Originally posted by twey The pin is close to the AF/MF switch. Its tip is look like end a flat screw driver. The way it work is, on AF mode it is above the mounting ring (bayonet) which allow it engage with lens screw drive. You can grab and turn it with your finger nails. When in the MF mode the pin retract back under mounting surface that allow the lens focus ring to turn freely. If it is not retract, that is the problem. If the LCD display does not shown MP when you switch to it, likely just the switch slider is off (plastic, not actual electrical switch).
Typically (since I don't have a K200D), the top and bottom need to removed first then the front cover. Be aware there maybe two screws next to the finder under rubber eye cup and one screw in flash cavity (need to pop the flash first before you remove the battery.)
Thanks twey. I realized my mistake after I wrote my previous response. That is, that the turning of the pin actually does the focusing of the lens, not turning it on. In my case, the pin does not retract. It can be pushed in and it goes in when you press the button to remove the lens, so it is not stuck. Regarding the electrical connection, I don't see anything on the LCD on the top showing whether it is in manual or auto mode. On the menu screen on the back the top entry says AF Mode: AF.S and does not change when moving the switch.
I think the switch is broken inside. When I first got the camera, I though it was a firmware issue, and I never got around to getting it fixed under warranty (you know how it is, I didn't want to be without my camera - always some event coming up when I would need it). Then, one time the switch was stuck (couldn't slide it). I got it freed up but still the same - would not go to manual mode. That's when I figured out it was the switch. And when I started asking about getting it fixed I realized that the repair cost was probably as much as the camera is worth at this point. So my alternative is to try to fix it myself. You are the only one that seems to know how to do it, so I thank you for your responses. I found a service manual online, but it tries to tell you everything in pictures, so you can understand in any language. But the pictures don't tell me which part of the disassembly I need to do. It does not look like the front comes off. I will look it over again. Maybe I can send you a picture, if that will help.
Ken