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Service Guide ML520/521
Chapter 2 Principles of Operation
LSI/Printhead Interface
The connection between the LSI and the printhead is made with the bi-directional serial data bus. The LSI
transmits the print data as serial data to the logic circuit of the printhead. The printhead returns serial data
from the printhead sensor analog circuit to the LSI. This information is used to determine the optimum
drive time for the next print request.
The logic circuit of the printhead signals the LSI if a parity error is detected in the print data.
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