Question about Audio & Video Receivers

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First I would like to thank you guys for your help, I have not electronics for quite some time until my daughters LCD TV went out and I found this sight and was able to fix it with no problems, so thank you!! I have an Elan 12 channel 100 watt per channel amplifier of which 10 channels are not working. I have the amp opened up but cannot visably see any burnt componets or any "popped Caps". Please help, Thank you.

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  • jchprime Oct 02, 2008

    There are no model #'s on the amp itself, I'll see if I can locate the owners manual.It started with one channel going out then my nephew played some very bassy music and nine addition went out

  • jchprime Oct 02, 2008

    Found the model, it is the Elan D series, D1200 12 Channel Digital Power Amplifier. thank you for you help.

  • jchprime Oct 06, 2008

    Elan D1200 with 10 channels out. i have the referenced amplifier, one channel went out at first, then my nephew played some very bassy music and 9 more channels went out at once. There are ten channels out currently, not muted. What are some probable fixes? Thanks,

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I suspect that each of the failed channels operation is limited by either a DC condition to the supply voltages for that channel(may be blown fusibles) a visual check of any fuses is the very first step. If you have a multi meter, this is the first place to start you tests. Checking voltages about the output stages, comparing the two channels that work, to the ones that don't. This may not be easily apparent as there are many channels down. Trace back the speaker output connections for the working chanels to determine where you have good voltages present. There will be much symmetry in the components for the other channels, with a bit of careful measuring, you should be able to locate if missing DC voltages to those stages are causing the problems.
If the DC conditions to each channel look ok, then the next step involves a good working knowledge of power amp stages and speaker protection circuitry. There may be a power output stage failure to each of the missing channels(likely if the amp has had teenager abuse), or the input sourcing/switxching/preamp stages may have failed(not so closely related to the abuse) Purchasing the service manual may be a good option if you are able to follow a schematic diagram, if you are not confident here, then taking the unit to an audio repair man will become your best option. I am happy to answer questions about it for you and render advice if there is something that we can put a point on in the diagnosis. Cheers.

regards
robotek

Posted on Oct 08, 2008

  • Graeme Ross
    Graeme Ross Oct 08, 2008

    It is also posible that the unit has an electronic audio switching IC in the input signal sourcing/matrix circuit of the amp. If there has been excessive audio levels feed into the input stages of the amp,this device may have failed, would explain the problem with the channels random failure as it is one device and could effect all channels.



    It wasnt a bass guitar he hooked up to it was it? :) That could fry it

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Hi,

With the indulgence of the others and if I may add...

To my knowledge, it would be improbable that a number of op-amps being low current, would blow simultaneously. In most designs, the op-amps would be 2 or 4 in 1 package and therefore a single failure is multiplied a number of times. It would be more to my thinking that the issue is brought about by:

  • B+ supply to the pre-amp circuitry (likely). Probably a dropping resistor or even a zener diode;
  • logic controller (most likely). Trigger in/out, digital gain control ; and of course
  • the op-amps themselves could be faulty as Abrsvcs has pointed out.
Incidentally, in the absence of a schematic diagram, you could try checking out the spec sheets of the component ICs (op-amps) to give you at least the recommended working voltages.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Posted on Oct 08, 2008

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Try cold soldering on the board of electronics components located in the internal area of the amplifier as you stated that you cannot see any burned components in the device.so cold soldering is the best solution for this type of problem as some of the components gets loosed in the board as the glue gets old in the board.

Posted on Oct 06, 2008

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The typical failure here is with an opamp chip that is common in many designs. I don't know your specific model, but if you open it up you will most likely see a series of 8 pins ICs that will be either 4558, 4565 or 4570 (as indicated by the markings on the ICs). These are likely blown. Finding which one(s) will be a bit tricky from a remote location, but we can try. Is there any way to post a picture of the boards inside the unit?

Thanks,
Dan

Posted on Oct 06, 2008

  • ABRsvcs Oct 06, 2008

    I forgot to add:



    In all likellyhood, the first channel smoked the opamp chip for that channel. In the second case, the opamp that buffers the main bus was weakened by the first failure and finally gave up which you saw as channels 2-10 going out. You most likely only have a couple of ICs defective.

    Dan

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  • Audio & Vide... Master
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Check first that you are operating the Amp properly, and that the channels are not muted.

Then you will need to test components on board following the diagrams on repair manual.

I will see if I can find any diagram for your model.

Posted on Oct 02, 2008

  • 1 more comment 
  • Ginko
    Ginko Oct 02, 2008

    I forgot to mention, I need the details on your model to find the service manual.

    Without a service manual, I can give you only generic hints.


  • Ginko
    Ginko Oct 02, 2008

    If this happened after playing loud music , then probably you have blown the final amp circuit. On transistor or valve amps you blew the valve or the power transistors.
    Your unit has probably an IC as power amplifier for each channel , one or more of this had blown. You test the pico fuse, or the resistor at the base of the amp IC for continuity to find out if the IC is gone.
    Procedure to troubleshoot the problem depend on the specific model.
    If you want to fix it you will probably need the service manual, so that you know what values you must get in return from component, and what diagrams to follow to test an area of the circuit.
    Try to find the model.


  • Ginko
    Ginko Oct 03, 2008

    Hi , unfortunately the schematichs for the D1200 are not available for free download. You can get the D 1200 service manual for $7.50 here

    Do not buy the schematics, buy the complete service manual, it will guide step by sted throught testing the Amp final and replace the defective component.


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