Polaroid SX70 manual Interference Between Front and Bottom Covers, Top Spread Roll Looseness

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1.Interference Between Front and Bottom Covers

A few cameras may have an interference fit between the S7 actuator post and the edge of the bottom cover when the front cover is opened. The problem has been traced to slightly oversize bottom covers. Problem bottom covers have a mark «PP 2½».

One method of correction is to bias the bottom cover and front cover away from each other to the limit of the screw holes. In an extreme case, you may be able to grind the required clearance from the S7 actuator post in the front cover.

Correction of this interference problem should only be at customer request since the problem diminishes with use.

1. Top Spread Roll Looseness

There have been instances of the top spread roll popping out of the spread system. To eliminate the problem, the new spread rolls have a cap welded on the end opposite the drive gear (Figure 4-5). The cap captures the spread system frame.

When making any repairs requiirng replacement of either the spread system or the front cover assembly, replace the old spread system with a new one. If you install a new spread system in an old front cover, you must remove the light seal before installing the new spread system. The new light seal is adhered directly to the spreader before the spreader is installed in the front cover.

4. Replacing the Light Shield Cam

A manufacturing change to the Trim Assembly was made to overcome erratic action. Part of this change was to revise the cam on the light shield. (This cam resets the Trim Assembly each time the camera is closed.) Figure 4-6 compares the old shutter and cam with the new shutter and cam. The cam on the light shield of the front cover has been made wider and deeper. The tang of the trim reset lever (shutter) is now a flat bar about 1/16 of an inch wide and appears off center. It is a brass or flat black color. (All replacement shutters will be the new type.) The improved shutter will also have a cut out aera larger and squarer in shape than the older version.

Figure 4-5 New spread roll configuration

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Contents Page Page Description General DescriptionCamera Operation Opening the CameraLoading the Film pack Starting the Automatic MechanismSetting the exposure counter Viewing and focusingViewing and shooting Completing the film pack Exposures using flashDeveloping the print Shutter Description Ambient Light Mode Closing the camera11 a Location & Arrangement of internal parts Shutter Description Flash Mode Page 14 S5 being opened by the recock ram Gear train Page Power Source IntroductionLens Viewing and Exposing SystemFresnel Figures 2-3 a and 2-3 B Viewfinder optics exposingFresnel screen Viewfinder MirrorsFlare baffle Camera Elctronics 1. GeneralSwitch functions SX-70 Switch locationsS3 Being opened by recock ram S4 Switch operating configurations Switch Function Table Function SequencePage Flash Timing Sequence Chart Shutter Mechanical Details Figure Shutter, exploded viewA Solenoid S2 operation Film Processing Components Sequence of OperationsPage Max III Troubleshooting Introduction Initial TestsSX-70 Cmaera Repair Inspection Procedure Power supply and pack simulator Figure Test Equipment OperationCollimator Figure Location of new collimator targetDisengaging the idler gear Comprehensive Testers -6 Comprehensive testerModel B Camera tester Model B Camera Tester Comparalumen Light Levels Table Light Leak Tester FigureFlash Simulator Board Figure Light leak test systemManual Function Tester Figure 10 Manual camera testerManual Function Test Sequence Optical System Exit Pupil TestEntrance Pupil Test 13 Aligning the exit pupil gageUSE of Analysis Charts Concave Mirror Distortion CheckFresnel Quality Check Collimation16 Fresnel standards chart Camera/Shutter Isolation 18 Flex circuit terminal locationsCamera Analysis Charts 19 Test points on SX-70 shuttersPage Installation Front COVER/SPREAD Roll AssemblyRemoval Repairs / Adjsutments Loose Front Covers Front cover hinge studsBending the stop latch Top Spread Roll Looseness Interference Between Front and Bottom CoversReplacing the Light Shield Cam Mirror Cover / Boot Assembly Front cover light shield camBoot retaining screws
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