Presser-Foot Pressure Stepping Motor - Bernina B 590 Service And Maintenance Manual

4.3.21 Presser-foot pressure stepping motor

See ESD-related note
Disassembly:
• Remove the covers (see 4.1).
• Picture 1 - Unplug stepping motor wire including
PFP connector (red) from PCBA-Base.
• Picture 2 - Remove the two clips d.
• Picture 2 - Unthread stranded wires
(yellow/green/orngae/brown) from the two spiraled
wire bundles, and remove them from the cable
duct.
• Picture 3 - Remove fastening screws (T10) 1 and
2 (M3X6mm).
• Carefully remove stepping motor.
Assembly:
• Picture 3 - Refit stepping motor. Slightly retighten screws
1 and 2.
• Picture 3 - Take care that there is no play between drive
gear pinion and wheel (no play or clamping). Then
retighten screws 1 and 2.
• Picture 2 - Reinsert stranded wires into cable duct and
rethread them into spiraled wire bundles.
• Picture 1 - Replug connector (red) into respective slot
labelled 'PFP/FL red'.
• If nothing else has to be taken care of, refit the covers.
Note:
Since the stepping motors don't have connectors attached to
the motors, they must be replaced fully and including the wires
when wires are damaged.
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