The entire ECM (rather tna its individual integrated circuits) is used as a remplacement item. For that reason, the theory of operation and analysis techniques presented in this manual have prepared in such a way that the repairman can relate a specific camera failure mode to an ECM function.
2. Switch functions
a- Switch S1 is actuated by either the red shutter release button or remote control cable release. It is operated by the photographer and it causes the camera to run through a complet exposure / film delevery cycle.
b- Switch S2 places the circuitry into the flash mode. Switch S2 si closed when the flash bar is inserted into the FFA on the top of the shutter housing. It commands the integrated circuit in the FFA to select the first unused flashbulb and, to fire the bulb. It also enables the ECM to energize solenoid #2 which limits the opening of the shutter blades so that flash exposure will be determined by
