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OPERATION/PROTECTION
THERMAL CUT-OUT
If the amplifier reaches a temperature liable to cause internal electronic damage, a thermal protection sensor will shut the unit off or disable
speaker output. The unit should be turned off for at least 10 minutes to allow for cooling. After this period, the amplifier should automatically
reset and continue to work normally. If it does not, turn the unit off for a longer period, allowing complete cooling of the amplifier before
trying again.
OPERATING TEMPERATURE
Allow adequate air circulation around the left and right-hand sides of the product, as these are the heat sinks for the power amplifier and
will run hot with high listening levels. This unit is intended for use in moderate climates. Recommended ambient operating temperature 5 to
35°C.
The thermal cut-out should only occur with continuous over-driving of a difficult load. If it occurs under normal conditions, there could be
a problem with insufficient airflow around the heat sinks or a fault with the loudspeakers. In this case it is advisable to contact your Rega
dealer.
DC PROTECTION
One of the design requirements of the Elex MK4 was to keep the capacitors in the signal path to a minimum to prevent unnecessary sound
degradation at this crucial line level stage. To achieve this requirement, the output of the power amplifier is DC coupled. In the unlikely
event of a circuit failure causing any one of the above outputs to produce an excessive DC voltage, the DC protection will activate within
milliseconds, protecting any connected device.
SHORT CIRCUIT PROTECTION
If the speaker leads are shorted, the fold back short circuit protection will protect the output stage from excessive currents. This protection
circuit is not placed in the audio signal path and therefore does not affect sound quality.
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