HP 2500 Service Manual - Page 85
Imaging-drum E-label, Print-cartridge E-label
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Imaging-drum E-label The E-label is nonvolatile memory, which is built into the imaging drum and stores usage information. When the imaging drum is installed in the printer, the E-label makes constant contact with the E-label reader. The E-label reader sends memory information to the dc controller, which updates the information and sends it back to the E-label. The dc controller instructs the E-label to read information when: the printer is turned on the top cover is closed a command is sent from the video controller The dc controller instructs the E-label to write information when: a specified period occurs during printing a command is sent from the video controller If the E-label reader fails to read or write information four times in a row, the dc controller notifies the video controller that an abnormality exists in the imaging drum. Figure 38. Print-cartridge E-label EN 4 Theory of operation 83