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Vintage Synth Repair

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Re: [vintagesynthrepair] Re: Save a Kurzweil K2000R from being shot

2010-11-26 by Arto Koivisto

> I put it on 3 again (before even consulting with you guys) which didn't seem to have an effect.

Don't forget to test enabling/disabling SCSI termination. Theoretically 
(up to SCSI spec), the first and last units in the chain should (afaik) 
be terminated to dampen signals from "echoing" back and forth in the chain.

The first unit in the chain is the controller and this is usually 
auto-terminated, but you should verify if there's anything mentioned 
about this in the Kurzweil manual. As for the last unit in the chain, 
internal drives have a termination jumper whereas external drives 
usually require a separate terminator plug (some might even have a 
jumper/DIP-switch).

Then again, based on my own experiences, SCSI termination seems a bit of 
a black art. I've spent countless hours fiddling with Akai samplers and 
various SCSI units; sometimes the chain has worked when terminated and 
sometimes the termination has just somehow "disabled" it. Heck, 
sometimes the chain has even worked when termination has been enabled 
somewhere in the middle of the chain :)

Anyway, one to check for. Setting different IDs for the units in the 
SCSI chain is nevertheless the most important bit!

.Arto.
-- 
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