Ricoh Aficio MP2550B Service Manual page 1018

Overview
The pattern for each paper width is unique. Therefore, the copier/printer determines which
paper has been placed in the bypass tray by the signal output from the board. However, the
copier cannot determine the paper length from the by-pass tray hardware.
Display on the LCD
Paper Size
A3 SEF
B4 SEF
A4 SEF
D370
Display
10010000
11010000
11000000
10
Paper Size
B5 SEF
B6 SEF
A6 SEF
Display
11100000
00110000
10110000
SM