1. Introduction
The JSAUX PC0104 ModCase is a comprehensive protective accessory designed for the Steam Deck and Steam Deck OLED. It offers robust protection, enhanced ergonomics, and modular expandability to optimize your gaming experience. This manual provides detailed instructions for installation, usage, maintenance, and troubleshooting.
2. Product Overview
The JSAUX ModCase is engineered to provide full protection and versatility for your handheld gaming device. It features a multi-component design that includes a protective back case, a detachable front shell, a metal bracket (kickstand), and a strap for attaching additional accessories. The modular design allows for seamless integration with other compatible JSAUX accessories, such as cooling fans or power banks.

Image 2.1: The JSAUX ModCase showcasing its modular design with various attachments.
3. Package Contents
Upon opening your JSAUX PC0104 ModCase package, you should find the following items:
- 1 x Steam Deck Protective Back Case
- 1 x Detachable Front Shell
- 1 x Metal Bracket (Kickstand)
- 1 x Silicone Strap

Image 3.1: Contents of the JSAUX ModCase Basic Set package.
4. Setup and Installation
Follow these steps to properly install the JSAUX ModCase on your Steam Deck:
- Install the Protective Back Case: Gently align your Steam Deck with the protective back case. Ensure all ports and buttons are correctly aligned with the case's cutouts. Press the Steam Deck firmly into the case until it is securely seated.
- Attach the Detachable Front Shell: Place the front shell over the screen and joysticks of your Steam Deck. The front shell is designed to snap into place, providing a secure cover for the screen when the device is not in use. To remove, gently peel it off.
- Utilize the Metal Bracket: The metal bracket is integrated into the back case and can be pulled out to function as a kickstand. It offers multiple adjustable angles for comfortable viewing. Ensure the kickstand is fully extended and locked into a notch for stability.
- Attach the Silicone Strap: The silicone strap can be slid onto the modular rail on the back of the case. This allows for secure attachment of other compatible accessories.
Video 4.1: Demonstration of installing the JSAUX PC0104 ModCase components onto the Steam Deck.

Image 4.2: Instructions for attaching the detachable silicone strap.

Image 4.3: Instructions for removing the detachable silicone strap.
5. Operating and Features
The JSAUX ModCase enhances your Steam Deck experience with several key features:
- Comprehensive Protection: Constructed from eco-friendly PC-ABS and silicone, the case prevents the screen from scratching or cracking. The TPU wrap on its edges dampens the shock of a fall, reducing potential damage.
- Perfect Fit and Accessibility: The modular case is precisely designed for the Valve Steam Deck and Steam Deck OLED. All cut-outs are perfectly aligned with the handheld’s output/input ports, ensuring full access to buttons, charging ports, and vents without removing the case.
- Modular Slider: The back cover features a modular slider, allowing you to easily attach and detach compatible accessories such as the JSAUX cooling fan or power bank. This expands the functionality of your Steam Deck.
- Integrated Metal Kickstand: The durable metal bracket provides stable support for your Steam Deck, allowing for hands-free gaming or media consumption at various viewing angles.

Image 5.1: Overview of the ModCase's 360-degree protection features.

Image 5.2: The ModCase demonstrating its drop-resistant capabilities.

Image 5.3: Precise cutouts ensure full access to all Steam Deck functions.

Image 5.4: The modular design supports accessories like a cooling fan for improved heat dissipation.
6. Maintenance
To ensure the longevity and optimal performance of your JSAUX PC0104 ModCase, follow these simple maintenance guidelines:
- Cleaning: Use a soft, damp cloth to wipe down the case and front shell. Avoid harsh chemicals or abrasive cleaners, as these can damage the PC-ABS, silicone, and TPU materials.
- Storage: When not in use, store the ModCase and its components in a clean, dry environment away from direct sunlight and extreme temperatures.
- Inspection: Periodically inspect the case for any signs of wear or damage. If the case is significantly damaged, consider replacing it to ensure continued protection for your Steam Deck.
7. Troubleshooting
If you encounter any issues with your JSAUX PC0104 ModCase, please refer to the following common solutions:
- Difficulty Installing/Removing Case: Ensure the Steam Deck is correctly aligned with the case. The materials are designed for a snug fit, so a gentle but firm application/removal is necessary. Do not force the device into or out of the case.
- Kickstand Instability: Ensure the metal bracket is fully extended and securely locked into one of its designated notches. Avoid applying excessive downward pressure on the kickstand when adjusting or using it, as this can cause damage.
- Accessory Attachment Issues: Verify that any accessory you are trying to attach to the modular slider is compatible with the JSAUX ModCase system. Ensure the accessory is correctly aligned and slides smoothly onto the rail.
For further assistance, please contact JSAUX customer support.
8. Specifications
| Feature | Detail |
|---|---|
| Product Dimensions | 13.78 x 5.91 x 1.57 inches |
| Item Weight | 14.8 ounces |
| Model Number | PC0104 |
| Brand | JSAUX |
| Color | Basic Set |
| Compatible Devices | Steam Deck, Steam Deck OLED |
| Form Factor | Case |
| Shell Type | Hybrid (PC-ABS, Silicone, TPU) |
| Date First Available | January 9, 2023 |
9. Warranty and Support
JSAUX provides an 18-Month worry-free period for the PC0104 ModCase. If you have any questions or require assistance, our dedicated customer support team is available 24/7 to provide friendly client consultation. We are committed to resolving your issues within 24 hours.
For support, please visit the official JSAUX website or contact our customer service directly through your purchase platform.



