Calrec PPM drivers

Discussion in 'Electronic Repair Modifications DIY' started by mberry593, Apr 13, 2012.

  1. mberry593

    mberry593 Active Member

    Joined:
    Apr 10, 2012
    Location:
    Silver Spring, Maryland
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    I bought 2 old Calrec PPM drivers on ebay some time ago. No documentation was included. I figured out the inputs/power/outputs & fired them up into a pair of Sifam PPMs.

    The good news: They came up exactly right with +4dBu = PPM 4 and the top end of the scale was right on.
    The bad news: The bottom half of the scale was far off with errors getting larger at the lower end. They both have identical errors.

    They have several adjustments & I guess I could hack around and figure out what they all do but it would be so much more civilized if I could locate an alignment procedure or at least a schematic.

    Can anyone here help?

    Thanks
     

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