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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

Posted by on

  • PioneerPards Aug 01, 2009

    I have noticed the clicks just before it cuts off or when it attempts to start.

    Would you please help me specify which relay board I should be looking at and the joints.

    Thank You.

  • PioneerPards Aug 01, 2009

    Aug 01, 2009 - Larsauskog,
    I have noticed the clicks just before it cuts off or when it attempts to start.

    Would you please help me specify which relay board I should be looking at and the joints.

    Thank You.



2 Answers

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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

  • Anonymous Aug 01, 2009

    It is normal to hear a click when it starts.

    But if you hear clicks when you have not asked it to start/stop, that could be the same problem I had.

    If so, and you feel confident you can partly disassemble your amp, handle circuit boards and solder, this is what I did:

    Disconnect from the mains power (duh).
    Unscrew the top chassis cover with the screws on the back. Keep track of where the screws went. Take off the cover.
    You may have to remove a black plate (possibly a dust blocker) from the top of the cooling rib to get access.

    You are now looking into the open amp with its front panel facing you. The relay board should be fastened with two screws to the near left side of the chassis, close to the front panel circuitry. The board is parallell with the ground, but not on the bottom. If you can see it, it has several black 'boxes' on one side. If you have not done anything else than removing the chassis, you can stand back, plug it in and turn it on to verify that this is the place the clicking sound comes from.

    When you have disconnected it again, you can unscrew that relay board, and wiggle the board out. The cables to other boards are not very long and are soldered instead of using connectors, so be careful not to rip them out.

    Inspect the solder side of board for cracked, dull or irregular solder joints (mine had little solder on them, and they were in a miscolored area (because of heat)). The high-wattage resistor I mentioned is mounted 'standing' a centimetre or two above the board. This is the suspected culprit in my case. Resolder where needed.

    Now put everything back and screw them into place.


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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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