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  • Help / Confirmation

    Looking at a un-readable part of a schematic (i will attach it )

    Can anyone confirm this ---- BR3 bridge rectifier on preamp page , should the + from the br3 go to the + of C8 , and the - from br3 should go to the - of C8 ......... correct ??

    If anyone can confirm that..im home free !

    Sorry...dealing with a old scem , a burnt part , and destroyed traces on a pcb....
    Attached Files

  • #2
    That schematic labeling is drawn odd.
    The definition is lost in that scan.

    Follow the diodes.

    + is +

    - is -

    marshall_jcm900_slx_100w_2100 BR 3.pdf

    EDIT: The + can be more clearly seen on BR 2 .
    The minus is drawn sideways.
    Last edited by Jazz P Bass; 09-08-2019, 05:16 PM.

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    • #3
      thanks---just making sure...see those odd markings at br3 ?

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      • #4
        BR3 markings are wrong, it doesn't help that drawing is sort of backwards (to convention) with AC coming in from the right hand side.
        + and - of the bridge go to + & - of the cap C8.

        Schem. from post #1 does not work, this one should:
        Attached Files
        Originally posted by Enzo
        I have a sign in my shop that says, "Never think up reasons not to check something."


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