In case this project is still alive here is a link to my github with the schematic https://github.com/fdufnews/SMART-Response-XE-schematics

Added information to use the terminal with Arduino IDE https://github.com/fdufnews/SMART-Response-XE-Low_level

Hi,

I have asked SMART Technology if they can release the schematics to the DIY community but they refused.

I have made a copy of your scan and worked on the layers with gimp in order to superimposed one layer's tracks onto the other with a different color. It makes it easier to follow a track from end to end.

Link to the modified scan :

https://www.dropbox.com/s/thjtcojrah4ajq3/smart%20response%20xe%20pcb_color.xcf?dl=0

I am currently working on the schematic. I will release it in a few days as I still need to verify some parts. There is a large amount of resistors that are used to switch options and some parts of the schematics are looking "strange".

I have identified all the components except one. I was not able to find what U5 is. It has an I²C interface, has some decoupling capacitors and what looks like an enable coming from the CPU. I have searched if it can be a serial EEPROM, a voltage monitor, a temperature sensors, and so on but found nothing with a similar pinout.

Nice work! Collecting all that info into one place is super helpful. I haven't had time to work on this project recently but I still have ~30 or so of the devices and intend to use them for something in the future. The repos you've made are a perfect place to jump back in.