The critical question here is this: Does the meter react to variations in light
or not? By that I mean does the meter bar go up and down by varying the amount
of light entering the lens _alone_.
If the meter no longer moves up and down as you vary the light level, you've got
a head-amp failure, and nothing will fix it except replacement of the main
circuit (which is no longer available).
To contrast that, we also see erratic meters, where the meter bar jumps up
and/or down, usually upon changes in various inputs such as the ASA, aperture
ring, etc. And with interruptions in power, the whole meter display would
disappear, then reappear, not just the meter "bar". This sort of problem is
usually repairable.
Andrew Dacey wrote:
> ...I began to notice that the meter
> reading in the viewfinder was acting very strangely. It would "bounce"
> between a normal reading (say shutter speed of 125) no reading (well
> massively underexposed, as low at the meter will read). At first this would
> happen very quickly and then act normally but the frequency was increasing.
> Sometimes changing the aperture would fix the problem temporarily, other
> times switching to manual and back to auto would work. It still sounded like
> it was using a proper exposure though when I took the shot. Now however, the
> meter has completely "died" and I don't get any reading with it on auto. If
> I switch to manual and set the lens to wide open and 1s then it shows proper
> exposure (which I suspect is just a default value), this happens even with
> the lens cap on.
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