The main problem with the DK 600 (other than the fact that it's a Siel) is the NiCd memory backup battery, which leaks onto the CPU board (like in the Polysix). So the first thing you'll want to do is check out the CPU board (under the keyboard) and see what's going on under there. In anticipation of fixing mine, I've analyzed the problems that a leaky battery can cause, depending on what chips are affected. If IC15 or IC16 are bad, the front panel buttons and/or tape dump won't work (IC15 buffers panel inputs, IC16 buffers the tape dump in/out and the front panel "data available" interrupt signal). IC20 controls waveform selection. IC28 and IC29 control display blanking and the "Enter" LED. I don't know what would cause the knobs to not work- check TP8 (multiplexed knob readings). There also should be LEDs on the voice board connected to gate signals, so you can see if the voices are being properly triggered.
To: vintagesynthrepair@yahoogroups.com
From: cockandswan@...
Date: Sat, 1 Mar 2008 03:26:56 +0000
Subject: [vintagesynthrepair] siel dk-600
hey, i just got a siel dk-600 which i am excited about. it's different
than the older synths i've been working on but i thought i'd see if
anyone else has any experience trouble shooting these.
problems:
it powers up but there's no sound and no response form the
buttons/nobs. one of the LEDs is burned out too. i'm hoping that since
all the nobs and buttons are non-functional that there is some master
routing for the controls that has gone bad. any ideas? how about led
replacements?
thanks for all your help guys!
-johnny
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