i
1. Outline of Mechanism ........................................................................1 - 1
Main Mechanisms ...........................................................................1 - 2
Driveline ..........................................................................................1 - 3
Positions of electronic components ...................................................................1 - 4
Control system block diagram ...........................................................................1 - 6
Main motor control .............................................................................................1 - 7
Pattern generator ...............................................................................................1 - 8
Operation of other electronic components .........................................................1 - 9
Using the threader ...........................................................................................1 - 10
2. Disassembly ........................................................................................2 - 1
Main parts ..........................................................................................................2 - 2
Flap table assy. disassembly ...........................................................................................................2 - 3
Bobbin winder assy. removal ..........................................................................................................2 - 3
Bobbin winder assy. disassembly ...................................................................................................2 - 4
Needle plate B assy. removal ...........................................................................................................2 - 4
Needle plate B assy. disassembly ....................................................................................................2 - 4
Front cover assy. removal ..............................................................................................................2 - 5
Base removal ....................................................................................................................................2 - 5
Handle removal ................................................................................................................................2 - 6
Base cover B assy. removal .............................................................................................................2 - 6
Base cover B assy. disassembly .......................................................................................................2 - 6
Front cover .........................................................................................................2 - 7
Cassette cover removal ....................................................................................................................2 - 8
Remove base cover A. ......................................................................................................................2 - 8
PCB assy : operation S2. removal (S2 only). .................................................................................2 - 9
Operation PCB assy. disassembly (S2 only) ................................................................................2 - 10
LED PCB-SR assy. removal ..........................................................................................................2 - 11
SSVR PCB assy. removal ..............................................................................................................2 - 11
Single light guide assy S3. assy. removal (S3 only) .....................................................................2 - 11
PCB assy : operation S3. removal (S3 only) ................................................................................2 - 12
Rubber key removal (S3 only) ......................................................................................................2 - 12
SV key top removal ........................................................................................................................2 - 12
LED cover removal. .......................................................................................................................2 - 13
Break cover removal ......................................................................................................................2 - 13
Power PCB assy. removal .............................................................................................................2 - 13
Rotary hook drive mechanism .........................................................................2 - 14
Main PCB assy./motor PCB assy. removal ..................................................................................2 - 15
Main motor assembly removal .....................................................................................................2 - 16
Main motor assembly disassembly ...............................................................................................2 - 16
Lower shaft A assy. removal .........................................................................................................2 - 16
Lower shaft A assy. disassembly ..................................................................................................2 - 17
Feed module removal ....................................................................................................................2 - 17
Tension pulley assy. removal ........................................................................................................2 - 17
Upper shaft mechanism ...................................................................................2 - 18
Bobbin winder assy. removal ........................................................................................................2 - 19
Bobbin winder assy. disassembly .................................................................................................2 - 19
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