Printer and Photocopier Troubleshooting and Repair Collection : Smudged vertical line on HP Laserjet III
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Smudged vertical line on HP Laserjet III

(From: Dan Bourque (danbou@nbnet.nb.ca).)

The common problem with these printers is that the fuser drum gets scratched by the heat sensors of the fuser assembly which gets dirty with toner. Take a look at the drum of the fuser if the protective coating was scratched to the metal. If this is the case then the fuser needs to be replaced (around $80.00 for refurbished). If the protective coating is not scratched to the metal then the fuser can be removed and disassembled to clean the heat sensors. Use alcohol and Q-tips to clean.

To print a test page hit the On_Line button to put it off-line and then press test button for about 5 seconds.