MA 2402 Power Amplifier
4 Operation
4.2Front Panel Controls and Indicators
The diagram below shows the controls and indicators on the front panel of the
A. Dust Filters
The dust filters remove large particles from the air drawn in by the cooling fan. Check the filters regularly to prevent clogging. The filter ele- ments can be easily removed for cleaning by gently pulling them away from the front panel.
B. Level Controls
The output level for each channel is set with these convenient Level controls mounted on the front panel. Each level control has 31 detents for precise adjustment. A security option is available to prevent tampering (see Section 5.3.3).
C. Signal/IOC® Indicators
These green multifunction indicators show sig- nal presence and distortion for each channel. As signal presence indicators, they flash syn- chronously with the output audio signals to show their presence. As IOC (Input/Output Comparator) indicators, they flash brightly with a 0.1 second hold delay if there is a difference of 0.05% or more between the input and output signal waveforms. This provides proof of dis-
D. ODEP Indicators
During normal operation of the ODEP (Output Device Emulation Protection) circuitry, these amber indicators glow brightly to show the presence of reserve
They dim proportionally as energy reserves decrease. In the rare event that energy reserves are depleted, the indicators turn off and ODEP proportionally limits output drive so the ampli- fier can safely continue operating even under severe conditions. These indicators can also help identify more unusual operating condi- tions (see Section 5.1.1).
E. Enable Indicator
This indicator lights when the amplifier has been "enabled" or turned on, and AC power is available.
F. Enable Switch
This push button is used to turn the amplifier on and off. When turned on, the output is muted for approximately four seconds to pro- tect your system from
Figure 4.1 Front Panel Controls & Indicators
Operation Manual | page 11 |