PHA problem, Carriage PCA, Trailing Cable, Main PCA
Last updated: February 22, 2026
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PHA problem, Carriage PCA, Trailing Cable, Main PCA
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Remove clean and reseat PHA kit, check ink tubes latch, if under warranty arrange for PHA replacement
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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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.
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.
The main logic board inside an HP DesignJet printer that controls all operations, including processing print jobs, managing ink delivery, and communicating with connected devices.
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