Baby Lock BLDY User manual

MODEL:
BLDY/BLDY2
Home Sewing Machine
SERVICE MANUAL
Sep.,2014
Jun.,2016
Published :
Revised :
CONFIDENTIAL

LIST of UPDATE RECORD
Date Added Models Contents
Changed 4-13
Added 4-52 to 55
May,2015
-
-
Jun,2016 BLDY2

i
REGULATION ................................................................................................ x
SAFETY INFORMATION ............................................................................. xii
1. Outline of Mechanism ........................................................................1 - 1
Main mechanisms ..............................................................................................1 - 2
Driveline .............................................................................................................1 - 3
Positions of electronic components ...................................................................1 - 5
Control system block diagram ...........................................................................1 - 7
Layout for PCB connectors ................................................................................1 - 8
Operation of other electronic components .......................................................1 - 10
2. Basic of Disassembly/Assembly .......................................................2 - 1
Disassembly
Preparation ........................................................................................................2 - 2
Disconnecting cables and removing accessories ...............................................................................2 - 2
Main frame and covers ......................................................................................2 - 3
Removal of Top cover unit assy and Accessory table assy ...............................................................2 - 4
Removal of Needle plate B assy, Free arm cover and Free arm front cover assy .............................2 - 5
Removal of Face plate assy and Front thread guard cover ................................................................2 - 6
Removal of Belt cover and Belt cover lower assy .............................................................................2 - 7
Removal of Bobbin winder unit cover assy .......................................................................................2 - 8
Removal of Front cover assy .............................................................................................................2 - 9
Removal of Rear cover assy ............................................................................................................2 - 10
Removal of Free arm plate and Base plate cover ............................................................................2 - 11
Removal of Knee lifter assembly, Connector holder assy and UW pen connector PCB assy ........2 - 12
Removal of LED PCB holder A/B ..................................................................................................2 - 13
Removal of Upper unit relay PCB assy ...........................................................................................2 - 14
Electric parts and Main motor unit ...................................................................2 - 15
Removal of Main PCB assy .............................................................................................................2 - 16
Removal of Main motor assembly ...................................................................................................2 - 17
Removal of Power unit ....................................................................................................................2 - 18
Removal of Spiral tube ....................................................................................................................2 - 19
Removal of Extension IF PCB assy .................................................................................................2 - 20
Needle threading mechanism ..........................................................................2 - 21
Removal of LED lamp holder L assy ..............................................................................................2 - 22
Removal of Thread unit assy ...........................................................................................................2 - 23
Lower driving mechanism ................................................................................2 - 24
Removal of Side feed assy ...............................................................................................................2 - 25
Removal of Drop unit assy, Feed module and Thread cutter module .............................................2 - 26
Removal of Lower shaft A assy .......................................................................................................2 - 27
LED lamp / Upper driving mechanism .............................................................2 - 28
Removal of Tension pulley assy ......................................................................................................2 - 29
Removal of Upper shaft cover .........................................................................................................2 - 30
Removal of Upper shaft assy ...........................................................................................................2 - 31
Removal of Laser module assy ........................................................................................................2 - 32
Removal of LED lamp holder R assy ..............................................................................................2 - 33

ii
Removal of Thread drive unit assy ..................................................................................................2 - 34
Removal of Needle-presser module .................................................................................................2 - 36
Assembly
LED lamp / Upper driving mechanism .............................................................2 - 37
Lubrication .......................................................................................................................................2 - 38
Attachment of Needle-presser module ............................................................................................2 - 39
Attachment of Thread drive unit assy ..............................................................................................2 - 40
Attachment of LED lamp holder R assy ..........................................................................................2 - 42
Attachment of Laser module assy ....................................................................................................2 - 43
Attachment of Upper shaft assy .......................................................................................................2 - 44
Attachment of Upper shaft cover .....................................................................................................2 - 45
Attachment of Tension pulley assy ..................................................................................................2 - 46
Lower driving mechanism ................................................................................2 - 47
Lubrication .......................................................................................................................................2 - 48
Attachment of Lower shaft A assy ..................................................................................................2 - 49
Attachment of Thread cutter module, Feed module and Drop unit assy .........................................2 - 50
Attachment of Side feed assy ...........................................................................................................2 - 51
Needle threading mechanism ..........................................................................2 - 52
Attachment of Thread unit assy .......................................................................................................2 - 53
Attachment of LED lamp holder L assy ..........................................................................................2 - 54
Electric parts and Main motor unit ...................................................................2 - 55
Attachment of Extension IF PCB assy ............................................................................................2 - 56
Attachment of Spiral tube ................................................................................................................2 - 57
Attachment of Power unit ................................................................................................................2 - 58
Attachment of Main motor assembly ...............................................................................................2 - 59
Attachment of Main PCB assy .........................................................................................................2 - 60
Main frame and covers ....................................................................................2 - 61
Attachment of Upper unit relay PCB assy .......................................................................................2 - 62
Attachment of LED PCB holder A/B ..............................................................................................2 - 63
Attachment of UW pen connector PCB assy, Connector holder assy and Knee lifter assembly ....2 - 64
Attachment of Base plate cover and Free arm plate ........................................................................2 - 65
Attachment of Rear cover assy ........................................................................................................2 - 66
Attachment of Front cover assy .......................................................................................................2 - 67
Attachment of Bobbin winder unit cover assy .................................................................................2 - 68
Attachment of Belt cover .................................................................................................................2 - 69
Attachment of Front thread guard cover and Face plate assy ..........................................................2 - 70
Attachment of Free arm front cover assy, Free arm cover and Needle plate B assy .......................2 - 71
Attachment of Accessory table assy and Top cover unit assy .........................................................2 - 72
3. Application of Disassembly/Assembly .............................................3 - 1
Disassembly
Main frame and covers ......................................................................................3 - 2
Disassembly of Accessory table assy ................................................................................................3 - 3
Disassembly of Needle plate B assy ..................................................................................................3 - 3
Disassembly of Face plate assy .........................................................................................................3 - 4
Disassembly of Belt cover assy .........................................................................................................3 - 5
Disassembly of Belt cover lower assy ...............................................................................................3 - 5
Disassembly of Front cover assy .......................................................................................................3 - 6
Removal of VR PCB assy, SV keytop assy, Threader switch PCB assy and Threader button ....3 - 6
Removal of Threader switch PCB assy, SS PCB assy and Buttons ..............................................3 - 7
Removal of Lead wire assy main-panel and Speaker assy ............................................................3 - 8

iii
Removal of USB cover, Head phone jack assy and Ground plate USB holder ............................3 - 9
Removal of Panel PCB assy and Panel board holder ..................................................................3 - 10
Removal of FC jack assy .............................................................................................................3 - 12
Removal of LCD assy .................................................................................................................3 - 13
Removal of Lamp cover L/R .......................................................................................................3 - 15
Disassembly of Rear cover assy ......................................................................................................3 - 16
Disassembly of Connector holder assy ............................................................................................3 - 17
Removal of Sensor connector holder D ...........................................................................................3 - 17
Removal of Belt cover support plate ...............................................................................................3 - 18
Removal of SW holder ....................................................................................................................3 - 18
Removal of Connecting PCB holder and Extension connector holder U ........................................3 - 19
Removal of Handle assy ..................................................................................................................3 - 20
Removal of Base plate sub assy .......................................................................................................3 - 21
Bobbin winding mechanism .............................................................................3 - 22
Disassembly of Bobbin winder unit cover assy ...............................................................................3 - 23
Electric parts and main motor unit ...................................................................3 - 27
Removal of Main PCB holder plate A/B .........................................................................................3 - 28
Disassembly of Main motor assembly .............................................................................................3 - 28
Disassembly of Power unit ..............................................................................................................3 - 29
Needle threading mechanism ..........................................................................3 - 30
Removal of Thread guide and Thread guard plate B .......................................................................3 - 31
Removal of Thread guide cover assy ...............................................................................................3 - 32
Removal of Upthread PCB assy and Thread guide wire .................................................................3 - 33
Removal of Thread guide, AT INIT PCB assy, ATPM sensor plate and Plate assembly ...............3 - 34
Removal of Thread catching case A/B and Thread cutting shutter .................................................3 - 35
Removal of ATPM insulation assy and Tension release unit ..........................................................3 - 36
Removal of Thread guide shutter link A/B/C ..................................................................................3 - 37
Lower driving mechanism ................................................................................3 - 38
Removal of Reversal link assy, Pull link and Reversal link plate assy ...........................................3 - 39
Removal of Lead wire guide holder and Needle plate B switch assy ..............................................3 - 40
Removal of Joint ..............................................................................................................................3 - 41
Removal of Sheet .............................................................................................................................3 - 41
LED light / Upper driving mechanism ..............................................................3 - 42
Disassembly of Upper shaft cover ...................................................................................................3 - 43
Disassembly of Upper shaft assy .....................................................................................................3 - 43
Disassembly of LED lamp holder L assy ........................................................................................3 - 44
Disassembly of LED lamp holder R assy ........................................................................................3 - 44
Removal of Adjusting screw and Plate spring .................................................................................3 - 45
Removal of Tension pulley holder B assy .......................................................................................3 - 45
Feed module ....................................................................................................3 - 46
Removal of Needle plate A assy, Inner rotary hook assy and Inner rotary hook bracket assy .......3 - 47
Removal of Outer rotary hook assy, Feed bar assy and Lock nut ...................................................3 - 48
Removal of Vertical feed bush and Drop lever Q ...........................................................................3 - 50
Removal of Lower shaft B assy and Drop assy ...............................................................................3 - 51
Removal of FPM holder assy, F INIT PCB assy and Feed adjuster gear assy ................................3 - 53
Removal of Feed arm assy and Stopper plate block assy ................................................................3 - 55
Thread cutter module .......................................................................................3 - 56
Removal and disassembly of Thread cutter assy .............................................................................3 - 57
Removal of Thread cutter lever, Photo transistor PCB assy, PF pulse motor assy and Gears ........3 - 58
Needle-presser module ...................................................................................3 - 60
Removal of Camera relay PCB assy ................................................................................................3 - 61

iv
Removal of Presser foot holder assy and BH switch assy ...............................................................3 - 63
Removal of PT holder assembly and PF switch assy ......................................................................3 - 64
Removal of PFPM insulation assy, PF INIT PCB assy and Presser PM holder ..............................3 - 65
Removal of Presser dial, Presser dial gear and Lock nut .................................................................3 - 66
Removal of Adjusting plate assy and Lift lever ..............................................................................3 - 67
Removal of Z INIT PCB assy and Pulse motor Z ...........................................................................3 - 68
Removal of Spring guard and Release guide plate ..........................................................................3 - 69
Removal of Needle bar assy, Needle bar hook stand assy and Needle thread block .......................3 - 70
Removal of W presser adjust plate, Needle holder block assy,
Presser bar support plate and Needle holder block base ..................................................................3 - 71
Removal of Zigzag adjusting nut .....................................................................................................3 - 72
Removal of Springs .........................................................................................................................3 - 73
Removal of Needle bar supporter assy and Thread guide plate ......................................................3 - 74
Removal of Threader hook assy ......................................................................................................3 - 75
Removal of Lever AB ......................................................................................................................3 - 76
Removal of Z zigzag release cam, Z zigzag lever sub assy and Release plate assy ........................3 - 77
Removal of Needle bar crank rod assy, Thread take-up lever assy,
Thread take-up counter weight and Unit shaft .................................................................................3 - 79
Removal of Thread take-up lever link, Presser bar and Presser bar clamp assy .............................3 - 80
Embroidery unit ................................................................................................3 - 81
Removal of YPM cover and X carriage cover .................................................................................3 - 82
Removal of E hoop stay plate assy ..................................................................................................3 - 83
Disassembly of E hoop stay plate assy ............................................................................................3 - 84
Removal of ES main cover assy ......................................................................................................3 - 85
Removal of EMB relay PCB assy ....................................................................................................3 - 86
Removal of ES base cover unit ........................................................................................................3 - 87
Removal of Lead wire assy EMB unit V .........................................................................................3 - 88
Removal of CW switch assy ............................................................................................................3 - 89
Removal of X roller guide plate ......................................................................................................3 - 90
Removal of Adjusting screw assy and ES base cover LID CW ......................................................3 - 91
Removal of Y relay PCB assy .........................................................................................................3 - 92
Removal of XY pulse motor assy and Y INIT PCB assy ................................................................3 - 93
Removal of Flexible flat cable:SML2CD-6 and Hole cover ...........................................................3 - 94
Removal of Y carriage assy .............................................................................................................3 - 96
Removal of Y slider and Timing belt ..............................................................................................3 - 97
Removal of X roller plate assy ........................................................................................................3 - 98
Removal of XY pulse motor assy and X INIT PCB assy ................................................................3 - 99
Removal of Timing belt .................................................................................................................3 - 100
Dual feed assy ...............................................................................................3 - 101
Disassembly of Dual feed assy ......................................................................................................3 - 102
Assembly
LED light / Upper driving mechanism ............................................................3 - 104
Attachment of Tension pulley holder B assy .................................................................................3 - 105
Attachment of Plate spring and Adjusting screw ...........................................................................3 - 105
Assembly of LED lamp holder R assy ...........................................................................................3 - 106
Assembly of LED lamp holder L assy ...........................................................................................3 - 106
Assembly of Upper shaft assy .......................................................................................................3 - 107
Assembly of Upper shaft cover .....................................................................................................3 - 107
Lower driving mechanism ..............................................................................3 - 108
Attachment of Sheet .......................................................................................................................3 - 109
Attachment of Joint ........................................................................................................................3 - 109
Attachment of Needle plate B switch assy and Lead wire guide holder .......................................3 - 110
Attachment of Reversal link plate assy, Pull link and Reversal link assy .....................................3 - 111

v
Needle threading mechanism ........................................................................3 - 112
Lubrication .....................................................................................................................................3 - 113
Attachment of Thread guide shutter link A/B/C ............................................................................3 - 114
Attachment of Tension release unit and ATPM insulation assy ....................................................3 - 115
Attachment of Thread cutting shutter and Thread catching case A/B ...........................................3 - 116
Attachment of Plate assembly, ATPM sensor plate, AT INIT PCB assy and Thread guide .........3 - 117
Attachment of Thread guide wire and Upthread PCB assy ...........................................................3 - 118
Attachment of Thread guide cover assy ........................................................................................3 - 119
Attachment of Thread guard plate B and Thread guide .................................................................3 - 120
Electric parts and main motor unit .................................................................3 - 121
Assembly of Power unit .................................................................................................................3 - 122
Assembly of Main motor assembly ...............................................................................................3 - 122
Attachment of Main PCB holder plate A/B ...................................................................................3 - 123
Bobbin winding mechanism ...........................................................................3 - 124
Assembly of Bobbin winder unit cover assy .................................................................................3 - 125
Main frame and covers ..................................................................................3 - 129
Attachment of Base plate sub assy ................................................................................................3 - 130
Attachment of Handle assy ............................................................................................................3 - 131
Attachment of Extension connector holder U and Connecting PCB holder ..................................3 - 132
Attachment of SW holder ..............................................................................................................3 - 133
Assembly of Belt cover support plate ............................................................................................3 - 133
Attachment of Sensor connector holder D .....................................................................................3 - 134
Assembly of Connector holder assy ..............................................................................................3 - 134
Assembly of Rear cover assy .........................................................................................................3 - 135
Assembly of Front cover assy ........................................................................................................3 - 136
Attachment of Lamp cover L/R ................................................................................................3 - 136
Attachment of LCD assy ...........................................................................................................3 - 137
Attachment of FC jack assy ......................................................................................................3 - 139
Attachment of Panel board holder and Panel PCB assy ............................................................3 - 140
Attachment of Ground plate USB holder, Head phone jack assy and USB cover ....................3 - 142
Attachment of Speaker assy and Lead wire assy main-panel ...................................................3 - 143
Attachment of Buttons, SS PCB assy and Threader switch PCB assy .....................................3 - 144
Attachment of SV keytop assy and VR PCB assy ....................................................................3 - 145
Assembly of Belt cover lower assy ................................................................................................3 - 146
Assembly of Belt cover assy ..........................................................................................................3 - 146
Assembly of Face plate assy ..........................................................................................................3 - 147
Assembly of Needle plate B assy ..................................................................................................3 - 147
Assembly of Accessory table assy .................................................................................................3 - 148
Needle-presser module .................................................................................3 - 149
Lubrication .....................................................................................................................................3 - 150
Attachment of Presser bar clamp assy, Presser bar and Thread take-up lever link .......................3 - 152
Attachment of Unit shaft, Thread take-up counter weight, Thread take-up lever assy and
Needle bar crank rod assy ..............................................................................................................3 - 153
Attachment of Release plate assy, Z zigzag lever sub assy and Z zigzag release cam ..................3 - 154
Attachment of Lever AB ................................................................................................................3 - 156
Attachment of Threader hook assy ................................................................................................3 - 157
Attachment of Thread guide plate and Needle bar supporter assy ................................................3 - 158
Attachment of Springs ...................................................................................................................3 - 159
Attachment of Zigzag adjusting nut ...............................................................................................3 - 160
Attachment of Needle holder block base, Presser bar support plate,
Needle holder block assy and W presser adjust plate ....................................................................3 - 161
Attachment of Needle thread block, Needle bar hook stand assy and Needle bar assy ................3 - 162
Attachment of Release guide plate and Spring guard ....................................................................3 - 163
Attachment of Pulse motor Z and Z INIT PCB assy .....................................................................3 - 164

vi
Attachment of Lift lever and Adjusting plate assy ........................................................................3 - 165
Attachment of Lock nut, Presser dial gear and Presser dial ..........................................................3 - 166
Attachment of Presser PM holder, PF INIT PCB assy and PFPM insulation assy .......................3 - 167
Attachment of PF switch assy and PT holder assembly ................................................................3 - 168
Attachment of BH switch assy and Presser foot holder assy .........................................................3 - 169
Attachment of Camera relay PCB assy ..........................................................................................3 - 170
Thread cutter module .....................................................................................3 - 172
Lubrication .....................................................................................................................................3 - 173
Attachment of Gears, PF pulse motor assy, Photo transistor PCB assy and Thread cutter lever ..3 - 174
Assembly and Attachment of Thread cutter assy ..........................................................................3 - 176
Feed module ..................................................................................................3 - 177
Lubrication .....................................................................................................................................3 - 178
Attachment of Stopper plate block assy and Feed arm assy ..........................................................3 - 180
Attachment of Feed adjuster gear assy, F INIT PCB assy and FPM holder assy ..........................3 - 181
Attachment of Drop assy and Lower shaft B assy .........................................................................3 - 183
Alignment of Feed adjuster gear assy and F initial shutter position ..............................................3 - 185
Attachment of Drop lever Q and Vertical feed bush .....................................................................3 - 186
Attachment of Lock nut, Feed bar assy and Outer rotary hook assy .............................................3 - 187
Attachment of Inner rotary hook bracket assy,
Inner rotary hook assy and Needle plate A assy ............................................................................3 - 189
Embroidery unit ..............................................................................................3 - 190
Lubrication .....................................................................................................................................3 - 191
Assembly of Timing belt ...............................................................................................................3 - 192
Attachment of X INIT PCB assy and XY pulse motor assy ..........................................................3 - 193
Attachment of X roller plate assy ..................................................................................................3 - 194
Attachment of Timing belt and Y slider ........................................................................................3 - 195
Attachment of Y carriage assy .......................................................................................................3 - 196
Attachment of Hole cover and Flexible flat cable:SML2CD-6 .....................................................3 - 197
Attachment of Y INIT PCB assy and XY pulse motor assy ..........................................................3 - 199
Attachment of Y relay PCB assy ...................................................................................................3 - 200
Attachment of Adjusting screw assy and ES base cover LID CW ................................................3 - 201
Attachment of X roller guide plate ................................................................................................3 - 202
Attachment of CW switch assy ......................................................................................................3 - 203
Attachment of Lead wire assy EMB unit V ...................................................................................3 - 204
Attachment of ES base cover unit ..................................................................................................3 - 205
Attachment of EMB relay PCB assy .............................................................................................3 - 206
Attachment of ES main cover assy ................................................................................................3 - 207
Assembly of E hoop stay plate assy ...............................................................................................3 - 208
Attachment of E hoop stay plate assy ............................................................................................3 - 209
Attachment of X carriage cover and YPM cover ..........................................................................3 - 210
Dual feed assy ...............................................................................................3 - 211
Assembly of Dual feed assy ...........................................................................................................3 - 212
4. Adjustment ..........................................................................................4 - 1
Needle point damage .........................................................................................4 - 2
Start test mode (with front cover) .......................................................................4 - 3
Contents ............................................................................................................4 - 4
Touch panel .....................................................................................................4 - 11
Timing belt tension ...........................................................................................4 - 12
Timing belt and belt support upper/lower clearance ........................................4 - 13

vii
Motor belt tension ............................................................................................4 - 14
Fine tension .....................................................................................................4 - 15
Upper thread tension .......................................................................................4 - 16
Upper shaft shutter angle ................................................................................4 - 17
Upper shaft cover position ................................................................................4 - 18
Front/back position of needle and presser foot ................................................4 - 19
Left base line needle drop ...............................................................................4 - 20
Needle clearance left/right ...............................................................................4 - 21
Needle bar rising ..............................................................................................4 - 22
Needle bar height ............................................................................................4 - 23
Needle clearance .............................................................................................4 - 24
Needle threader ...............................................................................................4 - 25
Presser bar height ...........................................................................................4 - 26
Fabric thickness setting ...................................................................................4 - 27
Knee lifter position ...........................................................................................4 - 28
Feed dog height and parallelism ......................................................................4 - 29
Front/back and left/right position of feed dog ...................................................4 - 31
Feed forward/backward ...................................................................................4 - 32
Side feed straight stitch ...................................................................................4 - 34
One point .........................................................................................................4 - 35
BH lever switch position ...................................................................................4 - 36
Inner rotary hook bracket position ...................................................................4 - 38
Lower thread tension (standard inner rotary hook assy) .................................4 - 39
Guide line marker position ...............................................................................4 - 40
Spool stand LED check ...................................................................................4 - 42
Spool stand LED color correcting ....................................................................4 - 43
Camera calibration ...........................................................................................4 - 44
Camera angle ..................................................................................................4 - 49
Sensor Pen Calibration ( for software Ver. 1.2 or later) ...................................4 - 52
LED pointer position (embroidery foot with LED pointer) .................................4 - 56
Feed length of dual feed foot ...........................................................................4 - 57
Belt tension (embroidery unit) ..........................................................................4 - 58
X carriage height (embroidery unit) .................................................................4 - 59
Embroidery center position (embroidery unit) ..................................................4 - 60
F, Z pulse motor phase ....................................................................................4 - 62
Thread take up spring tension .........................................................................4 - 63

viii
5. Failure Investigation for Electronic Parts .........................................5 - 1
Error message list ..............................................................................................5 - 2
Power does not come on ...................................................................................5 - 3
Pulse motors do not return to original position ..................................................5 - 5
Touch panel does not work ................................................................................5 - 7
Main motor does not turn ...................................................................................5 - 8
Main motor rotation error .................................................................................5 - 10
Cannot sew pattern normally ...........................................................................5 - 11
Cannot sew button holes normally ...................................................................5 - 12
Stitch length and zigzag width cannot be adjusted manually ..........................5 - 13
Problems with vertical needle movement and reverse stitching ......................5 - 14
Does not operate with foot controller ...............................................................5 - 15
Needle bar release does not work normally ....................................................5 - 16
Thread tensioning does not go well .................................................................5 - 17
Thread cutter does not work normally .............................................................5 - 18
Bobbin winder motor does not rotate ...............................................................5 - 19
LED lamp does not light ...................................................................................5 - 20
Lower thread detection does not work normally ..............................................5 - 22
Upper thread sensor does not work normally ..................................................5 - 23
Automatic needle threader does not work correctly .........................................5 - 24
Presser foot lifter does not work correctly ........................................................5 - 26
USB host does not work properly ....................................................................5 - 29
USB function does not work properly ..............................................................5 - 30
Sound does not work .......................................................................................5 - 31
No sound from headphone jack .......................................................................5 - 32
Spool stand LED does not light .......................................................................5 - 33
Camera cannot be reflected normally ..............................................................5 - 34
Embroidery unit does not operate normally .....................................................5 - 35
Unable to detect or lock frame .........................................................................5 - 37
Line marker does not operate normally ...........................................................5 - 39
Sensor pen does not operate normally ............................................................5 - 41
Dual feed foot does not operate normally ........................................................5 - 43
Embroidery pointer does not operate normally ................................................5 - 45
Error is displayed .............................................................................................5 - 47
Replacement of main PCB assy or panel PCB assy .......................................5 - 51
Correspondence table of “Model” and “Printed-circuit board” ..........................5 - 52

ix
6. Maintenance ........................................................................................6 - 1
How to reset counter of the maintenance ..........................................................6 - 2
Necessary grease & oil ......................................................................................6 - 3
Maintenance point .............................................................................................6 - 4
7. Special Instructions of Wiring ...........................................................7 - 1
Module wiring ..................................................................................7 - 2
Main body wiring .............................................................................7 - 6
Front cover wiring .........................................................................7 - 20
Embroidery unit wiring ..................................................................7 - 25
Dual feed assy wiring ....................................................................7 - 32

x
REGULATION
LASER SAFETY (For U.S.A. only)
This sewing machine is certified as a Class 1 laser product under the US Department of Health and
Human Services (DHHS) Radiation Performance Standard according to the Radiation Control for
Health and Safety Act of 1968. This means that the sewing machine does not produce hazardous
laser radiation.
The laser beam emitted by the laser unit installed in this machine is restricted to an output at a safe
level.
FDA REGULATIONS (For U.S.A. only)
The US Food and Drug Administration (FDA) has implemented regulations for laser products
manufactured on and after August 2, 1976. Compliance is mandatory for products marketed in the
United States. One of the following labels on the back of the sewing machine indicates compliance
with the FDA regulations and must be attached to laser products marketed in the United States.
The label for TAIWAN manufactured products
IEC 60825-1:2007
This sewing machine is a Class 1 laser product as defined in IEC 60825-1:2007 specifications.
Caution
Use of controls, adjustments or performance of procedures other than those specified in this manual
may result in hazardous radiation exposure.
Tacony Corporation
1760 Gilsinn Lane Fenton, Missouri 63026, U.S.A.
This product complies with FDA performance standards for laser
products except for deviations pursuant to Laser Notice No. 50,
dated June 24, 2007.

xi
IEC 60825-1:2007 (For countries except U.S.A.)
This sewing machine is a Class 1 laser product as defined in IEC 60825-1:2007 specifications.
This sewing machine has a laser diode which emits visible laser radiation in the Laser module. Do not
disassemble the Laser module. Since the variable resistor in the laser module is adjusted in
accordance with the standards, never touch it.
Caution
Use of controls, adjustments or performance of procedures other than those specified in this manual
may result in hazardous radiation exposure.

xii
SAFETY INFORMATION
CAUTION FOR LASER PRODUCT
CAUTION: When the machine during servicing is operated with the cover open, the regulations of
VBG 93 and the performance instructions for VBG 93 are valid.
CAUTION: In case of any trouble with the Laser module, replace the Laser module itself. To prevent
direct exposure to the laser beam, do not try to disassemble the Laser module.
ADDITIONAL INFORMATION
When replacing the Laser module or adjusting it, be careful not to enter the laser beam into your eyes.
<Location of the Laser module>

1 - 1
1
Main mechanisms ..................................................... 1 - 2
Driveline .................................................................... 1 - 3
Positions of electronic components........................... 1 - 5
Control system block diagram................................... 1 - 7
Layout for PCB connectors ....................................... 1 - 8
Operation of other electronic components .............. 1 - 10
Outline of Mechanism

1 - 2
Outline of Mechanism
Outline of
Mechanism
Outline of
Mechanism
Main mechanisms
Main body
Embroidery unit
Upper shaft mechanism
Side feed mechanism
Lower shaft mechanism
Feed dog drop mechanism
Feed / Rotary hook mechanism
Thread cutting
mechanism
Bobbin winder mechanism
Thread tension mechanism
Needle thread drive mechanism
Needle bar /
Presser foot mechanism
Y belt
Y driving gear & pulley
Y guide shaft
X driving gear & pulley
X belt

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
Thread take-up counter weight
Thread take-up lever
Needle bar crank
Needle bar supporter assy
Needle bar crank rod
Needle bar block
Needle bar hook stand
Unit shaft
Needle
Needle bar
Needle bar release lever
Joint
Upper shaft
Pulley
Z zigzag
cam
Z pulse
motor
Z zigzag
lever
Thread take-up
counter weight
Needle bar crank
Needle bar crank rod
Needle bar block
Needle bar
hook stand
Needle bar
Thread take-up lever
Unit shaft Joint
Needle bar
supporter assy
Needle bar
release lever
Z zigzag lever
Upper shaft Pulley
Z zigzag cam Z pulse motor
Needle

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Outline of Mechanism
Outline of
Mechanism
Outline of
Mechanism
Driveline
(B) Movement of feed dog and rotary hook
Timing pulley D
Timing belt
Upper shaft
Upper shaft pulley
Pulley
Lower shaft gear
Lower shaft B
Feed adjuster Joint
Lower shaft A
S pulse motor
Side feed bar
Side feed plate
Feed arm A
Vertical lever
Outer rotary hook
Feed bar
Vertical adjusting screw
Feed dog
Feed arm B
F pulse motor
Lower shaft A
Joint
Vertical lever
Outer rotary hook
Lower shaft gear Lower shaft B
Timing beltTiming pulley D Upper shaft pulley
Feed bar
S pulse motor Side feed plate Side feed bar
F pulse motor
Feed module
Side feed unit
Feed arm A
Vertical adjusting screw
Feed adjuster
Feed arm B
Upper shaft Pulley
Feed dog

1 - 5
Outline of Mechanism
Outline of
Mechanism
Outline of
Mechanism
Positions of electronic components
Main body
Bobbin winder motor
Bobbin winder
speed sensor
Main PCB
Panel PCB
Foot
controller
jack
Head phone
jack
Speaker
Knee lifter variable resistance
Motor drive PCB LCD module /
Touch panel
Main motor
Power
switch
UW (Sensor) pen
connector PCB
Inlet
Power PCB
Side feed pulse motor
Feed dog drop pulse motor
Feed pulse motor sensor PCB
Feed pulse motor
Start/Stop switch PCB
LED PCB (Needle area R)
Button hole
lever switch
Needle plate
switch 2
Lower thread
LED diode PCB
Lower thread
phototransistor
PCB
Needle plate
switch 1
LED PCB (Needle area L)
Button hole switching switch
Zigzag pulse motor sensor PCB
Cloth thickness
variable resistance
Zigzag pulse motor
Presser foot pulse motor sensor PCB
Presser foot pulse motor
Presser foot switch
Variable resistance PCB
Threader switch PCB
Cutter pulse motor
Cutter pulse
motor sensor PCB
Extension IF
PCB (Upper)
Extension IF
PCB (Lower)
Upper thread
sensor PCB
Laser module
Camera relay PCB
Camera module
LED PCB
(Work area)
LED PCB
(Side area)
Threader
pulse motor
Threader pulse motor
sensor PCB
Auto tension pulse motor
sensor PCB
Auto tension pulse motor
Upper unit relay PCB
Needle position sensor PCB
Bobbin winder switch
Embroidery unit connecter