Printronix 108525-001, Maintenance Manual

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2-68 P6040/P6080 Principles of Operation
Section III. Operation
2-14. Normal Operation (Figure 2-35)
a. Character Printing
During one cycle of normal operation, the printer is setup and put online by the operator, using the
control panel. Host computer data is then read into the data input buffer. ASCII data from the
input buffer is compared to tables stored in memory to determine the matrix locations to be
printed for each character and build the dot image buffer. Information from the dot image buffer is
synchronized with printer requirements using magnetic pickup signal then shifted out to hammer
drivers. The selected hammers are fired. When all dots in a row are printed, the paper is shifted
one dot row and the next line of data from the dot image buffer is synchronized then shifted out to
the hammer driver. Shifting of paper is delayed to allow double printing when bold or enhanced
print is required.
b. Self Test
During self test, data from memory is used to build the dot image buffer. Operation then proceeds
as in normal printing.
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