[sdiy] Bizarre Xpander Tuning Problem

gm montalbanogm at gmail.com
Tue Aug 10 20:37:09 CEST 2021


I have here an Xpander that will either pass or fail Tune, but will 
always have the VCO 1s in perfect tune & scale, while all six VCO 2s 
will be out of tune & out of scale.

Did the usual replacement of all DAC components, and the ICs involved in 
the tuning routine;  no help.

Am struggling to find what all six VCO 2s have in common that might be 
causing this;  any pointers would be greatly appreciated.

~GMM


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