Canon T90: Cleaning the mirror magnet

[Fisytails]

ive tried for 1:30h and it hasnt moved a single degree...

i think i have to give up for the time being until i find some solution to get grip on the screw

 

[Andreas Thaler]

ive tried for 1:30h and it hasnt moved a single degree...

i think i have to give up for the time being until i find some solution to get grip on the screw

Interestingly, what worked for me was a flathead screwdriver with a shorter blade length.

 

[Andreas Thaler]

The long way to the trigger magnet is to remove the mirror box, which will help you get to know the T90 from the inside.

A shortcut is to loosen the four mirror box screws at the front and the two at the back. Then the mirror box can be pulled forward, and the magnet is accessible.

However, this is experimental, as it can cause problems with the motor clutch.

 

[Fisytails]

Interestingly, what worked for me was a flathead screwdriver with a shorter blade length.

I noticed the same, my main problem is that the screw is so tight that i dont get enough grip on my screwdriver. If i find a solution for that it should work hopefully

The long way to the trigger magnet is to remove the mirror box, which will help you get to know the T90 from the inside.

A shortcut is to loosen the four mirror box screws at the front and the two at the back. Then the mirror box can be pulled forward, and the magnet is accessible.

However, this is experimental, as it can cause problems with the motor clutch.

full disassembly is not possible because i have never really used a soldering iron before and i doubt this is a good first project for that haha
The second option sounds a bit dangerous, ill definitely try to unscrew the magnet more first. But it may be an option eventually if i get nowhere, thanks!

 

[Andreas Thaler]

Another option is to remove the green circuit board with the DC/DC converter (two screws, solder connections), which will give you direct access to the magnet's screw.

It should also be sufficient to loosen just the two screws.

 

[Andreas Thaler]

See PM

 

[Andreas Thaler]

We control the T90, not the other way around

 

[Fisytails]

Another option is to remove the green circuit board with the DC/DC converter (two screws, solder connections), which will give you direct access to the magnet's screw.

It should also be sufficient to loosen just the two screws.

Im trying this right now without soldering, maybe i can get somewhere here thanks again!

See PM

Cant, its locked until i am at 20 posts "due to spam accounts" unfortunately

We control the T90, not the other way around

Haha, i am confident that i can do it eventually

 

[MattKing]

Cant, its locked until i am at 20 posts "due to spam accounts" unfortunately

Welcome to Photrio.
We have done our usual checks, and have manually enabled your access early.
Check your inbox for a related message.

And for anyone else's benefit, prior to doing that, @Andreas Thaler could have started a Private Conversation with you, and you would have been able to respond.

 

[Andreas Thaler]

Welcome to Photrio.
We have done our usual checks, and have manually enabled your access early.
Check your inbox for a related message.

And for anyone else's benefit, prior to doing that, @Andreas Thaler could have started a Private Conversation with you, and you would have been able to respond.

Thanks @MattKing we‘re already in contact.

 

[Fisytails]

Welcome to Photrio.
We have done our usual checks, and have manually enabled your access early.
Check your inbox for a related message.

And for anyone else's benefit, prior to doing that, @Andreas Thaler could have started a Private Conversation with you, and you would have been able to respond.

I didn't understand how the system functioned and only later realized that I could have seen/answered the PM.

Thank you very much for enabling my access anyways!

 

[Fisytails]

It happened!

I was really scared of breaking the hard soldered wires between the board and the flexboard and had to use quite a bit of force to get the screwdriver in there but everything seems ok so far.

In the slot like it belongs!

Using "professional" tools to extract the magnet

it looks... very clean?
I'll do the cleaning next anyways and hope that it fixes the problem.

 

[Andreas Thaler]

Great, congratulations!

So it worked without desoldering just loosening the two screws of the DC/DC converter board.

You've probably seen the washer on the board screw at the top left.

I would thoroughly clean all contact surfaces; the part inside the camera looks a bit cloudy. Try using benzine or isopropanol on a cotton swab, etc.

Can you use a magnifying glass to look at the coil (arrow) to see if there are any wires sticking out from the winding?

 

[Fisytails]

Great, congratulations!

So it worked without desoldering just loosening the two screws of the DC/DC converter board.

Yes, you just have to unscrew the tripod mount and one screw on the flexboard

I would thoroughly clean all contact surfaces; the part inside the camera looks a bit cloudy. Try using benzine or isopropanol on a cotton swab, etc.

Might sound stupid but i used nail polish remover from the 100 Yen store and this is the result:
Video

Can you use a magnifying glass to look at the coil (arrow) to see if there are any wires sticking out from the winding?

I was confused by this too but it was just some piece of plastic stuck to the tape, not the coil itself.

One last question i messed up keeping track of the 6 bottom screws. On your photo on page 1 which way are they aligned?

 

[mshchem]

When I look at the complexity of film cameras from the 80's and 90's its like looking at a moon rocket. The scale of the suppliers that made all the pieces, etc, etc. Simply amazing.

 

[Andreas Thaler]

Might sound stupid but i used nail polish remover from the 100 Yen store and this is the result:
Video

Acetone? The thorough way

You did it, the T90 fires again - fantastic!!!

I was confused by this too but it was just some piece of plastic stuck to the tape, not the coil itself.

Good, thanks.

 

[Andreas Thaler]

From this perspective:

• The silver screw is on the outermost side, top right.
• The longer screw is in the middle, top (hidden).
• The remaining screws should be identical. One is in the middle, bottom (hidden), two are on the outermost side, left, and the last one is underneath the silver screw.

 

[Fisytails]

From this perspective:

• The silver screw is on the outermost side, top right.
• The longer screw is in the middle, top (hidden).
• The remaining screws should be identical. One is in the middle, bottom (hidden), two are on the outermost side, left, and the last one is underneath the silver screw.

Ok perfect, then I assumed correctly!

The girl is alive and well after essentialy being sold for parts

 

[Andreas Thaler]

Ok perfect, then I assumed correctly!

The girl is alive and well after essentialy being sold for parts

 

[Andreas Thaler]

If the sticky shutter occurs (black marks on the rear shutter curtain) there is also a shortcut:

Canon T90: Advanced cleaning of stuck shutter blades

Sticky shutter at EOS Nano Burger gives in „Manage Your EOS Camera’s Sticky Shutter“ https://www.instructables.com/Manage-Your-EOS-Cameras-Sticky-Shutter/ a guide on how to clean stuck shutter blades in a Canon EOS. The reason for the sticking is a small damper under the vertically running...

www.photrio.com

The long (and thorough) way is to disassemble and clean the shutter. Something for a rainy weekend

Have fun with the T90!

 

[Andreas Thaler]

When I look at the complexity of film cameras from the 80's and 90's its like looking at a moon rocket. The scale of the suppliers that made all the pieces, etc, etc. Simply amazing.

A work of art

 

[Fisytails]

If the sticky shutter occurs (black marks on the rear shutter curtain) there is also a shortcut:

Canon T90: Advanced cleaning of stuck shutter blades

Sticky shutter at EOS Nano Burger gives in „Manage Your EOS Camera’s Sticky Shutter“ https://www.instructables.com/Manage-Your-EOS-Cameras-Sticky-Shutter/ a guide on how to clean stuck shutter blades in a Canon EOS. The reason for the sticking is a small damper under the vertically running...

www.photrio.com

The long (and thorough) way is to disassemble and clean the shutter. Something for a rainy weekend

Have fun with the T90!

I hope the shutter stays fine for now but if something happens then ill try the full disasembly, gotta start somewhere haha

Took 32 photos on a walk today, ill see that i can finish the roll tomorrow so i can develop and see if it actually works right, but so far everything seems great!