i publiced the following story on anther forum, but to improve my changes, i'll also post it here.
Hours and hours i spend time on finding a service manual of the Canon EF 100-400 f/4.5-5.6 L IS USM lens. No luck so far.
I bought the lens togehter with a eos7d camera, and got the lens as a gift from the seller.
It was full of dust, sand, and lots of fungus, and totaly stucked.
At this moment i was pretty succesfull. Got all the glas clean. Managed to get it all back togehter, until the last lens group. I do have a couple of screws left, and i am not able to focus the lens manual, but i think thats just a detail. I do have a very optimistic character )))
This week i bought at aliexpress 1500 tiny screws, wich i am sorting out now. I do need some screws that i had to drill out of the lens. I was vey happy to see that this screws are in my mix package, since i saw prices of about $10,- for just 1 screw on ebay.
I did test the pcb board, and to my disappointment it didn't show any sign of live. If i will have a little change to repair my lens, i do need a service manual, included with the electrical lay out.
So far i did find 1 importand component of the pcb, the MB3776A, a power supply controller. I am very happy i found it, couse that gives me at least the change to check the power part from the pcb.
It would be a great, great help for me, if someone has a service maual from this lens, and is willing to share it with me.
A small fee would be no problem, but since all people who i contacted so far, like Canon Netherlands, told me i have a very, very, very little change to get it back to work, so i don't want to spent much money on it.
The whole project is a big chalange to me, but so far i enjoyed all the hours i spend in it, seeing i do make progress in the whole repairing proces.
BTW.....happy 2018 to all the readers of my repairing story.