Brother International HE-800A Instruction Manual - English - Page 116

16. TROUBLESHOOTING Cause Upper scissors thread Work clamp home position sensor Check Upper thread scissors operation Work clamp home position sensor position Remedy Adjust the upper thread scissors to the standard setting. Adjust the work clamp home position sensor position. Page 76 - Lower thread is not trimmed (pulls when material is removed) Cause Machine stopping position Check Rotary hook touches lower thread retainer at the stop position Remedy Adjust the needle up stop position. Retainer Inner rotary hook presser Page 77 Fixed knife set Fixed knife and movable knife do not mesh. Adjust the fixed knife set installation position. Fixed knife 4021Q - Movable knife Knife tip is bent or Repair or replace the knife. chipped. 4024Q - Feed mechanism does not operate or motor is out of step Cause Feed pulse motor Upper scissors thread Check Cord connection Upper thread scissors position Remedy Check the cord connections and contacts. Remove and re-install the upper thread scissors. Page - - Check if the cam opens the stop plate. Projection on scissors M is inserted. * Always make sure that the upper thread scissors are in the correct position before use. 4025Q Adjust the cam position. * If the feed mechanism operates when the cam has not opened the stop plate, the cutter will bump against the upper thread scissors. 76 HE-800A 4018Q 108