2.1.04 Print Control
The print data is transmitted as serial data from the LSI to the control circuit and the driver
contained in the printhead.
After the data is printed, the sensor analog circuit controlling each pin returns the pin stroke data
to the MPU. The MPU will make an automatic head gap adjustment. This feedback system sets
the optimum drive time for each pin in order to maintain high print quality.
In the case of envelopes, where the medium thickness varies as the printhead moves along the
platen, the strike force of the pins changes to compensate for the differences in thickness.
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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Principles of Operation 2 - 8 Microline 520/521 Service Handbook
P/N 59257803
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