Canon LBP 2460 - B/W Laser Printer Service Manual page 54

CHAPTER 2
Laser/scanner unit
J1001-9
Laser diode
-8/-4/-2
Laser driver
J6-3
-2
BD PCB
-1
J1-5
-4
-3
Scanner
-2
motor
-1
J701-A1
-B1
-A2
-B2
-B3
-B4
-B5
-A6
High-voltage
-B6
power
-A7
supply PCB
-B7
-A8
-B8
-A9/B9
2 - 8
J202-1
-7 -3
-6 -4
-5 -5
-3 -7
-2/-6/-8
-1 -9
J206-1
-2
-3
J18-5 J207-1
-4 -2
-3 -3
-2 -4
-1 -5
J220-A1
-B1
-A2
-B2
-B3
-B4
-B5
-A6
-B6
-A7
-B7
-A8
-B8
-A9/B9
-A10/B10
Figure 2-2-5
DC controller PCB
The analog signal is output to adjust the
LLCONT
intensity of the laser beam.
The voltage in proportion to intensity of
PD
laser beam is input.
/LENBL
"L" to switch the laser on according to the
/LON
VDO signal.
VDO
"L" to forcibly switch the laser on.
Switches the laser on when the /LENBL
+5V
signal and this signal are "L".
/BDI BD input signal (pulse)
+5V
"L" when the scanner motor reaches the
/SCNRDY
prescribed speed.
/SCND
"L" to drive the scanner motor
SCNCLK
Scanner motor reference clock signal
+24VA
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
.