color adustments do only one at time (sony pvm-8220)

I got this sony pvm-8220 from a thrift shop and it was only black and
white when setup. There are two set of RGB adjustments in the back
that is easily accessible. But any adjustments results in either a
red, blue or green picture. (red and white, or blue and white and
etc.) Neither the tint or color knobs have any affects either while
the others work. I don,t know if this is a simple issue or complex
enough to end up in a thrift shop. That would be a start for me.

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