Polaroid SX70 manual Switch functions, SX-70 Switch locations

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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 flash-to-subject distance. When the solenoid #2 is energized it engages a mechanical coupling between the shutter blades and the focusing mechanism.

Figure 2-6 SX-70 Switch locations

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Contents Page Page General Description DescriptionOpening the Camera Camera OperationStarting the Automatic Mechanism Loading the Film packViewing and focusing Setting the exposure counterViewing and shooting Completing the film pack Exposures using flashDeveloping the print Closing the camera Shutter Description Ambient Light Mode11 a Location & Arrangement of internal parts Shutter Description Flash Mode Page 14 S5 being opened by the recock ram Gear train Page Viewing and Exposing System Power SourceIntroduction LensViewfinder optics exposing Fresnel Figures 2-3 a and 2-3 BFresnel screen Camera Elctronics 1. General ViewfinderMirrors Flare baffleSX-70 Switch locations Switch functionsS3 Being opened by recock ram S4 Switch operating configurations Function Sequence Switch Function TablePage Flash Timing Sequence Chart Shutter, exploded view Shutter Mechanical Details FigureA Solenoid S2 operation Sequence of Operations Film Processing ComponentsPage Max Introduction Initial Tests III TroubleshootingSX-70 Cmaera Repair Inspection Procedure Test Equipment Operation Power supply and pack simulator FigureLocation of new collimator target Collimator FigureDisengaging the idler gear Comprehensive tester Comprehensive Testers -6Model B Camera tester Model B Camera Tester Light Leak Tester Figure Comparalumen Light Levels TableLight leak test system Flash Simulator Board Figure10 Manual camera tester Manual Function Tester FigureManual Function Test Sequence Exit Pupil Test Optical System13 Aligning the exit pupil gage Entrance Pupil TestCollimation USE of Analysis ChartsConcave Mirror Distortion Check Fresnel Quality Check16 Fresnel standards chart 18 Flex circuit terminal locations Camera/Shutter Isolation19 Test points on SX-70 shutters Camera Analysis ChartsPage Installation Front COVER/SPREAD Roll AssemblyRemoval Front cover hinge studs Repairs / Adjsutments Loose Front CoversBending the stop latch Top Spread Roll Looseness Interference Between Front and Bottom CoversReplacing the Light Shield Cam Front cover light shield cam Mirror Cover / Boot AssemblyBoot retaining screws