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This guide shows you how to replace the shutter assembly in the camera. The shutter assembly is a fairly common component to need to be replaced as it has a limited life span and is a delicate part. Note that the cable which connects the shutter motor to the DC PCB board is soldered onto the board, therefore a tiny amount of soldering will be required for this repair.
Replacing the shutter assembly involves removing the image sensor from the camera, therefore extreme care will need to be taken while performing this repair. It is highly recommended that you use an anti-static wrist strap while working inside the camera to prevent electrostatic discharge. Since this repair also involves the image sensor being exposed for a period of time, it's also recommended that you work in a clean environment with minimal dust to avoid dust from getting onto the sensor while it's exposed.
Fortunately, the Canon EOS Rebel T3 utilizes washers to set the images sensor height (whereas some models uses springs). This means that the image sensor should be able to be reinstalled without the need for recalibration.
When you reinstall the main PCB board and are reconnecting the cables, note the single round black cable that leads to the top cover. This cable connects to the right side of the board and the connector is attached to the back of the board. To reconnect it, you simply need to push the cable down into the hole on the connector. This cable is a fiber optics cable used for the camera flash. Forgetting to reconnect this cable will likely cause the camera flash to no longer function.
The Phillips #000 screwdriver is marked as an optional tool as you can always use the JIS #000 screwdriver in its place (JIS screwdrivers won't damage Phillips head screws).
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Pry open the rubber I/F terminal cap with your finger.
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Remove the two M1.7x4.5mm JIS #000 screws that are underneath the I/F terminal cap.
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Using a plastic pick, or another thin plastic prying tool, pop off the I/F terminal cover from the camera.
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On the left side of the camera, remove the following screw:
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One M1.7x4.5mm JIS #000 screw
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On the right side, remove the following screws:
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One M1.7x5.5mm JIS #000 screw
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One M1.7x4.5mm JIS #000 screw
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Carefully lift the back cover partially off of the camera.
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Disconnect the right most ribbon cables from the main PCB board.
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Use a plastic spudger to lift up the black locking tab.
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Pull out the ribbon cable from its connector using a pair of angled tweezers.
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Remove the left ribbon cable using the same two steps as with the other ribbon cable.
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Remove the following screws on the front of the camera.
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Two M1.7x5.5mm JIS #000 screws
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Push up and slide off the eyepiece.
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Remove the following screws:
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Two M1.7x2.5mm JIS #000 screws
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One M1.7x3.6mm JIS #000 diopter screw
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Locate the two ribbon cables on the main PCB board which are marked in the picture.
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Disconnect the ribbon cables.
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Use a plastic spudger tool to carefully push up and disconnect the imaging sensor ribbon cable.
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Locate the remaining four ribbon cables connected to the main PCB board.
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Gently push up on the plastic lock tabs to unlock each of the ribbon cable connectors. Be especially careful with the wide lock tab, as it is particularly fragile.
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Disconnect each ribbon cable from the main PCB board.
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Using a plastic spudger tool, carefully push up and disconnect the ribbon cable from the image sensor.
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Remove the following screws from the image sensor:
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Two M1.7x1.6mm JIS #000 screws
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Three M1.7x5.5mm Phillips #000 screws
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Under where the three M1.7x5.5mm Phillips #000 screws were, you will notice figure eight-shaped washers.
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Use a pair of tweezers to remove the washers.
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On the DC PCB board, peel off the tape covering the shutter assembly power cable.
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Using a plastic spudger tool, lift up the black locking tab on the ribbon cable connector.
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Disconnect the ribbon cable and tuck the end of it away where it'll be safe while soldering.
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Place polyimide tape on the PCB board around the shutter assembly power cables. This is to help protect the components on the PCB board while desoldering the cables.
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Using a soldering iron and desoldering wick, desolder the two shutter assembly power cables from the DC PCB board. The wires should be red and black.
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On the shutter assembly, remove the following screws:
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One M1.7x4.5mm Phillips #000 screw
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One M1.7x7.0mm Phillips #000 screw
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Also remove the metal tab that is held on by the screw.
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Carefully lift off the shutter assembly.
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When reinstalling the shutter assembly, make sure the metal spring gets hooked over the lever for the mirror.
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To reassemble your device, follow these instructions in reverse order. When soldering the new cable to the DC PCB board, be sure not to mix up the positive and negative wires.
To reassemble your device, follow these instructions in reverse order. When soldering the new cable to the DC PCB board, be sure not to mix up the positive and negative wires.
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