Brother International HE-800B Instruction Manual - English - Page 102

Upper thread miss-winding

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11. TROUBLESHOOTING 11-22. Upper thread miss-winding Items with a "*" in the "Page" column should only be handled by a qualified technician. Cause Check Remedy Upper thread trimmer Installation height Adjust the upper thread trimmer installation height. Upper thread trimmer Adjust the timing so that the upper thread trimmer gradual opening timing gradually start opening when the feed mechanism moves about 1.5 - 2.5 mm. Upper thread trimmer Adjust so that the cam opens the stop plate properly. opening timing Upper thread trimmer assembly movement ・Polish blade of upper thread trimmer M and upper thread guide with buffer. ・Check for burrs on the top surface of upper thread trimmer M. ・Replace the parts. Lateral position of upper Adjust the lateral position of the upper thread trimmer. thread trimmer Approx. 1 mm Page 68* 69* 69* * * Stitch quality Work clamp Underlay Bar tack 4020Q Upper thread tension Zigzag width in the zigzag stitch portion Uneven material feeding Underlay is being sewn. Straight bar tacking is being carried out Decrease tension to such a degree that it does not influence stitch quality. Use parameter number 08 to increase the zigzag width to such a degree that it does not influence the seam shape. ・Increase work clamp pressure. (Press material so that the material is properly stretched.) ・When using knits or woven materials, replace the parts with the -3 specification parts: Length feed plate (for specification -3), work clamp assembly (for knits), needle plate 1.2 (for specification -3) ・Use parameter number 47 to reduce the underlay feed pitch to about 0.5. ・Use parameter number 14 to reduce the underlay sewing speed. * If sewing knitted wear, problems may easily occur with the insertion of the upper thread, so you may need to process the end of the thread. When carrying out straight bar tacking, problems may easily occur with the insertion of the upper thread, so you will need to process the end of the thread. 26, 27 36 66* * 39 36 - 11-23. Work clamp is not raised (1) ...... Pulse motor stepping sound cannot be heard Items with a "*" in the "Page" column should only be handled by a qualified technician. Cause Check Remedy Work clamp lifting Check the work clamp Change the settings of memory switch Nos. 001, 002, height lifting height setting 003, 004. Work clamp motor Cord connection Check if there are any problems with the connection and contacts of work clamp motor connector P23 on the main P.C. board. Work clamp motor drive Check if the drive gear screw is loose. gear Page 56 10* * 93 HE-800B

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HE-800B
11. TROUBLESHOOTING
93
11-22. Upper thread miss-winding
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Page
Installation height
Adjust the upper thread trimmer installation height.
68*
Upper
thread
trimmer
gradual opening timing
Adjust the timing so that the upper thread trimmer
gradually start opening when the feed mechanism
moves about 1.5 - 2.5 mm.
69*
Upper
thread
trimmer
opening timing
Adjust so that the cam opens the stop plate properly.
69*
Upper
thread
trimmer
assembly movement
・
Polish blade of upper thread trimmer M and upper
thread guide with buffer.
・
Check for burrs on the top surface of upper thread
trimmer M.
・
Replace the parts.
*
Upper thread trimmer
Lateral position of upper
thread trimmer
Adjust the lateral position of the upper thread trimmer.
*
Upper thread tension
Decrease tension to such a degree that it does not
influence stitch quality.
26, 27
Stitch quality
Zigzag width in the zigzag
stitch portion
Use parameter number 08 to increase the zigzag width
to such a degree that it does not influence the seam
shape.
36
Work clamp
Uneven material feeding
・
Increase work clamp pressure. (Press material so
that the material is properly stretched.)
・
When using knits or woven materials, replace the
parts with the -3 specification parts:
Length feed plate (for specification -3), work clamp
assembly
(for
knits),
needle
plate
1.2
(for
specification -3)
66*
*
Underlay
Underlay is being sewn.
・
Use parameter number 47 to reduce the underlay
feed pitch to about 0.5.
・
Use parameter number 14 to reduce the underlay
sewing speed.
* If sewing knitted wear, problems may easily occur
with the insertion of the upper thread, so you may
need to process the end of the thread.
39
36
Bar tack
Straight
bar
tacking
is
being carried out
When carrying out straight bar tacking, problems may
easily occur with the insertion of the upper thread, so
you will need to process the end of the thread.
–
11-23. Work clamp is not raised (1)
…… Pulse motor stepping sound cannot be heard
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Page
Work
clamp
lifting
height
Check
the
work
clamp
lifting height setting
Change the settings of memory switch Nos. 001, 002,
003, 004.
56
Cord connection
Check if there are any problems with the connection
and contacts of work clamp motor connector P23 on
the main P.C. board.
10*
Work clamp motor
Work clamp motor drive
gear
Check if the drive gear screw is loose.
*
4020Q
Approx. 1 mm