Indicators - New Stage Accompany ES 40 User Manual

ES 40 USER MANUAL
R
stage accompany
4.4

Indicators

Each channel of the amplifier is equipped with the following indicators:
•
Power: these LEDs will light when the amplifier is switched on.
•
Signal present: these LEDs will light when an input level of more than 40 dB under the
level that would cause maximum power (+6 dBu) is detected. The signal present LEDs
work independently of the input attenuators.
•
CLIP: this LED will light when the output level of the amplifier has reached its limit. The
indication is correct for every connected impedance. When the clip LEDs flash fre-
quently, action of the ACE system (Active Clip Eliminator) is to be expected.
•
ACE: this LED indicates action of the clip limiter. This limiter protects your high fre-
quency drivers against damage resulting from excessive clipping and it protects the
ES 40 against thermal overload. When the ACE LEDs turn on it is advisable to reduce
the input levels.
•
Protect: when these LEDs light, one of the following errors has occurred:
1: Thermal overload; the output devices of this channel have reached a temperature of
85 °C and the input of that channel is muted. Both channels work independently, so
thermal overload of one channel does not affect the other channel. In case of a contin-
ued overload, it is possible that the power supply runs hot. Also in that case, the ampli-
fier's input is muted. When internal temperatures have dropped 5 °C, the amplifier is
unmuted.
2: DC on output; this indicates that a sufficient amount of DC or subsonic energy is de-
tected at the output of the amplifier and that the amplifier is decoupled from the output
connectors. This also occurs when the amplifier is switched on and the electronic cir-
cuits need time to stabilise. Approximately three seconds after you turn on the ES 40
these LEDs should turn off.
3: HF on input; This indicates that high frequencies are detected on the inputs. In this
case check your input cables. It is also possible that the signal from any preceding ap-
paratus contains oscillations.
When the Protect LEDs light during normal use and the amplifier is not hot, check the
following things: Disconnect the input signal connectors. When the LED(s) switch(es)
off, high frequencies where probably present on the inputs. When this does not solve
the problem you may try disconnecting the speaker system. When the LED(s)
switch(es) off the DDC was probably not properly connected.
When neither of this solves the problem, the amplifier is probably damaged and should
be repaired by an authorised Stage Accompany service centre.
4-2