Troubleshooting - PRESONUS Eris E44 Owner's Manual

4 Resources
4.2

Troubleshooting

4.2 Troubleshooting
14
No Power. First ensure that your Eris E44/E66 is plugged
in. If it's connected to a power conditioner, verify that
the power conditioner is turned on and functioning.
If problem still exists, disconnect the power cable from your
E44/E66 and check the fuse on the back panel of your E44/
E66. The fuse housing is located directly beneath the IEC
power cable connection. A blown fuse may look black on
the inside or the wire inside might appear broken. A very
black fuse is a sign that something may have shorted out. Try
replacing the fuse with a new one. The type of fuse needed
for your monitor is listed below the power inlet. Be sure to use
the correct fuse for the set input-power voltage. If the fuse
blows again, you will need to contact PreSonus for a repair.
No audio. If your Eris E44/E66 appears to power on but
you hear no sound when playing audio from your audio
source (the lights are on but nobody's home), first make
sure that the cable connecting your audio source to the
monitor is working correctly. Also, verify that the Input Gain
control is set to provide enough amplitude for the signal.
Hum. Usually, hum is caused by a ground loop. Verify
that all audio equipment is connected to the same
power source. If you are not using a power conditioner,
we highly recommend that you add one. Not only will
this help to minimize hum, it will better protect your
equipment from power surges, brownouts, etc.
Use balanced cables whenever possible. If your
audio device does not offer a balanced output, you
can connect it to a direct box, which will provide
a ground-lift switch and a balanced output.
Finally, make sure that your audio cables are not run near
power cables, and use cables that are the appropriate length
for your application. Using cables that are too long not
only increases the risk of noise, it increases the likelihood
that the cables are coiled, which will essentially create an
antenna that picks up all kinds of audio interference.
Eris™ Series E5 and E8
Owner's Manual