Ricoh MPC6503SP

Symptom

White or black spots appear when printing halftone images in low-temperature, low-humidity environments (10C/15%) immediately after the developer is replaced.

Note:
• Black spots occur more frequently when printing onto coated paper.

Cause

Some carrier particles inside newly-installed developer have a relatively high electrical potential. These particles may be transferred to the OPC in non-image areas as well, and then fall off before image transfer. As a result, a white spot is developed on the image. If these carrier particles are transferred to the ITB, toner around the carrier drops off, forming a black spot.

Solution

Do the following.

Pro C5200S/C5210S:

Execute “Adjust Image Density” (0201-01) inside the Skilled Operator Settings.

Note:
• This is effective when the development gamma is low (about 0.8 or less) or the OPC electric potential is high, such as in low-temperature, low-humidity environments.

MP C6503/C8003:

Execute “Density Adjustment Process Control” by tapping the following buttons: [User Tools] icon -> [Machine Features] -> [Management] – [Auto Color Calibration].

Note:
• This is effective when the development gamma is low (about 0.8 or less) or the OPC electric potential is high, such as in low-temperature, low-humidity environments.
• After you do this, color calibration is optional.
Execute SP3-011-002 ([Manual ProCon :Exe] - Density Adjustment).