
The Black Patch monitors the performance of the developer for activity and contamination. There is no upper control limit for Black Patch. If the Black Patch plots are low, then it could be an indication of low developer activity due to underreplenishment or severe oxidation. If the blue Black Patch is very low and separated from the red and green plots, it could be a sign of developer contamination. See prescriptions listed under the LD parameter.
The
Prescriptions:
—Underagitation: call service representative to fix agitation pump on processor.
—Oxidation: check for air bubbles in developer tank; call service technician if seen.
The LD (Speed) monitors the developer activity. Speed is the primary indicator of developer time, temperature, and especially developer replenishment rate. For time that is too long, temperature too high, or overreplenishment, the LD plots will be high. For time too short, temperature too low, or underreplenishment, the LD plots will be low. Check the temperature of the developer; adjust as necessary to bring back into specification. If the plots are extremely out of control, by more than 0.18 density units over or under aim, drain and replace the developer. If the plots are less than 0.18 density units from aim, a prescription can be risked.
Note: If the red LD is very high and/or the green LD is very low and they are split from the blue LD, it may be caused by developer contaminated with
Prescriptions:
— For high LD plots:
Overreplenishment: Remove a volume of developer solution equal to 10% of the total tank volume and replace with water. Repeat until it is in control.
— For low LD plots:
Underreplenishment: Remove a volume of developer tank solution equal to one third of the tank volume and replace with fresh developer tank that is mixed according to the “Make 1 litre” component ratios in Table 1a.
Prescriptions:
—For high
—For a high
10 Using the KODAK EKTACOLOR Processing Cartridge 111 With Digital Minilabs,