General Protection Mode; Heat Protection Mode - TC Electronic Classic 450 User Manual

Introduction
The Classic450 is equipped with an intelligent protection system,
ensuring that the amp does not suffer or malfunction if operated
wrongly or in extreme environments.

General Protection Mode

The compression meter has five LEDs. If the two left LEDs and
the two right LEDs start blinking alternatingly, the amplifier is in
Protection mode.
Protection mode is invoked when, for some reason, a short-
circuit situation occurs. In Protection mode, the speaker outputs
are shut off so that the speakers cannot be damaged by a
shortcut. However, even in General Protection mode, the
balanced output and the effect loops out (SEND TUNER OUT)
are still passing audio.
To solve the problem, try turning off the Classic450 for a minute
and then turn it on again. If protection mode is still indicated, you
will have to send the Classic450 to a qualified service-center for
inspection.
APPENDIX – MISCELLANEOUS

Heat Protection Mode

If the Peak LED lights up while the amp is in General Protection
mode, the amp is too hot. This is rarely seen, but a few extreme
situations can invoke this mode:
a) If the amplifier is used in an environment that is too hot, or if
proper ventilation is not ensured.
b) Cabinets or combinations of cabinets must load the amplifier
with a minimum of 4 Ohm. You can use a maximum of three
RS cabinets or two 8 Ohm cabinets of any other brand.
If e.g. the speaker output is loaded with only 2 Ohm or less
and you drive the Classic450 at very high volumes over a
long period of time, the amplifier enters Heat Protection
mode.
In both situations, proceed as follows:
– Turn off the amplifier.
– Solve the issues.
– Allow the amplifier to cool off for a few minutes.
– Turn the amplifier on again.
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