SPECTRA - spectra meter

Comprehensive assembly and service manual for SPECTRA photographic exposure meters, covering Professional, Universal, and Combi-500 models. This technical reference provides detailed procedures for the manufacturing and maintenance of these precision light measurement instruments equipped with selenium and CdS photocells. The Manufacturing section presents step-by-step assembly instructions covering the installation of cell glass, lead wire connections, photocell assembly and electronic components assembly. Calibration procedures and final quality check-out processes are thoroughly explained, along with final packaging specifications. The Servicing section delivers extensive troubleshooting and repair guidance, regular maintenance protocols, comprehensive parts list with part numbers, and tools inventory required for proper servicing. Detailed assembly drawings are provided for all model variants, including original and current Professional/Universal configurations, and Combi-500 schematics featuring the dual photocell design with booster circuit and switching mechanism. This manual enables technicians and repair specialists to execute all service operations with technical accuracy and understand the complete architecture of these photometric instruments.