User's Manual

Troubleshooting and Diagnostics
Chapter
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7
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6820 Series 80-Column Printer User’s Manual
Compatibility Issues
Use the following information to determine some compatibility issues that
come up relative to the 6820 Printer:
Compatibility Issues and Conclusions
Issue Conclusion
Does 4820 Ribbon work with 6820 Printers? Yes.
Do 4820 Applications work with 6820 Printers? Yes. Applications that work on the 4820 Printer also work
on the 6820 Printer.
Does the 6820 Printer work with an application that
downloads some custom characters to the printer?
Yes. The “downloadable character set” feature is the same
for both the 4820 and 6820 Printers.
Can 4820 Fixed Mount Printers be replaced with 6820
Printers?
Yes. 6820 Fixed Mount Printers can be installed on exist-
ing flat and angle mounts for the 4820 Printer.
Do NC4000 Power Supplies work with the 6820 Printer? In some cases, printing while charging mobile computers
may not be supported. If so, order a new charger (P/N:
851-027-003).
Do off-the-shelf 25-pin cables work between the dock and
the 6820 Printer?
Most likely. If it does not, refer to comments in Problems
and Solutions, above.
Diagnostic Information
Nonvolatile Flash Storage
Diagnostic information is stored in flash to support the h ardware configu-
ration, both at time of manufacture and in the field. This includes record-
ing the initial configuration changes to hardware and software, and various
environmental statistics helpful in determining why failures are occurring
in the f ield. The flash is provided for storage of critical data that must re-
main in the unit after power to the unit is lost. The data in the flash is
used for diagnostic information for a catastrophic failure, or over the
phone with a customer.
Updating Diagnostic Information
The FLASH diagnostic information is updated and maintained by the
printer. All diagnostic information is shadowed in RAM. At the end of ev-
ery 50 forms, the FLASH information is updated from the RAM. The
printer a lso updates the information upon the occurrence of any nonrecov-
erable error, printer reset, printer self-test and remote polling of Diagnostic
information.
Fields are stored with ID first, then length, then data. The details of the
data and the length of the entire field, including ID and Length bytes, are
showninthetableonthenextpage.