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Thread: L212 Subwoofer problem

  1. #1

    Thumbs down L212 Subwoofer problem

    I got a pair of JBL L212 in which the powercompany unfortunally have blown the amplifier in the subwoofer. Everything works, but the 50Hz tone (i am living in Sweden) from the main voltage is getting through to the woofer. I think the capacitors are blown and wonder if anyone has any ideas of where i can get new ones. I have searched the net but could'nt find anything. It would be nice to use the speakers with original amplifier for the subwoofer.

  2. #2
    Join Date
    Apr 2003
    Here's the Service Manual if you need it.

    L212 Service Manual

    Right-click, Save Target As...

  3. #3
    Senior Member Wayne's Avatar
    Join Date
    Jun 2006
    Perth, West Australia
    Quote Originally Posted by Giskard View Post
    Here's the Service Manual if you need it.

    L212 Service Manual

    Right-click, Save Target As...
    Hi Giskard

    The link comes up as page not found ?

    You wouldn't happen to have access to the service manual for the ESC200 surround processor/amplifier by any chance.
    I'am currently trying to repair one bought off e-bay, all 6 speakers arrived in great shape but the amp has a blown component in the output stage & there is unfortunately nothing more that i can do without a schematic, have put pictures in my last post which i cant seem to attach here ?
    Any information would be greatly appreciated.

    Cheers Wayne.

  4. #4
    RIP 2011 Zilch's Avatar
    Join Date
    Jun 2004
    Berkeley, CA
    The link works in CA.

    [Title page is kinda tilted, tho.... ]

  5. #5
    Senior Member duaneage's Avatar
    Join Date
    Jan 2005
    The First State
    YOu may have shorted a Diode as well, causing AC to get through. Don't turn it on until you get it fixed, there may be AC present on the parts that could be hazardous.

  6. #6


    Thanks for the service manual.
    I will check the diods too, it would be easyer if it 's a diod that is causing the problem.
    Thanks for the tips.

  7. #7
    Reinhard Schulz

    Bass Energizer Problem

    Quite some time has passed since the thread was opened. Nevertheless, if somebody else faces a similar problem with his L212 Ultrabass Energizer I thought that I post my experience here.

    I had by a sudden similar symptoms, strong 50 Hz hum and 1.2 V DC on the output.

    Turned out that the bridge rectifier was blown and AC passed into the amplifier. Fortunately I realized it immediately and shut the unit off. After replacing the rectifier with a new Si-Type (4A current capable) the unit worked fine again.

  8. #8
    Junior Member sweetliberty's Avatar
    Join Date
    Jan 2007
    I had a different problem with my 212's bass amp. About 2 watts output only. The repair was simple and cheap. 2 faulty capacitors about 3/4" long (C8 and 7) restored the amp to as good as new.

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