Welcome to the Pentax Forums!
Is there any chance you have inserted the battery upside down? Beyond that, it is quite possible that your meter is no longer working properly
, though usually that would affect both the aperture and shutter speed Edit: not so. If you wish to attempt a repair yourself, you will need:
- A set of JIS cross-point miniature screwdrivers and other tools appropriate for working with small parts
- Steady hands
- Either excellent eyesight or a workbench magnifier
- Accurate multimeter
- Experience and gear for fine soldering
- A service manual explaining how things work and where things are: Pentax Manuals. The manual available from the linked page includes detailed instructions on how to troubleshoot and fix the problem you described.
Google may also be your friend.
Steve