Polaroid SX70 - Manuals

Thus, the cover must be fulled closed, the gears engaged, and the latch fully seated, in order to actuate the drive motor. As S7 closes, power is applied to the drive motor (S8 is also involved and is discussed in a following paragraph), the gear train is set in motion and actuates a device called t...

shutter to initiate a series of events. The shutter blades close to cut off the optical path. The hinged Fresnel viewing screen is swung upward and comes to rest in front of the fixed viewing mirror (Figure 1-8 B). The shutter opens and closes to perform the exposure function. A first-surfaced takin...

slide. The counter will start at number 10. Since switches S8 and S9 are physically attached to the counter, the camera will cycle through 10 exposures even though there be less than 10 sheets of film in the pack. This deviation must be recognized whenever a partially exposed pack is used. The image...

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 asso...

When the release button is pressed, a switch S1 closes (Figure 1-11 A and B) and applies operating power to the shutter. As soon as power is applied to the shutter, solenoid #1 is energized and rapidly moves the shutter blades to the closed position. When the solenoid has reached the end of its stro...

to an adequate level to hold the solenoid after the high-current circuit has completed the solenoid operating function and switches on the motor drive circuit. Thus, the shutter will remain closed, with minimum battery drain. Light entering the lens is now cut off and the reflex mirror is swung upwa...

Figure 1-14 S5 being opened by the recock ram (Gear train) Figure 1-13 B Interceptor link, Solenoid 2, S2 operation - Solenoid energized

II - THEORY OF OPERATION A general description of the camera and the sequence of its functions is contained in Section I. In that section, detailed analysis of individual assemblies and electrical circuits was minimized so that emphasis could be placed on the intenelation-ship of various functions. ...

The screen itself is a sheet of plastic upon which are impressed series of concentric rings much like the grooves pressed into a phonograph record (Figure 2-3) instead of having a vee shaping; however, the grooves in the Fresnel screen form a saw-tooth with a tooth angle increasing slightly with eac...

Figure 2-7 S3 Being opened by recock ram c- Switch S3, normally closed at the begining of the exposure cycle is opened by the recock ram located in the gear train assembly. See Figure 2-7. As the exposure sequence begins, S3 opens and actuates a delay circuit (Y delay) in the EMC which retards the s...

Figure 2-8 S4 Switch operating configurations damage to the circuit in the event that flashbulb becomes short-circuited after it is fired. e- Switch S5 (normally closed at the beginning of the exposure cycle), like S3, is located in the gear train and actuated by the recock ram (Figure 2-7). When th...

Figure 2-8 A S8 - S9 Exposure counter switches 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 p...

mechanical coupling device set the exposure counter to the position just before the first exposure and closed S8, but since S7 has removed all battery power no action occurs). h- At the end of the 40 millisecond delay period, the ECM removes power from solenoid #1 and the shutter opens. Simultaneous...

k- If the operator has removed pressure from exposure button all power will be removed and the shutter blades will open to permit viewing. If the button has not been released, the shutter blades will remain closed until the operator removes his finger from the button. at the aperture for flash expos...

The following paragraphs describe the manner in which the mechanical components of the shutter respond to either manual or electrical direction. 1. When the operator prepares to take a picture, he first must aim and focus the camera. As he rotates the focus wheel to bring the split Fresnel image int...

Figure 2-9 A Solenoid S2 operation 2. When an ambeint light exposure is being made, all of the action just described takes place but does not affect the shutter action. However, when a flash array is inserted switch S2 in the flash socket programs the electronics to energize solenoid #2. The impact ...

Figure 2-10 Spread roller system The basic theory of the film processing method remains unchanged from previous Polaroid system. That is , the developping chemistry is encapsuled in a pod on each sheet of film and, as the sheet is passed between rollers, the pod is burst and the chemical spread even...

III - TROUBLESHOOTING The Sx-70 camera is an electronically controlled device, the electronics being in the integrated circuits (IC) mounted in the Electronic Control Modul (ECM) and Flash Fire Assembly (FFA) in the shutter housing and in the Motor Control Circuit (MCC) in the camera back. Because t...

SX-70 CMAERA REPAIR INSPECTION PROCEDURE A. FUNCTIONAL TEST 1. Perform light leak test. 2. Check focus and trim wheel torque. 3. Check trim wheel reset ±2 teeth and front cover to shutter gap. 4. Cycle camera 3 times at 5.0 and 6.4 volts with power pack. 5. Focus camera at 8’ - performe aperture tes...

Figure 3-2 SX-70 Collimator Figure 3-1 Film pack simulator and power suplly Checkout the SX-70 camera requires the use of several pieces of test equipment. The purpose of this section is to instruct you in the proper use of this equipment. 1. Power supply and pack simulator (Figure 3-1) In use the s...

Figure 3-2 Typical collimation conditions Figure 3-3 Location of new collimator target a. Collimation of the Split Image Viewing System. NOTE : If the collimator is not available, set the focus wheel to infinity and look at a scene at least 200 feet away. Observe that the focus is sharp within a tol...

Figure 3-5 Disengaging the idler gear (2) Open the camera front cover slide the camera onto the horn of the collimator. Make sure that the camera is all the way on the horn so that the camera is captured by the spring latches.(3) Swing the collimator infinity lens to its vertical position. (Be sure ...

(8) Look through the camera and observe the vertical line target. Compare the observed image with Figure 3-4 to determine if the camera is within specifications. NOTE : There is no separate close-focus adjustement on the camera. if the focus wheel has reached its stop before maximum resolution is ac...

b. Ambient mode exposure test (1) Place the S2 switch int he OPEN position. Set the voltage to 5.8 volts(2) Set the light level selector to the desired 100 light level(3) Slide the camera over the horn on the tester. The camera should go through the dark slide (S8) cycle. If not, remove the camera f...

(4) Slide the camera fully onto the horn.(5) Select the light level desired on the Comparalumen and slide the horn up against the appropriate window. (Position the horn so that the locating pad on the front of the horn touches the window.)(6) Insert a remote shutter release cable into the socket on ...

Figure 3-10 Manual camera tester c. Install the flash simulator board into the camera flashbar socket in the same way as a flashbar would be installed .d. Press the red exposure button, S1.e. Observe that LED #1 flashes.f. Flip switch S1 up.g. Press the red exposure button.h. Observe that LED #2 fla...

MANUAL FUNCTION TEST SEQUENCE Test Mode Action Shutter Response S6/S7 Close S6/S7 Press and release S1 button to check for mechanical binding. Observe current drain. No reaction (Blades open, motor off) AMBIENT Exposure Mode Remove flash array from shutter. Close S1 Open S5 Open S1 Open S3 Close S3 ...

Figure 3-11 SX-70 Viewfinder system Figure 3-12 Installing the exit pupil gage Viewfinder quality refers to the general quality and alignment of the camera optics. For the user, it can be precisely defined as the appearance and clarity of the image as seen through the viewing system (Figure 3-11). W...

Figure 3-14 Exit pupil images Figure 3-13 Aligning the exit pupil gage (3) The mounting rails for the gage must be flush with the eyelens frame. Check by holding the bottom of the eyelens frame with the thumb and apply slight pressure in the upper front of the gage with the right index finger. The g...

Figure 3-15 Identifying distorted mirrors 3. Concave Mirror Distortion Check a. Focus on a target which presents a clear vertical line (for example a door frame).b. Scan the camera horizontally.c. If the mirror is not distorted, the vertical line seen in the eyepiece will vary at the camera is scann...

Figure 3-16 Fresnel standards chart you to a chart. In all cases, the fault analysis charts present the logical sequence of checks and remedial procedures. These charts are divided into three parts : - one, (CAMERA ANALYSIS) for problem analysis when the camera is completely assembled - two, (OPTICA...

Figure 3-18 Flex circuit terminal locations 1. Camera/Shutter Isolation To expedite the repair procedure, it is essential that the malfunction be isolated to either the camera back or the shutter as early as possible in the troubleshooting procedure. The sequence should not be considered inflexible,...

Figure 3-19 Test points on SX-70 shutters Figure 3-18 Testing instrument connections d. With the 1000 ohm resistor still in place, connect a jumper wire between the motor (minus TP9 contact) and the battery (minus TP1 contact) for a moment : (1) If the motor runs, the MMC is defective.(2) If the mot...

IV - REPAIR AND ADJUSTMENTS This section of the manual is primarily devoted to disassembly/reassembly procedures. These procedures provide step by step instructions aimed at guiding the technician through the intricacies of SX-70 camera repair. The procedures cover such things as replacement of impr...

Figure 4-1 Front cover hinge studs Figure 4-2 Comparison of spread roll brackets (4) Close the front cover and recheck; bend further if necessary.(5) With the front cover open, observe for a clearance between the latch and the 3 rd idler gear.(6) Observe that the stop pin (Figure 4-3) is not resting...

Figure 4-4 Comparison of decal before and after front cover closure Figure 4-3 Bending the stop latch

Figure 4-5 New spread roll configuration 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 bo...

Figure 4-6 Front cover light shield cam Figure 4-7 Replacing light shield cam When a new type shutter is installed, the cam in the light shield must be inspected and changed if necessary. The new cam should be installed in the same place and manner as the old cam (Figure 4-7). Remove the old cam uis...