On Tue, 11 Sep 2001
stef@foxall.com.au wrote:
> I have had a Korg Poly6 for many years and loaned it to a mate for
> the last 6 or so years. It came back with the leaky battery problem.
> I have an electronics tech friend who replaced the battery for me and
> also IC's 30 & 31 on the same board. Everything seems to work OK -
> except for it doesnt make any sound at all and I have no LED's up on
> the "KEY ASSIGN MODE" bank. I have found your websites to be very
> helpful so far and would like some help please. Is the problem likely
> to be on the same board as the battery ? If so where and what should
> I be looking for ?
No LEDs for key assign mode means that something is wrong on the KLM-366
voice board. The first thing to check is that all the cable are attached.
Next, by pressing keys there should be small LEDs on the board itself that
light up to indicate which gate circuits are active. If these don't light
then it is very likely the microcontroller on the KLM-366 has failed.
This can be replaced with similar part that, while not factory-programmed
with the necessary code, can be programmed in a standard device programmer
and used on the KLM-366. (The original part is an Intel 8049, the
replacement is Intel 8749, which is an eraseable/programmable version of
the same thing).
It is possible that problems on the KLM-367 (board with the battery) are
interfering with the KLM-366. If there are any traces that were corroded
by the old battery, they'll need to be fixed.
Crow
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