Brother International BAS-311F-L Instruction Manual - English - Page 78

Problem Cause Check 14. TROUBLESHOOTING Remedy Page Improper tension and height of thread take-up spring Thread take-up spring tension and height Adjust the tension and height of the thread takeup spring. 25 Unstable upper thread length Improper adjustment of sub tension Needle up stop position fluctuates. sub tension See "Unstable needle up stop position". Adjust the sub tension. Fixed knife is blunt. Fixed knife blade Sharpen or replace the fixed knife. Unstable needle up stop position Electrical trouble Refer to the details for [E.22] in the error code table. 63 Machine does not operated when power is turned on and foot switch is depressed. Head position switch does not work. Head position switch cord connection. Switching plate position. Head position switch is broken. Check if the disconnected. cord is 11 13 Adjust the position of the switching plate. 7 Replace the head position switch. BAS-311F-0, 311F-L, 326F-0 71