Brother 888X64 Series User manual

MODEL :

888X62/64/67/72/73/74/77/82/84/87 Series

Home Sewing Machine

SERVICE MANUAL

Nov.,2015

Jan.,2017

Published :

Revised :

c

2015 Brother Industries, Ltd.

CONFIDENTIAL

LIST of UPDATE RECORD

Date Added Models Contents

-

Nov.,2015 JS60, artwork10, JA20

-

Mar.,2016 XM1010, X4, HQ12, X8, HQ19

-

Mar.,2016

Jul.,2016

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, KE14sAZ14,

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

i

1. Outline of Mechanism .......................................................................1 - 1

Main mechanisms ..............................................................................................1 - 2

Driveline .............................................................................................................1 - 3

Positions of electronic components ...................................................................1 - 5

Control system block diagram ...........................................................................1 - 6

2. Basic of Disassembly and Assembling Note ...................................2 - 1

Preparation ........................................................................................................2 - 2

Disconnecting cables & Removing accessories .................................................................................2 - 2

Main frame and Covers .....................................................................................2 - 3

Removal of Face plate assy ...............................................................................................................2 - 4

Removal of Pattern selecting dial and Feed dial ................................................................................2 - 5

Removal of Front cover assy .............................................................................................................2 - 6

Removal of Rear cover assy / Bobbin presser / Thread guide assy ...................................................2 - 7

Main motor unit ..................................................................................................2 - 9

Removal of LED lamp assy .............................................................................................................2 - 10

Removal of Motor 3P supply assy ...................................................................................................2 - 11

Removal of Tension pulley 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-presser module .................................................................................................2 - 23

Feed unit ..........................................................................................................2 - 25

Removal of Feed unit .......................................................................................................................2 - 26

3. Adjustment ..........................................................................................3 - 1

Needle point damage .........................................................................................3 - 2

Timing belt tension .............................................................................................3 - 3

Motor belt tension ..............................................................................................3 - 4

Inner rotary hook plate assy position .................................................................3 - 5

Presser foot hole / Needle plate hole position (front/back) ................................3 - 6

Needle swing timing ...........................................................................................3 - 7

Three point needle drop .....................................................................................3 - 8

Needle interference left/right ..............................................................................3 - 9

Needle bar rising ..............................................................................................3 - 10

ii

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 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

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

1 - 2

Outline of Mechanism

Outline of

Mechanism

Outline of

Mechanism

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

1 - 3

Outline of Mechanism

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

1 - 4

Outline of Mechanism

Outline of

Mechanism

Outline of

Mechanism

Driveline

(B) Movement of feed dog and rotary hook

Feed dog

Upper shaft

pulley

Upper shaft

Feed regulator plate

A / B

Pulley

Timing belt

Feed arm A

Feed stand

Timing pulley

Motor belt

Main motor

Feed connecting

lever

Timing pulley DLower 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

Outer rotary

hook assy

Vertical adjuster screw

Vertical lever

Vertical adjuster screw

Vertical lever

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

1 - 6

Outline of Mechanism

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)

2 - 1

2

In this chapter, explains the disassembly and assembly of

the each module. When 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

Basic of Disassembly

2 - 2

Preparation

Basic 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

Basic of

Disassembly

Basic of Disassembly

2 - 3

Main frame and Covers

Basic of

Disassembly

Main frame and Covers location diagram

Basic of

Disassembly

Basic of Disassembly

2 - 4

Main frame and Covers

Basic of

Disassembly

1 Removal of Face plate 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

Basic of

Disassembly

Basic of Disassembly

2 - 5

Main frame and Covers

Basic of

Disassembly

2 Removal of Pattern selecting dial and Feed dial

1. Pull out the pattern 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

Basic of

Disassembly

Basic of Disassembly

2 - 6

Main frame and Covers

Basic of

Disassembly

3 Removal of Front cover assy

1. Remove the screw (taptite, pan (S/P W) 3x12) and the washer plain M3.5 from the front cover side.

Remove the two screws (taptite, cup P M4x20) and screw (taptite, bind P M3x16) 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 tray

Taptite, bind P M3x16

Screw, pan (S/P washer) M4x10

Front cover assy

Rear cover assy

Basic of

Disassembly

Basic of Disassembly

2 - 7

Main frame and Covers

Basic of

Disassembly

4 Removal of Rear cover assy / Bobbin presser / Thread guide assy

1. Pull down the 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

Presser foot lifter

Rear cover assy

Basic of

Disassembly

Basic of Disassembly

2 - 8

Main frame and Covers

Basic of

Disassembly

3. Remove the screw (taptite, 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

Basic of Disassembly

2 - 9

Main motor unit

Basic of

Disassembly

Basic of

Disassembly

Main motor unit location diagram

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