Minolta AL selenium meter ISO control
Hello all, I have acquired a Minolta AL which appears to be in good working order other than perished light seals and a non working light meter.
At first I thought the selenium light meter was completely dead, but if I set the camera to 1 second at f2 and hold the cell close to a lightbulb then the needle moves fully into overexposed. Stepping it down a couple of stops the needle moves to the middle which obviously isn't right (f2 1/4 second).
Something I have noticed is that when held to a lightbulb the meter reacts to changes of shutter speed and aperture, but it does not react to changes on the ISO selector. This implies to me that the meter might work but has lost connection to the ISO selector.
I'm assuming the camera hasn't been used for some time as the slower shutter speeds were very slow, after repeatedly firing at 1 second the shutter has now freed up nicely. Assuming that the ISO selector is a similar issue I have been working the ISO control back and forth in an attempt to remove any corrosion from the connections but so far to no joy.
Does anybody know the process of accessing the ISO selector from within the lens to clean the contacts and check that the wire hasn't come loose?
Alternatively are there any other points of failure which could cause results like this?