Question about Volfenhag ZX-8300 Car Audio Amplifier

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Protection light When I installed my Volfenhag zx8300 for the first time it worked great. The next day I tried to use and the protection light came on. So I unhooked it and did'nt reinstall it for a month. After reinstalling it the protection light came on again once I turned it back on. Could you please give some reasons why this is happening, and what I can do to fix this problem? Thank you very much for your help in this matter.

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  • dtang Jun 10, 2008

    How do I check the transistor? And thank you for your help.

  • dtang Jun 11, 2008

    thanks, but i cant find the link showing how to check the resistors for the for channel zx 8300.

  • dtang Jun 12, 2008

    you are being very helpful. but now i need to know once i removed the back of the zx8300 an after removing the screws on the board. what do i need to do to get the board out? it has eleven grey brackets holding the board down. thank you in advance for your help again.

  • dtang Jun 12, 2008

    did you recieve the pictures i sent?

  • sperrault123 Feb 19, 2009

    i have a volfenhag zx8300. i installed it and it worked overnight, the next day i turned on my truck and the protection light was on. it hasn't worked since


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It's likely that there are shorted output transistors in at least one channel. If you want to repair it yourself, you'd have to determine which transistors are defective and replace them. The following page will help guide you through the basic troubleshooting.

Basic Amplifier Repair Primer

Posted on Jun 10, 2008

  • 2 more comments 
  • Perry Babin Jun 11, 2008

    On the page (link) provided, read the section labeled:
    Transistor Failure/Checking Transistors

    There's a link to a page that shows you how to check the transistors. Let me know if you need more help.

  • Perry Babin Jun 11, 2008

    You need to check the transistors. Pull the clamps off of the transistors (after disconnecting the amp from the power source) and give me the numbers on the transistors. There will be multiple transistors with the same number. Give me the 5 or 6 numbers common to the groups of transistors. For example, you will likely have several with the number Z44. Others will likely begin with an A or a C.

  • Perry Babin Jun 12, 2008

    Can you send me a photo of the inside of the amp?

  • Perry Babin Jun 12, 2008

    I didn't receive them. If they were larger than 10 megs, they probably won't make it through.


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