Ricoh Leo-C2/P2, Technical Bulletin

Page: 287 / 308

T
echnical
B
ulletin
PAGE: 1/1
Model:
Leo-C2/P2
Date:
30-Jan-19
No.:
RD0A5039
Subject:
Troubleshooting for Color Shift on the halftone
Prepared by:
H Kawamura
From:
PPCS Section, CIP Product Quality Management Dept.
Classification: Troubleshooting
Mechanical
Paper path Part information
Electrical
Transmit/receive Action required
Service manual revision
Retrofit information
Product Safety Other ( ) Tier 2 Tier 0.5
SYMPTOM
The halftone color shifts during the job
CAUSE
The bug in the firmware related to TRAC (New Image Density Adjustment Function from
ProC 7200)
When adjusting the density for solid image, halftone density is adjusted with it, too.
Where it supposed to adjust separately.
ACTION
Permanent Action: Firmware update : ETA is not fixed yet.
Temporary Action:
1. Upgrade the engine firmware to ver 1.64 or newer.
(This firmware is different from the permanent fix firmware. This firmware contains one
of the necessary SP adjustments, which cannot be adjusted from SP mode)
2. Change the following SP
SP Number Description New value
From 3-233-102 to 3-233-104 PPAT Vtref Corr :Disp/Set :
Corr Amt(Gamma)(+):C, M, Y 0
From 3-233-112 to 3-233-114 PPAT Vtref Corr :Disp/Set :
Corr Amt(Gamma)(-):C, M, Y 0
From 3-233-132 to 3-233-134 PPAT Vtref Corr :Disp/Set :
Corr Amt (TRAC)(+):C, M, Y 0.04
From 3-233-142 to 3-233-144 PPAT Vtref Corr :Disp/Set :
Corr Amt (TRAC)(-):C, M, Y 0.03
From 3-691-042 to 3-691-044 TRAC:Setting
TRAC gain :C, M, Y 0
From 3-691-052 to 3-691-054 TRAC:Setting
TRAC HT gain :C, M, Y 0.75
3-691-070 TRAC:Setting
Slope-rate 100