Happy HCS-1201-30, Maintenance Manual

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Adjustment of thread cut timing
3-6-5
1. Remove power supply.
2. Loosen screw on thread cut cam.
3. Set dial disc to [ 116 degrees ].
4. Turn thread cut cam clock-wise while pushing
release lever down.
<Important> Push thread cut cam against rotary hook
shaft collar A so as not to produce clearance
between cam and collar .
5. Tighten screw on thread cut cam when moving knife began
to open.