Countermeasures; Image Faults; Out Of Focus; Color Misalignment - Canon LBP5000 Series Service Manual

5.1 Countermeasures

5.1.1 Image Faults

5.1.1.1 Out of Focus

5.1.1.1.1 Color Misalignment

LBP5000
Image Sample
Probable cause
When the toner level is low or the photosensitive drum is deteriorated, a de-
fective image "color misalignment" may occur.
Servicing work
In the printer driver, execute "calibration" and set "No" to gray correction,
following the procedures mentioned below. When the color misalignment is
not eliminated, clean the color misalignment sensor.
1. Calibration
1)Å@Activate the Status window from the printer driver.
2)Å@In the option menu in the Status window, select "Utility" and click
"Calibration".
3)Å@Press the OK button.
2. Use Pure Black
1) Select the "Quality" page in the printer driver.
2) In "Quality" in the page, click the "Settings" button.
3) Set "No" to Use Pure Black.
3. How to clean the color misalignment sensor
Wipe the sensor surface with a material such as lint-free paper dampened
with alcohol.
Do not wipe the sensor surface with a dry cloth. If you do so, the sensor sur-
face becomes charged and it causes stray toner.

5.2 MEASUREMENT AND ADJUSTMENT

5.2.1 Test Print

5.2.1.1 Test Print
LBP5000 / LBP5100
This test print is conducted in order to check if the printer engine works nor-
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mally.
When the printer is in stand-by mode, a sheet with test pattern (horizontal
lines) can be output if pressing the test print switch on the DC controller PCB
at the back side of the printer.
Accessing the Test Print Switch
1) Remove the rear cover [1].
- 2 screws [2]
- 3 claws [3]
2) Remove the plate [1].
- 1 screw [2]
[1]: Test print switch
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Chapter 5
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