Master audio HD Serie Manual De Instrucciones página 15

¡ Make sure this LED is not alight permanently ! No extra power is obtained in
this way and dynamics are lost.
11 – PROTECTIONS
Temperature
An inadequate installation or any other anomaly related to cooling may cause that the
amplifier's temperature exceeds the security limits (>90ºC), exposing its internal
components to failure. If such a situation may arise, the corresponding protection
circuit will cause a stop during a certain time according to the seriousness of the
anomaly detected. The PROTECTION and LIMITER leds will light on at the same
time, and the output of the affected channel(s) will be disconnected.
In models HD2000 and HD3200, before the amplifier completely stops because of
temperature problems, it will reduce the output level by 6dB approximately. If the
temperature is reduced to normal parameters, the normal output level will be
reestablished.
Short circuit
In case of very low impedance or short circuit in any loudspeaker output, the
LIMITER led is activated and a significant descent of the output level of the affected
channel will be observed (loss of volume, but keeps working).
Direct Current
In the case that due to some malfunction the power module tries to deliver direct
current (DC) at the output, the protection circuit will immediately disconnect the
module to avoid damage to the loudspeakers. In that case, the PROTECTION and
LIMITER led's will light on at the same time and the output will be disconnected.
Other causes that could prevent the normal work of the amplifier can also activate
the PROTECTION. Under those circumstances, the installation has to be revised
according to the basic principles described below:
Disconnect all the connected peripheral equipments (sources, pre-amplifiers,
-
and loudspeakers). Leave the amplifier "alone" and verify if the anomaly
disappears or if it remains in only one channel or both.
- Temperature: Cooling (possible air obstruction. Check if the fans work and
make an internal cleaning).
- Short circuit: Check the state of the loudspeaker line (possible short circuit,
disconnect and check if the anomaly disappears).
- C.C. at the output (DC): Possible serious breakdown. Contact an authorized
technical service.
In all cases it is recommended to go through all previous checkpoints before
contacting the authorized technical service and reporting the observed problem.
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