Ricoh Pro 8320 - Lookup Table for Calculating Absolute Humidity

2.Image Quality Problems
669
With 2by2 or 4by4 halftone images, the density becomes uneven at the open gaps [A] on the
development unit and [B] on the drum cleaning unit.
 Depending on whether the temperature rises or falls, the density of a certain part can become
higher or lower.
 Differences in temperature and humidity between the open and closed spaces around the
circumference of the drum can cause fluctuations in the charge potential after exposure.
 This problem tends to occur where humidity is low.
Solution
1. Is the absolute humidity above 2.6? (The absolute humidity in the lookup table below is calculated
from the temperature and relative humidity.)
Yes
Consult the product specialist.
No
Go to the next step.
2. Can the ambient temperature and humidity be adjusted?
Yes
Go to the next step.
No
Consult the product specialist.
3. Raise the temperature so that absolute humidity is above 2.6.
4. Adjust ambient conditions so that the work site is above 15°C (59°F) 30% rH.
5. Print the image. Is the problem resolved?
Yes
Finished.
No
Consult the product specialist.
Lookup Table for Calculating Absolute Humidity
Absolute humidity is calculated from ambient temperature and relative humidity based on the lookup
table below. The areas within the heavy red line in the table below indicate values where quality is
assured. To prevent uneven image density, absolute humidity should be above 2.6 within the red
shaded areas.