crwdns2944351:0crwdnd2944351:0Canon EF 16-35mm f/2.8L USM Main PCB Board Replacementcrwdnd2944351:0crwdne2944351:0

crwdns2866306:0crwdne2866306:0	Canon EF 16-35mm F2.8 L USM
Type	replacement
Thing	Main PCB Board
Title	Canon EF 16-35mm F2.8 L USM Main PCB Board Replacement
Introduction	This guide shows you how to access and remove the main PCB board. This should be done if you are needing to replace the main PCB board or if you are needing access to it for repairs such as soldering on a new contact assembly. Please note, Canon's replacement procedure of the main PCB board includes saving the data from the board to be able to transfer to the new board. This data is used by the autofocus system to ensure optimal operation. There is third party software that you can find that will allow you to transfer this data over to a new lens (though the software may cost money). Failure to transfer this data may lead to the autofocus functioning adequately, but there is a chance it may operate sup-optimally or poorly. If the board is damaged and data cannot be saved from the old board, then the new board should undergo a pulse and USM reference frequency adjustment. In order to make said adjustments, you'd need the third party software to allow you to adjust the data on the new main PCB board. However in order to successfully make the adjustments you'd need access to the service manual for this lens. Additionally, you'd need tools such as an oscilloscope and would potentially need to make your own specialized tool for these adjustments.
Time Required Min	crwdns2931287:010crwdne2931287:0
Time Required Max	crwdns2931287:010crwdne2931287:0
Imageid	crwdns2933769:0crwdne2933769:0 crwdns2933771:0crwdne2933771:0
Difficulty	Moderate
Conclusion	To reassemble your device, follow these instructions in reverse order.
Author	Zephosk
Public	crwdns2853046:0crwdne2853046:0

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