--- title: How to change the mainboard (Sigma Series) description: In this article you will learn how to replace the mainboard --- [Skip to content](https://support.bcn3d.com/knowledge/change-mainboard-sigma-series#main-content) - [English](https://support.bcn3d.com/knowledge/change-mainboard-sigma-series) - [Español](https://support.bcn3d.com/es/knowledge/cómo-cambiar-la-mainboard-sigma-series) English Show submenu for translations [Contact support](https://support.bcn3d.com/knowledge/kb-tickets/new?hsLang=en) [Customer portal](https://support.bcn3d.com/repair-service?hsLang=en) ![knowledge-base-header-bcn3d-logo.png\]](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Header/knowledge-base-header-bcn3d-logo.png?height=40&name=knowledge-base-header-bcn3d-logo.png) - [Default HubSpot Blog](https://blog.bcn3d.com/) Open main navigation Close main navigation - [Default HubSpot Blog](https://blog.bcn3d.com/) - - [English](https://support.bcn3d.com/knowledge/change-mainboard-sigma-series) - [Español](https://support.bcn3d.com/es/knowledge/cómo-cambiar-la-mainboard-sigma-series) English Show submenu for translations - [Contact support](https://support.bcn3d.com/knowledge/kb-tickets/new) - [Customer portal](https://support.bcn3d.com/repair-service) - [BCN3D forum](https://www.bcn3d.com/community/) [BCN3D forum](https://www.bcn3d.com/community/) Hello. How can we help you? - There are no suggestions because the search field is empty. 1. [Knowledge base - BCN3D](https://support.bcn3d.com/knowledge?hsLang=en) 2. [Sigma Series](https://support.bcn3d.com/knowledge/sigma-series?hsLang=en) 3. [Troubleshooting](https://support.bcn3d.com/knowledge/sigma-series?hsLang=en#troubleshooting) # How to change the mainboard (Sigma Series) ## In this article you will learn how to replace the mainboard   | **Tools** |   | | --- | --- | | ![allen key icon](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Tools/allen-icon.png?width=21&name=allen-icon.png) | > Allen Key 2.5mm | | ![screwdriver icon](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Tools/phillips-screwdriver-01.png?width=75&name=phillips-screwdriver-01.png) | > Flat Head screwdriver | ---   The mainboard is the part that controls the movement and temperature of the printer. It holds the firmware of the printer. This article will show how to replace the mainboard in case the fuse was unable to protect it from external damage.   **1.** Turn off and disconnect the printer. | ![turn off sigma d25](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Packaging/turn-off-d25.png?width=341&name=turn-off-d25.png) | ![unplug sigma d25](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Packaging/unplug-turn-off-d25.png?width=362&name=unplug-turn-off-d25.png) | | --- | --- |   **2.** Remove the lower bowdens from the FRS. ![bowdens and frs](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Draft/remover-bowden-frs-sigma-d25.png?width=688&name=remover-bowden-frs-sigma-d25.png)   **3.** Remove the bottom Z cable covers. Follow the next article to know the process: [How to remove the Z cable cover.](https://support.bcn3d.com/knowledge/remove-z-cable-cover-bcn3d-epsilon-series?hsLang=en) ![sigma-series-d25-z-cover](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Draft/sigma-d25-z-cover.png?width=688&name=sigma-d25-z-cover.png) **4.** To get access to the inner cover you will need to raise up the printer surface, if you can't turn on the printer, you will need to manually raise the printing platform by spinning the Z motor lead screw. ![z motor lead screw](https://support.bcn3d.com/hs-fs/hubfs/manually-move-lead-screw-d25%20Cropped.png?width=688&name=manually-move-lead-screw-d25%20Cropped.png) **5.** Remove the frontal inner cover. Follow this guide to know how to do it: [How to remove the inner cover](https://support.bcn3d.com/knowledge/remove-inner-cover-bcn3d-epsilon-series?hsLang=en) ![sigma-d25-inner-cover-01](https://support.bcn3d.com/hs-fs/hubfs/sigma-d25-inner-cover-01.png?width=688&name=sigma-d25-inner-cover-01.png) **6.** Disconnect all the cables including all the flat cable connections and unscrew the 3 corners of the mainboard, be sure to keep the plastic loafers. ![flat cable connection](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/General/flat-cable-connecion-bcn3d.png?width=688&name=flat-cable-connecion-bcn3d.png) **8**. Screw the new mainboard and reconnect all the flat cables. ![mainboard-epsilon-sigma-series](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Draft/mainboard-epsilon-sigma-series.jpg?width=688&name=mainboard-epsilon-sigma-series.jpg) **9.** Remember to check the flat cable connections before turn on the printer to prevent shortcircuits. Visit this article to get more information about this: [How to check flat cable connections (Sigma Series)](https://support.bcn3d.com/knowledge/flat-cable-connections-bcn3d-sigma-series?hsLang=en)   **Conclusions** If replacing the mainboard doesn't fix your issue, please get in contact with the support team by filling this form: [Support form](https://support.bcn3d.com/knowledge/kb-tickets/new?hsLang=en). #### **[Forum community](https://support.bcn3d.com/knowledge/bcn3d-forum-community?hsLang=en) ** Repair didn’t go as planned? Check out our **[forum community](https://support.bcn3d.com/knowledge/bcn3d-forum-community?hsLang=en) **for troubleshooting help.   It's important to keep your printer in good shape to make the most out of it. In this chart, you can find a list of the extruder maintenance procedures and how frequently these should be done. [Maintenance Plan](https://support.bcn3d.com/knowledge/maintenance-plan-bcn3d-sigma-series?hsLang=en)   ![bcn3d-recycle](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Tools/bcn3d-recycle.png?width=27&name=bcn3d-recycle.png)  Take your e-waste to a certified recycler. [Check how we do it in BCN3D.](https://support.bcn3d.com/knowledge/environment-bcn3d?hsLang=en) |   **Parts** |   |   Buy these parts | | --- | --- | --- | | ![mainboard 3dmart](https://support.bcn3d.com/hs-fs/hubfs/mainboard%203dmart.png?width=152&name=mainboard%203dmart.png) | Mainboard | [SKU 10909](https://www.bcn3d.com/product/mainboard/)  |   | --- #### RELATED ARTICLES | | --- | | [![check mainboard fuse eng](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Related%20Articles%20English/check%20mainboard%20fuse%20eng.png?width=335&name=check%20mainboard%20fuse%20eng.png)](https://support.bcn3d.com/knowledge/mainboards-fuse-bcn3d-sigma-series?hsLang=en)   | [![check flat cable eng](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Related%20Articles%20English/check%20flat%20cable%20eng.png?width=336&name=check%20flat%20cable%20eng.png)](https://support.bcn3d.com/knowledge/flat-cable-connections-bcn3d-sigma-series?hsLang=en)   | | --- | --- | | **You can help improve the BCN3D Knowledge Base. ** If you feel there are guides that we are missing or you found any error, please use this form to report it. **[Report form](https://share.hsforms.com/1F7t1sBuOQyWlAeRwwFSjgQ3fec5)** :) | | --- | - 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