Question about Audio Players & Recorders
Hi. This amp has two discrete channels. Channel one is fine, on second the protect light stays on and the SMPS for the rail voltages does not start. The so called "housekeeping supplies" on amplifier PCB are fine (measured and compared with schematics). Anyone here who ever had this issue that one channel doesn't start?
Protect light will only come on for "Short" or "overload" Reffer to "Authorized" repair shop for diagnostics.
Protect light will only come on for "Short" or "overload"
Reffer to "Authorized" repair shop for diagnostics.
Posted on Jun 14, 2014
Testimonial: "Thanks, I was that far as well. Unfortunately this is not correct for this kind of amplifier. The QSC PL9.0 (did I mention which it was?) has more complex protection circuit."
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Posted on Jan 02, 2017
If swapping of left and right input sources and left and right speakers does not help...you might have a bad channel in your amp.
Posted on Sep 25, 2008
I would check out whatever drives the left channel first. If it is a transistor, you can put a ohm meter on the terminals and see if it shows a short (amp turned off). If there are two transistors for the left channel, and you find a short on one only, replace the other to be on the safe side.
Posted on Mar 25, 2009
hmmm. Let's start by swapping the wires you are using for your speakers. Double check the wire connections first, then take the left and place iton the right and vice versa.
Posted on May 05, 2009
Crackling is usually a dirty control. Try using an electronics cleaner (with lubricant) and spray out all of the controls and switches. With the unit off, work the controls and switches back and forth to "spread" the lubricant. I would spray, work and spray again.
Update this with the results and also see if the crackling is related to the overall volume level. If tied to the volume level, there could be a transistor inside that is breaking down and causing distortion.
Posted on Dec 28, 2009
I've contacted ADCOM before and they sent a pdf of the electricals
Posted on Apr 17, 2010
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