Ricoh Taurus-C1a Technical Bulletin page 111

Model:
Taurus-C1/P1 (D074/D075/M044)
Cause
Symptoms "a" and "b" are both caused by the same mechanism.
The non-image area of the drum surface is unable to retrieve a surface potential equal to
the area where the solid image was created after quenching and recharging for the
halftone image to follow.
This occurs when the drum potential is low (= high development capacity). Due to the low
drum potential (insufficient negative charge), charge level of the previously non-image
area becomes too low when the image transfer current is applied.
Chances are higher for these symptoms to occur in the following conditions:
When printing halftone image immediately after printing a solid image
Low temperature and low humidity
Black images; the symptoms tends to occur with Black OPC drum
When applying fresh developer
Action
1. Do SP3011-002 (Manual ProCon: Exe – Density Adjustment)
Print out and check the result. If the problem persists, do the next step.
2. Decrease the power level of the quenching lamps in SP2224 to eliminate residual
charge on the drums.
001 (Standard process speed / Image area)
002 (Standard process speed / Non-image area)
003 (Medium process speed / Image area)
004 (Medium process speed / Non-image area)
005 (Low process speed / Image area)
006 (Low process speed / Non-image area)
Again, print out and check the result. If the problem persists, do the next step.
Possible side effect: Dirty background
3. Decrease the image transfer current for Black in SP2401.
Repeat SP3011-002 and check the result.
SP2401－
005
015
Possible side effects: i) Light image density
T
echnical
SP2204－
Default
33
34
ii) Toner contamination on drum surface
B
ulletin
Date:
02-Nov-11
Default
80% 5%
80%
5%
56% 5%
56%
5%
40% 5%
40% 5%
Set to*
28
(25~50%)
28
(25~50%)
PAGE: 2/2
No.:
RD074030
Set to*
(0~20%)
(0~20%)
(0~20%)
(0~20%)
(0~20%)
(0~20%)