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HP LaserJet 3100 Product - Sharing an LPT Port

ISSUE: This document provides information on the results of using an HP LaserJet 3100 product and an HP Deskjet series printer connected to the same port (LPTx). Error messages are received from the HP Deskjet series printer driver software. One or more of the following error messages are displayed:
  • Printer Port Problem, there is problem accessing the printer port.

  • Printer Not Responding, attempting to send data to the printer and the printer is not responding.

  • There was an error writing to lpt (x) for the printer (HP Deskjet XXXC series): the parameter is incorrect.

    NOTE: This issue has been reported by customers to also occur with HP Designjet printers
SOLUTION: The permanent resolution is to install an additional LPT port in the computer. Connect the HP LaserJet 3100 product to LPT2 and the HP Deskjet printer to LPT1.

The HP LaserJet 3100 product is designed to operate on a dedicated port. This is stated on the box of the HP LaserJet 3100 product in the section where the system requirements are listed. The HP LaserJet 3100 product's User's Guide also states the need for a dedicated port in the Setup and Troubleshooting sections. Sharing an LPT port or the operation of the HP LaserJet 3100 product through a switchbox is unsupported.

WORKAROUND: The following workarounds for releasing the existing port are available if an additional LPT port can not be installed in the computer.
NOTE: These workarounds are only available in Windows 95, Windows 98 and Windows Millennium Edition (Me). The HP LaserJet 3100 must have a dedicated parallel port in Windows NT, Windows 2000 and Windows XP operating systems in order to work properly.

Temporary Port Release Option 1

If it is not possible to install a separate LPT port on the computer, follow the steps listed below. These steps must be performed each time the computer boots up or after any HP LaserJet 3100 print job is sent. This must be done prior to printing to the HP Deskjet printer.

  1. Right-click the JetStat icon located next to the clock in the Windows taskbar. Select Exit Jetstat.

  2. Press CTRL + ALT + DEL to open the Close Program menu.

  3. In the Close Program menu, end task on MFPHELPR (help files) and JSFMAN (fax manager).

  4. Print to the HP Deskjet series printer.

Temporary Port Release Option 2

This option is more of a permanent option and removes the files from the start up group. Once steps 1 through 5 have been completed, the help files must be shut down per steps 6 and 7 to prevent any error messages or conflict after a computer boots up or after any HP LaserJet 3100 print job prior to printing to the HP Deskjet printer.

  1. From the Windows desktop, select Start and Run. Type JETSUITE.INI in the dialog box and select OK.

  2. In the JETSUITE.INI file, locate the [Startup] section.

  3. In the [Startup] section, locate the lines: Load2=jetstat.exe and Load1=jshelper.exe and place a semicolon (;) in front of these lines. For example ;Load2=jetstat.exe and ;Load1=jshelper.exe.

  4. Select File and Exit. When asked to save changes, click Yes.

  5. Select Start and Shut Down. In the Shut Down window, select Restart the Computer and click Yes.

  6. After Windows restarts, press CTRL + ALT + DEL to open the Close Program menu.

  7. In the Close Program menu, end task on MFPHELPR (help files).

  8. Print to the HP Deskjet series printer.

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