
 4.Carefullykeepingtheconditiondescribedinsteps2and3,setthetimingbeltonthehookdrivingshaft
pulley(bytemporarilytighteningthesetscrewintheidlermountingbase)sothatthesetscrewNo.2inthe
pulleyisbroughttojustundersideofthepulley.
 5.Applying0.98±0.29Nforcetotheidlerbymeansofaspringscale,securelytightenthesetscrew.
Push the middle part of the screw
with the spring scale.
Setscrew of the idler mounting base
The setscrew No. 2 is located just underside of the hook driving shaft pulley.
6-5 Feed timing
○Aftercheckingthefeeddogheightandtheneedlebarheight,carryoutadjustmentofthefeedtiming.
Adjustmentprocedure
 1.AssembleaHA×1needle#14intotheneedlebar.
2. Loosen setscrew No. 2 in the hook driving shaft pulley.
 3.LoosensetscrewNo.1inthehookdrivingshaftpulley.Adjustthepulleysothatthelowerendofthe
needleeyeinthedescendingneedle#14isalignedwiththetopsurfaceofthethroatplatewhenthetop
surfaceofthedescendingfeeddogisalignedwiththetopsurfaceofthethroatplatebyturningthehand
wheeltowardyou.Afteradjustment,tightenthesetscrewNo.2.
 4.Turnthemainshaftbyonerevolutiontoconrmthetiming.
Setscrew No. 2
Setscrew No. 1
0.98 ± 0.29 N
The lower end of the needle eye in needle
#14 aligns with or is 1 mm or less above
the top surface of the throat plate.
Top surface of the feed dog
aligns with the top surface
of the throat plate.

– 16 –
6-6 Timing between the needle and the hook
○Removethethroatplate,thebedcoverandthebottomcoverofthefreearm.
Method for checking
 1.Checktobesurethattheneedleentrypointandneedlebarheightarecorrect.
 2.Selectthestraightstitch.Selecttherightneedlepositionbyusingthezigzagwidthadjustingdial.
(The needle entry point is shifted to the rightmost side.)
 3.Now,turnthehandwheelbyhandtobringtheneedlebartoitslowestdeadpoint.
 4.TurnthehandwheelfurthertograduallylifttheneedlebaruntilpointCwhere the needle center is aligned
withthetipofbladepointofthehookisreached.
 5.Atthistime,checktobesurethatthedistanceDfromthetipofbladepointofthehooktotheupperend
oftheneedleeyeis3.1to3.3mm.Ifthisdistanceisnotcorrectlyprovided,carryoutthefollowingadjust-
ment.
Adjustmentprocedure
 1.Loosenthesetscrewinthehookdrivinggearwhichisnotvisiblefromundersideofthesewingmachine
whentheneedlecenteralignswiththetipofbladepointofthehook.
2. Select the straight stitch and the right needle position. Move the hook driving gear in the rotational direc-
tiontoadjustdistanceDof3.1to3.3mmisprovidedbetweenthetipofbladepointofthehookandthe
upperendoftheneedleeyewhentheneedlebarisliftedby1.6mmfromthelowestdeadpointbyturning
thehandwheelbyhand.
  Atthistime,thebacklashbetweenthehookdrivinggearandthegearonthehooksidemaychangede-
pendingonthelocationofthehookdrivinggearonthehookdrivingshaft.Adjustmentshould,therefore,
becarriedoutwiththevisiblesetscrewtemporarilytightened,whilecarefullyobservingthehookdriving
gearinboththerotationaldirectionandaxialdirection.Adjustthebacklashto0.2to0.7mmontheperiph-
ery of the rotating hook.
 3.Afterconrmingthetimingbetweentheneedleandhookiscorrectlyadjusted,securelytightenbothset-
screws.
(Caution) After adjustment of the hook, the hook race surface and the bobbin case holder may be stained
with dirt, oil or grease. Wipe them off with alcohol where necessary.
If those parts are left stained, chattering or thread slip-off noise of the bobbin case holder can
occur.
Distance D : 3.1 to 3.3 mm
1.6 mm
C
Backlash on the periphery of the
rotating hook 0.2 to 0.7 mm
Rotating
hook
Hook
driving
gear
Backlash
Larger
Smaller

– 17 –
6-7 Clearance between the needle and the blade point of hook
○Remove the face cover and the throat plate.
Adjustmentprocedure
1. Loosen screw 1.Adjusttheclearancebetweentheneedleandthebladepointofthehookto0.02to0.07
mmbyturningadjustingshaft2.
1
2
Left needle position Right needle position Right needle positionLeft needle position
If the clearance is larger at the right needle
entry point, shift 4 to the right.
If the clearance is larger at the left needle
entry point, shift 4 to the left.
Adjustmentprocedure
1. Select No. 2: FAGOTT of the service mode.
 2.Graduallyturnadjustingshaft2tondapositionwheretheneedledeviatesslightly.Now,temporarily
tighten screw 1.
3. Slightly loosen setscrew 3.Adjustthelateralbalanceoftheneedlebarbyslightlymovingright-leftadjuster
4while carefully listening to the noise produced when the needle deviates at the right and left needle entry
points. Then, securely tighten setscrew 3.
4. Additionally turn shaft 2and securely tighten screw 1at the position where the needle does not deviate.
 5.LightlytapPsectionwithngers.Ifyouhearaneedledeviationnoiseattherightandleftneedleentry
points,theoptimumclearanceisprovidedbetweentheneedleandthehook.
1
2
4
3P section
Adjustingthebalanceoftheclearancesattherightandleftneedleentrypoints
 1.Selectthezigzagpatternandsetthezigzagwidthto7mm.Adjustthebalanceoftheclearancesprovided
betweentheneedleandthebladepointofthehookattherightandleftneedleentrypoints.
0.02 to 0.07 mm

– 18 –
6-8 Position of the hook rotation stopper plate
○Remove the throat plate.
Adjustmentprocedure
 1.Whenthebobbincaseholderisplacedinsidetherotatinghook,loosenthesetscrewanddeterminethe
longitudinalpositionoftherotationstopperplatesothattheprojectionofthebobbincaseholderandthe
leafspringoftherotationstopperplatearelocatedasillustratedintheenlargedpartialview.Toadjustthe
lateralpositionoftherotationstopperplate,presstheplateintherightdirectionbytheamountofplayand
secure with the setscrew.
 *Thehookracesurfaceandthebobbincaseholdermaybestainedwithdirt,oilorgrease.Wipethemoff
with an alcohol-soaked cloth where necessary.
  Ifthosepartsareleftstained,chatteringorthreadslip-offnoiseofthebobbincaseholdercanoccur.
6-9 Adjusting the bobbin thread tension
○Remove the throat plate.
Adjustmentprocedure
 1.Positionthebobbincaseholderandatensiongaugeasillustratedinthesketchbelow.UsingSHAPPE
Spanthread#60,adjustthebobbinthreadtensionto0.13±0.02Nwiththeadjustingscrew.
  Atthistime,carefullypreventthebobbinthreadfromcomingincontactwiththethroatplateorotherrelat-
ed parts.
Setscrew
Adjust so that the projection and
leaf spring are aligned with this line.
Adjusting screw
Adjusting screw
Enlarged partial view