Question about Crown MA-5002VZ 2-Channel Amplifier

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My amp doesn't turn on

The trouble of my amp it doesn't turn on the power cord it's seems ok, it work at first but then nothing

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Take off all your speakers cables from amp and test if it is fixed you will have a problem in your cables or speakers itself-if not you have a problem in amp itself and needs to repair in service center.

Posted on Jul 17, 2008

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1 Answer

How do I eliminate buzz?


Things to check:
1. With your multi meter, measure from left ground to right ground. What do you get? Measure from each input ground to chassis. What do you get there.

2. Get or make a pair of shorting plugs. Plug those into the inputs. Power on. Hum there or gone?

3. Turn the pre-amp on. Connect. Level of hum change with preamp on?

4 additional information. How efficient are your speakers? This is a big amp, high-efficiency speakers may show some noise, while low-efficiency speakers won't.

A trip back to the shop may be indicated, too.

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Nad c355bee


Check to see if it works with headphones. If it doesn't then you might have a main power amp failure.

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Yamaha DSP-A2070 not working, and not power up in standby mode. All the fuses is OK. Please help ?


start reading on page 14 of your service manual.

let me know if you need further assistance!

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Internal power transformer or rectifiers. Could also be main power transistors.

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NAD M3 power light turns red immediately and PROTECT message displays. Amp keeps functioning but volume control doesn't work up or down.


Hello
Check the connection to speaker with this amp, for any short or any other fault. disconnect the outputs, ie, speakers from the amp, and switch it On, and see the protect display comes or not. If it comes, the fault is internal and the set need service.
Your M3 dual Mono integrated amp, is of high output power and its outputs are protected against any overload or short circuit. If the system detect any among this condition specified above, it will show protect mode display.
Never load this amp, as protection display is there, as it may damage the speaker or its internal power amplifier section circuits, may cause more money to get it repaired. OK.

Jan 23, 2012 | NAD M3 Master Series Integrated...

1 Answer

Before I ask, I know the risks involved in opening a high power amplifier. I know sending it to an authorized repair shop is the best (and most expensive, possibly more so than buying a new amp) option....


Hi,
When you heared or noticed any burnout components,most probably from the regulators/rectifiers/IC's/ voltage limiting dides/ etc,it means you're having a problem on your driver up main outputsection in your circuits ,you have to check steps by step,n most cases,like this HIGH POWER AMPLIFEIRs,its using a high wattage transistor/Mosfet particularly,
After replacing some faulty components,,Please,.kindly .do not connect immediately your expenssive speaker's,if you've 8ohms /50-100W dummyload parallel with your( ohmmeter on AC set), to monitor the ac abrupt dumping factor on the main output,
CAUTION;
When you noticed your amplifier is having a problem like poping sound/motorboating sounds/burned components and smell/trembling with low freq sound and etc,
Do not connect your speaker,specially HIGH POWERED OUTDOOR AMPLIFIERS just to avoid any damage or create fire, and extend some components damage on the circuits,
OPTIONS:
In deep repairing and troubleshooting in any electronic equipments, it needs complete diagnostic tools/schematics/techniques,...experience and observation sometimes is required,
IF YOU DONT HAVE IT,ITS BETTER TO BRING YOUR AMPLIFIER IN A SERVICE SHOP,
My friend,thanks and good luck,.

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I have a Denon PMA 500V amplifier. all of the output fuses were blown so I replaced them but the unit still doesn't work. Any suggestions?


hi.
Did you checked balanced impedance?load speaker impedance vs PA output?or PA might over driven,causing a trouble on the pre-amp to power amp circuits and components damage,
need to recheck related components on the pre-driver up to main output section,

Note: That,blowing of fuses with the same rating is an indication of trouble/shorted in a circuits that driven on it,

Thanks and good luck

microhit

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1 Answer

Nad c350 no power at all


check your output stage for bad speakers cable or bare wire of cable touch the body of amp----short circuit speaker cable----bad speaker it self------ bad input cable or defective input device .
disconnect all and check if it is ok---start to connect one by one from input to outputs------if all above failed you must contact service center for help.

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Try using a short patch cord from the effects send jack to the effects return jack. There are contacts in the effects return jack that interrupt the signal to the power amp. When that connection corrodes it can cause all kinds of strange troubles.

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Yamaha dsp-/e300 wont switch on


check your speaker wire and speaker for short circuit.

Jan 17, 2008 | Yamaha DSPE390 Amplifier

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