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Wiltron 560A input module 560A-B-11351

Discussion in 'Electronic Equipment' started by Max65, Sep 22, 2007.

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  1. Max65

    Max65 Guest

    Hi there,
    I've got a a trouble repairing an input module 560A-B-11351 owned by a
    friend of mine.
    He gave me it with the Network Analyzer service manual, so I have the
    inner block diagram of the input module, but not the electrical
    diagram of it.
    Since one of the two 8 pins open frame input chips is faulty (and I
    don't know what it could be), does anybody know what are those chips?
    My friend said me he knows that the older model 560 used 2 thermal
    coupled j-fets instead of those chips, but I don't imagine how it
    could be, since the chips have 8 pins and two j-fets just 6!
    Any suggestions will be appreciated.
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