| Electronics > Repair |
| HP54600B with spike problem with and without signal |
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| T3sl4co1l:
How are they "too heavy"? Scope screenshots should be a couple 10 kB each, easily attached to a post. Photos rather than screenshots, low 100s k maybe. Do you not have an image adjustment app? Tim |
| sacha:
Hi Tim, I made two videos where on the first you see from pins 1 to 14 and on the second you see from pins 15 to 28. I only have two hands but it's the fastest method I know. I created two files that I can send to your inbox or on a social network such as Telegram. I don't rescale or compress them so as not to lose video quality. sorry for the late reply but I was asleep :-) |
| iMo:
Without a schematics would be your effort pretty laborious.. Simpler way might be to focus yourself on the components in the area you have already identified. The temperature dependent problem could be caused by any part there, incl. ceramic and tantalum capacitors. Cool down the area and heat up locally the parts, one by one, or vice versa.. You should be able to identify the part. Some YT bloggers do repairs of everything equipped with infrared camera and cooling spray only, sometimes they use resistance meter :) |
| fmashockie:
--- Quote from: sacha on April 21, 2024, 04:20:46 am ---Hi Tim, I made two videos where on the first you see from pins 1 to 14 and on the second you see from pins 15 to 28. I only have two hands but it's the fastest method I know. I created two files that I can send to your inbox or on a social network such as Telegram. I don't rescale or compress them so as not to lose video quality. sorry for the late reply but I was asleep :-) --- End quote --- Why not just make a YouTube account? You can post your videos there and just add a link to it here. That way many EEV blog users can view them so you can get more feedback. Also, can you capture the waveforms on your scope, save them, and then take a photo with your phone? Unless of course they are hard to trigger on, then taking a video is a good way to go. |
| T3sl4co1l:
Anyway, main thing was to inspect the rising/falling edges, preferably those coming from or going to the RAM; so, a trigger on /OE, /WR would be relevant, also general signal quality, and timing if you can tell if there's anything funky going on over a longer time scale. This is more of an interactive process that isn't really something that's going to work well back-and-forth on the forum I'm afraid... I would encourage more learning about how these systems work generally, and how to test and debug them, or if that's too much bother, just replace the chip(s) and see if that improves it. Tim |
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