PreSonus ADL 700 - Manual (Page 27)

4.4 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 700. (Be sure to disconnect the power
from the ADL 700 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 700 uses a 500 mA/250V time-delay fuse for 100-120
VAC systems or a 250 mA/250V time-delay fuse for 220-240 VAC systems. If the
fuse blows again, please contact PreSonus to get your ADL 700 repaired.
Not passing audio.
If the ADL 700 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 700 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 and Output Level controls are set to provide enough
amplitude for the signal. If you have your ADL 700 connected to a patch bay, try
connecting a source directly to the ADL 700 to rule out a problem with the patch bay.
ADL 700 emits noise when the front panel is tapped.
Tubes can become microphonic over time, which is a fancy way of say they
can begin to act like microphone—and not a good one. In this case, one or
more of the tubes will need to be replaced. You’ll need to 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.
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4 Resources
4.4 Troubleshooting
ADL 700
Owner’s Manual