pg. 63
[Caution] Be sure to insert the drum unit until it stops before closing the retaining cover. If the drum unit is
not pushed all the way when closing the retaining cover, error code E021-xx20 may occur.
6) Remove the dustproof glass cleaning tool [4] from the front cover.
7) Insert the dustproof glass cleaning tool [4] into the groove [a], and clean the Dustproof Glass.
[Caution] When pulling the dustproof glass cleaning tool out, be sure to pull it out while pushing the lever
toward right direction. If it is pulled out abruptly, it may come in contact with the ITB.
8) Attach all the removed parts in the reverse order from step 6) to Step 3).
Title
E020-0x60/E020-0x91/E020-0xb1 due to stained Toner Level Detection Area
Symptom
On the machines with serial number earlier than the following, E020-0360, E020-0391, E020-03b1 occurred
approximately from several days to 2 months after installation.
