user manual
TFS-780
TFS-780 user manual
Page 46
combination of RF pickup in unshielded cables acting as aerials, and multiple complex
reactances in the cable and loudspeakers.
High frequency instability can be avoided by adopting these common sense rules:
♦
Ensure the input wires are shielded and that the shield is connected to the amplifier's
input XLR pin 1.
♦
Do not run output cables next to input signal lines. Keep apart, and preferably cross at
right angles. If cables have to follow a similar route or path, keep them separated by at
least 2 feet (0.6m).
The Cooling System
The TMC amplifiers’ cooling system is designed to maximise efficient heat exchange at all
times. Operating temperatures are monitored close to the power device junctions. Audio
power drive is muted if the temperature rise exceeds 90
°
C. Reset is automatic. The incoming
air is drawn through the filter aperture visible on the front panel.
Filter Inspection & Maintenance
Caution: To avoid risk of shock when inspecting or changing the filter, switch the amplifier
off. If this can not be done, please remove jewellery, and never poke metal objects into the
air inlet aperture.
Keep the filter clean and do not operate the amplifier without the filter in place, except in an
emergency. Heat dissipation can be seriously impaired by a covering of dust or dirt. If the
dust build-up inside is substantial, it may prove impossible to remove except with specialist
cleaning equipment. Similarly, the residues present in the smoke from some types of cracked
oil smoke generators, as well as being hazardous to health, may cause severe contamination
of the heat exchangers after a long period of exposure.
Inspect the filter periodically, or whenever the amplifier's temperature metering indicates a
higher than normal operating temperature.
Temperature Metering & Protection
The 'real' temperature of the output devices is monitored close to their junctions. Each
channel's output is muted if the temperature exceeds 90°C. If this happens, the output of that
channel is reduced by 3dB and you will notice that the TEMP LED is illuminated. If no further
action is taken, the amplifier’s output will be muted, and the TEMP LED will remain lit.
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