Opinions on sh101 erratic behavior

[Ken Stone]

I've never looked at a diagram of the beast, but it sounds like you have a
power supply problem. Digital stuff will behave quite erratically if not fed
the correct voltages.  The fault could be the capacitors in the psu, but it
could also be the regulator semiconductors.  If the capacitors are common
and you have some to hand, try swapping them out first.

Get a meter onto the outputs of the supply and watch what the voltages do
during powerup. I suspect they are slowly rising from 0 to 5V? in the
digital portions of the circuit. 

Ken
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                Ken Stone  sasami at blaze.net.au
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