Ricoh Pro C901 Technical Bulletin page 323

Reissued: 4-Aug-15
Model:
Aries-P1.5/C1.5
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
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).
3-701 001
*Note
002
003
004
005
006
007
008
* 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).
3-004 005
006
007
008
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).
3-561 010
011
012
echnical
T
Toner Refresh Mode: Max Pattern
Length
SP
Toner Refresh Mode: Image Area: K
Toner Refresh Mode: Image Area: C
Toner Refresh Mode: Image Area: M
Toner Refresh Mode: Image Area: Y
Toner Refresh Mode: Image Area
Thresh: K
Toner Refresh Mode: Image Area
Thresh: K
Toner Refresh Mode: Image Area
Thresh: K
Toner Refresh Mode: Image Area
Thresh: K
SP
Vtref: Lower: K
Vtref: Lower: C
Vtref: Lower: M
Vtref: Lower: Y
SP
Dev gamma: Initial value: C
Dev gamma: Initial value: M
Dev gamma: Initial value: Y
ulletin
B
Date:
27-Jan-12
25
Default
K: 5%
Col: 2.5%
12.5
6.0
6.0
6.0
12.5
6.0
6.0
6.0
Default
1.4
1.4
1.4
1.4
Default
1.5
1.5
1.5
PAGE: 7/7
No.:
RM077072d
Modified
K: 5%
Col: 3.8%
12.5
9.4
9.4
9.4
12.5
9.4
9.4
9.4
Modified
2.0
2.0
2.0
2.0
Modified
1.3
1.3
1.3