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JUKI MB-1800 series, Engineer'S Manual

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JUKI MB-1800 series Engineer'S Manual Download Page 19

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16

 

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(2) Disassembling the circuit board

1) Cover components

2) Circuit board components

Control box cover

Side cover

POWER circuit board

MAIN circuit board

POWER circuit board

Setscrew 

1

MAIN circuit board

Setscrew 

3

Circuit board installing plate

Collar

Setscrew 

3

Setscrew 

2

Procedures in disassembling and assembling

Summary of Contents for MB-1800 series

Page 1: ...R Dry head Type High speed Computer controlled Single Thread Chainstich Button Sewing Machine with Automatic Thread Trimmer and Knot tying Mechanism MB 1800 MB 1800A ENGINEER S MANUAL 29345105 No 00...

Page 2: ...l and operators at an apparel factory contains operating instructions in detail And this manual describes Standard Adjustment Adjustment Procedures Results of Improper Adjutment and other important in...

Page 3: ...ft 20 5 Disassembling the driving shaft 22 7 ADJUSTMENT OF THE SENSORS 26 1 Adjusting the starting sensor 26 2 Adjusting the presser lifter sensor 26 3 Adjusting the feed origin sensor 28 4 Adjusting...

Page 4: ...400 to 1 800 rpm with the up down key Adjustable in 100 rpm unit 11 Pattern selection function 1 to 99 patterns can be specified by selecting the pattern Nos 12 Memory back up In case of a power inter...

Page 5: ...2 2 NAME OF EACH COMPONENT 1 Name of the main unit Machine head Electrical components Operation panel Thread stand Button tray Power switch Starting pedal...

Page 6: ...witch This switch is used when changing the stitch shape 5 Forward switch This switch increases the set value or performs traveling forward when confirming the feed 6 Backward switch This switch decre...

Page 7: ...2 holed lengthwise 4 holed crossover stitch with 4 holed crossover stitch without 3 holed 3 holed 3 holed 3 holed 2 holed crosswise label attaching Wrapped around crosswize size 4 mm Wrapped around cr...

Page 8: ...are being inputted 2 Setting procedure of the memory switches There are the memory switches 1 to 8 Switch N0 is displayed in the display section A 3 and item selection LED 0 of the pattern No lights u...

Page 9: ...the needle bar is ascending 2 Clearance between the needle and looper The clearance is 0 05 to 0 1 mm when the looper s blade point coincides with the center of the needle 3 Clearance between the nee...

Page 10: ...n of the needle guide 1 so that the clearance between the needle guide 1 and needle should become 0 05 to 0 1 mm when the needle bar is at its lowest position Then tighten the screw 2 If the clearance...

Page 11: ...of the movement of the triangle 3 Lengthwise positioning of the yoke slide Position the yoke slide so that the blade point of the looper passes through the center of the thread triangle Use a 4 hole b...

Page 12: ...egins to travel too late thread breakage thread remaining baloon stitch and insufficient tightness of stitches will result On the contrary if it begins to move too early the needle will come in contac...

Page 13: ...on of the pressure adjusting nut to 4 to 5 mm 4 to 5 mm 5 ADJUSTMENT OF THE THREAD TRIMMING MECHANISM 1 The mechanism and the name of each component of the thread trimmer Throat plate Presser lifter s...

Page 14: ...to the lower side 2 Make adjustment by turning the pressure adjusting nut 1 Increasing the lifting amount of the button clamp will increase the length of the remaining thread Especially in case of MB...

Page 15: ...he throat plate should be 12 to 13 mm when the button clamp is at its highest position 3 Adjusting the height of the thread separating claw of the moving knife Make adjustment so that the clearance be...

Page 16: ...separate the thread on the needle from that on a fabric As a result thread may not be trimmed or the both threads are trimmed together causing thread slippage from the needle in the subsequent stitch...

Page 17: ...ring Needle bar upper bushing Needle bar clamp Needle bar lower bushing Yoke slide Triangle loop positioning finger cam Loop positioning finger cam Needle bearing Thrust bearing Rocking rod fulcrum sh...

Page 18: ...15 Cautions in disassembling Cautions in assembling...

Page 19: ...Circuit board components Control box cover Side cover POWER circuit board MAIN circuit board POWER circuit board Setscrew 1 MAIN circuit board Setscrew 3 Circuit board installing plate Collar Setscre...

Page 20: ...oard installing plate by hand and draw it out in the direction of the arrow and you can remove the circuit board in the state that it is connected to the circuit board installing plate 4 Remove 8 sets...

Page 21: ...achine arm and bed 1 Bed components 2 Arm components Rubber base Crank rod Stud Base cover Rubber base Starting spring Throat plate Starting lever spring Setscrew Bed connecting bolt Procedures in dis...

Page 22: ...sembling 5 Remove the starting lever spring 6 Remove the arm bed connecting bolts and remove the machine arm while rocking and lifting it Finally remove the knock pins Assembling 1 Hold the machine ar...

Page 23: ...al Loop positioning finger cam setscrew Needle bearing Thrust collar Looper installing shaft Triangle loop positioning finger cam Looper shaft Thrust collar Thrust bearing Needle bearing Thrust bearin...

Page 24: ...like from the grease hole on the surface of the machine bed after setting up 2 Enter two thrust collars and the screw gear on the looper shaft 3 Fit the thrust collars at the position where the dimen...

Page 25: ...and bushing of screw gear Assembling 1 Screw gear 4 Rotor 5 Stator 8 Bushing Motor cover Ball bearing Encoder Driving shaft bushing left Ball bearing Servo motor Stator setscrew Bushing setscrew Scre...

Page 26: ...o be careful 8 Hold the rotor so that it is wrapped in a piece of clean cloth loosen the setscrew and draw it out from the driving shaft Wrap the rotor which has been drawn out in a piece of cloth Not...

Page 27: ...the servo motor 15 Stator setscrew 16 Cord outlet 17 Operation panel 18 Panel display 20 Fixing stator 21 Encoder 23 Encoder setscrew 24 Encoder 0 display Stator setscrew Cord outlet Encoder installi...

Page 28: ...te turn again the hand pulley and adjust so that the needle bar is brought to its lowest position Fix the stator in this state The rotor and the stator have come to the most proper position since they...

Page 29: ...Presser lifter lowering sensor LD1 Presser lifter lifting sensor LD4 Moving knife Setscrew Presser lifter sensor Thrust collar Starting lever Sensor slit Starting sensor Sensor slit Starting sensor p...

Page 30: ...r lifter sensor 1 Remove the top cover and the control box cover 2 Tilt the sewing machine When the machine is put in this state the sewing machine does not rotate if the starting pedal is depressed b...

Page 31: ...are in the same direction 4 Adjusting the presser lifter stopper Sensor slit Setscrew Origin sensor Origin sensor installing plate setscrew Origin sensor installing plate setscrew Origin sensor left L...

Page 32: ...r as observed from the front of the sewing machine at the position where LD2 on the MAIN circuit board goes out then lights up 30 to 40 kgf 6 Fix the right hand sensor as observed from the front of th...

Page 33: ...elow and the memory switch No 1 is displayed The mode becomes the setting mode of the service level At this time all of the stitch shape selection LED flash on and off and only the pattern No LED of t...

Page 34: ...memory switch No 8 wiper function is selected Wiper solenoid ON hold time setting When memory switch No 8 wiper function is selected Speed of 1st stitch at the sewing start can be limited Speed of 2nd...

Page 35: ...position setting 2 Thread trimming operation setting 1 For BR Thread trimming operation setting 2 For BR Feed pulse delivery timing setting Thread trimming position function selection Thread trimming...

Page 36: ...origin sensor is in the input state of ON 4 When performing checking of other function No press down Item selection switch again and the display becomes the display state of step 1 In this state sele...

Page 37: ...ON OFF CN25 22 Not used CN25 24 SW1 1 DIP SW ON OFF SW1 3 DIP SW ON OFF SW1 5 DIP SW ON OFF SW1 7 DIP SW ON OFF Right hand side of display section 1st digit Origin detection sensor Right stepping moto...

Page 38: ...witch turn ON the power and the display section becomes as shown below 2 In this state press Reset switch and the display section becomes as shown below Then data deletion operation starts 3 When the...

Page 39: ...he following parts Crank rod hinge screw Rocking rod fulcrum shaft Needle bar upper bushing Needle bar clamp Needle bar lower bushing Yoke slide Triangle cam Loop positioning finger cam Needle bearing...

Page 40: ...motor Defective control circuit board or defective program ROM Trouble of origin sensor 1 dislocation of sensor or trouble of load on stepping motor 1 left side of operator Trouble of origin sensor 2...

Page 41: ...he cover in the rear of the sewing machine and replace from 200V to 100V the connector of connector No CN32 blue 2 pin on the right side PWR circuit board as observed from the front side See the figur...

Page 42: ...arating claw of the moving knife Refer to the item 5 3 Adjusting the height of the thread separating claw of the moving knife Improper position of the moving knife 3 The trimmed thread on the wrong si...

Page 43: ...ost No 2 fails to release the thread at correct timing Make the thread releasing timing slightly earlier The thread tension post No 2 does not give sufficient tension Increase the tension of the threa...

Page 44: ...41 15 CIRCUIT BOARD DIAGRAM 1 MAIN circuit board...

Page 45: ...42 2 PWR circuit board 3 PANEL circuit board...

Page 46: ...ature sensor cord asm 1 MAIN pcb A asm 1 Presser sensor cord asm 0 Starting cord asm CN27 6P CN28 9P CN23 3P CN22 3P CN15 2P CN14 2P CN12 2P CN13 2P CN20 3P CN21 3P CN30 6P 6 Thread tension relay cord...

Page 47: ...relay cord asm Input change over cord asm Control box power cord asm Feed origin cord asm Starting cord asm Presser sensor cord asm Feed 1 stepping motor Feed 2 stepping motor Servo motor Servo encode...

Page 48: ...rd asm FG1 FG2 AC IN AC IN 1 1 2 2 1 1 2 2 White White CN32 100V 100V RTN CN32 200V NC NC PWR pcb asm MAIN pcb A asm 1 1 2 2 3 3 FAN asm N C 1 2 3 4 5 6 N C N C N C N C N C CN34 15V 1 15V 1RET 15V 2 1...

Page 49: ...LACK 1 2 CN29 TEMP DETECT GND WHITE BLACK RED WHITE BLACK GREEN YELLOW BROWN 3 2 1 CN52 3 2 1 CN52 3 2 1 CN53 3 2 1 CN53 3 2 1 CN54 3 2 1 CN54 3 2 1 CN55 3 2 1 CN55 3 2 1 CN56 3 2 1 CN56 3 2 1 CN57 3...

Page 50: ...24V L1 A L1 B 24V L1 B 1 5 3 2 6 4 CN16 YELLOW ORANGE BLUE RED WHITE BLACK L2 A 24V L2 A L2 B 24V L2 B 1 5 3 2 6 4 YELLOW ORANGE BLUE RED WHITE BLACK CN17 FEED 1 STEPPING MOTOR FEED 2 STEPPING MOTOR S...

Page 51: ...WHITE WHITE BLACK GRAY BLACK GREEN GREEN BLACK BLUE BLUE BLACK YELLOW YELLOW BLACK RED BLACK CN19 SERVO ENCODER TS5207N530 24V PRESSER LIFTER 24V KNOT TYING 24V WIPER 24V THREAD TENSION 1 2 1 2 1 2 1...

Page 52: ...hole 3 8 drilled hole JUKI logotype 2 drilled hole depth 10 bottom surface Installing position of drawer 2 2 drilled hole depth 10 bottom surface Main switch installing position 40 drilled hole 4 2 dr...

Page 53: ...his engineer s manual is subject to change for improvement of the commodity without notice 00 04 Printed in Japan E R INTERNATIONAL SALES DIVISION 8 2 1 KOKURYO CHO CHOFU SHI TOKYO 182 8655 JAPAN PHON...

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