Polaroid SX70 manual Mirror Cover / Boot Assembly, Front cover light shield cam

Figure 4-6 Front cover 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 uising an x-acto knife to cut the plastic rivets. Place the new cam in the same position, making sure the cam lip goes over the edge of the light-shield as shown, and the pins through the four holes. When assembled, apply heat enough to peen over the ends of the pins projecting through holes - thus staking the unit in place.

If new cam are not available, it will be necessary to install a new front cover assembly.

B. MIRROR COVER / BOOT ASSEMBLY

The mirror cover assembly consists of the mirror cover, the boot, and the viewing mirror. Because of its construction, ti is not feasible to disassemble the mirror cover assembly itself and, therefore, whenever one of its major components fails the entire assembly is replaced. The mirror cover could sustain damage in the form of cracks or broken hinges, or overall distortion. The boot could be cut, torn and damaged by wear. The mirror could be loose or displaced in its mounts, broken, or its surface damaged beyond cleaning. Should any of these faults be evidenced, replace the assembly.

NOTE : On older cameras, a coding system is used to match Fresnels and mirror covers. When changing mirror cover and Fresnel assemblies, correct color coding must be employed to prevent unacceptable tolerance buildup. This is usually demonstrated by difficult cloding the camera, etc. The chart below shows the color codes to be used : a red coded Fresnel goes with either a red, yellow, blue or white mirror cover; not with a green mirror cover. The choice should be the first in order of the chart. Red first, yellow second, etc. The color code is located on the mirror cover, on the underside, upper right-hand corner, viewed as if holding the camera to take pictures. On the Fresnel assembly, it is marked on the protective paper at the point where the adhesive seals the paper around the Fresnel.

COLOR CODES USED WHEN CHANGING

FRESNELS AND MIRROR COVERS

MIRROR COVER

Fresnel	● Red	●Yellow	● Blue	●Green	● White
● Red	x	x	x		x
● Yellow	x	x	x	x	x
● Blue	x	x	x	x
● Green	x	x	x	x
● Black	x	x

Newer cameras employ a universal Fresnel/ Mirror cover assembly. No matching of coded parts is necessary.

Figure 4-7 Replacing light shield cam

Removal

1.Erect the camera to picture-taking configuration.

2.Open and remove the front cover.

3.Remove the decorative leather covering from the bottom cover.

4.Remove the four bottom-cover retaining screws.