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focusrite isa 428 won't switch inputs anymore! Multi-Channel Preamps
Old 16th September 2011
  #1
Here for the gear
 

focusrite isa 428 won't switch inputs anymore!

hi! have a focusrite ISA 428 (first gen) and recently the front input select button on all 4 channels stopped working. the pre powers up w/ mic input already selected, and all the buttons light up and function when i switch to line/inst, but the pre itself isn't actually switching the input inside. (and i don't hear the obvious "click" noise of the ISA switching input paths anymore). so basically no matter which input I select w the front buttons, mic is always stuck on for all 4 chan and i cant switch out of it.

sounds like a digital switch or controller is bad between the front panel and the pre itself. all the lights and VU's work. also- i used to have the ADC card installed but it made too much heat. i noticed some bulging caps on it too. i noticed the issue started while the ADC installed, then again 3-4 times randomly without it. however the ISA would be fine after a day... seems like it's not going to come back to life this time!

anyone have an idea??

thanks!!!
Old 16th September 2011
  #2
Does it pass signal?

Many of us have had issues with the ISA428 overheating, which can cause all sorts of problems.
Old 16th September 2011
  #3
Lives for gear
 

There's enough complexity in there I'm sure you'll have to send it in for repair.
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