Feed index encoder sensor does not work properly Other potential parts associated: Feed Encoder Disk, Main PCA
Last updated: February 22, 2026
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20180508 185800
hp designjet t 790 new formatter board and hard disk replaced but it does not boot error 08:11.
Feed index encoder sensor does not work properly Other potential parts associated: Feed Encoder Disk, Main PCA
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Remote troubleshooting (call agent) Switch off the printer, and disconnect the power cord. Reconnect the power cord and power on the printer. The call agent should arrange a service engineer visit to change the Feed Index PCA and follow onsite troubleshooting below. Feed Index encoder sensor PCA If a different system error is displayed then the call agent should perform the applicable troubleshooting procedure. Onsite troubleshooting and solution (service engineer) Remove the covers and check that all the cables are well connected to the Main PCA, and none of them are damaged. If any cable is not connected then reconnect it, and power on the printer again to check whether the system error has disappeared. IMPORTANT: If any cable is damaged then order a Cable Service Kit: Cables and sensors Replace the Feed Index Encoder Sensor PCA. Feed Index encoder sensor PCA Check that the Encoder Disk is not dirty or damaged. If the Encoder Disk is damaged, it should be replaced, see Encoder Disk (CQ890-67033) on page 543. Encoder Disk System error:
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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.
Original replacement components manufactured by or for HP, designed specifically for DesignJet printers and guaranteed to meet HP's quality standards.
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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