Question about Audio & Video Receivers

1 Answer

Hi. i have an Akai aa-8080 that powers up OK but starts switching on and off. there is a switch inside thats activating which is wired, connected to the fuse at back of receiver. this switch i think has something to do with 240VAC as if the electronics are being over loaded or something. this is pure speculation on my part as i knw nothing about electronics but as i have taken the lid off the aa-8080 i can hear and see this switch activating. any help would be greatly appreciated. thanks. peter.

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Novelist:

    An expert who has written 50 answers of more than 400 characters.

    Champion:

    An expert who has answered 200 questions.

  • Expert
  • 236 Answers

When you say it turn on-off you're not able to establish your audio out right? the possibility is that you have a bad speaker causing the system (aa8080) to trip. have you tried turning on without the speakers. can you try it first and then find out if it still does the same. because if there is something wrong in your output stage, you should not get that ticking/switching sound, it is not suppose to turn on (output stage) because that switching you can hear is actually your proitection circuit.

Posted on May 03, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

Our turntable is not producing any sound even though we have changed the speakers


Be sure the audio-out leads are connected properly to the receiver. They usually will work ok connected to the aux. plugs. Be sure the selector on the front of receiver is set to aux as well. Check the cartridge output wires to insure they are connected to the cartridge ok. If you have the receiver powered up and have the proper settings on the front of the receiver, you should get a little static sound when plugging the audio output leads into their respective input jacks on the receiver.

Feb 21, 2015 | Audio & Video Receivers

1 Answer

Sparks from Onkyo TXNR 609


Hi try turning the unit on without any speakers connected ,if it still want power up just take it to a servis . ;)

Feb 03, 2014 | Onkyo TX-NR609

1 Answer

I'm trying to connect a Bose 802-E active equalizer (and 802 speakers) to my Denon AVR-1404 hoe theater receiver. I have it connected via analogue RCA cables to the CDR/TAPE inputs and outputs. My problem...


Hi,
I'm not totally sure this will work but give it a shot.
Your remote has two slider switches on it and a "source" button. I would slide the Audio/Video Switch to Audio. And I would Slide the other switch to the "tape" positions. Then I would push the "Source" button. That may activate the traditional "tape monitor" switch functions used in traditional preamp designs. Give it a try.
If there is a jumper going from the pre-amp sections to the power amp sections, you could put the 802's EQ in that loop. I have the feeling that this feature is not part of Denon's designs.
I hope this helps,
Best Regards,
Mark

Jan 15, 2011 | Audio & Video Receivers

1 Answer

Wharfedale pro BX1360SD powered mixer intermittent fault - preamp section OK, no output from power amp (false overtemp detection? shutting down power amp??) please supply advice, circuit...


Wharfedale pro bx1360sd


I have had problems with this stereo mixer amplifier which had the symptoms of no sound output from either channel .

I opened up the unit and discovered that the amplifier was correctly amplifying my input signal up to a relay which switches the output through to the speakers .

This relay did not activate at all.

When the power switch is turned ON you should hear a click approximately 2 seconds later , if no click then there is a problem with the circuitry associated with this relay .

I traced out all the connections associated with this relay and made a circuit diagram .

The relay is a 24v relay and I will explain the way that I can see that this section of the amplifier works.

It has been designed to ;

  1. Create a slow start delay ( 2 seconds ) when the power is turned ON.

This it needed because otherwise there is a current surge and sparks from the relay turning on immediately.

  1. Thermal cutout mounted on heatsink . If the ventilation fan fails the heatsink and transistors may get too hot and the cutout will operate and cut power to the relay by going open circuit.
  2. Speaker protection from blown output transistors. There are 2 transistors q802 and q803 both 2sc1815. They are connected together emitter to emitter and collector to collector to form a differential Op amplifier I.C. If there is a blown output transistor then DC voltage will be detected by q802 and q803 and the relay will be switched OFF to protect the speakers .


Q804 turns On Q805 which turns On Q806 to activate the relay .

Voltages on transistors

Q802 and Q803 2sc1815

Base 0V Collector 12.9V Emitter 0V


Q804 2sa1015

Base 12.9V Collector 0V Emitter 15.1V


Q805 2sc1815 (driver for Q806)

Base 0V Collector 7.2V Emitter 0V


Q806 2sc1815

Base 0V at Turn ON then after 2 secs increases to 0.7V

Collector 2.8V ( transistor is activated as a switch Turned Fully ON ( saturated) to turn on the Load which is the relay .

Emitter 0V


I have replaced the following transistors to fix my amplifier q805 2sc1815 and q806 2sc1815 .If you are going to use a different type of transistor it may not work and also the lead connections of a 2sc1815 for the collector and emitter are different to those such as on a 2n2222( transposed).

Oct 15, 2010 | Audio & Video Receivers

1 Answer

Power button turns green, flashes and then turns red and flashes.


Hi,
While working it stops and flashes red approximately 2 seconds interval

Causes
Protection circuit is activated depending on the temperature of the surroundings

Remedy
Switch off the power supply and power on after the temperature have reduced.


While working it stops and flashes red approximately 0.5 seconds interval

Causes
1.Using speakers having less impedance than the specified.
2.If speaker core wire touch each other Protection circuit is activated


Even applying power red flashes 0.5 seconds interval

Cause
Amplifier circuit has failed

Remedy
Switch off the power and contact denon service centre


Thank You

Sep 07, 2010 | Denon AVR-789 Receiver

1 Answer

Cannot Power Up, Sometimes can


i had a real nice yamaha natural sound receiver and the relay that switched it on went bad a lot..... try the relay???

Apr 26, 2010 | Yamaha RX-V650 Receiver

1 Answer

I have an akai aa-a25 reciver and right side speakers only work


I had this problem when I first got this receiver back out of years in a box, but it was fixed by pressing the reset button on the back. Hope that works for you!

Jul 10, 2009 | Audio & Video Receivers

3 Answers

Akai s6000 sampler unused for most its life. Just when we need it it fails on the third full day. On power up the display is blank and all led buttong thats 8 under the screen stay fully lit. Power supply...


Same problem with an Akai S5000.
Display gets darker because power supply outputs for the mainboard starts falling after start up.
Don't know if its the mainboard is causing the problem or is a problem of the power supply itself.
A S5000 service manual will be helpful.
Best regards

Jun 10, 2008 | Audio & Video Receivers

1 Answer

Car audio


zeus_s007- This is a pretty technical,request so i hope you understand my instructions. I hope the harness plug is present,this makes it easier.First of all i'll give you the wire colors,there are a couple the same color and we will start there.
tan-left front speaker-positive
gray-left front speaker-negative
light green-right front speaker-pos.
dark green-right front sreaker-neg.
brown-left rear speaker-pos.
yellow-left rear speaker-neg.
dark blue-right rear speaker-pos.
light blue-right rear speaker-neg.
orange-12volt constant-memory
black-ground
yellow- 12volt key switched-may be bigger than yellow speaker wire-we can check the wires,will explain later.
gray - dash dimmer
brown-dash dimmer
You don't need the last 2 mentioned,any others left over not needed.
The safest way to check the 2 brown,grey,and yellow is to use a AA battery, as a speaker tester.You take the colored wires for the speakers and touch the AA battery to them. For example you know the 2blue ones are right rear wires-so take the AA battery and touch one blue to the one end of the AA battery and the other end to the other blue wire, you will hear static on that speaker.This will let you know the 2 proper wires for the speaker,no static -wrong wire.you only have to do this for the grey,brown,and yellow wires.Well I hope I don't confuse you,if your not sure,let me know.Good luck, happy wiring.
cooltek Mar,5/08

Mar 04, 2008 | Audio & Video Receivers

Not finding what you are looking for?
Audio & Video Receivers Logo

Related Topics:

484 people viewed this question

Ask a Question

Usually answered in minutes!

Top Audio & Video Receivers Experts

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

The Knight
The Knight

Level 3 Expert

68197 Answers

yadayada
yadayada

Level 3 Expert

60769 Answers

Are you an Audio and Video Receiver Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...