Bought a second 3458a recently, claimed working. Talked to the seller and seemed genuine and helpful. He dropped it of to my sisters house, she lived near by, and I picked it up.
Problem is I got it home and it wouldnt power on. So recently I opened it up to take a look and repair it, mostly looks clean, checking A6 board for issues but then...
On the A5 board, under the GPIB port, I found spew from a ruptured IEC EMI filter. The filter had been replaced, but the ass that must have replaced it didnt clean up the mess and as it appears to be a rather stubborn mess to remove happened many years ago. The previous owner never opened it so wasnt aware of this but never had problems with it.
I have tried cleaning it with isopropyl but its barely coming off. Its coming off the frame (& its caused a bit of corrosion) but any ideas on a safe way to remove this spew-now-glue from the A5 board (picture below)?
PS: A5 board is revB and A6 board is RevA (and has a couple bad caps), latest date code suggests manufactured after april 1994