On 18/07/18 09:29, Craig Sawyers wrote:
I have had axial tantalum capacitors leak and destroy nearby PCB traces, specifically
C6246 and C6341 in a Tek 1502 TDR.
Interesting - must check mine. Wonder why they used them only on the +25V rail, which is only used on
the high voltage board, to feed the switching transistors on the primary of the HV transformer, but
regular electrolytics on the other rails? Noted that these wet tants are 30V parts on a 25V rail
(rated = 1.2 rail voltage), so is somewhat close to the wire.
It has only happened in 20% of my 1502s. I seem to have a
fetish for the damn things :)
ISTR the 25V rails are not low current, which might increase
the stress.
