An awesome student from our education program made this wiki. It is not managed by iFixit staff.
Ninja Master Prep QB900B Troubleshooting
The infamous Ninja Master Prep QB900B, as seen on TV. These easy to follow guides will help make your blender last longer.
- The Button is Stuck
- The Device Won't Turn On
- The Blades Do Not Work
The Button is Stuck ¶
The button is stuck or is difficult to push.
Food is Caught In the Button's Path ¶
If the button is not going up or coming down, food may be lodged inside. The top part of the blender will need to be disassembled for cleaning.
The Spring is Damaged ¶
If the button is hard to push down the cause might be the spring inside. The spring might be rusted or damaged and will need to be replaced.
The Device Won't Turn On ¶
The Prep Master will not start.
The Cord is Broken ¶
Check to see if the cord is plugged into an outlet. If the device still won't turn on, check to see if any part of the cord looks broken or damaged. If you notice any damage to the cord it will need to be replaced.
The Motor is Burnt Out ¶
If there is no visible damage to the cord ,the problem could be the motor. If this is the case, the motor will need to be replaced.
The blender is leaking food or drink.
Rubber Containment Seal (O-Ring) is Dislodged ¶
If food or drink is leaking at the seam of the cup, the rubber seal might be out of place or stretched out. If it is out of place, simply realign it on the groove. If it is stretched out, it will not go back on the groove. To fix this you will need to buy a replacement seal and replace it.
Rubber Containment Seal (O-Ring) is Broken ¶
If food or drink is leaking at the seam of the cup the rubber seal might be broken. You will need to buy a replacement seal and replace it.
The Blades Do Not Work ¶
The blades have become fused to the top part of the Master Prep or are stuck in the cup.
Blades Caught in the Cup ¶
If the blades are lodged in the cup you will need to remove them. If the cup is damaged you will need to replace it to use the device. If the blades are broken you will need to replace them to continue using the device.
Blades Fused to the Motor ¶
If the blades are fused to the motor, you will need to remove them and purchase new ones.
Blades Fused to Each Other ¶
If the blades are fused to each other you will need to pull them apart. If they are damaged you will need to replace them.