Allen & heath xone 92, vcf problem, selfoscillating

[Vicus]

Hi, I have some trouble with a xone 92. Filter 1 self oscillating with resonance set to wild and frequency near to the max. Service manual found here
ALLEN-HEATH XONE 92 SCH Service Manual free download, schematics, eeprom, repair info for electronics
The mixer come with filter 1 not working, I found R71 burned but not broken and the ssm2164 fail. I replace both, now the filter work (not at all) but it self oscillating. Some ideas?

[Vicus]

Found resonance pot in bad shape. Stay tuned.

[austin_tacious]

Found resonance pot in bad shape. Stay tuned.

What was the final verdict? The VCF on both sides of my mixer has turned into a band reject regardless of selected setting and it's going to be around $350 USD to replace the two filter boards. I haven't gotten into the mixer to see if there are a couple of components I could replace. Vicus, what was your final resolution?

[Vicus]

Yep, I did repair it replacing the quad vca that are obsolete and difficult to find. I did pay a lot for money for one and fortunately it did resolve the problem.