Troubleshooting; Verifying The Printer Components; Power Source Verification; Printer Verification - Intermec 6820 Technical Reference Manual

Troubleshooting and Diagnostics

Troubleshooting

The printing system is composed of four basic components: Printer, Computer,
Power Source, and Communications. Any one of these components can prevent
the printer from functioning properly.

Verifying the Printer Components

Power Source Verification

Start by verifying that power is available at the printer. Visually inspect the
control panel to verify that the power indicator (Green LED) is lit. If it is not,
press the SET PAGE button and note if the power indicator lights up. If it does,
the power system is all right. If it does not, press the printer reset button. If the
power indicator still does not light, check the power cable, by connecting it to a
different printer. If the power indicator works on the new printer, then the cable
is all right, and the printer that was originally connected is suspect. If it does
not light, then the problem is most likely the cable or the power source.
Depending on the results, either replace the cable or return the printer for
service.

Printer Verification

If the power indicator works properly and the printer still does not print, then
printer errors are noted. If any indicators light when the SET PAGE button is
pressed, or the printer beeps, then refer to Table 4-1, Printer Failure Indicators,
to determine the problem.
If none of the listed conditions are indicated by the beep codes and LEDs, yet the
printer does not perform properly, then perform a printer self-test. Press and
hold (for several seconds) the FORM FEED and SET PAGE buttons at the
same time, until the printer beeps and all indicator lights come on. The lights
change throughout the test, as it progresses.
At the end of the self-test, the printer generates a report. This report verifies the
following: errors detected during self-test, the error history, and the
communication configuration. If the printer self-test report does not print, then
the printer should be reset. If the report does print after resetting, then the
printer is all right and the reason the printer does not respond to host computer
print requests is probably communications or host computer related. If the
report is partially completed, and a printer error occurs during the printing of
self-test, refer to Table 4-1, Printer Failure Indicators, for the cause of the printer
failure.
Perform a Power On Self-Test (POST) to test for errors either by resetting the
printer or powering it up. If any errors, audible error codes, along with indicator
light status, are produced during POST (see Table 4-2, POST Error Codes).
If the POST completes without error, try the printer self-test again. If self-test
prints correctly this time, but the printer does not respond to the host computer,
then the problem may be communications or host computer related. If errors are
encountered during POST, contact the Customer Response Center for assistance.
Communications / Host Computer Verification
Use the self-test report to verify that the communications protocol options,
selected at the printer, match those expected by the host. If they do not match
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