Repair Guide for Canon EOS 20D CF Card Slot

Quick guide from the manual

This guide is intended for advanced users comfortable with electronics repair. It details the process of accessing and repairing the Compact Flash (CF) card slot on a Canon EOS 20D. Required tools: Phillips #0 screwdriver, soldering workstation, spudger, and thin multi-stranded wire or solid-core ethernet cable.

Disassembly

Follow these steps to access the CF card slot:

• Eyepiece: Pull up on both sides of the eyepiece cap to remove it. Remove the two screws hidden underneath.
• Rear Panel: Peel off the rubber grip on the back to reveal a hidden screw. Remove both screws from the rear. Remove the two screws from the bottom of the camera.
• Panel Removal: Carefully lift the rear panel. Warning: Do not lift too high to avoid tearing the flex cable or damaging the connector. Use a spudger to flip the lock on the flex cable connector up.
• Cables: Disconnect all labeled connectors by opening their latches. Be careful with the small green connector to avoid tearing the tiny wires.
• Secondary Board: Remove the three screws from the edges of the secondary control board. Flip the board up and out to unscrew the ground connection.
• CF Slot: Open the connector for the CF slot, remove the screw at the bottom, and the two screws at the top to remove the CF slot unit.

Repairing the CF Card Slot

If the CF card slot pins are damaged:

• Bent Pins: Attempt to carefully bend pins back into place. Note that severely bent pins may snap.
• Replacing Pins: If a pin snaps, it can be replaced using a section of solid-core wire from an ethernet cable. The replacement pin should be longer than its neighbors if it is an extended pin.
• Rerouting Traces: If pins are pushed in and rip up traces, you must reroute connections from the bottom vias. Use a sharp tool like an Xacto knife to scratch the solder mask off the vias before soldering.
• Soldering Tips: Taping the connector to your work surface helps with small joints. Ensure no large lumps of solder remain, as they may touch the metal housing.

Reassembly

To reassemble your device, follow the disassembly instructions in reverse order. When reattaching the front panel, insert the left side first to ensure the small lip fits under the camera case.