Ii. Image Defects - Canon LBP-3260 Service Manual

CHAPTER 4

II. IMAGE DEFECTS

If the factor of the malfunction is identified as "image defects" by the malfunction diagnosis flow-
chart (Figure 4-1-1), find out the cause of the failure according to the table below and clear the
problem.
• I-1 Light:
• I-2 Dark:
• I-3 Completely Blank:
• I-4 All Black:
• I-5 Dots in Vertical Lines :
• I-6 Dirt on Back of Paper:
• I-7 Vertical Lines:
• I-8 Black Horizontal Lines:
• I-9 Dirt:
• I-10 Blank Spots:
• I-11 White Vertical Lines:
• I-12 White Horizontal Lines:
• I-13 Poor Fixing:
• I-14 Image Distortion:
II-1. Light
<Possible causes>
1. The image density is not adjusted correctly.
Action: Adjust the image density by operating the external device.
2. Open the upper cover and remove the EP-72 cartridge while a print is being made. Open the
drum protective shield of the EP-72 cartridge and check the toner image on the photosensi-
tive drum. If the toner image has not been transferred to the paper properly, go to step 3.
If the toner image on the drum is faint, go to step 6.
Do not open the drum protective shield for more than 10 seconds.
3. The transfer charging roller contact of the high-voltage power supply is not making a good
connection with the contact of the transfer charging roller shaft.
Action: If the contacts are dirty, clean them. If the problem continues after cleaning, or
parts are deformed or damaged, replace them.
4. The transfer charging roller is deformed or has deteriorated.
Action: Replace the roller.
5. The high-voltage power supply PCB is defective.
Action: Replace the high-voltage power supply PCB.
6. The DC controller PCB is defective.
Action: Replace the DC controller PCB.
4 - 8
Table 4-2-1
Output very light image
Output very dark image
Output no image
Output all black paper
Output white dots on the paper
Output dirt on the back of the paper
Output vertical lines on the paper
Output horizontal lines on the paper
Output dirt on surface of the paper
Output image with blank spots
Output white vertical lines on the paper
Output white horizontal lines on the paper
Output the image with poorly fixed toner
Output distorted image