Synology SA3400 Hardware Installation Guide - Page 23

Replace Power Supply Unit (PSU) If a PSU or its fan malfunctions, please see the instructions below to replace the malfunctioning PSU. 1 Unplug the power cord from the PSU to be replaced. Note: By pressing the Beep Off button, you can silence the long beeping sound when you hear it. 2 Push the lever of the PSU at the back panel in the indicated direction. 3 Pull out the PSU from your SA3400. 4 Prepare a new PSU, and push it back to the slot until you hear a click. Initial Troubleshooting Guide We have selected several helpful articles on frequently asked questions to help you do initial troubleshooting on your Synology NAS: • General • What can I do to troubleshoot NAS connection problems? • What is the width of my Synology NAS server? • Hard Disk Drive • How to choose the right HDD for my Synology NAS • How to diagnose drives' health status when receiving bad sector warning • How to fix hard drive failure and retrieve the data from your hard drives • Memory • Are there any requirements for installing or expanding system memory capacity? • How can I run a memory test on my Synology NAS? • Why is there a startup delay after a memory upgrade? • LED • How do I recognize a hibernating Synology NAS via the LED indicators? • What can I do if the STATUS LED keeps flashing in orange? • Why am I unable to install my Synology NAS and why is the Power LED indicator flashing constantly? • Why are the LED indicators on the LAN ports of my Synology NAS not working? • Fan • What type of fan speed modes are available on my Synology NAS? 23 Chapter 3: System Maintenance