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Q - P O W E R 14
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P O W E R A M P L I F I E R
10
T R O U B L E S H O O T I N G
10.6 Signal and Clip LED of one or more channels are red intermittently
This LED pattern indicates that the corresponding amplifier channel has gone to
short-term protect mode. This can have multiple reasons:
a) Short-circuit protection has been triggered (3 sec. protect duration).
>
Check the loudspeakers and cables for possible short-circuits.
b) Overtemperature protection has been triggered (undefined protect duration,
depending on temperature rise and fall).
>
Reduce output volume and/or loudspeaker load.
c) DC protection has been triggered (0,5 sec. protect duration).
>
Check the input signal quality and level.
>
Reduce the input signal’s very low frequency (subsonic) signal compo-
nents.
Very low frequency components with asymmetric shape (for example
when heavily distorted) might trigger the amplifiers DC detection. Be
aware that the amplifier is technically DC coupled (except for the DC
servo), so it will try to amplify anything which is fed to it’s inputs, even if it
is only a few Hz and regardless of it’s shape and distortion.
d) HF (High Frequency) protection has been triggered (2,5 sec. protect duration).
>
Check input signal for HF components.
10.7 Output power lower than usual
>
Check the selected/programmed MCB
The selected MCB can have noticeable influence on overall output
power of the amplifier. Especially smaller MCBs < 16 A usually will also
reduce the maximum output power of the amplifier.
>
Check the mains distribution
Very weak mains distributions or generators may cause the mains volt-
age to drop considerably when heavily loaded by the amplifier. Although
the amplifier continues to deliver music, the output power will be reduced
to compensate for the lack of mains input power.
10.8 The amplifier gets hot very quickly
>
Check the attached loudspeaker impedance and cabling.
Low loudspeaker impedances < 2 Ω will cause faster heating of the
amplifier stages.
>
Check if the selected/programmed MCB is larger than 20 A for the ROW
range.
If such a large breaker is selected for the ROW range, the amplifier will
be able to deliver more continuous long-term output power (not peak).
This in turn will also result in higher amplifier module temperature rise, as
now the long-term output power will not anymore be limited intrinsically
by the mains input current limitation. In this operation condition it is pos-
sible to drive the amplifier stages into thermal limitation or even thermal
shutdown. This behaviour is normal and must be taken into account when
operating the amplifier with such large MCBs in the ROW range.
10.9 The
CAMCO
USB MCB Updater application does not connect to
the amplifier
>
Check if the USB cable is properly connected and inserted.
>
Check if the amplifier is connected to mains.
>
Eventually try to reconnect in the “USB”
à
“Connect...” menu and chose
the USB device manually.
>
Unplug and replug the USB cable and wait a few seconds for your oper-
ating system to detect the hardware, if necessary also close and restart
the application.
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