IBM 6400-I15 Maintenance Manual - Page 177

8. The display will show "SERVICE / PRINTER MECHANISM TESTS", the first menu item. Press Enter to enter the mechanism tests menu. 9. Press Scroll" or Scroll# until "PRINTER MECHANISM TESTS / END OF FORMS ADJUST" is on the display. This test will print a vertical "comb" pattern at around column 70, each long bar separated by three shorter bars. An enlarged example of the comb pattern is shown below. Short Bar Long Bar 10. Press Enter until the END OF FORMS ADJUST test starts. The comb pattern will print until the display shows "001 END OF FORMS / LOAD FORMS" and (if enabled) the audible alarm sounds. If the alarm sounds, press Stop to silence it. 11. Remove the paper from the tractors and examine the area of the page perforation. (If the alarm sounds when you open the platen, press Stop to silence it.) If a bar from the comb pattern just meets the perforation, the end of forms adjustment distance is correct. (A bar exactly on perforation is ideal; 1 or 2 dot rows off is OK; 5 to 7 dot rows off is too much.) Unless you wish to restart the procedure with 6-part paper, you may stop the test here, and skip to step 22. (See the note at the beginning of this procedure.) If the comb pattern stopped short of the perforation or printed beyond the perforation, go to step 12. 12. Measure how short or long the comb pattern printed by counting the number of dot rows needed to reach the perforation, or the number of dot rows that printed beyond the perforation. NOTE: You can use the long bars to count the dot rows quickly. There are three dot rows between each long bar, so each long bar increases the number of dot rows by four. You can also tear off a small piece of the comb pattern from the beginning of the pattern and use it as a ruler to help you measure the dot rows required either to reach the perforation or back up to it. Adjustment Procedures 177