My Mac Classic's screen shrinks and jitters a bit when there's disk access. Lately, the hard drive has been spinning up for a few moments when first powered on, but soon gives out. When I remove the memory expansion card, the hard drive is fine, but I don't have enough RAM to boot into System 7.1.
I think that the problem is low voltage coming from the power supply.
I measured the +5 and +12 lines from the floppy disk port. My multimeter is analog, so I couldn't get a precise reading, but the +5 looked like it was just above 4 volts, and likewise, +12 looked like it was around 11.
My question: what should I be looking at or adjusting on the analog board?
I think that the problem is low voltage coming from the power supply.
I measured the +5 and +12 lines from the floppy disk port. My multimeter is analog, so I couldn't get a precise reading, but the +5 looked like it was just above 4 volts, and likewise, +12 looked like it was around 11.
My question: what should I be looking at or adjusting on the analog board?