Roland SRA-200E About the Protection Circuits, Thermal Protection Circuit-Protectsthe Amp

About the Protection Circuits

The SRA-200E features special circuitry to protect the amp and any connected devices. Whenever this is activated, the PROTECTION indicator lights, and sound is cut off from the speakers. Stop operation of the equipment, and immediately check to find the cause of the problem.

1. Thermal Protection Circuit—Protects the Amp

Speaker output is cut if the temperature of the amp's heat sink exceeds 100˚C. Stop operating the equipment for a short while to allow the heat to dissipate sufficiently. In addition, check the setup of the SRA-200E and rack, if rack- mounted, and take steps to allow enough circulation to carry away the heat generated by the amp.

(For more information on rack-mounting the SRA-200E, see "Notes on Heat Dissipation" → p. 13).

*The unit automatically restarts when the temperature of the heat sink falls. However, if the overheating protection circuit is activated again, check to make sure that the operating environment and the speakers connected to the amp output connectors conform to the SRA-200 specifications (4 ohms in stereo, 8 ohms with the BTL connection).

2. DC Detection Circuit—Protects the Speakers

Whenever DC (direct current) is generated in the output sent to the speakers, the output is cut off, protecting the speakers.

→The SRA-200E restarts a few seconds after generation of direct current in the output ceases.

3. Muting Circuit—Protects the Speakers

When the power is switched on, output to the speakers is cut for a few seconds, thereby protecting the speakers from the sudden noise that occurs when the power is switched on.

12