Xylem CR500 CIRCULAR CHART RECORDERS - Manual (Page 16)

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3. Follow the thermal pen leads to the main “mother” board located on the back of
the recorder platen.
4. Remove the “plug in” thermal print head leads from the main “mother” board.
5. Remove the pen arm screws that attach the pen arm stylus to the pen arm motor
assembly located on the front of the platen.
6. Remove the pen arm assembly.
7. Install new pen arm assembly in the reverse order of disassembly.
8. Reconnect AC power to unit. Pen will align itself and begin normal recording.
9. Contrast can be adjusted if darker recording required. See Thermal Print Contrast
Adjustment (Page 27).
Figure 2.9 Thermal Recorder Platen Layout
Battery Backup “Ink Style” Units
The 9-volt DC battery back up will allow the recorder to continue to function normally
for approximately 48 hours in the event of a power failure. Units with display option will
maintain 24 hour of operation upon power loss.
The state of the green LED (listed below) assists in indicating battery condition when a
recorder has this option feature.
• If green LED is on continuous, battery voltage is acceptable.
• If green LED is flashing rapidly, battery voltage is below 7.5 VDC, replace
battery.
• If green LED is not on battery voltage is insufficient and AC power off.
The battery strap and battery holder are located on the front of the chart plate. Refer to
Figure 2.10 (Page 17). In order to change the battery, you must open the recorder case
door. Note: Use only NEW 9-volt alkaline replacement batteries.