Originally Posted by
Paul Ewins
I don't have a diagnosis, but perhaps can spark some ideas. The 0,1 & 3 electronics all work the same basic way. The shutter fires at the same speed every time (the highest) but there is an electronically timed delay between the shutter opening and closing. i.e. 1/500 = 1/500 + no delay, 1/250 = 1/500 + 1/500 delay, 1/125 = 1/500 + 3/500 delay and so on. The delay is regulated by resistance. This is achieved by a semi-circular circuit board with a range of resistors mounted on it. As you move the speed selection lever around it moves from one resistor to the next. If it was just one speed or range of speeds not working then I would look at the resistors. Since it is an intermittent fault it could be that the solenoid that holds the shutter open (i.e. delays the closing) is somehow faulty and is sticking open. If it wasn't working at all then I would expect it to fire at the highest speed only, which is what happens if you don't have a battery.
Bookmarks