Contax 139Q Stuck Shutter Disassembly & Overhaul

Comprehensive technical service manual for the CONTAX 139 Quartz camera, with complete disassembly and overhaul procedures for restoring stuck shutters and servicing all internal mechanisms. This workshop guide progresses methodically through removal of the baseplate, top cover, shutter speed and ISO dials, front panels, flexible circuit board, and mirror box, with annotated photographs showing exactly which screws to remove and the correct sequence for reassembly. Detailed sections cover electrical contact cleaning across the shutter speed selector, ISO dial, front plate, and transfer switch—essential for reliable operation after years of use. The trigger mechanism receives thorough treatment with comprehensive parts diagrams, while the release magnet and armature assembly are documented in step-by-step detail. Mirror and mirror stop mechanisms are fully illustrated, and shutter adjustment procedures include dedicated troubleshooting for catch bounce issues that cause unreliable firing. Additional practical coverage includes focus screen cleaning, film advance mechanism service, mirror flywheel lubrication techniques, viewfinder LED alignment during final reassembly, and ISO dial plate installation with careful guidance to avoid misalignment. The mirror replacement procedure is extensively documented with tape application methods and focus adjustment confirmation. Professional cover installation and adjustment techniques are covered in a complete final section. A mechanical emergency trigger release system is also included for reference. Numerous high-quality photographs throughout show internal components, contact surfaces, and assembly details at each critical stage. An indispensable technical resource for camera technicians and restoration specialists working on this classic rangefinder model.