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I always use HP printers and every time i get a new operating system (vista, win7 etc) the HP software does not fully install. I go to HP.com to install the latest software for the appropriate OS but rarely get more than just the printer working. If i require the scanner or cd print features i have to do that from an older computer or older operating system that the printer was originally installed on.
On the top of the scanner mechanism, there is a black tab that gets
caught on the underside of the scanner surface, just beyond the glass,
towards you. You will hear a gear grinding sound, that"s the tab getting
caught. either bend the tab down, or remove it. Its on the black cover
that"s on top of the scanner mechanism. Also remove any tape that is on
the bottom of the trailing cable under the scanner that prevents it
from moving all the way to the left.
I recently had the same problem, and it is a very easy fix. What you have to do is remove the top and clean the underside of the glass. There is a white strip that lets the scanner know its in the home position. Pop off the control panel cover. Remove the 3 torque screws in the rear and the one on the right. VERY carefully release the buttons for the control panel with the tabs in front and slide out, careful there is a control ribbon underneath so be gentle. Then from the front there are tabs on each side to release the top. Clean glass and replace, should work good as new.
Re carriage error - suggest cleaning the encoder strip. this is the plastic strip running parallel to the drive belt but about 1 inch above it. They frequently become covered with ink spray and so are impossble to read by the carriage position detector.
Only use cold water and be very gentle. also make sure you dry the strip thoroughly before switching the machine back on.
Re scanner problem 2 possibilities.
(1) make sure printer power cable is connected directly into wall socket not through an extension cable. This can reduce the voltage getting through to the scanner lamp.
(2) if that don,t work then I suggest you take the scanner apart and clean the reference strip. this is a white bar on the scanner glass which tells the machine what the light level is. This can be a bit tricky so if you've never done it before consult someone who has or get back in touch with me. HP don't want you to do this but it sometimes works.