SOURCE: 943 service print head error
sounds like a mirror motor error(this is the laser mirror that spins very fast 20k rpms, you hear the sound when its about to print ,sounds like a jet spinning up). In this case you will need a pro to look at it or replace the machine....
SOURCE: have lexmark Pro705 printer, stuck
You
won't be able to update the firmware of your printer if you have an
error message on the LCD screen of your printer. You need to get rid of
the error message first before applying the firmware update.
Please click on the link for the steps: http://bit.ly/mDKqh7
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