Hi there, relatively new to the forums but not to the SE/30. I picked up an SE/30 today that has a known issue of a bright white line at startup. Before picking it up I had expected/hoped to look at R19 on the analogue board and swap it straight out with a new component.
What I have found is that more than R19 is likely to be a problem. R18 and R17 and others seem to have extremely low resistances (< 10 ohms). What I would like to do is trace back the issue, but I cannot find any schematics of the analogue board — unlike the well-documented logic board. I have used the apparently similar Mac Plus schematic to get started, but am finding inconsistencies and would like to be certain.
Does anyone have expertise on diagnosing this issue, or knowledge on where to find the schematics/further details on the analogue board?
What I have found is that more than R19 is likely to be a problem. R18 and R17 and others seem to have extremely low resistances (< 10 ohms). What I would like to do is trace back the issue, but I cannot find any schematics of the analogue board — unlike the well-documented logic board. I have used the apparently similar Mac Plus schematic to get started, but am finding inconsistencies and would like to be certain.
Does anyone have expertise on diagnosing this issue, or knowledge on where to find the schematics/further details on the analogue board?