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Brother HE-800B Service Manual Page 9

Electronic direct drive lockstitch button holer.
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thread scissors ............................................ 99
upper thread scissors ................................ 100
gradual opening timing .............................. 101
opening timing ........................................... 102
7-13.
knife engagement amount ......................... 104
amount ...................................................... 104
timing ........................................................ 105
amount ...................................................... 106
7-14.
Adjusting the bobbin presser ........................... 106
7-15.
7-16.
tension control ................................................. 108
7-17.
tension control ................................................. 108
7-18.
7-19.
7-20.
position ............................................................ 110
7-21.
stroke ............................................................... 111
SWITCH (OPTION) .............................
9. ELECTRIC MECHANISM ...................
9-1.
9-2.
and in the operation panel ................................. 114
9-3.
Fuse explanation ................................................ 115
9-4.
Connectors......................................................... 116
9-4-1. Connector positions ..................................... 116
9-4-2. Contact failure ............................................. 118
9-5.
Troubleshooting ................................................. 123
9-5-1. Troubleshooting flowchart ........................... 123
11. TROUBLESHOOTING ......................
11-1.
Upper thread breakage .................................... 148
11-2.
Skipped stitches............................................... 149
11-3.
Uneven seams (1)......At the sewing start ....... 151
11-4.
Uneven seams (2)......Lower thread is lifted
11-5.
Uneven seams (3)......Seam lifts up at the
11-6.
Uneven seams (4)......Uneven sewing pitch at
11-7.
Uneven seams (5)......Poor rounding of seam 153
11-8.
Uneven seams (6)......Around rear tack or
11-9.
Uneven seams (7)......Loose thread end at
11-10.
Uneven seams (8)......Thread sticking out at
11-11.
Uneven seams (9)......Sticking in needle
11-12.
Uneven seams (10)......All stitches ............... 155
11-13.
Upper thread run out ..................................... 156
11-14.
thread trimmer assembly .............................. 158
11-15.
Upper thread miss-trimming .......................... 159
11-16.
11-17.
Needle breakage ........................................... 161
11-18.
cutting) .......................................................... 162
11-19.
Cutter does not return ................................... 162
11-20.
11-21.
Seam is cut ................................................... 163
11-22.
Upper thread miss-winding............................ 164
11-23.
not occur. ...................................................... 164
11-24.
Work clamp is not raised (2)......Error occurs.
...................................................................... 165
11-25.
material is removed) ..................................... 166
11-26.
occurs. .......................................................... 166
11-27.
112
when needle zigzags .................................... 167
113
11-28.
11-29.
needle up stop position ................................. 167
11-30.
operation is not possible ............................... 167
142
148
HE-800B

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Troubleshooting

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