there are two centre tapped windings – the centre tap is the 2 joined solder blobs but the centre tap is not brought out to the 4 pin connector – check each winding for continuity but I suspect unless there is obvious signs of distress in the stepper, any fault is likely to be in the driver circuit which is generally not easily repairable – replacement boards are sometimes available but as John says unless the fault is a simple one of a cable connector coming loose then you will probably need buy another printer

Holding the motor in one hand whilst turning the axle, you should feel a distinct bumpy action as the coils pass the magnet. These motors make good generators so a multimeter on a low VDC setting should kick on both coils as the armature is turned.

But I agree with John and Frances – the motor is unlikely to be faulty. If you fancy a punt, they can be found on uk ebay today about £12.

More likely it's the sensor or board though. As inexpensive printers aren't meant to be repaired, usually cheaper to replace the printer unless it's something simple and obvious.

Dave

usually cheaper to replace the printer unless it's something simple and obvious.

Most certainly the case if a relatively cheap domestic ink-jet, but this will be a bit more expensive (particularly if it is a colour printer), so possibly worthwhile?