Patent ID: 6371590
Filing Date: 2002-04-16
Classification: B41J

Abstract:
A testing method of an inkjet printer for finding a defect in print head nozzles, wherein said inkjet printer comprises a head installation sensing circuit for providing a corresponding nozzle operating signal to at least one nozzle constituting the printer head, detecting via a voltage change whether or not the relevant nozzle is electrically operated, outputting a logic level of â€œ0â€  if there is a defect in the nozzle, and outputting a logic level of â€œ1â€  if there is not a defect in the nozzle, whereby indicating whether or not said printer head is installed, said testing method comprising:a first step of sequentially providing a nozzle operating signal to each of said nozzles of said printer head and operating said nozzles one by one; a second step of storing said logic level value output from said head installation sensing circuit into a buffer corresponding to said nozzle operating signal; a third step of determining whether or not the corresponding nozzle is defective when said level is output as â€œ0â€ , by checking a data bit value stored in said buffer in said second step; a fourth step of displaying an error message on a display device when the result of said third step indicates that at least one nozzle is defective; a fifth step of displaying the number of defective nozzles present in said printer head; and a sixth step of identifying and displaying which ones of said print head nozzles are malfunctioning when the result of said third step indicates that at least one nozzle is defective.