White 1927 manual Trouble Chart, Probable Cause, P. 1

21. TROUBLE CHART

PROBLEM		PROBABLE CAUSE
Breaking lower	Thread not wound evenly on the bobbin
thread	or not	drawn up correctly
	Lower thread tension too tight
	Lint stuck in the bobbin case and inside
	the tension spring
Skipping stitches Needle not fully inserted
	Needle	bent
	Size or type of needle and thread not
	suitable	for the	material
	Incorrect upper		threading

Too much oil on the hook

Irregular stitches Incorrect size of needle for the material

Upper thread tension too loose

Incorrect lower tension

The material not Pattern selection dial not set correctly

fed correctly

Incorrect feed dog height

Lint stuck on the feed dog

—47--

CORRECTION

P.10, P.15

P.12

Remove lint and fluff with a cleaning brush

P. 6

P.6 P 1 6

P.1 3

P.46

P.1 6

P.20

P.12

P. 1 7

P.12

P.45