Xerox DocuColor 12/DCCS50, Service Manual

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1/05
3-4 DocuColor 12/DCCS50
IQ 1 Image Quality Troubleshooting Entry RAP, IQ
Reissue
Image Quality
3. If you can identify the defect by name, go to the IQ 2 Defect Listing .
4. If you are not sure what the defect is, or if you prefer, use the IQ Isolation RAP to isolate
your image quality problem.
IQ Isolation RAP
Procedure
The defect occurs only in the Print Mode.
Y
N
The defect occurs only in the Copy Mode.
Y
N
The defect is present in both modes. Print test patterns 99, 101, and 103 from the
PWS.
The defect is present
Y N
Replace the VSEL Base TTL PWB ( PL 9.2 ).
Go to the IQ 5 Xerographic Subsystem Checkout Procedure .
Print test patterns 22, 23, and 30 from the PWS. The defect is present.
Y N
Print test patterns 20 and 21 from the PWS. The defect is present.
Y N
Print test patterns 1 through 10, 13, 17, and 53 from the PWS. The defect is
present.
Y
N
Clean the optics (refer to Cleaning Procedures in Service Call Proce-
dures).
Reprint test patterns 1 through 10, 13, 17, and 53 from the PWS.
The
defect is present.
Y
N
Go to Final Actions in Service Call Procedures.
Replace the CCD PWB ( PL 3.2 ).
Replace the Pre-IPS PWB ( PL 3.5 ).
Replace the MEM SYS PWB ( PL 3.5 ).
Replace the Post-IPS PWB ( PL 3.5 ).
Go to the IQ 5 Xerographic Subsystem Checkout Procedure .
Place the Color Test Pattern on the glass Select Photo Mode . Make a copy. The defect is
present.
Y
N
Replace the following as required:
•
VSEL Base TTL PWB ( PL 9.2 ).
• VSEL Extension PWB ( PL 9.2 ).
• If the machine is a DCCS50, go to the IQ 7 IDFE / Network Checkout Procedure .
• If the machine is a DC12 with DFE, check the DFE and DFE cables.
Print test patterns 99, 101, and 103 from the PWS. The defect is present.
Y N
Replace the VSEL Base TTL PWB ( PL 9.2 ).
Go to the IQ 5 Xerographic Subsystem Checkout Procedure .
Text Image Separation/Mosaic Description - (Mosaic): An image defect that can affect fine
line ladders or low screen halftones. 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 character in a text to look like it
contains small dark dots. (Note: This level of detail is best
observed with an eye loop.)
IQ 34 Text / Image Separation RAP
Three Color Toner Explosion Description - Cyan toner particles surrounding black text and
lines run in three color mode.
IQ 21 Blurred or Fuzzy Image RAP
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).
IQ 35 Toner Starvation RAP
IQ 47 ATC Sensor RAP
Table 1 DEFECTS THAT REQUIRE ADDITIONAL COUNTERMEASURES
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