Synology NAS DS420j Manual

Synology NAS DS420j
Hardware Installation Guide

Table of Contents
Chapter 1: Before You Start
Package Contents 3
Synology NAS at a Glance 4
Hardware Specications 5
Optional Accessories 6
Safety Instructions 7
Chapter 2: Hardware Setup
Tools and Parts for Drive Installation 8
Install Drives 8
Start Up Your Synology NAS 11
LED Indicator Table 12
Chapter 3: System Maintenance
Replace the Malfunctioning Fan 13
Initial Troubleshooting Guide 15
Chapter 4: Install DSM on Synology NAS
Install DSM with Web Assistant 16
Learn More 16
Synology_HIG_DS420j_20190627
2

Thank you for purchasing this Synology product! Before setting up your new Synology NAS, please check the
package contents to verify that you have received the items below. Also, make sure to read the safety instructions
carefully to avoid harming yourself or damaging your Synology NAS.
Package Contents
Main unit x 1 AC power cord x 1
AC power adapter x 1
Screws for 3.5” drives x 18 Screws for 2.5” drives x 18 Screws for securing
drive trays x 8 RJ-45 LAN cable x 1
Before You Start 1
3
Chapter

4Chapter 1: Before You Start
Synology NAS at a Glance
No. Article Name Location Description
1 Status Indicator
Front Panel
Displays the status of the system. For more information, see "LED Indicator
Table".
2 LAN Indicator Displays the status of the network connection. For more information, see "LED
Indicator Table".
3 Power Button
1. Press to power on the Synology NAS.
2. To power o󰀨 the Synology NAS, press and hold until you hear a beep sound
and the Power LED starts blinking.
4 Disk Indicator Displays the status of the installed drives. For more information, see "LED
Indicator Table".
5 Fan
Back Panel
Disposes of excess heat and cools the system. If the fan malfunctions, the
Synology NAS will emit a beeping sound.
6 Power Port Connect the AC adapter here.
7 LAN Port Connect a network cable here.
8 USB 3.0 Port Connect external drives or other USB devices to the Synology NAS here.
9 Reset Button
1. Press and hold until you hear a beep sound to restore the default IP address,
DNS server, and passwords for the admin account.
2. Press and hold until you hear a beep sound, then press and hold again until
you hear three beep sounds to return the Synology NAS to “Not Installed”
status so that DiskStation Manager (DSM) can be reinstalled.
10 Kensington
Security Slot Attach a Kensington security lock here.

Item DS420j
Compatible Drive Type 3.5" / 2.5" SATA x 4
Maximum Internal Raw Capacity 64 TB (4 x 16 TB HDD)
External Ports USB 3.0 x 2
LAN Ports 1GbE (RJ-45) x 1
Size (H x W x D) (mm) 184 x 168 x 230
Weight (kg) 2.21
Supported Clients • Windows 7 and 10
• Mac OS X 10.11 onward
File Systems • Internal: ext4
• External: ext4, ext3, FAT, NTFS, HFS+, exFAT11
Supported RAID Types
• Basic • JBOD • RAID 0 • RAID 1
• RAID 5 • RAID 6 • RAID 10
• Synology Hybrid RAID (up to 2-Disk Fault Tolerance)
Agency Certications • FCC Class B • CE Class B • BSMI Class B
• VCCI • CCC • RCM • RoHS Compliant
HDD Hibernation Yes
Scheduled Power On/O󰀨 Yes
Wake on LAN Yes
Language Localization
Environment Requirements
• Line voltage: 100V to 240V AC
• Frequency: 50/60Hz
•Operating Temperature: 32 to 104˚F (0 to 40˚C)
•Storage Temperature: -5 to 140˚F (-20 to 60˚C)
• Relative Humidity: 5% to 95% RH
Note: Model specications are subject to change without notice. Please refer to www.synology.com for the latest information.
Hardware Specications
5
1Support for exFAT can be enabled by purchasing and downloading exFAT Access in Package Center.

6Chapter 1: Before You Start
Optional Accessories
With Synology accessories, you can customize your Synology NAS to t di󰀨erent business environments without
worrying about compatibility and stability. Visit www.synology.com/compatibility for more information.
•Spare Part
Model Name Picture Description
Disk Tray (Type D1) 3.5"/2.5" HDD Tray 4bay Series
Fan 80*80*20_2 System Fan DS/NVR Series
Adapter 90W_1Adapter 90W Level VI

7Chapter 1: Before You Start
Safety Instructions
Keep away from direct sunlight and away from chemicals. Make sure the environment does not
experience abrupt changes in temperature or humidity.
Place the product right side up at all times.
Do not place near any liquids.
Before cleaning, unplug the power cord. Wipe with damp paper towels. Do not use chemical or
aerosol cleaners.
To prevent the unit from falling over, do not place on carts or any unstable surfaces.
The power cord must plug in to the correct supply voltage. Make sure that the supplied AC voltage is
correct and stable.
To remove all electrical current from the device, ensure that all power cords are disconnected from
the power source.
Risk of explosion if battery is replaced with an incorrect type. Dispose of used batteries appropriately.

Tools and Parts for Drive Installation
• A screwdriver
• At least one 3.5” or 2.5” SATA drive (please visit www.synology.com for compatible drive models)
Warning: If you install a drive that contains data, the system will format the drive and erase all existing data. Please
back up any important data before installation.
Install Drives
1 Remove the 4 screws that secure the back cover by hand, and then put the back cover down carefully.
2 Lift the upper case and then place it aside.
Hardware Setup 2
Chapter
8

9Chapter 2: Hardware Setup
3 Load drives in the drive trays.
• For 3.5” drives: Place the drive in the drive tray. Then tighten the screws to secure the drive in place.
• For 2.5” drives: Place the drive in the blue area (shown below) of the drive tray. Turn the tray upside down
and tighten the screws to secure the drive in place.
4 Insert the loaded drive tray into the empty drive bay.
Note: Make sure the drive tray is completely inserted. Otherwise, the drive might not be able to function properly.
5 Repeat the steps above to install all prepared drives.

10 Chapter 2: Hardware Setup
6 Drives are numbered as shown below.
• For 3.5” drives only: It is recommended that you secure the drive trays with the screws (for securing drive
trays) provided. For drives without the central mounting holes, you can skip this step.
7 Place the upper case back to its position.