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No audio - Pioneer Amplifier A-Z370

Hi there,

I have a Pioneer Hi-Fi system and now the audio works intermediately or not at all, I think I haveisolated it to the amplifier A-Z370(I think).

Things that I have tried:

  1. Cold restart (disconnecting all the decks and power and connecting them back again: this did work but only for a hour or so)
  2. Have individual decks working at any one time (trying to find a particular deck that causes the problem, but audio still not there, even tried just the amp, equalizer and the cd player)
  3. Check the speakers with another system (the speakers work fine and the wires have been re-cut)
  4. Using an external audio source (connected a laptop via phono, equaliser detected audio, but still no sound)

The system is on properly, speakers are in the correct portsand selected correctly on the system also.

There isn’t any haze/fuzz sound when I turn the volume up tomax.

Any Ideas?

Thank you

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Re: no audio - Pioneer Amplifier A-Z370

I experienced something similar.

Symptom: After use the sound cuts out together with a mechanical click (relay sound). Turning off and waiting a bit before powering on, tends to 'fix' it, but the sound cuts out in the same way after a while.

The click led me to the little relay board inside. Inspection of the solder joints showed that a few were 'broken' ("cold soldered"). This was right below a high-wattage resistor, possibly the cause of the stress causing these random disconnects.

Fix: Resolder the joints.

Posted on Jun 30, 2009

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Re: no audio - Pioneer Amplifier A-Z370

PioneerPards, You said it is working intermittently. You jumble up your system pretty good. You know what you are looking for. Try hooking up your speaker to the amplifier and put a signal directly into it...could be a CD player and run it till it stops. don't worry about the sound for now if it is dry without your spices. while at work, give it a tap ocassionally around your AMP. if it stop and go, then your problem is the amplifier. A dead AMP will not work at all whatsoever. Since it works sometimes, could be a dry joints (Cold solder...check pcb solder. If the amp is good for a couple of hours or so (Pumping hard occasionally), then the culprit maybe from one of your spices...EQ's and processor whatever in between from source to Amplifier. Hope this will help.
Good Luck.

Posted on Jan 03, 2008

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