Dc Protection; Maintenance; Troubleshooting - Lab.gruppen fP Series FP 1150Q User Manual

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There are two types of DC protection:
•
Fuses on the supply branches of each channel.
•
A DC crowbar protection that shorts the output if more than 10 volts DC are being detected on the
outputs.
Either of these protections comes into effect once DC voltage is being detected, independently for both
channels.
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Under normal use the amplifier should provide years of trouble-free service. The only user maintenance
required by the user is to vacuum the front grill periodically.
In some extreme cases it may be necessary for authorized service personnel to clean the inside of the
amplifier. These conditions usually occur after prolonged use, e.g. in environments using "cracked- oil"
smoke machines.
If you are using your amplifier for heavy duty use i.e. concert touring or industrial music it is
recommended that you have your amplifier serviced every 3 years, purely as a preventative measure.
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These are typical things to check if you think your amplifier is faulty:
Fault: No output.
If the Signal Present (-40dB) is illuminating there is nothing wrong with the amplifier; the likely cause
is an unsecured Speakon speaker connector.
Check also that the VHF protection is not activated. If it is, remove possible high frequency oscillations
from the relevant input.
Fault: The amplifier goes into thermal protection when driven at low level.
Check that nothing causes a short circuit at the amplifier's output, e.g. any component in the
loudspeaker (this can occur when the speaker coil gets warm).
Fault: The amplifier goes into protection with power indicators off.
Check that the AC line voltage is within the amplifier's operating range, 130-265V@ 230V, (65-135V
@ 115V). Over/under-voltage protection may have occurred. If the amplifier is connected by mistake to
a 3 phase supply, an internal non-resetable fuse or resistor may have blown. Then return the amplifier to
your supplier for service.
Fault: The amplifier does not respond even after checking above items.
In the unlikely event of on a non-user rectifiable fault, return the amplifier to your supplier or an
approved service centre.
Lab.gruppen cannot be held responsible for damage or injury as a result of the top or bottom
cover being removed.
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