Assessments - 3, GPA: 3
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Facilidade de uso
Match your plots to the “Visual Process Control Guide” to identify the problem: • Match your control plots to the examples given on the “Visual Process Control Guide.” Compare only one plot parameter at a time (D-maxb-Yb, HD-LD, LD, D-min). Note that the pattern of the red, green, and blue plot deviations can be an indicator of different problems. • Write down the problems indicated by each parameter for the plots that are out of control. Consider that you may have more than one problem occurring at the same time. • Consider each potential cause of the out-of-control condition, and verify the operational conditions of the processor. When you have determined the most likely cause(s) of the out-of-control condition, take corrective action to eliminate the cause, and use the prescriptions to eliminate the symptom of the problem. Corrective Action and Prescriptions D-maxb – Yb: This parameter monitors the performance of the bleach solution for retained silver. A bleach solution that is underreplenished or diluted will not efficiently bleach the film, leaving retained silver in higher-density areas. If the D-maxb-Yb indicates a retained-silver problem, confirm it with the following test: 1. Immerse the processed control strip in the bleach tank, and soak it for 7 minutes. 2. Remove the strip, rinse it thoroughly with water for 3 minutes, and dry it. 3. Re-read the strip, re-plot D-maxb-Yb, and compare the new plot to the earlier plot. If the new plot shows a difference of -0.05 density unit or more (lower), it confirms a bleaching problem. If there is no change or less than a 0.05 change, the bleach is not a problem. See the “Visual Process Control Guide” for other possible causes. If the test confirms a bleaching problem, replace the bleach tank solution with fresh solution made from the KODAK Negative Film FC Tank Bleach, as described on page 3. Also check the output of the bleach replenisher pump and calibrate. Be sure that the bleach replenishment rate is set correctly. Using the KODAK Negative Film Processing Cartridges FC1 and FC2 • CIS-254 5 HD-LD (Contrast): This parameter monitors developer activity. Contrast is the primary indicator of developer agitation, oxidation, concentration, or contamination. If the developer tank solution is under-agitated, too dilute, or oxidized, the plots will be low. If the developer tank solution is over- concentrated or contaminated, the plots will be high. If the process is very out of control, i.e., by more than 0.15 density unit over or under aim, replace all of the developer tank solution. If the developer is contaminated, make sure you rinse the tank out thoroughly, and then replace all of the developer tank solution. If the plots are less than 0.15 density unit over or under aim, you can risk a prescription. Prescriptions: • For high HD-LD plots: Overconcentration: Dilute the developer with warm water in an amount equal to 5 percent of the volume in the developer tank. Repeat as necessary until the process is in control. • For low HD-LD plots: Under concentrated (Diluted): Replace developer tank with a tank mix of KODAK Negative Film FC Tank Developer, use mixing instructions on page 2. Under agitation: Call a service representative to fix the agitation pump on the processor. Oxidation: Check for air bubbles in the developer tank, and call a service technician if bubbles are visible. If oxidation is caused by low utilization, see the corrective action in KODAK Publication No. CIS-246, Operating Minilabs at Low Levels of Utilization. This publication is available on the Kodak website at LD (speed): This parameter monitors developer activity. Speed is the primary indicator of problems with developer time, temperature, and especially replenishment rate. For development time that is too long, temperature that is too high, or overreplenishment, the LD plots will be high. For time that is too short, temperature that is too low, or underreplenishment, the LD plots will be low. Check the developer time and temperature, and adjust them to specification. The developer time should be 3:05 ± 0:05; the temperature should be 38 ± 0.2°C. If the plots are very out of control, i.e., by more than 0.12 density unit over or under aim, dump and replace all of the developer tank solution. If the plots are less than 0.12 density over or under aim, you can risk a prescription. Prescriptions: • For high LD plots: Overreplenishment: Replace a portion of the developer tank solution (5.2 litres) with one KODAK Negative Film FC Tank Developer Kit. Check the replenishment rate setting. Check the output of the developer replenisher pump and calibrate. Lower the developer replenishment rate by 10 percent or more if necessary. • For low LD plots: Underreplenishment: Replace a portion of the developer tank (5.2 litres) with one KODAK Negative Film FC Tank Developer Kit. Check the replenishment rate setting, and check the pump output of the developer replenisher pump ...
Este manual também é adequado para os modelos :Impressoras - FC1 (309.64 kb)