There may be a paper or carriage jam. Check and clear the paper path if necessary. Also clean the carriage encoder strip.
Last updated: February 22, 2026
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HP Designjet 500 & 800 Error 86:01 AFTER Belt Replacement
Troubleshoot error 86:01 on your DJ 500/800 after replacing the carriage belt. Here are the most common causes of error 86:01 ...
There may be a paper or carriage jam. Check and clear the paper path if necessary. Also clean the carriage encoder strip.
- 1
Turn off the printer
- 2
There may be a paper or carriage jam. Check and clear the paper path if necessary. Also clean the carriage encoder strip.
- 3
Restart the printer
- 4
If error persists, contact HP Support
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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Related Questions
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.
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.
Paper with a special coating that improves ink adhesion, color vibrancy, and sharpness compared to uncoated (plain) paper.
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 motor responsible for feeding media through the printer in precise increments between each pass of the printhead carriage.
Software that converts vector graphics, text, and images into a raster (bitmap) format that the printer can output. Essential for processing complex design files.
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