6 - 5
Repa
ir
Manual
Repair Manual
12 Thread cassette
operation catches part
way through.
Bad needle stop position
Threading function
When threading is carried
out with Schappe Spun
Sewing Thread #60 / #11
needle and Schappe Spun
Sewing Thread #30 / #16
needle, the threading lever
should move smoothly and
threading through the
needle hole should be
possible.
• NP sensor damage
Replace NP PCB assy.
• Grease or dirt adhering to NP
sensor
Remove grease and dirt
• Timing shutter damage
Replace upper shaft assy.
Bad needle thread block rotational
position
Adjust the needle thread block
No thread cassette
inserted
Bad presser plate (pretension plate)
release plate spring position
Adjust presser plate position
Deformed presser plate (pretension
plate) release plate spring
Replace presser plate
13 Threading impossible
(shuttle)
Bad cassette threading height
Readjust cassette threading height
Cassette threading
function
Distance from the upper
edge of the needle hole to
the thread 2.1 +/- 0.3 mm
Distance from front of the
needle to the thread 0.8 +/
- 0.2 mm
The shuttle should be
released when the hook is
deep in the needle hole
Shuttle does not hold the thread (claw
does not grasp thread)
Replace thread guide base assy.
Cassette threading
function
Shuttle claw should
securely hold thread
Thread cassette K thread guide disk
does not hold thread
Replace thread cassette
Cassette threading
function
Thread cassette should
hold thread
Shuttle returns part
way through
• Bad cassette tension plate
operation
Replace thread guide base assy.
Cassette threading
function
• Thread cassette side surface
wear
Replace thread cassette
Shuttle does not
operate
Thread cassette side surface wear
Replace thread guide base assy.
Cassette threading
function
Shuttle gets stuck part
way through
Shuttle shaft complication
Replace thread guide base assy.
Cassette threading
function
14 Thread does not
catch on needle block
Bad thread guide link B operation
Replace thread guide link
Cassette threading
function
Thread should catch on
needle block
15 Either upper thread
tension or bobbin
thread tension
Upper thread tension is too strong /
weak
(Check the screw lock on the tension
disk tension adjustment screw)
Upper thread tension with Schappe
Spun Sewing Thread #60 is 0.436 –
0.446 N (44.5 – 47.5 g)
Upper thread
tension
Thread tension is good in
actual sewing.
Bobbin thread tension is too strong /
weak
(Check inner rotary hook screw lock)
Bobbin thread tension with Schappe
Spun Sewing Thread #60 is 0.1 –
0.12 N (10 – 12 g)
Bobbin thread
tension
Upper thread or bobbin thread
unsuitable
Replace upper thread or bobbin
thread
16 Utility sewing
Needle breakage
Needle breaks.
Utility sewing
(straight line /
zigzag)
Needle does not break in
utility sewing.
No abnormal sound in
utility sewing.
• Inner rotary hook slips because
the inner rotary hook and inner
rotary hook bracket back/front
overlap is too small
Adjust inner rotary hook bracket
position
• Inner rotary hook slips because
the inner rotary hook and inner
rotary hook bracket up/down
overlap is too small
Adjust inner rotary hook bracket
position
• Thread catches on spool
(thread falls down to the right
because the spool pressure is
insufficient)
Rethread
• Thread catches on spool
presser
(scratches on spool presser)
Replace spool presser
Needle catches and bends before or
after sewing.
Needle replacement
Thread breakage
Thread fraying
Thread breakage.
Thread does not break in
utility sewing.
• Thread catches on spool
(thread falls down to the right
because the spool pressure is
insufficient)
Rethread
• Thread catches on spool
presser (scratches)
Replace spool presser
• Outer rotary hook scratches
Replace outer rotary hook
Problem
Primary factors and causes
Repair method
Items for
Inspection
Inspection method and
standards
www.promelectroavtomat.ru
Summary of Contents for CS8000 Series
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Page 22: ...2 2 Main partslocation diagram Main unit www promelectroavtomat ru ...
Page 38: ...2 18 Upper shaft mechanismlocation diagram Main unit www promelectroavtomat ru ...
Page 45: ...2 25 Disassembly Thread tension mechanismlocation diagram Main unit www promelectroavtomat ru ...
Page 53: ...2 33 Disassembly Thread hook mechanism location diagram Main unit www promelectroavtomat ru ...
Page 56: ...2 36 Needle presser module breakout diagram Modules www promelectroavtomat ru ...
Page 65: ...2 45 Disassembly Feed module breakout diagram Modules www promelectroavtomat ru ...
Page 74: ...3 2 Thread tension mechanism location diagram Main unit www promelectroavtomat ru ...
Page 85: ...3 13 Assembly Thread hook mechanism location diagram Main unit www promelectroavtomat ru ...
Page 88: ...3 16 Upper shaft mechanism location diagram Main unit www promelectroavtomat ru ...
Page 115: ...3 43 Assembly Main parts location diagram Main unit www promelectroavtomat ru ...
Page 120: ...3 48 Needle presser modulebreakout diagram Modules www promelectroavtomat ru ...
Page 136: ...3 64 Feed module breakout diagram Modules www promelectroavtomat ru ...
Page 201: ...6 1 6Repair Manual www promelectroavtomat ru ...
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