Help with replacing \"the Fuse\" for powershot G1

[Shekhar]

Can some one post -a step by step, procedure (with pictures and/or diagrams please) to replace the fuse.
Where can I buy the fuse -radioshack?
Please reply

[civi]

I have a paper copy of the disappered thread

The link provided by user proflex:

http://members.optusnet.com.au/~jono/PowerInterfacePCB.JPG

Another link provided by user carlstev:

http://www.dragon-sys.com/Canon_G1/

I hope this can help you.

[proflex]

Hey Civi, heres a copy of the first post I did. Hope this pastes ok.


Re: Canon G1-dead? No More

One of my best mates has a Canon G1 and it died on him when it was out of warranty.

I'm an electronic engineer and I design surface mount circuits, so I knew my ****. I would have next to no idea where the problem was, and with no circuits, its like a needle in a haystack. But I would have a better clue than the average joe, so this is what I found.

To cut a long story short we fixed it. It was a 3.15A surface mount fuse (little orange package) on the power reg/memory card PCB.

When you test across a blown fuse, your looking for a high resistance, I was suprised when it was about 80Kohms, normally it would be an open circuit. If the fuse was fine, you would have read a low resistance >1ohm.

I ordered in a 3A 24V max 1206 SM fuse (for AUS$0.80)(Only one off our supplier that I could get) , and replaced the blown fuse.

We joked that we could take a picture of what we had done, but the camera was stuffed and in pieces But for your info, I borrowed my boss's camera and took these pictures for you of the power PCB.

http://members.optusnet.com.au/~jono/PowerInterfacePCB.JPG

You wouldn't pull apart the camera unless you have have the right tools and would do it no different to the service guys themselves. I would be so pissed of if someone tried to bring me a camera they had put together wrong, and said they hadn't pulled it apart and tried to fix it.

It was highly time consumming fix it job, the circuits are so well packed together, attached with flexible PCBs(with clamp locks you have to undo) and powerleads with small clip locks. Use tweesers and love.

Tips if you try it (at your own risk, but a well educated risk is much better)
- Keep a track of the length and thread type of the screws you pull out.
- Try not to bend the flexible PCBs to much, as they do break. Support them with anything a the right height.
- Make sure you treat it with care, use the right tools and static protection.
- Don't not take away a box of spare parts when you are done. If you have the tools, it just saved my buddy over AUS$300 in a service.

Its not Canons fault the fuse is designed to blow, its designed to protect the circuit and it did its job well. We now have a working camera after 4hours labour and organisation.

[Shekhar]

CiVi & Proflex,
Thanks a lot!
At present my camera is with Canon @ Chicago service center, and I am waiting for their diagnosis (!). I think I have a strong case for Canon to repair my camera without charging me. I will update the "preceedings" in this forum.
I am still wondering what could have happened to the extremely long and informative "dead G1" thread.
Thanks again

[Shekhar]

I have posted the lastest re my dead G1:

http://photography-on-the.net/forum/showthread.php?t=19733

Thankyou all
Shekhar

[brohrbach]

I'm curious whether, given the complexity of the repair, anyone looked into repacing the entire board? Perhaps its no longer available or cost prohabitive, just thought I would ask.

[DavidB]

I'm curious whether, given the complexity of the repair, anyone looked into repacing the entire board? Perhaps its no longer available or cost prohabitive, just thought I would ask.The fuse in question has the Canon part # CY4-6069-000.
Ring up Canon, ask for Spare Parts, and find out how much it costs.
Obviously you need the right equipment and skills to install it though.

The DC/DC converter PCB (the board in question) is part # CM1-1076-000.
Again, it should be easy to find a price. In Australia Canon Spare Parts will do credit card orders by phone, with domestic shipping for free.

Be aware though that the cost of parts for older cameras tends to be higher than for newer ones. Whether the cost goes up for older parts or simply that the cost goes down for newer parts is something I'm not sure...
But presumably the old parts become unavailable at some point: if you're thinking about this path I would make your phone calls to Canon sooner rather than later!

[brohrbach]

Thanks for your reply. Assuming the price is reasonable the only remaining issue is whether the boards if available are also be fitted with the same vintage fuses that seem to creating the problem, in which case its not a very prudent path.That's not a question for you just an observation.

[etaf]

canon parts list - may be useful
http://www.micro-tools.com/pdf/Canon/