1. Introduction
Welcome to the user manual for your new Osaki Sonno XT-1 GravZero Recliner. This manual provides essential information for the safe and effective use, setup, operation, maintenance, and troubleshooting of your recliner. Please read this manual thoroughly before operating the product and retain it for future reference.
Important Safety Information:
For safe use, always refer to this user manual for weight limits and instructions on how to properly use all features, including the GravZero reclining function. Ensure the recliner is placed on a stable, level surface. Keep children and pets away from moving parts.
2. Product Overview
The Osaki Sonno XT-1 GravZero Recliner is designed to provide a relaxing experience with advanced features and a luxurious design. Key features include:
- GravZero Reclining: Distributes body weight evenly to reduce spinal pressure.
- Lumbar Heating: Gentle warmth for the lower back to enhance muscle relaxation.
- 3 Cell Full Spinal Air Massage: Targeted air massage along the spine for improved circulation and muscle relief.
- Memory Foam: Provides enhanced comfort and support.
- Luxurious Faux Leather and Wooden Legs: Combines aesthetic appeal with durability.

Figure 2.1: The Osaki Sonno XT-1 GravZero Recliner in black, showcasing its design.

Figure 2.2: Detailed view of the faux leather upholstery, highlighting its texture and finish.

Figure 2.3: The solid luxurious wooden legs providing stability and aesthetic appeal.
3. Setup
The Osaki Sonno XT-1 GravZero Recliner requires no assembly. It is designed for immediate use upon delivery.
3.1 Placement
Place the recliner on a flat, stable surface. Ensure there is adequate space around the recliner for full reclining motion, especially behind and in front of the unit. Avoid placing the recliner in direct sunlight or near heat sources to prevent material degradation.
4. Operating Instructions
Your recliner comes with a remote control to manage all its functions. Familiarize yourself with the remote before use.
4.1 Remote Control Overview

Figure 4.1: The remote control for the Osaki Sonno XT-1 GravZero Recliner.
The remote features dedicated buttons for power, reclining positions, massage functions, and heating. Refer to the icons on the remote for specific functions such as Z-G (Zero Gravity), Stretch, Relax, Heat, Lumbar, Backrest, and Legrest adjustments.
4.2 GravZero Reclining
To activate the GravZero reclining position, press the 'Z-G' button on the remote. The chair will gently move into a position that elevates your legs above your heart, distributing your body weight evenly and reducing pressure on your spine. To adjust or return to an upright position, use the 'Backrest' and 'Legrest' adjustment buttons.

Figure 4.2: Illustration showing the recliner in the GravZero (Zero Gravity) position.
4.3 Lumbar Heating
To activate the lumbar heating function, press the 'Heat' button on the remote. Gentle warmth will be applied to the lower back area, promoting muscle relaxation and improving circulation. Press the button again to deactivate the heating function.

Figure 4.3: Visual representation of the lumbar heating zone within the recliner.
4.4 3 Cell Full Spinal Air Massage
The recliner features an advanced air massage system. To activate, press the 'Lumbar' button or select a massage program if available. The three air cells will inflate and deflate along your spine, providing targeted pressure and promoting blood flow. Adjust intensity using the '+' and '-' buttons if applicable.

Figure 4.4: Diagram illustrating the 3-cell full spinal air massage system.
5. Maintenance
5.1 Cleaning Instructions
The faux leather upholstery of your recliner should be cleaned by wiping it with a clean, damp cloth. For tougher stains, use a mild soap solution and then wipe thoroughly with a clean, damp cloth to remove any soap residue. Avoid using harsh chemicals, abrasive cleaners, or solvents, as these can damage the material.
5.2 General Care
- Regularly inspect all connections and moving parts to ensure they are secure and functioning correctly.
- Keep the recliner away from sharp objects to prevent punctures or tears in the upholstery.
- Avoid prolonged exposure to direct sunlight to prevent fading and cracking of the faux leather.
6. Troubleshooting
If you encounter any issues with your Osaki Sonno XT-1 GravZero Recliner, please refer to the following common troubleshooting steps:
- No Power: Ensure the power cord is securely plugged into both the recliner and a functional wall outlet. Check the power switch on the recliner, if present, to ensure it is in the 'ON' position.
- Reclining Function Not Working: Verify that the remote control is properly connected and has power. Check for any obstructions around the moving parts of the recliner.
- Massage or Heating Not Activating: Confirm the recliner is powered on. Ensure you are pressing the correct buttons on the remote for the desired function.
- Unusual Noises: If you hear unusual noises, immediately cease use and inspect the recliner for any loose components or foreign objects. Do not attempt to repair internal mechanisms yourself.
If the problem persists after attempting these steps, please contact customer support for further assistance.
7. Specifications
Detailed specifications for the Osaki Sonno XT-1 GravZero Recliner:
| Feature | Detail |
|---|---|
| Brand | Osaki |
| Model Number | Osaki Sonno XT-1 GravZero Recliner |
| Color | Black |
| Product Dimensions (D x W x H) | 37"D x 29.3"W x 42.1"H |
| Item Weight | 135 pounds |
| Maximum Weight Recommendation | 270 Pounds |
| Back Style | Solid Back |
| Special Feature | Reclining, Lumbar Heating, Air Massage |
| Product Care Instructions | Wipe Clean |
| Fill Material | Memory Foam |
| Furniture Finish | Faux Leather |
| Included Components | Remote |
| Assembly Instructions | No assembly required |
| UPC | 810081882781 |

Figure 7.1: Dimensional diagram of the Osaki Sonno XT-1 GravZero Recliner.
8. Warranty and Support
8.1 Warranty Information
Your Osaki Sonno XT-1 GravZero Recliner comes with a comprehensive warranty. Enjoy peace of mind with our industry-leading 5-year warranty covering all parts and labor for 3 years, and parts for an additional 2 years. This ensures your recliner continues to provide relaxation and therapeutic benefits.
8.2 Customer Support
For any questions, concerns, or warranty claims, please contact Osaki customer service. Our dedicated team is ready to assist you. Refer to the product packaging or the official Osaki website for the most current contact information.





