Parallel attachment printing problems Make sure your printer driver is installed and connected to the correct port. Also, make sure you use properly shielded and grounded cables and
connectors (IBM part number 38L1409 or its equivalent) that are no more than
ten feet (3 meters) in length. Blank pages, double sheet feeds 1.   If all sheets are blank, the toner supply could be low without the toner       sensor detecting it. Replace the toner cartridge. See “Changing the Toner
      Cartridge” on page 130 for instructions on removing and replacing the
      toner cartridge.
2.   Random blank pages during a print job can be caused by multiple sheets of paper being fed through the machine simultaneously. Turn the paper
over and feed from the other edge or reload the paper tray with fresh, dry
paper. Fan the paper before loading it. If the problem still exists with the new toner cartridge installed, consider
replacing the usage kit. See “Changing the Usage Kit” on page 133. Paper jams in the printer repeatedly 1.   Make sure that the paper tray guides are adjusted correctly for the size       paper you are using.
2.   Do not refeed the same sheet of paper.
3.   The paper you are using in the printer may not be compatible with your       printer. Verify that the paper you are using conforms to the specifications
      for the printer. See “Selecting Paper and Other Printable Material” on
      page 31.
4.   Check for obstructions in the paper path. Obstructions may include paper       clips and corners of previously jammed paper.
5.   Check the paper supply tray for damaged paper.
6.   Turn the paper over and feed from the other edge or reload the paper tray       with fresh, dry paper. Fan the paper before loading it.
7.   For duplex jams, ensure that the duplex unit is installed correctly. See “The       Duplex Unit” on page 173.
8.   If nothing else works, you may need to replace the paper feed rollers. Paper feed rollers are included as part of the usage kit. See “Changing the
Usage Kit” on page 133. The printer takes too long to start printing The printer is frequently “warming up”. Change the value for the power-saving mode (or sleep mode) to a larger
value. 194    Infoprint 21: User’s Guide