HP LaserJet 4250 Service Manual - Page 175
Formatter system, PowerSave (LJ 4200/4200L/4300) or Sleep (LJ 4250/4350) Mode, POWERSAVE=ON, SLEEP=ON
View all HP LaserJet 4250 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 175 highlights
Formatter system The formatter is involved in the following procedures: ■ Controlling the PowerSave/Sleep mode ■ Receiving and processing print data from the various printer I/Os ■ Monitoring control-panel functions and relaying printer-status information (through the control panel and the bidirectional I/O) ■ Developing and coordinating data placement and timing with the dc controller PCA ■ Storing font information ■ Communicating with the host computer through the bidirectional interface The formatter receives a print job from the 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. The formatter also provides the electrical interface and mounting locations for two EIO cards, additional memory DIMMs, the hard-disk accessory, and the optional HP Fast Infrared Receiver. PowerSave (LJ 4200/4200L/4300) or Sleep (LJ 4250/4350) Mode This feature on the configuration menu conserves power after the printer has been idle for a specific period of time. When the printer is in PowerSave or Sleep mode, the control-panel backlight is turned off, but the printer retains all printer settings, downloaded fonts, and macros. The default setting is POWERSAVE=ON, or SLEEP=ON, with a 30-minute idle time. PowerSave/Sleep can also be turned off from the resets menu on the control panel. The printer exits PowerSave or Sleep mode and enters the warm-up cycle when any of the following occurs: ■ A print job, valid data, or a PML or PJL command is received at the parallel port, serial port, or EIO card. ■ A control panel key is pressed. ■ The top cover is opened. ■ A tray is opened. ■ The engine-test button is pressed. NOTE Printer error messages override the PowerSave or Sleep message. The printer enters PowerSave or Sleep mode at the appropriate time, but the error message continues to appear. Formatter system 161