MC2 Audio E Series Instruction Manual page 14

Maintenance
CAUTION: These servicing instructions are for use by qualified personnel only. Ensure that
Electrical power to the unit is disconnected before carrying out any maintenance.
GAIN/SENSITIVITY SETTINGS
Gain settings are changed internally by simple jumper links. Four rows of pins marked - GAIN A and
GAIN B - are situated on the input PCB (PCB741). A jumper link sets the gain and the settings are as
follows:
Link 1 & 2
Link 2 & 3
Link 3 & 4
NOTE: Factory setting is normally link 2 & 3 = 32dB gain.
Setting higher gain does not change the maximum available power but changes the level of signal input
to achieve maximum power. In any case, provided that the input signal is less than 20dBu/7.7V, the
built in limiter circuit will prevent distortion within the amplifier.
The gain should be set to match the signal from the source, e.g. mixer, controller, equaliser etc.
AIR FILTER
The filter behind the air intake apertures on the front of E SERIES amplifiers should be cleaned or
replaced periodically, e.g. 3-6 months. (Filters in amplifiers located in more 'dirty' atmospheres may
require more frequent maintenance). Access is via the blue front panel retained by 2.5mm Hex screws.
The filter should be 'dry' cleaned, using a vacuum cleaner preferably. Running the unit without a filter is
not recommended unless it is within a 'clean room'. Replacement filter material is available.
No other regular maintenance is required.
If you have any doubt about carrying out this procedure, refer to a service engineer or
contact your dealer.
IF YOUR AMPLIFIER DEVELOPS A FAULT, PLEASE REFER TO YOUR SUPPLIER FOR SERVICE
AND TECHNICAL SUPPORT. DO NOT ATTEMPT TO REPAIR THE FAULT YOURSELF AS THIS
WILL INVALIDATE THE WARRANTY.
gives 26dB gain
gives 32dB gain
gives 36dB gain
= +16dBu/4.9V sensitivity
= +10dBu/2.5V sensitivity
= +6dBu/1.5V sensitivity
14