HP 54502A Part 2

Рет қаралды 1,966

4 жыл бұрын

The part arrived that we suspected was the problem in Part 1. Was it able to be installed? Did it fix the problems? Watch the video and find out!

Пікірлер: 9

@jpaz3852 3 жыл бұрын

Thank you very much. Just got one from ebay with the same problem. I will order the part ASAP.

@SuperHaptics 3 жыл бұрын

If your scope is failing several test that you did not expect it to, do not give up!!! Clean your BNCs with some electronics cleaner and try to use good probes. Ideally use high frequency new cable bnc to bnc to connect the back to the front inputs. Before doing the calibration I have been working on the PSU unit. It was blowing the mains fuses. I traced the problem to the input side full bridge rectifier . One diode was shorted. I saw bad electrolytic corrosion on the input side aluminium stud (a metal stick close to the input common mode inductor. The rest looked ok apart from some capacitors (I think capacitors around L4 and L6) held together with the inductors that are leaking badly. I swapped the bridge for the KBL4010 and powered it up. It works, I wonder what caused the bridge to fail. But capacitors need to be changed anyway. To whoever needs to fix their PSU here are some very useful links... enjoy: @t And for those who cannot pay for the original schematics here is a reversed engineered schematic for a very similar PSU which however seems to have several component values that are different but is a good start:

@paul.alarner6410 2 жыл бұрын

naff comment,hows it going with teaching your granny on the egg sucking ??

@cdrsfrg 3 жыл бұрын

I am having trouble finding a DS1230Y-100+. While a DS1230Y-150 or -200 work as well?

@nse_labs 3 жыл бұрын

Hi Bob, the dash number at the end of the part number is the speed of the part. The original part was 120 nS (-120) so you'll want something that fast or faster. You'd be taking a chance with -150 or -200 part since those are slower. Here's a link where you can find the part, look for -120 or faster (lower numbers are faster). I don't have any affiliation with Newark, just a customer. www.newark.com/search?st=DS-1230Y

@cdrsfrg 3 жыл бұрын

@@nse_labs Thank you very much. I did find a -100 and I ordered a socket as well. Just in case my soldering technique is not up to speed. I will let you know how the scope tests out after I replace the memory chip. It should be here this week.

@yusdiy 4 жыл бұрын

Thank you for doing this video. I bought a Tek TDS340A. It has what might be a NVRAM too. Its working on borrowed time. I thought the NVRAM stores the scope program ware therefore requiring a programmer to transfer data into new NVRAM. I hope to replace mine as straight forward as was done by you here. If you have any tips or caution for me please tell. Thank you for this video.

@nse_labs 4 жыл бұрын

Thank you yustech. You'll have to make sure any new part you install is compatible with the old part you are replacing. The pinout and functionality must be the same. You'll notice that the part I replaced (DS1235Y) had a -120 after the part number. This indicates that it is a 120 ns part, in other words the response time of the part is 120 ns or faster. I replaced it with a -100 part which is faster than the original which is OK in this case. If it were a slower part, say -150, it might not work. Good luck!

@yusdiy 4 жыл бұрын

@@nse_labs thank you for more tips.looks like i have to do more inquiry in forums. Thank you again sir.