Instructions for the CPA-2 and CPP-2 Processors
12. Additional Processing Information
[CPP-2]
Warm-up Time:
The processor will require 1 hour, 15 minutes to 1 hour, 30 minutes to warm from about 68° F (20°C) to 100°F (38°C).
If you know when you are using the processor for any given day, it can be set up in advance. Chemicals should be put in the processor bottles. Check the water level and fill the trough as necessary. Switches should be set as if you were ready to start warm-up. Set temperature control(s) to desired process temperature. Set rotation motor control to '0' (Off) and ON/OFF switch and the PUMP/HEAT switch to '1' ('On'). The processor is then plugged into an electrical timer (not supplied by JOBO). Set the timer to turn on about 1 or 2 hours before the next time you want to do processing. The processor will be warmed and waiting for your use.
WARNING: The CPA-2 or the CPP-2 Processors require 480 watts at 120 volts. Any timer used must be capable of switching at least that power level, and must be grounded.
Another method of hastening the warm-up of the processor is the introduction of hotter (not over 50°C or 120°F) water into the lower trough. Do it carefully to avoid overfilling the processor. It may be necessary to drain water from the tempering bath to allow room for the water being added. The On/Off switch and the Pump/Heat switch should be on ('1') and the temperature control(s) set. A little practice with this method will allow you to warm the processor rapidly to operating temperature. (Normally the water bath can be ready in 30 minutes or less with this approach.) In fact, the water bath can be up to temperature almost instantly with this approach. The bottles will not heat as rapidly as the water bath. Check the bottles with a thermometer to be sure the chemicals are at the processing temperature.
Timing Process Steps:
Use this procedure to achieve accuracy in timing any process step. Start timing of the step immediately upon pouring into the lift or tank. Start draining the tank (raise lift, if used) so that it will have just finished draining at the end of the step's time. The time you need for draining will depend on the specific tank and the volume of solution you are using. You may want to do a few practice runs with water and no film (or paper) until you get the technique to run smoothly and accurately. As a rough guide, figure about one second for every 100 ml to drain.
Graduates:
The 260 ml (8 oz.) graduates supplied with the processor have colored dots on them. These dots allow rapid identification. It is possible to set up your own code (such as developer in red, stop in yellow, etc.) Each graduate is then used for only one type of chemical. The graduates also may be used to temper rinse water.
Rotation Motor:
While processing, do not shut off the rotation motor. You may be tempted, especially if you are not yet skilled at mounting and dismounting the tanks or drums. Once you have introduced chemicals to a film tank, or turned a paper drum into a horizontal position, processing has started! You must start rotary motion as soon as possible to avoid streaking the film or paper.
Tempering Bath:
The CPA-2 and the CPP-2 Processors use warm water in contact with open air. Foreign organisms may grow in the water bath. One type is algae, and the other is airborne fungus. The open warm water bath provides ideal conditions for either organism to grow. To prevent the growth of these organisms, change the water frequently. A dilute non-chlorinated algaecide used in swimming pools also will work to control growth in the tempering bath. (There are many different brands of non-chlorinated algaecide available; all seem to work quite well.) Periodic use of Processor Clean II #4135 (4.7 lb.) or #4136 (4 oz.) will help prevent growths and remove chemical stains in the tempering bath. Drain the processor after use. Neither algae nor fungus grows well in the cool and dry environment of an empty water bath.
Replenishment:
JOBO tanks and drums require small quantities of chemicals and are well suited to 'one shot' use. However, it is possible to recover your used chemicals for replenishment and reuse, disposal, or for silver recovery. Follow the chemical manufacturers' recommendations if you replenish your chemicals.
Additional Reading:
You may want to subscribe to the JOBO Quarterly (JQ), a publication specifically designed for the JOBO processor user. Each issue is packed with the latest information on new equipment, tips, and processing techniques. Reviews and profiles of JOBO owners offer a varied perspective.
The JQ is available direct from JOBO and at select JOBO dealers.
Back to TopGo To:
1. Processor Specifications; CPA-2 and CPP-2
2. Safety First
3. Differences Between the CPA-2 and the CPP-2 Processors
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