Canon imageRUNNER Advance C3525i III

Symptom

Inaccurate right angle may occur at the paper trailing edge [a]/[b]. [c] indicates the feed direction.

Cause

If there is a difference in height at the front and at the rear of the Fixing Unit, paper proceeds unevenly when it passes through the fixing nip and the symptom occurs. If the front side is lower, paper on the front side proceeds less smoothly than the rear side, and the image on the front side shrinks [a].
If the front side is higher, paper on the front side proceeds more smoothly than the rear side, and the image on the front side enlarges [b]. Execute fixing alignment adjustment so that the height at the front and the height at the rear of the Fixing Unit become the same.

Servicing works

1. Open and lift up the Right Door [1], slide the Right Door Guide (Left) [2] and Right Door Guide (Right) [3] in the direction shown in the figure below to fully open it.
2. Grasp the light-blue handle [1], and remove the Fixing Unit
3. Open and slightly lift up the Front Door [1], and remove it while pushing the claw [2].
   • 1 Claw [2]
   • 2 Bosses [3]
4. Remove the Drum Unit (Bk).
   CAUTION:
   • If you perform work while in sleep mode or when the power was turned OFF while in sleep mode, the Primary Transfer Roller will not be disengaged, therefore the machine needs to be returned to standby state before removing the Drum Unit (Bk).
   • Since there is a risk of damaging the Photosensitive Drum, do not touch the surface.
   • Be sure to block light to the removed Drum Unit using paper, otherwise it will be exposed to light.
5. Remove the Control Panel Lower Cover [1].
   • 2 Screws [2]
   • 2 Claws [3]
6. Remove the Delivery Outlet Side Cover [1].
   • 1 Screw [2]
7. Pull out the Cassette 1 [1], and open the Cassette Side Cover [2]. • 2 Screws [3]
8. Disconnect the connector [1] of the Front Fan.
9. Open the Front Fan [1], and disconnect the connector [2].
   • 2 Screws [3]
   • 1 Claw [4]
10. Remove the Front Fan [1].
11. Remove the screws [3] of the Adjustment Plate A [1] and the Adjustment Plate B [2], and change the installation holes [4] to execute fixing alignment adjustment.
    • If the image on the front side has shrunk [a], move the Adjustment Plate A and the Adjustment Plate B upward for the same divisions of the scale.
    • If the image on the front side has enlarged [b], move the Adjustment Plate A and the Adjustment Plate B downward for the same divisions of the scale.
12. Install the parts in the reverse order from step 10 to step 1.
13. Output the image where the symptom occurred, and check that the symptom does not occur. If the symptom persists, check for other factors.