Schema elettrico fx16ii - Soundcraft FX16ii 16Channel Audio Mixer

Contact Soundcraft at this link for the nearest repair center-

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The CR outputs are tied to the mains, so it looks like a couple of resistors here is a snip of the rear output board

Your best bet is to contact Souncraft customer service. Here's the link-
Technical Support

Try going to the Soundcraft website. There are downloadable diagrams there. Try the link:
http://soundcraft.com.s3.amazonaws.com/downloads/brochures/Compact-Range-Bro-1110.pdf

The best bet is sto contact Soundcraft and request the info you need. Here is a link to the support dept.

Try this...

http://www.samsontech.com/site_media/legacy_docs/dB300_OM_5L_v1_2.pdf

If you look at the signal flow diagram in your user manual, you will see that while AUX 1 and 2 can be selected are PRE or POST fader, AUX 3 is POST fader only... this means that the channel faders control the AUX3 level as well as the aux out level. Make sure you use TRS balanced lines to your speakers and not TS cables.

I answered another post of this earlier. The AUX3 is strictly POST FADER... you MUST turn the channel sliding fader up to send signal to AUX 3. Also the AUX3 channel gain KNOB must be turned up. Also the AUX master gain KNOB must be turned up. Make sure your cablles are balanced TRS cables from the mixer to the powered speakers.

From your description, I think yours is the Spirit FX16. You can download the manual here, which will help.Here's what the manual says about those buttons:



The manual has a good detailed block diagram of signal flow, as well as lots of hookup information. It should clear up the mystery for you.