Brother International BAS-416 Service Manual - Page 152
Problem, Check, point
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Problem ■ Upper shaft does not turn. ■ Stitch cannot be made. ■ Needle breaks. Check point • Is thread tangled in rotary hook? [How to adjust] Remove rotary hook and see whether upper shaft rotates or not. If thread is tangled, turn upper shaft by force to trim thread or remove rotary hook and thread. • Is needle attached properly? • Is timing of needle and rotary hook correct? • Is needle direction and height properly adjusted? • is needle bent? • Is needle tip blunted? • Is timing of needle and rotary hook correct? • Is there looseness or play in the needle bar case? When there is play in the needle bar case C> M Cam gear B Change collar Corn shaft Change collar -\ Q ♦-. Corn shaft -1 Cam gear B Adjust collar when there is looseness of cam shaft in needle bar flip-up mechanism. • Is rotary hook holder properly attached so that rotary hook does not rotate? 145 BAS-401 • 412A • 416A • BES-1210AC
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