(b) Operate the rack manually and check that it operates freely.
(c) Insert a large piece of previously exposed and processed film into
the entrance side of the rack. Manually feed the film through the rack. The film must be
transported smoothly, without binding or hesitating. If the film is not being transported
properly, look for the area in which the trouble occurs. Examine the area for misaligned
(d) Inspect the film for scratches or marks. Keep in mind that although
the rack may successfully transport the film when dry, it may still cause problems in the
processor. If in doubt, perform the "rack disassembly/reassembly" procedure in Lesson
4, Remove and Replace or Repair Defective Components of X-ray Film Processors.
(e) Clean the rollers of a rack with a damp cloth. Use an AFP pad to
remove stubborn deposits.
Do not use an AFP pad on rubber rollers.
(f) Check the squeegee roller tension. To minimize drying streaks or
water marks on film, slightly increase the tension on the exit squeegee rollers. Do this
by inserting film between the rollers. Tighten the set screws on the rack side plates with
a 5/64-inch Allen wrench until the film just drags on the rollers as you remove the film.
Refer to figure 1-5. Make certain that the squeegee rollers are parallel after you have
made the adjustment. Ensure that excessive drag does not cause the rack to bind.
After making the squeegee adjustment, manually turn the rack worm gear (main rack
gear) by hand. Make certain the lower squeegee roller is being driven. If it is not,
tighten the set screws.
Do not over-tighten the set screws. Over-tightening may bottom out the
screws and bind the gears.
(2) Clean the crossovers. The crossover assemblies fit between the
developer and fix and between the fix and the wash racks. Wipe them with a soft damp
(a) They provide a smooth, curved surface (or shoe) which bends the
film down into the fix rack (from the developer) and into the wash rack (from the fix).
(b) For the film to transport properly through the processor, you must
install the developer and fix crossover assemblies correctly. See Figure 1-2. Make
certain the crossover assemblies fit down on the upper tie rods of the solution racks.
Also ensure that the crossover shoes do not interfere with the operation of the solution
rollers on either side of them. Refer to figure 1-10.