Problem-solve diagrams
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Repetitive image defects
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Interface ports
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DC controller PCA
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Major components
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Solenoid, sensors, and motors
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Rollers
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PCAs
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Timing diagram
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Circuit diagram
Repetitive image defects
If the product output has a consistent, repetitive defect, use the table in this section to determine which
part needs to be replaced based on the measured distance between the repetitions of the defect.
Repetitive defects for the ITB normally appear on every other page, because the ITB is longer than a
page. However, the period of the repetitive defect can vary depending on the type of media, and a
repetitive defect can occur more than once on the same page.
NOTE: The following table replaces the graphical repetitive defect ruler. You can make your own ruler
by using these measurements.
Table 7-1 Repetitive image defects
Distance between identical defects Component Notes
22.3 mm ( 0.87 in) Developer roller (one rotation) Appears in a single color plane
26.7 mm ( 1.05 in) Charger roller Appears in a single color plane.
28.5 mm ( 1.12 in) Developer RS roller (one rotation) Inside developer, it and removes and
supplies toner to the developer
sleeve.
44.0 mm ( 1.73 in) Registration roller
56.5 mm ( 2.22 in) Fuser film (one rotation) Appears in all color planes
56.8 mm ( 2.23 in) Fuser pressure roller (one rotation) Appears in all color planes
57.0 mm ( 2.24 in) Transfer roller Appears in all color planes
69.0 mm ( 2.71 in) Cartridge-to-cartridge spacing Distance between each color OPC.
75.8 mm ( 2.98 in) OPC drum (one rotation) Appears in a single color plane and
might be either a dark or white spot.
633.6 mm ( 24.94 in) ITB Because the ITB is longer than a
page, you might have to look at
multiple pages to determine if a
repetitive defect is present.
160 Chapter 7 Problem solve ENWW
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