I have a dedicated cab that has a Sanwa 29PFX CRT in it. It will not degauss, either by pressing the DEMAG button on the SEGA VTS credit board (behind coin accceptor), or by pressing DEGAUSS on the small control board that is directly attached to the monitor chassis..?
The small board also contains 'function', 'up' and 'down' buttons. None of them seem to do anything..