If you have the kindle version and you’re having trouble seeing the charts or schematics (likely on the older kindles), you can view or print them from your browser. Here’s how:
Log in to Amazon.com, hover your mouse over Your Account (top right corner) and click Manage Your Kindle. You’ll see a list of your kindle titles. Under Actions for the title, click Read Now. Go to the chart in question. Click ctrl/command and + (or zoom from your View menu) as much as necessary to zoom in and make the chart bigger. You can even print from there.
I just tried it on my desktop and was able to print the chart.
You can also double-click charts on your ipad to enlarge them.