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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
102


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