PreSonus ADL 600 - Manual (Page 18)

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ADL 600
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3.5 Troubleshooting
3.5 Troubleshooting
No power.
First make sure your unit is plugged in. If it’s connected to a power conditioner, verify
that the power conditioner is turned on and functioning properly. Check the fuse on
the back panel of the ADL 600. (Be sure to disconnect the power from the ADL 600
before opening the fuse housing.) A blown fuse may look black on the inside or the
wire inside might appear broken, and a very black fuse indicates that something may
have shorted out. Try replacing the fuse with a new one. The ADL 600 uses a 2 Amp
fuse. If the fuse blows again, please contact PreSonus to get your ADL 600 repaired.
Not passing audio.
If the ADL 600 appears to power on but it’s not passing signal (the lights are on but
nobody’s home), first check all the cables connected to your ADL 600 and make
sure that they are working correctly. Also, verify that the Source Select switch is set
to the correct input and that the Gain control is set to provide enough amplitude
for the signal. If you have your ADL 600 connected to a patch bay, try connecting
a source directly to the ADL 600 to rule out a problem with the patch bay.
ADL 600 emits noise when the front panel is tapped.
Tubes can become microphonic over time, which is a fancy way of saying
they can begin to act like a microphone—and not a good one. In this
case, one or more of the tubes will need to be replaced. Contact PreSonus
or a service professional to locate and replace the offending tube.
Hiss.
This is another common indication of a tube in need of replacement. Again, contact
PreSonus or a service professional to locate and replace the offending tube.