APART Champ - 4 - Input and Output Controls

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4
2. Inputs and outputs
1)Volumepotmeterchannel1:usethispotmetertopresetthevolume.Incasetheamplierhasbeenswitched
to bridge mode, this potmeter sets the level for bridge operation.
2)Signalledchannel1:thisledlightsupgreenwhenasufcientlystrongsignalispresentontherstchannel,
after passing the input level control. At startup, the led will light up red during a few seconds, this is perfectly
normal.Whenitlightsupredduringuse,thepowertransformerorpoweramplierisoverheatedorinprotect
modeandisshutdown.Turnoffthepower.The amplier will not turn on automatically after most error
conditions. In some cases, the user MUST turn off power, remove the overload or let it cool down and
then power on again !
3)APCactivityledchannel1: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,withoutallowingany
harsh distortion.
4)Clipledchannel1:thisledlightsupwhenevertheamplierclips.Thisisawarningsign:youarepushing
things a little too far or you are overloading the amp. Reduce the input level by a few dB so that this led never
lights up anymore !
5)Bridgeled:thisledlightsuptoindicatethattheamplierisinbridgemode.
6)Signalledchannel2:thisledlightsupgreenwhenasufcientlystrongsignalispresentontheleftchannel,
after passing the input level control. At startup, the led will light up red during a few seconds, this is perfectly
normal.Whenitlightsupredduringuse,thepowertransformerorpoweramplierisoverheatedorinprotect
modeandisshutdown.Turnoffthepower.The amplier will not turn on automatically after most error
conditions. In some cases, the user MUST turn off power, remove the overload or let it cool down and
then power on again!
7)APC
activityledchannel2: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channel2:thisledlightsupwhenevertheamplierclips.Thisisawarningsign:youarepushing
things a little too far or you are overloading the amp. Reduce the input level by a few dB so that this led never
lights up anymore ! Don’t ignore this !
9)Volumepotmeterchannel2:usethispotmetertopresetthevolume.Inbridgemode,thispotmeterhasno
function.
Frontpanellayout:
1 6 7 8 9 11 16 17 18 1910
2 3 4 5 12 13 14 15