The Canon T90 was one of the last manual-focus cameras produced by Canon. It was released in 1986 and was the precursor to the EOS line of autofocus cameras that would follow. The T90 sported a similar body design to the Canon EOS line and included an internal motor drive that would advance film at five frames a second, which was pretty quick at that time. While the camera is a manual focus camera, there is still a fair amount of electronic circuitry inside the camera that is powered by an internal lithium battery. The camera also takes double AA rechargeable or traditional batteries.
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Things you need
- New or recharged AA batteries
- Pencil with eraser on end
Remove the batteries from the camera. You can only remove the "AA" batteries from the camera. The internal lithium battery needs to be replaced by a Canon service tech. If the camera has new "AA" batteries, but the LCD screen on the top of the camera or the information in the viewfinder is not visible then the lithium battery likely needs replacing.
Clean the "AA" battery contacts using an eraser on the end of a pencil. This will fix most of the problems you can fix on the camera. Despite being a manual-focus camera, the shutter and drive system is electronic and needs power to run.
Remove the lens from the front of the camera and inspect the shutter by pressing the shutter release button. Use a slower shutter speed or the "B" setting that will allow you to keep the shutter open for as long as the button is pressed. You want to see if the shutter blades are going up and down in proper sequence. Also inspect the shutter for any apparent fluid or other foreign debris on the shutter blades. If the shutter box is needing to be replaced, sometimes the blades will have a sticky substance on them, from the shutter box mechanism. This repair requires the camera to be sent into Canon.
Replace the "AA" batteries with new or freshly charged, close the battery door, turn the camera on and see if it will function.
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