IBM 6500-V05 Maintenance Manual - Page 218

Selecting And Running Tests The CE Tests shown in Figure 7 are summarized below: Printer Mechanism Tests • Burn In Test Use of this test is not recommended. This test is used by the manufacturer to burn in the printer before it is shipped to the customer and has no value as a maintenance tool. • Plot Test Prints all dot positions, creating a solid black band. Exercises the shuttle and hammer bank at maximum capacity. Power Supply board Hammer bank cover Hammer springs Hammer coils (the shuttle frame assembly) • Shuttle Only This test runs only the shuttle. • Shuttle Slow Verifies proper operation by exercising the shuttle and ribbon mechanisms at low speed. You can also use this test to check ribbon tracking and reversing. • Shuttle Fast Verifies proper operation by exercising the shuttle and ribbon mechanisms at high speed. You can also use this test to check ribbon tracking and reversing. • Hammer Phasing A hammer timing parameter that permits you to adjust the vertical alignment of dots in character printing. • End of Forms Adjust A vertical comb pattern used to determine the number of dot rows from the completion of a paper out fault to the end of the paper. Hammer Phase Value The hammer phase value is a timing parameter that permits you to adjust the vertical alignment of dots in character printing. The numerical units are relative; they do not represent a physical measurement or value. There is no "correct" value or range. The factory prints the initial phase value on the aluminum casting of the shuttle assembly, next to the motor housing. Use this value as your starting point when adjusting hammer phasing. End of Forms Adjustment Value This parameter determines where on the paper the printer will stop printing when an out of paper fault is detected. The unit of measurement is dot rows. The number of dot rows may be adjusted up or down 1/2 inch from the factory default of 40 dots. 218