{"id":52,"date":"2026-08-27T07:13:22","date_gmt":"2026-08-27T07:13:22","guid":{"rendered":"https:\/\/bulkdevices.co.uk\/blog\/?p=52"},"modified":"2026-10-07T14:20:08","modified_gmt":"2026-10-07T14:20:08","slug":"hp-designjet-printer-parts","status":"publish","type":"post","link":"https:\/\/bulkdevices.co.uk\/blog\/hp-designjet-printer-parts\/","title":{"rendered":"HP DesignJet Printer Parts: The Complete Guide to Every Component"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/bulkdevices.co.uk\/blog\/hp-designjet-printer-parts\/#Quick_Answer_What_Are_the_Main_Parts_of_an_HP_DesignJet_Printer\" >Quick Answer: What Are the Main Parts of an HP DesignJet Printer?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/bulkdevices.co.uk\/blog\/hp-designjet-printer-parts\/#How_an_HP_DesignJet_Printer_Is_Built_System_Overview\" >How an HP DesignJet Printer Is Built (System Overview)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/bulkdevices.co.uk\/blog\/hp-designjet-printer-parts\/#Printhead_Ink_System_Components\" >Printhead &amp; Ink System Components<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/bulkdevices.co.uk\/blog\/hp-designjet-printer-parts\/#Printhead\" >Printhead<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/bulkdevices.co.uk\/blog\/hp-designjet-printer-parts\/#Ink_Cartridge\" >Ink Cartridge<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/bulkdevices.co.uk\/blog\/hp-designjet-printer-parts\/#Ink_Supply_Station_ISS\" >Ink Supply Station (ISS)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/bulkdevices.co.uk\/blog\/hp-designjet-printer-parts\/#Ink_Tubes\" >Ink Tubes<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/bulkdevices.co.uk\/blog\/hp-designjet-printer-parts\/#Paper_Handling_Cutting_Components\" >Paper Handling &amp; Cutting Components<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/bulkdevices.co.uk\/blog\/hp-designjet-printer-parts\/#Cutter_Assembly\" >Cutter Assembly<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/bulkdevices.co.uk\/blog\/hp-designjet-printer-parts\/#Spindle\" >Spindle<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/bulkdevices.co.uk\/blog\/hp-designjet-printer-parts\/#Pinch_Arms_Rollers\" >Pinch Arms \/ Rollers<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/bulkdevices.co.uk\/blog\/hp-designjet-printer-parts\/#Platen\" >Platen<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/bulkdevices.co.uk\/blog\/hp-designjet-printer-parts\/#Carriage_Motion_Components\" >Carriage &amp; Motion Components<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/bulkdevices.co.uk\/blog\/hp-designjet-printer-parts\/#Carriage_Assembly\" >Carriage Assembly<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/bulkdevices.co.uk\/blog\/hp-designjet-printer-parts\/#Carriage_Belt\" >Carriage Belt<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/bulkdevices.co.uk\/blog\/hp-designjet-printer-parts\/#Encoder_Strip_Disk\" >Encoder Strip \/ Disk<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/bulkdevices.co.uk\/blog\/hp-designjet-printer-parts\/#Carriage_Motor\" >Carriage Motor<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/bulkdevices.co.uk\/blog\/hp-designjet-printer-parts\/#Electronics_Control_Components\" >Electronics &amp; Control Components<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/bulkdevices.co.uk\/blog\/hp-designjet-printer-parts\/#Formatter_PCA_Board\" >Formatter \/ PCA Board<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/bulkdevices.co.uk\/blog\/hp-designjet-printer-parts\/#Control_Panel_Assembly\" >Control Panel Assembly<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/bulkdevices.co.uk\/blog\/hp-designjet-printer-parts\/#Power_Supply_Unit_PSU\" >Power Supply Unit (PSU)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/bulkdevices.co.uk\/blog\/hp-designjet-printer-parts\/#Maintenance_Service_Components\" >Maintenance &amp; Service Components<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/bulkdevices.co.uk\/blog\/hp-designjet-printer-parts\/#Service_Station\" >Service Station<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/bulkdevices.co.uk\/blog\/hp-designjet-printer-parts\/#Maintenance_Cartridge_Kit\" >Maintenance Cartridge \/ Kit<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/bulkdevices.co.uk\/blog\/hp-designjet-printer-parts\/#HP_DesignJet_Parts_Glossary_Table\" >HP DesignJet Parts Glossary Table<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/bulkdevices.co.uk\/blog\/hp-designjet-printer-parts\/#Whats_Broken_Symptom-to-Part_Quick_Reference\" >What&#8217;s Broken? Symptom-to-Part Quick Reference<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/bulkdevices.co.uk\/blog\/hp-designjet-printer-parts\/#How_to_Find_the_Right_Part_Number_for_Your_Printer\" >How to Find the Right Part Number for Your Printer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/bulkdevices.co.uk\/blog\/hp-designjet-printer-parts\/#Genuine_HP_Parts_vs_Compatible_Alternatives\" >Genuine HP Parts vs Compatible Alternatives<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/bulkdevices.co.uk\/blog\/hp-designjet-printer-parts\/#Maintenance_Tips_to_Extend_Component_Life\" >Maintenance Tips to Extend Component Life<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/bulkdevices.co.uk\/blog\/hp-designjet-printer-parts\/#Frequently_Asked_Questions\" >Frequently Asked Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-31\" href=\"https:\/\/bulkdevices.co.uk\/blog\/hp-designjet-printer-parts\/#Finding_the_Right_Part_for_Your_DesignJet\" >Finding the Right Part for Your DesignJet<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Quick_Answer_What_Are_the_Main_Parts_of_an_HP_DesignJet_Printer\"><\/span><span style=\"font-weight: 400;\">Quick Answer: What Are the Main Parts of an HP DesignJet Printer?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">An <\/span><b>HP DesignJet printer<\/b><span style=\"font-weight: 400;\"> is built from five core component groups: the ink system (printhead, cartridges, Ink Supply Station), the paper handling and cutting system (cutter assembly, spindle, pinch rollers, platen), the motion system (carriage assembly, belt, encoder strip, carriage motor), the electronics (formatter board, control panel, power supply unit), and the maintenance system (service station, maintenance cartridge). Each part fails in a different, recognisable way, which makes correct identification the first step before ordering a replacement.<\/span><\/p>\n<ul style=\"list-style:disc !important;\">\n<li><span style=\"font-weight: 400;\">The <\/span><b>printhead<\/b><span style=\"font-weight: 400;\"> and <\/span><b>Ink Supply Station<\/b><span style=\"font-weight: 400;\"> control print quality and ink delivery.<\/span><\/li>\n<li><span style=\"font-weight: 400;\">The <\/span><b>cutter assembly<\/b><span style=\"font-weight: 400;\"> trims finished prints cleanly off the roll.<\/span><\/li>\n<li><span style=\"font-weight: 400;\">The <\/span><b>carriage assembly<\/b><span style=\"font-weight: 400;\"> and <\/span><b>encoder strip<\/b><span style=\"font-weight: 400;\"> control precise left-to-right print head movement.<\/span><\/li>\n<li><span style=\"font-weight: 400;\">The <\/span><b>formatter board<\/b><span style=\"font-weight: 400;\"> and <\/span><b>power supply unit<\/b><span style=\"font-weight: 400;\"> control the printer&#8217;s electronics and firmware.<\/span><\/li>\n<li><span style=\"font-weight: 400;\">The <\/span><b>service station<\/b><span style=\"font-weight: 400;\"> keeps the printhead clean between print jobs.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">If you manage or repair an <\/span><b>HP DesignJet printer<\/b><span style=\"font-weight: 400;\">, at some point you&#8217;ll need to identify a failed part before you can order the right replacement. This <\/span><b>HP DesignJet printer parts<\/b><span style=\"font-weight: 400;\"> guide walks through every major component \u2014 what it does, how it fails, and which part number family it belongs to \u2014 so you can diagnose faster and buy with confidence. It&#8217;s written for UK print shops, reprographics bureaus, architecture and engineering firms, and in-house IT technicians who service T-series, Z-series, and legacy DesignJet models themselves. Whether you&#8217;re troubleshooting a fault or simply want a full <\/span><b>HP DesignJet spare parts list<\/b><span style=\"font-weight: 400;\"> and <\/span><b>components guide<\/b><span style=\"font-weight: 400;\"> before raising a support ticket, this article covers every subsystem in one place.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">By the end of this guide, you&#8217;ll be able to match a symptom to the correct component family and locate its part number with confidence.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_an_HP_DesignJet_Printer_Is_Built_System_Overview\"><\/span><b>How an HP DesignJet Printer Is Built (System Overview)<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">An <\/span><b>HP DesignJet printer<\/b><span style=\"font-weight: 400;\"> is made up of five interconnected systems that must all work correctly to produce a print. Understanding how these systems work makes it much easier to trace a fault to the right part instead of guessing.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">The <\/span><b>ink system<\/b><span style=\"font-weight: 400;\"> holds, pressurises, and feeds ink from the cartridge to the nozzles in the printhead. The <\/span><b>paper handling system <\/b><span style=\"font-weight: 400;\">loads media from the spindle, feeds it through the platen, and cuts finished prints. The<\/span><b> motion\/carriage system<\/b><span style=\"font-weight: 400;\"> moves the printhead across the page (the scan axis), and the paper moves under the printhead (the feed axis). The <\/span><b>electronics system<\/b><span style=\"font-weight: 400;\"> (formatter board, control panel, and power supply) controls all other systems and executes the printer&#8217;s firmware. The maintenance system is placed with the printer and its four, and maintains the printhead&#8217;s cap, wiping and priming when the printer is not in use.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">These five core systems rarely fail in isolation. For instance, a worn belt on the motion system may cause banding effects that resemble a printhead problem &#8212; hence why the symptom-to-part table later in this guide.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Printhead_Ink_System_Components\"><\/span><b>Printhead &amp; Ink System Components<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">The ink system encompasses anything in between the ink cartridge and the dot of ink that hits the page, and is the subsystem that most likely will impact visible print quality.<\/span><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Printhead\"><\/span><b>Printhead<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">The <\/span><b>HP DesignJet printhead <\/b><span style=\"font-weight: 400;\">that contains the hundreds of tiny nozzles that squirt out the ink onto the media. Every printhead is assigned to a colour set, and a single nozzle row blockage will result in noticeable banding or a line missing from the print. Printheads are consumables and often one of the first parts that is examined when the quality of the print seems to be suffering, <\/span><span style=\"font-weight: 400;\">since <\/span><b>clogged nozzles <\/b><span style=\"font-weight: 400;\">cause streaky or incomplete prints. The printhead can be replaced by the user on most models of DesignJet without a service call.<\/span><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Ink_Cartridge\"><\/span><b>Ink Cartridge<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">An ink cartridge is the container that holds one colour of ink, and is usually sealed so it can be used with the printhead. A smart chip, which also tells the firmware when it has been installed into a scanner or printer, is a genuine HP cartridge, and when the cartridge will expire reports the ink level and expiry to the firmware; this is why third-party cartridges sometimes give false ink level warnings even if they print well.<\/span><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Ink_Supply_Station_ISS\"><\/span><b>Ink Supply Station (ISS)<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">The<\/span><b> Ink Supply Station (ISS) i<\/b><span style=\"font-weight: 400;\">s the docking bay that keeps the ink cartridges in place and controls ink pressure and flow to the tubes. On larger-format Design Jets, the ISS also maintains air pressure to ensure uniform ink flow over long print runs. Typical symptoms of a failing ISS are inconsistent ink flow or the printer not acknowledging the ink cartridge even though it is in perfect working order.<\/span><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Ink_Tubes\"><\/span><b>Ink Tubes<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Ink tubes carry ink from the ISS to the printhead carriage. If punctured, kinked, or blocked with dried ink after long periods of inactivity, they commonly cause ink starvation or colour contamination.\u00a0<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Paper_Handling_Cutting_Components\"><\/span><b>Paper Handling &amp; Cutting Components<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">All media loading, feeding, and trimming takes place within this subsystem, which is one of the most mechanically active areas on any <\/span><b>HP DesignJet printer.<\/b><b>\u00a0<\/b><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Cutter_Assembly\"><\/span><b>Cutter Assembly<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">The<\/span><b> HP DesignJet cutter assembly<\/b><span style=\"font-weight: 400;\"> is the motorized blade assembly that moves across the platen to cut a finished print clean from the roll. A failed cutter assembly will manifest as jagged or imperfect cuts, a stalled cutting action, or a \u201ccutter error\u201d on the front panel, which can be caused by a worn clutch or a blade that has gone loose. This is the problem that the<\/span> <a href=\"https:\/\/bulkdevices.co.uk\/cq890-67017-hp-cutter-assembly-designjet-t120-t520-series\"><span style=\"font-weight: 400;\">CQ890-67017 cutter assembly for the T120\/T520 series<\/span><\/a><span style=\"font-weight: 400;\"> is engineered to fix \u2014 a true HP replacement piece, consisting of the cutter body, clutch, and extrusion cover fitted as a complete assembly, removing the entire mechanism \u2014 not just the blade.<\/span><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Spindle\"><\/span><b>Spindle<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Paper roll is stored in the spindle and fed to the printer through a tension control system. If the spindle is bent or worn, it feeds paper unevenly, and the prints will be skewed<\/span><span style=\"font-weight: 400;\">.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Pinch_Arms_Rollers\"><\/span><b>Pinch Arms \/ Rollers<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Pinch arms press the media tightly against the drive rollers, ensuring that the paper moves in a straight, controlled line. A frequent problem with worn pinch rollers is that paper slips, or the media does not even move<\/span><span style=\"font-weight: 400;\">.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Platen\"><\/span><b>Platen<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">The platen is the flat surface under the printhead that supports the media being printed or cut. Head strikes or scuffed prints may occur due to debris, ink build-up, or a warped platen.<\/span><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Carriage_Motion_Components\"><\/span><b>Carriage &amp; Motion Components<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">The motion system plays a key role in the accuracy of positioning the printhead, typically with sub-millimetre precision, on each pass, making it one of the more precision-dependent subsystems of the printer.<\/span><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Carriage_Assembly\"><\/span><b>Carriage Assembly<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">The <\/span><b>HP DesignJet carriage assembly<\/b><span style=\"font-weight: 400;\"> is the part that actually carries the printhead and moves back and forth along the scan axis while printing. A print head crash, an abnormal carriage noise, or a printer that doesn&#8217;t initialise at startup time are common symptoms of a failing carriage assembly.<\/span><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Carriage_Belt\"><\/span><b>Carriage Belt<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Carriage belt \u2013 a toothed belt that moves the carriage assembly along the rails. A slipping or stretching belt results in colour misregistration and horizontal banding.<\/span><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Encoder_Strip_Disk\"><\/span><b>Encoder Strip \/ Disk<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">A sensor mounted on the carriage scans a thin strip of film with fine markings on it\u2014this is called the<\/span> <a href=\"https:\/\/bulkdevices.co.uk\/cq890-67003-hp-encoder-strip-assembly-designjet-t120-t520-series-printer\"><b>HP DesignJet encoder strip<\/b><\/a><span style=\"font-weight: 400;\">\u2014that keeps track of the precise horizontal position in real time. The paper-feed axis has a matching encoder disk. A dirty, scratched, or smudged encoder strip is one of the most frequent reasons for banding because the printer doesn&#8217;t have accurate position data, even though the mechanical components may be in good condition.<\/span><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Carriage_Motor\"><\/span><b>Carriage Motor<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">The carriage motor is used to drive the belt and hence the carriage assembly. When the motor stops working, it makes grinding noises or stalls during print, or the carriage won&#8217;t move<\/span><span style=\"font-weight: 400;\">.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Electronics_Control_Components\"><\/span><b>Electronics &amp; Control Components<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">The electronics system ties every mechanical subsystem together and runs the firmware that interprets each print job.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Formatter_PCA_Board\"><\/span><b>Formatter \/ PCA Board<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">The formatter board (also called the PCA board) is the printer&#8217;s main logic board \u2014 it processes incoming print jobs, runs the firmware, and communicates with every other subsystem. A failing formatter board can cause the printer to freeze, fail to boot, or lose network connectivity entirely.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Control_Panel_Assembly\"><\/span><b>Control Panel Assembly<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">The control panel is the front-facing screen and button interface used to configure settings and monitor printer status. A dead or unresponsive control panel doesn&#8217;t always mean the printer itself has failed \u2014 it&#8217;s worth checking the ribbon cable connection to the formatter board first.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Power_Supply_Unit_PSU\"><\/span><b>Power Supply Unit (PSU)<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">The <\/span><b>HP DesignJet power supply unit<\/b><span style=\"font-weight: 400;\"> converts mains power into the regulated voltages the rest of the printer needs to operate. A printer that won&#8217;t power on at all, or that powers off unexpectedly under load, points to the PSU well before any other component.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Maintenance_Service_Components\"><\/span><b>Maintenance &amp; Service Components<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">These parts don&#8217;t touch the printed page directly, but without them, print quality degrades quickly.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Service_Station\"><\/span><b>Service Station<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">The <\/span><b>HP DesignJet service station<\/b><span style=\"font-weight: 400;\"> caps, wipes, and primes the printhead automatically whenever the printer is idle, preventing ink from drying in the nozzles between jobs. A worn service station is a frequent, and frequently overlooked, cause of print quality complaints that get wrongly blamed on the printhead itself.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Maintenance_Cartridge_Kit\"><\/span><b>Maintenance Cartridge \/ Kit<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">The maintenance cartridge collects waste ink and cleaning fluid from servicing routines, while the wider <\/span><b>HP DesignJet maintenance kit<\/b><span style=\"font-weight: 400;\"> typically bundles wipers, a spittoon, and other consumable service parts. Ignoring a &#8220;replace maintenance cartridge&#8221; warning eventually leads to ink overflow inside the printer chassis.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"HP_DesignJet_Parts_Glossary_Table\"><\/span><b>HP DesignJet Parts Glossary Table<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">This <\/span><b>HP DesignJet parts glossary<\/b><span style=\"font-weight: 400;\"> is a quick reference once you&#8217;ve narrowed down which area of the printer is likely affected. Each part name below matches the terminology used consistently throughout this guide \u2014 in the body text, the symptom table, and here \u2014 so you can move between sections without confusion. Use it alongside the symptom-to-part table that follows to confirm your diagnosis before ordering a replacement, whether you&#8217;re checking a genuine HP part number or comparing a compatible alternative.\u00a0<\/span><\/p>\n\n<table id=\"tablepress-7\" class=\"tablepress tablepress-id-7\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\">Part<\/th><th class=\"column-2\">Function<\/th><th class=\"column-3\">Common Failure Symptom<br \/>\n<br \/>\n<br \/>\n<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-striping row-hover\">\n<tr class=\"row-2\">\n\t<td class=\"column-1\">Printhead<\/td><td class=\"column-2\">Fires ink through nozzles onto the media<\/td><td class=\"column-3\">Streaky prints, missing lines, banding<\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\">Ink Cartridge<\/td><td class=\"column-2\">Stores and supplies a single ink colour<\/td><td class=\"column-3\">Inaccurate ink-level readings, colour dropout<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\">Ink Supply Station (ISS)<\/td><td class=\"column-2\">Holds cartridges and regulates ink pressure<\/td><td class=\"column-3\">Inconsistent ink delivery, cartridge not recognised<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\">Ink Tubes<\/td><td class=\"column-2\">Carry ink from the ISS to the printhead<\/td><td class=\"column-3\">Colour contamination, ink starvation<\/td>\n<\/tr>\n<tr class=\"row-6\">\n\t<td class=\"column-1\">Cutter Assembly<\/td><td class=\"column-2\">Trims finished prints from the roll<\/td><td class=\"column-3\">Jagged cuts, cutter error, stalled blade<\/td>\n<\/tr>\n<tr class=\"row-7\">\n\t<td class=\"column-1\">Spindle<\/td><td class=\"column-2\">Holds and feeds the paper roll<\/td><td class=\"column-3\">Skewed or uneven paper feed<\/td>\n<\/tr>\n<tr class=\"row-8\">\n\t<td class=\"column-1\">Pinch Arms\/Rollers<\/td><td class=\"column-2\">Press media against drive rollers<\/td><td class=\"column-3\">Paper slipping, media not advancing<\/td>\n<\/tr>\n<tr class=\"row-9\">\n\t<td class=\"column-1\">Platen<\/td><td class=\"column-2\">Supports media under the printhead<\/td><td class=\"column-3\">Head strikes, scuffed prints<\/td>\n<\/tr>\n<tr class=\"row-10\">\n\t<td class=\"column-1\">Carriage Assembly<\/td><td class=\"column-2\">Holds and moves the printhead across the page<\/td><td class=\"column-3\">Head crashes, carriage noise, failed start-up<\/td>\n<\/tr>\n<tr class=\"row-11\">\n\t<td class=\"column-1\">Carriage Belt<\/td><td class=\"column-2\">Drives the carriage along its rail<\/td><td class=\"column-3\">Horizontal banding, misaligned colours<\/td>\n<\/tr>\n<tr class=\"row-12\">\n\t<td class=\"column-1\">Encoder Strip\/Disk<\/td><td class=\"column-2\">Tracks precise carriage\/paper position<\/td><td class=\"column-3\">Banding, positioning errors<\/td>\n<\/tr>\n<tr class=\"row-13\">\n\t<td class=\"column-1\">Carriage Motor<\/td><td class=\"column-2\">Powers carriage movement<\/td><td class=\"column-3\">Grinding noise, stalling, no movement<\/td>\n<\/tr>\n<tr class=\"row-14\">\n\t<td class=\"column-1\">Formatter\/PCA Board<\/td><td class=\"column-2\">Runs firmware, processes print jobs<\/td><td class=\"column-3\">Freezing, failure to boot, lost connectivity<\/td>\n<\/tr>\n<tr class=\"row-15\">\n\t<td class=\"column-1\">Control Panel<\/td><td class=\"column-2\">Front-facing display and controls<\/td><td class=\"column-3\">Unresponsive screen, blank display<\/td>\n<\/tr>\n<tr class=\"row-16\">\n\t<td class=\"column-1\">Power Supply Unit (PSU)<\/td><td class=\"column-2\">Converts mains power to regulated voltages<\/td><td class=\"column-3\">Won't power on, unexpected shutdown<\/td>\n<\/tr>\n<tr class=\"row-17\">\n\t<td class=\"column-1\">Service Station<\/td><td class=\"column-2\">Caps and wipes the printhead when idle<\/td><td class=\"column-3\">Gradual print quality decline<\/td>\n<\/tr>\n<tr class=\"row-18\">\n\t<td class=\"column-1\">Maintenance Cartridge<\/td><td class=\"column-2\">Collects waste ink and cleaning fluid<\/td><td class=\"column-3\">Maintenance warnings, ink overflow<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-7 from cache -->\n<h2><span class=\"ez-toc-section\" id=\"Whats_Broken_Symptom-to-Part_Quick_Reference\"><\/span><b>What&#8217;s Broken? Symptom-to-Part Quick Reference<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">If you don&#8217;t yet know which part is at fault, start here. Match the symptom you&#8217;re seeing to the most likely component in this <\/span><b>HP DesignJet troubleshooting<\/b><span style=\"font-weight: 400;\"> table before ordering anything.<\/span><\/p>\n\n<table id=\"tablepress-8\" class=\"tablepress tablepress-id-8\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\">Symptom<\/th><th class=\"column-2\">Likely Part<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-striping row-hover\">\n<tr class=\"row-2\">\n\t<td class=\"column-1\">Paper won't cut \/ jagged cuts<\/td><td class=\"column-2\">Cutter Assembly<\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\">Streaky or missing lines in prints<\/td><td class=\"column-2\">Printhead<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\">Printer won't power on<\/td><td class=\"column-2\">Power Supply Unit (PSU)<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\">Horizontal banding across prints<\/td><td class=\"column-2\">Carriage Belt or Encoder Strip<\/td>\n<\/tr>\n<tr class=\"row-6\">\n\t<td class=\"column-1\">Paper feeds crookedly or skews<\/td><td class=\"column-2\">Spindle<\/td>\n<\/tr>\n<tr class=\"row-7\">\n\t<td class=\"column-1\">Cartridge not recognised \/ ink delivery uneven<\/td><td class=\"column-2\">Ink Supply Station (ISS)<\/td>\n<\/tr>\n<tr class=\"row-8\">\n\t<td class=\"column-1\">Printer freezes or won't boot<\/td><td class=\"column-2\">Formatter\/PCA Board<\/td>\n<\/tr>\n<tr class=\"row-9\">\n\t<td class=\"column-1\">Print quality declines gradually over weeks<\/td><td class=\"column-2\">Service Station<\/td>\n<\/tr>\n<tr class=\"row-10\">\n\t<td class=\"column-1\">Paper slips or won't advance<\/td><td class=\"column-2\">Pinch Arms\/Rollers<\/td>\n<\/tr>\n<tr class=\"row-11\">\n\t<td class=\"column-1\">Grinding noise from the carriage<\/td><td class=\"column-2\">Carriage Motor<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-8 from cache -->\n<h2><span class=\"ez-toc-section\" id=\"How_to_Find_the_Right_Part_Number_for_Your_Printer\"><\/span><b>How to Find the Right Part Number for Your Printer<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Always verify the exact model and part number of your printer before ordering replacements, as DesignJet parts are not interchangeable between series, even if two models appear to be very similar.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Use the model number and serial number label, typically on a plate on the back or bottom of the printer chassis. This is a model plate that specifies the exact printer variant; this is important as the same-named part (for instance, a cutter assembly) may exist in a number of slightly different part numbers across the range of T120, T520, T730, and T830 printers. If you have the model number, refer to HP&#8217;s official parts list or the printer&#8217;s service manual for the exact part number, and not just the &#8220;Looks like&#8221; part number. If the fault has already generated an error code on the screen, record that code \u2013 there may be a direct correlation between that code and a specific component family in HP&#8217;s diagnostic documentation.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Genuine_HP_Parts_vs_Compatible_Alternatives\"><\/span><b>Genuine HP Parts vs Compatible Alternatives<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">The decision between <\/span><b>genuine vs compatible HP DesignJet parts <\/b><span style=\"font-weight: 400;\">depends on the printer&#8217;s usage; it&#8217;s a choice of up-front price versus long-term reliability.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">If the part affects calibration or safety, such as the printhead, formatter board, or power supply unit, it is safer to use genuine HP (OEM) parts. These are made to HP\u2019s original specifications and tolerances and are generally covered by the manufacturer\u2019s warranty, although the warranty period can vary depending on the part and region. Compatible or aftermarket parts, such as third-party cutter assemblies or ink cartridges, are usually more affordable and can work well for certain mechanical wear parts, but quality can vary, and some may affect the printer\u2019s warranty. As a general rule, compatible alternatives are best suited to mechanical wear parts, while electronic components that directly affect print quality or printer performance are better kept genuine.\u00a0<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Maintenance_Tips_to_Extend_Component_Life\"><\/span><b>Maintenance Tips to Extend Component Life<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Most DesignJet component failures are gradual rather than sudden, which means a simple <\/span><b>HP DesignJet maintenance tips<\/b><span style=\"font-weight: 400;\"> routine can meaningfully extend the life of the parts covered in this guide.<\/span><\/p>\n<ul style=\"list-style:disc !important;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Clean printheads<\/b><span style=\"font-weight: 400;\"> and run a nozzle check regularly, especially after periods of inactivity, to prevent dried ink from causing permanent clogging.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Clean the cutter rail<\/b><span style=\"font-weight: 400;\"> and platen area to remove dust and paper debris that can jam the cutter assembly or scuff prints.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Keep <\/span><b>firmware updates<\/b><span style=\"font-weight: 400;\"> current, since HP periodically ships firmware fixes for carriage calibration and electronics stability.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Use the <\/span><b>correct media<\/b><span style=\"font-weight: 400;\"> type and weight specified for your model to reduce strain on the pinch rollers and cutter assembly.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Keep the printer environment free of <\/span><b>dust and debris<\/b><span style=\"font-weight: 400;\">, particularly around the encoder strip, where even light smudging can cause positioning errors.<\/span><\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions\"><\/span><b>Frequently Asked Questions<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><b>What are the main parts of an HP DesignJet printer?<\/b><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The main parts of an HP DesignJet printer are the printhead and Ink Supply Station, the cutter assembly and paper handling components, the carriage assembly and motion system, the formatter board and power supply, and the service station.<\/span><\/p>\n<p><b>What is the most common HP DesignJet part to fail?<\/b><span style=\"font-weight: 400;\"> The printhead is the most commonly replaced HP DesignJet part, since clogged nozzles from dried ink cause visible print quality issues faster than most other components.<\/span><\/p>\n<p><b>How do I find the right part number for my HP DesignJet model?<\/b><\/p>\n<p><span style=\"font-weight: 400;\">\u00a0Check the model plate on the rear of your printer for the exact model and serial number, then match that against HP&#8217;s official parts list before ordering any replacement component.<\/span><\/p>\n<p><b>Are compatible (non-genuine) HP DesignJet parts safe to use?<\/b><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Compatible HP DesignJet parts can be safe for mechanical wear parts like cutter assemblies, but genuine HP parts are generally recommended for printheads, formatter boards, and other calibration-sensitive components.<\/span><\/p>\n<p><b>What does the cutter assembly do on a DesignJet printer?<\/b><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The cutter assembly is the motorised blade unit that travels across the platen to trim a finished print cleanly from the paper roll once printing is complete.<\/span><\/p>\n<p><b>How often should HP DesignJet maintenance parts be replaced?<\/b><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Maintenance cartridges and service station components should be replaced when the printer\u2019s firmware displays a maintenance warning. Since replacement intervals depend on print volume rather than a fixed schedule, check the model\u2019s specific maintenance recommendations with the team.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Finding_the_Right_Part_for_Your_DesignJet\"><\/span><b>Finding the Right Part for Your DesignJet<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">As with any DesignJet repair, the hardest part is pinpointing the correct part name and number \u2014 once you have that, ordering the right replacement is straightforward. If you&#8217;d rather not guess, <\/span><a href=\"https:\/\/bulkdevices.co.uk\/\"><span style=\"font-weight: 400;\">see our full range of HP DesignJet spare parts at BulkDevices<\/span><\/a><span style=\"font-weight: 400;\">, covering the ink, paper handling, motion, electronics, and maintenance systems discussed in this guide, all stocked for HP large format printer parts UK delivery. If you&#8217;re not yet certain which category your fault falls under, you can also <\/span><a href=\"https:\/\/bulkdevices.co.uk\/printers-scanners\/printer-accessories\"><span style=\"font-weight: 400;\">browse printer accessories and spare parts<\/span><\/a><span style=\"font-weight: 400;\"> to explore the wider range before committing to a specific part number.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Quick Answer: What Are the Main Parts of an HP DesignJet Printer? An HP DesignJet printer is built from five core component groups: the ink system (printhead, cartridges, Ink Supply Station), the paper handling and cutting system (cutter assembly, spindle, pinch rollers, platen), the motion system (carriage assembly, belt, encoder strip, carriage motor), the electronics [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":205,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6,4],"tags":[],"class_list":["post-52","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-printer"],"_links":{"self":[{"href":"https:\/\/bulkdevices.co.uk\/blog\/wp-json\/wp\/v2\/posts\/52","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bulkdevices.co.uk\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/bulkdevices.co.uk\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/bulkdevices.co.uk\/blog\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/bulkdevices.co.uk\/blog\/wp-json\/wp\/v2\/comments?post=52"}],"version-history":[{"count":7,"href":"https:\/\/bulkdevices.co.uk\/blog\/wp-json\/wp\/v2\/posts\/52\/revisions"}],"predecessor-version":[{"id":207,"href":"https:\/\/bulkdevices.co.uk\/blog\/wp-json\/wp\/v2\/posts\/52\/revisions\/207"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/bulkdevices.co.uk\/blog\/wp-json\/wp\/v2\/media\/205"}],"wp:attachment":[{"href":"https:\/\/bulkdevices.co.uk\/blog\/wp-json\/wp\/v2\/media?parent=52"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bulkdevices.co.uk\/blog\/wp-json\/wp\/v2\/categories?post=52"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bulkdevices.co.uk\/blog\/wp-json\/wp\/v2\/tags?post=52"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}