FBT SA 2500 - Manual (Page 12)

ENGLISH ENGLISH
PROBLEMS AND SOLUTIONS
11
FLOW DIAGRAM LEGEND
FAULT TEST SOLUTION
The loudspeakers
have a
background hum
Is the
GROUND LIFT
selector in the OFF
position?
Set the selector at ON
to avoid dangerous
ground loops
Avoid installation close to
electrical equipment which from
strong magnetic fields
(dimmers, transformers, etc.)
and use well screened (and if
possible balanced) connector
cables
YES
YES
YES YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
The loudspeaker
output signal
distorted
Is the CLIP led lit red?
There’s an external problem.
Check the quality of the
signal directly at the
audio source
The signal being fed into the
amplifier must be lowered.
The volume controls enable the
input signal to be set at an
ideal level, indicated by the green
colour of the CLIP led
No sounds come
from the
loudspeakers and
PROTECT led is red
Is the amplifier
very hot?
Switching the amplifier
off and on again after a few minutes
does the fault still
occur?
A momentary overload has
occurred which has tripped
the protection devices
Are the front panels air
vents and the fans’ outlets
free from all
obstacles?
The heat produced by the power circuits
is dispersed by the fans, which take
in air through the vents on the front
panel and sent it out
through rear panel
The amplifier’s final stages
have burnt out.
Contact an authorized
assistance centre
When the final stage reach
excessively high temperatures the
electronic protections trip, putting
the system on standby
The power ON
indicator doesn’t
light up
Does another unit
connected to the same power
socket switch on?
Check the socket’s
switches and electrical
connections
Has the fuse
on the rear panel
blown?
Contact an
authorized service
centre
Replace with
a new fuse