No Operation Of The Zig-Zag Step Motor; No Operation Of Feed Stepper Motor; The Bobbin Winder Spindle Is In "Off" Position - Pfaff ambition essential 1.0 Service Manual

No operation of the Zig-zag step motor

. Check if the connectors JP1 and JP12 are properly connected to the main board (#1).
If the problem still remains.
Replace the ZigZag Photo sensor board (#2a).
Replace the ZigZag step motor (#2b).
Replace the main board.

No operation of feed stepper motor

. Check if the connectors JP1 and JP11 are properly connected to the main board (#1)
If the problem still remains:
Replace the feed photo-sensor board (#2a).
Replace the feed stepping motor (#2b)
Replace the main board.

The bobbin winder spindle is in "off" position,

Check if the connector JP17 is properly connected to the main board.(#1)
Check if the bobbin winder spindle and microswitch are making proper contact (#2).
Adjustment :
Loosen the two screws that holds the microswitch in place, reposition the micro-switch until it is positioned in
such a way that the bobbin spindle is pressing fully against the switch, tighten the two screws.
If the problem still remains:
Replace the bobbin winder micro-switch (#2)
Replace the main board (#1)
58
Fault fi nding Ambition essential
JP1
1
JP12
JP2
1
1
104 73 15-26
a
2
2
JP11
JP17
2
b
b
a