IBM 4230 User Guide - Page 241
Replace the ribbon.
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P a p e r P re se n t S ensor To clean this sensor: 1. Turn the power Off (O). 2. Remove the ribbon. 3. Hold the sensor in place by pushing it down with a finger. 4. Clean the front surface, opposite the wires and closest to the paper, with a cotton swab or a piece of cloth. 5. Replace the ribbon. 6. Turn the power On (|). If this does not correct the false reading, call for service. Appendix B. Problems B-11
Paper
Present
Sensor
To clean this sensor:
1. Turn the power Off (O).
2. Remove the ribbon.
3. Hold the sensor in place by pushing it down with a finger.
4. Clean the front surface, opposite the wires and closest to the
paper, with a cotton swab or a piece of cloth.
5. Replace the ribbon.
6. Turn the power On (|).
If this does not correct the false reading, call for service.
Appendix B. Problems
B-11