Knackerd Nakamichi BX-300

Dear Hive mind,
I am restoring/reapiring a Nakamichi BX300 and need help.
The cam controller that sets the transport to allow play is not allowing the deck to enter play mode. It keeps scrollling all the time. I need to know how to "register" the cam in the correct position.

While doing this I have broken a wire (Arghhh!!!) and now can not find where it broke off. It is a white wire from the connector that also services the wires for the cam switches. Can anyone tell me where it goes please?!
Pictures attached, I hope they help.
The cam motor no longer works since the wire broke, but it is not the power wire, I tried that.
Thank you
 

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This is a cassette deck not a DAT/MDAT digital tape machine so I will move it to analog source. [Edit: Done]

That said you ought to try over on tapeheads. I have restored a number of 3 head cassette machines in the past couple of years, but no Nakamichi gear.