Brother LH4-B800E, Руководство по обслуживанию

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LH4-B800E
5 - 14
5. Troubleshooting guide
Cause Check Solution page
Upper thread
scissors
Scissors installation
height Refer to "5-3. Uneven seams 1)"
Scissors gradual
opening timing Adjust the gradual
opening timing to an
appropriate setting. Refer to "4-13-7. Adjusting the upper thread
scissors gradual opening timing"
Upper thread scissors
opening timing
Adjust the opening
timing to an
appropriate setting. Refer to "4-13-8. Adjusting the upper thread
scissors opening timing"
Upper thread trimmer
movement
Polish blade of upper
thread middle trimmer
and upper thread guide
with buffer
Check for burrs on the
top surface of upper
thread middle trimmer
Change the parts
In case of dull upper thread trimmer
Refer to "5-9. Unraveling of thread
trimmed by upper thread trimmer
assembly"
Refer to "5-11. Needle strikes upper
thread trimmer"
-
Lateral position of
upper thread scissors Adjust the lateral
position of the upper
thread scissors.
4-14
Stitch quality Needle thread tension Decrease tension to
such a degree that it
does not influence
stitch quality
-
(Instruction)
Zigzag width in the
zigzag stitch portion Widen zigzag width to
such a degree that it
does not influence
stitch quality -
(Instruction)
Upper
clamping foot
Uneven material
feeding
Increase presser foot
pressure
(Press material so that
the material is properly
stretched)
When using knitted or woven
material, change upper clamping
foot for subclass -3 parts
Parts to change
Length feed plate (subclass -3)
Upper clamping foot assembly (for
knits)
Needle plate 1.2 (subclass -3)
4-8
Underlay Underlay sewing Reduce the setting for
the sewing start pitch
for underlay sewing
(parameter No. 52) to
around 0.5.
Reduce the underlay
sewing speed
(parameter No. 48).
-
(Instruction)
5-14. Needle thread mis-winding
Approx. 1 mm