Left channel out (by 3 users)

Does it have any mechanical pots? balance pots? check all the mechanical stuff first maybe the balance pot has a bad connection or somthing. Any slider controls? check them also

There are NO mechanical pots on the system. The "pots" for volume are a special bitsequence comparator, and the signal for the gain on the amp is a modulated matrix signal.

The most common problem for this kind of amps are the safety-thermal switch... They are normally located really close to the output for the speakers. Normally gray or black boxes (30x10x40mm). Flick your finger on them with volume at 9 o'clock...

If you can hear a click, and the sound appear again you've found the sollution.

NOTE! Hazardous currents are present inside the cabinet, mind your fingers, arms and other bodyparts.