Hi,
Check the line "P24" from the patch CPU (pin35 of IC22 on KLM-367). It
is the clock line for the latches for these signals (Octave, etc.)
"crashes sometimes": perform the "Reset Circuit Adjustment" as given
in the service manual. Check the TAPE ENABLE switch and its line to
the programmer CPU (pin 6 of IC22).
General: check all the lines from programmer CPU (IC22) to IC30/31
(data bus buffers), IC26/24 (adress latches, IC24 is errornously
labeled "IC34" in the schematic), IC32 (RAM), IC28/29 (digital control
latches), IC34/35 (digital control latches), and IC18/19 (analog
demultiplexers). From experience IC31 and IC30 are often affected
from battery acid eat-up, as they are located close to the battery.
Do all checks using an Ohmmeter.
Be patient and insistent - you will fix it and it is worth!
Good luck!
Johannes
analogfuture wrote:
> Hello,
>
> I have spent the better part of the day sifting through old posts to
> this forum, which proved very useful... I suffer from a certain
> degree of phobia and ignorance when it comes to digital circuitry,
> but it looks like I have no choice but to befriend the KLM-367
> somehow, since most everything important goes through there. My first
> analog synth, and the major problem is positively in the digital
> section of it...somehow that doesn't surprise me. Anyway...
>
> A number of people describe problems that (from my memory) I have
> with my Polysix:
>
> -Octave selector not working
> -Waveform selector not working
> -Sub osc. selector not working
> -MG "MOD" selector consistently modulates VCO pitch regardless of
> setting
> -General patch memory problems
>
> In addition, mine some times will "crash", and messing with the
> tape enable/write enable selectors brings it back to life.
>
> It seems common for these malfuctions to be part of the problem of
> a failing KLM-367. Even so, major parts of the analog synth
> (virtually all pots) work okay, so the damage is likely to be
> somewhat limited, at least confined to the 367 board.
>
> Clearly the stock battery in my P6 was replaced before the board
> suffered serious damage, so I have some hope of being able to sort
> this out.
>
> It's going to be a few days before I get an opportunity to get back
> to my shop to work on the machine, so I'll stay tuned here for
> further input and go on reading old posts to prepare me for the
> upcoming job.
>
> Regards to all, from
>
> Thomas/analogfuture
>
>
>
>
>
>
> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
>
> Yahoo! Groups Links
>
> To visit your group on the web, go to:
> http://groups.yahoo.com/group/PolySix/
>
> To unsubscribe from this group, send an email to:
> PolySix-unsubscribe@yahoogroups.com
>
> Your use of Yahoo! Groups is subject to:
> http://docs.yahoo.com/info/terms/
>
>
>
>