Schematics KDJ11-A / M8192?
holm at freibergnet.de
Tue Sep 8 13:12:20 CDT 2015
Noel Chiappa wrote:
> > From: Holm Tiffe
> > Anyway, thanks for the schematics
> Eh, de nada.
> > I have the board running again. The fix was simple, the xtal was bad.
> You're lucky it was something so simple! (Although we've seen this kind
> of thing before - I had that 11/23 with a bad crystal.)
> I've got three dead 11/73 boards (from someone else), but none of them are
> that easy. Different symptoms on all three, but I suspect the State Sequencer
> gate array on all three. On one, at least, the ILOE latch control signal from
> that gate array is sitting at 2V (which I seem to recall is characteristic of
> a TTL input that's not being driven).
> Maybe it's just some corrosion, and re-seating the gate array (if I can work
> out how to unseat it - don't have the extraction tool) will fix it.
> Otherwise, I'm SOL. At least the J11 there are spares for - that gate array
> is surely umobtainium.
I do have an extraction tool, but was unable to extract the chips
out of the sockets w/o braking one socket... ok soldered in a new one
and put the chips back after cleaning the pins with a glass hair brush..
There is a german company that saves chips from old pcb's, If you are sure
that you need a chip, try to search the numbers in ther database:
I found at least the gate array type..
Search for all numbers, not only the "real" type.
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