Xylem CR500 CIRCULAR CHART RECORDERS - Manual (Page 15)

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Replacement of Pen “Ink Type”
Recorders that are equipped with fiber tipped cartridge pens are colored coded RED for
pen 1 and BLUE for pen 2.
The pen cartridge is securely fastened to the metal pen arm using a special "U" clip tab.
For ease of replacement, it is suggested that the two (2) screws that hold the pen arm be
loosened and the pen cartridge and metal pen arm be removed as an assembly. Refer to
Figure 2.10 (Page 17) for the location of the pen arm screws. Unsnap the plastic "U" clip
tab of the pen cartridge from the metal pen arm, remove and discard the old pen cartridge.
Replace the new cartridge by opening the hinge and snapping it securely around the metal
pen arm. Refer to Figure 2.8 for pen cartridge replacement.
Figure 2.8 Pen Replacement
Marking Systems - Thermal Type
This type of pen consists of a self-contained thermal print head that is attached to a metal
“Stylus” pen arm assembly.
Periodic maintenance is not required for this pen type. Since the thermal print head
creates its own chart, adjustment for outer ring are made automatically during each chart
change. Refer to Replacement of Thermal Stylus (page 15).
Replacement of Thermal Stylus
The thermal print head is securely fastened to the metal stylus arm, which is attached to
the pen motor drive assembly.
For ease of replacement, it is suggested that the stylus (with print head attached) be
removed as a complete assembly.
1. Disconnect AC power from unit.
2. Remove the two platen screws located on the front of the platen at the right center
of the platen.