21
Chapter 7
Maintenance
Under normal use, the amplifier should provide years of trouble-free service. In some extreme
cases, however, it may be necessary for authorised 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, e.g., concert touring or industrial music,
it is recommended that you have your amplifier serviced every 3 years, purely as a preventative
measure.
7.1 Troubleshooting
Typical things to check if you think your amplifier is faulty are:
• Fault – No output
If Signal Present (–25 dB) is illuminated, 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, 130–265 V
(65–135 V @ 115V). Over/under-voltage protection may have occurred. If the amplifier
is connected by mistake to a 3-phase supply (415V), an internal non-resettable fuse
may have blown. Then return the amplifier to your supplier for service
• Fault – The amplifier does not respond even after checking the above possibilities
In the unlikely event of on a non-user rectifiable fault, return the amplifier to your
supplier or an approved service centre.
Brüel& Kjær cannot be held responsible for damage or injury as a result of the top cover
being removed by unqualified personnel.
BE169212.book Page 21 Tuesday, January 23, 2007 9:00 AM
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