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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Canon A420 camera
I have a three year old Canon A420 which has been working perfectly
until last week. Now pictures are coming out grossly over-exposed, although they look satisfactory on the LCD screen right up to the point where the release button is pressed. Moving from light to dark subjects, the system adjusts the image on the screen to the changes in light level in a normal manner. Holding the release button half way down 'freezes' a satisfactory picture, but then, after pressing it the rest of the way, the stored result is whited-out. The storage card appears to work normally and an external card reader allows me to store and retrieve other images undamaged. By deliberately choosing dark subject matter or something which needs flash, I can force the correct exposure. The picture then appears to have a fine horizontal line structure imposed on it. I have re-set the camera by removing both power and memory batteriea, and fitted new batteries, but it makes no difference. The camera has not been dropped or exposed to damp, although it was recently subjected to unusually cold conditions whilst taking snow photographs. The rotary function selector switch became very stiff and then eased-up suddenly just when the fault appeared - but I do not see any obvious connection between the two events. Does the switch have multiple contacts? Any other suggestions? -- ~ Adrian Tuddenham ~ (Remove the ".invalid"s and add ".co.uk" to reply) www.poppyrecords.co.uk |
#2
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Canon A420 camera
On Sun, 02 Jan 2011 18:34:00 +0000, Adrian Tuddenham wrote:
I have a three year old Canon A420 which has been working perfectly until last week. Now pictures are coming out grossly over-exposed, although they look satisfactory on the LCD screen right up to the point where the release button is pressed. Moving from light to dark subjects, the system adjusts the image on the screen to the changes in light level in a normal manner. Holding the release button half way down 'freezes' a satisfactory picture, but then, after pressing it the rest of the way, the stored result is whited-out. The storage card appears to work normally and an external card reader allows me to store and retrieve other images undamaged. By deliberately choosing dark subject matter or something which needs flash, I can force the correct exposure. The picture then appears to have a fine horizontal line structure imposed on it. I have re-set the camera by removing both power and memory batteriea, and fitted new batteries, but it makes no difference. The camera has not been dropped or exposed to damp, although it was recently subjected to unusually cold conditions whilst taking snow photographs. The rotary function selector switch became very stiff and then eased-up suddenly just when the fault appeared - but I do not see any obvious connection between the two events. Does the switch have multiple contacts? Any other suggestions? Find someone who can repair it for less than a new camera would cost. -- Live Fast, Die Young and Leave a Pretty Corpse |
#3
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Canon A420 camera
Is this in all modes - Auto, Program, etc?
"Adrian Tuddenham" wrote in message valid.invalid... I have a three year old Canon A420 which has been working perfectly until last week. Now pictures are coming out grossly over-exposed, although they look satisfactory on the LCD screen right up to the point where the release button is pressed. Moving from light to dark subjects, the system adjusts the image on the screen to the changes in light level in a normal manner. Holding the release button half way down 'freezes' a satisfactory picture, but then, after pressing it the rest of the way, the stored result is whited-out. The storage card appears to work normally and an external card reader allows me to store and retrieve other images undamaged. By deliberately choosing dark subject matter or something which needs flash, I can force the correct exposure. The picture then appears to have a fine horizontal line structure imposed on it. I have re-set the camera by removing both power and memory batteriea, and fitted new batteries, but it makes no difference. The camera has not been dropped or exposed to damp, although it was recently subjected to unusually cold conditions whilst taking snow photographs. The rotary function selector switch became very stiff and then eased-up suddenly just when the fault appeared - but I do not see any obvious connection between the two events. Does the switch have multiple contacts? Any other suggestions? -- ~ Adrian Tuddenham ~ (Remove the ".invalid"s and add ".co.uk" to reply) www.poppyrecords.co.uk |
#4
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Canon A420 camera
On Sun, 2 Jan 2011 18:34:00 +0000, lid
(Adrian Tuddenham) wrote: I have a three year old Canon A420 which has been working perfectly until last week. The warranty on the Canon A420 is 3 years. You might check with Canon if it's still under warranty and can be fixed for free. http://www.usa.canon.com/cusa/support/consumer/digital_cameras/powershot_a_series/powershot_a420 http://www.usa.canon.com/cusa/consumer?pageKeyCode=repairLanding -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#5
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Canon A420 camera
On Sun, 02 Jan 2011 14:01:23 -0800, Jeff Liebermann
wrote: On Sun, 2 Jan 2011 18:34:00 +0000, lid (Adrian Tuddenham) wrote: I have a three year old Canon A420 which has been working perfectly until last week. The warranty on the Canon A420 is 3 years. You might check with Canon if it's still under warranty and can be fixed for free. http://www.usa.canon.com/cusa/support/consumer/digital_cameras/powershot_a_series/powershot_a420 http://www.usa.canon.com/cusa/consumer?pageKeyCode=repairLanding Never mind. The original Canon warranty is only 1 year. Some dealers offered 3 year warranties if you buy from them. Sorry for the misinformation. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#6
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Canon A420 camera
John Keiser wrote:
Is this in all modes - Auto, Program, etc? It seems to be. Even using it with the manual exposure at its darkest setting gives over-exposure and a coarse 'raster' effect. I have now noticed that the display has a slight flicker which I don't remember seeing before. -- ~ Adrian Tuddenham ~ (Remove the ".invalid"s and add ".co.uk" to reply) www.poppyrecords.co.uk |
#7
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Canon A420 camera
"Adrian Tuddenham" I have re-set the camera by removing both power and memory batteriea, ** The camera has no memory battery. Any other suggestions? ** Try resetting the camera to all defaults. See P28 of the "Advanced Use Guide". ..... Phil |
#8
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Canon A420 camera
"Adrian Tuddenham" I have now noticed that the display has a slight flicker which I don't remember seeing before. ** The LCD display flickers when pre-viewing a scene lit by fluoro lamps or other light source with mains frequency intensity variations. ..... Phil |
#9
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Canon A420 camera
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#10
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Canon A420 camera
who where wrote:
On Sun, 2 Jan 2011 22:33:02 +0000, lid (Adrian Tuddenham) wrote: John Keiser wrote: Is this in all modes - Auto, Program, etc? It seems to be. Even using it with the manual exposure at its darkest setting gives over-exposure and a coarse 'raster' effect. Possibly the sudden freeing up of the mode switch is the clue. It may be "detached" and stuck in an inappropriate mode. It seems to switch between modes normally, so at least one section of the switch is working - but I agree it does seem the first place to look. I have found two other references on the Web from people who have experienced the same fault - but neither of them appeared to have found a solution. Basically with the cost of these device dropping continuously you will find - as we have - that repair is not a cost-effective alternative to replacement. That said, you have littlle to lose by disassembling it (not trivial) and exploring the internals with special attention to the mode switch. That's going to be my first plan of action. I notice there is a camera repair shop in London which claims to do economically-priced repairs on this model. My problem with buying a new camera is that I may not be able to get a suitable card reader which works with my current Mac OS 8.6 system - and I cannot change the OS because all my business software runs on it. -- ~ Adrian Tuddenham ~ (Remove the ".invalid"s and add ".co.uk" to reply) www.poppyrecords.co.uk |
#11
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Canon A420 camera
Adrian Tuddenham wrote:
My problem with buying a new camera is that I may not be able to get a suitable card reader which works with my current Mac OS 8.6 system - and I cannot change the OS because all my business software runs on it. Can you be more specific? That would place it as a late Power Mac, or an early G3. This is going to become more and more of a problem, as your 10 year old plus computer starts to fail and parts are no longer available. Besides keeping lots of backups, you should investigate either alternate hardware or spares. I was given a beige G3 the other day, cleaned it up and gave it to a friend who uses one for his daily writing. His is starting to fail and now he has a "hot spare". The cost was zero to him, and the owner was glad to see it not end up in the recycle bin. Cost of full refurbishement, which I did not do, would have been a $10 battery, and a new(er) floppy drive. Most just need to be taken apart, cleaned and lubricated, but this one has an electrical problem too, so I would have to get one from another less functional computer. I do this as a "good deed" and I'm sure you could find someone who would be able to help you in your area. Note that there is a program called SheepShaver that will run on a modern Mac and let you boot MacOS in a "virtual machine". You can boot your OS 8.6 under it and run your software. While you are asking around for spares, you may want to ask about that too. Geoff. -- Geoffrey S. Mendelson N3OWJ/4X1GM Those who cannot remember the past are condemned to misquote it. |
#12
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Canon A420 camera
Geoffrey S. Mendelson wrote:
Adrian Tuddenham wrote: My problem with buying a new camera is that I may not be able to get a suitable card reader which works with my current Mac OS 8.6 system - and I cannot change the OS because all my business software runs on it. Can you be more specific? That would place it as a late Power Mac, or an early G3. The system runs on a collection of beige G3s linked by Appletalk. The main business workhorse is ClarisWorks 4. This is going to become more and more of a problem, as your 10 year old plus computer starts to fail and parts are no longer available. Besides keeping lots of backups, you should investigate either alternate hardware or spares. I have a shed full of spares and a lot of backup drives. Cost of full refurbishement, which I did not do, would have been a $10 battery, and a new(er) floppy drive. You can use a stack of much cheaper coin cells if you machine up a brass slug to fill the remaining space in the battery holder. These G3s have ATA drives as well as the original SCSI ones. so replacements are no problem. Note that there is a program called SheepShaver that will run on a modern Mac and let you boot MacOS in a "virtual machine". You can boot your OS 8.6 under it and run your software. I do have an Intel iMac which would take Sheepshaver, but I have been told it still wouldn't allow me too use Pub&Sub, which is what links all my sales software together. No only that, but the iMac won't work on an Appletalk network, in the past I have had to transfer files to it using FTP. It sits in a corner, switched off and effectively useless, while the G3s do most of the work. -- ~ Adrian Tuddenham ~ (Remove the ".invalid"s and add ".co.uk" to reply) www.poppyrecords.co.uk |
#13
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Canon A420 camera
Phil Allison wrote:
"Adrian Tuddenham" I have re-set the camera by removing both power and memory batteriea, ** The camera has no memory battery. This one does, it is a 1220 coin cell in a little plastic clip at the opposite end from the main battery door. Any other suggestions? ** Try resetting the camera to all defaults. Tried it - no difference. -- ~ Adrian Tuddenham ~ (Remove the ".invalid"s and add ".co.uk" to reply) www.poppyrecords.co.uk |
#14
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Canon A420 camera
who where wrote:
On Sun, 2 Jan 2011 22:33:02 +0000, lid (Adrian Tuddenham) wrote: John Keiser wrote: Is this in all modes - Auto, Program, etc? It seems to be. Even using it with the manual exposure at its darkest setting gives over-exposure and a coarse 'raster' effect. Possibly the sudden freeing up of the mode switch is the clue. It may be "detached" and stuck in an inappropriate mode. Basically with the cost of these device dropping continuously you will find - as we have - that repair is not a cost-effective alternative to replacement. That said, you have littlle to lose by disassembling it (not trivial) and exploring the internals with special attention to the mode switch. I've taken it apart and discovered that the mode switch is a robust single pole type with nothing to suggest a fault. The click mechanism is outside the main casing underneath the operating knob and I suspect that it became stiff when some dirt got into that part of it. I have put the camera back together and it operate exactly as before. Next step is to contact the camera repairers in London, when they come back after the Bank Holiday, and ask for an estimate. -- ~ Adrian Tuddenham ~ (Remove the ".invalid"s and add ".co.uk" to reply) www.poppyrecords.co.uk |
#15
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Canon A420 camera
"Adrian Tuddenham" ** The advice for your problem is that the shutter is stuck open causing over exposure on bright subjects. ..... Phil |
#17
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Canon A420 camera
"Adrian Tuddenham" ** The camera has no memory battery. This one does, it is a 1220 coin cell in a little plastic clip at the opposite end from the main battery door. ** Then the camera was made prior to 2006. Musta been old stock when you bought it. .... Phil |
#18
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Canon A420 camera
On Tue, 04 Jan 2011 08:00:03 +0800, who where wrote:
(snip) (We don't read the card to retrieve pics, we use ZB and the USB posts only). posts - ports |
#19
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Canon A420 camera
who where wrote:
On Mon, 3 Jan 2011 11:28:40 +0000, lid (Adrian Tuddenham) wrote: ...I notice there is a camera repair shop in London which claims to do economically-priced repairs on this model. Good luck with that (sincerely). You may also be able to locate a pre-loved A420/430 for the same sort of cost. I'll let you know how I get on. My problem with buying a new camera is that I may not be able to get a suitable card reader which works with my current Mac OS 8.6 system - and I cannot change the OS because all my business software runs on it. SD/MMC? Close to standard for very many cameras. We have a couple of Canons here (A200 and A540), chosen for quick point-n-shoot duty. They were selected because of key features on my shopping list - AA batteries, macro, USB interfacing, etc etc - if you start the hunt for a replacement with a "must-have" feature list you'll surely have some success. (We don't read the card to retrieve pics, we use ZB and the USB ports only). That was a problem I had with the A420, the Mac could see the USB port on the camera but the camera wouldn't allow access to the data without its own software running on the Mac OS - and the drivers supplied by Canon didn't work on OS 8.6 I solved the problem with a cheap USB card reader. A friend has recently bought a card reader to use with her Sony camera on Mac OS 8.6 and discovered theat it won't work because they now put the reader software in the computer, not in the reader and ...guess what... the card software won't run on OS 8.6 ! -- ~ Adrian Tuddenham ~ (Remove the ".invalid"s and add ".co.uk" to reply) www.poppyrecords.co.uk |
#20
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Canon A420 camera
Adrian Tuddenham wrote:
A friend has recently bought a card reader to use with her Sony camera on Mac OS 8.6 and discovered theat it won't work because they now put the reader software in the computer, not in the reader and ...guess what... the card software won't run on OS 8.6 ! This may be of interest to you: http://support.apple.com/kb/DL1238?viewlocale=en_US It was the last USB update that will run on MacOS 8.6 and it states what will and will not work. Geoff. -- Geoffrey S. Mendelson N3OWJ/4X1GM Those who cannot remember the past are condemned to misquote it. |
#21
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Canon A420 camera
On Tue, 04 Jan 2011 10:41:53 +1100, Phil Allison wrote:
"Adrian Tuddenham" ** The advice for your problem is that the shutter is stuck open causing over exposure on bright subjects. Only if it had a shutter. -- Live Fast, Die Young and Leave a Pretty Corpse |
#22
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Canon A420 camera
Geoffrey S. Mendelson wrote:
Adrian Tuddenham wrote: A friend has recently bought a card reader to use with her Sony camera on Mac OS 8.6 and discovered theat it won't work because they now put the reader software in the computer, not in the reader and ...guess what... the card software won't run on OS 8.6 ! This may be of interest to you: http://support.apple.com/kb/DL1238?viewlocale=en_US It was the last USB update that will run on MacOS 8.6 and it states what will and will not work. Thanks, I have installed it on my machine and will send a copy to the friend who was having trouble with the card reader. I suspect the problem will still be that her card reader needs its own software in the computer. -- ~ Adrian Tuddenham ~ (Remove the ".invalid"s and add ".co.uk" to reply) www.poppyrecords.co.uk |
#23
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Canon A420 camera
Phil Allison wrote:
"Adrian Tuddenham" ** The camera has no memory battery. This one does, it is a 1220 coin cell in a little plastic clip at the opposite end from the main battery door. ** Then the camera was made prior to 2006. Musta been old stock when you bought it. It was - but the price was right. -- ~ Adrian Tuddenham ~ (Remove the ".invalid"s and add ".co.uk" to reply) www.poppyrecords.co.uk |
#24
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Canon A420 camera
Phil Allison wrote:
"Adrian Tuddenham" ** The advice for your problem is that the shutter is stuck open causing over exposure on bright subjects. That seems to be the most likely cause. I have found a firm that will repair it (with a guarantee) for £72, so that is my least-bad option. -- ~ Adrian Tuddenham ~ (Remove the ".invalid"s and add ".co.uk" to reply) www.poppyrecords.co.uk |
#25
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Canon A420 camera
"Meathead Blowhard" ** The advice for your problem is that the shutter is stuck open causing over exposure on bright subjects. Only if it had a shutter. ** **** off - IMBECILE !!!!!!!!!! |
#26
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Canon A420 camera
"Adrian Tuddenham" Phil Allison ** The camera has no memory battery. This one does, it is a 1220 coin cell in a little plastic clip at the opposite end from the main battery door. ** Then the camera was made prior to 2006. Musta been old stock when you bought it. It was - but the price was right. ** So it is NOT a 3 year old camera at all but may be up to 13 years old. Just that YOU have owned it for 3 years. ..... Phil |
#27
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Canon A420 camera
"Adrian Tuddenham" ** The advice for your problem is that the shutter is stuck open causing over exposure on bright subjects. That seems to be the most likely cause. I have found a firm that will repair it (with a guarantee) for £72, so that is my least-bad option. ** Seeing as cold temp caused the problem - try warming the camera ( to say 40C with warm air ) and operating the shutter over and over and tapping on the lens assembly. Cost you nothing and you got nothing to lose. ...... Phil |
#28
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Canon A420 camera
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#29
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Canon A420 camera
On Wed, 05 Jan 2011 13:56:46 +1100, Phil Allison wrote:
"Meathead Blowhard" ** The advice for your problem is that the shutter is stuck open causing over exposure on bright subjects. Only if it had a shutter. ** **** off - IMBECILE !!!!!!!!!! Is that OOOPSIE! in Phil-Speak? -- Live Fast, Die Young and Leave a Pretty Corpse |
#30
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Canon A420 camera
Geo wrote:
On Tue, 4 Jan 2011 15:28:03 +0000, lid (Adrian Tuddenham) wrote: Phil Allison wrote: "Adrian Tuddenham" ** The advice for your problem is that the shutter is stuck open causing over exposure on bright subjects. That seems to be the most likely cause. I have found a firm that will repair it (with a guarantee) for £72, so that is my least-bad option. Have you looked at the price and spec of a Canon replacement? e.g:- http://www.canon.co.uk/For_Home/Prod...tal_Camera/Pow erShot/PowerShot_A495/ That does look pretty good as long as I can get the pictures out of it. It says it will take SD cards, so my external reader might work with it. (I seem to remember some memory card size limitation on either the reader or the camera, can't remember which.) -- ~ Adrian Tuddenham ~ (Remove the ".invalid"s and add ".co.uk" to reply) www.poppyrecords.co.uk |
#31
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Canon A420 camera
"Geo" Have you looked at the price and spec of a Canon replacement? e.g:- http://www.canon.co.uk/For_Home/Product_Finder/Cameras/Digital_Camera/PowerShot/PowerShot_A495/ ** The A495 is no replacement for the A420 - since it completely lacks an optical viewfinder. The A420 has one with inbuilt zoom that actually tracks the main lens - without an optical viewfinder, such cameras become near useless in daylight because the LCD screen is washed out. I have owned an A430 ( near identical to the A420 ) for the last 4 years. .... Phil |
#32
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Canon A420 camera
On 2 ene, 19:34, (Adrian
Tuddenham) wrote: I have a three year old Canon A420 which has been working perfectly until last week. *Now pictures are coming out grossly over-exposed, although they look satisfactory on the LCD screen right up to the point where the release button is pressed. * Moving from light to dark subjects, the system adjusts the image on the screen to the changes in light level in a normal manner. *Holding the release button half way down 'freezes' a satisfactory picture, but then, after pressing it the rest of the way, the stored result is whited-out. By deliberately choosing dark subject matter or something which needs flash, I can force the correct exposure. *The picture then appears to have a fine horizontal line structure imposed on it. Given all your described sympthoms I would say it is the CCD sensor starting to fail. It is showing some dark rows across the pictures, typical of problems with these sensors. These dark rows make the camera think the picture is darker than it is and increases exposure to compensate. When you see the picture on its LCD live it is not analyzing all the rows but a small fraction and these failing rows have no impact at all, so it appears to work properly. But when you take the photo it processes all the information. I think the sensor will have to be replaced (if worth) but meanwhile you can lower the exposure manually as you did as a workaround. Consider also that overexposed photos may be corrected to some degree with an editing program that can correct brightness/contrast. I get quite good results with MS Office photo editor, my camera has a tendency to take pictures too dark mainly under artificial light and I fix some of them before printing. Sorry if it sounds like bad news. |
#33
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Canon A420 camera
"Jeroni Paul is a TROLL" Given all your described sympthoms I would say it is the CCD sensor starting to fail. ** Shame how it works fine when viewing on the LCD display. ..... Phil |
#34
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Canon A420 camera
Jeroni Paul wrote:
On 2 ene, 19:34, (Adrian Tuddenham) wrote: I have a three year old Canon A420 which has been working perfectly until last week. *Now pictures are coming out grossly over-exposed, although they look satisfactory on the LCD screen right up to the point where the release button is pressed. * Moving from light to dark subjects, the system adjusts the image on the screen to the changes in light level in a normal manner. *Holding the release button half way down 'freezes' a satisfactory picture, but then, after pressing it the rest of the way, the stored result is whited-out. By deliberately choosing dark subject matter or something which needs flash, I can force the correct exposure. *The picture then appears to have a fine horizontal line structure imposed on it. Given all your described sympthoms I would say it is the CCD sensor starting to fail. It is showing some dark rows across the pictures, typical of problems with these sensors. These dark rows make the camera think the picture is darker than it is and increases exposure to compensate. When you see the picture on its LCD live it is not analyzing all the rows but a small fraction and these failing rows have no impact at all, so it appears to work properly. But when you take the photo it processes all the information. That sounds quite possible - especially as the sensor had been exposed to very cold conditions for the first time and I now discover that sensor faults were not unknown in early versions of this model. I think the sensor will have to be replaced (if worth) but meanwhile you can lower the exposure manually as you did as a workaround. I've sent it away for repair and the quote was for a 'replacement lens unit' (which presumably includes the sensor). Consider also that overexposed photos may be corrected to some degree with an editing program that can correct brightness/contrast. I get quite good results with MS Office photo editor, my camera has a tendency to take pictures too dark mainly under artificial light and I fix some of them before printing. Most pictures were so severely 'crushed' that no recovery was possible - I did manage to use one but it was a struggle. -- ~ Adrian Tuddenham ~ (Remove the ".invalid"s and add ".co.uk" to reply) www.poppyrecords.co.uk |
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