Automatic Upper-Thread Tension; Test Tie On - Bernina B 590 Service And Maintenance Manual

6j Automatic upper-thread tension
Is used to adjust upper thread tension basic value
Check:
• Select test 6j.
• Press the icon to start the calibration. The colour of the
icon changes to light blue.
• Use the recommended gauging thread DMC 50 white.
• A 'Successful!' message will appear on successfully
completed adjustment.
• To return to section 6, press
Adjustment note:
• For detailed electronic upper-thread adjustment
Important!
•
Gauging thread DMC 50 white can be ordered from BERNINA under item no. 652010.20.++.
•
Cotton thread is prone to dry out. Moisture loss reduces tensile strength and gliding properties
of thread.
6k Test Tie On
Is used to carry out, step by step, tie-on function test
Check:
• Select test 6k.
• Press thread cutter key on head frame.
• Start of tie-on sequence. Needle position is at 210
degree.
• Press presser-foot lift key on head frame.
• Increase thread tension.
• Thread catcher is activated.
• Reset thread tension to 0.3.
• To return to section 6, press
Repair note:
•
Check stitch plate carrier and thread catcher for dirt or dust and check mechanical
smooth running.
•
Carry out test 6d. Check cables for deformation and/or wear and tear.
•
Replace complete clutch carriage
•
Replace PCBA-Base
BERNINA International AG
.
(see
.
(see 4.2.4).
Seestrasse 161 CH-8266 Steckborn
DRAFT – VERSION
5.12.1).
(see 4.3.11).
Schweiz Seite 151 von 172