Xerox 8850 Service Manual page 30

30K ft. Clean the inner module components.
9Km
NOTE: 1. Ensure that the vacuum does not contact the edge of the cleaner blade that touches
the surface of the Drum.
NOTE: 2. Raise the Drum/Cleaning Module to dust the Drum and the cleaning blade with zinc
stearate to prevent the charge scorotron from being contaminated. Remove the Erase Bar to
prevent it from being contaminated. The zinc stearate may contaminate the charge scorotron
and Erase Bar and cause print quality defects.
NOTE: 3. Install the complete cleaning blade kit when installing a new Drum.
INTERVAL TASK
Normal Call Replace the Fuser Heat Roll at failure. Smooth or worn Fuser Heat Roll loses ability to drive
Normal Call Check the Fuser Heat Roll for lack of
oil.
Normal Call Inspect/clean the thermistor pad
Normal Call Clean the under side of the Fuser Mod-
ule and Sheet Feed Pinch Rolls.
Normal Call Check and clean or replace the Strip-
per Fingers.
Clean the Media Guides.
INTERVAL TASK
Normal Call Clean the lower paper transports, turn-
around baffle, Sheet Feed Rolls.
Normal Call Vacuum clean the Bias Transfer Roll
(BTR).
125K ft. Replace the Bias Transfer Roll (BTR). Prevent print quality defects due to a worn roll.
42Km
Normal Call Check / repair BTR spacing wheels as
required.
Normal Call Check and clean or replace the Detack
Corotron Media Shields.
Service Call Procedures
Maintenance Procedures
Table 2 Drum/ Cleaner Module
If the customer is running a high percentage of vellum,
outgassing of the vellum contaminates the cleaner
auger and lower baffle surface resulting in poor clean-
ing and high dirt contamination.
plugged cleaner auger
Table 3 Fuser Module
REASON
media.
Too little oil can cause media handling and offsetting
print quality problems.
Contamination can cause fuser heat problems.
Reduce the airborne contaminants.
Bent Stripper Fingers may cause feed out jams and
Fuser Heat Roll damage.
Contaminated or damaged media guides can cause
print quality defects.
Table 4 Media Transport and Lower Sheet Feed Assembly
REASON
Contaminates can cause the media to slip resulting in
print quality defects.
Improve toner transfer to media.
Contaminated, dirty or worn spacing wheels or Drum
ends cause print quality defects.
Contaminated or damaged Media Shields may cause
media jams.
03/2003
1-14
Remove the Drum to enable access.
NOTE: Use caution not to touch or damage cleaning blade or seals.
Vacuum the Module and Auger and then clean all contaminated areas with
Film Remover.
TASK ENABLER
Check/Adjust the Fuser Temperature (ADJ
Check remaining fuser web life [1034] and adjust the Web Oiler rate [1032].
If the Fuser Heat Roll is dry, refer to BSD
Clean the thermistor pad with a brush or dry lint free cloth.
Wipe down with a lint free cloth and antistatic fluid.
Replace the damaged or contaminated Stripper Fingers.
TASK ENABLER
Clean the transport with antistatic fluid and a lint free cloth.
Clean the Sheet Feed Roller with Formula A.
Rotate the Bias Transfer Roll in place as you vacuum. Clean loose toner/
debris with a vacuum. Just lightly touch the BTR as you move the vacuum
tool over the roll, do not press the vacuum tool against the roll. This could
tear and damage the BTR.
Remove the Bias Transfer Roll.
Clean the spacing wheels and the end surface of the Drum that the wheels
ride on.
Clean or replace the damaged or contaminated Media Shields. To clean the
area of the Media Shields, hold a vacuum tool close to the Shields and
brush any contaminates or toner loose for the vacuum to pick up.
Check the stainless steel shield on the rear of the Detack aluminum chan-
nel for a white powder. If a powder is present, replace the stainless shields.
10.1).
10.2.
8850/ 510DP