You need to ask Keran at Arc about it. they seem to have the knowledge of these machines.

Steve.

Not sure if I am talking about the same mill, but long ago I had a small Sieg mill, and had exactly the same failure mode. The control board turned out to be the same as the type then fitted in the chinese mini-lathes – and there has been much discussion of their electronics on this forum.

Eventually I traced the fault to the power devices (not sure now whether they were transistors or power MOSFETS), which had failed. They weren't difficult (then!) to source new devices and replace, and it was considerably cheaper than the 80-odd pounds a replacement board cost at the time. It might be worth looking at your board, and searching this forum for info on the control boards for these chinese lathes and mills.

Suggestions:

• Check obvious like blown fuses (there may be some on the circuit board), detached wires (due to vibration) and any sign of overheated components on the board. Fuses and loose wires are often easy to fix.
• Speed control potentiometers contain a mechanical wiper running over a resistive track that gets dirty, goes intermittent and fails completely. The controller board doesn't get the control voltage that tells it to run the motor. Cure, replace the pot – they're only a few pounds.
• If the motor is often switched on and off at high speed, or the machine has been worked hard, the power MOSFETS may fail. Easy enough to fix if you have electronics skills, soldering iron and some test equipment, much harder if you don't, in which case replace the whole board.
• Early boards were unreliable, later ones are much better.
• Possible a switch has failed – test with a multi-meter.
• Unlikely to be the motor, but it can be tested by wiring it to a 12V car battery.

With luck someone who has details of the X1 board will be along to provide better help.

Can you post some photos of the electronics? How to do it described here.

Also, where are you? There might be a helpful member nearby.

Dave

Edited By SillyOldDuffer on 17/03/2020 15:19:36

Circuit of older machines – might help -its the lathe, but very similar to mill.