Ricoh D129 Service Manual page 279

Main SP Tables-4
Scanner Free Run
4013
Performs a scanner free run with the exposure lamp on or off.
001 Lamp: OFF
002 Lamp: ON
4014 Scan
001 HP Detection Enable
002 HP Detection Disable
Dust Check
This function checks the narrow scanning glass of the ADF for dust that can
4020*
cause black lines in copies. If dust is detected a system banner message is
displayed, but processing does not stop.
Dust Detect: On/Off
Issues a warning if there is dust on the narrow scanning glass of the ADF
when the original size is detected before a job starts. This function can
detect dust on the white plate above the scanning glass, as well as dust on
the glass. Sensitivity of the level of detection is adjusted with SP4020-2.
001
[0 to 1 / 1 / 1]
0: Off. No dust warning.
1: On. Dust warning. This warning does not stop the job.

002 Dust Detect: Lvl
D129/D130
Scanner free run with HP sensor check.
Scanner free run without HP sensor check.
Before switching this setting on, clean the ADF scanning glass and
the white plate above the scanning glass.
[0 to 1 / 0 / 1]
0=Off, 1=On
5-20 SM