Tag: A

This is what it looks like externally, looks fine, but as this post goes on, you will notice a very marked deterioration in quality. It’s a horror story of battery acid contamination.

This unit is part of a bundle that was donated to me by my good friend Jon, see here: Cameras…i need more!

It was part of a Canon AE1 combo, the Camera i have previously posted about here: Canon AE1 35mm SLR, however the batteries within it had been left for such a long time that they had started to dissolve into the unit, leaving quite a restoration project behind. Here’s some history about this unit:

The Canon Power Winder A was originally introduced with the Canon AE-1 camera in 1975 but it also can be used with all the A series models (in fact, it is applicable to use the Winder A with the professional class Canon F-1(n) system SLR camera but without power rewind feature). It is an automatic film winder which greatly increases the automation and mobility of these manual focus cameras. Its exceptional versatility, due to its compact design provided by the principal control circuit built into the electronic circuitry with most of the electronic models such as AE-1, A-1 or AE-1 Program etc, and allows it to be attached to any models mentioned earlier and provides for its use without any special adjustments. 

Winding Speed: Approximately 0.5 seconds.
Operation: When the shutter button on the AE-1 is pressed, the winder will function. 
Shutter Speed Coupling Range: 1/50 to 1/1000 second for continuous photography. “B”, or 2 to 1/1000 second for single frame photography. (When the winder is set at “B”, AE photography cannot be performed).
Film Counting: Is performed by the frame counter on the AE-1.
Automatic Cut off Circuit: When the film roll is completely wound up or if the batteries should run out, the winder will automatically stop and the warning lamp (LED) will light up.
Power Source: Use 4 size AA batteries. (In normal temperatures they can take more than twenty rolls of 36-exposure film).
Attachment: Take off the winder coupler cover on the bottom of the camera, and mount the power winder using the tripod socket.
Size: 141 x 42 x 34mm (5-9/16″ x 1-5/8″ x 1-5/16″) 
Weight: 3009 (including batteries) (10.9/16 ozs.)

Mir.com

I already have one of these winders on my A1 that I am currently repairing, however that’s away in storage at the moment until I get get my workspace back up and running when we eventually move home.

Im aware that these winders can take a max of two exposures per second if the lighting and conditions are right, meaning you could crack out a 36 exposure roll of film in under 20 seconds! They don’t do auto rewind either, you still have to do it manually, it would be a couple of years yet before that option became available. The red light on the case indicates one of two things, the battery is low, or the end of the roll has been reached, time to rewind!

They are quite reasonably priced if I wanted to buy one, but why would I do that? The purpose of this site is to repair and recycle, so that’s what I will attempt to do. It will be quite a task with this one I think.

Assessment:

As stated above, and from the outside, all looks well.

However there are a couple of giveaways that alert you to the immediate issue. Firstly there is an aroma, a kind of metallic musty smell that instantly alerts you to “Corrosion”. Secondly near the switch there are some “blue” granular stains that confirm corrosion.

It’s pointless even putting batteries in here yet as they will not work, the damage is too extensive for the batteries to work. To be honest we now need to do a good clean and decontamination before we can even start to look at the extent of the contamination.

Repair:

First we have no choice but to get rid of the corrosion, this will involve brushes, a pencil grinder, and copious amounts of isopropyl alcohol. Let’s get started.

I attack the contact end of the winder with a sonic brush and some IPA. After about 10 minutes and multiple applications, using a small scraping tool i was able to remove the corrosion that had started to eat away at the chrome on the contacts, a small rub with some fine sanding paper restored the metal as best I could. I’m not going too over the top here as the corrosion could have well gone past this point into the internal workings, I’ll tidy up once I can get it working as it should.

The battery compartment was cleaned using a similar process. However the contact end that used to have springs mounted for the batteries, have all rotted and the springs have had to be removed. I will replace the springs later, it’s not required for testing purposes just yet. All this contamination and blue staining has to be removed completely, if you leave contamination behind, it can start to attack the unit again at a later date, take your time and ensure you get as much off as you can. Clean, clean and clean again. It’s a boring part of the process but essential for long term results.

With everything cleaned and left to dry, I put some power across the winder power contacts and nothing happens. No noise, not any sign of clicking or of any movement at all. Just as previously feared i think the corrosion has gone further. Let’s get it opened.

And as expected the corrosion has made its way inside, the picture above shows a wire at the contact point rotted due to corrosion, in fact the second wire fell off just after removal, the contamination has eaten the cables and is rotting the connections. The good news is that it seems that the issue hasn’t gone beyond these contacts.

I’ve now cleaned and polished the contacts at the rear in preparation for being re soldered, the issue here is that I may have to extend the cables slightly as they are quite short. This may aid my testing of the unit prior to reassembly, let’s wait and see.

I have now soldered both contacts back into position, without any extra wire, hell, it was really fiddly and I doubt it would be able to be opened again without these wires being extended a bit further. I have also thoroughly cleaned throughout the internal workings removing all signs of contamination. I have reassembled the unit and it now sits in one piece. I have taken a dentist tool to further scrape down the contact point within the battery barrel area.

Using a little wire wool and IPA to clean the area I now have two good points of contact. Using the multimeter confirms we have continuity over the contacts that we didn’t have previously.

Reading the section above, you will remember that I had to remove the two springs on the battery case as they had totally corroded and broken away. I have some new ones but they are in storage, so for now I will just have to compromise until I can get to the new ones and solder them in place. Here I just obtained an old spring from a waste metal box, split it in two, added a small washer one end for the positive contact and just left the other as it was. Both springs were put in place, just being held there by the four AA batteries. As I stated this is purely for testing purposes and will be corrected once I have confirmed the unit works.

The battery holder was attached and then switched on. Nothing. Then I remembered I have to simulate the signal from the camera and this can be done by putting a metal short across the two raised pins at the power switch end. This worked, and the motor did its quick burst as expected. See the small video below.

I’m pleased with this, as all the work I have done has been worthwhile. I just need to get the new springs soldered in place, give the whole unit a thorough final clean, ensure the leatherette that was removed is stuck back down and that the on off indicator is stuck back into place. And then we can put it onto the Canon AE1 to see if it works as it should.

Today I have taken out the battery spring connector and I am about to put the new spring contacts in place. I’ve found even more corrosion behind this plate so this will need to be cleaned before reassembly.

I’ve now fixed the new permanent springs in place, they wouldn’t solder so I’ve had to use a combination of using the old clips that were originally there and weaving the spring though the holes where some clips used to be but had corroded away. Either way it has worked well and both springs are quite solid, and don’t look out of place at all, they probably look better than the originals.

With the battery pack contamination removed I can now reinstall the battery contact back into place.

I know that the pack works, and now the final touches have been added, this winder is now back into a good working order, and fit to go back to work doing what it was originally designed to do.

Result:

This is an item you can readily buy on the auction sites at a very reasonable, some would say even very cheap price.

Is it worth the repair you say? Well yes, it is. The trouble is, it is so easy to throw stuff away these days, that in reality, can be given an extended life and purpose for pretty much no cost apart from your time and patience. On top of that, getting these items apart and reassembling them is a great learning circle, and you can never stop Learning. You are preserving the past, and that’s always a good thing.

As you can see above in this small video I have taken today, here I have my Canon AT-1 with the winder attached, doing what it is meant to do and sounding so retro with that motorised winding sound. Don’t you just love it? I most certainly do.

Thanks for passing by. It’s always very much appreciated.