Ricoh B286 Service Manual page 565

Also, two other sensors detect roll end if the core of the paper roll is a color other than
black:
! Roll end sensor 3 (EXP) [C] detects the trailing edge of the roll when roll 1 has no more
paper.
! Roll end sensor 4 (EXP) [D] detects the trailing edge of the roll when roll 2 has no more
paper.
The machine also detects roll end if the RF exit sensor [E] does not detect a leading edge
after paper feed starts.
! If the leading edge of the sheet does not get to the paper exit sensor from Roll 1 in 3.2
seconds or less, the machine detects paper end (or roll not installed).
! If the leading edge of the sheet does not get to the paper exit sensor from Roll 2 in 6.7
seconds or less, the machine detects paper end (or roll not installed).
SM
Paper Feed and Registration
6-57 B286/B289