Very good thread suggestion on 2465B I didn't know they are so similar to
my late 2445B 200MHz version
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On Sat, 6 Jun 2020, 16:43 , <tekscopegroup@...> wrote:
On Fri, Jun 5, 2020 at 12:55 PM, Ondrej Pavelka wrote:
P.S. I found 3 leaky surface mount electrolytic caps on the board I
think it's
referred to as a A board? I will change those to prevent further
corrosion
spread but what are they in charge of ? Could these be the reason for the
troubles?
Ondrej
It is actually 4 electrolytic caps in total on the A5 board that cause the
corrosion and need to be replaced. The 4th cap (33uF 10V) is located on the
top right side corner of the board (along the edge same side as the other 3
caps), right next to one of the hold down screws. Be sure to check/replace
that one as well even if it does not show any corrosion yet. Don't have the
SM here so can't tell you part numbers, but the 4th cap location is quite
obvious.
Regards your earlier question about saving the cal data of your NVRAM, it
needs to be carefully desoldered from the board and then read with a
programmer (I used the GQ-4X4, but there are other options as well). Once
the data is read and saved it needs to be programmed into a fresh NVRAM
chip (get it from Mouser, Digikey, etc. NOT from ebay). Then solder a low
profile socket onto the board, and insert your newly programmed NVRAM.
For lots of useful info and photos about replacing A5 caps, NVRAM
replacement, and anything else 2445/65/67 related take a look at this (long
running) thread at EEVBlog, specially if this is your first time inside the
scope:
