Brother HL-2060 User Manual page 108

Note
Even if you set the resolution to more than 300 dpi in this mode, the
printer may not be able to print large files at your selected resolution
because of insufficient memory. However, it automatically decreases the
higher resolution that you set to 300 dpi to print them. While the printer is
printing, the display prompts "01 PR300 ... "
If the printer cannot print files even at 300 dpi, the "MEMORY FULL"
error occurs. See "TROUBLESHOOTING" in Chapter 7.
This automatic resolution decrease function works in the BR-Script 2
mode and other emulation modes with the page protection on.
"PAGE PROTECTION" in this chapter.
When you want to print without decreasing the resolution, you must
expand the memory capacity of the printer.
Expand the memory capacity referring to the table below. It shows the
minimum size of memory required in the BR-Script 2 mode.
Paper Size
Letter or A4
Legal
(Duplex printing)
For memory expansion,
the dealer where you purchased the printer.
300 dpi 600 dpi
4 Mbytes 6 Mbytes
4 Mbytes 6 Mbytes
4 Mbytes 10 Mbytes
see "RAM EXPANSION" in Chapter 5
CHAPTER 4 CONTROL PANEL
See also
1200 dpi
16 Mbytes
16 Mbytes
or consult
4–33