From your symptoms I would guess that the fault lies in the KLM-367 CPU
board. It is the only place where memory problems & front panels LEDs
are both controlled. If the problems started after it was bumped it
could be a connector issue or you could try taking the cpu out of the
socket and replacing it again in case it has a bad connection. It would
be a rare P6 if it doesn't have some sort of corrosion problem on the
CPU board and your jolt might have worsened an existing track problem.
The most common parts to fail first are the data buffers (IC30&31) and
the memory chip (IC32) as these are both closest to the battery. Your
LED and memory problems could both be caused by this. DB3 being stuck
high would cause the led problem for example.
MH
On 1/02/2013 9:39 p.m., ammerman.sean wrote:
>
> Hey everyone, I have a Polysix that that is experiencing patch memory
> problems. It was bumped a little too hard during a gig. I don't know
> if this is what caused the malfunction or not. Anyway, here's the
> specific issue:
>
> When you turn the keyboard on, bank "D" and program "4" are
> automatically selected. Originally, bank "A" and program "1" would be
> illuminated when you turned it on.
>
> When you select other banks and programs, the buttons for "D" and "4"
> always stay illuminated. So if you choose another bank, it will be
> illuminated along with "D." The same goes for when you choose another
> program -- "4" always stays lit. To get a better idea of what I mean,
> check out a pic: http://seanammerman.wordpress.com/?attachment_id=445
>
> Program button "8" does not work and will not illuminate when you
> press it.
>
> The keyboard powers up and produces sound; however, all my saved
> patches are gone. The current sounds are a bit harsh and generic, but
> they are somewhat "musical." After selecting the "manual" patch, you
> can edit and create new sounds like usual. It seems that all the
> effects/MG/VCO etc. are working fine.
>
> Unfortunately, the keyboard will no longer save any of my "found"
> patches. I tried to load patches that I saved to a cassette, but this
> does not work either. Remember, bank "D" and program "4" always stay
> selected. "D" is also the error/cancel indicator for the tape enable.
>
> I disconnected the The KLM-371 board and it looks OK to me. Here's a
> few pics:
> http://seanammerman.wordpress.com/?attachment_id=451
> http://seanammerman.wordpress.com/?attachment_id=452
> http://seanammerman.wordpress.com/?attachment_id=453
>
> I took it to a local keyboard repair tech, but he wasn't experienced
> with analog/vintage synths. He was able to determine that the
> battery(which has been replaced) was working fine. To my eyes, I don't
> see any corrosion from leakage.
>
> Does anyone have any idea what's causing the issue? I appreciate any
> help, advice or thoughts. I am a bit of an amateur, but I love this
> thing and would hate to see it go.
>
>
--
Kind Regards<br>
Murray<br>
murray@paintingwithsound.co.nz<br>
www.paintingwithsound.co.nz<br>
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