- A straight dark line down the length of the page
- An intermittent straight blank line across the width of the page
- A straight dark line across the width of the page
- A consistent straight blank line across the width of the page
The correct answer is 1.
Because dot-matrix printers are line printers and not page printers, there is no opportunity for them to exhibit a printing problem that manifests itself as a uniform defect down the length of the page. Non print-related, full-page concerns can, however, be caused by a paper-feed problem, for instance. The other problems are line-based issues that can be caused by pins stuck in or out by printhead cable flaws.
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