The dew sensor is usually a small flat square about a quarter inch
square or smaller and about a sixteen of an inch thick with two pins or
wires coming out of one edge that is sometimes mounted near the capstan
or in that general area that monitors the level of humidity present
inside the vcr. Maybe take the cover off and blow dry the carrage area
for a few minutes and see if the dew light goes out. If it does then
you are good to go, if it doesn't then you may have a problem in the
circuit that monitors that sensor.