Formatter-control system
The formatter is responsible for the following procedures:
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Controlling sleep mode
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Receiving and processing print data from the various product interfaces
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Monitoring control-panel functions and relaying product-status information (through the control panel
and the network or bidirectional interface)
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Developing and coordinating data placement and timing with the DC controller PCA
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Storing font information
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Communicating with the host computer through the network or the bidirectional interface
The formatter receives a print job from the network or bidirectional interface and separates it into image
information and instructions that control the printing process. The DC controller PCA synchronizes the image-
formation system with the paper-input and -output systems, and then signals the formatter to send the
print-image data.
Sleep mode
NOTE: This product uses an Auto-Off feature for sleep mode.
After a user-specified time, the Auto-Off feature automatically conserves electricity by substantially
reducing power consumption when the product is not printing. After a user-specified time, the product
automatically reduces its power consumption (Auto-Off). The product returns to the ready state when a
button is pressed, a print job is received, or a door is opened. When the product is in Auto-Off mode, all of the
control-panel LEDs and the power button backlight LED are off.
NOTE: Although the product lights are off in Auto-Off mode, the product functions normally when it
receives a print job.
Input/output
The product receives print data primarily from the following:
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Hi-Speed USB 2.0 port
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802.11b/g/n wireless networking (wireless models only)
CPU
The formatter incorporates a 750 MHz ARM processor.
Memory
The random access memory (RAM) on the formatter PCA contains the page, I/O buffers, and the font storage
area. RAM stores printing and font information received from the host system, and can also serve to
temporarily store a full page of print-image data before the data is sent to the print engine.
Firmware
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HP LaserJet Pro MFP M225/M226 Printer series
4 Chapter 1 Theory of operation ENWW
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