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Audiolab 8000mx power amplifier faults - Audio & Video Receivers

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575 ds will not power up even though standby power is present


It is possible that the amplifier had encountered a fault with a higher current drain which had triggered it to a protection fault condition. The fault can be with your output drivers. Please check for short on the outputs fitted for both the channels. Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise which can be a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board. Maybe the protect circuit by itself is shutting off due to a faulty bias or there is a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the amplifier comes out of the protect mode then check for short on the speakers.If the set does not power from the standby the processor IC and allied circuit must be checked. Check the +5 rail to the processor to confirm.

Oct 30, 2011 | Onkyo TX-DS575 Receiver

1 Answer

When i turn on my kenwood kr-v990d it powers up for about 2min then shuts down


It is possible that the amplifier had encountered a fault with a higher current drain which had triggered it to a protection fault condition. The fault can be with your output drivers. Please check for short on the outputs fitted for both the channels. Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise which can be a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board. Maybe the protect circuit by itself is shutting off due to a faulty bias or there is a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the amplifier comes out of the protect mode then check for short on the speakers.

Oct 23, 2011 | Kenwood KR-V990D Receiver

1 Answer

I have h/k avr 85. Power makes a clicking sound when trying to turn on. It's a Orange light around the power button. When I push power it turns red. Please help me.


It is possible that the amplifier had encountered a fault with a higher current drain which had triggered it to a protection fault condition. The fault can be your output drivers- the MOSFETS/IC's fitted for both the channels, Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise like a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.
You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board, maybe the protect circuit by itself is shutting off due to a faulty bias , maybe a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the protect is off then check for short on the speakers.

Thank you for using Fixya

Sep 09, 2011 | Harman Kardon AVR 85

1 Answer

Rx-v390 when i trun on power after few second auto shut off.. what could be the problem I changed all Fuse (4A 125V) still have same problem.


The problem is with either the Amplifier or the Speakers.

If you disconnect the Speakers and then turn back on and get the same fault then it is the Amplifier.

If it stays on OK then you need to turn off again and connect one Speaker at a time (turning off again between each one) until you find the fault Speaker.

If it is the Amplifier thats faulty then it could be a simple repair that would involve replacing some Capacitors but you would need a Soldering Iron and the knowledge how to de-solder and re-solder components to a PCB.

If you need any further assistance then just ask.

Jul 04, 2011 | Yamaha RX-V390 Receiver

1 Answer

I have a fisher ca-9145 stuck in standby and have no remote. I used it for years without one but am stuck with standby now... Any help would be awesome


Try disconnecting the speakers and powering up the unit. If it powers up normally there may be an issue with your speakers. When most amplifiers first power up they perform a check on the speakers making sure there isn't a short or a blown driver. If a fault is detected the system will stay in standby or not power up at all. Some more sophisticated amplifiers will display what the problem is.
I suspect in your case however there may be an internal fault needing the service of a skilled technician. The cost of repair of such a fault may be more then the price of a new unit.
-Good luck.

Apr 19, 2011 | Audio & Video Receivers

2 Answers

I have a Hi-Fi stereo with with turntable, two cassettes, three cd's two jacks for audio, one for MP3, and one for earphone the brand is memorex the audio has quit the hi-fi was built sept 2006 how do...


Ok, well whenever any Amplifiers Output suddenly quits, it is usually only one of two things, or possibly both, and they are The main Power Supply Unit, has faulted. The Main Audio Amplifier has failed, or as said, both.
Replacement, of the faulty component is the only real alternative.
If you wish to DIY, then you will need a service manual, for your exact make and model. Tools, Soldering Iron, Multi-meter, De-soldering Pump.
If it turns out to be the PSU, then this is a pretty simple drop in replacement, however IF it is the Audio Output Module, then this must be De-soldered from the PCB, and the new one re-soldered back in.pretty simple if done slowly and carefully.
If you do not wish to DIY, then i recommend that you obtain a "Quote" for any repairs from an authorised service center for Memorex. http://www.memorex.com/en-us/ Contact them and ask for a referral to a service center that they recommend clos by where you live. it may even be best if they accept, to return it to them for repair?

Dec 15, 2010 | Audio & Video Receivers

1 Answer

"protect" error


You more than likely have a problem with your power supply. Home theater receivers have many different watchdog or protection circuits. If the power supply is not output the correct voltage or is shorted that will trigger a fault. You could also have an overload condition on the output stage. Too much current drawn by the amplifier will trigger a fault.

Feb 06, 2010 | Sony Audio & Video Receivers

1 Answer

AVR 684 was working normally then shut off with rapidly flashing red led. Have allowed to cool overnight, tried different power sources, disconnected speakers etc, etc. Any ideas?


The unit more than likely has a fault in the power supply or the output stage. Common switching power supply problems are the FETs used for switching fail or the PWM generator fails. Output circuits can be configured many different ways. The trend these days is to use integrated high power amplifiers for each channel instead of discrete push pull amplifier stages.

Feb 06, 2010 | Denon AVR-684 6.1 Channels Receiver

2 Answers

Audiolab 8000CD Player Problem


This may be a problem with the sled motor. This is the motor that moves the optical assembly in and out along a rail. Try openint up the unit and cleaning off the rail with a dry cotton swab. Be careful not the leave any fibers on the rails. Also, while you are in there, clean the lens using another cotton swab and alcohol. Report back with your results.
Dan

Mar 28, 2008 | Audio & Video Receivers

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