Ricoh FW780 Service Manual page 124

Code
Roll feeder.
PJ90 motor does not turn off after paper is fed 500 mm more
than the maximum paper length.
Registration sensor does not turn off after paper is fed
PJ98
2500 mm.
Original registration sensor does not turn off after paper
PJ99
is fed 2500 mm.
NOTE: To display total jam number, access SP mode No. 80.
A163
Cause of Jam
4-32
SP Mode No.
SP80
(Others)
SM