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SR-56 calculator

Discussion in 'General Electronics Discussion' started by Clark, Feb 2, 2010.

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  1. Clark


    Feb 2, 2010
    I have a TI SR-56 calculator bought in the 70`s. where might I get an estimate for repair? Thanks Clark
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    There are some calculator collector web sites that may be able to help.

    If your SR-56 has a nicad pack, chances are that the problem is that the nicads have died. They are normally pretty easy to replace yourself, although you may have to cut open and re-glue the battery pack.

    Some of the earlier TI calculators used a pack with a single AA NiCad and a boost regulator using a TL496 to get 9V to power the calculator. If you have one of these, it is possible that the inverter has died.
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