Printronix P9012, Maintenance Manual

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2–2 Principles of Operation
Scope
This chapter presents the principles of operation for the P9012 printer. This
information is intended to provide the technician with a basic understanding
of printer functional operation.
This chapter also provides illustrations which show the location of test points
on the P9012 PCBAs.
For a complete list of signal mnemonics mentioned in this chapter, refer to
Appendix C.
Purpose
The P9012 printer is a computer output device. It receives data from a host
computer and provides hard copy text or graphics. The hard copy is
composed of an array of dots. In the case of text, these dots are arranged in a
matrix to produce characters.