I've got this problem on my DS too. In my case, the switch still works as a shutter release, but the two stage depression has failed, so it won't autofocus, which is a bit of a pain. The workaround is to set the ok button to activate the autofocus. But it can only be a matter of time before it totally fails. I've disassembled, squirted with contact cleaner and fiddled as much as I can, but no joy.
Originally posted by wlachan Back then that switch was available seperately for the Z-1p
Much to my - (and it seems everyone else's) - annoyance, UK Pentax servicing has been outsourced from local Slough HQ. I've emailed them twice about getting a replacement part, but had no reply. I'll try giving them a ring, but I now have rather low expectations about a response. The Z-1p tip is priceless, as it enlarges the potential pool of knackered bodies on ebay to target for cannibalisation. I'd guess these switches are pretty standard and ubiquitous - but without disassembling dozens of models it's hard to know. Anyone have any experience?..