| Electronics > Repair |
| [solved] Agilent infiniium 54855A calibration problem |
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| Aiy:
Hi again, I have made an initial annotation on your photos, trying to illustrate the different areas of interest. I'm doing it from memory since I do not have my notes at home.. In my case, the delay lines were faulty close to the trigger ICs. Check them with continuity tester (look up datasheet for pinout, they do not match mine from what I can see). The ECL/LVDS circuits are also part of the trigger / calibration circuitry, as well as signal conditioning for AUX and LINE triggers. My suggestion for debugging is to take high-res photos of the ECL/LVDS stuff, create a list of all ICs (Uxxx silkscreen marks) and look up their datasheets (modern equivalents by ONSEMI should be possible to find). Then proceed with a continuity tester to find how they interconnect, unless the traces are visible on the top/bottom layers of course. If you do not find anything obviously wrong, like open connection on the delay lines you should proceed to power the board and probe around carefully with another oscilloscope to check the MC100 ICs. If any of those are broken, they can be ordered and replaced quite easily. NOTE: you have to create sufficient airflow over the heatsinks or the oscilloscope will shutdown from overheating! You did not post a description of how the oscilloscope trigger problem shows itself when you try to use it, the self-cal is only part of the troubleshooting. You should power it up and put a sine signal on one of the input and sweep it through the oscilloscope's frequency range and watch the screen. Post screenshots of the screen if you see symptoms of problems with the trigger. I see that you also have problems with your motherboard in another thread, but perhaps you have a way of powering and debugging the the acquisition board while you find a motherboard replacement. Best regards, AIY |
| Aiy:
Acquisition board backside annotated image. Best regards, AIY |
| super_electron:
Thanks for highlighting the critical areas in the picture. Here is the picture with part number of the delay line . The part number on the delay line is (MS160S). I believe it is a GL1L5MS160S. The ECL parts are fro ONSEMI with part numbers 10h131g an 10h116. |
| Minsoon:
Nice to meet you friend My equipment seems to have a similar problem. When I took a picture of the resistance value of my delay line, the resistance of one side of the line was very large. Can I request more details, photos, or drawings of the delay line repairs? thank you good luck! |
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