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19.
NEEDLE THREADER (EXCHANGE)
HOW TO EXCHANGE NEEDLE THREADER
1.
Remove the needle and lower the presser foot.
2.
Push down the needle threader and take it out.
3.
Place a new one so that the guide is immediately under the groove as shown in figure A .
4.
Push the needle threader all the way up so that the guide is fits into the groove.
20.
NEEDLE THREADER
(CHECKING THE HOOK IN STANDARD POSITION)
STANDARD
1.
The clearance between the top of hook and the top of needle eye is 0 mm.
2.
Threading is possible when needle is located higher than 8 mm from the needle plate.
CHECK (refer to illustration)
Case A
Hook position is too high. (Hook hits needle and cannot go through needle eye.)
Case B
Hook position is too low. (Hook goes through needle eye but it catches bottom part of needle eye.)
Summary of Contents for BL7800
Page 1: ...4 2001...
Page 4: ...2 1 MECHANICAL CHART...
Page 9: ...7 1 DISASSEMBLING AND REASSEMBLING THE OUTER PARTS AND MAIN PARTS 8 2 LEAD WIRE ARRANGEMENT 19...
Page 15: ...13...
Page 17: ...15...
Page 19: ...17...
Page 21: ...19 2 LEAD WIRE ARRANGEMENT...
Page 43: ...41 Main PC board...
Page 44: ...42 Power supply unit Power 120 Power 230...
Page 45: ...43 Operation board Other PC boards...
Page 46: ...BL7800 T1010141...