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problems with my old 4 switch


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Need some help guys, I dusted off my old 4 switch from its 20+ year slumber only to find out that it does not work properly. When I turn it on, sometimes there is a red screen or sometimes just a black creen when it is powered up. I want to try and fix it instead of getting another one from ebay. I replaced the tia, riot and 6507 with tested working ones and I was getting the same results. After some probing I noticed that about 4 of the data lines had a very low voltage. It did not seem like the lines had a short and there was some voltage. What could possibly cause this?


Dont want to see this one go; any suggestions would be greatly appreciated.

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