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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
Accessory table removal ................................................................................................................... 2 - 3
Base cover removal ........................................................................................................................... 2 - 3
Needle plate B assy. removal ............................................................................................................ 2 - 4
Needle plate B assy. disassembly ................................................................................................ 2 - 4
Face plate assy. removal ................................................................................................................... 2 - 5
Face plate A assy. disassembly .................................................................................................. 2 - 5
Front cover assy. removal ................................................................................................................. 2 - 6
Thread guide assy. A removal .......................................................................................................... 2 - 7
Thread guide assy. A disassembly ............................................................................................. 2 - 7
Thread guide assy. B removal ........................................................................................................... 2 - 8
SSVR PCB assy. removal ................................................................................................................. 2 - 9
Buttons removal ................................................................................................................................ 2 - 9
LED lamp removal ............................................................................................................................ 2 - 9
Operation PCB assy. removal ......................................................................................................... 2 - 10
Selecting and manual buttons removal ........................................................................................... 2 - 10
Single light guide assy. removal ..................................................................................................... 2 - 10
Mode select PCB assy. removal ..................................................................................................... 2 - 10
SV keytop removal ......................................................................................................................... 2 - 11
Panel cover assy. removal .............................................................................................................. 2 - 12
Panel cover assy. disassembly ................................................................................................... 2 - 12
Base plate rubber removal .............................................................................................................. 2 - 13
Upper cover thread guide removal .................................................................................................. 2 - 13
Main PCB assy. removal ................................................................................................................ 2 - 13
Power PCB assy. removal ............................................................................................................... 2 - 14
Power PCB assy. disassembly .................................................................................................. 2 - 14
Inlet assy. removal .......................................................................................................................... 2 - 14
FC jack removal .............................................................................................................................. 2 - 15
Main motor assy. removal .............................................................................................................. 2 - 15
Main motor assy. disassembly ................................................................................................. 2 - 15
Tension pulley assy. removal .......................................................................................................... 2 - 16
Tension pulley assy. disassembly ............................................................................................. 2 - 16
Spring removal ................................................................................................................................ 2 - 16
Feed unit assy. removal ................................................................................................................. 2 - 17
Upper shaft assy. removal ............................................................................................................... 2 - 17
Needle-presser unit removal ........................................................................................................... 2 - 18
Plate spring removal ....................................................................................................................... 2 - 18
Bobbin base assy. removal .............................................................................................................. 2 - 19
Bobbin base assy. disassembly ................................................................................................. 2 - 19
Bobbin winder assy. removal .......................................................................................................... 2 - 19
Spool pin removal ........................................................................................................................... 2 - 20
Bobbin presser removal .................................................................................................................. 2 - 20
Thread guide assy. removal ............................................................................................................ 2 - 20
Base plate rubber removal .............................................................................................................. 2 - 21
i
Feed unit ......................................................................................................... 2 - 22
Needle plate A assy. removal ......................................................................................................... 2 - 23
Needle plate A assy. disassembly ............................................................................................ 2 - 23
Spring removal ................................................................................................................................ 2 - 23
Inner rotary hook bracket assy. removal ......................................................................................... 2 - 23
Feed dog removal ............................................................................................................................ 2 - 24
Vertical adjuster screw assy. removal ............................................................................................. 2 - 24
Outer rotary hook removal .............................................................................................................. 2 - 24
Shaft supporter removal .................................................................................................................. 2 - 24
Feed bar removal ............................................................................................................................ 2 - 25
Needle plate supporter shaft B removal .......................................................................................... 2 - 25
Feed arm A assy. removal ............................................................................................................... 2 - 26
Feed arm B assy. disassembly .................................................................................................. 2 - 26
Feed adjuster assy. removal ............................................................................................................ 2 - 27
Feed adjuster disassembly ........................................................................................................ 2 - 27
Vertical lever removal .................................................................................................................... 2 - 27
FPM holder assy. removal .............................................................................................................. 2 - 28
FPM disassembly ...................................................................................................................... 2 - 28
Timing pulley D removal ................................................................................................................ 2 - 28
Lower shaft assy. removal .............................................................................................................. 2 - 29
Lower shaft bushing removal ......................................................................................................... 2 - 29
Needle-presser unit ........................................................................................ 2 - 30
Thread slider guide removal ........................................................................................................... 2 - 31
Bands removal ................................................................................................................................ 2 - 31
Threader hook assy. removal .......................................................................................................... 2 - 31
Lead wire assy. removal ................................................................................................................. 2 - 31
BH switch assy. removal ................................................................................................................ 2 - 32
Thread take-up lever and needle bar crank removal ....................................................................... 2 - 32
Thread take-up lever link removal .................................................................................................. 2 - 32
Needle bar assy. removal ................................................................................................................ 2 - 33
Needle bar assy. disassembly .................................................................................................... 2 - 33
Needle holder assy. removal ........................................................................................................... 2 - 34
Needle holder assy. disassembly ............................................................................................... 2 - 35
Presser bar removal ......................................................................................................................... 2 - 36
Z zigzag lever assy. removal ........................................................................................................... 2 - 36
Z zigzag lever disassembly ...................................................................................................... 2 - 37
Z zigzag cam removal ..................................................................................................................... 2 - 37
Shaft bushing removal .................................................................................................................... 2 - 37
Presser foot lifter removal ............................................................................................................... 2 - 37
Thread release lever removal .......................................................................................................... 2 - 38
Lock nut removal ............................................................................................................................ 2 - 38
Z pulse motor removal .................................................................................................................... 2 - 38
Presser switch assy. removal .......................................................................................................... 2 - 38
3. Assembly ............................................................................................ 3 - 1
Main parts ......................................................................................................... 3 - 2
Base plate rubber attachment ............................................................................................................ 3-3
Thread guide assy. attachment .......................................................................................................... 3-3
Bobbin presser attachment ................................................................................................................ 3-3
Spool pin attachment ........................................................................................................................ 3-4
Bobbin winder assy. attachment ....................................................................................................... 3-5
Bobbin base assy. attachment ........................................................................................................... 3-6
Bobbin base assy. assembly ........................................................................................................ 3-6
Plate spring attachment ..................................................................................................................... 3-6
ii
Needle-presser unit attachment ......................................................................................................... 3 - 7
Upper shaft assy. attachment ............................................................................................................ 3 - 8
Feed unit assy. attachment ................................................................................................................ 3 - 9
Spring attachment ............................................................................................................................. 3 - 9
Upper shaft and lower shaft phase matching .................................................................................. 3 - 10
Tension pulley assy. attachment ..................................................................................................... 3 - 10
Tension pulley assy. assembly ................................................................................................. 3 - 10
Main motor assy. attachment .......................................................................................................... 3 - 11
Main motor assembly ................................................................................................................ 3 - 11
FC jack attachment ......................................................................................................................... 3 - 11
Inlet assy. attachment ...................................................................................................................... 3 - 11
Power PCB assy. attachment .......................................................................................................... 3 - 12
Power PCB assy. assembly ...................................................................................................... 3 - 12
Main PCB assy. attachment ............................................................................................................ 3 - 13
Upper cover thread guide attachment ............................................................................................. 3 - 13
Base plate rubber attachment .......................................................................................................... 3 - 13
Panel cover assy. attachment .......................................................................................................... 3 - 14
Panel cover assy. assembly ....................................................................................................... 3 - 14
SV keytop attachment ..................................................................................................................... 3 - 15
Mode select PCB assy. attachment ................................................................................................. 3 - 15
Single light guide assy. attachment ................................................................................................. 3 - 15
Selecting and manual buttons attachment ....................................................................................... 3 - 16
Operation PCB assy. attachment .................................................................................................... 3 - 16
LED lamp attachment ..................................................................................................................... 3 - 16
Buttons attachment ......................................................................................................................... 3 - 17
SSVR PCB assy. attachment .......................................................................................................... 3 - 18
Thread guide assy. B attachment .................................................................................................... 3 - 18
Thread guide assy. B assembly ................................................................................................. 3 - 19
Thread guide assy. A attachment .................................................................................................... 3 - 20
Thread guide assy. A assembly ................................................................................................ 3 - 20
Front cover assy. attachment .......................................................................................................... 3 - 21
Face plate A assy. attachment ......................................................................................................... 3 - 22
Face plate A assy. assembly ..................................................................................................... 3 - 22
Needle plate B assy. attachment ..................................................................................................... 3 - 23
Needle plate B assy. assembly .................................................................................................. 3 - 23
Base cover attachment .................................................................................................................... 3 - 23
Accessory table attachment ............................................................................................................ 3 - 24
Feed unit ......................................................................................................... 3 - 25
Lower shaft bushing attachment ..................................................................................................... 3 - 26
Lower shaft assy. attachment .......................................................................................................... 3 - 26
Timing pulley D attachment ........................................................................................................... 3 - 26
FPM holder assy. attachment .......................................................................................................... 3 - 27
FPM assembly .......................................................................................................................... 3 - 27
Vertical lever attachment ................................................................................................................ 3 - 28
Feed adjuster assy. attachment ........................................................................................................ 3 - 29
Feed adjuster assy. assembly ..................................................................................................... 3 - 29
Feed arm A assy. attachment .......................................................................................................... 3 - 30
Feed arm B assy. assembly ....................................................................................................... 3 - 31
Needle plate supporter shaft B attachment ..................................................................................... 3 - 32
FPM gear engagement .................................................................................................................... 3 - 33
Feed bar attachment ........................................................................................................................ 3 - 34
Shaft supporter attachment ............................................................................................................. 3 - 34
Outer rotary hook attachment ......................................................................................................... 3 - 34
Vertical adjuster screw assy. attachment ........................................................................................ 3 - 35
Feed dog attachment ....................................................................................................................... 3 - 35
Inner rotary hook bracket assy. attachment .................................................................................... 3 - 35
iii
Spring attachment ........................................................................................................................... 3 - 35
Needle plate A assy. attachment ..................................................................................................... 3 - 36
Needle plate A ASSY assembly ............................................................................................... 3 - 36
Needle-presser unit ........................................................................................ 3 - 37
Presser switch assy. attachment ...................................................................................................... 3 - 38
Z pulse motor attachment ............................................................................................................... 3 - 38
Lock nut attachment ........................................................................................................................ 3 - 39
Thread release lever attachment ..................................................................................................... 3 - 39
Presser foot lifter attachment .......................................................................................................... 3 - 40
Shaft bushing attachment ................................................................................................................ 3 - 40
Z zigzag cam attachment ................................................................................................................ 3 - 41
Z zigzag lever assy. attachment ...................................................................................................... 3 - 42
Z zigzag lever assy. assembly .................................................................................................. 3 - 42
Presser bar attachment .................................................................................................................... 3 - 43
Needle holder assy. attachment ..................................................................................................... 3 - 44
Needle holder assy. assembly .................................................................................................. 3 - 45
Needle bar assy. attachment ............................................................................................................ 3 - 46
Needle bar assy. assembly ......................................................................................................... 3 - 46
Thread take-up lever link attachment ............................................................................................. 3 - 46
Thread take-up lever and needle bar crank attachment .................................................................. 3 - 47
BH switch assy. attachment ............................................................................................................ 3 - 47
Lead wire assy. assembly ................................................................................................................ 3 - 48
Threader hook assy. attachment ...................................................................................................... 3 - 48
Bands attachment ............................................................................................................................ 3 - 48
Thread slider guide attachment ....................................................................................................... 3 - 48
4. Adjustment ......................................................................................... 4 - 1
Starting test mode/Starting and stopping operation .......................................... 4 - 2
Timing belt tension ............................................................................................ 4 - 3
Motor belt tension ............................................................................................. 4 - 4
Upper thread tension ........................................................................................ 4 - 5
Left base line needle drop ................................................................................ 4 - 6
Rotary hook unit position .................................................................................. 4 - 7
Needle clearance left/right ................................................................................ 4 - 8
Needle bar rising ............................................................................................... 4 - 9
Needle bar height ........................................................................................... 4 - 10
Clearance between needle and rotary hook point .......................................... 4 - 11
Needle threader .............................................................................................. 4 - 12
Presser bar height and parallelism ................................................................. 4 - 13
Forward/backward feed .................................................................................. 4 - 14
Bobbin winder ................................................................................................. 4 - 15
BH lever switch position .................................................................................. 4 - 16
Needle and presser foot front/back position ................................................... 4 - 17
Front/back and left/right position of feed dog .................................................. 4 - 18
Feed dog height .............................................................................................. 4 - 19
iv
Inner rotary hook bracket position .................................................................. 4 - 20
Inner rotary hook assy. (lower thread) tension ............................................... 4 - 21
Pattern ............................................................................................................ 4 - 22
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 starting position ................................................. 5 - 4
Pattern cannot be selected ............................................................................... 5 - 5
Main motor does not turn .................................................................................. 5 - 6
Cannot sew pattern correctly ............................................................................ 5 - 9
Cannot sew button hole correctly ................................................................... 5 - 10
Problems with vertical needle movement and reverse stitching ..................... 5 - 11
Does not operate when the foot controller is used ......................................... 5 - 12
Bobbin winding cannot be done ...................................................................... 5 - 13
LED lamp does not come on .......................................................................... 5 - 14
LCD display is not normal ............................................................................... 5 - 15
Buzzer does not sound ................................................................................... 5 - 16
Error is displayed ............................................................................................ 5 - 17
6. Repair Manual .................................................................................... 6 - 1
7. Special Instructions of Wiring .......................................................... 7 - 1
Needle bar / Presser module wiring .................................................................. 7 - 2
Power supply unit wiring ................................................................................... 7 - 6
Front cover wiring ............................................................................................. 7 - 9
v
vi
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
Bobbin winder mechanism
Thread tension mechanism
Needle bar /
Presser foot mechanism
Upper shaft
mechanism
Lower shaft mechanism
Feed / Rotary hook mechanism
1-2
Outline of Mechanism Driveline
A) Up and down movement of needle bar, movement of thread take-up lever and zigzag mechanism
Mechanism
Outline of
Thread take-up Upper shaft Pulley
counter weight
Needle bar crank Thread take-up lever
Needle bar crank rod
Needle bar block
Needle bar Needle bar supporter Z zigzag lever Z zigzag cam Z pulse motor
assy
Needle
Needle bar crank Upper shaft
Needle bar supporter assy
Z zigzag cam
Z pulse motor
Z zigzag lever
Pulley
Thread take-up counter weight
Needle bar Needle bar crank rod
Needle bar block
Needle
B) Movement of feed dog and rotary hook
Upper shaft
Timing pulley D Timing belt pulley Upper shaft Pulley
Feed module
Lower shaft
gear Lower shaft Feed adjuster F pulse motor
Outer rotary Feed arm b
hook assy Feed arm A
Vertical
Vertical lever adjusting screw Feed bar Feed dog
Pulley
Upper shaft pulley
Upper shaft
Feed dog
Vertical adjusting screw
F pulse motor Timing belt
Feed bar
Timing pulley D
Feed arm A Lower shaft
Outer rotary hook
Lower shaft gear Feed arm b assy
1-3
Outline of Mechanism Positions of electronic components
Front cover side
Mode selection PCB LCD module
SS-VR PCB Operation PCB
LED lamp
Machine (rear cover) side
BW switch
Z pulse motor PF switch
Main PCB
BH change switch
NP sensor
BH lever switch
Power supply PCB
Main motor
Power switch/Inlet
F pulse motor
1-4
Outline of Mechanism Control system block diagram
Mechanism
Outline of
MACHINE (REAR COVER)
PF SW BH SW BW SW
MAIN PCB
NP NP SP
SENSOR 1 SENSOR 2 SENSOR
CPU FOOT
Z PULSE CONTROLLER
Z PULSE MOTOR JACK
MOTOR DRIVER
BUZZER
F PULSE F PULSE EEPROM
MOTOR MOTOR
DRIVER
RESET IC
MAIN MOTOR
FRONT COVER
SSVR PCB POWER SUPPLY PCB
OPERATION PCB
SS SW SWITCHING POWER
Z KEY x2 TWIN NEEDLE KEY 30V/5V CIRCUIT
BK SW
MAIN MOTOR
F KEY x2 REVERSE STITCH KEY
DRIVE CIRCUIT
NP SW
PATTERN SELECTION CONSTANT CURRENT
KEY x4 CIRCUIT
SPEED VR
POWER
SWITCH
LCD LED PCB LED PCB MODE SELECTION PCB
UTILITY STITCH KEY
WHITE COLOR
WHITE COLOR
LED INLET
LED LAMP
BACK LIGHT
CHARACTER STITCH KEY
LED x2 LED x2
LCD MODULE
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.
Reverse/Reinforcement stitch button . . . . . . This button is for reverse stitching or ending a seam. If the
button is pushed, it makes three to four stitches in that place and
stops automatically. It sews in the reverse with slow speed while
the button is held down.
Needle position button . . . . . . . . . . . . . . . . . This button toggles the needle between the up and down
positions.
Operation panel keys . . . . . . . . . . . . . . . . . . Input for pattern selection and conditions necessary for sewing.
Speed control lever. . . . . . . . . . . . . . . . . . . . This lever controls the speed of sewing.
BH (button hole) switch . . . . . . . . . . . . . . . . This switch is for detecting the forward and rear ends of the
button hole according to the BH presser foot and lever.
BH (button hole) lever switch . . . . . . . . . . . This switch detects whether the BH lever is up or down.
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.
Foot controller jack . . . . . . . . . . . . . . . . . . . This is the jack for plugging in the foot controller in use.
LED lamp . . . . . . . . . . . . . . . . . . . . . . . . . . . White LED lamps for illuminating the work space.
1-6
2 Disassembly
Main parts........................................ 2 - 2
Feed unit........................................ 2 - 22
Needle-presser unit ....................... 2 - 30
2-1
Main unit Main parts
Main parts location diagram
2-2
Main unit Main parts
1 Accessory table removal
1. Remove the accessory table 1.
Disassembly
1
2 Base cover removal 2 1
1. Remove the screw 1, and then remove the base cover 1.
2. Remove the screw 2, and then remove base cover A 2.
1 1
2-3
Main unit Main parts
3 Needle plate B assy. removal 1
1. Remove the needle plate cover 1.
2. Remove the needle plate B assy. 2.
2
3-1 Needle plate B assy. disassembly 2 1 5
1. Remove the cutter cover 2 from the needle plate B assy. 1.
2. Remove the spring plate 3 from the cutter cover 2, and then remove the
NT lower thread cutter 4.
3. Remove the 2 slide button hooks 5, and then remove the slide button 6.
3 4 5 6
2-4
Main unit Main parts
4 Face plate assy. removal 1
1. Remove the screw 1, and then remove the face plate assy. 1.
Disassembly
1
4-1 Face plate A assy. disassembly
1
1. Remove the screw 1, and then remove the cutter cover assy. 1.
2. Remove the CS retaining ring 2, and then remove the NT lower thread
cutter 3.
2
3 1
2-5
Main unit Main parts
5 Front cover assy. removal 1
1. Remove screws 1 (front, 1 pc.), 2 (rear, 1 pc.), and 3 (rear, 5 pcs.), and
then remove the front cover assy..
*Key point
· Disconnect the SSVR PCB lead wire connector 1 and the
operation PCB lead wire connector 2 from the main PCB
assy. 3 located near the front cover assy..
3 2
3
2 1
3
2-6
Main unit Main parts
6 Thread guide assy. A removal 1
1. Remove the two screws 1.
2. Remove the thread guide A assy. 1.
Disassembly
1
6-1 Thread guide assy. A disassembly
1. Remove the screw 1, and then remove the notch spring 2 from the thread
tension holder assy. 1.
2. Remove the thread dial shaft 3. 5
9
*Key point
· Turn the dial clockwise until it stops. 6
0 8
3. Remove the thread tension dial 4 and the thread tension plate assy. 5.
4. Remove the spring 6, washer 7, tension disc washer 8, thread release
plate 9, washer 7, tension disc B ;, and then tension disc A A in this
B
order from the caulking shaft of the thread tension holder assy. 1.
5. Remove the thread tension adjusting screw B from the thread tension plate A 7
assy. 5.
1
2
1
4
3
2-7
Main unit Main parts
7 Thread guide assy. B removal 1
1. Remove the screw 1.
2. Remove the thread guide assy. B 1.
1
7-2 Thread guide assy. B disassembly
1 1
1. Remove the screw 1.
2. Remove the thread catching spring case 2 from thread take-up holder B
1.
3. Remove the thread take-up spring 3 from the thread catching spring case
2.
4. Remove the thread guide wire 4 from thread take-up holder B 1.
2
3 2
4
1
2-8
Main unit Main parts
8 SSVR PCB assy. removal 1
1. Cut the 2 bands 1.
2. Remove the 3 screws 1, and then remove the SSVR PCB assy. 2.
Disassembly
2
1
9 Buttons removal 3 2
1. Remove the SS button 1, the backstitching button 2 and the NP button
3.
1
10 LED lamp removal 1 2
1. Disconnect the LED lamp connector 2 from the operation PCB assy. 1.
2. Remove the screw 1, and then remove the LED lamp 3.
1 3
2-9
Main unit Main parts
11 Operation PCB assy. removal 5 6 3 4
1. Disconnect the connector 2 from the operation PCB assy. 1.
2. Disconnect the connector 3 from the mode select PCB assy. 4.
3. Remove the 3 screws 1, and then remove insulator sheet 5 and the
operation PCB assy. 1.
4. Disconnect the LCD cable 6 from the operation PCB assy. 1.
1 1 2
12 Selecting and manual buttons removal 2
1. Remove the 2 selecting buttons 1.
2. Remove manual button A 2 and manual button B 3.
1 3
13 Single light guide assy. removal 1
1. Remove the 2 screws 1, and then remove the single light guide assy. 1.
1
14 Mode select PCB assy. removal 1
1. Remove the 2 screws 1, and then remove the mode select PCB assy. 1.
1
2 - 10
Main unit Main parts
15 SV keytop removal
1. Remove the SV keytop 1.
*Key point
· Press the SV keytop hooks 2 (2 locations) from the inside of
the front cover assy. 3 to remove the SV keytop.
Disassembly
1
3
2
2 - 11
Main unit Main parts
16 Panel cover assy. removal 1
1. Remove the 4 screws 1, and then remove the panel cover assy. 1 from
the front cover assy..
1
1
16-1 Panel cover assy. disassembly 2
1. Remove the panel plate assy. 1 from the panel cover assy. 2.
2. Remove the 2 panel plate holders 3 from the panel cover assy. 2.
1
3
3 2
2 - 12
Main unit Main parts
17 Base plate rubber removal
1. Remove the 2 base plate rubbers 1.
Disassembly
1
18 Upper cover thread guide removal
1. Remove the upper cover thread guide 1.
1
19 Main PCB assy. removal 2 3 1
1. Reconnect the all connectors from the main PCB assy. 1.
2. Remove the screw 1, and then remove the lead wire assy. 2 from the
main PCB assy. 1.
*Key point
· Remove the each lead wires from the guide parts of the
shutter cover 3.
3. Remove the 2 screws 2, and then remove the shutter cover 3 from the
rear cover assy..
4. Remove the 3 hooks, and then remove the main PCB assy. 1 from the
shutter cover 3.
1 2 2
2 - 13
Main unit Main parts
20 Power PCB assy. removal 2 4 3 1
1. Remove the ZPM lead wire assy. 1 from the guide parts 2 of the
insulation cover.
2. Remove screws 1 and 2 (1pc. /2 pcs.), and then remove the power PCB
assy. 3.
3. Disconnect the main motor lead wire 4 and the inlet assy. connector 5.
*Key point
· Hold the hook on the inlet assy. connector 5 and pull it out.
1 2
5
20-1 Power PCB assy. disassembly 3 1 1 2
1. Disconnect the power lead wire assy. connector 1 from the power PCB
assy. 2.
2. Remove the screw 1, and then remove the power plate spring 3 from the
power PCB assy. 2.
3. Remove the screw 2, and then remove the insulator sheet 4 and the
power PCB assy. 2 from the insulation cover.
2 4
21 Inlet assy. removal
1. Remove the screw 1, and then remove the inlet assy. 1 from the rear
cover assy..
1 1
2 - 14
Main unit Main parts
22 FC jack removal
1. Remove the jack nut 1, and then remove the FC jack assy. 2.
Disassembly
1 2
23 Main motor assy. removal 1 2
1. Remove the 2 screws 1, and then remove the main motor assy. 1 fron the
rear cover assy..
2. Remove the motor belt 2 from the main motor assy. 1.
1
23-1 Main motor assy. disassembly
1. Remove the motor fan 1. 1
2
2. Remove the 2 screws 1, and then remove the main motor 3 from the
motor holder 2.
1
3
2 - 15
Main unit Main parts
24 Tension pulley assy. removal 1
1. Remove the 2 screws 1, and then remove the tension pulley assy. 1 from
the rear cover assy..
1
24-1 Tension pulley assy. disassembly
1. Remove the screw 1, and then remove the tension pulley holder 2 from
the tension pulley assy. 1. 1
2
1
25 Spring removal 1
1. Remove the spring 1 from the feed unit assy. 2.
2
2 - 16
Main unit Main parts
26 Feed unit assy. removal 1
1. Remove the 2 screws 1, and then remove the upper shaft bearing presser
1.
2. Remove the 2 screws 2, and then remove the feed unit assy. 2 from the
rear cover assy..
Disassembly
1
2
2
27 Upper shaft assy. removal 1 1 2 1
1. Remove the screw 1.
2. Remove the 4 screws 2, and then remove the 2 upper shaft bearing
pressers 1.
3. Remove the upper shaft assy. 3 from the thread take-up counter weight
2, and then remove timing belt 420-5GT-6 4 and timing belt 372-2GT-6
5.
2 3 4 5
2 - 17
Main unit Main parts
28 Needle-presser unit removal 1
1. Peel the label, and then remove the screw 1.
2. Remove the 2 screws 2, and then remove the needle-presser unit 1.
2
1
29 Plate spring removal 2 1 3
1. Remove the adjusting screw 1.
2. Remove the 2 screws 1, and then remove the adjusting plate 2 and the
plate spring 3.
1
2
3
1
2 - 18
Main unit Main parts
30 Bobbin base assy. removal 1 2
1. Remove the bobbin base assy. 2 from the bobbin winder shaft 1.
Disassembly
30-1 Bobbin base assy. disassembly
1 2
1. Remove the bobbin thread cutter holder 2 from the bobbin base assy. 1,
and then remove the NT lower thread cutter 3.
3
31 Bobbin winder assy. removal 1 2 3 4 5
1. Remove the screw 1, and then remove the bobbin winder shaft stopper 1
and the bobbin winder spring 2.
2. Remove the screw 2, and then remove the senser holder 3 and the SW
assy : BW-F 4 from the bobbin winder shaft stopper 1.
3. Remove the 2 screws 3, and then remove the bobbin winder assy. 5.
4. Remove the rubber ring 6 from the bobbin winder pulley.
1 3 6 2
4 3 1
2
2 - 19
Main unit Main parts
32 Spool pin removal 2
1. Remove the spool pin spring 1 and pull out the spool pin 2.
2. Peel the spool pin stand 3.
1
3
33 Bobbin presser removal 1 1
1. Remove the screw