Right , So??
Circuit here and I will expand on my issues .
Please remember i am of the mechanical rather than electrical persuasion so Wiring diagrams are not part of my native language .

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The spindle encoder Plugs into the processor board (highlighted red ) where I presume magical and mysterious things happen to the input , before it is sent on to the drive board .
RL1 (brown) which is integral then seems to shuffle things in a manner I cant yet get my head around via the forward / reverse (green box) and Latch /unlatch (blue box) which I am presuming is controlling the big grey external relay RL3 for spindle direction

So the function of the spindle seems to be dependent upon both boards ????
How can I chuck them out?