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HE-800A
16. TROUBLESHOOTING
106
ውዒ
-
ዎዎ
. Upper thread mis-winding
Cause Check Remedy Page
Installation height Adjust the upper thread scissors installation height. 75
Upper thread scissors
gradual opening timing
Adjust the timing so that the upper thread scissors
gradually start opening when the feed mechanism
moves about 1.5 - 2.5 mm.
76
Upper thread scissors
opening timing
Adjust so that the cam opens the stop plate
properly.
76
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
scissors
Lateral position of upper
thread scissors
Adjust the lateral position of the upper thread
scissors.
-
Upper thread tension Decrease tension to such a degree that it does not
influence stitch quality.
62
Stitch quality
Zigzag width in the zigzag
stitch portion
Use parameter number 05 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)
74
Underlay Underlay is being sewn.
Use parameter number 52 to reduce the underlay
sewing start pitch to about 0.5.
Use parameter number 48 to reduce the underlay
sewing speed.
* If sewing knitted wear, the upper thread may get
caught easily, so you may need to process the
end of the thread.
42, 43
Bar tack Straight bar tacking is
being carried out
When carrying out straight bar tacking, the upper
thread may get caught easily, so you may need to
process the end of the thread.
-
ውዒ
-
ዎዏ
. Work clamp is not raised (1) Pulse motor stepping sound cannot be heard
Cause Check Remedy Page
Work clamp lifting
height setting
Check the work clamp
lifting height setting.
Change the settings of memory switch Nos. 04, 05,
06.
79
Cord connection Check the cord connections and contacts. - Presser lifter pulse
motor
Presser lifter pulse motor
driving gear
Check if the drive gear screw is loose.
-
Treadle Does the work clamp rise
when the treadle is
depressed backward?
If it rises, use memory switch No. 08 to adjust the
threshold value for lowering the work clamp to a
positive value.
79
4020Q
Approx. 1 mm