Xerox WorkCentre Pro 657 User manual
Maintaining the Machine
14-38 Document WorkCentre Pro 635, 645, 657
Cleaning the Components as Needed
Dirt or dust gather in the machine and can cause the machine to print
incorrectly. The following lists the parts to clean and how the dirt can
affect the print quality.
•Contacts— These groups of contacts are located under the
Developer Assembly. Dirt or dust on the contacts causes the
printer to blur characters.
•Metering Blade— The Metering Bade is located above the black
toner roller on the Developer Assembly. Dirt between the magnet
roller and the metering blade causes the machine to print vertical
lines.
•Document Scanner— The Document Scanner is located on the
underside of the Control Panel.
•Scanner Rollers and Retard Pad— The Scanner Rollers and
the Retard Pad are parts of the automatic document feeder inside
the scanner.
Maintaining the Machine
Document WorkCentre Pro 635, 645, 657 14-39
Use the following procedure to clean the additional components:
1. Grasp the Top Cover Open Lever and open the Top Cover.
WARNING
Do not touch the fuser housing inside the machine. The fuser
housing is extremely hot while the machine is operating.
Top Cover
Open Lever
Top Cover
023
Maintaining the Machine
14-40 Document WorkCentre Pro 635, 645, 657
CAUTION
Always hold the Developer Assembly by the green
handles. Do not touch the green drum area or the
black roller. Do not leave the Drum Unit out of the
machine for an extended period.
Touching the drum or exposing the Drum Unit to light
could lower the print quality.
2. Remove the Developer Assembly from the machine. The
following figure shows how to remove the Developer Assembly.
3. Place the Developer Assembly on a level surface.
Developer Assembly
065
Maintaining the Machine
Document WorkCentre Pro 635, 645, 657 14-41
4. Separate the Drum Unit from the Developer Assembly. The
following figure shows the Drum Unit and the Developer
Assembly.
5. Place the Drum Unit on a level surface. Cover the Drum Unit with
a clean cloth to protect the unit from exposure to light.
Drum Unit
Developer Assembly
098
Maintaining the Machine
14-42 Document WorkCentre Pro 635, 645, 657
To clean Contacts
6. Use a cotton swab to clean the silver contacts in the machine.
Contacts are located inside the chassis in the front, on the right,
and in the rear. The following figure shows the locations of the
contacts.
086
Front
084
Right Side
Maintaining the Machine
Document WorkCentre Pro 635, 645, 657 14-43
To clean the Metering Blade
7. Use the Mylar Scraper to scrape off the toner between the
metering blade and the black toner roller on the Developer
Assembly. The following figure shows how to clean the Metering
Blade.
085
Rear
Mylar Scraper
Metering Blade
098
Maintaining the Machine
14-44 Document WorkCentre Pro 635, 645, 657
8. Position the Drum Unit with the green drum surface facing the
black toner roller on the Developer Assembly. Without touching
the green drum surface, hook the Drum Unit to the Developer
Assembly. The following figure shows how to join the Drum Unit
and the Developer Assembly.
9. Holding the Developer Assembly by the green handles, align the
three shafts on the Developer Assembly sides with the slots in the
machine frame. Lower the assembly into the machine.
Drum Unit
Developer Assembly
026
Developer Assembly
027
Maintaining the Machine
Document WorkCentre Pro 635, 645, 657 14-45
The following figure shows how the shafts on the Developer
Assembly align with the slots.
028
Maintaining the Machine
14-46 Document WorkCentre Pro 635, 645, 657
10. Press firmly on the green squares on the Drum Unit until the
Drum Unit clicks into place. The following figure shows how to
press the Drum Unit into place.
11. Close the Top Cover. Press down the Top Cover until a "click" is
heard to ensure the cover is closed.
Drum Unit
029
Top Cover
101
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