Marsh Sound Design HT 750,3 Channel Power Amplifier - Manual (Page 10)

10
Marsh Sound Design
INTERNAL
PROTECTIONS
Internal protections
1. Over-current protection
2. DC-fault protection
3. Over heat protection
The MSD-HT750 will go into protect mode
and cut off the main power supply to protect
the amplifier and
speakers. This usually
happens when the speaker terminals or wires
are accidentally shorted together.
The MSD-HT750 will go into protect mode
when it detects DC voltage at the speaker
output. This is caused by a DC voltage leak
from the pre-amplifier outputs or by an
internal fault that gives a DC voltage leak at
the speaker output.
When in the above mentioned protect mode,
the unit will shut down to prevent damage to
itself or the speakers.
If this occurs, wait
about 3 seconds for the unit to reset and turn
itself on again. This process will be repeated
for three times before the unit is shut down.
If protect mode continues, turn the unit off
and contact our service department.
If the temperature of the heat sink exceed
76 degrees C, the MSD-HT750 will shut itself
down. It will not restart automatically. Wait 5
to 10 minutes to let the unit cool down, and
then press the POWER button to turn it back
on.