Problem with the Carriage Encoder Sensor readings
Last updated: February 22, 2026
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Printer Failure HP Designjet T120
Error Printer Failure HP Designjet T120 Print Head Fail https://www.pc-techservice.com/
Problem with the Carriage Encoder Sensor readings
- 1
Check that the Encoder Sensor is correctly connected to the Carriage PCA, clean the Encoder Sensor, replace the Encoder Sensor.
Reference diagrams for common repair procedures related to this error:
Carriage Belt Replacement
Note: These diagrams are for reference only. Always consult official HP service documentation and follow proper ESD precautions.
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Glossary Terms
Related Questions
The mechanism that moves the printheads back and forth across the media during printing. It rides on a guide rail and is driven by the scan-axis motor via a belt.
A transparent plastic strip with precisely printed markings that the printer uses to determine the exact position of the carriage as it moves across the platen.
Optical or mechanical sensors that detect the presence, type, width, and position of print media loaded in the printer.
A numeric or alphanumeric code displayed on the printer's front panel or in diagnostic logs that identifies a specific hardware or software malfunction.
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