22 Jul
2012
22 Jul
'12
7:35 p.m.
On 2012 Jul 22, at 2:37 PM, Paul Anderson wrote:
I'm currently working on restoring a NRI 832
computer trainer. I
finally got my oscilloscope on it. It looks like the clock isn't
running. You can see the waveform in this video. I tried both the
fast(250kHz) and slow(2Hz) clock. I'm just seeing noise from the
power supply.
http://www.youtube.com/watch?v=RBV4QgQHq98
From your video, with 0.4V of 120Hz ripple on a clock output, you
might back up and check/measure/scope the power supply, look at
what's going into the regulator and what's coming out.