the module. Do not confuse bend and flex; the shaft will flex back and forth when un-
supported by the bearings (e.g., when removed from the printer); a bend in this case
is describing a shaft that has been damaged with a permanent angle or deflection in
it. The shaft will always flex but will retain its true straight position.
- The rollers themselves cannot have any grit material missing that would cause
a flat spot on the roller.
- The rollers should be seated in the bracket/bearings such that they’re not rub-
bing.
- The plastic, U-shaped grit roll bearings, which provide support to the assembly
at alternate rollers, are more susceptible to wear than the shaft itself. In problem
cases where the grit roll is suspected, changing only the bearings first may be
more worthwhile (and less expensive, easier to ship...). The points where the
bearings support the shaft can be lubricated by the application of a small quantity
of grease, ColorSpan P/N 090854.
- The media drive gear, mounted on the hub of the grit roll shaft, is a precision-
machined piece. If the gear is not within tolerance and specifications, runout
banding will occur.
- The drive gear is secured to the shaft hub by four screws. A “grit washer” must
go between the gear and the hub.
- Take care not to damage the gear when performing service of any kind.
Pinch rollers - The alignment of the rollers is crucial for stable and consistent media
feed with proper nip tension. If any roller is not to spec you will likely experience feed
problems: skewing, buckling, cockling, etc. Correct alignment is top-dead-center of
grit roller. The 5400 pinch rollers are self-aligning when installed correctly.
- The rollers cannot have flat spots. If multiple rollers do have flat spots, turn each
roller so that the flat areas are not aligned. This will prevent immediate problems,
and over time the rollers will reround themselves.
- Over time, media particles will build up on the rollers. Clean with water until no
residue is apparent.
Media Spool
- The media spool should sit in its holders evenly, not at an angle.
- The media on the spool must be fed into the nip evenly and straight.
- The collet must fit securely into the media’s cardboard core. Both left and right
collets should be tightened to grip the core.
- If the media core is notched, be certain that the spines of the collet do not fall
into the core notches.
Rigid Media Support Tables - One of the keys to successful output on rigid media is
the condition of the tables and the attached fences
- The tables must be made coplanar to the platen and each other. See
Knowledgebase article 10027, Table Setup, for a detailed description
- Use a 24" or larger framing square to square the output fence to the pinch roll-
5400 Technical Training Manual
MacDermid ColorSpan Confidential
Page 20 of 39
MacDermid, Inc. 11311 K-Tel Drive, Minnetonka, MN 55343
Phone: 952-944-9457 Fax: 952-944-8507