MPA280 QUALITY CONTROL.
We will use a mixer with unbalanced output and a nominal output level of 1V RMS as
the signal source for our tests.
Connect the mixer outputs to the power amplifier inputs. Plug the power amplifier to
mains (check that its specified voltage matches that of mains) and make sure that SP and the
power switch LEDs all light up . Turn up the amplifier output level until the CLIP LEDs light
up. Turn the output level back down and plug the loudspeakers.
Check the sound quality (no distorsions or noises). Check ATT action (ATT travel,
signal cut at their low end, no scratching or clicking noises and correct stereo channel
matching for each one). While the power amplifier is working shake it or throw it on a table to
make sure the output sound goes on playing correctly. Shortcircuit the power amplifier output
and check it goes back to normal operation when you stop shorcircuiting
.
Repeat the same
procedure for the other channel.
