| 摘要 |
A method and apparatus for determining defective heating resistors in each of a plurality of inkjets in an inkjet printer, wherein each heating resistor is connected in parallel with a common capacitor, the method for each heating resistor includes 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, and inserting a known reference resistor in series with the heating resistor and 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 at the electrical junction between the heating resistor and the reference resistor, and using the digitized voltage to determine if the heating resistor is defective. |
