Figure 4-18 Print cartridge (placeholder for 2–4–8)
Memory tag
A memory tag is a nonvolatile memory that is built into the print cartridge. The DC controller reads and
writes data that is stored in the memory tag.
The DC controller reads data at the following times:
●
When the power is turned on
●
When someone closes the front cover
●
When it receives a command from the formatter
The DC controller writes information at the following times:
●
At a specified interval during printing
●
When it receives a command from the formatter
When the read/write operation fails or the wrong data is read or written, the DC controller determines
that an error has occurred and notifies the formatter of a cartridge-memory abnormality. Printing then
stops.
The cartridge sensor (SR9) detects the presence of a cartridge. The high-voltage power-supply PCA
also detects cartridge presence, and can detect the presence when the cartridge door is open and the
power supply is interrupted. This ability enables procedures to appear on the control-panel display when
a user is required to remove paper jams with the cartridge door open.
120 Chapter 4 Theory of operation ENWW
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