Canon LBP 2460 - B/W Laser Printer Service Manual page 34

CHAPTER 1
Note: If light (1500 lux) is exposed to the drum for 5 minutes, and it is left in a dark area for 5
minutes, it will recover to a normal state and will be no effect on prints. However be sure
to not expose it to direct sunlight. The strength of sunrays are about 10000 lux to 30000
lux.
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Figure 1-5-8