Tektronix 1235N - Phaser Color Laser Printer Service Manual page 228

Interpreting the Step Test Patterns
The Step Test Patterns consist of 11 color
Cyan Step Test Pattern
bars, starting with a100% fill of a primary
color bar and progressing in 10% steps to a
0% (white) fill bar. Use these pages to
Magenta Step Test Pattern
isolate primary color imaging or LED head
problems.
Look for uniform transitions from dark to
light.
Yellow Step Test Pattern
Black Step Test Pattern
0728-21
214
Phaser 1235 Network Color Printer