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Unit 5: Troubleshooting
Lt408 Operator Manual
5-9 PN: 9001152A
LAN ETHERNET INTERFACE
CHK TROUBLESHOOTING STEP
Ensure the interface has been correctly configured. Wait two minutes and run self-test to verify. If a test label does not
print, there may be a hardware problem.
Ensure the cable and its ports are not defective.
Ensure that a faulty print server or other protocol related scenarios are not creating a queue setup issue.
Systematically perform checks and tests to isolate the cause.
If using TCP/IP, ensure a valid IP address is specified and that all parameters are correct (subnet mask, gateway,
etc.). Attempt to PING the IP address assigned to the network interface.
If using a repeater or hub, ensure the SQE is turned off. Also ensure the repeater port is not defective by trying the
print server on another port.
Install the IPX/SPX protocol on a workstation to determine if the network device can be discovered via the MAC
address. If able, configure the appropriate protocols and retest connectivity.
Use a crossover cable to isolate the printer from the network by connecting from the interface and workstation. Verify
that the parameters match on each. Test connectivity.
WIRELESS LAN INTERFACE
CHK TROUBLESHOOTING STEP
Ensure the interface module is correctly installed. Run self-test to verify.
Check the signal strength by the three LED’s on the interface. The more LED’s are illuminated green, the stronger the
signal.
Ensure the printer is receiving information from the computer using the Receive Buffer Hex Dump mode. Refer to that
procedure within this manual for instructions. The command stream should be continuous and possess 0Dhex and/or
0Ahex (carriage return and line feed) characters throughout. However, there should not be either located between the
start (<ESC>A and the stop (<ESC>Z) commands.
Ensure the interface has been correctly configured. Wait two minutes and run self-test to verify. If a test label does not
print, there may be a hardware problem.
If using TCP/IP, ensure a valid IP address is specified and that all parameters are correct (subnet mask, gateway,
etc.). Attempt to PING the IP address assigned to the network interface. Also ensure the SSID, channel, and security
matches that of the network.
Install the IPX/SPX protocol on a workstation to determine if the network device can be discovered via the MAC
address. If able, configure the appropriate protocols and retest connectivity.
Replace the interface board with another to isolate the problem.
Replace the interface board permanently if determined to be the problem. Also reset the interface card.
CENTRONICS INTERFACE
CHK TROUBLESHOOTING STEP
Ensure the interface module is correctly installed. Run self-test to verify.
Ensure the printer cable is connected to the appropriate LPT port on the host computer. If using a Windows printer
driver, ensure the correct port is selected.
Ensure the host’s peripheral settings are set for Centronics output for faster throughput. Refer to the computer
manufacturer’s documentation for details.
Ensure the printer is receiving information from the computer using the Receive Buffer Hex Dump mode. Refer to that
procedure within this manual for instructions. The command stream should be continuous and possess 0Dhex and/or
0Ahex (carriage return and line feed) characters throughout. However, there should not be either located between the
start (<ESC>A and the stop (<ESC>Z) commands.
Replace the interface board with another to isolate the problem - permanently replace if defective.