Fluke 87 III burned processor - Page 1
Forum section: electronics / repair

author: wguibas
author_rank: Unknown
timestamp: January 20, 2016, 02:07:34 am
content: Fluke 87 III, wonder why bob's not my uncle

author: SL4P
author_rank: Super Contributor
timestamp: January 20, 2016, 02:17:30 am
content: So sad... it looks virtually brand new!What happened?

author: SL4P
author_rank: Super Contributor
timestamp: January 20, 2016, 02:23:33 am
content: Quote from: xrunner on January 20, 2016, 02:21:59 amAhh - oh, I see...

author: wguibas
author_rank: Unknown
timestamp: January 20, 2016, 02:33:10 am
content: Don't know how it happened , picked it up off ebay thinking it might be fun to fix it.

author: alsetalokin4017
author_rank: Super Contributor
timestamp: January 20, 2016, 06:20:27 am
content: Sure.... just find another 87-III you can pull the processor off of.At least we know now where Fluke keeps the magic smoke!(They do seem to be available from Fluke but they aren't exactly cheap. And of course there may be other problems in the circuitry that will simply release the magic smoke from the new one when you've put it in....)

author: SL4P
author_rank: Super Contributor
timestamp: January 20, 2016, 06:59:23 am
content: Quote from: alsetalokin4017 on January 20, 2016, 06:20:27 amJust to be safe - wet all the pins and solder them together - to increase the current carrying capacity!

author: Muttley Snickers
author_rank: Unknown
timestamp: January 20, 2016, 08:24:31 am
content: It's a nice picture but a sad bloody sight, see if it was listed as not working then I would have asked the seller before bidding what happened or what were they testing prior to the meters failure, this can sometimes give you a better indication as to whether you have any chance of getting it going again or not, luck of the draw really.Anyway hopefully you ended up with some fuses, leads or something to minimise the pain, damn shame.

author: krivx
author_rank: Frequent Contributor
timestamp: January 20, 2016, 08:31:49 am
content: I have a Fluke 87 spare PCB and I've just noticed that the part number is 851311, not 871311. I wonder if it's actually a Fluke 85 board or if the RMS functions were done externally on some models.

author: MrSlack
author_rank: Frequent Contributor
timestamp: January 20, 2016, 09:12:43 am
content: I can't think of any test gear I've bought off ebay that wasn't broken in some horrible and expensive way. This does not surprise me at all.

author: krivx
author_rank: Frequent Contributor
timestamp: January 20, 2016, 09:24:56 am
content: Quote from: MrSlack on January 20, 2016, 09:12:43 amAre you buying "used" or "for parts"? I have had pretty good experiences, often fully working but if not then usually mechanical or physical problems (cracked cases etc). I've only had to track down rare electronic assemblies once or twice.

author: MrSlack
author_rank: Frequent Contributor
timestamp: January 20, 2016, 09:31:23 am
content: Quote from: krivx on January 20, 2016, 09:24:56 amI buy both. I prefer completely dead stuff that is collection only. I don't tend to buy for parts if I'm honest; it's cheaper to buy new bits. If it works or is an easy repair then I'm happy. If it doesn't then meh. I tend to stick with entirely analogue/discrete stuff where possible any avoid anything with ASICs in, as much as I'd like a Tek 2465

author: Robomeds
author_rank: Frequent Contributor
timestamp: January 21, 2016, 03:18:37 pm
content: You might try searching to see if some place will sell a replacement chip. Certainly it's going to be gray market but if it fixes the thing who cares.Do keep in mind that Fluke does updates on models. I was trying to fix a 177 recently and noted that my 177 had a different PCB vs the ones shown in a recent thread. That PCB looks different than the one in my 87-3 (based on my recall).