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Main PC board
MAIN4-R or greater MAIN3-R or earlier
Boot
program
earlier than
V3.0
When the boot program is sent to
the printer by the downloader, the
printer shows “MODEL TYPE
ERROR” on the LCD and results in
an error.
When the COM is used as the
interface, the downloader shows
“Check Sum Error”. (Then, the
printer is forcibly shut down.)
After the printer is restarted, it starts
up in the previous status
Downloaded normally.
Main
program
earlier than
V5.0
When the main program is sent to
the printer by the downloader, the
printer writes the program, shows
“FIRM VER. INVALID” on the LCD,
and results in an error.
When the COM is used as the
interface, the downloader shows
“Erase Error”. (Then, the printer is
forcibly shut down.)
After the printer restarted, it starts up
in the DOWNLOAD MODE.
Downloading the main program V5.0
or greater enables a recovery from
the erroneous state
Downloaded normally.