Mottled Image (2Nd-Side) - Canon imagePRESS 1135 Series Service Manual

Mottled image (2nd-side)

[Location]
Transfer
[Cause]
Lack of transfer current
[Conditions]
Low temperature / low humidity
This symptom appears obviously on the solid image / halftone image on left paper and in
addition, it gets worse on 2nd side in 2-sided print.
[Field measure]
Increase the secondary transfer current in service mode.
1) Check the absolute moisture ratio.
COPIER > DISPLAY > ANALOG > ABS-HUM2
2) Decrease the secondary transfer current.
According to the absolute moisture ratio checked in step 1), specify the setting value
from COPIER > ADJUST > HV-TR > 2TR-TGT 1 to 8.
Absolute moisture ratio
0.63 g/m 3 or less : 2TR-TGT1
0.64 to 1.72 g/m 3 : 2TR-TGT2
3
1.73 to 5.79 g/m : 2TR-TGT3
3
5.8 to 8.89 g/m : 2TR-TGT4
3
8.9 to 14.9 g/m : 2TR-TGT5
15 to 17.9 g/m 3 : 2TR-TGT6
18 to 21.5 g/m 3 : 2TR-TGT7
3
21.6 g/m or more : 2TR-TGT8
As the value is changed by 1, current is increased / decreased by 5μA.
+ : Increase
- : Decrease
Increase the value 1 by 1 and check the symptom each time.
[Points to note]
Density loss due to excessive transfer
6
Troubleshooting > Image Faults > Mottled image (2nd-side)
6 Troubleshooting > Image Faults > Mottled image (2nd-side)
[Sample Image]
6-11
F-6-9
6-11