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  • Re: Phonic SEM712A

    From Helmut@3:633/280.2 to All on Sunday, August 31, 2025 11:15:06
    Good day
    Could you please help me with the part identification of IC 1 (6pin) in power supply.
    It blew up therefore I am unable to identify it.

    Thank you
    Helmut Scharf

    --
    For full context, visit https://www.electrondepot.com/repair/phonic-sem712a-128887-.htm


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    * Origin: NewsgroupDirect (3:633/280.2@fidonet)
  • From legg@3:633/280.2 to All on Monday, September 01, 2025 00:00:12
    On Sun, 31 Aug 2025 01:15:06 +0000, Helmut <0c52c607b536b670d826203cf93fdc3e@example.com> wrote:

    Good day
    Could you please help me with the part identification of IC 1 (6pin) in power supply.
    It blew up therefore I am unable to identify it.

    Thank you
    Helmut Scharf

    Whoa! a 14yr old thread without photo/docs included.

    Given that there are two identical amp modules to
    handle mid-rang or bass, the usual method is to
    use the good module to identify values/types of
    damaged parts in the bad one.

    If you can't identify parts on the good module,
    pics or a description of markings might help.

    RL

    --- MBSE BBS v1.1.2 (Linux-x86_64)
    * Origin: A noiseless patient Spider (3:633/280.2@fidonet)
  • From legg@3:633/280.2 to All on Monday, September 01, 2025 00:30:16
    On Sun, 31 Aug 2025 01:15:06 +0000, Helmut <0c52c607b536b670d826203cf93fdc3e@example.com> wrote:

    Good day
    Could you please help me with the part identification of IC 1 (6pin) in power supply.
    It blew up therefore I am unable to identify it.

    Thank you
    Helmut Scharf

    I note that Phonic doesn't admit to having either made
    or discontinued an amplified version of the SEM712.

    This was a passive series.

    RL

    --- MBSE BBS v1.1.2 (Linux-x86_64)
    * Origin: A noiseless patient Spider (3:633/280.2@fidonet)
  • From legg@3:633/280.2 to All on Monday, September 01, 2025 00:55:08
    On Sun, 31 Aug 2025 01:15:06 +0000, Helmut <0c52c607b536b670d826203cf93fdc3e@example.com> wrote:

    Good day
    Could you please help me with the part identification of IC 1 (6pin) in power supply.
    It blew up therefore I am unable to identify it.

    Thank you
    Helmut Scharf

    Links to dropboxed schematics in EEVblog

    https://www.eevblog.com/forum/chat/anybody-got-schematic-for-phonic-sem712a-sem715a-powered-speakers/

    RL

    --- MBSE BBS v1.1.2 (Linux-x86_64)
    * Origin: A noiseless patient Spider (3:633/280.2@fidonet)