Riso SF Series User Manual page 176

174
Chapter 11 Troubleshooting
Problem
The edges of printed papers
are smudged with ink.
The back of the printed
paper is smudged with ink.
Point to check
Check if the size of the paper
that was placed on the paper
feed tray for master making
is larger than the size of the
original.
Check if the feed-tray paper
guides are fitted to the width
of the paper during master
making.
Check if [Max. Scan] is set to
on.
Check if a corner of a thick
paper, such as a postcard,
scratches the master when it
is being printed.
Check if a considerable time
elapsed for the master roll
that was used after the previ-
ous master making.
Check if the pressure roller
is smudged with ink.
Check if the feed-tray paper
guides are fitted to the width
of the paper during master
making.
Check if a paper that does
not efficiently absorb ink is
used.
Action
Set the same size of paper on the paper feed tray as
the original, and then perform the master making
process.
The size of the master to be made is determined
according to the size of the paper (the width of the
feed-tray paper guides and the length of the paper)
that is placed on the paper feed tray.
If the size of the paper placed on the paper feed tray
for master making is larger than the size of the origi-
nal, the outside of the original is also included in
master making.
For this reason, if the platen cover is not securely
closed, the edges of the original may be processed
as shadows.
If [Max. Scan] (A 60) is set to on, a master is made
in the maximum printing area of the print drum (cylin-
der), regardless of the size of the original or paper.
For this reason, if the platen cover is not securely
closed, the edges of the original may be processed
as shadows.
Perform master making again.
Use papers that are suitable for this machine.
(A 15 "Printing papers")
Perform master making again.
Remove the print drum (cylinder), and then wipe the
pressure roller with a soft cloth, etc.
(A 156 "Maintenance")
If the print position deviates from the paper, this may
cause the pressure roller to be stained with ink.
Adjust the print position within the size of the paper.
When performing master making, align the feed-tray
paper guides with the width of the paper.
(A 32 "Setting up the paper feed tray and the
paper")
If the feed-tray paper guides are not aligned with the
width of the paper, a master is made in a wider area
than the paper size. As a result, ink adheres to the
pressure roller outside the paper, and this may cause
the ink to be printed on papers.
As the next paper is fed before the ink dries, ink
adheres to the back of papers.
Take the following measures.
• Use papers that efficiently absorb ink.
• Reduce the print speed.
[Interval] (A 81)
[SPEED] (A 78)
• Decrease the ink density.
[DENSITY] (A 79)
[Contrast] (A 54)
[Ink Saving] (A 56)