hifi engine

Akai GX-625 reel to reel operating buttons don't work.

The reel to reel can be set to auto turn on and play. The tape automatically returns to 0 on digital display and rewind button lights then goes into play and play button lights.
However, except for operating in timer mode, the motion buttons (including stop) don't operate or lite.
Any help is appreciated.
(unit doesn't require a dummy remote control plug)