Iq15 Different Image Density (Left And Right) Rap; Iq16 Horizontal Bands Rap - Xerox WorkCentre M20 Service Manual

IQ15 Different Image Density (Left and Right) RAP

Use this RAP when the printed sheets have different areas of image density across the pro-
cess direction. An example is shown in Figure 1.
Figure 1 Image density
Procedure
WARNING
Switch off the electricity to the machine. Disconnect the power cord from the customer
supply while performing tasks that do not need electricity. Electricity can cause death or
injury. Moving parts can cause injury.
NOTE: If necessary, refer to GP 20 for the acronym list and cross reference lists of more com-
monly recognised part names.
Perform the following:
1. The transfer roller pressure may be unbalanced. Check the spring pressure at each end,
PL 8.13 Item 3 and PL 8.13 Item 7. Install new components as necessary, PL 8.10.
2. Shake the ELA - toner unit set to evenly distribute the toner. Go to GP 1. Engine Test
Mode Entry. Perform the Toner State test (test 4). If necessary, install a new ELA - toner
unit set, PL 9.10 Item 2.
3. Go to GP 3, Service Mode Entry. Scroll to System Admin Tools/Maintenance. Perform the
Clean Drum routine. If necessary, install a new ELA Unit - OPC drum set PL 9.10 Item 1.
4. Go to GP 3, Service Mode Entry. Scroll to System Admin Tools/Maintenance. Perform the
Adjust Shading procedure. If the Shading Test fails, install new components as neces-
sary:
NOTE: . Refer to GP 6 Maintenance for additional information about the shading test.
• ELA HOU - CCD module, PL 14.11 Item 16.
• CBF signal - CCD FFC, PL 14.11 Item 17.
• ELA HOU - scanner assembly, PL 14.10 Item 1.
• PBA main (M20F), PL 1.10 Item 4.
• PBA main (4118), PL 1.15 Item 9.
• PBA main (2218), PL 1.20 Item 9.
5. If necessary install a new ELA - toner unit set, PL 9.10 Item 2.
WorkCentre M20, 4118, FaxCentre 2218 Family

IQ16 Horizontal Bands RAP

Use this RAP when the image has bands appearing across the process direction. An example
is shown in Figure 1.
Figure 1 Horizontal bands
Procedure
Switch off the electricity to the machine. Disconnect the power cord from the customer
supply while performing tasks that do not need electricity. Electricity can cause death or
injury. Moving parts can cause injury.
NOTE: If necessary, refer to GP 20 for the acronym list and cross reference lists of more com-
monly recognised part names.
Perform the following:
1. Check the high voltage spring contacts in the PMO - housing terminal MC2, PL 4.15 Item
2 and clean if necessary. Check that the contact is good.
2. Go to GP 3, Service Mode Entry. Scroll to System Admin Tools/Maintenance. Perform the
Clean Drum routine. If necessary, install a new ELA Unit - OPC drum set, PL 9.10 Item 1.
3. If the defect is 5-7mm wide and 125mm from the lead edge, perform the following:
a. Remove the ELA HOU scan upper assembly, PL 14.10 Item 2.
b. Make sure that the cover M CCD cable, PL 14.11 Item 15 is locked in position cor-
rectly.
December 2006
3-17
WARNING
Image Quality
IQ15, IQ16