IBM V03, Maintenance Information

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Table 23. Print quality tests and actions (fanfold) (continued)
Line Description Action, if failure
3 Logic and microcode data.
4 Printhead wire test.
The 18-wire printhead print wires are
numbered 01A - 09A and 01B - 09B (see
Table 24).
The wire numbers are printed under each
group. Look for light or missing dots. The
18-wire printhead xxB line segments (see
Table 24) should be slightly lower than the
xxA line segments.
Print the T&D14 fanfold print test after
completing each of the following steps:
1. Check the printhead cable connections.
Repair as needed.
2. Install a new printhead. See Printhead.
3. Install a new logic board (seeLogic
board).
4. Install new printhead cable.
5. Run T&D in automatic mode to verify
correct printer operation (see “Running
the test and diagnostic (T&D)
programs” on page 101).
5 Paper feed test. Prints three lines of
alternating line segments and spaces. The
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. See Main paper drive check and
adjustment.
6 Bidirectional printing test. Prints four lines.
Each H should align with the H above or
below. 1. See Bidirectional Printing.
2. See Printhead drive service check.
7 Bidirectional printing test. Prints four lines.
Each vertical line should align with the
vertical line above or below. 1. See Bidirectional Printing.
2. See Printhead drive service check.
8 The first line is 10 CPI draft mode, the
second line is 17.1 CPI draft mode, and
the third line is 10 CPI NLQ mode. See Printhead drive service check.
Chapter 5. Removals, service checks and adjustments
171