topic Re: T7 works great on battery, won't power up using AC adapter in EOS DSLR & Mirrorless Cameras

T7 works great on battery, won't power up using AC adapter

LGTrader — Tue, 14 Dec 2021 22:40:38 GMT

Hello. I have a T7 which I've owned for about 18 months. I have 3 batteries, 1 Canon, 2 after market, and the camera works perfectly fine with all 3. I use the camera mostly in a small astrophotography rig but I cannot run all night on a single battery so I purchased a Canon AC adapter/USB cable kit. The adapter is a CA-PS700 and the DC coupler is a DR-E10. It fits the camera fine, latches in just like a regular battery. The cable goes through the little opening on the side and the battery cover closes correctly. The camera sadly does not power up. I stuck a volt meter on the DC coupler and it reads 7.6V DC so it appears to be producing power. However when the camera is on the screen is off and I cannot take pictures so it does appear that the camera isn't working.

Does anyone know why this wouldn't work? Is there something in the settings area that I would need to adjust (which I can do using a battery) to enable this feature?

I tried an after market AC power adapter and get the same results.

Thanks in advance for any suggestions on how to get this going.

Re: T7 works great on battery, won't power up using AC adapter

Tintype_18 — Wed, 15 Dec 2021 14:49:35 GMT

Have you used the viewfinder in place of the screen? Does anything show up there? Not able to help with the original question as it has me puzzled, too.

Re: T7 works great on battery, won't power up using AC adapter

LGTrader — Wed, 15 Dec 2021 15:45:31 GMT

I can see through the view finder but it won't focus a lens and I don't even get any of the focus dots.

Over USB with a battery plugged in I can control the camera from my Raspberry Pi controller including remote focusing and viewing live video coming from the T7 in the house on a PC.

With the AC adapter plugged in there's nothing. The Raspberry Pi doesn't see the camera and nothing works at all.

While I don't have an accurate way to measure I have a suspicion that the gold DC Coupler contacts are slightly more recessed inside the plastic than the gold contacts on the batteries. If that's what's happening then possibly the camera just doesn't actually get power at all. I'm doing this by feel with my fingertip and finger nail so it's a highly suspicious measurement.

Not only that but the DC Coupler also has an extra piece of plastic sticking that might serve to stop the coupler from going into the battery compartment as far as a battery. If I suddenly became brave I might consider filing that off but I didn't want to start there.

Thanks for at least conversing on the subject. Much appreciated.

Re: T7 works great on battery, won't power up using AC adapter

LGTrader — Wed, 15 Dec 2021 22:08:48 GMT

SOLVED --- I took the camera into Tucson Camera Repair this morning to have them look at it. It seems that one of the electrical pins down in the battery compartment was pushed down and sticking so she popped it loose and now both the battery and AC power adapter appear to be working fine. I now know what to look at and if it becomes a reoccurring problem I'll look into having it serviced.

Re: T7 works great on battery, won't power up using AC adapter

JFMCGOWAN — Fri, 09 Jun 2023 20:06:48 GMT

THANK YOU! I have a Rebel T8I and was experiencing the same issue. I use my camera on AC power mostly in a studio environment and one day it just stopped working. The AC adapter and the dummy battery tested great. 8.2 Volts of output all the way through.

Your message prompted me to look in the battery compartment and it felt like one of the contacts was lower than the other 3. I gave them a little wiggle with my pinky finger, it popped up, and now it's working again. Thank you for posting your solution. You saved me too!

Re: T7 works great on battery, won't power up using AC adapter

LGTrader — Fri, 09 Jun 2023 20:31:28 GMT

I'm glad it helped.

Re: T7 works great on battery, won't power up using AC adapter

normadel — Fri, 09 Jun 2023 21:56:32 GMT

According to B&H Photo,.....

Camera Compatibility of the DR-E10........

Canon EOS Rebel T3, T5, and T6 cameras

Doesn't sound like it fits the T7.

Is your camera a T7i?