Error while reading or writing printhead bits
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 ...
Error while reading or writing printhead bits
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Reseat printhead. Replace printhead. Reseat Trailing cable. Replace Carriage PCA. Replace Carriage without PCA/Line sensor. Replace Engine 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 component that deposits ink onto the media. DesignJet printers use thermal inkjet printheads that fire tiny droplets of ink through microscopic nozzles.
A calibration process that ensures all printheads are precisely aligned relative to each other for accurate color registration and sharp output.
When the printhead physically contacts the media surface during printing, potentially damaging both the print and the printhead.
A numeric or alphanumeric code displayed on the printer's front panel or in diagnostic logs that identifies a specific hardware or software malfunction.
The HP 711 Printhead (C1Q10A) is the replacement printhead for HP DesignJet T120, T520, T125, T130, T525, and T530 printers.
The HP 712 Printhead is designed for HP DesignJet T210, T230, T250, T630, T650, and Studio series printers.
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