Kodak FC2 Corrective Action and Prescriptions, D-maxb – Yb, First check for operational errors

Additional Process CN-16S

Adjustment Factors for Use with

Process C-41 Control Strips

Step	R	G	B
Yellow	0.00	0.00	0.00
D-max	0.00	0.00	+0.07
HD	+0.04	0.00	+0.07
LD	0.00	0.00	0.00
D-min	0.00	0.00	0.00

4.Process a control strip and measure the Yellow, D-maxb-Yb,HD, LD, and D-min patches.

5.Calculate the variations from aim by subtracting the aim densities from your control-strip densities. Plot

the variations on your control chart. Plot variations that are higher than the corresponding aim values (+ values) above the aim line. Plot variations that are lower than the aim values (– values) below the aim line.

If any of the variations from aim plots beyond the action or control limits, process another control strip. If the second control strip confirms the results of the first strip, determine the cause of the problem. Using the “Visual Process Control Guide” on page 8 provides a good starting place. If the problem is not readily correctable, contact Kodak Service and Support at (866) 352-4367.

USING THE “VISUAL PROCESS CONTROL GUIDE” AND KODAK CONTROL STRIPS TO TROUBLESHOOT PROCESS CN-16S

If your Process CN-16S control chart indicates an out-of- control plot position, use the “Visual Process Control Guide” as follows to troubleshoot the process and apply corrective action.

First check for operational errors:

•Make sure the control-strip code matches the reference-strip code.

•Calibrate the densitometer.

•Re-check the control-strip aims and verify the correction factors.

•Verify the problem by processing a second control strip.

•Determine if any recent processor maintenance could have caused a problem.

•Verify that tank and replenisher solutions were mixed correctly.

•Use an accurate thermometer to verify that the developer temperature and other solution temperatures are correct.

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-Ybindicates 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