HappyJapan HCR3-1502, Maintenance Manual

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201
E9-6 Upper thread remains
Trouble Factor Cause of trouble and measure Page
Upper thread
Mechanical
1.
Upper thread is difficult to come out of keeper at time of thread cut (bent or warp etc.).
remains 1-1 Modify bent or warp.
1-2 Replace keeper.
2. Keeper doesn't return properly at time of thread cut.
2-1 Modify bent of keeper.
2-2 Adjust position to fix. 4-5-8
2-3 Adjust it again if movement is not smooth.
3. Upper thread does not come off from magic tape of thread holder.
3-1 Insert something(Thickness 0.1-0.2mm) into holder then move it right and
left to put magic tape in order.
3-2 Replacement of magic tape.
4. Doesn't thread catch hook cut upper thread?
4-1 Polish burr on hook.
4-2 In case hook is in trouble, replace.
Operator 1. Setting of thread tension is weak.
1-1 Strengthen so as not to cause trouble in sewing rhythm. 2-9
2. Is [Machine settings] properly set? ( 15-1 )
2-1 Select setting of length of TRD. cut [Normal].
Thread & 1. Using hard cloth make thread difficult to go through.
cloth 1-1 Select needle and thread.
3-3
2. Using thick cloth make thread difficult to go through.
2-1 Select needle and thread. 3-3
3. Is thread used to suit embroidery? (thread twist, tender thread). 3-2
3-1 Don't use too strongly twisted thread.
3-2 Twist of thread is to be left-wise.
3-3 Use tender thread.
3-4 Don't use thread with knot or uneven size.
( ) ----- Reference instruction book