"In the last few years I’ve had several dual voice boards (DVB) to repair, and to use a genuine Chroma as a test bench isn’t a good idea: plug and unplug, switch on and off and back on ... all tasks that can impact on an old instrument, even potentially damaging it in several ways.
Moreover, the diagnosis of DVB faults on the Chroma isn’t that easy, because of the auto-tune software that drives the voice boards in a proper manner, forcing the engineer to take counter-measures to understand what the fault is.
The late David Hillel Wilson's Voice Board Test Controller documentation is unfortunately limited to the control panel, the schematic diagram and a few waveforms; there no assembly details at all (except for the case)..."
Related: See this post on David's voice tester, and this post on his passing.
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