Canon LBP 2460 - B/W Laser Printer, Service Manual

Page: 54 / 314

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