Brother J14, LS14, LX-1400, X14, L14 Service Manual
...
Home Sewing Machine
SERVICE MANUAL
MODEL :
J14/LS14/LX-1400/X14/L14/STAR1400
JS1400/JS1410/J17/LS17/LX-1700
X17/L17/JS1700/AS1430S/JSL15/JSL18/LS200
LS300/artwork19/artwork22/SL10/HQ18/X7/JX1410
JX1710/JX2517/AS1450/RS100/RS200/JX1400
JS1420/LS2225/LS2325/SL100/VitrageM71
VitrageM73/ArtCity140/JS1750/NB1400/NB1700
KD144/K14/F14/K17/F17/KE14/ArtCity170
CONFIDENTIAL
c
2012 Brother Industries, Ltd.
All rights reserved.
Published :
Revised :
Aug.,2012
May,2015
LIST of UPDATE RECORD
Date Added Models Contents
Dec.,2012 JS1700
Feb.,2013 AS1430S
Mar.,2013 X7/artwork19/JSL15/LS200
Mar.,2013 SL10/HQ18/artwork22/JSL18/LS300
Apr.,2013 JX1710/JX2517
May,2013 JX1410
Jul.,2013 AS1450
Sep.,2013 RS100/RS200
Mar.,2014 JX1400
Apr.,2014 JS1420
Jun.,2014
LS2225/LS2325
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-
Aug.,2014
Feb.,2015
Mar.,2015
Apr.,2015
Apr.,2015
May,2015
SL100
VitrageM71/VitrageM73
ArtCity140
JS1750/NB1400/NB1700
KD144/K14/F14/K17/F17/KE14
ArtCity170
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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/Assembly .......................................................2 - 1
Disassembly
Preparation ........................................................................................................2 - 2
Disconnecting cables & Removing accessories .................................................................................2 - 2
Main frame and Covers .....................................................................................2 - 3
Removal of Face plate assy and Front cover assy .............................................................................2 - 4
Removal of Rear cover assy and Base plate L/R ...............................................................................2 - 5
Main motor unit ..................................................................................................2 - 7
Removal of LED lamp assy ...............................................................................................................2 - 8
Removal of Motor 3P supply assy .....................................................................................................2 - 9
Feed unit / Feed control ...................................................................................2 - 10
Removal of Tension pulley assy and Lower shaft B assy ...............................................................2 - 11
Removal of Feed module .................................................................................................................2 - 12
Removal of Feed connecting lever assy ..........................................................................................2 - 13
Needle threading mechanism ..........................................................................2 - 14
Removal of Thread tension dial assembly .......................................................................................2 - 15
Pattern selecting mechanism ...........................................................................2 - 16
Removal of Pattern selecting unit assy ............................................................................................2 - 17
Bobbin winder, Upper shaft, Needle-presser module ......................................2 - 18
Removal of Bobbin winder assy ......................................................................................................2 - 19
Removal of Upper shaft assy ...........................................................................................................2 - 20
Removal of Needle-presser module .................................................................................................2 - 21
Assembly
Bobbin winder, Upper shaft, Needle-presser module ......................................2 - 23
Attachment of Needle-presser module ............................................................................................2 - 24
Attachment of Upper shaft assy .......................................................................................................2 - 26
Attachment of Bobbin winder assy ..................................................................................................2 - 27
Pattern selecting mechanism ...........................................................................2 - 28
Lubrication .......................................................................................................................................2 - 29
Attachment of Pattern selecting unit assy ........................................................................................2 - 30
Needle threading mechanism ..........................................................................2 - 32
Attachment of Thread tension dial assembly ...................................................................................2 - 33
Feed unit / Feed control ...................................................................................2 - 34
Lubrication .......................................................................................................................................2 - 35
Attachment of Feed connecting lever assy ......................................................................................2 - 36
Attachment of Feed module .............................................................................................................2 - 37
Attachment of Lower shaft B assy and Tension pulley assy ........................................................... 2 - 38
Phase matching of Upper shaft and Lower shaft .............................................................................2 - 39
i
Main motor unit ................................................................................................2 - 40
Attachment of Motor 3P supply assy ...............................................................................................2 - 41
Attachment of LED lamp assy .........................................................................................................2 - 42
Main frame and Covers ...................................................................................2 - 43
Attachment of Rear cover assy and Base plate L/R .........................................................................2 - 4 4
Attachment of Face plate assy and Front cover assy .......................................................................2 - 46
3. Application of Disassembly/Assembly .............................................3 - 1
Disassembly
Main frame and Covers .....................................................................................3 - 2
Disassembly of Face plate assy .........................................................................................................3 - 3
Disassembly of Rear cover assy ................................. .......................................................................3 - 4
Disassembly of Base plate L/R ..........................................................................................................3 - 5
Main motor unit ..................................................................................................3 - 6
Disassembly of Motor 3P supply assy ...............................................................................................3 - 7
Feed unit ............................................................................................................3 - 8
Disassembly of Tension pulley assy ..................................................................................................3 - 9
Disassembly of Lower shaft B assy .................................................................................................3 - 10
Disassembly of Feed module ...........................................................................................................3 - 11
Needle threading mechanism ..........................................................................3 - 19
Disassembly of Thread tension dial assembly .................................................................................3 - 20
Pattern selecting mechanism ...........................................................................3 - 21
Disassembly of Pattern selecting unit assy ...................................................................................... 3 - 22
Bobbin winder, Upper shaft, Needle-Presser module ......................................3 - 23
Disassembly of Bobbin winder assy ................................ ................................................................3 - 24
Disassembly of Upper shaft assy ........................................... .......................................................... 3 - 25
Disassembly of Needle-presser module ...........................................................................................3 - 26
Assembly
Bobbin winder, Upper shaft, Needle-Presser module ......................................3 - 30
Lubrication .......................................................................................................................................3 - 31
Assembly of Needle-presser module ...............................................................................................3 - 32
Assembly of Upper shaft assy .........................................................................................................3 - 36
Assembly of Bobbin winder assy ............................ ........................................................................3 - 37
Pattern selecting mechanism ...........................................................................3 - 38
Lubrication .......................................................................................................................................3 - 39
Assembly of Pattern selecting unit assy ..........................................................................................3 - 40
Needle threading mechanism ..........................................................................3 - 41
Assembly of Thread tension dial assembly .....................................................................................3 - 42
Feed unit ..........................................................................................................3 - 43
Lubrication .......................................................................................................................................3 - 44
Assembly of Feed module ...............................................................................................................3 - 45
Assembly of Lower shaft B assy .....................................................................................................3 - 53
Assembly of Tension pulley assy ....................................................................................................3 - 54
Main motor unit ................................................................................................3 - 55
Assembly of Motor 3P supply assy .................................................................................................3 - 56
ii
Main frame and Covers ...................................................................................3 - 57
Assembly of Base plate L/R ............................................................................................................3 - 58
Assembly of Rear cover assy ....................... ....................................................................................3 - 59
Assembly of Face plate assy ............................................................................................................3 - 60
4. Adjustment ..........................................................................................4 - 1
Removal of covers .............................................................................................4 - 2
Needle point damage .........................................................................................4 - 4
Timing belt tension .............................................................................................4 - 5
Motor belt tension ..............................................................................................4 - 6
Needle plate holder assy position ......................................................................4 - 7
Presser foot hole / Needle plate hole position (front/back) ................................4 - 8
Needle swing timing ...........................................................................................4 - 9
Three point needle drop ...................................................................................4 - 10
Needle interference left/right ............................................................................4 - 11
Needle bar rising ..............................................................................................4 - 12
Needle bar height ............................................................................................4 - 14
Needle clearance .............................................................................................4 - 15
Left straight stitch needle drop and
zigzag stitch maximum left needle drop position .............................................4 - 16
Feed dog position (front/back and left/right) ....................................................4 - 18
Feed dog height ...............................................................................................4 - 19
Upper thread tension .......................................................................................4 - 20
Left and right stitch of buttonhole stitch length ................................................4 - 22
Bobbin winder ..................................................................................................4 - 25
Lower thread tension .......................................................................................4 - 26
5. Failure Investigation for Electronic Parts .........................................5 - 1
Sewing lamp does not light ................................................................................5 - 2
Main motor does not turn or Rotation speed is slow ..........................................5 - 3
6. Special Instructions of Wiring ...........................................................6 - 1
Motor 3P supply assy ........................................................................................6 - 2
LED lead wire ....................................................................................................6 - 3
iii
1
Outline of Mechanism
Main mechanisms..................................................... 1 - 2
Driveline.................................................................... 1 - 3
Positions of electronic components........................... 1 - 5
Control system block diagram................................... 1 - 6
1 - 1
Outline of Mechanism
Main mechanisms
Bobbin winder Mechanism
Outline of
Mechanism
Needle bar / Presser foot
Mechanism
Front Side View
Zigzag Mechanism
Lower shaft Mechanism
Thread guide Mechanism
Horizontal feed Mechanism
Feed / Rotary hook Mechanism
Upper shaft Mechanism
Pattern selecting
Mechanism
Outline of
Mechanism
1 - 2
Back Side View
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
Main motor
Outline of
Mechanism
Needle bar crank
Needle bar
crank rod
Needle bar
block shaft
Needle bar block
Needle bar
Needle
Z finger frame
Thread take-up
counter weight
Needle bar
supporter
Pattern cam
Worm gear
Motor belt
Timing pulley
Upper shaft Pulley
Worm gear
Pattern cam
Z finger frame
Zigzag
connecting rod
Timing pulley
Selecting cam
Pulley
Outline of
Mechanism
A
Thread take-up counter weight
Needle bar crank rod
Needle bar block
Needle bar
supporter
Needle
Upper shaft
Needle bar crank
Needle bar block shaft
Zigzag connecting rod
Needle bar
1 - 3
Selecting cam
A
Motor belt
Main motor
Outline of Mechanism
Driveline
(B) Movement of feed dog and rotary hook
Main motor
Motor belt
Outline of
Mechanism
Lower shaft gear
Outer rotary
hook assy
Vertical lever
Vertical adjuster screw
Feed stand spring cap
Feed cam
Feed arm B
Feed arm A
Feed stand
Feed dog
Timing pulley DLower shaft
Feed adjuster
Timing belt
Feed connecting
lever
Upper shaft pulley
Upper shaft
pulley
Feed regulator plate
A / B
Timing pulley
Timing pulley
Upper shaft
Selecting cam
Pulley
Pattern selecting dial
Pulley
Outline of
Mechanism
Feed stand spring cap
Vertical lever
Feed dog
Feed stand
Lower shaft gear
Upper shaft
Feed cam
Feed connecting lever
Vertical adjuster screw
Feed adjuster
Feed arm A
Outer rotary hook assy
Selecting cam
Pattern selecting dial
Feed regulator plate A / B
Feed arm B
V feed attachment
Timing belt
Motor belt
Timing pulley D
Main motor
Lower shaft
1 - 4
Outline of Mechanism
Positions of electronic components
Outline of
Mechanism
Power supply PCB
Sewing lamp (LED)
3pin socket
Power SW
Main motor
Outline of
Mechanism
1 - 5
Outline of Mechanism
Control system block diagram
In the 3pin socket
Outline of
Mechanism
AC
Foot controller plug
(3pin)
Foot controller
3pin socket
Power SW
Power supply PCB
Sewing lamp
(LED)
Main motor
SEWING MACHINE
Outline of
Mechanism
1 - 6
Basic of
2
Disassembly/Assembly
When repair and replace the part of the unit, refer to
“CHAPTER 3: Application of Disassembly/Assembly”.
Disassembly Preparation...................................... 2 - 2
Main frame and Covers................... 2 - 3
Main motor unit................................ 2 - 7
Feed unit / Feed control................. 2 - 10
Needle threading mechanism........ 2 - 14
Pattern selecting mechanism ........ 2 - 16
Bobbin winder, Upper shaft,
Needle-presser module................. 2 - 18
Assembly Bobbin winder, Upper shaft,
Needle-presser module................. 2 - 23
Pattern selecting mechanism ........ 2 - 28
Needle threading mechanism........ 2 - 32
Feed unit / Feed control................. 2 - 34
Main motor unit.............................. 2 - 40
Main frame and Covers................. 2 - 43
2 - 1
Basic of Disassembly
Preparation
1 Disconnecting cables & Removing accessories
• Foot controller socket
• Needle
• Presser foot
• Accessory table
• Slide plate
• Bobbin
Basic of
Disassembly
Basic of
Disassembly
Foot controller socket
Needle
Presser foot
Accessory table
Slide plate
Bobbin
2 - 2
Basic of Disassembly
Main frame and Covers
Main frame and Covers location diagram
Basic of
Disassembly
Basic of
Disassembly
2 - 3
Basic of Disassembly
Main frame and Covers
1 Removal of Face plate assy and Front cover assy
1. Remove the screw (taptite, cup P M4X20) from the rear cover side, and then open the bottom side of
face plate assy to remove the face plate assy from the rear cover assy.
→Refer to 3 - 3 Disassembly of Face plate assy.
2. Remove the pattern selecting dial from the shaft of pattern selecting unit assy.
3. Remove the screw (screw, pan (S/P washer) M3X6) from the front cover side. And remove the three
screws (taptite, cup P M4X20) and screw (taptite, bind P M3X16) from the rear cover side.
4. Release the five hooks of front cover assy from the five hook trays of rear cover assy, and then open
the bottom side of front cover assy to remove the front cover assy from the rear cover assy.
→Refer to 3 - 4 Disassembly of Rear cover assy.
Basic of
Disassembly
Taptite, cup P
M4X20
Taptite, bind P
M3X16
Taptite, cup P M4X20
Taptite, bind P M3X16
Taptite, cup P M4X20
(Face plate assy)
Rear cover assy
Hook tray
Shaft of pattern
selecting unit assy
Hook trays
Taptite, Cup P M4X20
Screw, Pan (S/P washer) M3X6
Taptite, Bind P M3X16
Front cover assy
Basic of
Disassembly
Taptite, cup P
M4X20
Rear cover
assy
Hooks
Hook trays
Hooks
Pattern
selecting dial
Screw, pan (S/P washer) M3X6
Face plate assy
2 - 4
Basic of Disassembly
Main frame and Covers
2 Removal of Rear cover assy and Base plate L/R
1. Pull down the presser foot lifter.
2. Remove the three screws (taptite, cup P M4X20), and then remove the rear cover assy fro m the arm
bed while the "A" of rear cover assy is bending.
Taptite, Cup P M4X20
Rear cover assy
Basic of
Disassembly
Taptite, cup P M4X20
"A"
Basic of
Disassembly
Taptite, cup P
M4X20
Presser foot lifter
Taptite, cup P M4X20
2 - 5
Basic of Disassembly
3. Remove the two screws (taptite, bind S M4X10) to remove the base plate L from the bottom side of arm
bed.
4. Remove the two screws (taptite, bind S M4X10) to remove the base plate R from the bottom side of
arm bed.
Main frame and Covers
→Refer to 3 - 5 Disassembly of Base plate L/R.
Taptite, Bind S M4X10
Basic of
Disassembly
Base plate L
<bottom side>
Basic of
Disassembly
<bottom side>
Taptite, bind S M4X10
Base plate R
Taptite, bind S M4X10
Base plate L
Taptite, bind S M4X10
2 - 6
Basic of Disassembly
Main motor unit
Main motor unit location diagram
Basic of
Disassembly
Basic of
Disassembly
2 - 7
Basic of Disassembly
Main motor unit
1 Removal of LED lamp assy
1. Remove the two screws (taptite, bind S M4X10) to remove the two cord clamps from the arm bed, and
then remove the two cord clamps from the lead wire of LED lamp assy.
2. Disconnect the connector of LED lamp assy from the PCB of motor 3P supply assy.
Taptite, Bind S M4X10
Taptite, bind S M4X10
Basic of
Disassembly
Lead wire of LED
lamp assy
PCB
Cord clamps
Motor 3P
supply assy
3. Remove the screw (screw, pan (S/P washer) M4X8) to remove the LED lamp assy from the b ase holder
assy.
Screw, Pan (S/P washer) M4X8
Connector of LED
lamp assy
Basic of
Disassembly
Screw, pan (S/P washer) M4X8
Base holder assy
LED lamp assy
2 - 8
Basic of Disassembly
Main motor unit
2 Removal of Motor 3P supply assy
1. Remove the timing belt from the T pulley and motor T-pulley.
2. Remove the two screws (taptite, bind S M4X10) to remove the motor assy of motor 3P supply assy
from the arm bed.
3. Remove the two screws (taptite, cup P M4X20) to remove the 3P socket unit of motor 3P supply assy
from the arm bed.
→Refer to 3 - 7 Disassembly of Motor 3P supply assy.
Taptite, Bind S M4X10
Basic of
Disassembly
Taptite, Cup P M4X20
Motor assy
Taptite, bind S
M4X10
Taptite, cup P
M4X20
T pulley
3P socket unit
Timing belt
Basic of
Disassembly
Taptite, bind S
M4X10
Motor T-pulley
Taptite, cup P M4X20
2 - 9
Basic of Disassembly
Feed unit / Feed control
Feed unit / Feed control location diagram
Basic of
Disassembly
Basic of
Disassembly
2 - 10
Basic of Disassembly
Feed unit / Feed control
1 Removal of Tension pulley assy and Lower shaft B assy
1. Remove the two screws (taptite, bind S M4X10) to remove the tension pulley assy from th e arm bed.
→Refer to 3 - 9 Disassembly of Tension pulley assy.
Taptite, Bind S M4X10
Basic of
Disassembly
Basic of
Disassembly
Tension pulley assy
Taptite, bind S M4X10
2. Remove the timing belt from the timing pulley D of lower shaft B assy.
3. Remove the screw (taptite, bind S M4X10) to remove the bushing presser from the arm bed.
4. Remove the two screws (set screw, socket (CP) M5X5) from the fixed joint. And pull out the lower shaft
B assy from the fixed joint of feed module while lifting up the lower shaft bushing of lower shaft B assy.
→Refer to 3 - 10 Disassembly of Lower shaft B assy.
Feed module
Fixed joint
Taptite, Bind S M4X10
Set Screw, Socket (CP) M5X5
Hex wrench 2.5 mm
Set screw, socket
(CP) M5X5
Lower shaft B assy
Taptite, bind S M4X10
Timing belt
Bushing presser
Lower shaft bushing
Timing pulley D
2 - 11
Basic of
Disassembly
Basic of Disassembly
Feed unit / Feed control
2 Removal of Feed module
1. Remove the spring (XF5134) from the feed adjusting shaft of feed connecting lever assy and the arm
bed.
2. Remove the three screws (screw, pan (S/P washer) M4X10) from the feed module. And lift up the feed
module to remove it from the two bosses on arm bed, and slide it in the direction of the arrow to remove
the feed adjuster of feed module from the feed adjusting shaft of feed connecting lever assy.
→Refer to 3 - 11 Disassembly of Feed module.
Spring (XF5134)
Pin
Feed adjusting
shaft
Bosses
Spring
(XF5134)
Basic of
Disassembly
Feed module
Screw, Pan (S/P washer) M4X10
Screw, pan
(S/P washer) M4X10
2 - 12
Basic of Disassembly
Feed unit / Feed control
3 Removal of Feed connecting lever assy
1. Remove the spring extension C (XE9262) from the fee d connecting lever of feed connecting lever assy
and the pattern selecting unit assy.
2. Remove the two screws (taptite, bind S M4X10) to remove the feed adjusting shaft holder of feed
connecting lever assy from the arm bed. And turn the feed connecting lever of feed connecting lever
assy 90 degrees to remove it from the feed regulator plate B of pattern selecting unit assy.
Taptite, Bind S M4X10
Basic of
Disassembly
Spring extension C (XE9262)
Pattern selecting
unit assy
Feed connecting lever assy
Feed regulator plate B
Basic of
Disassembly
90°
Spring
extension C
(XE9262)
Boss
Feed connecting lever
Feed adjusting shaft holder
2 - 13
Taptite, bind S M4X10
Basic of Disassembly
Needle threading mechanism
Needle threading mechanism location diagram
Basic of
Disassembly
Basic of
Disassembly
2 - 14
Basic of Disassembly
Needle threading mechanism
1 Removal of Thread tension dial assembly
1. Remove the spring (XF3522) from the tension control holder assy of thread ten sion dial assem bly and
the zigzag connecting rod.
2. Remove the two screws (taptite, bind S M4X10) to remove the thread tension dial assembly from the
arm bed.
→Refer to 3 - 20 Disassembly of Thread tension dial assembly.
Taptite, Bind S M4X10
Basic of
Disassembly
Spring (XF3522)
Thread tension dial assembly
Taptite, bind S M4X10
Basic of
Disassembly
Tension control holder assy
Zigzag connecting rod
Spring (XF3522)
2 - 15
Basic of Disassembly
Pattern selecting mechanism
Pattern selecting mechanism location diagram
Basic of
Disassembly
Basic of
Disassembly
2 - 16
Basic of Disassembly
Pattern selecting mechanism
1 Removal of Pattern selecting unit assy
1. Remove the screw (screw, pan M3X10) to remove the zigzag adjusting nut from the base holder assy
of needle unit supply assy. And remove the retaining ring E4 to remove the zigzag connecting rod from
the shaft of pattern selecting unit assy.
Screw, Pan M3X10
Needle unit supply assy
Basic of
Disassembly
Shaft
Pattern selecting
unit assy
Retaining ring E4
Zigzag connecting rod
Zigzag adjusting nut
Screw, pan M3X10
2. Remove the four screws (taptite, bind S M4X10) to remove the pattern selecting unit assy from the arm
bed.
→Refer to 3 - 22 Disassembly of Pattern selecting unit assy.
Taptite, Bind S M4X10
Basic of
Disassembly
Pattern selecting unit assy
2 - 17
Taptite, bind S M4X10
Basic of Disassembly
Bobbin winder, Upper shaft, Needle-presser module
Bobbin winder, Upper shaft, Needle-presser module location diagram
Basic of
Disassembly
Basic of
Disassembly
2 - 18
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