I'm currently preparing for my next service and repair project and am researching the Canon A-1, the direct predecessor of the Canon T90. Fortunately there are more articles and videos available on the A-1 than on the T90.
Crucial for my own work is that there is also an article about the Canon A-1 in the SPT Journal, a C & C Guide and a comprehensive Canon Service Manual with lots of detailed information.
I found a tutorial from a Japanese colleague for service, including removing the mirror box. I was able to follow along easily using the translation function in my iPhone's Safari browser.
I'll start the Canon A-series with the AE-1, since it's the best documented and was also the first in the series. The A-1 will have a lot in common, which I'll benefit from.
It'll start soon
Agenda:
Presentation of the available literature (Larry Lyells!),
removal of the covers and first orientation in the camera,
rough documentation of the circuit as far as possible.
There's already a wealth of repair information on the AE-1 online, including videos. So I won't be able to offer much new information there, but perhaps I'll be able to with the digital circuitry (basing on the excellent articles of Larry Lyells and the repair/service manuals available) which was revolutionary back in 1976.
In any case, I have plenty of repair candidates and am curious to see how I'll get on with the horizontal focal plane shutter. And the tungsten wire that transmits signals via rollers - I think you can find it here
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