Australian Monitor KA1500 - Manual (Page 17)

7. Maintenance
Your KA1500 KA1500 KA1500 KA1500 KA1500 amplifier will need minimal maintenance.
No internal adjustments need to be made to the unit
to maintain optimum performance.
To provide years of unhindered operation we suggest
a maintenance inspection be carried out on a regular
basis, say every 12 months or so.
Fans
Due to the openness of the air path through your
KA1500 KA1500 KA1500 KA1500 KA1500 amplifier, very little dust should settle within
the amplifier. The unit has been designed so that any
dust and/or foreign particles that do settle within the
amplifier will not unduly hinder the cooling of the unit.
The mesh grille in front of the fans will act to limit the
amount of dust and lint entering the unit. You will find
in time that there will be a build up of dust and lint on
the grille which may start to hinder the airflow through
the unit. You should periodically remove the dust and
keep the grille clean.
Over time, dust may build up on the leading edge of
the fan blades and reduce their cooling efficiency.
The time taken for this to happen will depend on the
environment and the amount of use.
The fan blades are accessible once the lids are
removed and can be easily cleaned. You need only
hold the fan rotor still and wipe the dust off the blades.
Maintenance 17
Many users stall the fan and use compressed air to
blow the dust off the fan blades. It is important to note
that the fan blades must be held still whilst blowing air
over the blades otherwise you may burn out the
bearings in the fan.
Fuses
Along with rear panel mains breaker, there is four (4)
rail fuses provided internally in the unit. These rail
fuses are in series with the positive and negative
output supply to each amplifier channel and provide
overall protection for the output stage. If the amplifier
is subjected to heavy use such as short circuits, 2
ohm or bridged 4 ohm loads, these fuses will eventually
fatigue and may require replacing to ensure they do
not fail at an inconvenient time.
NOTE
Make sure the unit is off and is unplugged from the
mains. Give the main filter capacitors time to
discharge before removing lids and inspecting the
fuses.
You should replace the fuse if the element is sagging
or discoloured. Only ever replace with the same
type fuse and current rating.
When checking for a failed fuse, do not rely on visual
inspection alone. You should use an ohmmeter to
check continuity.
Only competent or qualified persons should attempt
any service or maintenance of your amplifier.