APart CHAMP-2 [7/16] Inputs and outputs

INFO@APART-AUDIO.COM

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

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 and remove the overload and then power on again ! More

details can be found in the table below.

3)APCactivityledleft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.

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 ! Don’t ignore this!

5)Templedleftchannel:thisledlightsupwhentheamplierisoverheated.Outputpower

willautomaticallybecutbytheAPCcircuitry.Thispartoftheprotectioncircuitresetsitself

automaticallywhentemperaturehasnormalized.Whenbothsignalled(2)andtempled(5)are

red,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 the

transformer has cooled down, the user MUST turn off the power, remove the cause of

the fault condition, wait for cooling down and then power on again!

6)Bridgeled:thisledlightsuptoindicatethattheamplierisinbridgemode.

7)Powerswitchandpowerled:iptheswitchtopowerontheamplier.Theblueledwilllightup

to indicate that mains power is present.

3. Inputs and outputs

Frontpanellayout:

1 2 3 4 75 6 8 9 10 11 12