Pentax KX
The Pentax KX, launched in 1975, is a fully mechanical 35mm SLR and a more advanced sibling to the K1000. It retains the K1000's robust build and manual operation but adds several features. These include a self-timer, depth-of-field preview, and mirror lock-up for critical shooting. Notably, the KX displays both the selected shutter speed and aperture within its bright viewfinder, offering more comprehensive shooting information compared to the K1000's match-needle system. Its K mount provides compatibility with a wide array of lenses.
Files
Service manual for the Pentax KM and KX
The original Pentax parts diagram for the KX
The factory service manual for the K1000. Many mechanical Pentax cameras shared the same mechanisms, so a useful reference.
Documentation on the meter for the Pentax Spotmatic and other models