chrispbass
Well-known member
I've had quite a lot of gear donated recently (in various states of repair) and I'm working through it with very good results. A lot of it has gone on to be used at my GF's youth music project, so nice to see it put to use rather than be scrapped off.
Anyway, I'm trying to sort out the above mixer. The SMPS was faulty, so had to fix that to be able to test the desk. Analogue side of things seems good, auxs/busses, but the master bus has no ouput. The DSP UI is working fine, but after going through the schematics, it seems that the main outs run through this section with a couple of DAC's.
I've atatched the schematics. Basically, on page 6, the outputs run through the 'feedback ferret' which is part of the onboard DSP shown on pages 56-58 and return to the master output section.
I've got signal pre 'feedback ferret' as tested from the output of U46 (page 6).
Jumping to pages 56-8, U1, U2, U3, are working ok giving an output signal, but no signal output from U7-14. The PSU's are ok (p57) but it would seem that the DAC chips U32/U35 are faulty or a perhiperal component issue, or user error!
DACS, are new territory for me, so if anyone has some suggestions reg testing, or perhaps I'm overlooking something obvious, then I'd be very grateful.
Anyway, I'm trying to sort out the above mixer. The SMPS was faulty, so had to fix that to be able to test the desk. Analogue side of things seems good, auxs/busses, but the master bus has no ouput. The DSP UI is working fine, but after going through the schematics, it seems that the main outs run through this section with a couple of DAC's.
I've atatched the schematics. Basically, on page 6, the outputs run through the 'feedback ferret' which is part of the onboard DSP shown on pages 56-58 and return to the master output section.
I've got signal pre 'feedback ferret' as tested from the output of U46 (page 6).
Jumping to pages 56-8, U1, U2, U3, are working ok giving an output signal, but no signal output from U7-14. The PSU's are ok (p57) but it would seem that the DAC chips U32/U35 are faulty or a perhiperal component issue, or user error!
DACS, are new territory for me, so if anyone has some suggestions reg testing, or perhaps I'm overlooking something obvious, then I'd be very grateful.