Canon NP6621 Service Handbook page 123

No.
511 Universal cassette paper size
storage (cassette 4)
512 Universal cassette paper size
storage (cassette 5)
513 Book frame erase width
Item
Table 7-714-2
Description
settings: 0 to 14
default: 0
settings: 0 to 14
default: 0
settings: 0 to 20
default: 20
SERVICE MODE
7–15