[volt-nuts] Keithley 2001 Multimeter Fault - Update

[Brooke Clarke]

Hi Alan:

I'm importing and selling a combined ESR and capacitance meter. See:
http://www.prc68.com/P/Prod.html#ESR <- ordering
http://www.prc68.com/I/ESRmicro.shtml <- description
http://www.prc68.com/I/Capacitors.shtml <- measured results using a 
number of instruments

Have Fun,

Brooke Clarke
http://www.PRC68.com


Alan Scrimgeour wrote:
> Here's a progress report:
> Searching for a possible short circuited tantalum capacitor I tried to identify if any were connected to the 5V output of the overheating regulator. None on the visible side of the analogue pcb were. I dived in and removed the pcb and did a similar search of the tants on the rear. One, located right next to the regulator was connected. I replaced and tested it. It was a bit leaky, but ok, and the replacement made no difference.
> I started probing around with a thermocouple looking for overheating chips connected to the 5V supply, but couldn't spot any. Then I accidently discovered that 5 electrolytics in the vicinity of the overheating 5V regulator were also overheating. Unfortunately the pcb does have buried layers so it's not easy to tell what connects to what, and I cant get to connections on the rear of the pcb when it's powered up, so the whole process is proving rather frustrating. I think I'll try removing the electrolytics and if they're still ok, putting them back on long wire legs to allow me to access the powered up connections.
> Any bright ideas welcome!
>
> Alan
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