HP Scanjet 4470 Teardown with Pictures

I’m in the process of cleaning out my room in preparation for my move to California at the end of this semester, so I decided to dig into my box of old electronic crap that I’ve been hauling around for a few years. In doing so, I ran across my trusty old Hewlett Packard Scanjet 4470 scanner that I’ve had since middle school. It hasn’t worked for a couple of years due to a bum power supply, but I managed to scrounge up another 12 volt supply and turn it on. It turns out that all these years of hauling it around have caught up with it, and it doesn’t scan very well anymore. I tried several scans with it, and they all came out with rainbow lines across them:

Scan of an IEEE publication I had laying around
Scan of an IEEE publication I had laying around

After reading a few forum posts, I came to the conclusion that the CFL tube used to front-light the media being scanned is on the fritz. Couple this with the fact that HP doesn’t have any drivers that will work with Leopard, and I decided it was time to retire the old scanner to the dumpster. Being a EE, I couldn’t resist tearing it apart first to see its guts, so I thought I’d share the results of that with you, and thus begins… Continue reading “HP Scanjet 4470 Teardown with Pictures”

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