Iq 3 Geometric Rap - Xerox DocuColor 12/DCCS50 Service Manual

Spots
Description - "Barcode" Marks (or Spots):
barcode symbol that is read by a barcode scanner. The marks usually appear in a group of
four, and each mark is a different primary color arranged in the sequence -- yellow, magenta,
cyan, and black.
Description - All Other Spots: Generally circular in shape, these defects can be caused by an
absence of toner in a desired area, or a deposit of toner in an undesired area.
Solid Area Reproduction
Description - The inability to adequately reproduce a high-density solid area.
Specification - Using Test Pattern 82E8220, the copier should reproduce the 1.0K blocks with
minimal mottle or graininess.
Text / Image Separation Errors
Description - (Mosaic): An image defect that can affect fine line ladders or low screen half-
tones. It causes closely spaced lines, low frequency halftones, and certain texts to have a
blotchy appearance.
Description - Vacant Characters: An image defect that results when the center of a character
is filled-in with a (200R) halftone screen while its outer border is made up of a (600L) text
screen. (Note: This level of detail is best observed with an eye loop.)
Description - Small Dark Dots on Text: An image defect that causes a localized area of a char-
acter in a text to look like it contains small dark dots. (Note: This level of detail is best observed
with an eye loop.)
Toner Starvation
Description - This defect occurs at the transition point between a high density area and a low
density area of the same color. A localized area of the mag brush becomes "starved" for toner
due to development fringe field effects. Starvation tends to worsen at low triboelectric levels
(high toner concentration).
Unfused Copy
Description - The toner on the copy wipes off easily when moderate pressure is applied.
Wrinkled Copy
Description - Creasing or folds on the copy/print in the lead to trail edge direction or closely
spaced 'waves' in the front to rear direction.
Reissue
DocuColor 12/DCCS50
An image defect that has the appearance of a small

IQ 3 Geometric RAP

This RAP is used when Skew, Registration, or Magnification are out of spec.
Initial Actions
NOTE: (W/Tag P39): Misuse of the Expanded Imageable Area feature will cause registration
problems when printing on oversize paper (12 x 18 inch / SR-A3). This feature is available for
DC12 machines only, and requires specific IOT and DFE software and hardware levels. Refer
to GP 2 Increased Imageable Area Setup
Activating this feature on a machine not listed in GP2 will result in an image shift of 0.5 inch (12
mm) or more toward the lead edge of the print when printing on oversize paper. On 12 x 18
inch paper, part of the interimage patch may be visible in the lower left corner of the print.
If this defect is observed, check that NVM locations 720-360 and 720-361 = 0.
This feature can be activated by the customer, using the TOOLS mode. If this has occurred,
inform the customer of the limitations and requirements of this feature.
NOTE: For DCCS50: Check that NVM locations 720-360 and 720-361 = 0.
Load some new, dry 24 lb 11X17/A3 Xerox COLOR Xpressions (NASG), or 90 GSM Colortech
+ (ESG) into each paper tray (use 8.5X11/A4 in Tray 1). Make 3 full color copies from each
paper tray. Mark the appropriate paper tray on these copies.
Procedure
The problem is still present when using the proper paper.
Y N
Explain to the customer that new, dry, 24 lb. Xerox COLOR Xpressions (NASG), or 90
GSM Colortech + (ESG) paper is the specified paper for use in the DocuColor 12 copier.
The Problem occurs only in the Printer Mode
Y N
The defect occurs when the document is manually registered on the platen glass.
Y N
Ensure that the Document Transport Belt is clean. Go to the Document Handler
Adjustment Procedures ADJ 12.1.1
check the DADF drive rolls and pinch rolls for wear or glossing.
The Problem is Skew
Y N
The Problem is MIsregistration
Y N
Perform ADJ 9.1.16
Machine) Adjustment and
System Registration).
Select Pattern IOT #2 Black on the UI or Pattern # 84 Black on the PWS. Misregis-
tration is present on the copy
Y N
Perform ADJ 9.1.10
tion) and ADJ 9.1.15
The defect occurred on copies from all five paper trays.
A B
1/05
3-9
for details.
through ADJ 12.4.1. If the problem continues,
IIT Horizontal Magnification/Vertical Magnification (IIT
ADJ 9.1.10 Side/Lead Edge Registration (dC129:
Side/Lead Edge Registration (dC129: System Registra-
Side Registration.
IQ 3 Geometric RAP
Image Quality