Brother International HE-800A Instruction Manual - English - Page 114

Upper thread mis-winding

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16. TROUBLESHOOTING Upper thread mis-winding Cause Upper scissors thread Check Installation height Upper thread scissors gradual opening timing Upper thread scissors opening timing Upper thread trimmer assembly movement Lateral position of upper thread scissors Remedy Adjust the upper thread scissors installation height. Adjust the timing so that the upper thread scissors gradually start opening when the feed mechanism moves about 1.5 - 2.5 mm. Adjust so that the cam opens the stop plate properly. ࡮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. Adjust the lateral position of the upper thread scissors. Page 75 76 76 - Approx. 1 mm - Stitch quality Work clamp Underlay Bar tack Upper thread tension Zigzag width in the zigzag stitch portion Uneven material feeding Underlay is being sewn. Straight bar tacking is being carried out 4020Q Decrease tension to such a degree that it does not influence stitch quality. Use parameter number 05 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 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. When carrying out straight bar tacking, the upper thread may get caught easily, so you may need to process the end of the thread. 62 36 74 42, 43 - Work clamp is not raised (1) Pulse motor stepping sound cannot be heard Cause Work clamp height setting Presser lifter motor Treadle lifting pulse Check Check the work clamp lifting height setting. Cord connection Presser lifter pulse motor driving gear Does the work clamp rise when the treadle is depressed backward? Remedy Change the settings of memory switch Nos. 04, 05, 06. Check the cord connections and contacts. Check if the drive gear screw is loose. If it rises, use memory switch No. 08 to adjust the threshold value for lowering the work clamp to a positive value. Page 79 - 79 HE-800A 106

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HE-800A
16. TROUBLESHOOTING
106
１６
-
２２
. 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.
-
１６
-
２３
. 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