F4 issue

[DCP69]

Hi
I have just received a mint condition, hardly used F4.
I inserted 6 new AA batteries and get the two red LEDs on the back of the MB-21 motorwind when I press the little button, so all is good.
However, I can’t see any information in the viewfinder and the shutter won’t fire.
I’m using an AF-S 50mm 1.8 G lens.
Can anyone help? Am I missing something silly here, or is it an electrical circuit board fault and needs professional help?
Thanks

 

[BF Hammer]

Before I lose the link, here is a user manual online: https://www.nikonclassics-michalke.de/Prospekte/F4-F4S_k.pdf

I might shine a light in the battery cavity of the F4 body and look for any dirt, oxidation, or obstruction on a electrical contact. You can use white vinegar on a Q-tip to clean battery contacts. But used gear, it can have an electrical failure and look normal to the eye.

 

[DCP69]

Hi
I appreciate the reply and the manual link.
The battery contacts are all ‘as new’ - no corrosion at all. I have cleaned them and also given them a light rub with fine grade grit just in case there was some type of covering on them.
I was wondering if I was doing something silly with the basic set up? If not, I guess it has to be an internal ecb fault or similar

 

[Needa]

Take a look here https://www.kenrockwell.com/nikon/f4.htm
and see if there is anything helpful under more information.

 

[hark]

Do you have a camera store in the area that could look at it? I know there aren't a lot of those around anymore though.