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I bought a rebel T7, and found that the switch for the battery compartment door is gone. Can't even press it with a screw driver.
I'm looking all over for schematics, to see if I can open it up and replace the switch.
Does anyone have them, or know where I can track them down?
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Oof this is not a fun repair when the PCB took the damage :-(. You can jump the pads on these cameras, but you need to remove the board and hope the actual pad isn't damaged. If the pad is torn, unless you can find the exact point it was wired from and run a jumper wire from the point of failure to the other pad, the main board (or SD card assembly on some newer ones) will need to be replaced, and a sensor cal performed IF the main PCB is damaged.
That said, take that camera apart and show us the extent of the damage. If it's intact but the switch has broken, you can jumper it with solder and get around it for good. The downside to this method is that it permanently removes a safety feature that Canon's DSLR cameras are known for, where they cut power when the cover is opened. It fixes the issue permanently, but you must be extremely careful not to pull the card before you see the image is written (indicated by the blinking LED on the back). I don't know where to source the switch, but I would say check Mouser or DigiKey, or pick up a old camera like the Xs/Xsi with a shutter failure - it's probably the same part. You would of course transfer the switch to the T7, not the entire board.
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So I took it apart, and found the switch bent 90 degrees upwards. I didn't get a picture till after I fixed it, but I soldered it, checked continuity with a multimeter, and reassembled the camera. Unfortunately, that didn't fix the problem, so I ordered a new pcb to put it.
Im worried that the pins/ribbon cables got damaged, I don't think I physically scratched them, or kinked them, they just intimidate me (idk how delicate they are).
Aaand idk how to add photos to a comment
@randysipkes You can forego the PCB though - jump the pads. Fixes it nearly every time and avoids the sensor calibration issue where you need to use TornadoEOS to dump and clone to cal data to the replacement board.
I looked closer at the photo of the switch, and it seems that there is a resistor that is busted, any idea how to go about replacing that? I'll try to jump the pads and see if that fixes things
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The schematics for that board would be in the service manual, which you are very unlikely to find. Canon absolutely refuses to provide any information on the repair of their cameras and lenses, so the only manuals you'll find is ones that have been leaked (which usually is only the parts catalog and not the full service manual).
The easiest way to fix this issue will be to just replace the PCB board that the microswitch is on. The microswitch isn't actually on the main PCB board, but rather is attached to the SD card reader board. Since it's not the main PCB board you'll be replacing, you won't need to do any calibrations or anything after replacement of the board.
You can find a replacement SD card reader board for about $32 on eBay. The part number for the board is CG2-4299. Also note that the SD card reader board is identical in the Canon Rebel T5, Canon Rebel T6, and Canon Rebel T7, so a replacement SD card reader board from any of those cameras will work in your Canon Rebel T7. When you receive the replacement board, I recommend double checking the pins inside of the SD card reader as I have received one once that had a bent pin in it before.
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Every one I have seen does it on the board, to be fair.
@nick Most cameras I've worked on doesn't have it on the main board, but that's mainly due to the specific models I generally work on. I know there are a lot of other models of Canon cameras where it is soldered onto the main board. There's also a couple times I've seen where the card slot will be soldered on the main board, but there will be a separate FPC that houses the microswitch.
@zephosk Ah, so on modular bodies jumping it is (largely) a cheat BUT the ones with the on PCB switch, jump it and save your money. It's not great for someone who can't be cautious but it is effectively the free repair.
So I got a new SD card board, installed it, but still not getting any response from the camera when I turn it on (fresh battery, and SD card that I know works. Any idea how to run diagnostics on it? I tried plugging it into my PC, and it isn't recognizing any device.
@randysipkes I had this issue once while replacing the SD card board. For me, I just had to go back through and check all the ribbon cable connections and that fixed the issue.
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por Randy Sipkes