Ricoh G188 Service Manual page 735

5 Grid Vertical Line
6 Grid Horizontal Line
7 Grid Pattern Small
8 Grid Pattern Large
9 Argyle Pattern Small
10 Argyle Pattern Large
SM Appendix
17 Band (Horizontal)
18 Band (Vertical)
19 Checker Flag Pattern
20 Grayscale (Vertical Margin)
21 Grayscale (Horizontal Margin)
23 Full Dot Pattern
8-323
Engine Service Mode
G188/G189