Brother International DB2-B791 Service Manual - Page 54

Problem Cause Check Solution Page dImproper thread wiper facing Thread wiper does not wipe thread. Thread wiper strikes needle HThread wiper does not operate. 1Thread wiper operation is too short. Reverse and forward stitch lengths do not match when using the wuick reverse function. Improper forward, reverse adjustment Not enough oil pan Oil Adjust facing. 45 Adjust thread wiper height. 45 Set thread wiper solenoid switch to on, or replace 45 solenoid. Adjust operating time. Adjust eccentric pin. 34 Add oil. 3 No oil in gauge window; rotary hook not lubricated Filter clogged Tube disconnected Tube broken Pump filter Tube Clean fi lter replace. Reconnect tube. or z Replace tube. Rotary hook I__ lubr i cat adjustment ion screw Rotary hook lubrication Loosen screw. 3 tightened too far - 57 -