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MAINTENANCE
Under normal use the amplifier should give years of trouble free service.
The only user maintenance required from the user is to vacuum the front
grille periodically.
In some extreme cases it may be necessary for your supplier to clean the
inside of the amplifier. These conditions usually occur after prolonged use
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.
Troubleshooting
These are typical things to check if you think your amplifier is faulty:
Fault: No output.
If the -40dB LED is functioning there is nothing wrong with the amplifier and
the likely cause is an unsecured Speakon.
Check 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 your loudspeaker has not got a short circuit in its windings,
(this can occur when the speaker coil gets warm).
Fault: The amplifier goes into protect with power indicators off.
Check that the AC line voltage is not outside the amplifier's operating range
(130-260 volts). Over/under-voltage protection may have occurred.
If the amplifier is connected by mistake to a 3-phase supply (415V), an
internal non-resetable fuse or resistor may have blown and the amplifier
must be returned to your supplier for service.
Fault: The amplifier does not respond even after checking above items.
In the unlikely event, that there is a non-user rectifiable fault, return the
amplifier to your supplier or an approved service centre.
Martin Audio Ltd cannot be held responsible for damage or injury, as
a result of the top cover being removed.
Martin Audio – MA4.2 Power Amplifier
E
NGLISH
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CONTENTS
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