Circuit Overview:
The first Multi-Timbral synth. six track sequencer and arpeggiator. Digital control of Curtis CEM3394 'synth on a chip' with nothing particularly surprising I suppose. Single knob data entry and numpad parameter and patch entry.
Service Tips:
These machines auto-tune every 30 minutes. Or you can init the process with hidden function Patch Rec+6 as I recall. Look at the hidden functions before you start work on this machine. There is also a reset proceedure in the manual someone said. I've not had to use this. Notelt's page has general information that includes the other special functions for this machine that are 'hidden' as in not labelled on the panel. Recent repair had a defective DAC which is also a little hard to find.
NOTE ON EPROM versions from Greg Montalbano who took time to investigate my finding that a six trak I sold recently had omni off when it booted:
**OK, here's what I've found with my unit:
**Using version 11, the MIDI mode will be memorized -- if you set it to Omni **off, it will be that way on power up. Works for modes 1, 3 and 4.
**The version 9 you sent is the same one I have. It powers up in mode 1 (omni **on, mono off) -- changes are NOT saved in memory.
**What I find interesting is that NONE of the versions will save the basic **channel -- it always powers up on 3.
--------------Thanks for checking that Greg. I'm totally baffled now by how the one I had booted refusing to acknowledge messages on anything but channel 3. When I get my new burner I'm going to try both versions in my old machine sn.799 and see what it does.
Parts:
I have lots of parts for these. Let me know if you need anything save the DAC and I have a scrap case at the moment even but no knobs.
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