Instructions for the CPA-2 and CPP-2 Processors

11. Precautions for Film and Paper Processing

[CPP-2]

In rotary processing, the most frequently seen fault is runs or streaks on film and paper. This effect is caused almost exclusively by water in the tank, drum or reel being carried forward to the next process. This carry-forward affects the contents of the tank or drum before any new solutions reach the film or paper.

Often the first run of the day is fine (the equipment dried overnight). However, the next run may show streaks. The film tank, film reel, paper drum, and the lids, must all be dry before loading them for the next processing run.

For the film tank or paper drum:

1. Disassemble all removable components.
2. Rinse and drain completely.
3. Dry inside and out with paper towel or cloth until there is no visible water remaining either inside or out.

For the tank or drum lid:

1. Disassemble the lid by removing the funnel (except the in 3000 series lids) or beaker. Turn it counterclockwise. Remove the red cap if it is being used.
2. Rinse and drain completely.
3. Dry each piece with a paper towel or cloth until there is no visible water remaining. Shake the lid, or rap it against a towel in the palm of your hand, or counter top. This action will dislodge water droplets that are caught under the red ring of the lid.

For the center core of a film tank:

1. Disassemble the core into its components.
2. Rinse and shake all excess water from inside the cores.
3. Dry the outside of the cores with a paper towel or cloth.

For a film reel:

1. Disassemble the reel into its two halves by twisting counterclockwise past the detent. (Stainless steel reels do not come apart.)
2. Rinse the reel components
3. Rap the reel halves sharply against a towel to dislodge any water droplets from between the spirals.
4. Use a paper towel or cloth to finish drying the reel halves.

Note:

If you have time, any of these items may be left to air dry. Other options are hair dryers (use very low heat), fans, etc. Reels and cores may be put in the bottom of a film drying cabinet to speed drying.

Both film and paper are very sensitive to small quantities of water running across the emulsion. If a drop of water runs across a piece of paper or film before it is pre-rinsed and developed, the droplet area will be easily seen in the finished print or film.

To pre-rinse, pour in all the water quickly, completely covering the paper or film in the drum at one time. This step prevents stray droplets from 'running around' before the pre-rinse.

Rarely, runs across the face of a print or film may be caused by other problems. Almost always a run mark is caused by stray water droplets.

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Go To:

1. Processor Specifications; CPA-2 and CPP-2

2. Safety First

3. Differences Between the CPA-2 and the CPP-2 Processors

4. Processor Description

5. Cleaning the Processor

6. Processor Maintenance and Tips

7. Processing Instructions for Film Using Magnet Drive

8. Processing Instructions for Prints Using Magnet Drive

9. Processing Using the JOBO Lift Accessory

10. Processing Instructions With the JOBO Lift Accessory

11. Precautions for Film and Paper Processing

12. Additional Processing Information

13. Spare Parts

14. Fuse Replacement

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