Fbt symbol 12000 User Manual - page 12
11
PROBLEMS AND SOLUTIONS
FLOW DIAGRAM LEGEND
FAULT
TEST
SOLUTION
YES
YES
NO
NO
The power ON
indicator doesn’t
light up
Does another unit
connected to the same
powersocket
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
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
NO
The loudspeaker
output signal
distorted
YES
NO
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
YES
YES
YES
NO
NO
NO
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