Mark Jones wrote:
jabba wrote:
I bought a Index 645 that has a Baldwin DRO on it. This is
an old style with nixie tubes. The DRO has an independent
box for each the X and Y axis. The X axis worked fine, the
Y would not power up. I took it apart and fixed the power
supply to the nixie tubes and then it came on although one of
the nixies is burned out. Unfortunately there is some problem
in the logic chips I assume as the "zero" and "set" buttons do
not work correctly. Is anyone here experienced in fixing these
type of units or know where to get schematics?

Curious here, are the nixies the only tubes present? Some tubes were actually
designed as logic devices and in fact the burned-out nixie could theoretically
affect the device operation. Not that it should have been designed that way
though.

No there's several dozen logic chips.