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HP 182T display/8559A SA - display only visible with beam find.

Tony All Messages By This Member #121642 Hi, I'm trying to troubleshoot an HP 182T display with an 8559A SA plugin that does not produce a normal display. When I put the plugin in for the first time it worked just fine. After about 15 mins the display slowly faded to blank and now the only way I can see the SA output is using the Beam Find button. I've attached a picture below of what I see. Is this is a vertical deflection problem? - the SA display looks complete - in the sense that it has both width and height in the Beam Find display (albeit shrunk by the beamfind)? - but it is not located on the screen under normal operation. Any pointers about where to look would be very welcome. thanks Tony 2022-01-11_14-54-35_670.jpeg
Francesco All Messages By This Member #122547 Hello Tony, I got the same problem when I switch on work for 30 minutes after starting fading, if I push the "find beam" display only visible with beam find. Do you find the fault? Best regards. Francesco.
Tony All Messages By This Member #122555 No - I have not been able to work out what is going on at all. I have two units affected in the?same way. Its pretty frustrating! Tony toggle quoted message Show quoted text On Wed, 16 Feb 2022 at 23:21, Francesco <realfran@...> wrote: Hello Tony, I got the same problem when I switch on work for 30 minutes after starting fading, if I push the "find beam" display only visible with beam find. Do you find the fault? Best regards. Francesco.
Francesco All Messages By This Member #122559 you hare locate on USA? ? ? Sent:?Thursday, February 17, 2022 at 7:54 AM From:?"Tony" <tonycox01@...> To:[email protected] Subject:?Re: [HP-Agilent-Keysight-equipment] HP 182T display/8559A SA - display only visible with beam find. No - I have not been able to work out what is going on at all. I have two units affected in the?same way. Its pretty frustrating! ? Tony ? ? On Wed, 16 Feb 2022 at 23:21, Francesco <realfran@...> wrote: toggle quoted message Show quoted text Hello Tony, I got the same problem when I switch on work for 30 minutes after starting fading, if I push the "find beam" display only visible with beam find. Do you find the fault? Best regards. Francesco. ? ?
Tony All Messages By This Member #122563 No, I'm in the UK toggle quoted message Show quoted text On Thu, 17 Feb 2022 at 10:32, Francesco <realfran@...> wrote: you hare locate on USA? ? ? Sent:?Thursday, February 17, 2022 at 7:54 AM From:?"Tony" <tonycox01@...> To:?[email protected] Subject:?Re: [HP-Agilent-Keysight-equipment] HP 182T display/8559A SA - display only visible with beam find. No - I have not been able to work out what is going on at all. I have two units affected in the?same way. Its pretty frustrating! ? Tony ? ? On Wed, 16 Feb 2022 at 23:21, Francesco <realfran@...> wrote: Hello Tony, I got the same problem when I switch on work for 30 minutes after starting fading, if I push the "find beam" display only visible with beam find. Do you find the fault? Best regards. Francesco. ? ?
paulswed All Messages By This Member #122564 Well at least the problem is big and bold. When just beam fid works it will be any of the following. Blanking Z is cutoff for some reason. X or Y or both are totally unbalanced. Typically some sort of supply failure if you find the delection all the way to one side. But if just x or y then most likely a transistor in that deflection circuit. Generally reasonable to find. Good luck Paul WB8TSL
Francesco Messineo All Messages By This Member #122565 FWIW, I've repaired a good number of 182C and 182T in a distant past and often there was a carbon composition resistor (100 ohms) going open in the cathode drive circuit. Frank toggle quoted message Show quoted text On Thu, Feb 17, 2022 at 3:07 PM paulswed <paulswedb@...> wrote: Well at least the problem is big and bold. When just beam fid works it will be any of the following. Blanking Z is cutoff for some reason. X or Y or both are totally unbalanced. Typically some sort of supply failure if you find the delection all the way to one side. But if just x or y then most likely a transistor in that deflection circuit. Generally reasonable to find. Good luck Paul WB8TSL
Francesco All Messages By This Member #122566 Hello Tony, when pushing the button "DISPLAY" get a vertical beam?
Tony All Messages By This Member #122571 yes toggle quoted message Show quoted text On Thu, 17 Feb 2022 at 14:55, Francesco <realfran@...> wrote: Hello Tony, when pushing the button "DISPLAY" get a vertical beam?
Francesco All Messages By This Member #122574 with one BNC cable connect the out D BNC on the back to the ext imput BNC on the front (push on EXT) then cek if retrace toggle quoted message Show quoted text ? ? Sent:?Thursday, February 17, 2022 at 3:40 PM From:?"Tony" <tonycox01@...> To:[email protected] Subject:?Re: [HP-Agilent-Keysight-equipment] HP 182T display/8559A SA - display only visible with beam find. yes ? On Thu, 17 Feb 2022 at 14:55, Francesco <realfran@...> wrote: Hello Tony, when pushing the button "DISPLAY" get a vertical beam? ? ?

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