multiple color patches on printed pages

[sgr_100]

Hello,

Multiple color patches appear on printed pages 

I tried troubleshooting suggested by people here and tried below things

1. Ran 4-5 cleaning cycles

2. Changed each cartridge one by one to confirm if the problem was because of cartridge

3. Checked network settings 

4. Cleaned transfer belt 

5. Checked calibration 

None of these worked for me. I still see color patches on printed pages. Attached cleaning page and diagnostics page.

Appreciate the help!

thanks in advance

[John_Getzke · Accepted solution]

See the repetitive defect ruler for your printer model:

(this is a copy/paste from the m477 troubleshooting manual)

Print quality troubleshooting guide
Repetitive defects ruler

When troubleshooting the source of some print image defects, one solution is to identify if it is a repetitive
defect (does the print quality defect appear multiple times on the printed page?). If this is the case, use a ruler
to measure occurrences of repetitive image defects to help solve image-quality problems. For more
information, see Use a ruler to measure between repetitive defects on page 156.
Use a ruler to measure occurrences of repetitive image defects to help solve image-quality problems. Place
the ruler next to the ƭrst occurrence of the defect on the page. Find the distance between identical defects
and use the table below to identify the component that is causing the defect.
NOTE: Do not use solvents or oils to clean rollers. Instead, rub the roller with a lint-free cloth. If dirt is
difficult to remove, rub the roller with a lint-free cloth that has been dampened with water.

Table 2-29 Repetitive image defects
Distance between identical defects Component Notes
22.6 mm (0.89 in) Developer roller Appears in the form of dropouts.
23.6 mm (0.93 in) Primary charging roller Appears in the form of dropouts.
29.6 mm (1.17 in) RS roller
35.0 mm (1.38 in) Intermediate transfer belt (ITB)
assist roller
50.0 mm (1.97 in) Secondary transfer roller Appears in the form of dropouts or dirt on the back of the
page.
50.0 mm (1.97 in) Large assist roller
57.0 mm (2.24 in) Fuser rollers (3) Appears in the form of dirt (front or back of page) or loose
toner.
63.0 mm (2.48 in) Photosensitive drum Appears in the form of dirt or dropouts.
63.0 mm (2.48 in) Tension roller
75.0 mm (2.95 in) Scale
78.0 mm (3.07 in) Cartridge station
78.0 mm (3.07 in) Intermediate transfer belt (ITB)
drive roller
712.0 mm (28.03 in) Intermediate transfer belt (ITB)
length
NOTE: The primary charging roller, photosensitive drum, and developer roller cannot be cleaned. If any of
these rollers are indicated, replace the toner cartridge.

[sgr_100]

Thank you!

I measured the distance between the patches and looks like it is Fuser issue