Lexmark Optra C Service Manual - Page 125
OFF, the COLOR SELECT LEDs go OFF, and only the Density, Diagnostic Aids 3-20
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5045-001 3. Decide on an adjustment value by using + key or - key. When the adjustment value differs from that currently set in the printer, the Density gauge LED flashes. The relationship between each adjustment item and value is as follows. a. For leading edge registration adjustment. The adjustment value changes by 0.3 mm each time the LED is switched by pressing of the + key or - key. b. For cassette or manual feeding tray edge registration adjustment. The adjustment value changes by 0.425 mm each time the LED is switched by pressing of the + key or - key. 4. Determine the adjustment value by the ENTER key. The Density gauge LED flashes and the printer adjustment value changes. 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 adjustment values are at the ROM default value, or otherwise all go OFF. Press only the + and - keys for at least 5 seconds to initialize all adjustment values as DEFAULT and the panel enters the OFF state. Diagnostic Aids 3-20