Canon imageRUNNER 1643P

Repetitive Image Defects Ruler

Cause of failure		Intervals (mm)	Symptom
			Soiling	White spots	Soiled back	Fixing failure
Cassette Pickup Roller		Approx. 50	Yes	-	-	-
Cassette Separation Roller		Approx. 44	-	-	Yes	-
Cassette Feed Roller		Approx. 50	Yes	-	-	-
Registration Roller		Approx. 43	-	-	Yes	-
Cartridge	Primary Charging Roller	Approx. 28	-	Yes	-	-
	Photosensitive Drum	Approx. 75	Yes	Yes	-	-
	Developing Cylinder	Approx. 31	-	Yes	-	-
Transfer Roller		Approx. 39	-	Yes	Yes	-
Fixing Assembly	Fixing Film	Approx. 75	Yes	Yes	-	Yes
	Pressure Roller	Approx. 63	Yes	-	Yes	Yes

Checking the Amount of Fixing Nip

Although the nip width of the Fixing Assembly cannot be adjusted with this machine, it can be checked. By checking the nip width when fixing failure occurs, it is possible to judge whether there is a problem with the Fixing Assembly. Check the nip width of the Fixing Assembly by the following procedure.

NOTE:
Method to display the test print: It appears in the menu by pressing [Job Status/Cancel] key and [Utility] key simultaneously.

1. 1. Output Test Print I (solid black).
2. Load the solid black printed paper with its printing side facing up in a cassette of the machine.
3. Output Test Print Z to feed paper in the cassette.
4. When the leading edge of the paper comes out to the Delivery Outlet, open the Front Cover unit to cause a jam.
5. About 10 seconds afterwards, remove the jammed paper.
6. Measure the widths of the glossy part of the toner shown in the figure below on the printed paper, and check the following.

1. Check if the fixing nip width satisfies the reference values shown below. Fixing nip width (reference value): Center (a) = 6.7 +/- 1.0 mm, Edges (b and c) = 6.2 +/- 1.0 mm
2. Check if the values "a - b", "b - c", and "a - c" are 1.5 mm (reference value) or less.

If either of the above conditions are not satisfied, fixing failure may occur.