Oki B6500 Service Manual page 132

When an image quality problem occurs, run a test print to clearly define the defect. Next, troubleshoot
using the image quality FIP table accordingly.
If the problem cannot be resolved using the image quality FIP, check again with the image quality FIP.
Next, replace [ESS and possible causes] in order and check, and troubleshoot, using [Chapter 2
Diagnostic].
Image quality FIP states regarding the typical image quality trouble, as follows.
- FIP-1.P1 Faint print (Low contrast)
- FIP-1.P2 Blank print (No print)
- FIP-1.P3 Solid black
- FIP-1.P4 Vertical blank lines (White stripes in paper transport direction)
- FIP-1.P5 Horizontal band cross out
- FIP-1.P6 Vertical stripes
- FIP-1.P7 Horizontal stripes
- FIP-1.P8 Partial lack
- FIP-1.P9 Spots
- FIP-1.P10 Afterimage
- FIP-1.P11 Background (Fog)
- FIP-1.P12 Skew
- FIP-1.P13 Paper damage
When horizontal lines and/or spot occur periodically, it is possibly caused by the
trouble of a particular roll. In this case, measure the trouble interval on the test
print, and check the relation to the roll in the table below. The interval does not
necessarily match circumference of the roll. The trouble may be solved easily by
the check.
Roll
Drum EP CARTRIDGE
BTR
Heat Roll
Pressure Roll
Parts name PL No.
-
BTR ASSY PL8.1
FUSER ASSY PL8.1
FUSER ASSY PL8.1
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Chapter 1 Troubleshooting
Roll diameter (mm) Interval (mm)
30.5
16.2
24.9
30
94.3
50.7
78.3
94.2