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The impure power indulges. Canon EF 75-300mm f/4-5.6 III USM Lens Repair

Evil power is indulging. Repair lens Canon EF 75-300mm f/4-5.6 III USM lens.
The focus works crookedly. Prior to that, I visited several service centers, the effect was not eliminated.
And what kind of services would you allow in our city? We are the only one authorized for Canon devices!
Moreover, I bought in our company store. I absolutely do not understand the logic of the comrade. I bought it and why I didn't come to the service with a defect.
In the price tag of the service, such an item – if it was repaired on the side, it cheerfully doubles.
I tried this point for a long time with the leadership.
Since there are two problems at once, which was originally, what the past repairers did if they could not eliminate the defect. More than once I met the units outwardly everything is fine, inside the “constructor” was thrown into a heap, just to close the case. I show the client this case, he immediately runs over with “unwashed wheels”. And it turns out that I am to blame for this “set of parts”, not like a former friend who tore everything and threw it into the case.
Prepared the tool, start repairs.
 Evil power is indulging. Lens repair Canon EF 75-300mm f/4-5.6 III USM Evil power is playing around. Canon EF 75 Lens Repair -300mm f/4-5.6 III USM And what was so wonderful on my table!
Evil power is indulging. Lens repair Canon EF 75-300mm f/4-5.6 III USM Evil power is indulging. Lens repair Canon EF 75-300mm f/4-5.6 III USM Evil power is playing around. Repair. lens Canon EF 75-300mm f/4-5.6 III USM last comrade, everything was sorted out very carefully. It's even worse.
I attach the lens to the carcass and start driving through the tests.
Autofocus does not work, in manual mode, almost everything is fine, but there are some misunderstandings. It is unlikely, whether the control board, most likely the motor of the autofocus drive or the gears of the reducer.
That means I will have a hard time.
I take off the metal bayonet. And also the intermediate barrel-barrel. Control board, disconnecting the loops.
 Evil power indulges. Repair of the lens Canon EF 75-300mm f/4-5.6 III USM Evil power is playing around. Canon EF 75 lens repair -300mm f/4-5.6 III USM Another plastic ring and remove the board.
Evil power is indulging. Lens repair Canon EF 75-300mm f/4-5.6 III USM  Unclean power indulges. Repair of lens Canon EF 75-300mm f/4-5.6 III USM Here is the drive reducer and ultrasonic motor.
Evil power is playing around. Canon EF 75 lens repair -300mm f/4-5.6 III USM The reducer is normal, the gears are clean.
< a href = "https://usamodelkina.ru/uploads/posts/2021-07/1626964970_p1010014.jpg" rel = "prettyPhoto">Evil power is indulging. Lens repair Canon EF 75-300mm f/4-5.6 III USM  Unclean power indulges. Repair of lens Canon EF 75-300mm f/4-5.6 III USM Evil power is indulging. Lens repair Canon EF 75-300mm f/4-5.6 III USM  Unclean power is indulging Canon EF 75-300mm f/4-5.6 III USM lens repair Evil power is indulging. Lens repair Canon EF 75-300mm f/4-5.6 III USM I climb into the computer, there is one in the warehouse. Motor available. Changing to a new one.
Assembling the lens.
Hanging on the carcass and according to tests. No result.
I put aside the half-disassembled unit.
I am writing to friends in another city, there is a control board on the lens, toss it for verification. One comrade responded. And everything turned out as well as possible. In a couple of days “Akaziya” is going to our city and will pass it on. BUT …. only during the day. Otherwise, he will have to extend the repair period.
A “shaker of the universe” on a bike rolls up to the service with a crash and hands over the fee.
The phrase “see you tonight” sounds hopeful.
Evil power is indulging. Lens repair Canon EF 75-300mm f/4-5.6 III USM I mount the board and collect the lens in a heap. For the carcass and the tests. Nothing has changed.
In the evening, the board rushed away at high speed.
Svetik- “extend the diagnostic time”.
The client is dissatisfied, three days have passed, you have not determined the malfunction and the price of repair.
Damn-clinton.
And the fact that in the previous service digging for eight days and without result?
I am writing to the Canon representative.
I know the answer in advance, the motor, the board, the gearbox.
Putting it together again.
Everything is in the same position.
Disassembling.
Scratching my turnips.
Letter from Canon, well, like, did you find it?
NO!
The motor put a new one, the board worked.
The gearbox remained.
I take it out under the microscope.
Everything is perfect. I disassemble the gearbox into noodles.
Now I found it, a piece of plastic stuck to the slot of the sector.
Evil power is indulging. Lens repair Canon EF 75-300mm f/4-5.6 III USM Taking pictures.
Assembling the lens and tests.
Ideally everything works.
Oh my, what an ambush.
Writing a report to Canon + a photo of the defect. This will go to the dossier for other engineers if they run into a similar defect.
UH, for a long time I did not resist with a horn. The question/topic is automatically published in social media. site network – follow the answers there too:

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