Brother PE770, DZ820E, SB7900E, NV770E, NV750E Service Manual
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1. Outline of Mechanism ........................................................................1 - 1
Main Mechanisms ...........................................................................1 - 2
Driveline ..........................................................................................1 - 3
Positions of electronic components ................................................1 - 4
Control system block diagram .........................................................1 - 5
Operation of other electronic components ......................................1 - 6
2. Disassembly ........................................................................................2 - 1
Main parts ..........................................................................................................2 - 2
Embroidery removal ..........................................................................................................................2 - 3
Top cover removal .............................................................................................................................2 - 3
Face plate removal and disassembly ..................................................................................................2 - 4
Front thread guard cover removal ......................................................................................................2 - 4
Needle plate B removal and disassembly ..........................................................................................2 - 5
Free arm cover removal ....................................................................................................................2 - 5
Front cover removal ..........................................................................................................................2 - 6
Board plate A removal ......................................................................................................................2 - 7
Card cover removal ...........................................................................................................................2 - 7
Main PCB assembly removal ...........................................................................................................2 - 7
Main PCB holder assembly removal .................................................................................................2 - 8
Touch panel assembly removal ..........................................................................................................2 - 8
Indication panel removal ...................................................................................................................2 - 8
Front cover disassembly (bobbin winder guide assembly removal) ..................................................2 - 9
Front cover disassembly (spool pin holder removal) .........................................................................2 - 9
Front cover disassembly (SS-VR PCB assembly removal) .............................................................2 - 10
Front cover disassembly (SV cover removal) ..................................................................................2 - 10
Rear cover removal ..........................................................................................................................2 - 11
Handle removal ................................................................................................................................2 - 11
Electrical parts and motors ..............................................................................2 - 12
Power supply unit F removal ...........................................................................................................2 - 13
PCB Unit LED lamp FL removal ....................................................................................................2 - 13
Base plate sub assy. removal ..........................................................................................................2 - 13
Connector holder assembly removal and disassembly ....................................................................2 - 14
Base plate cover and inlet assembly removal ..................................................................................2 - 14
Base rubber removal ........................................................................................................................2 - 14
Timing belt (motor belt) removal ....................................................................................................2 - 15
Motor fan removal ...........................................................................................................................2 - 15
Main motor assembly removal ........................................................................................................2 - 15
Main motor assembly disassembly ..................................................................................................2 - 16
Coating clip removal ........................................................................................................................2 - 16
Motor PCB assy. removal ................................................................................................................2 - 16
NP PCB assy. removal .....................................................................................................................2 - 17
Belt guard removal ...........................................................................................................................2 - 17
Thread tension mechanism .............................................................................2 - 18
Thread tension assy removal ............................................................................................................2 - 19
Upper thread PCB unit removal .......................................................................................................2 - 19
Upper thread PCB unit disassembly ................................................................................................2 - 19
Thread guide removal ......................................................................................................................2 - 20
Thread guide cover removal ............................................................................................................2 - 20
Tension plate removal ......................................................................................................................2 - 20
i
Thread release holder assy. F removal .............................................................................................2 - 21
PF-F SW assy. removal ...................................................................................................................2 - 21
Thread guide shutter removal ..........................................................................................................2 - 21
Tension releaser link removal ..........................................................................................................2 - 22
Plate assembly removal ...................................................................................................................2 - 22
Thread guide removal ......................................................................................................................2 - 22
Thread tension gear removal ............................................................................................................2 - 22
AT pulse motor removal ..................................................................................................................2 - 23
Tension disk removal .......................................................................................................................2 - 23
Thread take up spring removal ........................................................................................................2 - 23
Thread guide wire removal ..............................................................................................................2 - 24
Bobbin winder mechanism ...............................................................................2 - 25
Bobbin winder cover removal ..........................................................................................................2 - 26
Bobbin base disassembly .................................................................................................................2 - 26
Bobbin presser removal ...................................................................................................................2 - 26
Bobbin winder assembly removal ....................................................................................................2 - 26
BW holder supporter removal ..........................................................................................................2 - 27
BW-F SW assy. removal .................................................................................................................2 - 27
BW shaft holder assembly removal .................................................................................................2 - 27
Bobbin winder shaft stopper removal ..............................................................................................2 - 27
Rotary hook drive mechanism / Feed and bobbin mechanism / Cutter assy. mechanism
Coating clip removal .......................................................................................................................2 - 29
Thread cutter module removal .........................................................................................................2 - 29
Feed module removal ......................................................................................................................2 - 29
Lower shaft A assy. removal ...........................................................................................................2 - 30
Joint removal ....................................................................................................................................2 - 30
Timing pulley D removal .................................................................................................................2 - 30
Lower shaft bushing removal ..........................................................................................................2 - 30
...2 - 28
Needle bar, presser mechanism / Upper shaft mechanism .............................2 - 31
Upper shaft removal .........................................................................................................................2 - 32
Pulley removal .................................................................................................................................2 - 32
Upper shaft pulley removal ..............................................................................................................2 - 32
Tension pulley assembly removal ....................................................................................................2 - 32
Needle-presser module removal ......................................................................................................2 - 33
Plate spring removal ........................................................................................................................2 - 34
Needle-presser module ...................................................................................2 - 35
Quilting foot removal .......................................................................................................................2 - 36
Adjusting plate assy. removal ..........................................................................................................2 - 36
Adjusting plate ASSY disassembly .................................................................................................2 - 36
Guard plate removal .........................................................................................................................2 - 36
Spring removal .................................................................................................................................2 - 37
Lock nut removal .............................................................................................................................2 - 37
Needle bar assy. removal .................................................................................................................2 - 37
Needle bar assy. disassembly ...........................................................................................................2 - 37
Needle holder guide assy. removal ..................................................................................................2 - 38
Lever A spring removal ...................................................................................................................2 - 38
Needle bar supporter assy. removal .................................................................................................2 - 38
Lever AB assy. removal ...................................................................................................................2 - 39
Lever AB assy. disassembly ............................................................................................................2 - 39
Shaft bushing A removal .................................................................................................................2 - 39
Thread guide plate removal .............................................................................................................2 - 40
Hook release plate removal ..............................................................................................................2 - 40
Threader hook assy. disassembly .....................................................................................................2 - 40
ii
Presser foot lifter removal ................................................................................................................2 - 41
Thread take-up assy. removal ..........................................................................................................2 - 41
Thread take-up counter weight removal ..........................................................................................2 - 42
Presser bar removal ..........................................................................................................................2 - 42
Thread take-up lever link removal ...................................................................................................2 - 43
Shaft bushing assembly removal .....................................................................................................2 - 43
Feed module ....................................................................................................2 - 44
Needle plate A removal ...................................................................................................................2 - 45
Needle plate A disassembly .............................................................................................................2 - 45
Inner rotary hook bracket assy. removal ..........................................................................................2 - 45
Cord supporter removal ...................................................................................................................2 - 45
Photo diode holder assembly removal ............................................................................................2 - 46
Photo diode assembly disassembly ..................................................................................................2 - 46
Outer rotary hook assy. removal ......................................................................................................2 - 46
Lower shaft B assy. removal ............................................................................................................2 - 47
Lower shaft B assy. disassembly .....................................................................................................2 - 47
Stopper plate block assy. removal ...................................................................................................2 - 48
Bushing supporter B assy. removal .................................................................................................2 - 48
Bushing presser B removal ..............................................................................................................2 - 48
Thread cutter module .......................................................................................2 - 49
Thread cutter frame assembly removal ...........................................................................................2 - 50
Photo transistor assembly removal ..................................................................................................2 - 50
Presser plate removal .......................................................................................................................2 - 50
Cutter holder assembly removal ......................................................................................................2 - 51
Thread hook assy. disassembly ........................................................................................................2 - 51
Rubber removal ................................................................................................................................2 - 51
Thread cutter lever assy. removal ....................................................................................................2 - 52
Thread cutter lever assy. disassembly ..............................................................................................2 - 52
Idle gear A and idle gear B removal ................................................................................................2 - 52
Pulse motor C removal ....................................................................................................................2 - 52
Embroidery parts .............................................................................................2 - 53
YPM cover removal .........................................................................................................................2 - 54
X carriage cover removal .................................................................................................................2 - 54
ES main cover assembly removal ...................................................................................................2 - 55
Groove cover removal ....................................................................................................................2 - 55
Lead wire assembly (EMB unit FCOMB) removal ........................................................................2 - 56
ES base cover unit removal .............................................................................................................2 - 56
Lock release lever assembly removal .............................................................................................2 - 57
Lock release lever ASSY disassembly ............................................................................................2 - 57
Rubber cushion and rubber cushion cover removal ........................................................................2 - 57
Groove cover removal ....................................................................................................................2 - 58
EMB relay PCB assembly removal ................................................................................................2 - 58
X belt presser removal .....................................................................................................................2 - 58
XY carriage unit removal ................................................................................................................2 - 59
Oil guard plate removal ...................................................................................................................2 - 59
X pulse motor assembly removal .....................................................................................................2 - 59
X tension pulley assembly removal .................................................................................................2 - 60
X tension pulley ASSY disassembly ..............................................................................................2 - 60
X driving gear pulley removal .........................................................................................................2 - 60
X initial shutter removal ..................................................................................................................2 - 61
X slider removal ...............................................................................................................................2 - 61
Cord guide removal .........................................................................................................................2 - 61
Lead wire assembly YPM relay removal .........................................................................................2 - 61
Y slider removal ...............................................................................................................................2 - 62
iii
Y carriage unit removal ...................................................................................................................2 - 62
Y carriage ASSY disassembly .........................................................................................................2 - 63
Y pulse motor assembly removal .....................................................................................................2 - 63
Y tension pulley assembly removal .................................................................................................2 - 64
Y tension pulley ASSY disassembly ...............................................................................................2 - 64
Y driving gear pulley assembly removal .........................................................................................2 - 65
Y sensor PCB assembly removal .....................................................................................................2 - 65
3. Assembly .............................................................................................3 - 1
Needle bar, presser mechanism / upper shaft mechanism ...............................3 - 2
Plate spring attachment ......................................................................................................................3 - 3
Needle-presser module attachment ....................................................................................................3 - 4
Upper shaft pulley attachment ...........................................................................................................3 - 4
Pulley attachment ...............................................................................................................................3 - 5
Upper shaft assy. attachment .............................................................................................................3 - 5
Connecting the needle-presser module and upper shaft ....................................................................3 - 6
Tension pulley assembly attachment .................................................................................................3 - 6
Rotary hook drive mechanism / Feed and bobbin mechanism /Cutter assy. mechanism
Assembling the Lower shaft A assembly ..........................................................................................3 - 8
Timing pulley D attachment ..............................................................................................................3 - 8
Joint attachment .................................................................................................................................3 - 8
Lower shaft A attachment ..................................................................................................................3 - 9
feed module attachment .....................................................................................................................3 - 9
Thread cutter module attachment ....................................................................................................3 - 10
Coating clip attachment ..................................................................................................................3 - 10
...... 3 - 7
Bobbin winder mechanism ...............................................................................3 - 11
Bobbin winder shaft stopper (bobbin winder assembly holder) assembly ......................................3 - 12
BW shaft holder assembly attachment .............................................................................................3 - 12
BW-F SW assy. attachment .............................................................................................................3 - 12
BW holder supporter attachment .....................................................................................................3 - 13
Bobbin winder holder assembly attachment ....................................................................................3 - 13
Bobbin presser assembly .................................................................................................................3 - 13
Bobbin winder cover attachment ..................................................................................................... 3 - 14
Bobbin base assembly ......................................................................................................................3 - 14
Bobbin base attachment ...................................................................................................................3 - 14
Thread tension mechanism .............................................................................3 - 15
Spring tape attachment .....................................................................................................................3 - 16
Thread guide wire attachment ..........................................................................................................3 - 16
Thread take up spring attachment ....................................................................................................3 - 17
Tension disk attachment ..................................................................................................................3 - 18
AT pulse motor attachment ..............................................................................................................3 - 18
Thread tension gear attachment .......................................................................................................3 - 19
Thread guide attachment ..................................................................................................................3 - 19
Plate assembly attachment ...............................................................................................................3 - 19
Tension releaser link attachment .....................................................................................................3 - 20
Thread guide shutter assembly ........................................................................................................3 - 20
PF-F SW assy. assembly ..................................................................................................................3 - 20
Thread release holder assy. attachment ...........................................................................................3 - 21
Upper thread PCB unit assembly .................................................................................................... 3 - 21
Upper thread PCB unit attachment ..................................................................................................3 - 21
Tension plate attachment .................................................................................................................3 - 22
Thread guide cover attachment ........................................................................................................3 - 22
Thread guide cover assembly ..........................................................................................................3 - 23
iv
Thread tension assy. attachment ......................................................................................................3 - 23
Electrical parts and motors ..............................................................................3 - 24
Belt guard attachment .....................................................................................................................3 - 25
NP PCB assy. attachment ................................................................................................................3 - 25
Motor PCB assy. attachment ...........................................................................................................3 - 25
Assembly of main motor assembly .................................................................................................3 - 25
Main motor assembly attachment ....................................................................................................3 - 26
Motor fan attachment .......................................................................................................................3 - 26
Base plate rubber attachment ...........................................................................................................3 - 26
Inlet assy. and base plate cover attachment .....................................................................................3 - 26
Connector holder ASSY assembly and attachment ........................................................................3 - 27
Base plate attachment ......................................................................................................................3 - 27
Power supply unit F attachment .......................................................................................................3 - 27
PBC unit LED lamp-FL attachment ................................................................................................3 - 28
Wire clip attachment ........................................................................................................................3 - 28
Cord treatment .................................................................................................................................3 - 28
Main parts ........................................................................................................3 - 29
Handle assembly and attachment .....................................................................................................3 - 30
Rear cover attachment .....................................................................................................................3 - 30
Front cover assembly (SV cover attachment) ..................................................................................3 - 31
Front cover assembly (SS-VR F PCB assy. attachment) .................................................................3 - 31
Front cover assembly (spool pin attachment) ..................................................................................3 - 32
Front cover assembly (assembling bobbin winder guide assembly) ..............................................3 - 32
Indication panel attachment .............................................................................................................3 - 32
Touch panel assembly attachment ...................................................................................................3 - 33
Main PCB holder assembly attachment ...........................................................................................3 - 33
Main PCB assembly attachment ......................................................................................................3 - 34
Card cover attachment .....................................................................................................................3 - 34
Board plate A attachment ................................................................................................................3 - 34
Front cover attachment ....................................................................................................................3 - 35
Free arm cover attachment ...............................................................................................................3 - 36
Front thread guide cover attachment ...............................................................................................3 - 36
Assembling needle plate B assy .......................................................................................................3 - 36
Needle plate B assy. attachment ......................................................................................................3 - 36
Face plate assembly .........................................................................................................................3 - 37
Face plate assy. attachment ..............................................................................................................3 - 37
Top cover attachment .......................................................................................................................3 - 37
Embroidery attachment ....................................................................................................................3 - 38
Needle-presser module ...................................................................................3 - 39
Shaft bushing assembly attachment .................................................................................................3 - 40
Thread take-up lever link assembly .................................................................................................3 - 40
Presser bar attachment .....................................................................................................................3 - 41
Thread take-up counter weight attachment ......................................................................................3 - 42
Thread take-up lever assy. attachment .............................................................................................3 - 43
Presser foot lifter attachment ...........................................................................................................3 - 44
Threader hook assy. attachment .......................................................................................................3 - 45
Hook release plate attachment .........................................................................................................3 - 45
Thread guide plate attachment .........................................................................................................3 - 46
Shaft bushing A attachment .............................................................................................................3 - 46
Assembling the Lever AB assy ........................................................................................................3 - 46
Lever AB assy. attachment ..............................................................................................................3 - 47
Needle bar supporter assy. attachment ............................................................................................3 - 47
Lever A spring attachment ...............................................................................................................3 - 48
Needle holder guide assy attachment ...............................................................................................3 - 48
v
Needle bar assembly ........................................................................................................................3 - 48
Needle bar assembly attachment ......................................................................................................3 - 49
Lock nut attachment .........................................................................................................................3 - 49
Spring (for needle bar supporter assy.) attachment .........................................................................3 - 50
Gurd plate attachment .....................................................................................................................3 - 50
Adjusting plate ASSY assembly .....................................................................................................3 - 50
Adjusting plate assy. attachment .....................................................................................................3 - 50
Quiltintg foot attachment .................................................................................................................3 - 51
Feed module ....................................................................................................3 - 52
Bushing supporter assy. assembly ...................................................................................................3 - 53
Bushing support assy. attachment ....................................................................................................3 - 53
Stopper plate block assy. attachment ...............................................................................................3 - 53
Assembling the lower shaft B assy ..................................................................................................3 - 54
Lower shaft B assy. attachment .......................................................................................................3 - 55
Outer rotary hook assy. attachment .................................................................................................3 - 56
Photo diode holder ASSY assembly ...............................................................................................3 - 56
Photo diode holder assembly attachment .........................................................................................3 - 56
Cord holder attachment ....................................................................................................................3 - 57
Inner rotary hook bracket assy. attachment .....................................................................................3 - 57
Needle plate A ASSY assembly ......................................................................................................3 - 57
Needle plate A assy. attachment ......................................................................................................3 - 58
Thread cutter module .......................................................................................3 - 59
C pulse motor attachment ................................................................................................................3 - 60
Idle gears A and B attachment .........................................................................................................3 - 60
Assembling the thread cutter lever assy ..........................................................................................3 - 61
Thread cutter lever assy. attachment ................................................................................................3 - 61
Rubber and spacer attachment .........................................................................................................3 - 61
Assembling the thread hook assy .....................................................................................................3 - 62
Cutter holder assembly attachment ..................................................................................................3 - 62
Presser plate assy. attachment ..........................................................................................................3 - 62
Sensor holder attachment .................................................................................................................3 - 63
Thread cutter check ..........................................................................................................................3 - 63
Grease applications ..........................................................................................................................3 - 63
Thread cutter frame assembly attachment .......................................................................................3 - 64
CPM lead processing .......................................................................................................................3 - 64
vi
Embroidery parts .............................................................................................3 - 65
Y sensor PCB assembly attachment ...............................................................................................3 - 66
Y driving gear pulley assembly attachment ....................................................................................3 - 66
Y tension pulley assembly attachment .............................................................................................3 - 67
Y tension pulley assembly attachment .............................................................................................3 - 67
Y pulse motor assembly attachment ................................................................................................3 - 68
Y carriage ASSY assembly .............................................................................................................3 - 68
Y carriage unit attachment ...............................................................................................................3 - 69
Y slider attachment ..........................................................................................................................3 - 69
Lead wire assembly YPM relay attachment ....................................................................................3 - 69
Cord guide attachment .....................................................................................................................3 - 70
X slider attachment ..........................................................................................................................3 - 70
X initial shutter attachment .............................................................................................................3 - 70
X driving gear pulley attachment .....................................................................................................3 - 71
X tension pulley ASSY assembly ....................................................................................................3 - 71
X tension pulley ASSY attachment ................................................................................................3 - 72
X pulse motor assembly attachment ...............................................................................................3 - 72
Oil guard plate attachment ...............................................................................................................3 - 73
XY carriage unit removal ................................................................................................................3 - 73
X belt presser removal .....................................................................................................................3 - 74
EMB relay PCB assembly attachment .............................................................................................3 - 74
Groove cover attachment .................................................................................................................3 - 74
Rubber cushion and rubber cushion cover attachment ....................................................................3 - 75
Lock release lever ASSY assembly ................................................................................................3 - 75
Lock release lever assembly attachment ..........................................................................................3 - 75
ES base cover unit attachment ........................................................................................................3 - 76
Lead wire assembly (EMB unit FCOMB) attachment ...................................................................3 - 76
Groove cover attachment .................................................................................................................3 - 77
ES main cover assembly attachment ...............................................................................................3 - 77
X carriage cover attachment ............................................................................................................3 - 78
YPM cover attachment ....................................................................................................................3 - 78
4. Adjustment ..........................................................................................4 - 1
Needle point damage .........................................................................................4 - 2
Starting test mode ..............................................................................................4 - 3
List of the Test Mode .........................................................................................4 - 4
Touch panel .......................................................................................................4 - 5
Timing belt tension .............................................................................................4 - 6
Motor belt tension ..............................................................................................4 - 7
Fine tension .......................................................................................................4 - 8
Upper thread tension .........................................................................................4 - 9
Needle left/right position ..................................................................................4 - 10
Needle bar rising ..............................................................................................4 - 11
Needle bar height ............................................................................................4 - 12
Clearance between needle and rotary hook point ...........................................4 - 13
Needle threader ...............................................................................................4 - 14
Presser bar height ...........................................................................................4 - 15
Bobbin winder ..................................................................................................4 - 16
Needle and presser foot front/back position ....................................................4 - 17
Inner rotary hook bracket position ...................................................................4 - 18
Inner rotary hook assy. (lower thread) tension ................................................4 - 19
Belt tension (embroidery unit) ..........................................................................4 - 20
Embroidery unit center position .......................................................................4 - 21
vii
5. Failure Investigation for Electronic Parts .........................................5 - 1
Error message list ..............................................................................................5 - 2
The power does not come on ............................................................................5 - 3
Pulse motors do not return to starting position ..................................................5 - 5
The touch panel does not work ..........................................................................5 - 6
LCD backlight does not come on .......................................................................5 - 7
Main motor does not turn ...................................................................................5 - 8
Main motor rotation abnormal ..........................................................................5 - 10
Cannot sew pattern correctly ...........................................................................5 - 11
Thread tensioning is not correct ......................................................................5 - 12
Thread cutter does not work normally .............................................................5 - 13
Bobbin winding cannot be done .......................................................................5 - 14
Lamp does not come on ..................................................................................5 - 15
Bobbin thread detection does not work normally .............................................5 - 17
Upper thread sensor does not work normally ..................................................5 - 18
Card cannot be used normally .........................................................................5 - 19
Embroidery unit does not operate normally .....................................................5 - 21
Error is displayed .............................................................................................5 - 24
Replacement of main PCB assy or motor PCB assy .......................................5 - 27
Correspondence table of “Model” and “Printed-circuit board” ..........................5 - 28
6. Repair Manual .....................................................................................6 - 1
7. Special Instructions of Wiring ...........................................................7 - 1
Needle bar module wiring ..................................................................................7 - 2
Rotary hook module wiring ................................................................................7 - 5
Motor PCB assembly wiring ...............................................................................7 - 6
Front cover assembly wiring ..............................................................................7 - 9
Embroidary unit assembly wiring .....................................................................7 - 10
viii
1
Outline of Mechanism
Main Mechanisms .................................................... 1 - 2
Driveline .................................................................... 1 - 3
Positions of electronic components........................... 1 - 4
Control system block diagram................................... 1 - 5
Operation of other electronic components ................ 1 - 6
1 - 1
Outline of Mechanism Main Mechanisms
Sewing machine
Needle ber /
Presser foot mechanism
Thread tension mechanism
Bobbin winder mechanism
Upper shaft
mechanism
Thread cutting
mechanism
Embroidery unit
Y belt
Y senser PCB
Y driving gear
Rotary hook mechanism
Y guide shaft
Y pulse motor
Lower shaft mechanism
X guide shaft
X belt
X driving gear
X senser PCB
X pulse motor
1 - 2
Outline of Mechanism Driveline
A) Up and down movement of needle bar, movement of thread take-up lever and zigzag
mechanism
Thread take-up
counter weight
Needle bar crank
Needle bar crank rod
Needle bar block
Needle bar
Needle
Needle bar supporter assy
Needle bar release lever
Unit shaft Joint Upper shaft Pulley
Thread take-up lever
Needle bar supporter
assy
Needle bar
Needle
Needle bar crank
Joint
Upper shaft
Unit shaft
Thread take-up counter weight
Needle bar crank rod
Needle bar block
Needle bar hook stand
Pulley
Outline of
Mechanism
B) Rotation of outer rotary hook
Timing pulley D Timing belt
Lower shaft A
Joint
Lower shaft B assy
Lower shaft gear
Outer rotary hook
Outer rotary hook
Lower shaft gear
Upper shaft
pulley
Upper shaft Pulley
Upper shaft
Lower shaft A
Joint
Upper shaft
pulley
Timing belt
Timing pulley D
Pulley
1 - 3
Outline of Mechanism Positions of electronic components
Upper thread sensor PCB
SS PCB
BW SW
Power supply unit
LED LAMP-FL
PF SW
AT pulse motor
NP PCB
LCD unit / Touch pannel
Main motor
Power SW
LED LAMP-FR
C pulse motor
Photo transistor PCB
(Bobbin thread sensor)
Motor PCB
Main PCB
Inlet
Embroidery unit connector
Photo diode PCB
(Bobbin thread sensor)
1 - 4
Outline of Mechanism Control system block diagram
Power Supply PCB
Switching power supply
Main motor drive circuit
Upper thread sensor
Bobbin thread sensor
Photo diode
Photo transistor
Machine
+26V
+5V
Inlet
Main motor
Motor PCB
EEPROM
8Kbit
FFC
AC cord
LED lamp L
PM driver
MTD2033G
x4
NP PCB
NP sensor x3
Speed sensor
BWSW
PFSW
C pulse motor
AT pulse motor
Outline of
Mechanism
Front cover
(USB memory)
SSVR PCB
SSSW
NPSW
ATCSW
LED lamp R
Two-color
LED
Main PCB
3.3V REG
USB driver
SDRAM
16Mbit
FLASH
32Mbit
Back light
LED x2
1.8V REG
RESET IC
FPC
LCD
module
Touch panel
FPC
EEPROM
8Kbit
CPU
5V 3.3V
BUFFER
Embroidery attachment
EMB RERAY PCB
X sensor
X pulse motor
Embroidery card
Y sensor
Y pulse motor
1 - 5
Outline of Mechanism Operation of other electronic components
Start/Stop (SS) button. . . . . . . . . . . . . . . . . . Button for starting and stopping the sewing machine. The
machine operates at a slow speed while the button is being held
down.
Thread cutter button . . . . . . . . . . . . . . . . . . . This button is for cutting the thread. In case the button is
pressed, the thread is cut regardless of the needle position and
stop with the needle up.
Touch Panel . . . . . . . . . . . . . . . . . . . . . . . . . Used to select pattern and input test mode number required for
sewing by simply touching the display on the panel. This
simplifies the oparation for selecting the desired pattern and
number.
Needle position (NP) sensor. . . . . . . . . . . . . This sensor detects the drive timing of each pulse motor and the
vertical stop of the needle position. It detects the upper shaft
angle of rotation by using a shutter attached to the upper shaft
and an opitical sensor.
Speed sensor. . . . . . . . . . . . . . . . . . . . . . . . . This sensor detects the rotational speed of the main motor. It
detects the upper shaft rotational speed by using a shutter
attached to the upper shaft and an optical sensor.
PF (Presser foot) switch . . . . . . . . . . . . . . . . This switch detects the vertical position of the presser foot lever.
BW (bobbin winder) switch . . . . . . . . . . . . . This switch detects whether the bobbin is set for winding or not,
when the bobbin thread is wound.
LED lamp . . . . . . . . . . . . . . . . . . . . . . . . . . . White LED lamps for illuminating the work space.
Up thread sensor. . . . . . . . . . . . . . . . . . . . . . Detects the presence or absence of the upper thread and
whetherit is cut or not.
Photo diode, photo transistor . . . . . . . . . . . . This assy detects the bobbin thread is low.
X sensor,
Y sensor (Embroidery unit) . . . . . . . . . . . . . This sensor detects the original position of X pulse motor and Y
pulse motor.
1 - 6
2
Disassembly
Main unit Main parts........................................ 2 - 2
Electrical parts and motors ............ 2 - 12
Thread tension mechanism ........... 2 - 18
Bobbin winder mechanism ............ 2 - 25
Rotary hook drive mechanism /
Feed and bobbin mechanism /
Cutter assy. location diagram ........ 2 - 28
Needle bar, presser mechanism /
Upper shaft mechanism................. 2 - 31
Modules Needle-presser module ................. 2 - 35
Feed module.................................. 2 - 44
Thread cutter module .................... 2 - 49
Embroidery Embroidery parts ........................... 2 - 53
2 - 1
Main unit
Main parts location diagram
2 - 2
Main unit
1 Embroidery removal
1. Remove the enbroidery 1.
*Key point
• Move the lock lever 2 of the back, and then remove the
embroidery 1.
Main parts
1
Disassembly
2 Top cover removal
1. Remove top cover 1.
*Key point
• Push the attached part toward the inside and remove.
2
1
2 - 3
Main unit
Main parts
3 Face plate removal and disassembly
1. Remove the screw 1, and then remove the face plate assembly 1.
2. Remove the needle thread lever knob 2.
3. Remove the screw 2, and then remove the face plate cutter holder 3 and
the NT lower thread cutter 4.
4. Remove the screws 3 and 4, and then remove the shaft presser plate 5
and the plain washer 6.
5. Remove the spring .
6. Remove the needle thread lever shaft 7.
7. Remove the needle thread lever 8 and the rubber washer 9 from the
needle thread lever shaft 7.
S01
S01
1
5
9
8
2
1
4 Front thread guard cover removal
1. Remove the screw 1, and remove the front thread guard cover 1.
63
7
342
4
11
2 - 4
Main unit
Main parts
5 Needle plate B removal and disassembly
1. Remove the needle plate cover 1.
2. Remove the needle plate B 2.
3. Remove the cutter cover 3.
4. Remove the spring plate 4 from the cutter cover 3, and remove the NT
lower thread cutter 6.
5. Undo the slide button hook (two locations), and remove the slide button
5.
6 Free arm cover removal
1. Remove the screw 1, and then remove the free arm cover 1.
1
2
Disassembly
3
4
1
56
1
2 - 5
Main unit
Main parts
7 Front cover removal
1. Remove the screw 1 and the 3 screws 2.
2. Remove the hook 1 on the front cover, and then remove the hook 2 by
pushing the hook attachment section 2 on the rear cover.
*Key point
• Be careful not to damage the hooks 1 and 2 on the front
cover.
3. Remove the 2 bottom hooks 3 from the base plate while sliding the front
cover to the right.
4. Remove the flat cable 4 and the connector 5 from the main PCB
assembly, and then remove the front cover.
*Key point
• Move the lock of the connector 5 on the main PCB to the
upright position to release it, and then pull out the flat cable 4.
1
2
1
3
2
4
2 - 6
5
Main unit
Main parts
8 Board plate A removal
1. Remove the 2 screws 1, and then remove the board plate A 1.
9 Card cover removal
1. Remove the screw 1, and then remove the card cover 1.
*Key point
• Press the 2 hooks on the card cover 1 from the inside of the
front cover.
1
1
Disassembly
1
10 Main PCB assembly removal
1. Remove the 3 connectors from the main PCB 1, and then disconnect the 3
FFC cords.
*Key point
• Pull up the lock of the connector on the main PCB 1 to
release it, and then disconnect the FFC cord 2.
• Move the lock of the connector on the main PCB to the upright
position to release it, and then disconnect the FFC cord 3.
2. Remove the 4 screws 1, and then remove the main PCB 1 and the board
plate B 4.
1
32
1
1
4
2 - 7
Main unit
Main parts
11 Main PCB holder assembly removal
1. Remove the 8 screws 1, and then remove the main PCB holder assembly
1.
2. Remove the 2 hooks on the main PCB holder assembly 1, and then
remove the light plate assembly 2.
1
1 1
2
12 Touch panel assembly removal
1. Remove the touch panel assembly 1 from the front cover.
13 Indication panel removal
1. Remove the 4 hooks 1 from the backside of the front cover, and then
remove the indication panel 2.
1
1
2
1
2 - 8
1
Main unit
Main parts
14 Front cover disassembly
(bobbin winder guide assembly removal)
1. Remove the screw 1, and remove the bobbin winder guide assembly 1.
15 Front cover disassembly (spool pin holder removal)
1. Remove the screws 1 and 2, and then remove the thread bobbin cover
1, spool pin holder assembly 2, and spool pin 3.
1
1
Disassembly
1
2
1
2
1
3
2 - 9
Main unit
Main parts
16 Front cover disassembly (SS-VR PCB assembly removal)
1. Remove the screw 1, and then remove the lamp holder supporter 1.
2. Remove the 4 screws 2, and then remove the insulation sheet 2 and the
SS-VR PCB assembly 3.
3. Remove the connector of the PCB unit LED lamp (FR).
4. Remove the reverse button 4, SS button 5, and thread cut button 6.
2
3
112
4
17 Front cover disassembly (SV cover removal)
1. Remove the SV cover 1.
*Key point
• Press the 2 hooks 2 on the SV cover 1 from the inside of the
front cover.
65
1
2 - 10
2
Main unit
Main parts
18 Rear cover removal
1. Remove the screw 1.
2. Lower the presser lever 1, and then remove section 2, being careful to
prevent the presser lever 1 being caught in section 2.
3. Remove section 3, being careful to prevent the switch 4 of the power
supply unit being caught in section 3.
4. Remove the hook 5, and then remove the rear cover.
19 Handle removal
1. Remove the 2 screws 1, and remove the handle 1.
2. Remove the 2 retaining rings E4 from the handle shafts, and remove the
handle 1, the 2 handle shafts and the 2 polyester sliders from the handle
holder.
5
1
1
2 1
3
4
1
Disassembly
Retaining rings E4
1
2 - 11
Main unit
Electrical parts and motors location diagram
2 - 12
Main unit
Electrical parts and motors
1 Power supply unit F removal
1. Unplug all of the connectors on the motor PCB assy. 1.
2. Remove the main motor connector 2.
3. Disconnect the connector 3 of the inlet assembly lead wire.
4. Remove the 3 screws 1, and remove the power supply unit F 4.
1
4
2
Disassembly
2 PCB Unit LED lamp FL removal
1. Disconnect the bands on the back of the arm bed.
2. Remove the screw 1, and remove the PCB unit LED lamp FL 1.
3 Base plate sub assy. removal
1. Remove the 3 screws 1, and remove the base plate sub assy. 1.
1
1
3
1
1 1
2 - 13
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