Question about AudioBahn A2300HCT Car Audio Amplifier

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AudioBahn A2300HCT no sound

Hi all the blue lights show up on the amp, however i do not have any sound coming from the amplifier. I was running a orion hcca sub of the amp on a low voume when i heard a crack sound and could smell some smoke, However none of the fuses popped. Does anybody know where i can get a schematic diagram from?

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  • kabirparmar Sep 05, 2008

    Hi i am not an expert at electronics, however my dad does so i will ask him to have a look at it in more detail. I have taken the top casing of the amp off and i noticed some burn marks around the heat sink and on the little resistors on the board labled Q12p etc. Also i took of some of the clamps holding the components onto the heat sink and i noticed that 4/5 of them were heavily burnt. The components had the following writing on them: IRFZ48V and underneath that lable it said IDR432H, 10 C1.



    Thanks

  • kabirparmar Sep 09, 2008

    Hi



    I was looking at the supply FETs on various websites and i am unsure as to which one i will require as they are quite hard to find. There are so many different voltage rated fets with the same model number. I have found a website with them however im unsure as to which one it is. Can you please tell me



    http://uk.rs-online.com/web/search/searc...*IRFZ48*&Ntk=I18NBrandPartNumber&Nr=AND%28avl%3auk%2csearchDiscon_uk%3aN%29&Ntx=mode%2bmatchallpartial&N=4294955188&Nty=1&LanguageId=en

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Generally, if the amplifier smokes, the power supply FETs have failed.

Many times, the output transistors fail and that causes the power supply FETs to fail.

Audiobahn won't release schematics. The amplifiers are relatively simple and a schematic isn't generally required.

If you know how to check the transistors, check them to determine the severity of the damage. If you don't know how to check them, read through the following page following all links provided.

Basic Amplifier Repair

Let me know if you have any other questions.

Posted on Sep 05, 2008

  • Perry Babin Sep 05, 2008

    Those are the power supply FETs. IRFZ48V is the part number. The circuit board designation 'Q' prefix tells you it's a transistor. The 'P' suffix means it's a power supply component.

    At the very least, you'll have to replace ALL 8 on the side with the burned transistors. If there are burned transistors on both sides, you must replace all 16 of them.

    You need to check the TIP35Cs and 36Cs to see if any are shorted. If any shows a short between the 2nd and 3rd legs, it (or one in parallel with it) is shorted. All that appear to be shorted in the board must be replaced (even though only one of the parallel group may be shorted).

  • Perry Babin Sep 09, 2008

    Before replacing any parts, you MUST read and 'understand' the information in the yellow box on the basic repair site I posted. If you don't, you will almost certainly destroy the new components.

    The following is probably a better source.

    IRFZ48PBF - Farnell

    Did you check the output transistors yet?


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