Canon MF6180dw
Troubleshooting. Items
Trailing edge image soiling
Cause
The image is extended when the paper feed speed is increased due to the temperature rising in the machine. This causes the trailing edge margin to become narrow, resulting in the occurrence of image soiling (transfer toner scattering).
NOTE :
Because paper slightly shrinks due to its passing through the Fixing Assembly once when printing the 1st side, this symptom is likely to occur on the 2nd side.
Field Remedy
Remedy (1): Set the Special Mode U to ON.
Effect: Image soiling is controlled by changing the settings of transfer high voltage current.
Remedy (2): Change the paper type mode from "Plain" to "Plain L".
Effect: Fixing control temperature is reduced => Temperature rising in the machine is controlled => Reduction of trailing edge margin is controlled.
When the effect is not enough with remedy (1), perform the remedies (1) + (2).
Repetitive Image Defects Ruler
| Component | Distance between defects (mm) |
|---|---|
| Registration roller | About 43 |
| Primary charging roller | About 38 |
| Photosensitive drum | About 75 |
| Developing roller | About 42 |
| Transfer roller | About 39 |
| Fixing film unit | About 57 |
| Pressure roller | About 63 |
Nip-width Specifications
The nip-width of the fixing unit is not adjustable in this printer, however the improper nip-width may cause the poor fixing.
Nip width of the Fixing Assembly can be checked by the following procedure.
- Select TESTMODE > PRINT > PG-TYPE, and set the value to "2". (Solid black is printed.)
- Select TESTMODE > PRINT > START, and press the OK key.
- Turn the printed side of the solid black printed paper down, and place it in the cassette of the machine.
- Select TESTMODE > PRINT > PG-TYPE, and set the value to "3". (Blank image is printed.)
- Select TESTMODE > PRINT > START, and press the OK key.
- Open the Front Door immediately before the paper is delivered (when the paper is fed through the Fixing Assembly), and take out the printed paper after leaving it for 10 seconds or longer.
• Center (a): 6.1mm to 8.1 mm
• Edge (b) , (c): 6.1mm to 8.1 mm
