Canon LBP 2460 Service Manual - Page 54

CHAPTER 2 Laser/scanner unit J1001-9 Laser diode Laser driver -7 -6 -5 -3 -8/-4/-2 -1 J6-3 -2 BD PCB -1 J1-5 -4 -3 Scanner -2 motor -1 DC controller PCB J202-1 -3 -4 -5 -7 -2/-6/-8 -9 LLCONT PD /LENBL /LON VDO +5V The analog signal is output to adjust the intensity of the laser beam. The voltage in proportion to intensity of laser beam is input. "L" to switch the laser on according to the VDO signal. "L" to forcibly switch the laser on. Switches the laser on when the /LENBL signal and this signal are "L". J206-1 -2 -3 /BDI +5V BD input signal (pulse) J18-5 -4 -3 -2 -1 J207-1 -2 -3 -4 /SCNRDY "L" when the scanner motor reaches the /SCND prescribed speed. SCNCLK "L" to drive the scanner mo. tor Scanner motor reference clock signal +24VA -5 High-voltage power supply PCB J701-A1 -B1 -A2 -B2 -B3 -B4 -B5 -A6 -B6 -A7 -B7 -A8 -B8 -A9/B9 J220-A1 -B1 -A2 -B2 -B3 -B4 -B5 -A6 -B6 -A7 -B7 -A8 -B8 -A9/B9 HVTS Transfer bias monitor signal HVTVLTD Transfer bias drive signal /HVTRVSD Transfer negative bias drive signal /HVTCRTD Transfer bias constant current drive signal /HRLBD Fixing roller bias drive signal /DCHGBD Discharge bias drive signal /HV1FRQ Primary bias frequency output signal DENADJ Image density adjustment signal /DCHGUP Discharge bias switch signal /DBACD Developing AC bias drive signal /HV1DCD Primary DC bias drive signal /DBFRQ Developing bias frequency output signal /DBDCD Developing DC bias drive signal +24VB -A10/B10 2 - 8 Figure 2-2-5