Xerox DocuColor 12/DCCS50 Service Manual page 291

Y N
Replace the Cleaner Assembly (PL
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
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
• 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).
Table 1 Banding Intervals and Causes
Banding Interval in mm Component
0.51 ROS
1.02 ROS
6.6 Drum 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
Drum Idler Gear
IBT Drive Roll
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 Clean with brush or replace
Grid Drum CRU
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
Reissue
DocuColor 12/DCCS50
7.1)
(PL 6.6). If the problem continues, replace
(Machine Consumables).
(PL 1.1), Main Motor
(PL 1.1),
(PL 1.1), and
(PL 7.6)
Machine Con-
Table 2 Checks For Other Banding Causes.
Problem to check for Corrective Action
White deletion streak from Check for trimmer gap block-
lead edge to trail edge age on developer mag rolls.
Poor Developer Bias Contact Clean/Replace the Bias
Brush
Figure 1 Registration Drive Gear
1/05
IQ 12 Bands, Lines, Smears, or Streaks RAP
3-17
(PL 6.1)
Registration
Drive Gear
Image Quality