HappyJapan HCH-701-30, Maintenance Manual

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Maintenance of thread path
3-1-1
In a bid to prevent poor sewing finish or thread break, please keep places where thread contacts in the best condition.
1. Thread tension, detecting roller
a) Revolution must be smooth
b) No sticking of lint or dust
2. Ceramic and rim of take-up lever
a) No burr and crack
3. Thread path in lower side and needle holder.
a) No burr and crack
4. Needle
a) Needle tip shouldn't be warped or bent.
When you slide needle tip on surface of nail and
if the nail gets scratched.
needle tip is warped. Please exchange it with new one.
Please place needle on flat surface and check
clearance (A) from side.
If clearance is not equal, needle is bent.
Please replace it with new one.