[sdiy] Siel Cruise problem: how to fix?

[Rutger Vlek]

Hello,

recently i bought a Siel Cruise synthesizer (and with it alot of dust :)). I 
cleaned it completely, and it sounds great now, but i'm still having some 
problems with the Poly Section.

This section contains 4 buttons to choose "Brass, Strings, Organ, Piano". 
Each instrument group (ie. piano) has some flipswitches to choose the kind 
of piano (clavichord, piano, etc). The strange thing i'm experiencing is 
about the last 2 groups of instruments (Organ and Piano). At certain 
settings of the filpswitches of those instrument groups (i.e the Organ 
group) i cannot select the Piano group. When i flip the switch in this organ 
group off suddenly the piano group automatticaly is activated, and the organ 
group is deactivated for a couple of seconds...after a while it swells on 
again together with the piano. So something is going wrong in the flipswitch 
and group controls but i can't find out what the problem is.

Another problem i am experiencing is that the release-time on the polyphonic 
section is extremely high and (sometimes) won't respond to the release 
slider. The only way to cut the ongoing notes is via an external pedal on 
the "poly decay" input. This happens on ALL the keys (so it's not a keyboard 
problem i think, but more of a control problem).

The last problem i have is (and perhaps has to do with the release problem) 
is when i switch of the poly section or split it is not shut down 
(sometimes...). It just goes on...

Does anyone have any clue where to look? I checked all the sliders and 
switches if the function properly, and they do. I checked the print visually 
and corrected an earlier repair that was done very messy. I checked this 
repair using a multimeter to ensure that the connections were ok. Everything 
else looks ok. Where do i look?

Perhaps someone with experience with the Cruise has an answer? Or someone 
with the service manual :).

Best regards and thanks in advance,

Rutger

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