I have a 12v PICA board , the motor is a 0.9 /step driven by an A4988 the three DIP switches underneath are all set to ON. I think this means 16 micro-steps is enabled. I measured Vref at 1.24 volts on the original driver. I found that I had a spare driver and installed it. Vref on it is 0.880v. Still no motor power.
The motor was supplied to me by an E3D dealer here in Canada.
It is a Motech motor and looks to be genuine E3D kit.
I did have the correct Estep setting at +837 as Ant0ny suggested. I measured the motor coil resistances at 2.8 ohms which includes the resistance of the connecting cable , I bought the cable direct from the E3D store.
I have extra cables and I have swapped out the cable to no effect.
I plugged in the original direct drive extruder and the motor in it spins happily with the pinch roller engaged.
I’m leaning towards the idea that the E3D slimline motor is a bad one.
I think my next step is to swap it out.
I will report my progress (or lack of it) here…