Section 5 - Locations Of Stepping Motors In The Machine; Stitch-Width Stepping Motor - Bernina B 590 Service And Maintenance Manual

6.5 Section 5 – Locations of stepping motors in the machine
5a SB = Stitch-width stepping motor¨
5b PFP = Presser-foot pressure stepping motor
5c TT = Upper-thread tension stepping motor
5e All stepping motors in pinning position
5f Winder motor
5g SL = Stitch-length stepping motor
Important!
If the main motor isn't running, the machine won't synchronize. With the result that the stepping
motors won't be released.
5a Stitch-width stepping motor
Is used to check stepping motor function
Check:
• Select test 5a.
• Press icon to activate the stepping motor. The colour of
the icon will change to light blue, 'Running' appears,
and the needle bar support moves back and forth.
• Press icon again to stop the stepping motor.
'Successful' appears.
• To return to section 5, press
Repair note:
• If the stepping motor doesn't move, the fault might be
with the motor itself, the wiring or the PCBA-Base.
• Check cables and plugs for deformation and/or wear
and tear.
• Replace PCBA-Base
(see
• Replace stitch-width stepping motor
Important!
Disconnect machine from the power supply.
Do not disconnect or reconnect when the
machine is powered.
BERNINA International AG
.
4.2.4).
(see 4.3.22)
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