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SUBJECT:
CYAN TONER SCATTERING IN PRINTER MODE
SYMPTOM:
Cyan toner scattered around the text and the edge of solid images in print mode.
CAUSE:
The Pre Transfer Lamp (PTL), which emits red light, is blocked by cyan toner. The electrical potential of the
image area does not drop while the potential on the bare drum surface drops. Therefore, some toner is
attracted to the bare drum surface. VD drops to the bare drum potential level, however VL does not drop to
the same level because the PTL light is blocked by cyan toner (See figure below). The symptom is exhibited
when the amount of toner on the drum, Mass Area (M/A), is too large. The symptom is seen only in the print
mode since the maximum amount of toner on the drum is higher compared to that of the copy mode.
Note:
The A109 has a higher M/A for cyan, therefore the level of cyan toner scattering in the A109 is
less than what may be encountered with the A172/A199.
SOLUTION:
1. The PTL has been changed to emit a stronger red light.
2. The ACC target for the printer mode has been modified to decrease the maximum amount of toner on the
drum. The IPU ROM revision G (file name 5206IP1G.exe), can be downloaded through the BBS system.
NOTE: For more information about the Ricoh Technical Services BBS, order the Guide To Operation
(P/N BBS00001) through normal NSPC Channels.
RICOH GROUP COMPANIES
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