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dead channel on CRO

Discussion in 'Electronic Repair' started by SkyDemon, Nov 3, 2003.

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  1. SkyDemon

    SkyDemon Guest

    Hi, i have a Kikusui COS5020 oscilloscope and channel 1 on it doesnt work
    (not getting any trace at all). Does anyone know where to get the
    schematic/service manual for it? (I have found a paid site but ill try and
    see if i can get it free first).

    Also can anyone point me in the right direction where to look for the fault?
    When no channel is selected there is a faint unfocused mark on the screen
    which stays there when ch 1 is selected so this leads me to believe that
    maybe there is something wrong with the input selection section.

    Hope that made sense :)

    Cheers
     
  2. Jerry G.

    Jerry G. Guest

    It is very common that in most scopes people blow the front end by injecting
    too high a voltage, as like in TV sets or power supplies. The MosFets are
    most likely blown.

    --

    Greetings,

    Jerry Greenberg GLG Technologies GLG
    =========================================
    WebPage http://www.zoom-one.com
    Electronics http://www.zoom-one.com/electron.htm
    =========================================


    Hi, i have a Kikusui COS5020 oscilloscope and channel 1 on it doesnt work
    (not getting any trace at all). Does anyone know where to get the
    schematic/service manual for it? (I have found a paid site but ill try and
    see if i can get it free first).

    Also can anyone point me in the right direction where to look for the fault?
    When no channel is selected there is a faint unfocused mark on the screen
    which stays there when ch 1 is selected so this leads me to believe that
    maybe there is something wrong with the input selection section.

    Hope that made sense :)

    Cheers
     
  3. Nigel Cook

    Nigel Cook Guest

    Generally speaking the diagnostic problem with
    scopes as far as X and Y amps is they have
    to be DC coupled throughout. So anywhere in
    the chain something failing and sending the
    signal high or low will shift the o/p well off beam.
    Other than i/p FET overdriven the other common
    problem is one of the pair of push-pull output
    drivers to the CRT plates having failed.

    e-mail (removing .....) .....k
    electronic hints and repair briefs , schematics/manuals list on
    http://homepages.tcp.co.uk/~diverse

    Nigel,Diverse Devices,Southampton,England
     
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