6 Maximum Speed Regulation; 7 Stepping Motor Test Stitch Width - Bernina activa 125 Service Manual

16 Test Programmes
Test No. 6 Maximum speed equalisation (Service Panel)
What is to be tested
Maximum speed equalisation
(s.p.m. = stitch/minute)
The speed is set automatically
10
1
10 s.p.m. (10–90)
2
10 s.p.m. (100–900)
Test No. 7 Stepping motor stitch width (Service Panel)
What is to be tested
Step motor and S-print
Stitch width bar blinks
If the step motor does not rotate
then the fault can lie either with the
step motor or S-print. The faulty
components can be identified by
swapping the connections of the step
motors.
What to adjust
Select service programme No. 6.
0 s.p.m. (1–9)
What to adjust
Select service programme No. 7.
Warning: Disconnect
from the electricity
supply!
Normal condition
Press foot control until «ok» appears
on the screen.The maximum speed
appears on the screen. Used for
example after disassembly /assembly
operation to compensate the
machine's software.
If an F (Fault) appears then there is
something jamming.
In test No. 11 the speed compensati-
on factor can be read-off.The smoo-
thness of running for all shafts must
be
Normal condition
The step motor rotates back and
forth, the needle bar must move to