Sega Pico pen

Sega Pico Pen Repair

When I bought a second-hand Sega Pico in 2015, I immediatly noticed that something must be wrong with it. I didn’t expect a lot of interactivity or gameplay, but at least it should let me draw something. It turned out that the pen was registering the position/movement and also made a clicking noise when pressed down, but nothing else happened. The error was quickly found and repaired (broken micro switch), but the photos have been waiting on my hard drive ever since. A short repair instruction was posted on the ASSEMblergames board in the following year, so I didn’t see the need to rush out an article. Well, here we go:

The label of the pen is missing and it seems that somebody tried to open it up before me:

Sega Pico pen
Sega Pico pen
Sega Pico pen

The screw that holds everything together is hidden in the left hole.

Sega Pico pen

This is how the pen works: upon pressing down the pen on the drawing area, the whole assembly is pushed against the spring, which triggers the micro switch.

Sega Pico pen - inside
Sega Pico pen – inside
Sega Pico pen - inside

A continuity tester revealed that the micro switch is indeed not functioning.

Sega Pico pen - inside
Sega Pico pen - micro switch removed
Sega Pico pen – micro switch removed

I couldn’t find a replacement micro switch with the right measurements, so I chose one with a larger button that I could file down.

Sega Pico pen - new micro switch
Sega Pico pen – new micro switch

Some tape to prevent the spring from jumping away. It also reduces noise of the new switch.

Sega Pico pen - new micro switch

Inside the Sega Pico

Not related to the pen repair at all, but here are some more pictures from the inside of the console that I took back then (apologies for the flash).

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