JUKI FLS-350N Series Engineer'S Manual Download

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11. CIRCUIT DIAGRAM

(1) Layout drawing of the control box

Switch regulator

+12 V

GND

White

Black

CN6

2
3
4
5
6

Stitch length adjusting variable resistor

CN6

1
2
3
4
5

Yellow

Red

Brown

Green

White

Black
Black

2
3

4
5
6

2
3

+12 V

GND

4
5
6

+5 V

Stitch length adjusting variable resistor input

GND

Stitch length adjusting selecting switch input

GND

With/without adjusting
With/without adjusting

Control printed circuit board

25209958

+12 V
+12 V

Speed variable resistor
Speed variable resistor

Speed variable resistor

Upper stitch length setting variable resistor
Upper stitch length setting variable resistor

Upper stitch length setting variable resistor

Lower stitch length setting variable resistor
Lower stitch length setting variable resistor

Lower stitch length setting variable resistor

Stitch length selecting switch

GND
GND

3
4

5
6

12
13

14
15
16

Stitch length selecting switch NC

GND

Stitch length selecting switch NO

2
3

-CCW

+CCW

-CW

+CW

GND

Reverse stitch switch input

Reverse stitch power sensor input

Feed motor power sensor input

Feed timing sensor input

Upper/lower feed sensor input

+12 V

GND

Speed command output

4 3 2 1

Black

White

Green

Red

12 11

9 8 7 6 5 4 3 2 1

Yellow

Purple

Blue

Green

Red

Brown

Orange

Black

White

Black

Stepping motor driver

CW+

CW-

CCW+

CCW-

A
A
B
B

COM A

COM B

1
2
3
4

6
7
8

Red
Green
White

Black
Brown
Red
Yellow
Green
White
Black

Yellow

AC100 V

Yellow

Red

Yellow

Green

White

Black

CN9

1
2
3
4
5

A
B

COM A
COM B

CN9

4
5
6

Black
Green
Yellow
Red
Blue
White

(Feed amount determined)

Red

Orange

Yellow

Black

White

Black

Terminal board

(+12V)

201

(Upper/lower feed sensor)

202

(Feed timing sensor)

(+12 V)

203

(Feed motor origin sensor)

204

(Reverse stitch origin sensor)

205

(Reverse stitch switch)

301

302

(Speed command)

303

Brown

Black

Brown
Brown

Blue

Black

Blue
Blue

White

Black

White

Black

(GND)

7. NC
6. UDET
5. +5 V
4. SG
3. SG
2. X-DET
1. D-DET

Encoder output

Drive output

SC-1

CN3

CN92

CN91

1
2

CN6

Black

White

4
5

CN6

1
2
3

GND

Speed command

CN3

CN92

CN91

2
3
4

NS-1

NS-3

NS-2

NS-4

PB-5

201

202

203

204

205

Upper/lower feed sensor

Feed timing sensor

Feed motor origin sensor

Reverse stitch origin sensor

Reverse stitch switch

Main motor

Brown

Blue

Green/Yellow

200V

SYNC

Control printed circuit board JA

M8601351JAAA

6
7
8

11
12
13

14
15
16

+12 V
+12 V

VR-1A

Machine rotation speed
setting variable resistor

VR-2A

VR-3A

PB-3

Upper/lower
stitch length
selecting
switch

3
4
5

7
8

10
11

12
13
14
15
16

3
4
5
6
7
8

10
11
12

13
14
15
16

Black

Black/White

Red

Red/White

Green

Green/white

Yellow

Yellow/White

Brown

Brown/White

Blue

Blue/White

Gray

Gray/White

Stitch length adjusting variable resistor

Stitch length adjusting selecting switch

Short : With adjusting

Open : Without adjusting

Brown

Stepping

motor

Machine rotation speed
setting variable resistor

Panel printed circuit board

Brown

Red

Green

Blue

Black

Purple

CN9

1 to 7

Summary of Contents for FLS-350N Series

Page 1: ...R ENGINEER S MANUAL 29311107 No 01 Electronic Handstitching Machine FLS 350N Series ...

Page 2: ...levant Instruction Manual and Parts List together with this Engineer s Manual when carrying out the maintenance service of this machine Regarding the motor for the sewing machine with automatic thread trimmer separately refer to the Instruction Manual for the motor and Engineer s Manual In addition for the control panel refer to the Instruction Manual for the control panel This manual gives the St...

Page 3: ...uide claw 16 1 Adjusting the needle and the needle guide claw 16 2 Adjusting the thread tension of the needle guide claw 16 3 Adjusting the timing of opening closing the tubular cam of the needle guide claw 18 6 Adjusting the thread path guide 18 7 Adjusting the thread haul lever 20 1 Cam timing 20 2 Adjusting the thread haul lever 20 8 Adjusting the brush cam 22 9 Adjusting the hook finger 22 1 A...

Page 4: ...lt of the feed stepping motor 44 25 Adjusting the threader needle during replacement 44 26 Adjusting the angle of the foot pedal and the foot pressure of the pedal FLS 350N only 46 27 Servomotor controller box connection diagram 46 28 Disassembling assembling the needle bar 48 29 Removing the snap ring when disassembling the needle bar 50 6 ELECTRICAL COMPONENTS 52 1 Printed circuit boards in the ...

Page 5: ...JIX Co KING FIT 60 Synthetic thread Sewing thread 1 200 mm or less Actuated by push button Stitch length is fixed at 1 to 2 mm for both top bottom stitches 1 needle 1 thread special stitching handstitching type Short long stitch Saddle stitch Top and bottom feed type Change of upper and lower stitch feed amount by a stepping motor Manual operation By a knee lifter lever 7 mm when the knee lifter l...

Page 6: ... the lamp will not light up since the lamp is not energized 4 Handle This handle can be operated manually 5 Main power switch Press the 1 side of the switch and the control circuit will be energized The indicator lamps on the control panel will light up and the motor that controls the feed mechanism and the sewing machine will be actuated to retrieve the origin Press the 0 side of the switch and t...

Page 7: ... guard It is a cover that protects eye from a broken needle that jumps out of position 6 AC servo motor 7 Control box 8 Needle threading lever It is used to thread the needle 9 Caster 0 Adjusting bolt 1 Thread stand packed in the accessory box 2 Thread guide This is a guide that works when drawing thread placed on the spool rest rod 3 Stitch ruler 2 Operation panel 1 Operation panel 4 Sewing speed...

Page 8: ... 4 ...

Page 9: ...n 1 In case of a a 1 In case of a a the lower stitch is larger than the upper stitch Add the compensation amount to the upper stitch length In this case press up the stitch length change switch and adjust the stitch length change variable resistor so that the lower stitch becomes the same as the upper stitch 2 In case of a a 2 In case of a a add the compensation amount to the lower stitch length a...

Page 10: ...the height of the lower needle bar support cylinder 5 4 2 Adjusting the timing of transferring the needle 5 4 3 Centering the needle bar 5 4 4 3 Adjusting the needle and the needle guide claws 5 5 1 Adjusting the timing of opening closing the tubular cam of the needle guide claw 5 5 3 Adjusting the thread tension of the needle guide claws 5 5 2 4 Adjusting the lower looper 5 20 Points to be adjust...

Page 11: ...r 5 9 Adjusting the hook finger to release the thread tension 5 10 7 Adjusting the left looper 5 16 Adjusting the right looper cam 5 17 Adjusting the right looper 5 18 8 Adjusting the brush cam 5 8 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 360 209 4 222 270 252 4 182 360 360 255 4 ...

Page 12: ...the home position adjusting the graduation 330 0 300 270 270 255 4 252 4 2 240 210 180 Handle Aluminum plate Upper dead point Lower stop section Upper stop section Home position Handle 1 Gear box frame Arrow mark Angle board Handle Main unit table FLS 350N FLS 350NA NB FLS 351NA FLS 350N FLS 350NA NB FLS 351NA ...

Page 13: ...nts The home position alignment is performed by determining the 2 position Adjustment procedure 1 Turn the handle and stop the needle bar when it starts coming down from the upper stop position At this time loosen the setscrews 6 pcs in the angle board 1 so that the arrow mark points to 2 After adjusting the position fix the angle board The upper stop position is slightly lower than the upper dead...

Page 14: ... V belt Angle board Gear box cover Left looper cam configuration Fixing holes Positioning hole ø8 Groove cam wheel Setscrew B Setscrew A Left looper cam ø8 C 4 ø9 125mm 120 mm F Standard Adjustment FLS 350N FLS 350NA NB FLS 351NA Setscrew D V belt Gear box cover C Guide metal fitting Cord F Angle board ...

Page 15: ...ce upward Refer the adjustment to item 5 2 Adjusting the home position When the positioning holes of the left looper cam and the groove cam wheel are faced exactly toward the right hand side the upper end section becomes 0 In case of FLS 350NA NB and FLS 351NA 1 Bring the left looper cam setscrew tap to the up and down position of the rotating shaft 2 Install the left looper cam as illustrated in ...

Page 16: ...ntric pin Bush Locknut Needle bar Surface of the throat plate Elevating boss Upper eccentric pin Crank slide block Support cylinder of the upper needle bar Gauge A 12 0 2 mm Lower needle bar Setscrew B Lower eccentric pin Arm Setscrew A Support cylinder of the lower needle bar Gauge Support cylinder of the upper needle bar Support sleeve B 23 2 0 2 mm 4 Adjusting the needle bar Standard Adjustment...

Page 17: ...d side and use the gauge with turned upside down Dimension B of the gauge is 23 mm Perform this adjustment after checking that 4 4 1 Adjusting the height of the support cylinder of the upper needle bar has been performed If the height shifts needle transferring cannot be properly made causing needle breakage If the closest distance shifts needle tranferring cannot be properly made causing needle b...

Page 18: ...le bar Locknut Adjustment nut Rubber washer Upper needle bar Needle Lower needle bar Rubber washer Locknut Adjustment nut Elevating boss Support cylinder Stop pin Retaining ring Engraved line Support sleeve Side view Pin Connection groove Front view A Standard Adjustment 1 1 ...

Page 19: ...le is securely caught Check that the needle does not move up or down from up to down from down to up after transferring the needle Check the catching of the needle when the material used becomes thick If the catching is not proper causing needle breakage To confirm check whether the threading needle smoothly enters the needle eyelet If the adjustment is not proper wobbling and irregular stitch len...

Page 20: ...tension of the needle guide claw 5 Adjusting the needle guide claw Setscrew A Needle guide claws Slide block Needle guide claws Needle a b b Slide case Slide block Needle guide claw 1 Needle guide claw 2 Slide block Slide case Setscrew A Lever Bracket P 1 2 Standard Adjustment ...

Page 21: ...he claws may come in contact with the needle bar So be careful Adjust the thread tension of needle guide claws 1 and 2 at the position where they grasp the thread reference 86 to 166 1 When the needle guide claws grasp the thread pull the thread in direction P from between the slide block and the needle guide claws At this time measure the thread tension using a spring balancer and adjust so that ...

Page 22: ...ad path guide Standard Adjustment Standard Adjustment Lower fixed point 0 5 to 0 8 mm Position to close the needle guide Needle guide Cam follower Setscrew B 4 pcs Tubular cam of the needle guide Support cylinder of the lower needle bar 0 3 to 1 0 mm Setscrew A Thread path guide B Within 0 5 mm Within 0 5 mm ...

Page 23: ...clearance is large The thread does not enter the thread path guide causing thread breakage If the clearance is small The thread path guide comes in contact with the support cylinder of the lower needle bar causing thread path guide breakage If the timing shifts the needle guide comes in contact with the needle bar or the needle guide does not catch the thread Loosen setscrew A and adjust so that t...

Page 24: ...1 Cam timing 2 Adjusting the thread haul lever 7 Adjusting the thread haul lever Thread haul lever Tubular cam A Tubular cam A Setscrew B Setscrew A Guide metal fitting Standard Adjustment Thread haul lever ...

Page 25: ...w A and adjust so that the difference in height between the top end of the thread haul lever and the top end of the guide metal fitting is set to 1 to 3 mm when the top end of the thread haul lever reaches its lowest end Make the thread approach inside the drum using the thread haul lever At this time if the thread comes off the drum decrease the difference in height between the thread haul lever ...

Page 26: ...rush cam Brush Setscrew A Standard Adjustment Standard Adjustment 9 Adjusting the hook finger 1 Adjusting the movement amount of the hook finger Hook finger Needle center Hook finger Guide plate Fulcrum shaft A B 3 to 6 mm ...

Page 27: ... the guide plate so that a 3 to 6 mm clearance is obtained from the center of the needle to the top end of the hook finger when the hook finger comes nearest to the operator in its stroke Adjust so that the top end of the hook finger is aligned with the tip of the needle when the hook finger returns to its home position Angle of the timing when the needle is lowered is reference 88 Keep the rotati...

Page 28: ... spring 3 Adjusting the clearance between the hook finger and the needle Hook finger 0 1 to 1 0 mm Eccentric pin Needle Setscrew A Lever Tension spring Needle Hook finger Eccentric pin Tension spring Setscrew B Rotating shaft Gear P Standard Adjustment ...

Page 29: ...dle when the hook finger comes nearest to the needle Then tighten setscrew A Simultaneously adjust the item 9 1 and 2 1 Loosen setscrew B and adjust the tension spring so that the tension in direction P is 10 to 30g or less when the hook finger is located farthest from the operator side Adjustment Procedures Results of Improper Adjustment ...

Page 30: ...ook finger to release the thread tension Thread tension is maximized Setscrew Late Early Rotation direction Thread tension is reduced Late Needle Setscrew A Mark Mark Rotating shaft Eccentric pin Hook finger 11 Adjusting the eccentric amount of the eccentric pin A ...

Page 31: ...ion Do not operate the machine with the mark on the rotating shaft set out of the range between the two marks on the eccentric pin If the timing to return the hook finger is excessively retarded isolated idling loops may be formed If the timing of the hook finger is retarded thread tension is reduced but isolated idling loops or the like are likely to be formed 1 If the total of upper lower stitch...

Page 32: ... Adjusting the height of the lower feed dog and the throat plate Lever Shaft Eccentric boss setscrew A Lifting cam setscrew B Eccentric boss Setscrew D Lower feed dog Nut Joint Lifting cam Eccentric boss Setscrew C 180 0 Throat plate Lower feed dog Parallel 0 5 to 0 8 mm Standard Adjustment ...

Page 33: ...per feed is not synchronized with the movement it will result in stitch slippage 1 Loosen the nut of the joint in the previous item 1 and adjust so that the lower feed dog protrudes from the throat plate by 0 5 to 0 8 mm 2 Loosen setscrew C and adjust so that the lower feed dog is parallel to the throat plate then tighten setscrew C If the lower feed dog is positioned lower than the specified amou...

Page 34: ...crew A Lever Upper feed dog Lower feed dog 14 Adjusting the presser foot 2 6 to 3 0 mm Throat plate Center of needle 0 6 mm Side view Lower feed dog Presser foot Presser foot holder Setscrew E Take up plate Setscrew D Presser foot holder Setscrew A Center of needle hole Presser foot Throat plate 8 5 mm 0 ...

Page 35: ...e throat plate loosen four setscrews A in the take up plate first Then position the throat plate so that the needle enters the center of the needle hole in the throat plate Then tighten setscrews A in the take up plate 2 Loosen setscrew E in the presser foot holder and adjust so that the needle groove in the throat plate is aligned with the slot in the presser foot After the adjustment tighten set...

Page 36: ...eed eccentric shaft 16 Adjusting the left looper Throat plate Eccentric shaft pin Setscrew A Setscrew B Eccentric shaft Coupling Shaft Center of the left looper shaft Setscrew B Holder Setscrew A 5 to 6 mm Left looper Left looper box nut 3 to 4 mm 0 1 to 0 4 mm 120 1 mm ...

Page 37: ...o late When the feed completes feeding the material and the upper feed and lower feed dogs are moving away from each other the presser foot comes down together with the lower feed dog 1 Turn the handle until the left looper is brought to the forward end position toward you 250 to 255 2 Loosen setscrews B and adjust so that a distance of 5 to 6 mm is provided between the center of the needle and th...

Page 38: ...18 Adjusting the right looper Setscrew A Cam follower Right looper cam Lever 1 Adjusting the right looper pin Holder Bracket Pin 2 Nut 31 to 32 mm 1 to 3 mm Pin 1 Spring 1 Adjusting screw Nut Hexagon nut Right looper pin Collar 0 1 to 0 5 mm Setscrew A A 9 0 5 mm Actuating lever ...

Page 39: ...er and lower needle bars Upper feed link 2 Feed drive link A Ellipse gear Other gears Tubular roller cam 4 of the needle guide claw Tubular roller cam 5 of the thread haul lever Feed eccentric boss 6 Period Everyday Once a week Once a week Every six months Every six months Every six months Every six months 1 2 5 4 6 A 1 2 2 ...

Page 40: ...nt replace them if it breaks when disassembling the needle bar It is recommended to replace the snap ring earlier than the designated time for replacement If any gap is found when fitting the snap ring in the groove on the needle bar support cylinder or the snap ring is damaged has burrs or has worn out replace the snap ring with a new one If the top end of the needle holder pin becomes chipped re...

Page 41: ...he sewing machine locked Is the motor locked Is the motor connector 4 pin securely inserted Are the signals from the motor connector 4 pin correct Is an extraordinary signal inputted The signal as it repeats ON OFF at the high frequency Does the noise from outside enter an input signal Is the position detector connector securely inserted Are the signals from the detector correct UP DOWN signal int...

Page 42: ...s Replace the needle with a new one 1 Thread breakage 2 Needle breakage 3 Wobbling or waving stitches are made The stop spring has broken The tip of the needle holder pin is broken Dust thread waste has accumulated on the needle bar The hole in the needle guard pin is clogged with dust The rubber washer has broken The needle holder pin or stop spring cannot be installed in the predetermined positi...

Page 43: ...ength cannot be made 6 Loose stitches 7 Reverse stitching is invalid 8 Abnormal noise sounds The feed mechanism fails to feed the material Isolated idle loops are made on the right side of the material Isolated idle loops are made on the wrong side of the material Excessive seam tension Defective switch Damaged power cable The proximity sensor fails to work Check the position where makes the noise...

Page 44: ...y connected 2 Defective detector 3 The power is not turned ON 4 T h e p o w e r c a b l e h a s b e e n disconnected Fuse F1 has blown Fuse F2 has blown The power cable has been damaged The drum cover opens Faulty contact of the limit switch Fuse F3 has blown Check the wiring Replace fuse F1 Replace fuse F2 Replace the cable Close the drum cover Check the cable Replace the switch Replace fuse F3 C...

Page 45: ... When moving your foot away from the pedal the machine stops immediately without rotating until the home position is reached Faulty stepping motor driver Faulty signal output from the control printed circuit board Faulty proximity sensor Defective power cable The stepping motor driver cannot be actuated Faulty switch contact The belt between the main shaft and the intermediate shaft excessively sl...

Page 46: ...st approach section Distance 23 6 0 1mm 1 5 mm 209 4 330 252 4 255 4 270 2 6 mm Needle transfer 72 4 75 4 90 Thread haul S 2 6 mm 182 222 86 Thread grasp closing section 42 166 196 60 0 25 Right looper retreat section 235 255 265 2 1mm 295 72 Neutral section 100 180 Exreme forward end 190 250 Retreat 255 Stop near to the needle 280 345 20 80 Left end stop 110 170 Right end stop 210 270 Neutral 360...

Page 47: ...ite Black CN9 1 2 3 4 5 6 A A B B COM A COM B CN9 1 2 3 4 5 6 Black Green Yellow Red Blue White Feed amount determined Red Orange Yellow Black Black White Black Terminal board P 12V 201 Upper lower feed sensor 202 Feed timing sensor P 12 V N 203 Feed motor origin sensor 204 Reverse stitch origin sensor N 205 Reverse stitch switch N 301 302 Speed command 303 Brown Brown Black Black Brown Brown Blue...

Page 48: ...J 3 Machine rotation speed setting variable resistor Stitch changing variable resistor Stitch changing variable resistor Upper lower stitch length selecting switch CN6 VR SS1 Stitch length adjusting setting variable resistor Stitch length adjusting selecting switch AC100 V FG CW CCW Stepping motor driver A B A B COM A COM B CN9 PM1 Stepping motor TB2 P 201 N NS 1 Feed start P 202 N NS 2 Feed timin...

Page 49: ... 25206558 25207150 25207051 25206954 R2 T1 5 1 3 5 13 9 M1 10 2 4 6 14 4 R1 T Stepping motor driver CW CCW A B COM A COM B AC100 V FG A B 5 1 2 3 4 5 6 7 8 9 10 11 12 13 4 FG 1 2 25206855 CN9 25208356 1 F3 2 T1 F2 T2 R F1 R1 25207754 25207952 FG TB1 5 4 3 2 1 R T E R 2 T 2 R 1 T 1 1 25207358 2 25207457 To be the twist pair type wire 25210857 25210956 25206756 25206459 25206657 25208059 25208257 25...

Page 50: ...6 2 2 drilled hole depth 10 340 205 174 193 Center of needle 540 520 460 520 W W 106 5 R8 4 R 5 0 R 5 0 R 5 0 R 2 7 5 X X 2 3 5 drilled hole depth 10 R8 R 2 7 5 R50 88 8 266 2 226 2 88 8 52 5 90 315 195 490 540 620 580 1200 45 140 27 5 55 230 190 235 310 203 800 Top surface Melamine decorative board 15 Urban white painting bottom surface Y2 41 Urban white painting all around end grain Y2 21 5 0 5 ...

Page 51: ...this engineer s manual is subject to change for improvement of the commodity without notice 01 09 Printed in Japan E R INTERNATIONAL SALES H Q 8 2 1 KOKURYO CHO CHOFU SHI TOKYO 182 8655 JAPAN PHONE 81 3 3430 4001 to 4005 FAX 81 3 3430 4909 4914 4984 TELEX J22967 Copyright C 1997 2001 JUKI CORPORATION All rights reserved throughout the world ...

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