I am often asked how to put together a ERS-210. I will try to explain 🙂
Locate the frontside of the core unit.
If you have a lan card, insert at the rear side.
Push in the card completely.
Identify the legs.
Lay down the core with the front side to your right.
Slide in the rear right leg from the back side (left to right).
Slide in the front right leg from the front side (right to left).
Turn over the core.
Same procedure as the right side.
Slide in the rear left leg from the back side (right to left) and
slide in the front left leg from the front side (left to right).
Slide in the head from the front side on the top of the core.
Slide in the tail unit from the back side on the top of the core.
Turn over the dog and put in the memory stick.
Push in the memory stick completely.
Push in the battery, only one direction is possible.
Push in the battery completely.
Now you can close the battery door.
Turn over the dog and get him into sit position.
Now you can power on your Aibo and have fun 🙂