Rebel XT/350D re-boot

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Eugene Wendland - 28 Sep 2006 00:36 GMT

Today, something very peculiar happen while shooting with my Canon Rebel
XT/350D. The camera wouldn't "fire". It was working fine, a few seconds
later taking another shot, I couldn't get the shutter to go. The camera
would Auto-Focus and seem to do everything else except shoot the photo. I
then tried to shut the power off with the switch on top and the camera
stayed on! I then took the batteries out from the grip, reloaded the same
batteries and everything is back to normal.

My question is, has this happened to anyone else? Is there perhaps an
inherent problem just starting with the XT?

Eugene Wendland

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PH - 28 Sep 2006 01:44 GMT

Did the green dot in the viewfinder stay lit or did it blink? If it blinked
it could not focus and therefore the shutter would not fire.
As to the camera not shuting off could it have been writing to the card at
the time? This could also be a cause of the shutter not firing.

> Today, something very peculiar happen while shooting with my Canon Rebel
> XT/350D. The camera wouldn't "fire". It was working fine, a few seconds
[quoted text clipped - 8 lines]
>
> Eugene Wendland

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Eugene Wendland - 28 Sep 2006 11:11 GMT

The camera had no problem focusing. Everything, except the shutter release
and the "on-off" switch was working.

> Did the green dot in the viewfinder stay lit or did it blink? If it
> blinked it could not focus and therefore the shutter would not fire.
[quoted text clipped - 13 lines]
>>
>> Eugene Wendland

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John McWilliams - 28 Sep 2006 03:36 GMT

> Today, something very peculiar happen while shooting with my Canon Rebel
> XT/350D. The camera wouldn't "fire". It was working fine, a few seconds
[quoted text clipped - 6 lines]
> My question is, has this happened to anyone else? Is there perhaps an
> inherent problem just starting with the XT?

Yes, it can happen on any model, I believe. Taking the battery out for a
few seconds is the general fix. I think there may be certain combo's of
events that may set that off, happened to me a year ago when I couldn't
get focus and I changed the dial setting in that period.

Signature

John McWilliams

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default - 28 Sep 2006 04:37 GMT

It happened to me before also, just like you describe. Taking out the
battery will fix it. Sometimes reseating the lens fixes it also. I don't
know the sequence of events to force the state to occur. It must be a
firmware bug of some sort.

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Bill - 28 Sep 2006 12:36 GMT

> Today, something very peculiar happen while shooting with my Canon
> Rebel XT/350D. The camera wouldn't "fire". It was working fine, a
[quoted text clipped - 7 lines]
> My question is, has this happened to anyone else? Is there perhaps
> an inherent problem just starting with the XT?

There is no specific problem that I'm aware of for the camera.

I have heard of it happening to various camera models though. The
manufacturers claim it's a processor issue where the camera processor
stops when it receives and attempts to process corrupt data, usually
due to an electrical error. If you switch modes while the camera is
processing another command, it may cause a buffer error and the
processor detects it and shuts down. Static can also cause errors and
is mentioned in the owners manual of some cameras.

I have the XT as well, but I've never experienced it. I wouldn't be
concerned unless it started to happen often, at which point I'd stand
further away from the Tesla coil and see if everything is ok.

:-)

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Rod Williams - 29 Sep 2006 14:55 GMT

I have never had the problem either. Maybe it is running some sort of
Windows in the software and we all know how windows crashes. Just
kidding, well not really.

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Charles Schuler - 30 Sep 2006 00:40 GMT

> Today, something very peculiar happen while shooting with my Canon Rebel
> XT/350D. The camera wouldn't "fire". It was working fine, a few seconds
[quoted text clipped - 3 lines]
> stayed on! I then took the batteries out from the grip, reloaded the same
> batteries and everything is back to normal.

It happens with several Canon DSLR cameras. In most cases, taking out the
battery and immediately putting it back in clears the error.

A fresh battery with clean contacts generally avoids the problem.

It seems to be related to voltage sag. It is more likely to occur with IS
lenses because of their extra current drain. A tired battery or a dirty
battery contact an cause a momentary voltage dip and then some processor
gets scrambled ... speculative, but supported by lots of anecdotal evidence.

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