Rolleiflex SL35 Photometer Repair and Calibration Guide

Comprehensive workshop manual for diagnosing, repairing, and recalibrating the exposure meter in the Rolleiflex SL35. This authoritative service guide walks through the Wheatstone bridge circuit design, photoresistor replacement procedures, and the complete calibration methodology required to restore accurate metering. Full electrical schematics and component specifications cover both original and revised meter circuit variants, alongside practical troubleshooting techniques for common meter faults. The documentation explains the three-range potentiometer adjustment system (RI, RII, RIII) with step-by-step procedures for each calibration stage. You'll find detailed discussion of photoresistor degradation—a frequent problem in aging SL35 bodies—including identification and replacement of both gold-cased and silver-cased CdS photocell types. The repair guide includes internal assembly photographs, measurement protocols using calibrated light references, and essential precautions for protecting the viewfinder optics and diffusing screen during disassembly and meter work. Indispensable for camera technicians and experienced restorers working to return metering accuracy to classic Rolleiflex SL35 cameras.