Troubleshooting The Network; Overview; Checking The Connection Of The Network Cable; Using A Loopback Address - Canon iR C6800 Series Service Manual

Chapter 2

2.4 Troubleshooting the Network

2.4.1 Overview

Go through the steps herein only if the machine is connected to a network.
If the machine's connection to the network fails, suspect the following causes:
a. The connection between the network and the Ethernet PCB is faulty.
b. The machine's TCP/IP settings are incorrect.
c. The Ethernet PCB is faulty, or is not mounted correctly.
d. The network is faulty.
To identify the cause, go through the following:

2.4.2 Checking the Connection of the Network Cable

1) Check to see if the network cable is correctly connected to the Ethernet PCB.
If yes, go to the next check.
If no, correct it, and run a check using the remote host address once again.

2.4.3 Using a Loopback Address

A loopback address comes back before it reaches the network PCB; as such, you can find out whether the machine's
TCP/IP settings are correct by executing PING using a loopback address.
1) Enter a loopback address (127.0.0.1) in the appropriate PING field.
If the result of the check is not good, check the machine's TCP/IP settings once gain, and execute PING once again.
If the result of the check is good, go to the following check.

2.4.4 Using a Local Host Address

A local host address is the machine's IP address, and it comes back after reaching the network PCB when you execute
PING, enabling you to find out whether the network PCB is normal.
1) Enter the machine's IP address in the appropriate PING field.
If 'NG' is indicated, go through the following check/remedy, and execute PING once gain:
a. The machine's IP address is not correct: check with the system administrator to find out if the machine's IP address
is correct and valid.
b. The connection of the network PCB is faulty: check the connectors used to connect the network PCB.
c. The network PCB is faulty: replace the network PCB.
If 'OK' is indicated, suspect a fault in the user's network environment; contact the system administrator for
appropriate correction.
2-36
0002-6749
0002-6750
0002-6751
0002-6752