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Canon PowerShot SD850 IS / IXUS 950 IS Digital Camera in this both models usually this problem appears, open the camera then take out the lens unit, below this unit you can see the iris control stepper motor and related small wheels this may be worn out or may be misplaced, correct it. if still problem,open the lens unit to check the possible break on the iris lens connecting cable.
are you using this on a nikon camera if so the iris
ring may have moved you need to move the ring to the red number you will see a bump on the iris
ring there is a swich you slide to see a orange dot
this will lock the iris ring
Hi, Couple of things can be bad in this symptom. Either CCD Imager is defective and not producing image signal or IRIS control is no working. CCD Imager would be replaced in case its bad. IRIS control can be repaired by qualified camera tech. Need further info, let me know.
This is for Sanyo VPC-HD1, VPC-HD1A black screen problem how to clean auto iris unit.First you have take apart camera : remove 4 screws from right side (in battery compartment) 2 screws from bottom, 2 screws from top (there are different short one is from rear) and last screw from front,
now pull left cabinet from top and take appart.Be carefull !!! there is flash capacitor you need to discharge it before doing anything else.You can discharge with 1Kom 5watt resistor .
After that remove 1 screw holding speaker, disconnect and remove speaker.Now pull power board PW-1
there is a screw holding lense ring remove that screw, disconnect 2 connectors from lense assy
(from ccd just pull, from lense unlock and pull flat cable now you can remove lens assy.
Next remove 3 small screws holding heat sink (rear of lens assy) after that remove spacer (black tape from top of lense and another small tape at rear top of lense. Now you can see 7 white screws and 1 black screw remove all of them.Black screw holding iris unit.Now carefully lift zoom motor focus motor 2 sensors nd filter assy and iris unit they came out all together.Next thing main thing you have to open iris unit it is easy to do with sharp blade on the edge of iris unit you will find 2 locks holding
metall casing of iris unit put blade between metal and plastic case and pry to remove metall case.
Now you will find iris 2 blades there are different you need to remember wich is wich.Now carefully remove both blades (they might stick to each other because of grease) and place them into isoprophyl alcohol after that put them on to napkin fold napkin so blades are inside and dry them
you also need to clean iris unit where blades are going from grease and also clean zoom motor and focus motor shafts to remove grease. Now put everything back together and i hope you can do that.
On most lenses the way to test if your old lens works on a cannon digital to set the camera to AV then set the iris to the small setting ie F16/F22 then use the stopdown button.
Things that might happen
1 The lens will close down OK
2 The error 99 will show,will need are rechip if avaliable
3 Nothing happens, will need a rechip
Q.Why will it work inside but not outside.
A. Inside the camera needs light so the iris is full open, outside the lens needs to close down and if not compatible it is unable to close down. will need a rechip