Question about Audio Players & Recorders

2 Answers

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

  • Level 1:

    An expert who has achieved level 1.


    An expert whose answer got voted for 2 times.

  • Contributor
  • 1 Answer

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

  • larsauskog 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.


  • Level 1:

    An expert who has achieved level 1.


    An expert that got 5 achievements.


    An expert whose answer got voted for 20 times.


    An expert who has answered 20 questions.

  • Contributor
  • 52 Answers

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


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer


@Michae Yokeum
"Rear Speakers on Pioneer VSX-401".

Hi Michae.
Wow, nice Hi-Fi!! :) :)

IF [manual_required] THEN

Check your SBch* setting which should be set to ON or AUTO.
*Speaker Back channels
More info on pg. 83 of manual.

PS - as this is a home hi-fi and not a car-radio, I've moved it from 'Cars & Trucks' to a new home 'Audio Players../Pioneer', where experts in that field can offer more help.

Oct 15, 2017 | Pioneer Audio Players & Recorders

2 Answers

Sony Mini Hi-Fi Systwm shuts down at high volumes

You need to have the fan in the check,possibly its not working anylonger

Jan 22, 2014 | Sony MHC-GX555 Mini Hi-Fi System Shelf...

1 Answer

How do I connect the Pioneer subwoofer s-dv55sw-k to a different receiver.

I'd take a clue from the highly-proprietary interconnection and this warning printed right on the back, "USE only with XV-DV55";

... and this warning from the seller in this example, "NOTE this is a specialized component unit, meaning it is only compatible with certain Hi-Fi's of the same brand, be sure to check compatibilty on the web BEFORE purchasing."
The little molex connector leading up to the subwoofer itself is probably one way to access it as a passive speaker without the lower section's amplifier. Measure its resistance. If it's about 8-ohms you may be able to drive it with an external amp.

Apr 23, 2011 | Pioneer IS-21MD CD Shelf System

1 Answer

Hi,I have an old stereo amplifier Model A-604R,and i want to make the most use i could from was my father's!! please help me connecting it,and can i connect it to a T.v?

Yes, if the TV has RCA-audio outputs, but TV audio electronics is hardly hi-fi; or get the TV-related audio from the cable/sat box. They always have RCA outputs. Jack them into the amp's input.

Jul 20, 2010 | Pioneer Audio Players & Recorders

1 Answer

Hi i have 760w pioneer that i am selling but i dont think it works because the red light does not come on when the wires are connected..are they're special wires that should be used for it to be connected?...


Oct 13, 2009 | Pioneer Car Amplifier GM-5100T - 2CH 760...

1 Answer

What amplifier should I use for 2 650W Subs?

HI DUDE .. I JUST GIVE suggestions Boss Car Audio D5504 "Diablo Series" 4-Channel Car Amplifier 2200 Watts ITS REALY GOOD FOR SOUND SYSTEM DUDEaaf1faf.jpg

Jun 10, 2009 | Pioneer GM-6300F Car Audio Amplifier

1 Answer

Technics hi fi

The audio amplifier IC damaged

May 09, 2009 | Technics SC-DV290 System

2 Answers

Pioneer PL-570 turntable (c.1973)

Yes first check is that the Gnd wire from your turntable is connected to the Gnd (ground) post at the back of your amplifier with a good clean tight connection.
If the problem persists, check ALL your hi-fi components mains plugs for earth connections including your turntable, then remove the earth connections on all but one component so that you are left with only item earthed.
What does sometimes cause problems is if 2 or more hi-fi separates are earthed and connected to each other the earth cables along with the hi-fi interconnects form an inductive loop that picks up interferance such as mains hum etc.
Regards John

Sep 16, 2008 | Pioneer PL-990 Turntable

1 Answer

Hooking uo a surround sound system

I have never used the "hi-fi" secion on the back of the TV. I have an HD DVR box and I run an optical cable from the box to my amp.

Jan 14, 2007 | Hitachi 43UWX10B 43" Rear Projection...

Not finding what you are looking for?
Audio Players & Recorders Logo

Related Topics:

2,145 people viewed this question

Ask a Question

Usually answered in minutes!

Top Audio Players & Recorders Experts


Level 3 Expert

102366 Answers


Level 3 Expert

5318 Answers

The Knight
The Knight

Level 3 Expert

75025 Answers

Are you an Audio Player and Recorder Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides