IBM 4230 User Guide - Page 96

4. When you release the key, the printer automatically saves the current value. Note: The 's indicate the position of the print head relative to the limits. As long as you press Darker or Lighter, the printer displays an increasing amount of darkness or lightness until one of the limits of the gap is reached. The printer displays either LIGHT | | DARK DARKNESS LIMIT REACHED or LIGHT DARK LIGHTNESS LIMIT REACHED As you adjust the gap, you may also see the printer display LIGHT | ---------| DARK DEFAULT DARKNESS This message tells you that the forms thickness setting is at the automatically set value. See "Understanding the Operator Panel" in IBM 4230 Printer Models 101, 1S2, 201, 2S2, 4S3, and 5S3 Operator Panel Instructions for more information on this setting. 1-74 User's Guide