In the instruction manual there is a good troubleshooting/calibration section. In it they give you voltages and test points to look at. It is worth noting that the version of the manual on the Fluke web site that I have access to ( http://assets.fluke.com/manuals/8060a_3vimeng0200.pdf ) is for devices with serial number > 6851XXX. Mine has a serial number below that, so I found a version of the manual for my meter ( http://materiel-physique.ens-lyon.fr/BDD/job/BDD/Notices/N069-017.pdf )

It was a fairly simple matter to determine that the power supply section is faulty. The 5V rail is only at 3.6v At that voltage the -5v supply does not work at all. There is no obvious leaking capacitors and the Bat+ gets all the way to the JFET that is connected to the MCU. So, next step is to pull out the JFET for testing....

So the FET needs to be replaced. This here internet place never ceases to amaze me. it turns out that the user drtaylor on the eevblog actually worked on the original design team for the 8060A, so I believe EVERYTHING that he says about it. Here is a link to a thread about repair of this meter. In it he says that the JFET are " low RDS N-Chan Jfets. They were similar to a J106, but selected for Vgs Cutoff of -3 to -4.5V. If you get a few J106 parts, you can select them to make sure they fully cut off when Vgs is no more than -4.5". So, I did get a few and picked one that fit the bill. Power it up and yay! 5v at TP1. But no -5v at TP2. Now what?

The -5 v is generated with an ICS7660 and it has some critical components for its

operation; electrolytic capacitors, but I get ahead of myself. R34 is a small resitor and drops the 5.2V a bit and the resulting 4.9v is present on pin 8 of U4, but there is some small negative voltage at pin 5 (Vout) on U4 not the -5V we want. Since C21 is the charge pump capacitor for U4 I try replacing it first, but still no -5. So, I pull out U4 to test it out of circuit.

I load it onto a breadboard for testing and put some new capacitors along side it. And it produces a -5.2 v from a +5.2 v input. So I see if the old C21 was the culprit out of circuit and using it rather than a new one still produces the -5 so now I try replacing C34 and C35, slapping in U4 and a new C21 (just to be safe), and ...sucess!