[volt-nuts] 03458-90101 Manual Set

Bill Gold wpgold3637 at att.net
Sun Oct 9 23:19:44 UTC 2011


    Just for your FYI, there is a scanned copy of the 3458A CLIP on this website.

    I have the "official" Agilent printed copy and this one looks very close as far as I have checked.

    Also another FYI for anyone with a dimming front panel display, and I had one with several alpha/numberic segments going very dim.  I decided to replace the actual display, P/N 2090-0217 U1 Front Panel Display, for $80 rather than pay something like $500 for a replacement board.  I am quite capable of doing this sort of delicate work.  It involved unsoldering 54 pins and then removing the old IC and then soldering in the new IC display.  I had already done the NVRAM replacements on two each 3458 with through holes with a total of something like 160 pins to unsolder and then resolder in IC sockets with no problems.

    The new 2090-0217 had the lead placement at a width of around 1.55 inches, where as the old part had a lead width of 1.4 inches.  This was, of course, after I had removed the old IC and was ready to install the new IC.  I had to very carefully bend or reposition the leads on the new part inwards so that they would fit the 1.4 inch hole pattern on my Front Panel Display board, 03458-66507.  I did check carefully that the new part had the same number and placement of leads as the old part and other dimensions.  It took me about 2 hours of very careful work bending and then getting the leads to go into each of the 54 holes.  But in the end the whole thing fit and works perfectly with a very bright display now.  I don't know if the PC boards on the newer units, 03458-66517, have a wider pin spacing than the original boards.  I really don't see how the new boards could, as there is virtually no room to increase the pin width and still get the correct positioning of the display IC.

    I don't know if Agilent just incorrectly specified the new ICs, as they now come from Samsung, or if there is something else I just don't know about how the new PC board's U1 pin holes are positioned.

    Not a job for the fumble fingered.


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