Ricoh D131 Service Manual page 365

No.
21 Auto Create Horizontal 2-dot Line (Sub Scan)
22 Auto Create 1-dot Independent Dots
23 Auto Create Grid 1-dot Line
24 Auto Create Vertical Stripes
25 Auto Create Horizontal Stripes
26 Auto Create Grayscale Horizontal (20 mm)
27 Auto Create Grayscale Horizontal (40 mm)
28 Auto Create Grayscale Vertical (20 mm)
29 Auto Create Grayscale Vertical (40 mm)
30 Auto Create Argyle
SM
Test Pattern
5-13
Test Pattern Printing
D131/D132/D133