IBM 4230 User Guide - Page 172

Automatic Forms Thickness Adjustment (AFTA) The Automatic Forms Thickness Adjustment (AFTA) mechanism performs the following tasks: Automatically measures the forms thickness and adjusts the gap from the print head to the platen rod based on the measured value. Measures the form thickness whenever printing is to occur. When you replace the paper, the thickness is automatically remeasured. For the Document Insertion Device (F3), AFTA measures the first document after you turn the printer On (|) or after you press Stop and then Start. For the Auto Sheet Feeder Device (F4), AFTA measures the first sheet of each bin after you turn the printer On (|) and after you press Stop and then Start. The operator may adjust the AFTA by pressing Darker and Lighter. Locate the information on your forms device and follow the procedure for adjusting the print darkness in Chapter 1, "Setting Up the 4230 Printer." Platen Rod The platen rod is a metal bar with a flat surface. The platen rod is part of the base printer and is easy to identify when no forms device is installed. You need to know the location of the platen rod for installing the forms device, loading forms, and aligning the first print line. Platen Rod 3-8 User's Guide