Adastra RM1202 - Schematic

This is still a current model, pro. audio mixer/amp. and supported by Sound Services in the UK, for example. You may get a more helpful response in the PA and line level forum here. Ask the mods to move the post by reporting it. Othewise, have you tried contacting your local distributor if not in the UK? I would not be surprised if they refused to help though - service agents and manufacturers like to keep the work for themselves and according to contracts.
 
This is still a current model, pro. audio mixer/amp. and supported by Sound Services in the UK, for example. You may get a more helpful response in the PA and line level forum here. Ask the mods to move the post by reporting it. Othewise, have you tried contacting your local distributor if not in the UK? I would not be surprised if they refused to help though - service agents and manufacturers like to keep the work for themselves and according to contracts.
Thanks for the advice!
Unfortunately the distributor doesn't help us and doesn't give us the datasheets.
But thanks for the help!