If you have a scope, check every signal that connects to the RAM chip.
If you only have a meter, you can check resistance from the RAM signals
to other chips that they hook to. If your battery is socketed, remove it,
and do the ohmmeter checks with the synth powered down of course.
Measuring resistance with a DMM on signals that have voltage on
them doesn't work.
Bob
--------------------------------------------
On Fri, 5/12/17, josh.nursing@gmail.com [PolySix] <PolySix@yahoogroups.com> wrote:
Subject: [PolySix] Patch Recall issue
To: PolySix@yahoogroups.com
Date: Friday, May 12, 2017, 1:08 PM
So after I fixed some grounding issue
yesterday, it seems that my Polysix doesn't recall the
patches: they're all initialised to random,
not-too-usable sounds.
Where
should I look at testing on the boards (KLM-367 at least,
correct?). Any particular chips + traces?
Before my fixes yesterday, I did manage
to briefly recall my own patches internally, so I know the
battery is good, the memory should be good and I'd tend
to think about some bad trace somewhere instead.
Thoughts on how to narrow it down?
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