Brother LH4-B800E Service Manual Page 125

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  • TROUBLESHOOTING
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LH4-B800E
5 - 10
5. Troubleshooting guide
5-9. Unraveling of thread trimmed by upper thread trimmer assembly
5-10. Needle thread mis-trimming
Check burr on upper
side here
Check burr here
Cause Check Solution page
Upper thread
trimmer
assembly
Upper thread trimmer
assembly position
Refer to "5-8. Needle thread runout"
Burr on tips of upper
thread trimmer and
upper thread upper
trimmer
Polish with buff
Replace the part
-
Tension
release
timing
Opening amount for
zigzag tension discs
and bar tack tension
discs (particularly
zigzag tension discs)
Refer to "5-8. Needle thread runout"
Upper
clamping foot
Presser foot rise speed Reduce the presser
foot rise speed.
Change using memory switch No.
02..
-
(Instruction)
Cause Check Solution page
Upper thread
trimmer
assembly
Upper thread trimmer
assembly position
Refer to "5-8. Needle thread runout"
Operating pressure of
upper thread trimmer
assembly
Upper thread trimmer
driving spring
Trimmer
driving arm
Upper thread scissors
cutting depth
(clearance between
scissors assembly and
presser roller bracket)
Adjust the position of
the trimmer driving arm
roller.
Adjust the upper thread scissors
cutting depth.
4-15
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