HE-800B
11. TROUBLESHOOTING
158
11-14. Unraveling of thread trimmed by upper thread trimmer assembly
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Page
Upper thread trimmer
assembly
Installation position of
upper thread trimmer
assembly
Adjust the installation position of upper thread trimmer
assembly by moving the setting plate assembly.
・
Upper thread trimmer longitudinal position
adjustment
・
Upper thread trimmer cutting depth adjustment
98, 99
Burr on tips of upper thread
trimmer M and upper
thread trimmer U.
Polish with buff or replace the part.
–
Tension release
timing
Opening amount of zigzag
tension discs and bar tack
tension discs (particularly
zigzag tension discs)
・
Adjust the zigzag tension discs by moving the
tension stud bracket in and out.
・
Adjust the bar tack tension discs opening amount to
0.5 - 1.0 mm by removing the top cover and moving
the tension release cam.
108
4009Q
4005Q
Check burr on upper
side here
Check burr here
4008Q
Tack tension
0.5 - 1 mm
Zigzag tension
Summary of Contents for HE-800B
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Page 126: ...9 ELECTRIC MECHANISM HE 800B 117 Power PCB Cutter PCB LCD panel PCB 0831D 0768D 0769D ...
Page 133: ...9 ELECTRIC MECHANISM HE 800B 124 0851D ...
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Page 135: ...9 ELECTRIC MECHANISM HE 800B 126 0853D ...
Page 177: ...MEMO 168 HE 800B ...
Page 178: ...SERVICE MANUAL 2014 Brother Industries Ltd All Rights Reserved HE 800B I3061003D 2014 03 D 1 ...