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Chapter 5 What to Do If
5-5 Media Wrinkles or Shrinks, or Feed Is Unstable
A variety of problems can occur if the media feed is not
smooth. This can cause such problems as poor printing quality,
contact with the media by the print heads, misaligned posi-
tioning, media jams, or poor take-up. Take action as follows.
Media Wrinkles or Shrinks
Is the media loaded and set up straight and securely?
Feed is not smooth when the media is not straight or
tensioned unevenly on the left and right. Reload the
media.
Are the feed dancer rollers level?
If they are not level, the media may become crooked or
wrinkle. Adjust the position of the balance weights to
match the width of the media.
Is media loaded correctly?
Make sure the media is passed through the guide roller
and dancer rollers correctly.
Are the media clamps mounted?
Be sure to attach the media clamps.
Was loaded media allowed to stand for some time?
Media may shrink or wrinkle if it is heated for an ex-
tended time. When printing ends, switch off the sub
power or remove the media.
Was the media loaded while the heating devices were
hot?
Loading media after the heating devices have warmed
up causes the temperature of the media to rise suddenly,
which may cause the media to shrink or wrinkle during
printing. Before loading media, switch off the sub power
and allow them to cool.
Is the temperature of the heating devices too high?
Set the temperature to suitable values for the type of
media.
☞ p 40 "Settings of Preheater, Print Heater and Dryer"
Is the roll media sagging?
Sagging of the roll can cause wrinkling or warping. At-
tach the reinforcement pipe when loading the media.
Also, when storing media, place it so that it will not sag
under its own weight.
The Media Is Not Straight
Is the media loaded and set up straight and securely?
Feed is not smooth when the media is not straight or
tensioned unevenly on the left and right. Reload the
media.
Are the feed dancer rollers level?
If they are not level, the media may become crooked or
wrinkle. Adjust the position of the balance weights to
match the width of the media.
Is media loaded correctly?
Make sure the media is passed through the guide roller
and dancer rollers correctly.
Media Feed Is Not Smooth
Do the media or the dancer rollers strike some other
object?
Make sure the media and the dancer rollers do not touch
anything else. This may affect printing, even when feed
appears to be smooth.
Is the media too thick?
Media that is too thick may not only cause unstable feed,
but may scrape the print heads, resulting in malfunc-
tion. Never use such media.
Are the grit rollers dirty?
Check to make sure the grit rollers are free of buildup of
foreign material such as media scraps.