| Electronics > Repair |
| Pb with hp 16500b logic analyzer expansion card. |
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| willycat:
Hi, Yesterday, while using my logic analyser, a component suddenly burned on my hp16535 multi probes expansion card. The PCB is a little damage, but this is fixable. This component is a polarized tantalum capacitor. I think it is used for decoupling, but i am not sure. He is completely burned, so i can't see his reference or value. If someone has this board, can he give my his value ? He is referenced C66 on the board and near the flat ribbon connector. Thanks for your help. |
| philpem:
The 16500B can take a lot of different types of analyser card. You need to post the model number of the card so it can be identified - it should be on the metal backplate. Some 16500 series cards also work in the 16700 series analysers. If you can't identify it, then the value may be similar to other parts on the board. It obviously had a lot of current going through it, so it was probably on a power rail. |
| coromonadalix:
if it by miracle still works measure the voltage on both traces / pads or what is left it will at least give you a voltage value and you could guess between 10 and 47 uf sure an picture of it will help good luck |
| MarkL:
The card type was in the post: HP 16535A multi-probe control module. It's a N-to-2 analog MUX for oscilloscope probing. It's a rare card, but hopefully someone has one and can look at the part value for you. I couldn't find any on-line photos with sufficient detail. The value of C66 is probably not too critical, and you could try to match it up by measuring the pad size or what's left of the body, and compare with the nearby C58 and C59 as philpem has suggested. Another approach would be to draw out the circuit around it to see if that presents any clues. It also looks like there might some additional damage in an inner layer near U24, but it's hard to tell from the photo if that's a burn or a copper void. You could also try posting to HP-Agilent-Keysight-Equipment on groups.io. |
| willycat:
Thank you for yours suggestions. I tested the board and good news, it is always completely functional. Damages are only in the top layer. I will post to the group you mentioned which appears to be dedicated to this material. Thanks for your help. |
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