Ricoh G147 Service Manual page 211

Use this SP to select a print test pattern. After you select any pattern other than
"0:None", this puts the printer in the Print Test Pattern mode. In the Print Test
Pattern mode, the test pattern can be printed by doing SP5990 (Print Mode)
which is normally used to print the SMC reports. For a more detailed description
about how to print a test pattern, see "Test Pattern Printing" in Section "5. Service
Tables".
Prt M Scan Mag.
2909
Adjusts the magnification in the main scan direction for print mode. Press [#Enter]
to toggle between + and - values.
002 Printer
2911 T Current Timing
La (On Timing)
001
Adjusts the transfer current on timing at leading edge.
Lb (Switch Timing)
002
Adjusts the transfer current switch timing. This determines when the leading edge
stops and the image area current begins (see SP2-301).
Lc (Off Timing)
003
Adjusts the transfer current off timing. (e.g. –5 mm is 5 mm after the trailing edge.)
2912 Drum Rev Rot In
Adjusts the time the drum and belt are reversed in order to prevent paper dust
and toner from collecting at the blade. DFU
[0 ~ 10 /3 / 1 step]
Example 1: If you enter 3, then:
3/2 = 2 (rounded up) x 10 + 10 = 30 ms
Example 2: If you enter 10, then:
10/2 = 5 x 10 + 10 = 60. However, the limit is 50 ms so in this case, 60 ms is
SM
Main Scan Magnification
[–2.0 ~ +2.0 / 0 / 0.1% step]
Transfer Current On/Off Timing
[–30 ~ +30 / 0 mm / 1 mm step]
[0 ~ +30 / 10 mm / 1 mm step]
[–30 ~ +30 / – 5 mm / 1 mm step]
Drum Reverse Rotation Interval
5-21 G147