Hi
Tried to erase a eprom 27c64 trough the window with UV-light from a "sun-lamp". The lightsource works well to make PCB with photores. Distans from lamp 25 cm. Time 1 hour. BUT NOTHING HAPPENS IN THE MEMORY. Its still programmed with old info instead of all High or all Low.
Whats wrong????
Rgds
Ludvig
I think the SUN Lamp is Infra Red, not UV. UV light is distictively bluish purpulish in color and is very very dangerous to eyes. For erasing you need a commercially avaialble cheap eraser that uses high intensity UV light. It can erase a 27c64 in 5 to 10 minutes.