Image Faults; Optimization Of Fixing Pressure And Fixing Temperature When Envelops Are Fed - Canon imagePRESS C850 Series Troubleshooting Manual

Image Faults

Optimization of fixing pressure and fixing temperature when
envelops are fed
[Symptom]
When envelops pass the fixing assembly, the load is centralized on the overlapping points [a] on the reverse side of envelop.
Therefore an image having partial white spots may be output due to the occurrence of worn-out fixing belt surface or shaved
rubber of fixing roller surface. If the fixing pressure is greater, the overlapping points [a] may make impresses [b] on the front of
envelop depending of the type of envelop.
[Service work]
As the measure of the above-mentioned symptoms, MN-CONT is graded up to v30.52 and D-CON is graded up to v30.31 for the
following 2 controls.
A) Optimization and segmentation of fixing pressure and fixing temperature for envelops.
B) Increase of changing range for fixing pressure adjusted values of envelops.
A) Optimization and segmentation of fixing pressure and fixing temperature for envelops.
The default value for fixing pressure is decreased and the default value for fixing temperature is increased. The paper weight is
classified into 6 ranges and each range has its specified default values for fixing pressure and fixing temperature.
This Optimization and segmentation reduce the abrasions of fixing belt surface or fixing roller surface and then the image having
partial white spots will rarely occur.
[Reference] The following table shows the previous fixing pressure and fixing temperature when passing envelopes.
Width of envelop/Paper weight
Less than 220mm
More than 221mm
• The unit of paper weight is g/m2.
• [pls] in the table means the unit of fixing pressure. The numeric value means the number of pulse which drives the pressure
motor from its home position. The bigger the numeric value is, the greater the pressure is.
The following table is for optimized and segmentalized new fixing pressure and fixing temperature.
Classification
Width of envelop/ 106 to 128
Paper weight
Less than 130mm 870 pls
180℃
131 to 180mm 870 pls
180℃
181 to 220mm 1170 pls
1 2
129 to 150
600 pls
190℃
600 pls
190℃
870 pls
870 pls
180℃
1170 pls
180℃
3 4 (Default)
151 to 180 181 to 220
400 pls 400 pls
190℃ 190℃
600 pls 600 pls
190℃ 190℃
600 pls 600pls
2
181 to 220
5
221 to 256 257 to 300
200 pls 200 pls
195℃ 195℃
400 pls 200 pls
195℃ 195℃
400 pls 200 pls
6