Xerox DocuColor 12/DCCS50, Service Manual

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VH/VM Setup (dC933 UI Diagnostics), IOT Highlight
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General Procedures
VH/VM Setup (dC933 UI Diagnostics)
Purpose
Sets the “VG/LD Light Amount”, “Development Bias” and the “ASG Bias Output.”
• From any 2 VGs, set the “VG Value” so that the “Drum Surface Potential” becomes the
“Target VH.”
• From any 3 Light Amounts, set the “LD Light Amount” that is the “Target VM.”
NOTE: Functional comparison between the UI Diagnostics and the PWS Diagnostics.
UI Diag.:
1.
No Target Value displays.
NOTE: This section only describes the Setup in the UI-Diagnostics. For details on PWS-Diag-
nostics, see dC933 VH/VM Setup .
Procedure
1. Enter the UI Diagnostics Mode . Refer to How to Enter/Exit the UI (IOT) Diagnostics .
2. Select Max Setup → VH/VM Setup .
3. Select Start .
4. The system displays the results on the UI.
5. Select Close and return to the “Max Setup Screen.”
IOT Highlight Setup (dC918 UI Diagnostics)
Purpose
Sets the “Hi-Light Density Reproduction Start Points” for K/Y/M/C and “Uniform Hi-Light Den-
sity” for “In-board/Out-board.”
• Visually check the “PG Copy”, adjust the "IOT Reproduction Start Points” for K/Y/M/C Col-
ors (300/600) using the “ASG Bias.”
• Adjust the “IOT IN/OUT Density Difference” for K/Y/M/C colors (common to 300 and 600
lines) using the “ASG Bias” (EOS side).
• Measure the “ASG Bias” and “Highlight Potential” after “In/Out Adjustment”, and set the
“Target Control Value.”
NOTE: Functional comparison between the UI Diagnostics and the PWS Diagnostics.
UI Diag.:
1.
No “Target Value” displays
2. Tray 2 fixed
NOTE: This section only describes the Setup in the UI-Diagnostics. For details, see dC918 IOT
Highlight Setup .
Procedure
1. Enter the UI Diagnostics Mode . Refer to How to Enter/Exit the UI (IOT) Diagnostics .
2. Select Max Setup → IOT Highlight Setup .
3. Check and adjust the In/Out Density Difference .
NOTE: If the paper is “A3” or “A4L”, select 300 .
a. Select “PG Print 300/600”. Select Start . The system prints the checking PG.
b. Visually check the “In/Out Density Differences” for all 4 colors. If there is NO differ-
ence, proceed to Step 4. If there is difference, perform the following steps:
• Select In/Out on the Screen. Select the Color (Y, M, C, K) to be adjusted. Change
the value by using the +/- Button.
NOTE: To darken the density for “Out”, decrease the value.
• Repeat Steps 3-a through 3-b until there is no density difference.
4. Check and adjust the “Hi-Light Density Start Point.”
a.
Select the PG Print 300 or 600 (A4L) . The system prints a “300” or “600” line PG.
b. Visually check the “300” or “600” line PG if Cin 8.6% (for each K, Y, M and C) has
been reproduced and Cin 7.1% is NOT reproduced.
c. Select the mode 300 or 600 to adjust. Select a color (Y, M, C, K) to be adjusted.
Change the value by using the +/- Button.
d. Check the Highlight as described in 4-b. Repeat Steps 4-a through 4-c until the
“High Light” is satisfactory.
5. Select Close and return to the “Max Setup Screen.”
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