Determining defective resistors in inkjet printers

Details Determining defective resistors in inkjet printers Determining defective resistors in inkjet printers

2006-09-29

2008-11-11

Nguyen, Lamson D (Department: 2861)

Incremental printing of symbolic information

Ink jet

Controller

Reexamination Certificate

active

07448718

ABSTRACT:
A method and apparatus for determining defective heating resistors Riin each of a plurality of inkjets in an inkjet printer, wherein each heating resistor Riis connected in parallel with a common capacitor, the method for each heating resistor Riincludes providing a variable power supply effective in a first condition to produce a first operating DC voltage and, in a second condition, to produce a second known test DC voltage Vt, and inserting a known reference resistor Rrin series with the heating resistor Riand capacitor and also open circuiting the capacitor in response to sensing that the power supply has changed from the first condition to the second condition. The method and apparatus further include digitizing the voltage Viat the electrical junction between the heating resistor Riand the reference resistor Rr, and using the digitized voltage to determine if the heating resistor Riis defective.

REFERENCES:
patent: 3414811 (1968-12-01), Carter
patent: 6199969 (2001-03-01), Haflinger et al.
patent: 6963196 (2005-11-01), Mende
patent: 2002/0109414 (2002-08-01), Noboru

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