Xerox M20 - WorkCentre B/W Laser, Service Manual

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December 2006
3-16 WorkCentre M20, 4118, FaxCentre 2218 Family
IQ13, IQ14
Image Quality
IQ13 Partial Blank Image (Not Periodic) RAP
Use this RAP when the printed sheets have blank areas, not forming a regular pattern.
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. 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.
IQ14 Partial Blank Image (Periodic) RAP
Use this RAP when the printed sheets have blank areas that form a regular, or repeated, pat-
tern.
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. Measure the distance between the image and the defect. Refer to Table 1 to determine
the possible cause of the defect. If the cause of the defect is identified, install new compo-
nents as necessary.
Table 1 Defect distance
Defect distance Roller Component Parts List Ref.
94.3mm ELA - OPC unit drum P/O ELA Unit - OPC drum
set PL 9.10 Item 1
38.3mm Charge roller P/O ELA Unit - OPC drum
set PL 9.10 Item 1
43.8mm Supply roller P/O ELA toner unit set PL 9.10 Item 2
54.3mm Developer roller P/O ELA toner unit set PL 9.10 Item 2
51.9mm Cleaning roller P/O ELA toner unit set PL 9.10 Item 2
56.6mm Transfer roller Transfer roller PL 8.13 Item 10
82.6mm Heat roller P/O ELA HOU - fuser
assembly PL 10.15 Item 1
91.1mm Pressure roller P/O ELA HOU - fuser
assembly PL 10.15 Item 1