7
4.3. Indicators
eGPA amplifiers include a simple yet effective indication system.
PROT/STBY indicators (7) show the absence of loudspeaker output signal. These indicators may
light up for following reasons:
1. During start-up, until the STANDBY time has passed. This time period is needed for the
internal operating voltages to settle.
2. A short circuit is detected at the loudspeaker terminals (PROTECT function).
3. When the module enters AUTO-STANDBY mode. In this case, the indicator will illuminate in
orange instead of red.
If these indicators remain lit in red, there's a malfunction that should be investigated to find the
cause of this lighting.
CLIP (2, 4) indicators light up when the signal level feeding the loudspeakers is just below the
actual clipping. This CLIP system takes into account possible variations in the supply voltage, always
giving a real indication. CLIP indicators light up to the beat of low frequencies when working at high power
levels ; it's normal as low frequencies are those with higher energy content. You must take care that these
indicators do not remain continuously lit.
SP Signal Presence indicators (1, 3) indicate the presence of a valid signal at the amplifier inputs.
The TH (THERMAL) (8) indicator lights when the unit has entered the protection mode due to
excessive temperature; normal operation is recovered when the amplifier internal temperature comes back
down to regular operating levels.
5. CLEANING
The front panel should not be cleaned with dissolvent or abrasive substances because silk-
printing could be damaged. To clean it, use a soft cloth slightly wet with water and neutral liquid soap;
dry it with a clean cloth. Be careful that water never gets into the amplifier through the holes of the front
panel.
