Polaroid SX70 manual Function Sequence, Switch Function Table

Page 22

h- Switch S8 (Figure 2-8 A) is part of the exposure counter operated by the counter wheel. As S7 closes, power is applied, ejecting the dark slide. After the dark slide ejection, the counter wheel turns, opening S8. S8 then remains open until the film pack is removed. When the pack is taken out, S8 closes.

i- Switch S9 is near S8 on the exposure counter assembly. When the counter reaches the 0 position, switch S9 closes and the ECM inhibits the falsh-firing function, so that if an unused bulb is still available it will not be wasted.

j- For an handy summary, see the Switch Function Table.

3. Function Sequence

The following paragraphs describe the sequence in which operate during normal operation of the camera.

a- The operator opens the camera. Switch S6 connects the battery to the camera circuitry.

b- The operator opens the front cover. Switch S7 opens and removes battery power from the camera.

c- The operators open a film pack. (when the Figure 2-8 A S8 - S9 Exposure counter switches

previously used film pack was

removed, a

 

 

 

 

SWITCH FUNCTION TABLE

 

Switch

Action

 

Result

 

 

 

 

 

 

1

closes

 

Initiates exposure cycle and causes circuitry to take and

 

 

deliver the pictures.

 

 

 

 

 

2

closes

 

Connects circuitry to take flash pictures.

 

 

 

 

 

 

3

opens

 

Initiates «Y», 40 milliseconds delay. (Power down

 

 

solenoid #2 in the flash mode)

 

 

 

 

 

 

CA closes

 

Controls power to solenoid #1 (drop current to holding

 

4

 

level).

 

 

 

 

 

CB closes

 

Signals the ECM to start the motor.

 

5

opens / closes

 

Stops motor both by closing and opening depeending upon

 

 

sequence of action and internal circuitry.

 

 

 

 

 

 

closes

 

● Connects the battery to the electronic circuitry when the

 

6

 

camera is open to use.

 

 

 

 

 

opens

 

● When the camera closed, cuts power from battery.

 

 

 

 

When S8 is also closed, it provides power to the camera

 

7

closes

 

when the front power is latched (for dark slide eject). Also

 

 

 

 

acts as an interlock during normal picture taking.

 

8

closes

 

Enables (with S7 closed) the circuitry to eject dark slide.

 

 

Opens again after the dark slide is ejected.

 

 

 

 

 

9

closes

 

Prevents firing flash if film pack counter is on «0».

 

 

 

 

 

Image 22
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 Lens Power SourceIntroduction Viewing and Exposing SystemFresnel Figures 2-3 a and 2-3 B Viewfinder optics exposingFresnel screen Flare baffle ViewfinderMirrors 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 gageFresnel Quality Check USE of Analysis ChartsConcave Mirror Distortion 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