Martin Audio – MA900 Amplifier
E
NGLISH
14
10.1
Troubleshooting
These are typical things to check if you think your amplifier is faulty:
Fault: No output.
If the Signal Present LED (-40dB) is illuminating a signal is entering the amplifier and the likely cause is an
unsecured Speakon speaker connector, or loose termination.
Check also that the VHF protection is not activated. If it is, remove the cause of the possible high frequency
oscillations from the relevant input.
Fault: The amplifier goes into thermal protection when driven at low level.
Check that there is no short circuit present 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 mains voltage is within the amplifier’s operating range, 130-265V @ 230V, and (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. The amplifier then has to be returned 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.
Martin Audio cannot be held responsible for damage or injury as a result of the top cover being removed.
All material © 2007. Martin Audio Ltd. Subject to change without notice.
