AUSTRALIAN MONITOR IS1200, Installation And Operation Manual

Page: 15 / 17

15
Maintenance
Only competent qualified persons should attempt any service or
maintenance of your amplifier. Your IS Series 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.
NOTE;
The following instructions are intended for action by qualified personnel only .
Fans
Due to the openness of the air path through your IS Series 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 amplifier. The grille in front of the fans will act to limit
the amount of dust and lint entering the amplifier. You will find that in time
there will be a build up of dust and lint on the grille which may hinder the
airflow through the amplifier. You should periodically remove the dust and
keep the grille clean. Removal of dust from the rear grille will also aid cooling.
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. 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 a rear panel mains fuse, there are four (4) internal rail fuses 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, 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 ohm meter to check continuity.