Canon imageRUNNER ADVANCE C2020, Service Handbook

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CHAPTER 2 STANDARDS AND ADJUSTMENTS
2-18P
5.2 Points to Note When Mounting the LED Exposure Unit
• When mounting the LED exposure unit to the mounting pin on the machine, check to
make sure that the pin and the LED exposure unit are free of dust and foreign matter.
• Check to make sure that the LED exposure unit is secured fully to the bottom of the
mounting pin.
5.3 After Replacing the LED Exposure Unit
1) Replace the LED exposure unit, and assemble the machine to its initial state.
2) Connect the power plug, and turn on the main power switch.
3) Execute head shading in user mode.
5.4 Cleaning the LED Exposure Unit (if image faults, e.g., light
images, uneven images, occur as the result of dirt on the
lens surface)
1) Clean with a cleaning bar as follows:
■
Open the front cover, and pull the cleaning bar until it stops; then, push it back in. Re-
peat this four to five times.
2) If no improvement is noted, remove the LED exposure unit, and clean as follows:
■
If the dirt is on the LED exposure unit or the lens surface, dry wipe with lint-free paper.
If the dirt is excessive, moisten the lint-free paper with an appropriate amount of alco-
hol.