Troubleshooting The Network; Checking The Connection Of The Network Cable; Making Checks Using A Loopback Address; Making A Check Using A Local Host Address - Canon iR C3200 Series Service Manual

Chapter 2

2.4 Troubleshooting the Network

2.4.1 Troubleshooting the Network

Go through the following steps only if the machine is connected to the network:
If the connection to the network is not correct, you may suspect the following:
a. poor connection between the network and the Ethernet PCB
b. wrong TCP/IP setting on the machine
c. faulty Ethernet PCB or poorly mounted PCB
d. faulty user network

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 the connector is normal, make a check using the PING function and a loopback address or a local host address.
- if not correct, try a check once again using a remote host address.

2.4.3 Making Checks Using a Loopback Address

A loopback address returns before it reaches the network PCB; therefore, executing PING using a loopback address
will enable you to find out whether the TCP/IP settings of the machine are correct.
1) Enter the loopback address (127.0.0.1) to PING.
- if the machine indicates 'NG', check the TCP/IP settings of the machine once again, and then execute PING once
again.
- if the machine indicates 'OK', check the local host address.

2.4.4 Making a Check Using a Local Host Address

The local host address is the IP address of the machine; therefore, executing PING using the local host address, which
returns after it has reached the network PCB, enables you to find out if the network PCB is good or not.
1) Enter the IP address of the machine to PING.
- if the machine indicates 'NG', make the following checks/corrections, and execute PING once again.
a. faulty IP address of the machine: check with the system administrator to find out if the IP address (and its settings)
assigned to the machine is correct.
b. poor connection of the network PC: check the connectors associated with the network PCB.
c. faulty network PCB: replace the network PCB.
- if the machine indicates 'OK', suspect a fault in the user's network environment. Report to the system administrator,
ask for corrective action.
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