Epson LQ-2500 User Manual page 95

If you define characters in one mode, such as draft, then switch to
mother mode, such as Letter Quality, the command will be ignored and
LQ
the will print in the currently sekxted font. The user-defined
character definitions, however, remain unaffected. If you switch back to
the mode in which they were defined, you can then select and print
them.
Keep in mind that user-defined characters are stored in RAM, which
is not permanent. Whenever the printer power is turned off, all of the
user-defined character are lost. Also, your computer sometimes sends
an initialization (INfT) signal, which wipes out all userdefined
characters. (Some computers do this each time BASIC is loaded.)
However, if you've saved your userdefined program correctly you can
reload the new characters any time you want.
Draft plca
6-20
Letter Quality
and Proportional
Graphics and User-defined Characters