Lubricating a shutter?
Hi All, You may have seen in other threads that I have a Sinar electronic behind the lens shutter that is intermitent.
Sometimes it works fine at all speeds without any problems, it manually opens and closes using the slide switch to focus etc. The iris control also works fine.
Occasionally a blade (two rotary type) will stick and if it jams it will blow the 1.25A slow blow fuse in the battery box ..I've blown about 20:mad:
The more I play with the shutter the more convinced I am that a little lubrication on the circumference of the blades will cure the problem:)...Here comes the question.......What type of grease/graphite/other should be applied and is it easily available?
Any offers of help appreciated....Cheers Dave
ps If I get it working reliably I promise to shut up about this shutter:rolleyes:
Shutterblades should never be lubricated !
Go to www.image2output-support.com/sinar/ and download all the manuals you need for your Sinar.
After reading it you should be able to solve your problem.
Hi Peter, I downloaded and printed out the link above some time ago but it doesn't contain any maintance about the electronic shutter. It's mainly for the copal shutter, a bit about the battery pack and a bit about the Expolux (a different beast) whoever it does mention lightly lubricating the channel the rotary blades rotate in. It also mentions a blade upgrade for the electronic version...BUT Sinar no longer support the electronic version and Sinar in Switzerland didn't even reply to an email!
Blown fuses are generally caused by an intermittant short. The only other possibility, could be a sticking solenoid, which could cause overheating of the circuit. In my early years, I used a 70mm rollfilm camera for portraits, and the shutter solenoid would occasionally stick. It caused me a lot of grief until I figured out that was the problem. Test the solenoid first, if that isnt the problem then check for shorts.
I have noticed that both activating solenoids give a little spark as they operate but the jamming is <0.1% of the operations.
Are they solenoids or relays of some sort? I ask because I've never seen a sparking solenoid. Is it closing a contact external to the solenoid?
I know shutters aren't supposed to be lubricated, but I've had luck on old gummy ones by hosing them off with zippo lighter fluid. The fluid evaporates leaving behind only the slightest lubricating layer. I started doing this with my 10/22 triggers because any other fluid makes them gum up and no lubricant at all makes them feel harsh. I fixed a nonworking Isolette shutter just by giving it a lighter fluid bath; it's still working.
Well unless I'm mistaken...A relay operates to activate contacts whilst a solenoid moves a cam or rod. As it releases the blades from the their home position, they are solenoids.
Originally Posted by John Koehrer
If those solenoids are sticking: clean them with lighter fluid.
Blown fuses are a sign of an overload or (temporairy short) somewhere in the circuit.
Sparks over the contacts is a sign of trouble, I would have to see that myself.
Is there a Sinar Service point in the UK ?
Otherwise you could contact the Dutch Sinar rep.
They speak english and hekp you further.
I am still in Brazil, back in Holland early September for at least 3 month.
Hi Peter, Yes there is a service department in the UK but I'm told they would send the shutter to Switzerland for a minimum set fee and I would prefer to fix it myself or have it done locally if I can (I did take it to a repairer in London who had it for a month and then said he couldn't do anything with it...He didn't even realise he had blown the fuse!)