Ricoh D131 Service Manual page 604

2507 ID Sen Patt Du
1 Operation Setting
Determines whether an ID sensor pattern is created during copy jobs.
[0 to 1/0/1]
0: Off
1: On
2 No. of Sheets
Selects the interval (number of copies) between ID sensor patterns when 1 is
selected for SP2507-001
[1 to 10,000/100/1]
2602 PTL Setting (1st /2nd Copy Side)
Turns the PTL off and on. The PTL (Pre-Transfer Lamp) decreases the charge
on the drum to make better separation of the paper from the drum, and
prevents stripper pawl marks on the leading edges of copies.
Note:

The PTL operates only when copying with plain paper or translucent paper.
It does not operate when copying with OHP, index sheets, or thick paper.

If blurring occurs in images at the leading edges of copies, switch
SP2602-001 off (set to "0").
1 1st Side ON/OFF Setting
Turns the PTL lamp on/off during transfer to the front side of the paper at
normal speed. This setting is always off when thick paper or OHPs are fed.
[0 to 1/1]
0: Off
1: On
The timing can be adjusted with SP2602-002.
SM Appendix 3-29
SP2000 Drum
D131/D132/D133