Carriage – Line sensor connector/cable presence
Last updated: February 22, 2026
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System error code: 86:01 on HP T790 T1300 T2300 Designjet Printer
System error code: 86:01 on HP T790 T1300 T2300 Designjet Printer See this video: https://youtu.be/Lhb-g4gKpKE Carriage ...
Line sensor cannot be detected
- 1
Check the Line sensor cable to the Carriage PCA. Run the 08601 Checks Electronics service diagnostic. Replace the Line sensor. Replace the Carriage PCA.
Reference diagrams for common repair procedures related to this error:
Carriage Belt Replacement
Formatter Board Location & Connections
Note: These diagrams are for reference only. Always consult official HP service documentation and follow proper ESD precautions.
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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 flexible flat cable that connects the carriage assembly to the main PCA, transmitting data and power signals to the printheads as the carriage moves.
Optical or mechanical sensors that detect the presence, type, width, and position of print media loaded in the printer.
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