* J2 is the ZX81 Video Connector, a connector made from two 17 pin strips of precision IC Socket soldered onto the bottom(solder side) of the CPU Board. Make sure this connector has sufficient space from the pads on the solder side so you can solder it to the bottom of the PCB with a thin soldering tip. It is a good idea to always have a few pieces of IC socket strips inserted into those pins you're about to solder so the heat will dissipate without melting the pins loose. Also, the pin strips you insert into the two connectors while soldering can hold them in place.
See the photo page (links on Euro-ZX81 page or CPU Board Page) for a photo of the bottom of the ZX81 CPU Board to illustrate the position of the connector strips and to have an idea what it looks like when soldered in place. The ZX81 Video Board has a similar set of female connectors, but they are soldered on the component side. Both boards are plugged together by a set of male-male precision connector strips, which provide enough space between the boards while assuring a perfect and reliable connection.
 
 
 
 

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