Hasselblad Repairs and Cleaning Tech

Function and Repair of Hasselblad Film Backs (A12 and others) – By Arild Edvard Båsmo

Function and Repair of Hasselblad Film Backs (A12 and others) - By Arild Edvard Båsmo

In case you are studying this, you may need a magazine with some issues. This piece is written that will help you. I discovered there to be little or no documentation on the restore of these, however I feel these these magazines, regardless of their complexity, are fairly repairable by a barely useful individual. This isn’t written by knowledgeable restore individual, however by an novice college college students with some expertise doing restore on these, in addition to on different digital camera gear.

Earlier than this, nevertheless, I have to inform you the way to determine which journal you might have.

The Early Journal 12

There appear to be rather a lot of confusion as to which magazines are which. In essence there are two primary varieties, these are additionally the most typical one.

The oldest one is definitely not referred to as A12, it was simply referred to as Journal 12 and was produced till the late 1960s. This older fashion is so much easier mechanically and lacks some of the options of the later movie backs, however is not any worse. The simplest method of recognising one, is to search for the peephole. As you possibly can see within the image under there’s a peephole within the center, via which you’ll be able to see the movie. To start out a movie on this again, you don’t have to align any arrows or something, you merely be certain that the movie is rolled onto the receiving spool, you then shut the journal, open the peephole and flip the crank till you see a “1” seem on the backing paper of the movie. Earlier than you see that, you will notice arrows, and in all probability the identify of the movie. Remember that “1” may look extra like only a line. Whenever you get there, and you cease with the peephole proper over “1”, you flip the crank backwards, and you’ll discover that the counter on the aspect of the movie again, will flip to “1”. Now you’re able to shoot.

This model is mechanically comparatively easy and ought to have fewer issues. I’ll thus not cowl any restore on it. Nevertheless, in case you are having issues with this again, you may nonetheless discover some of the knowledge under helpful, however issues won’t look precisely the identical.

The A12 Film Again

The opposite, extra mechanically complicated again, is the later A12, constructed from round 1970. This has a mechanism that is aware of how far down the movie you flip, and then stops you once you get to the primary body (offered you align the arrows). The simplest solution to know if that is the model you will have, is to verify if there’s a peephole on the again. If there’s none, and you can’t open it simply like on the image above (don’t pull arduous, it ought to pop open simply if it’s there), then you might have the newer model. One other approach of telling, is to look inside. Taking out the movie holder, you’ll discover that there are two pins contained in the journal, not only one, like within the older mannequin. The pink (not very round) circle within the image under exhibits the second pin of the newer mannequin. This pin principally permits the digital camera again to know when the movie holder is inserted into the again.I’ll come again to how this works in additional element later.

With this later journal, you merely load the movie, lining the massive arrow on the movie up with the little purple arrow on the movie holder. You then shut the journal and flip the crank till it stops and the counter involves 1. You at the moment are able to shoot.

Repairs on the A12

As a result of of this added mechanism, which I frankly want they hadn’t carried out, there’s a entire host of new issues that would go incorrect. I lately purchased one of these, and even from the surface you may inform that one thing was flawed.

If the pin that I talked about earlier has no rigidity, which means that it simply flops round freely, or whether it is utterly caught (discover that the opposite pin ought to be inflexible), then your again is in want of restore. You possibly can ship it to your favorite restore individual, however they might in all probability cost you round 80 kilos for an overhaul, and these can, in the event you’re good on the eBay Recreation, be had for round 100 kilos. Regardless that these are very intelligent mechanisms, they’re very repairable. When you’ve got a number of small screwdrivers, tons of endurance and a diagram of the again (included under), you must be capable of take it aside and piece it again collectively.

Firstly, I think about one of the most typical issues to be a damaged spring. One spring particularly. Most springs tire over time. When you’ve got a again that has been used closely because the seventies, there’s a good probability your spring may need misplaced some of it springiness. That is essential for the mechanism, which you may see in a minute.

First, to open the again, take out the movie holder and the darkish slide. Then, utilizing a screwdriver or a big needle, peel away sufficient of the pretend leather-based to disclose the screws (marked in purple on the image under).

You should use the crank as a deal with to tug it off. Don’t use a lot pressure, it ought to pop off in case you wiggle it. It is best to now see one thing like this:

If issues don’t look fairly like this, then the following pointers won’t apply to you. On the correct you’ve gotten the massive body counter wheel. On the highest proper, the little pink/white flag that allows you to know should you’re able to shoot or not. Within the center, there’s the crank to advance the movie if you load it and the massive wheel on prime connecting to the digital camera. On the left is the mechanism for preserving stated system beneath pressure.

The Advance Gear Meeting Engagement Mechanism

Within the under picture, the weakest level, for my part, is the purple circled mechanism. That is the opposite finish of the pin I used to be speaking about earlier. If you insert the movie spool, it pushes that pin into the cylinder marked with a purple line. That little lever within the cylinder is spring loaded by the spring within the pink circle. The aim of this mechanism, is to interact the group of gears hiding beneath the massive washer, connecting the counter wheel and the turning mechanism, every time the movie holder is within the journal.

The primary drawback about this, is that the spring must be fairly robust to tug the mechanism into gear. If the spring weakens over time, then the gears won’t interact correctly and the entire again turns into ineffective. In case you are fortunate, the spring may simply have hopped off when somebody dropped it and it’s laying round in there. Utilizing a needle or tweezers, reattach the spring as proven within the image. In my case, the spring was lacking: What adopted was my journey into hand making springs from previous pens, grasp in there, I’ll get there.

If, after attaching your recovered spring the counter wheel ought to flip slowly once you flip the crank cog (the one with a big washer), attempt to insert a needle within the little gap that the spring attaches to within the purple circle, by the lever and pull it to the left (when you have it in the identical orientation as the image) till you are feeling it cease. Now, nonetheless holding the strain, flip the crank cog and see if the counting wheel turns. If it does, it means the remaining of the mechanism works and it’s your spring that has worn out and isn’t robust sufficient. To repair this, proceed studying, you want a brand new spring. If it doesn’t, then you definitely in all probability have one other drawback. Proceed studying.

Making Your Personal Spring

In case your spring is lacking or damaged, you may want to exchange it. I’ve scoured the web, and until you have an interest in shopping for a thousand of them, you’re in all probability out of luck (the half quantity is 814 852 – Hasselblad A12 Journal, if somebody discover an sufficient alternative, do inform me!). Nevertheless, with some apply and a bunch of spring loaded ballpoint pens I used to be capable of make my very own. The unique, which may be seen within the diagram included on the backside, spring has three coils (I don’t have a background in machines and such, don’t decide on me for my poor use of terminology) and is about three mm hook to hook. There isn’t any particular approach of making an ideal spring. Nevertheless, I may give you some ideas.

I used a 1.25 mm thick needle (principally a thick needle), two pairs of pliers and a wire slicing plier. Then you definitely want some respectable wire to make it out of. I salvaged some springs from Pilot spring loaded ballpoint pens. These are barely thinner than the unique, however we’re compensating by making the spring with extra coils and a smaller diameter. With one set of pliers, clamp the wire and the needle collectively, then seize the opposite and begin wrapping the wire round as shut collectively as you possibly can. If you get four or 5 turns across the needle, cease and take it off. You need to wind the string shut collectively, in order that there isn’t any hole between every coil. You now should make hooks on every finish. Ensure you don’t uncoil your shiny new spring within the course of. You need to find yourself with three-four turns. A warning: That is troublesome and fiddly work. Use small pliers and give your self lots of makes an attempt. Don’t assume you’ll do it in a single attempt, it took me 10. Simply take into consideration the cash you’re saving.

Once you lastly handle to make a spring that you simply assume matches, attempt it. Slot it into the opening and across the lever, then attempt to push the pin contained in the again all the best way in, or put the movie holder again in. Doing this, you must see the gear meeting situated underneath the massive washer transfer. Whereas nonetheless holding the pin down, attempt to flip the gears utilizing the cog that the washer sits on. You must see the counting wheel flip. If it doesn’t, you in all probability haven’t made a robust sufficient spring. Attempt once more, maybe with wire from a special pen, or attempt making it shorter. It’d simply be that it’s too lengthy and it’s essential to make it even shorter.

One other associated drawback, is the weaker spring (marked in inexperienced) working towards this purple spring. Verify if it’s the place it’s on the image above. If it isn’t, see if it’s in there, typically it pops off and you will want to reattach it to the highest of the screw attaching the lever to the physique. If this spring is misplaced or damaged, repeat the above, making an extended, weaker spring.

The Counting Wheel Cease Mechanism

Marked in blue, you possibly can see a small catch. It’s function is to catch the counting wheel, and thus cease the entire mechanism, when you will have completed the roll of movie. It ought to catch should you insert the movie holder, then flip the wheel till 7 involves the little catch. You need to see the catch transfer into the slot, stopping the wheel from turning the opposite method. The issue about this entire mechanism, is that the spring mentioned earlier needs to be robust sufficient to push this catch into the notch. You’ll be able to attempt giving the totally different elements a bit of bit of oil (stitching machine oil is sweet), however you may, like me, discover that my hand-crafted spring is simply not robust sufficient to push towards. To repair this, repeat the above talked about spring making course of, however with a stronger spring (tighter, shorter and perhaps with an additional coil, or thicker wire).

The Counting Wheel not Spinning Again

You may discover that your counting wheel doesn’t spin again when it ought to. This could possibly be for a quantity of causes, however the best repair, is to not screw the highest plate (the black plate over the gears) so arduous, this may relieve some strain on the counting wheel and let it spin freely. If this doesn’t work, then oil is vital. Attempt to not splash it in all places. Dipping a needle in oil and pushing it towards the half you need to oil is sweet follow. Stitching machine oil must be superb. Oil the massive gear under the counting disc, then give the sting of the disk itself some oil, it is perhaps sticking to the highest plate.

If the above didn’t assist, you’ll have to exchange the spring that provides rigidity to the counting disc. This can be a bigger process. I like to recommend the YouTube channel “Fix Old Cameras” and their video on the A12 again for an extra strip down of it (hyperlink on the backside). Be happy to get in contact with me for those who assume which may assist you to.

The Purple/White Flag not Working

In some instances the pink/white flag won’t work. That is situated on the prime proper of the photographs above. Beneath it, there’s a spring that coils across the base. Normally it’s only a matter of relocating this spring, as it’s fairly simply dislocated. Use a needle to push it into the appropriate orientation. That is additionally talked about within the Repair Previous Cameras video talked about.

For Different Issues and Last Phrases

My movie again got here reassembled by an novice and had a number of issues in addition to those talked about above. If none of these issues apply to you, and you’re not fairly positive what your drawback is, a correct reassembly might assist you. Repair Previous Digital camera has a tear down and reassembly of the A12 Film Again. It may be discovered right here.

Following this, some points is perhaps fastened. An important one is the right tensioning of the return wheel on the highest left of the picture (in orange), and of the right orientation of the canine bone gear (watch the video).
The diagram I’ve talked about a couple of occasions might be discovered right here.

It’s a lengthy doc, you’ll have to scroll down till you discover the related diagram of what you’re after. Web page 31 is probably the most helpful for the work talked about above.

For extra info and recommendations on Hasselblad movie backs, in addition to rather more in-depth historical past, Emulsive.org has a superb article on the subject. You’ll find that right here.

This little piece has hopefully helped your repairing your personal digital camera. I discover repairing my very own digital camera gear very satisfying, in addition to being an enormous cash saver. This stuff are usually not as troublesome as many individuals make it out to be. Be affected person, word the place issues are, type your screws and, in case you really feel such as you gained’t keep in mind the place issues go, take footage as you go.

Thanks for studying, I hope you discovered one thing or that it helped you restore your personal movie again.

You’ll find my occasional Instagram submit @arilbaas

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