Ribbon Size; Ribbon Adjust - IBM 6400 Setup Manual

If you do not want to change the ribbon at this time, you may disable
RibbonMinder. If the ribbon is worn, the "Change Ribbon" message will
reappear once the function is enabled again until the ribbon is changed. If a
fault message is displayed on the control panel and the Ribbon Fault is set to
New Ribbon, the ribbon percentage automatically resets back to 100% when
the ribbon is changed.
If the message display indicates the need to install a new ribbon and your
print job is one page short of completion, press Stop and then Ready to clear
the fault and print the last page. Otherwise, you may continue your print job
at the end of this procedure. The fault will occur again two minutes after
clearing the fault.

Ribbon Size

RIBBON SIZE specifies the length of the ribbon installed. When installing
or replacing a ribbon, you can adjust the ribbon size by using the Ribbon
Size option.
The default ribbon size is 100 yards. The size can be adjusted from 1 through
255 yards.
Pressing the Scroll key increases the ribbon size, while pressing the
Scroll ± key decreases the ribbon size.

Ribbon Adjust

RIBBON ADJUST allows the printing of more or less pages before the
display reaches 0%.
The adjustment is a percentage of the default (0%) and ranges from –99%
through 99%. For example, if the printer ordinarily printed 1000 pages at the
default setting (0%), by setting the adjustment to 10% it would print 1100
pages (1000 + 10%) before the display reached 0%. Likewise, if the
adjustment was set to –20%, it would print 800 pages (1000 – 20%) before
the display reached 0%.
Pressing the Scroll key increases the percentage, while pressing the
Scroll ± key decreases the percentage.
7–6 6400 Line Matrix Printers Setup Guide, Cabinet and Pedestal Models