1. Okwu mmalite
This manual provides detailed instructions for the assembly, installation, operation, and maintenance of your JONSBO D400 Black ATX Mid-Tower PC Case. Please read this manual thoroughly before beginning installation to ensure proper setup and safe operation.

Figure 1: JONSBO D400 Black ATX Mid-Tower PC Case with internal components.
2. Akụrụngwa Ngwaahịa
- Akụkụ: 488mm (L) x 239mm (W) x 514mm (H) (including feet).
- Nhazi: Three-dimensional, beveled, curved glass design for clear visibility of internal hardware.
- Nkwado motherboard: Compatible with ATX, Micro-ATX, and Mini-ITX BTF motherboards.
- GPU Compatibility: Supports graphics cards up to 450mm in length.
- Nkwado PSU: ATX PS2 power supplies, up to 200mm in length.
- Nhọrọ oyi:
- Air Cooling: CPU cooler height up to 169mm.
- AIO Support: Top 240mm / 280mm / 360mm (optional); Side 360mm (optional).
- Fan Positions: Top (3x 120mm or 2x 140mm), Side (3x 120mm), Rear (1x 120mm), Power Compartment (3x 120mm).
- Bgbọala Oge: 2x 2.5" SSD or 1x 3.5" HDD + 1x 2.5" SSD; 1x 2.5" SSD or 1x 3.5" HDD in PSU compartment.
- Ọdụ ụgbọ mmiri I/O n'ihu: 1x USB 3.2 Gen2 Type-C, 2x USB 3.0, 1x Audio + 1x Mic (2-in-1).
- Oghere Mgbasawanye: 7.

Ọgụgụ 2: Akụkụ ihu view of the JONSBO D400 PC Case highlighting the curved glass design.

Ọgụgụ 3: Ngwaahịa gafereview highlighting the D400's design and features.
3. Ntọala & nwụnye
3.1 Nwụnye motherboard
The JONSBO D400 supports ATX, Micro-ATX, and Mini-ITX BTF motherboards. Ensure your motherboard is compatible with the case's mounting points. The case is designed to support through-hole for most back-connect motherboards, which helps in reducing visible cables inside the case for a cleaner aesthetic.

Figure 4: Internal layout of the D400 case, ready for motherboard installation.

Figure 5: Illustration of BTF motherboard compatibility and cable management space.
3.2 GPU Installation
The case accommodates GPUs up to 450mm in length. It features 7 PCI slots and supports vertical GPU installation (cable not supplied, requires a third-party adapter bracket).

Figure 6: GPU installation options and length compatibility.
3.3 Ngwa na-enye ike (PSU) nwụnye
The JONSBO D400 supports ATX PS2 power supplies up to 200mm in length. The power supply is located at the bottom of the case with independent airflow channels to ensure stable chassis temperatures.

Figure 7: PSU mounting location and dust filter access.
3.4 Nwụnye sistemu jụrụ oyi
The case offers extensive cooling support with 10 fan positions and dual AIO radiator support. CPU air coolers up to 169mm in height are supported.
- Top: 3x 120mm or 2x 140mm fans (optional) / 240mm, 280mm, or 360mm AIO radiator (optional).
- Side: 3x 120mm fans (optional) / 360mm AIO radiator (optional).
- Rear: 1x 120mm fan (optional).
- Power Compartment: 3x 120mm fans (optional).

Figure 8: Fan and AIO radiator placement options.
3.5 Drive Bay Configuration
Ikpe ahụ na-enye nhọrọ nchekwa na-agbanwe agbanwe:
- Back Side: 2x 2.5" SSD or 1x 3.5" HDD + 1x 2.5" SSD.
- PSU Compartment: 1x 2.5" SSD or 1x 3.5" HDD.

Figure 9: Hard drive and SSD mounting locations.
3.6 Ọdụ ụgbọ mmiri I/O n'ihu
The front I/O panel includes:
- 1 x USB 3.2 Gen2 Ụdị-C
- 2x USB 3.0
- 1x Audio + 1x Mic (2-in-1)
4. Ntuziaka ọrụ
After successful assembly, connect all necessary peripherals and power cables. Press the power button on the front I/O panel to start your system. Refer to your motherboard and component manuals for specific operating instructions related to your installed hardware.
Video 1: JONSBO D400 ATX PC case overview, demonstrating internal layout and features.
5. Nlekọta
5.1 Nhicha
Regular cleaning is essential for maintaining optimal performance and longevity of your PC components. Use compressed air to remove dust from fans, radiators, and internal components. Ensure the system is powered off and unplugged before cleaning.
5.2 Nzacha uzuzu
The JONSBO D400 includes a bottom dust filter. Regularly remove and clean this filter to prevent dust buildup and maintain good airflow. The grille-shaped top cover also allows for multi-angle quick disassembly for cleaning and customization.

Figure 10: Top cover disassembly for maintenance and customization.
6. Nchọpụta nsogbu
Ọ bụrụ na ị hụ nsogbu, mee nyocha ndị a:
- Enweghị ike: Ensure all power cables (PSU, motherboard, GPU) are securely connected. Check the power switch on the PSU.
- Enweghị Ngosipụta: Verify that your monitor cable is connected to the graphics card (not the motherboard's integrated graphics ports, unless you are using integrated graphics). Reseat the GPU and RAM modules.
- ekpo oke ọkụ: Check fan connections and ensure they are spinning. Clean dust filters and internal components. Verify AIO pump operation if installed.
- Achọpụtaghị akụrụngwa: Reseat the component (e.g., RAM, GPU, SSD). Check power and data connections.
For more complex issues, consult the manuals for your individual components (motherboard, GPU, PSU, etc.) or contact JONSBO customer support.
7. Nkọwapụta
| Njirimara | Nkọwapụta |
|---|---|
| Ụdị | Jonsbo |
| Aha Nlereanya | D400 |
| Ụdị ikpe | Mid Tower |
| Agba | Nwa |
| Ihe onwunwe | Ọla |
| Akụkụ ngwaahịa (LxWxH) | 488 x 239 x 514 mm (19.21 x 9.21 x 20.43 inch) |
| Ibu Ibu | 23.5 pound |
| Ndakọrịta Motherboard | ATX, Micro-ATX, Mini-ITX (BTF Motherboard Support) |
| GPU Length (Max) | 450mm |
| CPU Cooler Height (Max) | 169mm |
| Nkwado PSU | ATX PS2 (up to 200mm) |
| Nkwado AIO Radiator | Top: 240/280/360mm (Optional); Side: 360mm (Optional) |
| Fan Positions | Top: 3x 120mm / 2x 140mm; Side: 3x 120mm; Rear: 1x 120mm; Power Compartment: 3x 120mm |
| Ụgbọ okporo ígwè | 2.5" SSD*2 or 3.5" HDD*1+2.5" SSD*1; 2.5" SSD*1 or 3.5" HDD*1 (PSU Compartment) |
| N'ihu I / O Ports | USB3.2 Gen2 Type-C*1 / USB3.0*2 / AUDIO*1+MIC*1 (2 in 1) |
| Oghere Mgbasawanye | 7 |

Figure 11: Visual representation of JONSBO D400 dimensions and key specifications.
8. Akwụkwọ ikike & Nkwado
For warranty information, technical support, or further assistance, please refer to the official JONSBO website or contact your retailer. Keep your purchase receipt as proof of purchase for warranty claims.
JONSBO is committed to providing high-quality products and customer satisfaction. If you have any questions or require support, please do not hesitate to reach out.
Visit the Jonsbo Store: Jonsbo Official Store