The other day I was trying to reprogram my old bot's line follower and I think I have a CNY70 (http://www.vishay.com/docs/83751/cny70.pdf) that is fried.
The line follower schematics is http://www.adrirobot.it/robot_deagostini/line_follower/line_follower.htm (Fascicolo n°49) and the program I used is described in Fascicolo n°57
The problem is that 1 of the CNY's in the program is always showing that is has a line under it even if it has none. The others work fine. Is there a way to check if the CNY's receiver part is fried?