Ecler PAM1400, Service Manual

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PROFESSIONAL PAM SERIES - QUALITY CONTROL
We will use a mixer with balanced output -if possible- and a nominal output level of 1V as the signal
source for test purposes.
Connect the mixer outputs to the power amplifier inputs. Plug the power amplifier to mains (make sure its
specified voltage matches that of mains) and make sure that PROTECT, ON and SIGNAL PRESENT LEDs all
light up when you turn on the amplifier by pushing the ON button. Turn up the mixer output level untill the CLIP
LEDs light up on the power amplifier. Turn down the mixer output and connect the loudspeakers.
Make an exhaustive test of:
- Sound quality (no distorsions or noises)
- Faders action (fader travel, signal cut at their low end, no scratching or clicking noises and correct stereo
channel for each one).
- Cooling fan operation.
- While the power amplifier is working shake it or throw it a table to make sure the output sound goes on playing
correctly.
- Shortcircuit the power amplifier output and make sure the corresponding channel's PROTECT LED lights up,
the relay opens and the output signal is cut for a short period of time (STAND BY) and returned back into normal
operation. Repeat the same procedure four times more and then the STAND BY time should be about 5 minutes.
Repeat the same steps for the other channel.