Xerox DocuColor 12/DCCS50, Service Manual

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1/05
3-17
DocuColor 12/DCCS50
IQ 12 Bands, Lines, Smears, or Streaks RAP
Image Quality
Reissue
Y N
Replace the Cleaner Assembly ( PL 7.1 )
Check the IBT Belt for scratches lines or band. The IBT Belt is good.
Y N
Replace the IBT Belt ( PL 7.5 ).
Choose IOT Test Pattern #11 from the UI, or Test Pattern # 99 from the PWS, and make a
black, yellow, magenta, and cyan print of the test pattern.
The defect appears in all four col-
ors.
Y
N
Replace the Developer for the problem color ( PL 6.6 ). If the problem continues, replace
the Developer Housing ( PL 6.6 ).
• Check the photoreceptor, the corotron wire, and the corotron grid for defects or damage. If
any component is questionable, replace the Drum CRU (
Machine Consumables ).
• Check the Erase Lamp for dark spots. If the lamp is questionable, Replace the Erase
Lamp (
PL 5.1 ).
• Clean the ROS of obstructions or contamination. If the problem continues, replace the
ROS (
PL 4.1 ).
Figure 1 Registration Drive Gear
Table 1 Banding Intervals and Causes
Banding Interval in mm Component
0.51 ROS
1.02 ROS
6.6 Drum Motor ( PL 1.1 ), Main Motor
( PL 1.2 )
39.14 Gears associated with Mag Roll
40.84 Gears associated with Mag Roll
52.78 Gears associated with IBT Roll
105.77 IBT Drive Assy which includes
double-gear 22/64T (
PL 1.1 ),
Drum Idler Gear ( PL 1.1 ), and
IBT Drive Roll ( PL 7.6 )
Table 2 Checks For Other Banding Causes.
Problem to check for Corrective Action
Dirty Drum Gear Clean the Drum Gear
Loose Drum Flange Tighten Drum Flange
Dirty Corotron Wire/Corotron
Grid Clean with brush or replace
Drum CRU
Machine Con-
sumables
Streak on IBT Hard stop to verify. Change
IBT Belt if defective
Streak on back side of copy. Check 2nd BTR Roll for dam-
age or contamination
White deletion streak from
lead edge to trail edge Check for trimmer gap block-
age on developer mag rolls.
Poor Developer Bias Contact Clean/Replace the Bias
Brush ( PL 6.1 )
Table 2 Checks For Other Banding Causes.
Problem to check for Corrective Action
Registration
Drive Gear