HP 4570c scans totally black or bluish-green with vertical bars
Problems started out to be intermittent and I could solve it by unplugging the power source for 5 - 10 minutes and then restart the scanning. Now the unit will only scan very, very dark or totally black from a white document. I have been to the HP website and followed suggestions they offer, including the "homing" procedure outlined on this site. I have installed the newer version 2.0 software, still no improvement. I have ruled out electromagnetic problems because the scanner has been in the same location since 2004 and nothing has chaged at my desk. I even tried installing the software and connecting the scanner to a completely different model and brand computer; same problems. Great scanner, very reliable and good quality, until now.
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I assume you are using this with a computer. One thing comes to mind that relates to software. You should be able to do a preview scan of the whole scanner bed, then move the frame to the area you want to scan only, sort of like cropping the picture. If those crop borders are set to less than the whole document, you will get this kind of scan.
Now if that isn't the problem, the scanner likely has a electronic issue unless the scanner has had a nasty fall. If you want to really explore deep and don't mind if it doesn't work afterwards, turn the scanner off and unplug the power. Open it up just enough to access the optical unit and see if it will move the entire length of the scanner without binding where you experience the end of the scan. Go rather slowly and gently so you don't strip the toothed belt if it has one. You will feel a wierd sensation and some resistance as you move it along which has to do with the stepper motor and that's normal. If that works, it's likely it failed on it's own. If it binds where the scan ends, you'll have to investigate whether it's due to a rusty rail (hope not!) or some other obstruction.
Often the plastic will out gas and it will deposit a film on the glass. You might have to open it up and clean the inside of the glass with window cleaner. There is also a mirror in the scanner head. That can get fogged up too (in fact it gets fogged up more frequently than the glass plate). The trick there is to find the mirror below the slot and then clean it with a q-tip that has been dipped in alcohol.
Do you mean the green power light? I have the same brand and a similar scanner, and the light does always stay on. I think it is a normal function of the scanner. It may not be a good idea to unplug the scanner. I am going to be a bit more research so that we can both be reassured that this is normal.
I'll get back to you.