Polaroid SX70 manual Closing the camera, Shutter Description Ambient Light Mode

Page 9

Figure 1-9 Inserting the flash bar

10. Closing the camera

When through using camera it be can folded and latched in its closed configuration by pushing the erecting link. When the camera is closed, the interlock switch (S6) is opened so that the battery is completely disconnect from the camera circuits. The trim wheel (the lighten / darken adjustement associated with the photocell) automatically returns to its normal position each time the camera is closed.

C. SHUTTER DESCRIPTION (AMBIENT LIGHT MODE)

The shutter employed in the SX-70 camera is unique. No direct comparisons should be drawn between the manner in which it functions and the function of other Polaroid electronic shutters. No manually adjustable orfixedapertureisemployed. When a picture is taken, two shutter blades, with

specially shaped cutouts, open the lens from a totally closed position to a suitable aperture. The two blades then reverse direction and again shut off the optical path. These same two blades also contain a similar (although differently shaped) pair of cutouts that open and close the light path to the photocell in like manner. In the following description the functions of photocell cutouts is deferred until the action of the shutter cutouts is explained although in operation, the two functions are interdependent.

When the camera is open for viewing, but before the release button is pressed, solenoid #1 is deenergized and the shutter blades are open. A spring (openong spring) holds the shutter blades wide open (Figure 1-10). The lens thus provides maximum viewing / focusing brilliance. Solenoid

/spring action is discussed in detail in the next section of this manual.

Figure 1-10 Shutter blades held opened

Image 9
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 Exposures using flash Completing the film packDeveloping 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 Introduction Power SourceLens Viewing and Exposing SystemViewfinder optics exposing Fresnel Figures 2-3 a and 2-3 BFresnel screen Mirrors ViewfinderFlare baffle Camera Elctronics 1. GeneralSX-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 TestConcave Mirror Distortion Check USE of Analysis ChartsFresnel Quality Check Collimation16 Fresnel standards chart 18 Flex circuit terminal locations Camera/Shutter Isolation19 Test points on SX-70 shutters Camera Analysis ChartsPage Front COVER/SPREAD Roll Assembly InstallationRemoval Front cover hinge studs Repairs / Adjsutments Loose Front CoversBending the stop latch Interference Between Front and Bottom Covers Top Spread Roll LoosenessReplacing the Light Shield Cam Front cover light shield cam Mirror Cover / Boot AssemblyBoot retaining screws