Print Period
When the leading edge of the paper activates the input/registration sensor (PS1), the DC controller forces the laser diode ON until a BD signal is received. Next, the DC controller receives a VIDEO data stream (VDO) from the formatter. The DC controller translates the VDO data into a VIDEO OUT signal (VDOUT), which modulates the laser diode ON and OFF, creating intermittent bursts of laser light which reflect off the scanner mirror and onto the photosensitive drum to form a latent electrostatic image. VDO data is sent from the formatter for each scan line of print data on a page, and a BD signal must precede each VDOUT line data received by the DC controller.
When the paper exit sensor (PS3) is activated by the leading edge of the first page, the DC controller allows the Fusing Roller to warmup to 183° C. After the last VDO data is sent for the last line of print data on the first page, the formatter sends a PRNT signal for the second page.
About 1.87 seconds after the first VDO signal is sent from the formatter, the High Voltage PCA applies positive high voltage to the transfer roller.
When the DC controller identifies the last line of print data on the first page, the laser diode is forced ON and generates a sweep beam used to adjust the laser power. After the DC controller receives a BEAM DETECT signal (BD) initiated by the sweep beam, the laser power stabilizes and the sweep beam turns OFF. The DC controller then searches for a PRNT signal to begin the second page.
When the DC controller receives the next PRNT signal from the formatter, the DC controller anticipates receiving a BD signal and energizes the pickup roller clutch solenoid (PC