Hi all.
Just arrived here and it's my first post, hope somebody can help me. Please sorry for my bad english, be sure I will do the best of me to you understand what I mean. Thank you.
I bought today an 2465B, european versiĆ³n with serial number H705186. As service manual states, this one was made in The Netherlands, or at least assembled there. I don't think Tektronix was building this scopes in Europe, but maybe assembled, what do you think? The case is that this unit now resides in Spain, and will be here for long time.
If this scope supports one summer here in the south of Spain then be sure that this is like a rock
I bought this unit in EBay, and arrived at my home today. The scope was showing in the picture on EBay an error, "Test 02 Fail 53". Looking at the SM I found that the problem was the Delta T key, and then I told myself "go for it". Received it today and after a fast looking I saw that this key was stucked pressed, so pull out the key with small pliers and "Bingo" now the key Works and feel correct.
Power on the scope again and the key error was dissapeared, but another error comes, Test 04 Error 11. The SM shows calibration problem. After Reading a lot in this forum I've downloaded the NVRAM file, and I will try to burn a new DS1225 that I will buy in Mouser, don't know if that will work, but I will try... Don't know what will happens because this unit comes with Option 05 (TV), and maybe I will get some errors coming from that option..?
Another issue with this scope is that after about 20 seconds working (when cold) the trace starts to dissapear together with readout and in less tan 5 seconds there is no image on the screen, and did not come again when power off/on several times. If wait some hours then I see the trace/readout again for some seconds and dissapears again, slowly (5 seconds...).
The rest of the scope seems to work fine, if I press A/B Trigger key to sort the Cal error, pressing the keys it changes the parameters, channels, trigger, coupling, Autoset can hear the noise of the relays working, etc, all keys are working but no image on the screen. For this reason I think I can discard any issue with logic boards, but concentrate my attention to HV supply to CRT.
I know that is a good idea to change all Electrolytic capacitors, and I will do it soon, when I see that the scope is working. For Now I want to see the trace and do some tests.
I will open the scope this week and I will take pictures that I will post here. Maybe someone find this unit interesting by the fact that is rare to find (at least in this blog I think). I want to open it not only to repair it, but to see if there are big differences between the US Spec and this one, will see soon.
Can you please point me in the right direction on what to look first to solve the screen problem? I'm not an expert in electronic things, but very basic knowledgment.
Thank you all in advance.