Happy HCS-1201-30, Maintenance Manual

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Adjustment of the lowest needle point
3-2-3
1. Loosen screw on detecting disk.
2. Turn upper shaft so that needle bar driver ass’y comes
in the bottom.
In case there is moving head, bring needle bar down.
3. When dial disc reads [ 0 degree ], fix detecting disk.
4. Work will finish by checking and adjusting timing
mentioned below.
(1)upper shaft timing (L point, C point)
(2)Take-up lever timing
(3)Shuttle hook timing
(4)Thread cut timing
Please use dial gauge for strict checking.
Please see that timing on dial disc comes to [ 0 degree ]
when dial swings in highest value.
Dial-gauge
Needle holder