Canon PC400 Service Manual page 265

Go over the following when this is noted.
1) Take out the cartridge from the copier, and rotate it several times.
2) Set the cartridge back into the copier, and make copies.
a. If the copies are normal,
• The user may use the cartridge for some time more; however, advise the user to
procure a replacement cartridge.
b. If the copies fail to return to normal,
• Replace the cartridge as described in "Replacing the Cartridge."
CHAPTER 3 IMAGE TROUBLESHOOTING
Figure 3-2A
3-3