Brother 888X Series Service Manual Download Page 8

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Outline of Mechanism

Outline of Mechanism

Driveline

(A) Up and down movement of needle bar, movement of thread take-up lever and

zigzag movement of needle bar mechanism

Pulley

Upper shaft

Z finger frame

Pattern cam

Main motor

Motor belt

Needle

Needle bar
supporter

Needle bar crank

Needle bar

Thread take-up

counter weight

Zigzag connecting rod

Needle bar block

Needle bar block shaft

Needle bar crank rod

Needle bar

crank rod

Needle bar

block shaft

Needle bar

supporter

Needle bar crank

Z finger frame

Thread take-up

counter weight

Upper shaft

Pulley

Needle bar block

Needle bar

Needle

Timing pulley

Pattern cam

Motor belt

Main motor

Selecting cam

Zigzag

connecting rod

Upper shaft gear

Selecting cam

Upper shaft gear

Timing pulley

Summary of Contents for 888X Series

Page 2: ......

Page 3: ...FB1757T SM1704 X10 HQ22 ModerN14 Nov 2016 SM1738D Dec 2016 JX1714 LX3817 artwork31SE L17s L14s e15 e20 LX500 LX700 LS3125S LS14s Jan 2017 Oct 2016 J14s KD144s J17s KE14s AZ14 AZ17 X14s X17s Changed 2 5 2 9 2 11 2 20 2 25 3 1 Added 3 21 to 25 Mar 2016 VX1445 SM1400 VX1445 ArtCity190 JS27 BX3000 CX5 JS2135 M14 JX3135F VX3250F G20 ...

Page 4: ...lley assy motor belt 2 13 Bobbin winding and Needle threading mechanism 2 14 Removal of Bobbin winding 2 15 Removal of Thread tension assy 2 15 Pattern selecting mechanism 2 16 Removal of Pattern select unit assy 2 17 Removal of Feed connecting lever assy 2 19 Upper shaft Needle presser module 2 20 Removal of Tension pulley assy timing belt 2 21 Removal of Upper shaft assy 2 22 Removal of Needle p...

Page 5: ...eft right 3 17 Feed dog height 3 18 Upper thread tension 3 19 Left and right stitch of buttonhole stitch length 3 21 Needle threader 3 24 Bobbin winder 3 25 Lower thread tension 3 26 4 Failure Investigation for Electronic Parts 4 1 Sewing lamp does not light 4 2 Main motor does not turn or Rotation speed is slow 4 3 5 Special Instructions of Wiring 5 1 Motor 3P supply assy 5 2 LED lead wire 5 3 ...

Page 6: ...1 1 1 Main mechanisms 1 2 Driveline 1 3 Positions of electronic components 1 5 Control system block diagram 1 6 Outline of Mechanism ...

Page 7: ...Main mechanisms Bobbin winder Mechanism Front Side View Back Side View Horizontal feed Mechanism Pattern selecting Mechanism Lower shaft Mechanism Upper shaft Mechanism Feed Rotary hook Mechanism Zigzag Mechanism Thread guide Mechanism Needle bar Presser foot Mechanism ...

Page 8: ... supporter Needle bar crank Needle bar Thread take up counter weight Zigzag connecting rod Needle bar block Needle bar block shaft Needle bar crank rod Needle bar crank rod Needle bar block shaft Needle bar supporter Needle bar crank Z finger frame Thread take up counter weight Upper shaft Pulley Needle bar block Needle bar Needle Timing pulley Pattern cam Motor belt Main motor Selecting cam Zigza...

Page 9: ... Lower shaft Feed dial Pattern selecting dial Selecting cam Lower shaft gear Feed cam Feed arm B Timing pulley Upper shaft pulley Pulley Timing pulley D Lower shaft Lower shaft gear Main motor Timing belt Motor belt Feed dial Feed cam Feed connecting lever Pattern selecting dial Selecting cam Feed regulator plate A B Upper shaft Feed arm B Feed arm A Outer rotary hook assy Feed stand Feed dog Oute...

Page 10: ...1 5 Outline of Mechanism Outline of Mechanism Outline of Mechanism Positions of electronic components Main motor 3pin socket Power supply PCB Sewing lamp LED Power SW ...

Page 11: ...anism Outline of Mechanism Outline of Mechanism Control system block diagram SEWING MACHINE In the 3pin socket Main motor Foot controller plug 3pin AC Foot controller 3pin socket Power SW Power supply PCB Sewing lamp LED ...

Page 12: ...fix by a unity of the module use this chapter Basic of Disassembly and Assembling Note Preparation 2 2 Main frame and Covers 2 3 Main motor unit 2 9 Bobbin winding and Needle threading mechanism 2 14 Pattern selecting mechanism 2 16 Upper shaft Needle presser module 2 20 Feed unit 2 25 ...

Page 13: ...asic of Disassembly Basic of Disassembly 1 Disconnecting cables Removing accessories Foot controller socket Needle Presser foot Accessory table Slide plate Bobbin Foot controller socket Accessory table Bobbin Slide plate Presser foot Needle ...

Page 14: ...Basic of Disassembly Basic of Disassembly 2 3 Main frame and Covers Basic of Disassembly Main frame and Covers location diagram ...

Page 15: ...ate assy 1 Remove the screw taptite cup P M4x20 from the rear cover side Open the face plate assy pull out the pin of the face plate assy from the hole of front cover assy and remove the face plate Taptite Cup P M4X20 Screw taptite cup P M4x20 Face plate assy Hole of front cover assy Pin of the face plate assy ...

Page 16: ...rn selecting dial from the shaft of pattern select unit assy 2 Remove the retaining ring E5 to pull out the feed dial from the shaft of pattern select unit assy for the models equipped with these parts only for the models equipped with these parts only Pattern selecting dial Shaft of pattern select unit assy Retaining ring E5 Feed dial Pattern selecting dial ...

Page 17: ...3x16 from the rear cover side Remove the two screws screw pan S P washer M4x10 from the bottom side 2 Release the each hook of front cover assy from the each hook tray of rear cover assy to remove the front cover assy Taptite Pan P S P W M3X12 Taptite Cup P M4X20 Taptite Bind P M3X16 Screw Pan S P washer M4X10 Taptite pan S P W 3x12 Taptite cup P M4x20 Washer plain M3 5 Hook Hook Hook tray Hook tr...

Page 18: ...presser foot lifter 2 Remove the two screws screw pan S P washer M4x10 from the bottom side amd the three screws taptite cup P M4x20 from the arm bed side Remove the rear cover assy from the arm bed Screw Pan S P washer M4X10 Taptite Cup P M4X20 Taptite cup P M4x20 Screw pan S P washer M4x10 Taptite cup P M4x20 Taptite cup P M4x20 Presser foot lifter Rear cover assy ...

Page 19: ...pan P S P W 3x14 to remove the bobbin presser 4 Remove the screw taptite cup P M4x20 to remove the thread guide assy Assenbling Note Place the bobbin presser with the smaller end facing the rear Taptite Pan P S P W M3X14 Taptite Cup P M4X20 Taptite pan P S P W 3x14 Bobbin presser Thread guide assy Taptite cup P M4x20 ...

Page 20: ...Basic of Disassembly 2 9 Main motor unit Basic of Disassembly Basic of Disassembly Main motor unit location diagram ...

Page 21: ...amps from the lead wire of LED lamp assy 2 Disconnect the connector of LED lamp assy from the PCB of motor 3P supply assy 3 Remove the screw screw pan S P washer M4x8 to remove the LED lamp assy from the base holder assy Taptite Bind S M4X10 Taptite bind S M4x10 Motor 3P supply assy Arm bed PCB Connector of LED lamp assy LED lamp assy Cord clamp Screw Pan S P washer M4X8 Screw pan S P washer M4x8 ...

Page 22: ... the timing belt from the T pulley and motor T pulley 2 Remove the screw screw pan S P washer M4x12 to remove the motor supporter for the models equipped with these parts only for the models equipped with these parts only Screw Pan S P washer M4X12 Timing belt T pulley Motor T pulley Motor supporter Screw pan S P washer M4x12 ...

Page 23: ...r M4x12 to remove the motor assy of motor 3P supply assy from the arm bed 4 Remove the two screws taptite pan B S P W 4x21 to remove the 3P socket unit of motor 3P supply assy from the arm bed Taptite Pan B S P W M4X21 Screw Pan S P washer M4X12 Taptite pan B S P W 4x21 Screw pan S P washer M4x12 Motor assy Motor 3P supply assy ...

Page 24: ...Disassembly Basic of Disassembly 3 Removal of Tension pulley assy motor belt 1 Remove the two screws screw pan S P washer M4x12 to remove the tension pulley assy from the arm bed Screw Pan S P washer M4X12 Tension pulley assy Screw pan S P washer M4x12 ...

Page 25: ...Basic of Disassembly 2 14 Bobbin winding and Needle threading mechanism Basic of Disassembly Basic of Disassembly Bobbin winding and Needle threading mechanism location diagram ...

Page 26: ...ension assy 1 Remove the two screws screw pan S P washer M4x12 to remove the thread tension assy 2 Remove the screw taptite cup S 4x16 to remove the upper tension control lever from the mounting position of the arm bed Screw Pan S P washer M4X12 Bobbin winder assy Screw pan S P washer M4x12 Screw Pan S P washer M4X12 Taptite Cup S 4X16 Taptite cup S 4x16 Screw pan S P washer M4x12 Thread tension a...

Page 27: ...Basic of Disassembly 2 16 Pattern selecting mechanism Basic of Disassembly Basic of Disassembly Pattern selecting mechanism location diagram ...

Page 28: ...etaining ring E4 to remove the zigzag connecting rod from the needle unit assy and the pattern select unit assy 3 Remove the spring extension C XE9262 from the feed connecting lever assy and the pattern select unit assy Screw Pan S P washer M3X8 Spring extension C XE9262 Screw pan S P washer M3x8 Retaining ring E4 Zigzag connecting rod Pattern select unit assy Needle unit assy Reverse sewing butto...

Page 29: ...from the arm bed Assenbling Note When attaching the pattern select unit assy insert the boss of feed connecting lever assy into the hole of pattern select unit assy When attaching the pattern select unit assy align the worm gear and the marked position on the pattern cam Taptite Bind S M4X10 Taptite bind S M4x10 Pattern select unit assy Pattern select unit assy 90 degrees Feed connecting lever ass...

Page 30: ...assy 1 Remove the two screws screw bind M4x8 to remove the feed connecting lever assy from the arm bed Assenbling Note When attaching the feed connecting lever assy insert the boss of feed arm B assy into the groove of feed connecting lever assy Screw Bind M4X8 Feed connecting lever assy Groove Screw bind M4x8 Boss Feed arm B assy ...

Page 31: ...Basic of Disassembly 2 20 Upper shaft Needle presser module Basic of Disassembly Basic of Disassembly Upper shaft Needle presser module location diagram ...

Page 32: ...sy timing belt 1 Remove the screw screw pan S P washer M4x12 and the nut 2 M4 to remove the tension pulley assy from the arm bed 2 Remove the timing belt from the lower shaft assy and the upper shaft assy Screw Pan S P washer M4X12 Screw pan S P washer M4x12 Nut 2 M4 Upper shaft assy Lower shaft assy Timing belt Tension pulley assy ...

Page 33: ...e bind S M4x10 to remove the two bushing pressers from the arm bed Remove the two lower shaft bushings of upper shaft assy from the two mounting positions of arm bed and slide the upper shaft assy in the direction of the arrow to remove the thread take up counter weight of upper shaft assy from the shaft of thread take up lever Set Screw Socket FT M5X5 Taptite Bind S M4X10 Set screw socket FT M5x5...

Page 34: ...Disassembly Basic of Disassembly 3 Removal of Needle presser module 1 Remove the screw screw pan S P washer M4x10 from the arm bed and remove the screw cup screw M3x20 from the arm bed Screw Pan S P washer M4X10 Cup screw M3X20 Screw pan S P washer M4x10 Cup screw M3x20 ...

Page 35: ...per shaft Needle presser module Basic of Disassembly Basic of Disassembly 2 Remove the two screws taptite cup S 4x16 to remove the needle presser module from the arm bed Taptite Cup S 4X16 Needle presser module Taptite cup S 4x16 ...

Page 36: ...Basic of Disassembly 2 25 Feed unit Basic of Disassembly Basic of Disassembly Feed unit location diagram ...

Page 37: ...1 Remove the screw taptite bind S M4x10 to remove the bushing presser from the arm bed 2 Remove the three screws screw pan S P washer M4x10 to remove the feed unit from the arm bed Taptite Bind S M4X10 Screw Pan S P washer M4X10 Taptite bind S M4x10 Screw pan S P washer M4x10 Bushing presser Feed unit ...

Page 38: ... 3 8 Needle interference left right 3 9 Needle bar rising 3 10 Needle bar height 3 12 Needle clearance 3 13 Presser bar height 3 14 Left straight stitch needle drop and zigzag stitch maximum left needle drop position 3 15 Feed dog position front back and left right 3 17 Feed dog height 3 18 Upper thread tension 3 19 Left and right stitch of buttonhole stitch length 3 21 Needle threader 3 24 Bobbin...

Page 39: ...Inspection Needle point damage 1 Put needle on a level block and check a needle is not bent 2 Slide a needle on your finger and check if moves smoothly no damage on needle point The gap with the block should be even Level block ...

Page 40: ...ove the face plate assy the pattern selecting dial and the feed dial and remove the front cover assy and the rear cover assy 3 Loosen the screw of the tension pulley assy 4 Move the tension pulley assy back and forth to adjust the tension of the timing belt 5 Tighten the screw of the tension pulley assy to secure the tension pulley assy to the arm bed XC2277001 Push pull gauge 5N Screw Pan S P was...

Page 41: ...tern selecting dial and the feed dial and remove the front cover assy and the rear cover assy 3 Check the location of the groove with spring hooked on 4 Loosen the two screws of the tension pulley holder B assy 5 Move the motor tension pulley assy up and down to adjust the clearance between the motor tension pulley assy and the emboss of tension pulley holder B assy 6 Tighten the two screws of the...

Page 42: ...rotrusion A of the inner rotary hook assy to the spring plate and then push the inner rotary hook assy to the needle side from front to rear 3 Loosen the screw of the inner rotary hook plate assy 4 Move the inner rotary hook plate assy to front back and adjust the overlap between the spring plate and the protrusion A of the inner rotary hook assy 5 Tighten the screw of the inner rotary hook plate ...

Page 43: ... from the rear cover hole to turn the screw and adjust the position of the presser foot hole and the needle plate hole in the front back direction Key point Loosen the screw turn to the direction of A Move the needle to the front side A Tighten the screw turn to the direction of B Move the needle to the rear side B Presser foot lifter Presser foot Screw Pan S P washer M4X10 Rear cover Screwdriver ...

Page 44: ...rmation 1 When the pulley is turned by hand from the rear to the front check that the needle flow from left to right is normal And check that the upper shaft rotation is not too heavy Key point If you find any error in needle swing timing reattach the upper shaft to engage markings on the upper shaft gear and the pattern cam Refer to 2 18 Starting position of lateral motion Stopping position of la...

Page 45: ...nd until the needle point comes to the needle plate surface Needle bar is left side 8 Loosen the screw of the zigzag adjusting nut 9 Adjust the left right needle drop position so that the same to the center of the needle hole by turning the zigzag adjusting nut Key point Adjust it within the range where the large side of the eccentric amount of the zigzag adjusting nut is lower side 10 Tighten the...

Page 46: ...zigzag stitch is the topmost position 5 Loosen the screw of the needle bar supporter guide 6 Adjust the left right needle drop position so that the same to the center of the needle hole by moving the knob of the needle bar supporter guide back and forth 7 Tighten the screw of the needle bar supporter guide to secure the needle bar supporter guide to the base holder Pattern selecting dial Screw 3X1...

Page 47: ...e the front cover assy and the rear cover assy 3 Remove the needle plate assy the presser foot and the inner rotary hook assy 4 Attach the size 90 14 needle 5 Attach the stitch length dial and the pattern selecting dial 6 Turn the pattern selecting dial until the left needle position straight stitch is the topmost position 7 Loosen the two screws of the timing pulley D 8 Raise the needle bar up 3 ...

Page 48: ... front when the right edge of the needle is coincided with the outer rotary hook point 10 Tighten the two screws of the timing pulley D to secure the timing pulley D to the lower shaft assy Confirmation When the needle is lowered to the lowest point by turning the pulley by hand check that the feed dog is lowered Set Screw Socket FT M5X5 D cut Outer rotary hook assy Right edge of needle and tip co...

Page 49: ... Attach the pattern selecting dial 6 Turn the pattern selecting dial until the left needle position straight stitch is the topmost position 7 Match up the right edge of the needle with the outer rotary hook point by turning the pulley by hand from the rear to the front 8 Loosen the screw of the needle bar block 9 Move the needle bar up and down and adjust the gap between the top of needle eye and ...

Page 50: ...attern selecting dial 6 Turn the pattern selecting dial until the left needle position straight stitch is the topmost position 7 Turn the pulley by hand until the outer rotary hook point aligns with the back side of the needle 8 Adjust the clearance between the scarf of the needle and the outer rotary hook point by turning the needle bar supporter presser by hand Key point Turn the needle bar supp...

Page 51: ... foot lifter to raise the presser foot J 5 Loosen the screw of the presser bar clamp 6 Move the presser bar presser foot up and down and adjust the clearance between the bottom surface of the presser foot and the surface of the needle plate Key point When measuring the height of the presser foot J perform in the state that lower the feed dog than the surface of the needle plate 7 Tighten the screw...

Page 52: ...t cover assy and the rear cover assy 3 Attach the size 90 14 needle 4 Attach the pattern selecting dial 5 Turn the pattern selecting dial until the left needle position straight stitch is the topmost position 6 Turn the pulley by hand and move the needle bar to its leftmost position 7 Lay a paper on the needle plate and lower the presser foot lifter to lower the presser foot And make a pinhole wit...

Page 53: ...art of the plate and move the plate by turning a flat screwdriver and move the needle point left and right And adjust them so that the pinhole on paper matches up with the needle point Key point Turn a flat screwdriver to the direction a Move the needle point to right side Turn a flat screwdriver to the direction b Move the needle point to left side 12 Tighten the screw of the pattern select unit ...

Page 54: ... of pattern selecting dial and 4 of stitch length dial are is the topmost position 3 Turn the pulley by hand and move the feed dog to the front position 4 Remove the two screws of the needle plate assy and remove the needle plate assy 5 Loosen the two screws of the feed dog Set the needle plate assy temporarily and adjust the position of the feed dog 6 Tighten the two screws of the feed dog to sec...

Page 55: ... move the feed dog to its highest position 4 Insert the hex wrench into the hole of the needle plate and adjust the feed dog height from the surface of the needle plate by turning the vertical adjuster screw Key point Loosen the vertical adjuster screw turn to the direction of a The feed dog is lowered Tighten the vertical adjuster screw turn to the direction of b The feed dog is raised Hex wrench...

Page 56: ... Raise the presser foot lifter 5 Pass the schappe spun thread 60 through the tension disc and lower the presser foot lifter Close the tension disc 6 Pull the thread up slowly with the tension gauge and measure the thread tension 7 Adjust the thread tension by turning the gear of tension control stud by hand Key point Turn the gear to the direction of A The thread tension is smaller Turn the gear t...

Page 57: ... gear of tension control stud 9 Tighten the screw while holding the tension control knob 10 Attach the thread tension label to the tension control knob Key point Thread tension label should be attached by matching its slit to the marked position on the tension control knob Gear of tension control stud Tension control knob Groove Taptite Bind B M3X10 Screw Tension control knob Screwdriver Thread te...

Page 58: ...left reverse right forward stitches should be 35 to 50 per 20 mm The stitch difference should be within 10 Adjustment 1 Attach the size 90 14 needle 2 Set the BH foot 3 Attach the foot controller and turn on the power 4 Execute the bar tack sewing 20 mm or more to the double broadcloth with a schappe spun thread 60 and check the number of stitches of the left reverse stitch and right forward stitc...

Page 59: ...stitches should be 35 to 50 per 20 mm Key point Turn the feed adjusting screw to the direction A Right forward stitch length is longer The number of stitches decreases Fig 1 A Turn the feed adjusting screw to the direction B Right forward stitch length is shorter The number of stitches increases Fig 1 B 8 Tighten the nut 4 of the feed adjusting screw on the feed regulator plate A B to secure the f...

Page 60: ...The number of left reverse stitches should be 35 to 50 per 20 mm And stitch difference should be within 10 Key point Turn the BH adjusting dial to the direction A Left reverse stitch length is longer The number of stitches decreases Fig 2 A Turn the BH adjusting dial to the direction B Left reverse stitch length is shorter The number of stitches increases Fig 2 B BH adjusting dial NG A B NG OK b b...

Page 61: ...al and remove the front cover and the rear cover 3 Attach the size 90 14 needle 4 Turn the pulley by hand and move the needle bar to its highest position 5 Loosen the screw of the needle thread lever 6 Move the needle thread lever up and down to adjust the clearance between the upside of the hook and the top of the needle eye 7 Tighten the screw of the needle thread lever to secure the needle thre...

Page 62: ...hat the thread is wound parallel to the bobbin Key point When uneven bobbin winding is the upper side move the thread guide assy downward Fig 1 a When uneven bobbin winding is the lower side move the thread guide assy upward Fig 1 b 5 Tighten the screw of the thread guide assy to secure the thread guide assy 6 Loosen the screw of the bobbin presser 7 Turn the bobbin presser left and right to adjus...

Page 63: ...n plate Key point Pass the thread through into the back of the groove of the thread tension plate 4 Pull the thread slowly from the inner rotary hook assy with the tension gauge and measure the thread tension 5 Adjust the thread tension by turning the tension adjusting screw of the inner rotary hook assy Key point The tension adjusting screw is secured with the thread locker 6 Secure the tension a...

Page 64: ...4 4 1 Sewing lamp does not light 4 2 Main motor does not turn or Rotation speed is slow 4 3 Failure Investigation for Electronic Parts ...

Page 65: ...er plug from the socket of the machine is the voltage between pins A of the plug 108 to 132V AC for 120V AC countries 1 Y N N Connect it properly Is the LED lamp assy connector connected to the power supply PCB CN2 correctly Y Refer to Fig 1 Refer to Fig 2 Fig 2 When disconnect the LED lamp assy connector from the power supply PCB CN2 is the voltage between pins 1 and 2 at CN2 10 to 12V DC Refer t...

Page 66: ... the socket of the machine and turn on the power switch is the resistance between pins A of the socket 60 to 80Ω for 120V AC countries 1 Y Y Refer to Fig 1 Main motor does not turn when pressing foot controller or Rotation speed is slow N Y Does the pulley turn smoothly Is the sewing lamp turned on Refer to 5 2 Sewing lamp does not light Reassemble the upper shaft assy Replace the motor 3P supply ...

Page 67: ...5 1 5 Motor 3P supply assy 5 2 LED lead wire 5 3 Special Instructions of Wiring ...

Page 68: ...supply assy 1 Attachment of motor Attach the motor so that the outlet of motor cable is the lower side Outlet of motor cable Motor Cable guide Pass the motor cable through the cable guide of motor holder Motor holder Motor cable Protrusion Base plate Motor holder 3P socket unit Motor Outlet of motor cable ...

Page 69: ...en wiring the LED lead wire to the rear side of arm bed Screw LED lamp PCB LED lead wire Connector Screw Cord clamps PCB Set the cord clamp to the LED lead wire and secure it to the arm bed with the screw correctly 2 locations Be careful not to catch the LED lead wire because the ribs of rear cover contact here Be careful not to catch the LED lead wire because the ribs of rear cover contact here ...

Page 70: ...43H15HF888X62 64 67 72 73 74 77 82 84 87 ...

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Brother 888X Series, Service Manual

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