Originally Posted by Ivan Glisin 
DS, DL, K100D instructions too! M.S. Shin posted instructions for these cameras as well.
Here is the link:
self focus adjust for dl,ds,ds2,k100d.: Pentax SLR Talk Forum: Digital Photography Review
And the message, in case it suddenly "evaporates" from DPreview:
My note on #2: after pressing the "Menu" button go first to the "Set-up" menu. This is not quite clear, it looks like the right menu appears right away. Once in the "Set-up" menu three new options are added after the last option ("Reset" on *istDS) as follows:
CAPTURE TEST
SYSTEM TEST
AF TEST
Inside the AF TEST menu there are two options:
- AF Area Test [values 0 to 3]
- Focus Corr. [range -120 to 120 um]
So go down to "Focus Corr." and use left/right keys to adjust value, "OK" to accept, "Menu" to exit.
-= IVAN =-
Which direction , left or right, to correct front focus problem?
Thanks