Nikon F4, red led blinking after each shot.

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zanxion72

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The Nikon F4 I have now is a replacement for another one that could not load the film properly. This one seemed to be working fine, but I have found out that when pointing the camera to a bright source, the shutter fires, the red led starts blinking and the camera gets locked. This occurs in the Ph, P and S modes and always when a lens is on the camera. In modes M and A there is no problem. I take care not to get a HI indication in the viewfinder, and it seems that it occurs even when setting the ISO to 50, point the camera to a lamp and get it locked even at speeds of 1/250 sec or slower.
The lenses that I have tried with it are the Nikkor 50mm 1.8D and the 35-80 G. Using both lenses I get the same problem. and it happens with, or without the DP-20 attached. If I remove the lens, then everything works fine.
All speeds work fine and the aperture gets correctly set all the way from 1.8 down to 22.
Also, when I set the ISO high, say ASA3200, I get the same effect even in low lit scenes. I have tried everything, even fresh batteries, but I could not resolve the problem.
I have tried the same lenses in the other body and at the same modes, and it does not exhibit this. I have also tried the
What could be wrong with it? Could it be something easy to fix? Is it something I am doing wrong?
 
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I've never heard of a 35-80mm G lens, but an AF-D 35-80mm F4-5.6 exists. :smile:
I suppose you are setting the aperture ring to the minimum aperture, typically F22 and locking the ring with the switch in order to work in P or S modes. Do that and set the camera to P. Does it happen again?
If so, then you need to send the camera to be repaired. In the UK, I'll recommend Fixation or Aztech Services.
They'll do a CLA and you'll get an F4 as new as the day it was born. :smile:
 
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zanxion72

zanxion72

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Indeed, there is no such lens. It is the Nikkor AF 28-80 f/3.3-5.6 G the other one I have used. I have also emailed Aztech asking them if it is possible to send the camera for repair.

All I can thing of is trouble in the communication between the lens and the camera. When I use no lens, it never gets locked.
 
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zanxion72

zanxion72

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:smile:))) Cmon, I don't take photos without the lens. I am just trying to troubleshoot the problem. When there is no lens, the camera never gets locked. But when you put the AF lenses on it is almost impossible to get it to work pointing to some bright spot in Ph, P and S. In A and M there are no problems.

I was wondering that the fact that trouble comes in Ph, P and S modes, if there is a problem with the camera setting the aperture automatically although I have it locked at the minimum (f22). This might explain why when shooting at dark places I get no lock (aperture remains wide open), while shooting bright scenes gets it locked (it attempts to close the aperture automatically, but it fails to do so).
How can I test this?
 
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zanxion72

zanxion72

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Ooops! I think that this one is for repair by specialists too. Digging down in the Nikon F4 Repair Manual I have found this:Sequence Errors, case 3
Aperture control error when the aperture pulse is counted more than 21 in 10 ms after aperture Mg is turned on (page 90).
:sad:
 
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Yeap, it looks like a problem in the aperture control. As the camera works in A and M modes, it might indicate that, as I suspect the camera doesn't use the electronics in the lens in those modes.
BTW, I have those same lenses and the AF-G 28-80 might be very plastic, but it is a very good lens, especially considering its price. :smile:
 
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zanxion72

zanxion72

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Another horrible fact that proves what you have said. In S and P, no matter what aperture the meter selects, the lens gets stopped down to f/22! :sad: At least I can use it in A and M.

I have kept the AF-G 28-80 just because of that. It is surprising good for its poor construction and price. The only drawback with it is that I have it in silver/chrome and it does not look good on my black cameras. :smile:
 
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