Polaroid SX70 manual Repairs / Adjsutments Loose Front Covers, Front cover hinge studs

Figure 4-1 Front cover hinge studs

Repairs / Adjsutments

1. Loose Front Covers

Some cameras have been detected with loose front covers due to improper latching. This problem occurs when the «knife edge» of the front cover latch is not firmly, and/or correctly seated in the latch retainer, thereby causing excess «play» between the latch and retainer. To resolve this problem, perform the following procedures :

a. Confirm that problem is not caused by loose screws on the spread system assembly by closing the front cover, and, while rocking it slightly, observing for excessive play.

b. Two vendors produce the spread system assembly bracket (Figure 4-2). One vendor, Ramcel, makes the bracket with a retainer aera which is not bent. The other vendor makes the bracket with a bent retainer aera. Most of the loose front cover problems occur with the bent retainer aera. Therefore, a simple solution is to replace the front cover or a spread system sub- assembly with one containing a Ramcel spread roller bracket. However, before doing this, try the repair procedure called out in paragraph c. below. (Do not scrap the original front cover since it is still usable on other cameras.)

c. If a Ramcel bracket front cover is not available, use the following procedure to correct the loose front cover.

(1)Open the front cover.

(2)Remove the gear train cover.

(3)With the la tch depressed, use needle-nose pliers to bend the knife edge of the latch inboard (away from the front cover) slightly less than 90°, as shown in Figure 4-3.

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 3rd idler gear.

(6)Observe that the stop pin (Figure 4-3) is not resting on the outer plate when the front cover is closed. When resting on the outer plate, the latch/front cover closing system will loosen from wear in a short time. Make the following observation :

●Open the front cover and note the location of the front cover latch decal (arrow).

●Close the front cover & note the decal location. The decal arrow should be closer to the bottom cover (Figure 4-4). If not, it is an indication of front cover looseness which should be corrected.