Previously in the TEA forum:
https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/msg2995954/#msg2995954This is a little teardown of the Fluke 750A. I took it first, because there was some disturbing rattling noise coming from the inside.
Front, looks nice and clean:
![](https://i.imgur.com/Wl7T1fw.jpg)
The battery case is also clean:
![](https://i.imgur.com/XxITnH2.jpg)
Top view, and looking for the source of the noise:
![](https://i.imgur.com/6KqUP3M.jpg)
This debris is causing the noise:
![Sad :(](https://www.eevblog.com/forum/Smileys/default/xsad.gif.pagespeed.ic.L3FGyzQrjB.png)
![](https://i.imgur.com/dhRn3Ya.jpg)
Some nice wirewound resistors on top of an oil-filled resistor bank:
![](https://i.imgur.com/chBW8Aa.jpg)
No sign of leakage:
![ThumbsUp :-+](https://www.eevblog.com/forum/Smileys/default/icon_smile_thumbsup.gif.pagespeed.ce._JElyJQqdB.gif)
![](https://i.imgur.com/MKWFONM.jpg)
The note next to the bank:
![](https://i.imgur.com/qaurDWf.jpg)
A PCB with a relay (I think) on the right side (instrument is upside down):
![](https://i.imgur.com/InQn8a2.jpg)
Some very nice wire wound resistors:
![](https://i.imgur.com/mxfCMNT.jpg)
Rusty parts!
![Scared :scared:](https://www.eevblog.com/forum/Smileys/default/scared.gif.pagespeed.ce.oZptHNcbsD.gif)
![](https://i.imgur.com/AacGVNc.jpg)
![](https://i.imgur.com/rBj34sw.jpg)
![](https://i.imgur.com/La2CqaV.jpg)
Switches and resistors for the fine adjustment of the reference source (1.018V):
![](https://i.imgur.com/zasI6vM.jpg)
![](https://i.imgur.com/r1iRq30.jpg)
Output voltage switch. Here is the debris coming from:
![](https://i.imgur.com/KtfKA52.jpg)
![](https://i.imgur.com/iKe4qo4.jpg)
Actually, I have no idea how to repair that thing.
![Confused :-//](https://www.eevblog.com/forum/Smileys/default/confused0024.gif.pagespeed.ce.5xOqKkq0Co.gif)
If you have some suggestions, I'd be glad to hear them. Thanks.