Author Topic: Fluke 87 IV Repair help!  (Read 538 times)

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Offline ZamagenTopic starter

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  • Country: jm
Fluke 87 IV Repair help!
« on: January 08, 2025, 09:19:20 pm »
Hello,
I've had this meter for a while, bought 2nd hand fully working, never had any problems.
Suddenly it started beeping continuously with each position of the dial; I've read the problem could be caused by dirty sockets, so
I desoldered, soaked in alcohol and resoldered the connectors.

Now it doesn't beep anymore, but it seems that the inputs are non functional.
I can't measure a DC voltage or a resistance, if I take another meter and measure the internal resistance between com and V/Ohm I get an open circuit, but according to other posts it should be some MOhms.

I can't see broken/missing parts and the resistors seem to be Ok.
Does someone have any possible hint on what could be the problem?
TIA.
 
 
 

Offline m k

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  • Country: fi
Re: Fluke 87 IV Repair help!
« Reply #1 on: Yesterday at 07:11:29 am »
Schematics for old version is available.

Have you assembled it correctly?
Advance-Aneng-Appa-AVO-Beckman-Danbridge-Data Tech-Fluke-General Radio-H. W. Sullivan-Heathkit-HP-Kaise-Kyoritsu-Leeds & Northrup-Mastech-OR-X-REO-Simpson-Sinclair-Tektronix-Tokyo Rikosha-Topward-Triplett-Tritron-YFE
(plus lesser brands from the work shop of the world)
 

Offline silly sausage

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Re: Fluke 87 IV Repair help!
« Reply #2 on: Yesterday at 03:13:48 pm »
regarding the input sockets, my 83v did the same,tried cleaning with no luck, in the end i unsoldered the socket block then put it inside a sock and threw it in my washing machine, then let it dry and refited it, its been fine since.
 

Offline ZamagenTopic starter

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  • Posts: 4
  • Country: jm
Re: Fluke 87 IV Repair help!
« Reply #3 on: Yesterday at 06:32:12 pm »

I'm pretty confident the problem is in the metal contacts inside the rotary switch.
But I've tried bending them back and forth so many times that one broke. Is there a source for compatible contacts?
 

Online coromonadalix

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Re: Fluke 87 IV Repair help!
« Reply #4 on: Today at 12:30:30 am »
you find them on Ebay at astonishing prices  per part ....  unless you find some 87iv 89iv 187 189  for parts  and they are there ??
 


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