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3.
Move the carriage (160) to the center of the carriage rails and disconnect the
printhead cable connector (29) from the printhead (172).
4.
Load paper into the printer to prevent damage to the platen surface or printwires in
the event the printhead comes in contact with the platen.
5.
Support the printhead (172) while loosening two screws (173) securing the
printhead to the carriage (160).
6.
Remove the printhead (172) from carriage (160). Avoid snagging the drive cables
during removal.
7.
Remove two screws (174) and remove bracket (171).
8.
Replace in reverse order---critical adjustment for printhead to platen gap is
required. Refer to Section 4.5.34.
4.5.25: Lower Carriage Rail Removal and Replacement - Figure 4.12.
The carriage rails are one of the most critical components in the print. They are
manufactured to extremely tight specifications in dimensions, surface preparations and
finish, and in material characteristics.
The rails are hardened, precision ground, and hard chrome plated to provide a suitable
bearing surface for the sleeve bearings which ride on them. If the shaft surface becomes
dented, scratched or matted, it will drastically reduce the life of the carriage bearings.
Additionally, if the steel becomes exposed due to damage to the rail, corrosion could set in
which will also accelerate bearing wear.
If a rail becomes bent, print registration will be affected and most likely the platen to
printhead gap will be affected as well. The carriage rail should be immediately replaced to
prevent possible damage to the printhead or components.
1.
Remove top cover (see Paragraph 4.5.1).
2.
Remove printhead (see Paragraph 4.5.23).
3.
Remove two screws (168) securing detent (169) to left endplate.
4.
Remove Phillips screw (97) and loosen two set screws securing clamp (101) to
right end of carriage rail (124) and remove eccentric clamp. If necessary, use a
light mallet and a drift pin to tap the rail out of the clamp.
4-25
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