Polaroid SX70 manual Front COVER/SPREAD Roll Assembly, Removal, Installation

IV - REPAIR AND ADJUSTMENTS

INTRODUCTION

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 improper linkages or connections, repair of electrical malfunctions, and adjustments needed to return the camera to proper operation.

It should be stressed that these procedures are intented to serve as guides for the experienced repair technician. Except where noted otherwise, the actual repair procedure to be used is left to the discretion of trained personnel. Their combination of training and experience should be sufficient to allow repair personnel to make on the spot judgements a to the best method of repair. A major factor which must be considered is the trade-off between time and cost materials. If the repair is easy and feasible from a cost viewpoint, it should be made. Otherwise, replacement of a part or sub-assembly is the proper choice.

There is one other general note that pertains to SX-70 camera repair. Occasionally, screw holes in the plastic become stripped. This is most apt to occur in the counter mouints, the motor mounts and where the rear upper inner frame meets the outerplate. To make an effective repair when this happens, replace the original screw with an oversize screw or insert a thin sliver of plastic into the stripped hole before the original screw is returned.

A. FRONT COVER/SPREAD ROLL ASSEMBLY

The spread rolls in the SX-70 camera are gear driven by the main gear train. Thus, in addition to wear or damage to the rolls, it is possible to encounter wear and/or damage to the drive gear. Regardless of the nature of the malfunction, the complete assembly must be replaced. The following paragraphs describe the replacement procedure.

Removal

1.Erect the camera to picture taking configuration.

2.Open the front cover by depressing the front cover release latch on the right side of the camera bed.

3.Apply pressure to the side of the cover adjacent to the cover hing aera. Press toward the gear train side of the camera. This will release the front cover. On newer models, detach the front cover from the right side (gear train side) only.

4.inspect and clean the rollers and gears with a Q-tip moistened in water. If film developer is observed under the light shield or in the film catcher spring aera, the front cover housing must be repaced.

5.If necessary, as described above, replace the front cover housing and test.

6.If the spread roll assembly is to be removed, strip the leather from the cover. (Start pulling the leather from the back and pull toward the film exit. Do not start at the film exit.) Take out two screws which secure the spread rollers to the inside of the front cover, and remove the roll assembly from the cover.

Installation

1.Position the spread roll assembly in the front cover so that the gears will mate with the main gear train when the cover is in place.

2.Install and tighten the two retaining screws used to secure the rolls.

NOTE : A new sefl-tapping, square socket head, coarse thread screw, PIN 705564 is used to effect a repair of stripped thread in the front cover assembly when installing a spread system assembly. If the hole was stripped during disassembly, the new screw will permit easy reassembly. (This screw is standard on newer cameras.)

A new square screwdriver tool bit. PIN 11867, is available from Waltham Parts Dept.

3.Position the front cover housing on the camera.

4.Install the decorative leather covering. Make sure the film exit is not covered by the leather.

5.Install the front cover by squeezing the sides of the cover just enough to engage the hinge on the pivot points of the bottom plate.

6.Close the cover and check the camera for proper operation.

NOTE : If mishandling or dropping of the camera causes breakage of the extruded metal studs used to secure and pivot the front cover, no repair is possible. Must replace the inner camera back assembly.

Figure 4-1 illustrated the studs mentioned.