RickNel
Veteran Member
I'm checking the power rail voltages on an early Macintosh (512k).
With a digital multimeter, the voltages check out well within spec - 4.9vdc and 12.2vdc.
However, with an oscilloscope, the voltages look like about 3.5vd and 8vdc. There is a small amount of visible ripple within about .2vdc.
Could this point to a caps problem in the PSU (what Apple calls the analog board)?
I haven't seen a discrepancy like this before....
Rick
With a digital multimeter, the voltages check out well within spec - 4.9vdc and 12.2vdc.
However, with an oscilloscope, the voltages look like about 3.5vd and 8vdc. There is a small amount of visible ripple within about .2vdc.
Could this point to a caps problem in the PSU (what Apple calls the analog board)?
I haven't seen a discrepancy like this before....
Rick