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TCP/IP Troubleshooting
WorkCentre 7425/7428/7435
System Administrator Guide
193
TCP/IP Troubleshooting
Use the following check list to troubleshoot your network communication problem.
Check Physical Media and Network Interface Cards
1. Verify that the printer is on.
2. Verify that the printer and Computer are using the correct cabling to communicate over the
network. Use category 3 UTP patch (not crossover) cable for 10 Base T communications, category 5
UTP patch (not crossover) cable for 10 Base T / 100 Base TX communications, and Token Ring
cabling for Token Ring networks.
3. Verify that the cable at both the printer and Computer is fully plugged into the Network Interface
Card (NIC). Check the light, which is typically a green LED, to make sure that it is lit. Typically, but
not always, a second light on the Network Interface Card will be intermittently flashing, indicating
the presence of network traffic. If neither of these lights is lit, there is a problem with the NIC.
At the Printer
1. Print a Configuration Report. Under the Ethernet Rated Speed data label on the List, verify that
your communications speed is correctly set for your network and that you have a MAC address
listed. The driver for your NIC works at the Media Access Control (MAC) layer of the protocol stack.
If no MAC address is shown, you have either a bad NIC or no NIC at all. Replace or install the
Network Interface Card.
2. Under the TCP/IP data label, determine the method being used to assign TCP/IP addressing to the
printer. Specifically note the Mode being used. IP version 4 is the traditional mode using address
formats of xxx.xxx.xxx.xxx. Verify that the IP Address, Subnet Mask, and Gateway addresses are
correct for your network and have not changed from their previous settings.
Note: The use of DHCP (the DHCP Server) with a short lease time can cause the printer to be assigned
a new IP Address when it is powered off for an extended period of time. This will interrupt
communications with computers using the old IP address. If you do not want the IP address to be
subject to constant changes, either increase the lease time at the DHCP Server, or use the Static IP
Addressing method. For more information see TCP/IP Protocol Configuration on page 43.
3. Under the LPD data label, if you are communicating with the printer through an LPR port, make
sure that LPD is Enabled. Also verify that the displayed port number is 515. For more information
see TCP/IP LPD Enablement on page 46.
4. Under the Port 9100 data label, to enable the printer to automatically determine the Page
Description Language to use in processing jobs sent over the computer's LPR port, make sure that
this Port is enabled. This is the meaning of the word raw when used to name the queue during LPR
port creation. For more information, see Configure Port 9100 (Raw Printing) on page 51.
5. Under the CentreWare Internet Services data label, verify that this feature is Enabled.