[time-nuts] SRS PRS10 repair

Bob Camp kb8tq at n1k.org
Fri Aug 21 21:40:15 EDT 2015


On any microprocessor based gizmo, getting the micro running (again) is 
generally priority number one. It sets everything up and gives you the diagnostic 
info you need to go further. Garbled serial is better than none at all. It suggests
something short of a total MCU death spiral …


> On Aug 21, 2015, at 7:26 PM, Brian M <brayniac at gmail.com> wrote:
> Dear list -
> I have come into possession of a for parts prs 10. I'd like to try to
> repair this device. What I've noticed so far. Serial is garbled. (Even at
> varying baud rates). Lamp isn't lit. Doesn't look great. I'd like to know
> if anybody else has wandered down this path. What are common failure modes?
> Anything match up with what I describe? Voltages to check would be helpful.
> The 10MHz out looked okay on a scope. Haven't gone further yet. I suspect
> the crystal is fine.
> Thanks in advance. Happy hacking!
> - Brian
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