MACKIE ONYX 1640i - No signal on Left Main Out

[xaruto]

Hello!
Just acquired Mackie's Onyx 1640i and when testing channels i noticed that i don't have signal in my left monitor.
(plugged a microfone to a channel and when i turn pan knob to the left i lose sound).

Already checked cable connection but i have no signal in the mixer's left main outs.
Tried assigning it either to MAIN MIX either SUB-GROUPS.

I'm sure it's something simple but i can't figure it out.
Any ideia?

Mario Raposo

 

[Brenton]

Cracked solder joints, bad output jack, bad/swollen capacitors, bad resistors, could be anything really. Pop off the cover and check it out.

Just be careful not to knock off any traces on the board, they come off easily.