Xerox DocuColor 12/DCCS50, Service Manual

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4-203 DocuColor 12/DCCS50
ADJ 9.1.8, ADJ 9.1.10
Repairs and Adjustments
Reissue
ADJ 9.1.8 Color Balance Setup (dC919: Copier/Printer)
Purpose
To set the system highlight densities and highlight gray balance.
NOTE:
1. This function should be done when the customer has requested further adjustment of low
end density reproduction.
2. Before executing this function, the dC918 Highlight Setup ( ADJ 9.1.5 ) must be done cor-
rectly.
Adjustment
1. Enter the PWS Diag. Screen for dC919 (IIT machines only).
2. Place the Color Test Pattern on the Platen Glass.
3. Select Start .” (The output copy is in Photo/Halftone mode at Normal L/D.)
4. Visually check the 20% densities on the output copy against the 20% densities on the pat-
tern.
a.
If necessary, adjust the Y,M,C,K density levels so that the densities on the copy
match the densities on the test pattern or the customer preference, using the + but-
tons. (Increasing the value increases the density.)
b. Select Save .”
5. Repeat steps 3 and 4 as necessary.
NOTE: For 20% gray balance, match the Y, M, and C patch densities and let the gray be an
outcome. The gray patch on the dC 919 copy should not exactly match the gray patch on the
test pattern. Compare the gray patch on the dC 919 copy with the drawer/shipping sample, if
available. Adjustments to dC 919 affect all modes. The grays will look different in different
modes. If dC 919 is adjusted based on the Photo/Halftone output, check the output from the
other modes (Text, Photo, etc) to be sure that the gray is acceptable.
ADJ 9.1.10 IOT Registration Series (dC129)
Purpose
The purpose is to adjust the position of the image on the page. This is done by changing the
value in the appropriate NVM location in dC129. This controls where the ROS writes the
image.
Introduction
This series consists of 3 procedures:
Lead Edge Registration for all Paper Trays
Side Edge Registration for Paper Trays 1 - 6
Side 2 Registration for Duplex Tray
All procedures must be checked.
Lead Edge Registration (all Paper Trays)
Purpose
NOTE: There is only one lead edge setting for the paper supply. The Duplex Tray has a sepa-
rate setting for second-side lead edge.
To correctly set the lead edge of the image in relation to the edge of the paper.
Check
1. Launch the DC12 / DCCS 50 Diagnostic Tool. Select dC129 from the DC Quick menu
2. Select Start Data Read to read the NVM values for this adjustment.
NOTE: Do not use Tray 5 (MSI) to set Lead Edge Registration.
3. When the Data Read is done, select a paper tray from the Tray/Size menu. If possible,
use a tray that contains the largest paper used by the customer.
4. Enter 3 into the Print Count: box, and click on Start .
5. Skew Check:
Compare the second print to Figure 1. If the skew is out of spec, go to the IQ3 RAP.
Resolve the cause of the skew before proceeding with this adjustment.