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4.3. Indicators
The APA amplifiers are equipped with a simple but efficient combined indicators system.
Indicator CLIP/PROT (2, 8) function as PROTECTION indicator.
They point to the lack of signal at the speaker outputs. These indicators may light up
due to following reasons:
1. From the moment the machine is switched on, until stand by period finalise that is
necessary for the stability of the internal tensions of the power amplifier.
2. Because the amplifier output has short circuited.
3. If the amplifier is giving a continuous voltage or is of very low frequency, this could
damage the loudspeakers.
In any case, should these indicators permanently light up, it is a sign of malfunctioning
and its cause should be investigated.
CLIP/PROT indicators functioning as CLIP indicator.
These illuminate when the signal given to the loudspeakers is 1.5dB before the real clip.
This CLIP system takes into account the possible variations in the mains voltage always giving a
real indication even if the electric mains varies. It is normal that working at high power levels, the
CLIP indicators illuminate at the rhythm of the low frequencies which are the ones that passes
major energetic contents. Make sure these indicators are not permanently illuminated.
THERMAL protection indicator (1, 5, 9)
Alerts of the tunnel cooling temperature when it has risen above 90 centigrade degrees.
The amplifier will then start up automatically when the temperature descends to 75 centigrade
degrees.
The APA600 amplifier features one TH indicator while the APA1000/1400/2000
models use one for each channel, denoting that both channels operate independently. The
protection on one channel could be active while the other channel keeps working correctly.
SP Signal Presence indicator (3, 7)
It points to the existence of signal at the amplifier input. These indicators light up
when the input signal surpasses -40dB.
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.
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