Canon 7086 Series Service Manual - page 235
Chapter 6
6-3
6.2 Basic Sequence
6.2.1 Basic Sequence of Operations (laser exposure system)
0010-8010
iR7105 / iR7095 / iR7086
F-6-2
6.3 Various Controls
6.3.1 Controlling the Laser Activation Timing
6.3.1.1 Turning On and Off the Laser Unit
0011-2630
iR7105 / iR7095 / iR7086
The laser unit is turned on or off by the laser driver PCB 1 in response to the laser control signal (CTL0a/CTL1a/CTL2a/CTL0b/CTL1b/CTL2b) coming from the
DC controller PCB.
F-6-3
6.3.1.2 Flow of the BD Signal
0010-8012
iR7105 / iR7095 / iR7086
Control panel
power switch ON
Copy Start key ON
198
Image lead edge signal (PTOP)
Laser A, B, C, D
INTR
PSTBY
LSTR
STBY
Laser
BD signal (BD)
Laser scanner motor
Half-speed rotation
Wait activation
Imaging activation
for 1 scan
Wait activation
Half-speed
rotation
Detects laser A, C
Activation for potential control
When the surface temperature of the fixing
roller reaches 198 deg C, full-speed rotation.
(for potential control)
Image lead edge in page memory
Half-speed rotation
Laser driver PCB 2
J1301
CNT1a
CNT0a
CNT0b
CNT2a
CNT2b
CNT1b
J1311
Laser driver PCB 1
Video PCB
CNT1a
CNT0a
CNT0b
CNT2a
CNT2b
CNT1b
J1317
J1406