Electronics > Repair

Fluke 8600A - carbon resistors and tantalum caps, should they be changed?

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kblue:
Will report back, once everything is installed. Thanks again for your help!

/edit: As i dont have "Tantalum" caps on hand, some notes of these 78XX and 79XX say: "if tantalum isn't available, use electrolytic aluminum 10x higher than value given" so i used 22 uF for the 79XX and 3,3 uF for 78XX both with very low ESR. The "typical application" for 7815 had 0,22 uF in mind so 2,2 uF will be the 10x higher value (as i don't have 2,2 i used 3,3 instead) same goes for 79** "typical application" uses a 2,2 uF (times 10 its 22).

As there are no usable traced nearby, guess i need to make my own for the output-capacitors. What am i thinking? There are already Caps on the output side (on the main PCB).

kblue:
The +15 / -15 V IC is changed / switched for dedicated +15 and -15 regulators. Everything works fine so far, except for something little. Down in the 200 (mV/uA/Ohms) Range and up to the 20-range (for every kind of input) i see numbers with shorted inputs. So i cleaned the switches with IPA and numbers went down but still not quite zero (e.g. 00,02 to 00,03 in VDC 200 mV range // 02,75 in VAC 200 mV range // 00,02 in Ohms 200 range etc pp). I also cleaned all PCBs with IPA. Mayhaps i try dedicated PCB cleaning materials.

kblue:
After letting the unit run for hours, DCV and Ohms are 00,00 with shorted plugs. If i turn the unit off for some more hours and back on again its 00,00 from start. So the "problem" whatever it was, solved itself. Except for VAC which still shows 02,60 - 02,75 in 200 mV range with shorted plugs but this could be some sort of noise i guess.

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