the front plate of the Alfa comes off easily by removing the antenna and depressing the two tabs out of their slots at the front. behind the front plate is nothing more than a relatively simple circuit board. Not much info will be garnered by putting a multimeter on perfectly working components on the cb. Particularly since it will most likely not be *Considered* a repairable circuit board. (unless you like chasing replacement electrical components made in China). Does Alfa offer a replacement Circuit board? It will probably end up costing as much as a replacement Alfa 500mw interface; if they even do offer it.