Janome 1200D, Руководство пользователя, Страница: 58 / 91

56
ANNEX
TROBLE SHOOTING - COVER HEMS
- irregular loop formation on the chain needles -
When chain needles start rising from their lowest positions, Chain looper also atarts its
motion from its far right position to the left. Turn handwheel towards you to bring Chain
needles up and make sure if Chain looper passes into loops of Chain needle thread
behind each needle.
See cover hem stitch formation on page . However, it is possible that some irregular
loops will appear on the chain needle thread. In that case, the chain needle threads will
not be positioned correctly and will fall down to the right or left (Fig. 1).
As result of the above, the following peoblems may happen.
1. Cover hem (Narrow & Wide)
If "L2" needle falls into its needle thread loop (Fig. 1-2). Check position of chainstitch
eccentric (0.5-1.0mm). See page 11 for adjustment. Check clearance between chain
looper and "L0 / L1" needle. If the problem is not solved, replace chain looper.
2. Triple Cover Hem
If "L2" needle falls into the Red needle thread loop (Fig. 3). Check if the tension is
correctly set. Check the chain looper clearance and orbital timing "L0-L2" See page 11
for adjustment. If the ploblem is not solved, replace chain looper.
3. Triple Cover hem
If "L2" needle falls into its needle thread loop (Fig.4). Replace chain looper.
4. Cover hem (Narrow & Wide)
If "L2" needle falls into both of the "L2" and "L1" needle thread loops (Fig.5).
Replace chain looper.
5. Cover hem
If "L0" or "L1" needle thread is pulled to the right (Fig.6). Check and make sure that the
"L0" or "L1" needle is not touching the needle plate hole. When checking the above, use
new needle.
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