IBM 4247-003 Maintenance Manual - Page 340

Table 49. Print Quality Tests and Actions (Fanfold) (continued) Line Description Action, if failure 5 Paper feed test. Prints three lines of See "Main Paper Drive Check and alternating line segments and spaces. The Adjustment" on page 301. top and bottom lines are printed first. The middle line is printed after line 12 prints and the paper feeds back to line 5. The middle line should be centered between the first and third lines. 6 Bidirectional printing test. Prints four lines. 1. See "Bidirectional Printing" on Each H should align with the H above or page 294. below. 2. See "Printhead Drive Service Check" on page 333. 7 Bidirectional printing test. Prints four lines. 1. See "Bidirectional Printing" on Each vertical line should align with the page 294. vertical line above or below. 2. See "Printhead Drive Service Check" on page 333. 8 The first line is 10 CPI draft mode, the See "Printhead Drive Service Check" on second line is 17.1 CPI draft mode, and page 333. the third line is 10 CPI NLQ mode. 9 Printhead wire shifter test (18-wire 1. Install a new printhead. See printhead only, Models A00, 001, and 003). "Printhead" on page 356. Prints two lines. To print in NLQ mode, one 2. Install a new logic board. set of nine wires (1B to 9B) is shifted up, For Model A00, see page "Logic Board by a solenoid, relative to the fixed set of - Model A00" on page 370. For Models nine wires (1A to 9A). In this test, the first 001 and 002, see page "Logic Board - line prints a less than symbol (NLQ mode), Models 001 and 002" on page 378. Or tilde (draft mode), and a greater than "Logic Board - Model 003" on page symbol (NLQ mode). The second line 366. prints a less than symbol (draft mode), tilde 3. Install new printhead cables. (NLQ mode), and a greater than symbol (draft mode). Chapter 5. Removals and Adjustments 340