I was using my Fluke 75 yesterday and it gave a low batt sign. I bought it around 1986 at Fry's in San Jose. I opened it up to throw a new 9-volt batt in it and noticed two yellow capacitors which looked like they had a black stripe running top to bottom on both sides. They looked like large tantalums from the shape. I put my finger on them and found the coating was rubbery and the stripe was a crack. Any ideas what they are and are they going to be a Problem? Meter seems to work fine especially with a new battery. I should send it to fluke for a new display the LCD is looking very washed out but still readable.
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sigpicThe Sky Is Falling
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Re: Fluke rubber capacitors.
i dont know about the caps, but the display is probably fine - it's the zebrastrip that usually fails. -
Re: Fluke rubber capacitors.
series 1,2 or 3?Comment
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Re: Fluke rubber capacitors.
These?Attached FilesThings I've fixed: anything from semis to crappy Chinese $2 radios, and now an IoT Dildo....
"Dude, this is Wyoming, i hopped on and sent 'er. No fucking around." -- Me
Excuse me while i do something dangerous
You must have a sad, sad boring life if you hate on people harmlessly enjoying life with an animal costume.
Sometimes you need to break shit to fix it.... Thats why my lawnmower doesn't have a deadman switch or engine brake anymore
Follow the white rabbit.Comment
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Re: Fluke rubber capacitors.
I'm not sure about the series. I looked it up online and found what you meant by zebrastrips. Mine has light colored ones so maybe series 2? I'll give it a clean and see what happens. Hope the display doesn't completely die, that's my usual luck. Thanks.sigpicThe Sky Is FallingComment
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Re: Fluke rubber capacitors.
Yeah, that's what they look like goon. Not exact but real close. Are they supposed to be split?Last edited by rhomanski; 03-01-2016, 10:07 PM.sigpicThe Sky Is FallingComment
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Things I've fixed: anything from semis to crappy Chinese $2 radios, and now an IoT Dildo....
"Dude, this is Wyoming, i hopped on and sent 'er. No fucking around." -- Me
Excuse me while i do something dangerous
You must have a sad, sad boring life if you hate on people harmlessly enjoying life with an animal costume.
Sometimes you need to break shit to fix it.... Thats why my lawnmower doesn't have a deadman switch or engine brake anymore
Follow the white rabbit.Comment
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Re: Fluke rubber capacitors.
Roger that. Not a problem then. I was thinking I might have to replace them. Thanks.sigpicThe Sky Is FallingComment
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Things I've fixed: anything from semis to crappy Chinese $2 radios, and now an IoT Dildo....
"Dude, this is Wyoming, i hopped on and sent 'er. No fucking around." -- Me
Excuse me while i do something dangerous
You must have a sad, sad boring life if you hate on people harmlessly enjoying life with an animal costume.
Sometimes you need to break shit to fix it.... Thats why my lawnmower doesn't have a deadman switch or engine brake anymore
Follow the white rabbit.Comment
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Re: Fluke rubber capacitors.
The Fluke 70 series I, II and III have an outstanding 2,000 (two thousand) hour battery life. Once the low battery comes on, replace it immediately otherwise you can get funny and incorrect readings.
As goontron noted, they are spark gaps. See this recent and relevant discussion over at eevblog where I just finished posting some comments.I opened it up to throw a new 9-volt batt in it and noticed two yellow capacitors which looked like they had a black stripe running top to bottom on both sides.
http://www.eevblog.com/forum/repair/...pair-teardown/
Faded digits on early Fluke series are a known problem. SeeI should send it to fluke for a new display the LCD is looking very washed out but still readable.
http://mrmodemhead.com/blog/fluke-8x-faded-lcd/--- begin sig file ---
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Re: Fluke rubber capacitors.
That's also using it for years taking voltage and watching all sorts of signals at work.
I was working an autopilot once. I tapped in to an lvdt and watched it as the stabilizer was trimmed up, looked good, trim down, good, except the voltage never went away after it stopped moving. It would do it everytime. No wonder the autopilot would kick off. That lvdt is internal, had to replace the whole actuator.
I Dropped it many.many times. Can't say enough how good that 75 has been. I also have a simpson 360 from the same period. I've never dropped it, doubt it would have survived as well if I had.sigpicThe Sky Is FallingComment
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Re: Fluke rubber capacitors.
Well, I pulled the display. That rubber was really stuck to the circuit board. I cleaned the solder pads and the end of the rubber. I tried to get the rubber off the contacts on the glass but it wouldn't come off. I was concerned about pulling the contact off with the rubber so I didn't push it. Put it all back together. Good news is it still works, bad news is no change, still looks washed out. It's still usable so I'll leave it alone. Thanks everyone.sigpicThe Sky Is FallingComment
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Re: Fluke rubber capacitors.
Did you use IPA? Sometimes it might take multiple cleaning applications to get it completely clean. If that doesn't work, then the original zebra strip may have degraded after 30 years.
I have read stories of people boiling their zebra strips to make them expand, but like modemhead, I have never tried it.
http://www.electro-tech-online.com/t...ectors.110678/
Another story I read is to add solder onto the pcb so that the contacts are raised a bit to make better contact with the old zebra strip. Right now, I can't find that post.
Sometimes I see replacement zebra strips being sold on ebay. Here is one for $20 USD + free shipping.
http://www.ebay.com/itm/191806766518
Is it worth $20 USD? Only you can decide.--- begin sig file ---
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Re: Fluke rubber capacitors.
Found the stories about adding solder to the pcb at modemhead's blog in the comments section
http://mrmodemhead.com/blog/fluke-8x-faded-lcd/
"Chris Kay says:
December 4, 2013 at 10:44 pm
just did the cleaning of the zebra strips on my 73 iii fluke meter I noticed the display pcb pads were not very even, or missing solder so i either sucked off clean a couple, added a little fresh solder, even up the height of pads, cleaned pads as well very well with iso as well as zebra strips and glass. display nice and dark like brand new."
"Adam Wong says:
August 8, 2015 at 12:38 am
I have a Fluke 12 DMM that is 25 years old. The buttons stopped working because an elastomeric connector wasn't making good contact with the PCB. Cleaning did not fix it. The way I fixed it was to “touch up” the PCB with solder making sure that the solder on the contact points was a little thicker than original. The idea was to increase contact pressure between the elastomeric and the PCB. DMM works perfectly now."--- begin sig file ---
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Hi, I have some 32 bits computer motherboards that need repair, as they fail to
power on.
Here are some examples :
(N.B. "capacitors" indicated here are electrolytic capacitors located in the onboard
switching supply area).
(N.B. #2 : I could not find a 3300 microF aluminum-polymer with a higher voltage
than 6.3 V.)
1 - Motherboard #1 : this is an Asrock K7VT2 (socket A) that still works well. To put it on test
I replaced capacitors with aluminum-polymer.
3300 microF/6.3 V. x 4 replaced by 3300 microF/6.3 V. (KYOCERA... -
hey all, iv got my favourite battery charger here which iv had for many years probably 15 years now or maybe even more. it still works good but thought id open it up to clean the dust out of it, lots of dust inside but now its clean and noticed 4 capacitors inside it and wondered if i should replace them.
it has inside:
2 x 47uf 16v caps 105c branded as Su'scon (lol sounds sus to me)
2 x 470uf 16v LZ105c branded as G.Luxon
not heard of these brands are they any good?
iv attached photos of the charger and the board inside for an idea on the type of... -
I did not have any 27uf @ 50 volt capacitors but one nice thing is that it has enough room for two capacitors in parallel a 22uf and a 4.7uf @ 50 volts 22 plus 4.7 equals 26.7uf which so very close to 27uf I will show some pictures of it sometime tomorrow
This is one of the shit est boards I seen in a very long time and it was the daughter board the traces just lifting off the board I had to use the capacitor leads to repair the the traces and the main board is not any better because I had to repair several traces for the daughter board to the main board
After all of... -
I have a 2007-era Panasonic VHS combo that is full of of Elna RJG capacitors. I am trying to test the capacitors to diagnose the machine and then select replacement capacitors but I can not find any datasheets for them. I did find a Elna catalogue from 2007-2008 but there is no mention of this capacitor series. Where these specially made for Panasonic and so not made available to the public? Any ideas what to find out what the ESR values should be without the datasheets? They are all between 10V and 50V and 47uF and 1800uF. None are leaking or bulged but I know that they need to be tested to be... -
I picked up a 70" Samsung UN70TU7000WXZA. The original owner said they were watching it when the power surged and knocked it out. I pulled the back off the TV and disconnected the main board from the power board, and the LED backlight came on, which I was told meant the power board was good. When everything is plugged in the standby light will not come on, looking at the main board BN94-17775A with a thermal imaging gun I can see one of the chips labeled 3202 is 251 degrees F just sitting idle. I found a replacement board, BN94-16115X; this board has the same symptoms, except it is a different...
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