Canon VarioPrint MICR i Series, Operation Manual

Page: 498 / 576

Many sheets arrive in the sentry tray (sentry rejects)
What are sentry rejects
Sentry rejects are the delivery of sheets in the sentry tray. The printer detects that one or more
sheets have deformations that may cause damage to the print engine. Sentry rejects cause loss of
media, ink and production time (runnability).
The sentry measures deformations and calculates if the deformation height is larger than the
current print gap. Based on this calculation, a sheet is ejected into the sentry tray or not.
The printer automatically corrects the order and contents of the document pages when sheets are
removed due to sentry rejects.
First pass and second pass sentry rejects
Sentry rejects can occur when sheets pass for the first time (
first pass
) or for the second time
(
second pass
) through the sentry.
• When media sheets already have deformations before they enter the sentry, these sheets are
rejected during the
first pass
.
Media sheets can have curl (1), bulges or wavy edges (2) or can be damaged in another way
(3).
1 2 3
[549] Media deformations
First pass sentry rejects may be caused by incorrect media storage or media handling. You
recognize first pass sentry rejects by ejected sheets that have not been printed.
[550] First pass sentry rejects
• The drying process of the one-sided printed sheets can also cause deformations. Then, the
sentry rejects these sheets during the second pass .
You recognize second pass sentry rejects by ejected sheets that have been printed on the front
side or that arrive quickly after each other. Most of these sheets are not ejected because of a
deformation, but because the printer is restoring the page sequence.
It depends on the media surface, the ink amounts and the location of the inks on the sheet if
sheets deform after the first printing process.
Many sheets arrive in the sentry tray (sentry rejects)
498 Chapter 14 - Problem Solving
VarioPrint i-series MICR