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Tek 475 trigger problem

Discussion in 'General Electronics Discussion' started by fwb232, Oct 26, 2008.

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  1. fwb232

    fwb232

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    Oct 26, 2008
    Initially there was no sweep on my recently acquired Tek 475. Then I replaced the trigger generator IC U600 p/n 155-0049-01 with a new 155-0049-02. Now I get sweep, but it is impossible to sync the trace. Sweep is free running in all modes (except single) and slope +/-, level controls have no effect, only the "A Trig Holdoff" has some effect on low frequency signals. The "triggered" light is always on.
    Any advice ? Is there a difference between the -01 and -02 IC's that can cause this ?
    Thanx for any hint. (I've another scope for troubleshooting)
     
    Last edited: Oct 26, 2008
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