Canon imagePRESS C1 Service Manual - page 740
Chapter 14
14-5
F-14-4
14.2.8 64-Gradation (TYPE=12)
0013-4608
imagePRESS C1 P / imagePRESS C1 / imagePRESS C1+ (Printer) / imagePRESS C1+
YMCBk64 gradation test print can mainly check gradation performance of each color (YMBCk) at one time.
F-14-5
14.2.9 Full Color 16-gradation (TYPE=14)
0013-4609
imagePRESS C1 P / imagePRESS C1 / imagePRESS C1+ (Printer) / imagePRESS C1+
Full color 16-gradation test print can mainly check gray balance, gradation performance of each color (YMCBk) and foggy image.
(1) Gray balance
Check to see if the output comes with even density of each color at gray scale area.
(2) Gradation performance
Check gradation performance and density difference of each color (YMCBk)
(3) Foggy image
If there is foggy image at the white area, it may be caused by fault of developing system or photosensitive drum, or correction fault of laser scanning system.