Help identifying unknown cap on Fluke OneTouch Series II PRO - Page 1
Forum section: electronics / testgear

author: asp
author_rank: Regular Contributor
timestamp: June 19, 2014, 01:14:33 pm
content: HiI got a fluke OneTouch Series II 10/100 PRO network tester that was broken when I got and I found out that one cap was short-circuited. It's C417 on the board.After removing it the OneTouch booted, but I would like to replace it with another cap and since I have no clue regarding what value it has I kindly ask here if someone has a repair manual / schematic of the board ( or even if somebody that owns a OneTouch Series II and is willing to measure that cap ) to kindly reply with it's value.Below you can see the board with the missing cap ( right ), and the blown cap itself

author: xygor
author_rank: Regular Contributor
timestamp: June 19, 2014, 01:37:01 pm
content: I don't have any knowledge of the tester, so some generic advice: If you can, measure the ones around it that look the same. It's probably the same value. It looks like a "bulk" capacitor in a power regulator circuit. Also, to get an idea of what the voltage rating might be, measure the voltage on them. You might even get a correct reading across the missing C417.

author: asp
author_rank: Regular Contributor
timestamp: June 19, 2014, 01:46:42 pm
content: Thanks xygor for the hint but it's the only cap that looks like that. the others are significantly smaller ( this one is 30% bigger than the rest ). The unit powers at 7.2V and I think that is the voltage of the cap as well. I did think it's a filtering cap on some power regulator as well since when powered on the screen flickers. The device works for now but I would want it fixed "properly".As it can be seen from the photos the faulty cap is much wider than the ones on the board ( can also be seen by the widths of the pads ).

author: xygor
author_rank: Regular Contributor
timestamp: June 19, 2014, 01:54:37 pm
content: It looks like a tantalum. Measure the body size and get whatever value fits given the voltage rating. The value is probably not critical. Be sure to get the polarity right when installing it.Here, for example, is data for AVX:http://www.avx.com/docs/Catalogs/f95.pdf

author: lazyace
author_rank: Newbie
timestamp: November 19, 2017, 08:21:50 pm
content: Just in case anyone comes across with the same question, the capacitor is 33uF.

author: kdl1950
author_rank: Contributor
timestamp: February 05, 2022, 08:47:02 am
content: Hi guys,I also have problems with a Fluke Onetouch Pro.First question:What type of replacement capacitor do you recommend for the C417?It's broken for me too.Is a certain manufacturer and series of devices recommended?The value should be 33uF. Also the voltage range. The battery supplies 7.2V and the power supply 12V.Second question:On the back is a resistor. It has also been thermally overloaded. Unfortunately, the code R075 doesn't make any sense to me. Can anyone tell me what the value of the resistor should be?

author: tunk
author_rank: Super Contributor
timestamp: February 05, 2022, 11:35:19 am
content: R075 could be 0.075 ohm.

author: kdl1950
author_rank: Contributor
timestamp: February 05, 2022, 03:04:58 pm
content: Ok thanks for your help I found what I was looking for.Think it is a kind of "safety resistor".What do you think about the capacitor?