Re: HP AN/USM 281A Oscilliscope needs repair (San Antonio TX)
开云体育Hi there firstly welcome to the group but could you please include your name at the end of your posting Now to your problem? You are very lucky that the military service / operating information includes the CCT diagrams ?I trust you Have volumes 1 and 2 it appears that the AN/USM 281A is a ruggedized version of the HP 180? and this is a very good old oscilloscope and very reparable ? At this time I suggest you repeat your posting as HP 180 Oscilloscope needs help with repair this might receive more postings The horizontal board is next to the tube and has Very High voltage, The lack of horizontal deflection is normally due to component frailer the 2 drive transistors that provide the deflection to the tube and there drivers are the usual ones that fail ? regards Paul B???? south cost UK From:
hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...]
? ? Hello all, I am completely new to oscilliscopes, and I just acquired one of these for free, since it was not working. Cool thing is that the technical manual is downloadable and the user manual as well, since this is a military unit. Now the rub: I have never used an oscilliscope, and might not ever use one, however I'm learning electronics repair and my Dad is telling me that this could be an invaluable piece of troubleshooting equipment. Another problem is that you normally need a couple things to troubleshoot an oscilliscope, such as a frequency generator and - another oscilliscope. I've used the flow chart on the technical manual and it appears that the horizontal signal board needs to be repaired. The CRT projects a beam only when I press the TEST button and only vertical adjustments are possible. Horizontal adjustments while holding the test? button down do nothing. Anyone in the San Antonio TX area willing to help a newbie out? I work long hours (3am - 8pm mostly) so the time I get off is usually weekends. No virus found in this message. |
Paul Bicknell