sfluter
New member
I finally pulled a couple of spare boards out to see if I can get them up and running and ran into issues straight away with the first one. First off, it is missing the 1J2 header and the 5114 ram at 1C, so I am assuming the memory protect interlock and bookkeeping are disabled. Not sure if this has an effect on the problems with this board, so I will continue.
The screen only displays vertical lines, red most visible. It shows 1-3-1 error, and strangest to me is that the +12vdc on all of the 4116's shows as -1.2vdc. This is also true at the header. Basically as soon as I power up it takes out my +12vdc reg. If I unhook 1J1 and turn the power back on I get +12vdc back where it belongs.
I have gone through as many posts as I can to get a starting point, but can't seem to find any on this topic. Am I correct in assuming the only place on the cpu that uses +12vdc is for the 4116's?
The screen only displays vertical lines, red most visible. It shows 1-3-1 error, and strangest to me is that the +12vdc on all of the 4116's shows as -1.2vdc. This is also true at the header. Basically as soon as I power up it takes out my +12vdc reg. If I unhook 1J1 and turn the power back on I get +12vdc back where it belongs.
I have gone through as many posts as I can to get a starting point, but can't seem to find any on this topic. Am I correct in assuming the only place on the cpu that uses +12vdc is for the 4116's?
