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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 professional 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 now 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
problem then you should send back to the manufacture 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 listen 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 in very high SPL they have
distortion you should take care of them and reduce the output
to the right position.
PKM Series Power Amplifier
The protection light blinks
When the PROT 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 check 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
resistance).
2. If the PROT light always 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.
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, users must know what
will happen if to do in this way. We do not recommend the
floating use.
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.
13/14
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