Laser Exposure System; Points To Note When Replacing The Laser Unit; When Replacing The Laser Unit; Checking The Laser Power - Canon ImageRunner iR8500 Series Service Manual

Chapter 14

14.4 Laser Exposure System

14.4.1 Points to Note When Replacing the Laser
Unit
iR105i/iR105+ / iR9070
1) Check to make sure that the Execute/Memory lamp in the control
panel is OFF; then, turn off the main power switch.
2) Disconnect the power plug from the power outlet.
The machine remains powered as long as the power plug is connected to
the power outlet. Be sure to disconnect it.
3) Replace the laser unit.
4) Record the values (LA-DELAY) indicated on the label attached to the
new laser unit.
5) Assemble the machine, and connect the power plug to the power
outlet; then, turn on the main power switch.
6) Enter the values recorded in step 4) using service mode: COPIER>
ADJUST> LASER> LA-DELAY.

14.4.2 When Replacing the Laser Unit

/ iR85+ / iR8070
1) Check to make sure that the Execute/Memory indicator in the control
panel is OFF, and turn off the main power switch.
2) Disconnect the power plug from the power outlet.
The machine remains supplied with power as long as the power plug
remains connected to the power outlet. Be sure to disconnect the power
plug.
3) Replace the laser unit.
4) Take notes of the settings (LA-DELAY) on the label attached to the
new laser unit.
5) After assembling the machine, connect the power plug to the power
outlet, and turn on the main power switch and the control panel
power switch.
6) Enter the settings recorded in step 4) in service mode:
COPIER>ADJUST>LASER>LA-DELAY.

14.4.3 Checking the Laser Power

iR105i/iR105+ / iR9070
1) Check to make sure that the Data lamp in the control panel is OFF,
and turn off the main power switch.
2) Disconnect the power plug from the power outlet.
3) Remove the copyboard glass.
4) Open the laser power checker slot cover [1].
14-28
0008-4300
5) Shift the switch of the laser power checker (FY9-4008) to '2'.
6) White orienting the laser power checker so that its light-receiving
face [1] is as shown, fit it in.
0008-8468
7) Connect the probe lines of the laser power checker to a digital
multimeter.
0007-0662
[1]
F-14-56
[1]
F-14-57
F-14-58