HP 3100 HP LaserJet 3100 - Product User's Guide, C3948-90970 - Page 206
The HP LaserJet 3100 product cannot, interface card is strongly recommended.
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Problem Cause Solution You received a message on the computer screen that there was an error printing to one of the COM ports. You may have the wrong type of parallel port, or it may not be properly connected to the computer. Be sure that you have connected the parallel cable that came in your package to the correct parallel port on the back of your computer. If you have another parallel port, try attaching the parallel cable to the other port. Make sure you have an SPP- (bi-directional) or ECPcompliant parallel port on your computer. An SPP parallel port is the minimum; an ECP parallel port is strongly recommended. For more information on your parallel port, please see appendix C and your computer's documentation. Another device is conflicting with the parallel port. The HP LaserJet 3100 product cannot share a parallel port. If you have a sound card, external hard drive, or network switchbox connected to the same parallel port as the HP LaserJet 3100 product, the other device may be interfering. You must unhook the other device to connect and use the HP LaserJet 3100 product, or you must use two parallel ports on the computer. You may need to add another parallel interface card. An ECP parallel interface card is strongly recommended. Please see appendix C or your computer's documentation for information on installing an additional parallel interface card or resolving conflicts. The image or words on printed pages is the wrong size. The N Up feature is selected in the program you are using (if it has this feature), or the reduction/enlargement setting is incorrect in the program or printer driver. Check the settings in the program you are using or in the printer driver. See the online help for printer driver issues. EN 9 Troubleshooting and Maintenance 205