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Cisco 1802 Router Damaged by Lightning

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    #1

    Cisco 1802 Router Damaged by Lightning

    Hi All

    I need some help.

    I had one unit of Cisco 1802 which was damaged by lightning.
    As attached you can see that the capacitor has been charred / burnt out.





    The Fuse has been tested with a DMM and it was found to be open.

    I know that getting cisco schematics are difficult.

    Looking for values for C260 and C261

    and curious on what is CR20 and CR22, which I believe is a protection diode.
    Just wanna check how it is tested, made by ST ML16 C723

    Thanks in advance.
    Attached Files
    Tags: None
    #2
    Re: Cisco 1802 Router Damaged by Lightning

    Originally posted by ant3202 View Post
    Hi All

    I need some help.

    I had one unit of Cisco 1802 which was damaged by lightning.
    As attached you can see that the capacitor has been charred / burnt out.





    The Fuse has been tested with a DMM and it was found to be open.

    I know that getting cisco schematics are difficult.

    Looking for values for C260 and C261

    and curious on what is CR20 and CR22, which I believe is a protection diode.
    Just wanna check how it is tested, made by ST ML16 C723

    Thanks in advance.
    I noticed that cr usually do not refer to a diode . You can affirm that if there isn't an anode bar on it .. I think they are some capacitance resistance like their abbreviation say .

    Comment

      #3
      Re: Cisco 1802 Router Damaged by Lightning

      cr look like some type of diode - maybe a zener surge protector.

      i would meter them, and the windings on that coil

      Comment

        #4
        Re: Cisco 1802 Router Damaged by Lightning

        Originally posted by stj View Post
        cr look like some type of diode - maybe a zener surge protector.

        i would meter them, and the windings on that coil
        Somehow yes .. Looking at older routers reveal that this piece is a surge protector , but it's not a diode , or at least in testing purposes .

        Comment

          #5
          Re: Cisco 1802 Router Damaged by Lightning

          no, but it shouldnt look shorted

          Comment

            #6
            Re: Cisco 1802 Router Damaged by Lightning

            found it.
            smp100mc-160 Trisil
            Attached Files

            Comment

              #7
              Re: Cisco 1802 Router Damaged by Lightning

              Originally posted by stj View Post
              found it.
              smp100mc-160 Trisil
              this is good info...... appreciate it.

              Comment

                #8
                Re: Cisco 1802 Router Damaged by Lightning

                update....

                the bad smd had been removed...
                does anyone has a clue on those two values?



                many thanks
                Attached Files

                Comment

                  #9
                  Re: Cisco 1802 Router Damaged by Lightning

                  connected to ground from a data line - very low - probably in the pF's but high voltage to survive spikes.

                  you find stuff like that in modems and old set-top boxes with a fone connection.

                  Comment

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