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One channel does not power up

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?

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  • Contributor
  • 42 Answers

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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SOURCE: Sound through one channel only.....NAD 310 Amplifier

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.

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Grubhead
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SOURCE: Bryston 4b amp, left channel blows the back panel

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

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SOURCE: Marantz Pm-7200 left channel weak compared to the right

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.

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SOURCE: Hi, I have a second hand NAD 3240PE amplifier, the

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.

Dan

Posted on Dec 28, 2009

petraman7
  • 1175 Answers

SOURCE: Adcom GFA-7400 power amp; 1 dead channel (thermal protect LED on)

Hi...

I've contacted ADCOM before and they sent a pdf of the electricals

http://www.adcom.com/default.aspx

also try:

www.stereomanuals.com

Posted on Apr 17, 2010

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1 Answer

300W Pyramid PA305 protection light


What is the speaker load in Ohms that you are running? Or what exactly is hooked up to it? are you bridging it? The protection light will come on if the load is too much for the amp to handel. If the load (in Ohms) is less than the rated load that it can run, it will stop the output to keep the amp from self destructing. The amp will sense that the demand for power will be too high for the amps circuitry which will either make the amp get so hot that it will burn up the copper on the board or more likely burn up the power mosfetts that power the speakers. If the Ohms are within range then it will allow power to flow through the circuit until the rails that the mosfetts are bound to until they get so hot that it will go into thermal protection. So if your amp has both thermal and overload protection lights and the overload is light then the load is probably too much for the amp. if it's bridged in mono the you can only have 1 speaker setup hooked up it if it's a 2 channel amp. a 4 channel amp bridged in mono for both front and rear channels will be able to have 2 speakers rated a 4 ohms each hooked up to the amp 1 set per bridged output or channel.
Try it running in stereo with only 1 speaker per channel and see if it will produce sound. If not then you have an amp that has internal problems and will need to be serviced. Check your warranty to see if you are covered.

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1 Answer

One channel thermal overload stays lit and no output from that channel. even after unit sits overnight, thermal light on immediately,unit not hot. Looking for schematic?


Red light is on if:
- thermal protection, overheated amp, bad thermo sensor
- DC at speaker terminals
- high current at output transistors
Also could be a protection circuit malfunction.
In any case you need new channel module or send your module or whole amp for repair here.
Thanks,
Paul

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1 Answer

Adcom GFA-7400 power amp; 1 dead channel (thermal protect LED on)


Hi...

I've contacted ADCOM before and they sent a pdf of the electricals

http://www.adcom.com/default.aspx

also try:

www.stereomanuals.com

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Yes your solution is correct. Front wired in stereo, bridge rear.

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Units dc protect mode is probably activating due to Blown channel (shorted output transistors) I work for a Denon Authorized repair Center in Michigan If shipping to Michigan is economical let me know kstahl65@att.net

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