IBM 4247-V03, Maintenance Information

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Table 23. Print quality tests and actions (fanfold) (continued)
Line Description Action, if failure
9 Printhead wire shifter test. Prints two lines.
To print in NLQ mode, one set of nine
wires (1B to 9B) is shifted up, by a
solenoid, relative to the fixed set of nine
wires (1A to 9A). In this test, the first line
prints a
less than symbol (NLQ mode),
tilde
(draft mode), and a
greater than
symbol (NLQ mode). The second line
prints a
less than symbol (draft mode), tilde
(NLQ mode), and a greater than symbol
(draft mode).
1. Install a new printhead. See Printhead.
2. Install a new logic board (see Logic
board).
3. Install new printhead cables.
10 Printhead drive test. Prints 19 lines. The
left margin should be even. See Printhead drive service check.
11 Print wire test. Look for light or missing
dots, or ink smearing. 1. Install a new printhead. See Printhead.
2. Install a new logic board (see Logic
board).
3. Install new printhead cables.
12 Continuous straight line. 1. See Main paper drive check and
adjustment.
2. See Printhead drive service check.
13 See Line 5 above.
14 Skew test in draft mode. The line should
print parallel to the edge of paper. See Main paper drive check and
adjustment.
Chapter 5. Removals, service checks and adjustments
172