Polaroid SX70 manual Comprehensive Testers -6, Comprehensive tester

(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 achieved, return to the infinity check. If there is any tolerance at that setting, readjsut the infinity setting as close as possilbe to the focus wheel stopping point and recheck the close focus. If it is still impossible to obtain a sharp image, the lens is defective and the shutter must be replaced.

NOTE : The foregoing tests assume that when the camera is operated, the viewing mirror (Fresnel carrier) reaches the correct attitude during the exposure cycle. If the lens has been correctly collimated, the only check possible of actual picture definition is to expose film.

3. Comprehensive Testers (Figure 3-6 and 3-7)

There are two models of Comprehansive Testers available for semi-automatic testing of the SX- 70 camera. The earlier model, Comprehensive Tester Model A, consists of three interrelated units : the lightbox, the electronics module, and the power supply (Figure 3-6). Comprehensive Tester Model B (Figure 3-7) also consists of three

interrelated units : the Comparalumen calibrated ligh source, the electronics module, and the mounting horn or holding fixture. The purpose of both tester models is to check the dynamic operating functions of the camera ( A detailed description of the later tester is available in a technical manual titled «Model B camea tester». This section will deal only with the operating instructions for the tester.)

MODEL A CAMERA TESTER a. Set-up

Before testing the camera, perform the following set-up procedure.

(1)Calibrate the tester daily. Record the calibration reading in a log. (If the test equipment is suspected of poor performance, calibrate more frequently and repair if necessary.)

(2)Remove the front cover from the camera

(3)Set the L/D control to the mid-range position usiong the trim reset cam and focus the camera at infinity.

(4)using the S7 actuator, close teh s7 switch.

(5)Allow the tester to warm up for a period of

30 minutes.

Figure 3-6 Comprehensive tester