HP Color LaserJet CM4730 Service Manual - Page 158

Formatter system The formatter PCB is responsible for the following actions: ● Receiving and processing print data from the various MFP interfaces ● Monitoring control panel inputs and relaying MFP status information (through the product control panel and the bidirectional I/O) ● Developing and coordinating data placement and timing with the print engine ● Storing font information ● Communicating with the host computer through the bidirectional interface ● Controlling the Sleep mode The formatter monitors the MFP continuously through the video interface. When the MFP is ready to print, the formatter sends a signal to the DC controller, which turns the laser on or off based on the signal. Figure 4-3 Formatter system on page 138 shows the formatter system. The formatter also provides the electrical interface and mounting locations for an EIO card, two memory DIMMs, two additional flash memory cards (a third slot is reserved for firmware), hard disk, and optional analog fax accessory. Formatter DC controller PCB Laser/Scanner unit External devices (host computer, etc.) /TOP /BD VDO, /VDO SC VIDEO signals Bk laser driver VIDEO signals M laser driver VIDEO signals C laser driver VIDEO signals Y laser driver Figure 4-3 Formatter system Sleep mode This feature conserves power after the MFP has been idle for an adjustable length of time. Set the time length in the Administration menu, under Time/Scheduling, Sleep Delay. When the MFP is in Sleep mode, the product control panel backlight is turned off, but the MFP retains all printer settings, 138 Chapter 4 Theory of operation ENWW