Ricoh A151 Field Service Manual page 213

Yes
Is the setting of SP30 "1"?
No Yes
Change the setting of SP30 from "1" to "0".
Go to A
Is the setting of SP33 "1"?
No Yes
Change the setting of SP33 from "1" to "0".
Go to A
Is the charge corona current correct?
No Yes
Readjust the charge corona current.
Go to A
Is the grid voltage correct?
Yes No
Readjust the grid voltage.
A
Clean the optics section and around the drum.
Turn on DIP switches 101-1 and 101-2 on the main board. Enter SP55.
Repeat the free run until Vsp becomes lower than 0.103 Vsg.
Perform the necessary SP modes in order (SP95, 48, 56 and 54)
FSM 6-19 A151/A152