HP 4300 Service Manual - Page 146

Print cartridge memory chip The print cartridge memory chip is a non-volatile memory device built into the print cartridge. It stores information about the cartridge. The DC controller PCA reads and writes memory data to the memory chip to monitor the print cartridge usage and condition. The DC controller PCA reads and writes to the memory chip at specific times. If the read-write process fails four times in a row, the DC controller PCA detects a print cartridge memory failure and a 10.00.00 SUPPLIES MEMORY ERROR error message appears on the control-panel display (see "Numerical printer messages" on page 274). DC Controller PCA Memory chip controller circuit Print cartridge Figure 57. Memory chip contact Memory chip Print cartridge memory chip 126 Theory of operation Q2431-90912