Presser-Foot Pressure Stepping Motor; Upper-Thread Tension Stepping Motor - Bernina B 590 Service And Maintenance Manual

5b Presser-foot pressure stepping motor
Is used to check presser foot pressure stepping motor function
Check:
• Select test 5b.
• Press icon to activate the stepping
colour of the icon will change to light
'Running' appears, and the presser-foot
and down.
• Press icon again to stop the stepping
'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 presser-foot pressure stepping motor
Important!
Disconnect machine from the power supply.
Do not disconnect or reconnect when the machine is powered.
5c Upper-thread tension stepping motor
Is used to check upper thread tension stepping motor function
Check:
• Select test 5b.
• Press icon to activate the stepping motor. The colour of
the icon will change to light blue, 'Running' appears,
and the upper-thread tension unit 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 upper-thread tension 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
.
4.2.4).
(see
Seestrasse 161 CH-8266 Steckborn
DRAFT – VERSION
4.3.21)
4.3.17)
Schweiz
motor. The
blue,
bar moves up
motor.
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