APART Champ-One - Page 8

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6)Signalledrightchannel,thisledlightsupgreenwhenasufcientlystrongsignalispresenton
the right channel, after passing the input level control. When it lights up red, the power amp is
overheatedorinprotectmodeandisshutdown.Turnoffthepower.Theamplierwillnotturn
onautomaticallyafteranerrorcondition,theuserMUSTturnoffpower,waitforcoolingdownin
case of overtemperature, or remove the overload and then power on again !
7)APCactivityledrightchannel:thisledlightsupwhentheAPCcircuitryisactive.TheAPC
circuitry reduces the gain at the inputs to guarantee the full dynamic range of the power
ampliercircuits.
8)Clipledrightchannel:thisledlightsupwhenevertheultrafastcliplimiterbecomesactive.This
isawarningsign:youarepushingthingsalittletoofar:reducetheinputlevelbyafewdBso
that this led never lights up anymore ! Don’t ignore this !
9)Templedrightchannel:thisledlightsupwhentheamplierisabouttooverheat.Inputgain
willautomaticallybereducedbytheAPCcircuitrytoavoidfurtheroverheating.Thispartof
the protection circuit resets itself automatically when temperature has normalized. Caution:
turning off the APC circuit (rear switch ‘11’) will also turn off this protection feature and
will void warranty.
Whenbothsignalled(6)andtempled(9)arered,itispossiblethatthepowertransformer’s
thermalprotectionisactiveandtheamplierisshutdown.Turnoffthepowerandletitcool
down. The amplier will not turn on automatically after it has cooled down, the user
MUST turn off power, wait for cooling down and then power on again!