Epson AcuLaser C8500 Service Manual page 473

EPSON AcuLaser C8500
Picture quality FIP covers the following typical problems involving picture
quality:
FIP-3.1
FIP-3.2
FIP-3.3
FIP-3.4
FIP-3.5
FIP-3.6
FIP-3.7
FIP-3.8
FIP-3.9
FIP-3.10
NOTE: Roll diameter and print interval that affect picture quality are
as follows.
Table 5-4. Roll Diameters and Print Intervals
Part
Same period /
Magnet Roll
Same period /
Drum
Same period /
BCR
Same period /
1ST BTR
Same period /
BACK UP ROLL
Same period /
2ND BTR
Same period /
HEAT ROLL
Same period /
PRESSURE ROLL
Same period /
FEED ROLL
Troubleshooting
FIP-1.P1 "Too Light"
Diameter Cycle
π
28 mm
π
264 mm
π
44 mm
π
59 mm
π
88 mm
π
88 mm
π
119 mm
π
117 mm
π
90 mm
FIP-3.1 Too Light FIP-3.1 Too Light FIP-3.1 Too Light FIP-3.1 Too Light
White
The picture image has a white streak in the paper transport direction or is
too light.
*Initial check
Use of parts of incorrect specifications, improper mounting, damage,
distortion, dirt, adherence of foreign matter?
*Main parts to check
DRUM CARTRIDGE, HVPS, ROS ASSY, MCU PWB, HEAT ROLL,
PRESSURE ROLL, MAIN FUSER ASSY
Ite
m
Faulty electrification
1
Occurs when DRUM CARTRIDGE is
replaced?
Faulty ROS ASSY
2
Still occurs when laser radiation exit of
ROS ASSY is half covered with paper?
Faulty HEAT ROLL/PRESSURE ROLL
Is the HEAT ROLL/PRESSURE ROLL
3
damaged? Is there dirt or foreign
matter adhering to the HEAT ROLL/
PRESSURE ROLL?
Faulty Developer Assy
4
Is the trimmer cap of the Developer
Assy of the concerned color clogged?
Picture Quality FIP
Description / initial check
Treatment (when there is a
Check
problem)
Replace DRUM
CARTRIDGE.
Check "Faulty ROS ASSY."
Replace or clean the HEAT
ROLL/PRESSURE ROLL.
Replace the Developer
Assy of the concerned
color.
Revision C
5-121