hi
Ah vintage bikes ,positive earth, 6v and electrics from lucas the prince of darkness.

Have you tried pressing the manual mode switch, then trying the axis moves ,i seem to remember mine having to have the manual button switched on before i got responce.

Had a quick think, the fwd reverse buttons are dual purpose, in if you press forward then it starts in forward, the fwd button speeds up and the rev button slows down. have you tried,
reset lathe, press rev button then press fwd it should revers and speed up. (sorry had to ask as it's difficult to troubleshoot remotely) :) .

can you also switch the lathe off, switch the red lever on the relay to the other position(rev). then power up the lathe
when you press the reset switch the relay should switch bact to the other side. (if you look at the diagram i posted you will see that the way the 2 relays on board connecting to pins ,12, 13, 14 will make the relay default to one position on power up


You can check the operation of rl3 quite easily, disconnect the machine from the mains, disconnect the board cable( connector 8) board cable.
if you have a power supply simply connect pin 12 to positive voltage then put negative lead to pin13,the relay should clunk, next put the positive lead to pin 14, again negative lead to pin13 and it should switchover.

If you don't have a supply you can briefly short pins 12 to pin 13, then short pins 14 to 13 (the relay should switch over). Be aware that pins 1,2,3,6 and 7 are at mains potential so stay away.


Can you post a close up of the ribbon connector and its terminal block, one of the board under the control panel, and one of the optoisolater board connected to the lenze controller.

Let us know how you get on