Lexmark C520 Series, Service Manual

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Service Manual
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Print quality—blurred or fuzzy print
Blurred or fuzzy print is usually caused by a problem in the EP drive assembly or in the transfer belt assembly.
Check the EP drive assembly and transfer belt assembly for correct operation.
Blurred print can also be caused by incorrect feeding from one of the input paper sources, paper trays, or duplex
paper path.
Check the high voltage spring contacts to ensure they are not bent, corroded, or damaged. Replace as
necessary.
Print quality—half-color page
Print quality—horizontal banding
5 HVPS cable Turn the printer off and check the continuity of the HVPS cable. If
incorrect, replace the cable assembly.
6 HVPS Replace the HVPS. Go to “High volt power supply (HVPS)
removal” on page 4-55 .
7 Printhead Replace the printhead. Go to “Printhead removal” on page 4-52 .
8 System card Replace the system card. Go to “System card removal” on
page 4-47 .
Potential cause Action
1 Photoconductor unit Photoconductor unit is not properly seated. Reseat the specific pho-
toconductor unit.
Potential cause Action
1 Developer cartridge Measure distance between bands. Faulty developer cartridge will
measure either 27 or 36mm between bands.
2 Photoconductor unit Measure distance between bands. Faulty photoconductor unit will
measure 72mm between bands.
Potential cause Action
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