hi jwh,
you should be able to enlarge pdf files one way or another. there are two different kinds of pdf files, however, and they won't work in the same way. the first one is a text pdf, which you can enlarge by modifying the font size, or by zooming in without changing the font size to preserve the page layout. this can be done via the same text size dialogue box, but it's a button above the font size buttons on the left side. you can also rotate the pdf to read in a landscape disposition which will help.
if the pdf is an image pdf, the sony sees it just like any photo or other image and can't read the text and therefore can't modify its size. in this case, the only option is to zoom using the image zoom (and possibly read in landscape disposition).
i hope this helps.
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