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you need to print clean page two or three times to clean printer path for toner , then check the last page you if there other black market , tell me , what black market looks like , hope that helped you
To automatically duplex, you need the optional duplexing mechanism. If you don't have this, your only option is to print the odd pages first, put the papers back in the tray, then print the even pages. When you put the pages back into the paper tray, make sure they are print side up. Try with a 5 or 6 page document first to be sure you get the orientation right.
If you HAVE the optional duplexing unit (which sticks out the front just above the main paper tray) then post a reply here and I'll try to help you further. 99% of the people that own this unit do NOT have the optional duplexer!
Print a configuration page. Press the Menu key until you see Information menu, press the item key until you see print configuration, then press the select key. A configuration page will print and you will also obtain the network information, unless there is a problem with the network card or circuit.
How are you connectiong it to the Mac? If you are using a USB to Parrell device, that may be the problem. The best and stable way to do it is by using the optional print server.
The 4100 has a formatter board on the left side of the printer (looking at printer from the back).This board has a slot for an optional EIO print server board. You can purchase this through HP and then set the printer up through your router/network.
See page 23 and page 150 of the user guide:
If you can do the following and email me the output I should be able to help you.
Print the event log
The printer’s internal event log stores the last 20 errors and can be printed at any time. To print the
1 Press MENU until INFORMATION MENU appears.
2 Press ITEM until PRINT EVENT LOG appears.
3 Press SELECT to print the event log.
check this link, either fuser or print drum. to verify , start print job, open door before finnished and see if marks appear before or after fuser. Before paper gets to fuser toner ink will smudge. http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=bpl70340#RepImgDef