Disassembling the Canon AE-1
The Canon AE-1 is one of the most frequently seen models in the Canon A-series. Unlike its closest counterpart, the Canon AE-1 Program, which allows screen cleaning from the mirror chamber, the AE-1 does not, which can be frustrating.It has a common issue known as the "shutter squeak," but compared to the AE-1 Program, the symptoms are less severe and can be fixed easily. The repair method is the same as for models like the A-1.
References:
- [Disassembling the Canon AE-1 Program]
- [Replacing the Canon AE-1 Program Battery Cover]
Basic Knowledge
Battery Check
The button next to the rewind crank is the battery check. If the battery is fresh, pressing the button will make the exposure needle point near F/2.8. As the battery depletes, the needle rises toward larger F-numbers. If the needle is above F/5.6, it's time to replace the battery. Sometimes the button may not respond with a light press, so press it firmly to check.
For the AE-1 Program, this operation triggers a sound.
Exposure Meter Check
Even if the shutter works and the speed changes after inserting the battery, don't be too quick to assume everything is fine. Occasionally, there may be issues with the AE system.
If changing the shutter speed does not move the exposure needle, and the red light stays on, the AE system is defective. While such defects are more common in the AE-1 Program and can often be repaired, AE-1 repairs are difficult. Internal wires connected to the exposure system may be severed, making the repair unfeasible.
Removing the Top Cover
Preparations
Before removing the top cover, set the shutter dial to "B" and the ASA to 3200. Failure to do so can increase tension on the internal adjustment string, causing it to snap easily.
Removing the Back Cover
Start by removing the back cover. Push down the hinge pin to detach it.
Removing the Advance Lever
To remove the advance lever cover, press down with a rubber mat and twist. If it doesn’t budge, apply alcohol and try again. If it still won’t turn, lightly tap the cover with a plastic hammer before attempting to unscrew it. Avoid using notched tools, as they can slip and scratch the surface.
After removing the cover, pull the lever out, including the washer. Use pliers to remove the metal fastener underneath.
Removing the Rewind Crank
The rewind crank is often tightly secured. Apply alcohol to the junction between the shaft and crank. Insert the handle of tweezers into the fork inside the film chamber to hold it in place, then twist the head counterclockwise to remove it. Underneath, you’ll find a C-clip that can be removed with specialized tools or two small screwdrivers.
Cleaning the Eyepiece
With the top cover removed, you can clean the viewfinder. Remove the two screws near the eyepiece and gently pull the eyepiece assembly backward. Clean the back of the eyepiece and the rear of the prism. Removing the prism for screen cleaning is difficult and should only be attempted when visibility is severely impaired.
Reassembling the Camera
When reattaching the shutter dial, hold it at an angle and align the protrusion with the notch below. Rotate slightly counterclockwise to set it at "B."
Fixing Shutter Issues
Canon A-series cameras often experience shutter malfunctions, but they can be surprisingly easy to fix. The most common causes are:
- Insufficient battery power
- Faulty battery terminal contacts
- Electrical issues in the shutter’s magnet system
Battery Voltage
The most common issue is low battery voltage. Note that the power required for the shutter differs from that for the exposure meter. A meter may function while the shutter lacks sufficient power. Always check the battery first.
Fixing Sunken Battery Terminals
If the battery terminals are recessed, they may fail to make proper contact. Corrosion is often the cause. Apply a rust remover, such as CRC 5-56, and gently tap the terminal with a rounded chopstick and a hammer to free it.
Cleaning Magnet Contacts
If the battery and terminals are fine, clean the magnet contacts inside the bottom panel. Carefully remove the protective plastic cover and clean the metal contacts using alcohol-soaked cotton. Avoid damaging the delicate parts during this process.
Adjusting AE and Exposure Meter
The AE and exposure meter can be adjusted by moving the resistors visible after removing the top cover. However, the readings may differ with the cover on or off, so a specialized cover with holes for access is helpful. The front resistor controls the exposure meter, while the rear resistor adjusts the AE system.
Conclusion
Disassembling the Canon AE-1 requires patience and care, especially when dealing with delicate internal components like the shutter system and AE mechanisms. However, with the right tools and knowledge, many issues can be resolved, breathing new life into this classic camera.