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

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