vadim_becker Posted March 3, 2016 Share Posted March 3, 2016 <p>Dear All,<br> <br> I just got Nikon F4.<br> All working fine up to shatter speed 1/1000 sec. Above this speed shutter working but curtains stay closed.<br> <br> Anyone familiar with this problem?</p> Link to comment Share on other sites More sharing options...
david_carroll4 Posted March 4, 2016 Share Posted March 4, 2016 <p>When you say the shutter is working, what do you mean? Does the mirror flip? Do the shutter curtains move? At speeds of 1/1000 sec and faster, you will not see the shutter "open" in any case - it's too fast.</p> Link to comment Share on other sites More sharing options...
thirteenthumbs Posted March 4, 2016 Share Posted March 4, 2016 <p>The instruction manual says not to operate the shutter with the back open as damage to the shutter curtains may occur. Fast shutter speeds will be a very brief pulse of light at best if the shutter is pointed at a bright light source.<br /> The best way to test is to load some film and do equivalent exposures of the same scene. Do not trust the battery check in a static condition, take the battery check reading with the meter activated and a grain of salt.</p> Link to comment Share on other sites More sharing options...
bebu_lamar Posted March 6, 2016 Share Posted March 6, 2016 <p>Like others said you have to verify to make sure that at those speed the shutter doesn't open at all. If they don't it could be your shutter curtain travel time is wrong. The second curtain travels faster than the first curtain. This will affect all shutter speeds but affect the higher speed a lot more. </p> Link to comment Share on other sites More sharing options...
fournier_marc Posted March 14, 2016 Share Posted March 14, 2016 <p>Does your F4 throw an error via the RED led above R2 ?<br> If no error indicated, your shutter should be working fine. If you had a shutter fault, you would get a red error led, a sequence error.<br> Tripping the shutter with back open will not destroy the shutter curtains. If anything happens to the curtains they were bad to start with. It is suggested to operate at speeds above 1/250 if back is open for testing.<br> There is a small switch, camera rear door open, end of arc of R2. The switch is in the gully. Old ones were white. Newer version are metal. Press and hold this switch in and trip shutter. You will see light right up to 1/8000. Light at 1/8000 gets very dim.<br> The two curtains travel at the same speed, the opening between curtains shrinks in size as you go over 1/250.<br> Marc</p> Link to comment Share on other sites More sharing options...
vadim_becker Posted March 16, 2016 Author Share Posted March 16, 2016 <p>Dear all. Thank you for you responses here. I will try to explain problem one's again.<br> 1. Camera working perfect in all speeds (auto, manual, program modes) up to 1/1000<br> 2. Camera making good pictures at all speeds up to 1/1000<br> 3. There is no error massages appear at any stage.<br> 4. As soon I camera using speed of 1/1000 or higher, in any mode, camera didn't make pictures (clear negative)<br> 5. All systems are working fine: film transport, mirror up and down, and shutter curtains moved.<br> The only problem they move closed :(<br> I did exactly as Marc described: Opened back, pressed left switch and checked all speeds at full open aperture and as I write before all working fine up to 1/1000 sec.<br> If any of you know how to deal with this problem I will be happy to know.<br> All best,<br> Vadim</p> Link to comment Share on other sites More sharing options...
fournier_marc Posted March 16, 2016 Share Posted March 16, 2016 Try the T setting on speed dial to see if both curtains react.. You have to hold the shutter release for more than 35 seconds to get this test right Marc Link to comment Share on other sites More sharing options...
fournier_marc Posted March 16, 2016 Share Posted March 16, 2016 <p>This has been bugging me all night. Must be my tech background.<br> The only thing I can think of is the MG (magnet) in the shutter assembly is not holding the second curtain.<br> There is good information on this page regarding F4 shutter :<br> http://www.mir.com.my/rb/photography/hardwares/classics/nikonf4/reliability/index3.htm<br> <br />There are two parts to holding the curtain open, mechanical and magnetic. I suspect the magnetic part has failed on you and is not holding the curtain open to delay closing with the proper timing slit/opening. <br> There are small transistors that control current flow to the magnets. Possible magnet failure, transistor failure or CPU fail.<br> This requires splitting the camera to get at the shutter assembly and testing it. Nikon Service did not repair shutters, they were sent back to Nikon Japan for repair and calibration. The curtains were the only service part available of the shutter. They are simple to replace and I have done it.<br> Marc</p><div></div> Link to comment Share on other sites More sharing options...
fournier_marc Posted March 16, 2016 Share Posted March 16, 2016 Simple!.... Not quite... But I got it done Marc<div></div> Link to comment Share on other sites More sharing options...
vadim_becker Posted March 20, 2016 Author Share Posted March 20, 2016 <p>Thank you<br> Finally I sent camera back to seller and purchased other one. Hope this one will be OK :)</p> Link to comment Share on other sites More sharing options...
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