IBM 4247 Maintenance Information page 339

Table 49. Print Quality Tests and Actions (Fanfold)
Line Description
1 Skew test in draft mode. The line should
print parallel to the edge of paper.
2 Skew test in NLQ mode. The line should
print parallel to the leading edge of paper.
3 Logic and microcode data.
4 Printhead wire test.
The 18-wire printhead (Models A00, 001,
and 003) print wires are numbered 01A -
09A and 01B - 09B (see Figure 93 on
page 342). The 9-wire printhead (Model
002) print wires are numbered 01 - 09 (see
Figure 94 on page 343).
The wire numbers are printed under each
group. Look for light or missing dots. The
18-wire printhead xxB line segments (see
Figure 93 on page 342) should be slightly
lower than the xxA line segments.
Action, if failure
See "Main Paper Drive Check and
Adjustment" on page 301. The upper right
corner may be catching in printhead mask.
See "Main Paper Drive Check and
Adjustment" on page 301.
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" on page 356.
3. Install a new logic board. For Model
A00, see "Logic Board - Model A00" on
page 370. For Models 001 and 002,
see "Logic Board - Models 001 and
002" on page 378. Or "Logic Board -
Model 003" on page 366.
4. Install new printhead cable.
5. Run T&D in automatic mode to verify
correct printer operation. For Model
A00, see "How To Run the Test and
Diagnostic (T&D) Programs" on
page 161. For Models 001, 002, and
003, see "How To Run the Test and
Diagnostic (T&D) Programs" on
page 201.
Chapter 5. Removals and Adjustments
339