Control 24: Preamps not working and Peak leds are lit at all times
I recently bought a Control 24 and its preamps don't work.
Peak led is always lit red, from the moment I turn the console on. There's very low signal coming into Pro Tools from the channels I try to record. I mean... I can see very low signal but not hear a thing. I live in an island in Portugal and there are no techs available. I really need some help to try to sort this out on my own. PS: If I disconnect TB6 or TB7 (connections for the mic preamps sub-regulator board I believe) from the power supply the Peak leds come to normal (they are not lit anymore) but now there's excessive weird noise from the moment I turn the console on. PS2: C20 capacitor was already exchanged but nothing changed. Does anyone have experienced these symptoms before? I'd be much appreciated for any help. All the best, André |
Re: Control 24: Preamps not working and Peak leds are lit at all times
Update:
It seems that the culprit is the sub-regulator board for the preamps. Disconnecting this board and connecting the rails directly to the PSU puts it to work, with what seems to be a normal noise floor. On the sub-regulator board, for each harness it reads GRD 10V -10V 10V -2V. This last value seems off to me. When connected directly to the PSU, the last value is -10V. Does anyone know what's the actual function for this sub-regulator board? Lowering the noise floor for the preamps is my guess but I don't really know. Will I be damaging the preamp cards running the power directly for the PSU without passing through this sub-regulator board? To my knowledge, information about this is non-existent on any of Digi's websites. Btw, the regulators on the sub-regulator board are: 1x LT1963A and 2x LT1175. LT1963A: http://cds.linear.com/docs/Datasheet/1963afe.pdf LT1175: http://cds.linear.com/docs/Datasheet/1175ff.pdf |
Re: Control 24: Preamps not working and Peak leds are lit at all times
I have the same prob on channels 1-8 but fortunately I don't use the inputs just for a controller. I do have noise in my headphone mix because of this. Were you able to fix the problem? I am thinking of just disconnecting from PSU.
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