Lexmark Optra C Service Manual - Page 120
Test Pattern Selection, OFF, the COLOR SELECT LEDs go OFF and only the Density
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5045-001 When the printer is turned ON, or the density adjustment panel is not operated for at least 30 seconds, it enters the OFF state. When OFF, the COLOR SELECT LEDs go OFF and only the Density gauge DEFAULT LED (middle) lights if all the colors are set at the factory-shipping value, or otherwise all LEDs will go OFF. If only the + and - keys are pressed for at least 5 seconds, all color densities are initialized to DEFAULT and the panel enters the OFF state. If the individual color densities are changed from the default position, these values will Not be lost when the printer is turned off. They must be manually set back to the default value. Test Pattern Selection 1. Press the ENTER key 8 times while holding down the COLOR SELECT key. All COLOR SELECT LEDs flash to indicate the shift to the test print pattern setting mode: 3-15