Ricoh pro c901 - Page 323

Technical Bulletin PAGE: 7/7
Reissued: 4-Aug-15
Model: Aries-P1.5/C1.5
Date: 27-Jan-12
No.: RM077072d
A) Increasing the toner refresh threshold
1. Make sure that the value of SP3-701-009 (Toner refresh mode: Max Pattern Length) is
25. (If this SP is set to a value other than 25, change it to 25.)
3-701
009
Toner Refresh Mode: Max Pattern
Length
25
2. Apply the modified values indicated in the yellow areas in the table below for SP3-701-
001~008 (Toner refresh mode: Image area ~ Image area thresh).
SP
Default
K: 5%
Col: 2.5%
Modified
K: 5%
Col: 3.8%
3-701
*Note
001
Toner Refresh Mode: Image Area: K
12.5
12.5
002
Toner Refresh Mode: Image Area: C
6.0
9.4
003
Toner Refresh Mode: Image Area: M
6.0
9.4
004
Toner Refresh Mode: Image Area: Y
6.0
9.4
005
Toner Refresh Mode: Image Area
Thresh: K
12.5
12.5
006
Toner Refresh Mode: Image Area
Thresh: K
6.0
9.4
007
Toner Refresh Mode: Image Area
Thresh: K
6.0
9.4
008
Toner Refresh Mode: Image Area
Thresh: K
6.0
9.4
* Note: SP3-701 sets the Vtref threshold for high humidity environment.
B) Increasing the Vtref lower limit
Apply the modified values indicated in the yellow areas in the table below for SP3-004-
005~008 (Vtref lower limit).
SP
Default
Modified
3-004
005
Vtref: Lower: K
1.4
2.0
006
Vtref: Lower: C
1.4
2.0
007
Vtref: Lower: M
1.4
2.0
008
Vtref: Lower: Y
1.4
2.0
NOTE
If you encounter a high toner density error (SC364~SC367) as a result of modifying
Vtref, check the Vt values applied in SP 3-001-001~004. Repeat Procedure 1 until Vt
achieves a value greater than 2.0V, then reapply the modified Vtref values.
C) Decreasing the target development gamma
Apply the modified values indicated in the yellow areas in the table below for SP3-561-
010~012 (Development gamma initial value).
SP
Default
Modified
3-561
010
Dev gamma: Initial value: C
1.5
1.3
011
Dev gamma: Initial value: M
1.5
1.3
012
Dev gamma: Initial value: Y
1.5
1.3