You can't manual focus if you have a remote control hooked up to the focus/iris port on the camera, you will only be able to use the remote. Otherwise, try turning off Auto Focus.
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if you can remove the left side and see the lens inside then you can blow air in it , because some obstacles are in the way of focus ring and /or sensor,not so easy to do,usually is not electronic but mechanical type of failure.
Hello there!
Focus ring lock means that some how the focus ring is not turning freely.
If it turns easilly then inside the optocoupler unit which reads out the movement of ring must be dust or damage.in the flexicable.
Therefore somehow the camera should be disassembled got cleaned by pressurized air in case of dust and reassembled and hopefully it should work without problem.
Focus controls are on the back of the flyback transformer. You may have bumped one while the back was off. Due to dangers working on live circuits I recommend you have a service professional adjust the focus.
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