After reading a few more threads:
- I get overexposed first image while usually the "solenoid syndrom" produces dark images. This is strange. Did somebody got the same issue?
- An original solenoid from this supplier https://www.ebay.fr/str/photontech?_trksid=p4429486.m3561.l161211 is quite expensive, nearly the same as an old second hand camera with original solenoid.
I have an old Pentax K100D that I could dismantle and take the solenoid off.
Do you know if K100D is fitted with the original solenoid from Japan or the cheap one from China?

May be,
but after reading a few threads about this issue it seems that it's usually the opposite.
Most of users are reporting the first image to be too dark while it's too clear on my K200D

Solenoid failure??
Not sure, because only the first image after I switch the camera on is affected.
As long as I dont switch off it works like a charm.

My Pentax K200D works correctly, BUT
When I turn it on, the first image is always overexposed (too clear)
Exif aperture and speed of first image are the same as next takes of the same image.

I have tested many ways to solve this issue.
- Use normal batteries instead of rechargeable
- Disable AF and stabilisation
- Change lens
- Clean lens electrical contacts
- Turn back to factory settings
- Test various AE settings (spot, full view,..
None of these is working.
Any idea?