KX3 Spindle Problem

[ModelSteamKen]

Hi Folks
Still chasing the problem of having no spindle. I've been working with Aturo at cnc4pc but have had little sucess. The only board that hasn't been replaced is the small AP2 board which lies between the BOB and the main motor board. All the necessary voltages are now coming out of the new BOB to the connections at the board. Does anyone know what this sall board does and if outputs can be tested? Getting new AP2 board being hampered by present world situation.

Thanks
Ken

[JAZZCNC]

I think it is the speed control board, does it have a potentiometer on it.? I think the AP stands for Analog Potentiometer Board.

[Kitwn]

I think it is the speed control board, does it have a potentiometer on it.? I think the AP stands for Analog Potentiometer Board.

The blue thing, top right hand corner of the photo is a trimmer potentiometer, possibly a multi-turn type. The label under it looks like "START/STOP". If you adjust it keep track of how many turns and in which direction so you can put it back where it was.

Edit: Just made time to read Doddy's link. START/STOP is a label on one of the connectors. The potentiometer is for the speed at max control voltage. Pots can become faulty and go high resistance but it's possible to clean the track inside by simply adjusting it up and down a few times. Certainly worth a try for the time it takes.

[dazp1976]

That board looks exactly like little machine shops upgrade board.
Was the machine bought new by you are did you buy it used? Might be the LMS board in there already. Straight swap.