Ricoh Aficio MP201SPF Service Manual page 500

Bit Switches
T0 timer adjustment
Bit 5: 0, Bit 4: 0 = 75 sec
4-5 Bit 5: 0, Bit 4: 1 = 120 sec
Bit 5: 1, Bit 4: 0 = 180 sec
Bit 5: 1, Bit 4: 1 = 240 sec
6-7 Not used
D115/D116
Adjusts the fail safe timer. This timer sets the
interval between "setup" data transmission
and T.38 phase decision. If your destination
return is late on the network or G3 fax return
is late, adjust the longer interval timer.
The default is "00" (75 seconds).
Do not change these settings.
5-62 SM Appendix