9.
TROUBLESHOOTING
After powered without any response
Measure the outlet with a multimeter to check if
there is power available and when no multimeter,
you can have a test pencil. If the power supply is
normal and the amplifier still no response when
powered then there is something wrong with the
amplifier,need prfessional person to check it.
No signal output
1. Frist check if the signal input is right.
Check the connect of XLR, if the 2 and 3
reverted or the ground is reliable. Different
circuitry design will have different connect way
of the XLR, please follow the 2+
、
3- to soldering.
It can not be judged by comparing with other
amplifiers (including other amplifiers in the
same factory).
2. The signal light don't lights up
If all the signal input is fine and the signal light
don't lights up then may the amplifier has failure,
you need to ask the professional person to
check it.
3. Signal input normal but no sound
The signal light will flash with the change of input
volume, but no sound out, then you can check
the connect of speakon if it is connect good and
the wires are connect right (some times the
problem of the wires connect, check its±
1 and
±2
connect), after the check above if still no sound
out, please change a speaker cable and check
again. Because some times also caused by the
bad quality of the Speakon connector problem of
the amplifier
Through experiences, it may caused by the
bad connection of some plugs and the socket.
Output sound distortion
1. After check the signal and loudspeaker
they are fine and still can hear distortion when
small sound, then may the amplifier has
failure, need professional person to check it.
2. Some frequency band has distortion
First, check if the loudspeaker already
overload, normally judge it in 95~105dB for
higher SPL we don't comment here. Here we
just think about the failure recovery of the
amplifier. If in the middle have some rupture
sound and more smaller volume more
obvious, then it should be crossover distortion
of the amplifier and this kind of distortion is
easy to confuse with the failure of loudspeaker
itself. If the amplifier have for problem then you
should send back to the manufactur for repair.
3. Distortion is High SPL
If the sound is normal when small volume and
then you need to check the limit SPL of the
loudspeaker. You can listn it in suitable volume
and if clip light works, then you need reduce
the output. Both loudspeaker and amplifier
have limit, you should use them in their limit if
The protection light blinks
When the PROTECT light works, the amplifier
into the protection mode.
1. Maybe the temperature is too high or output
short or near short and they are not failure they
can recovery after you can use it normally. But
over heat will take more time to recovery. Also
when over heat happened you should cheak
the fan and the temperature of the install
environment, if does you should solve the
problem then can use amplifier. If you think the
speaker was short, you can with a multimeter
to check if the resist is lower than 2 ohm or 1
ohm with DC (Please calibrate the multimeter
to measure for accuracy because of the small
esistance).
2. If the PROTECT awlays light up then it should
be the problem of amplifier, you should send
it back to professional person for repair.
Hum in the system
1. Hum exists even when there is no signal
Please keep the amplifier away from earth
wire of power supply cables, just connect the
fire wire and zero wire, no ground wire. If the
hum is still existing, it can be judged that there
are some problems in the amplifier. Please
get in touch with professionals.
2. Hum exists when the system is completely
connected This is caused by the different
ground voltages in difference devices in the
system, mainly happens when the power
supply is under three-phase distribution
condition, each device is connected to
different phase. This is not caused by amplifier.
The amplifier is required maintenance in the
condition below:
1. If the amplifier smokes or smells burning.
2. If the cabinet has severe indentation and
deformation.
3. If the amplifier are dipped into the water.
4. If the internal components loosen.
5. If AC breaker skips out when current increases.
in very high SPL they have distortion you should
take care of them and reduce the output to the
right position.
Solution experiences, just for reference
A. Combing the electricity the power distribution
,
box using the same one for all if possible.
B. Make sure the grounding wire potential is zero
and force the different grounding wire to the
same level, if the grounding wire itself charged,
indicates that the wire may be connected with
the zero line. Please solve this problem.
c. If unavailable above, then only to disconnect
the ground wires of all devices, which helps to
reduce the AC. But this is not meet the safe
use of electricity, user s must know what will
happen if to do in this way. We do not
recommend the floating use.
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