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DRAFT – VERSION
5.12 Thread tension
Important! To use the Service Program, the machine must be running (switched on). Refer to
the safety instructions, please.
5.12.1 Upper thread tension
• 6j Automatic upper-thread tension
• Use a cotton thread DMC 50 BLANC
(recommendation by BERNINA, see Service
Information in Infogate, Ref: 18249) to thread
machine up to and including thread take-up.
Step 1:
• Attach the 30.6-gram gauge 008709.72.00 to the
upper thread (see fig. 1).
• Carefully tilt the machine forward until the gauge
hangs freely in the air. (Caution: Don't drop it)
• Select test 6j for thread tension adjustment. Then
select the icon in the screen. The selected gauging
thread appears.
• Select DMC 50, 100% cotton, color 'blanc' (white).
• The gauge mustn’t move down. Turn the stitch-width
knob to adjust if necessary.
• Add an additional 5-gram weight (fig. 2). The gauge
should move down slowly now. Turn the stitch-width
knob to adjust to correct value if necessary. Press
to save the set value. You will automatically be
brought to step 2.
Step 2:
• Replace the 5-gram weight with the 54.4-gram weight
(85gr total weight). See pict. 3. The gauge mustn't
move down. Turn the stitch-width knob to adjust if
necessary.
• Add another 10g (2x5g). See fig. 4. The gauge should move down slowly
now. Use the stitch-width knob to adjust if necessary.
• Press to save the set value.
• “Successful“ appears along with the set tension values.
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