Macro-Tech
®
602/1202/2402 Power Amplifiers
Page 24
Reference Manual
from the AC mains power receptacle.
2. Remove the PIP module (two screws).
3. Locate the sensitivity switch access hole inside the
chassis opening as shown in Figure 4.3. It is located
just above the phone jack inputs.
4. Set the switch to the desired position noted on the
label for the access hole. The position toward the
front panel sets the sensitivity to 1.4 volts for
standard 1-kHz power, the middle position provides
26 dB gain, and the back position sets the
sensitivity to 0.775 volts for standard 1-kHz power.
5. Replace the PIP module and reconnect the power to
the amplifier.
The Macro-Tech 2402 has back panel Reset switches
that are used to reset the breakers that protect the high-
voltage power supplies from overload. If a breaker trips,
the IOC indicator for the affected channel will turn on
(see Figure 4.2).
4.5 Filter Cleaning
Dust filters are provided on the air intakes to the cooling
system (see Figure 2.1). If these filters become clogged,
the unit will not cool as efficiently as it should and may
produce output levels that are lower than normal due to
high heat sink temperature.
To clean, remove each of the filter elements by gently
pulling them away from the front panel. Clean with mild
dishwashing detergent and warm water. Replacement
filters may be ordered from the factory.
Dust filters are not 100% efficient—depending on the
local environment, the internal heat sinks of the ampli-
fier will benefit from periodic cleaning by a qualified
technician. Internal cleaning information is available
from our Technical Support Group.
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