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HP 8640B option 01 modulator problems

Discussion in 'Electronic Repair' started by Robert Morein, Aug 21, 2003.

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  1. Posting for a buddy:

    The HP 8640B comes standard with a 400/1000 Hz AM modulator. The entire
    assembly, including front panel knob, is mounted on a plugin board.

    The Option 01 replaces the fixed frequency modulator with a variable
    frequency unit. It, too is mounted completely on one plugin board, including
    front panel control.

    When he attempts to swap the 01 variable frequency modulator into a unit
    which was equipped with the fixed frequency modulator, it doesn't work, and
    the FM modulation, which is located in another part of the instrument, fails
    as well.

    These results are constant over multiple units.

    Why?
     
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