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10. Troubleshooting
10. Troubleshooting
No sound, no power
(Usually an indication of a power supply problem, either in
the power line itself or the amplifier's power supply.) (Usually
signal-source, bad cable or partial output short circuit related.)
Power on, low output or no output
(Usually signal-source, bad cable or partial output short
circuit related.)
Playback mixed with hum
Distortion
(Usually caused by excessive loss in the input controls when
the mixer/ equalizer/crossover does not produce enough
output. Also caused by overdriving that results in output
clipping, or current limiting caused by excessively low load
impedances.)
Unnatural sound
(Some parts of the frequency bands do not sound balanced
with the rest of the bands.)
Protection mode (amplifier channel or PSU went into
protection mode due to activated protection circuitry)
14
Please use below table before contacting an authorized Service Center.
Problem
Possible solution
• Turn the amplifier power OFF and ON again.
• AC power cord and 48 V input are disconnected.
• Poor fit between the plug and AC receptacle and/or
48 V connection. Try other receptacles.
• Power off at AC receptacle & DC battery low. Check with
Voltage tester.
• Blown amplifier fuse. Replace fuse.
• Protection mode. Allow amplifier to cool.
• Input level controls set too low. Check and reset at source,
pre-amp or gain control.
• Check to see if problem is at the source. Move the input
connections to another amplifier you know is working.
• Be sure that there are no small strands of wire touching similar
strands coming from the other wire in the cable.
• Make sure the speakers are functioning correctly.
• If you are operating in bridged mode, make sure the Mode
Switch is set correctly.
• Use a voltmeter to determine if the power line voltage is
dropping excessively when the amplifier is driven hard.
• Check or replace the connecting cables.
• Make sure that each screw terminal connection is tight.
• Signal cables may have been routed too closely to AC cables,
power transformers, motors or other EMI inducing device.
• Connect another source to the power amplifier inputs.
• If the hum stops, the problem lies with the original
source component.
• Make sure no ground loops are created between connections of
different devices in the system.
• Input level controls set too high. Check and reset.
• Check speaker connections and verify that all screw
connections are tight and that there are no stray strands of
wire to cause short circuits.
• Verify that the total load impedance presented to the amplifier
is within the limits described in this manual.
• Check the EQ cards. Verify that the EQ card corresponds to the
model speaker being used and that the EQ card is installed
in the proper channel socket. Verify that the speakers are
connected to the same channel that the corresponding EQ card
is installed in (see also chapter 'Loudspeaker equalization').
• Make sure the connected speaker lines are not creating a short
circuit – if so: remove short circuit.
• Amplifiers channels / PSU overheated – wait a few minutes to
let the amplifier channel(s)/PSU cool down, they will re-enter
operating state when temperature is reduced.
• Make sure input voltages are not exceeding the max.
specifications.
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