Canon LBP-1120 Service Manual page 16

c. Notes on Handling of Cartridge
1) Before installing a new EP-22 cartridge in the printer, hold the cartridge at both sides as shown below, and gently
slop it at about 45 ° right-up and left-up 5 or 6 times to distribute toner evenly. Do not rock the cartridge in any
other way, as the toner may leak from the developing unit or cleaner unit.
Print the test pattern of 3 to 5 sheets to ensure that output images are not spoiled by a toner leak after installing the
cartridge in the printer.
2) If blank spots appear on the output image due to an uneven distribution of toner in the cartridge, shake the cartridge
to evenly distribute as shown in 1).
3) Do not place the cartridge on its end or upside down.
4) Do not open the protective shutter of the photosensitive drum and never touch the drum surface. Do not clean the
photosensitive drum.
5) Do not disassemble EP-22 cartridge.
6) Do not give vibration or shock to the cartridge.
7) Intensive light easily damages the photosensitive drum, causing blank spots or black stripes on the printed image.
Faulty print images can be corrected by stopping the printer momentarily. However, if the drum is exposed too
long, the blank spots and black stripes may remain even after stopping the printer. To prevent this, be sure to
always place the unsealed cartridges in their boxes or under a cover. Do not leave them uncovered after removing
from the printer.
Reference: If the cartridge are exposed to ordinary light for five minutes and then left in a dark area for
another five minutes, the print quality will return to a virtually permissible level. However, do not
expose the cartridge to direct sunlight.
Figure 1-5-2
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