Canon imageRUNNER ADVANCE C350 series Service Manual page 526

[Field Remedy]
1) In Service Mode(LEVEL2): COPIER > Adjust > HV-TR > 1TR_xxxx, set "-3".
The setting range is from "-50" to "50" (default value: 0).
By changing the setting value by "1", the primary transfer current is changed by 1
microampere.
Select "1TR_xxxx" according to the type and size of paper used and the color with which
the symptom occurs.
The following describes an example using Plain paper 1 (64 to 75gsm)/A4.
• When the symptom occurs with yellow: Change the setting value to "-3" in 1TR_TGM,
1TR_TGC, and 1TR_TK4.
• When the symptom occurs with magenta: Change the setting value to "-3" in 1TR_
TGC and 1TR_TK4.
• When the symptom occurs with cyan: Change the setting value to "-3" in 1TR_TK4.
Color with which the
symptom occurred
Paper type , Size
Plain paper 1 (64 to 75 gsm) Less than A4 (210mm)
Plain paper 2 (76 to 90 gsm)
Recycled paper 1
(64 to 75 gsm) A4 (210mm) or more
Recycled paper 2
(76 to 90 gsm)
Plain paper 3 ALL
(91 to 105 gsm)
Recycled paper 3
(91 to 105 gsm)
Other ALL
2) Select Service Mode: COPIER > Function > MISC-P > "1ATVC-EX" and press the "OK"
button to execute the primary transfer ATVC control.
3) Output the image that caused the symptom, and check to see that the symptom does not
occur.
6
Troubleshooting > Troubleshooting Items > Image Failure > Fogging surrounding high density images in low humidity environment
Yellow Magenta Cyan
1TR_TGM3 1TR_TGC3 1TR_TK43
1TR_TGC3 1TR_TK43
1TR_TK43
1TR_TGM 1TR_TGC 1TR_TGK4
1TR_TGC 1TR_TGK4
1TR_TGK4
1TR_TGM3 1TR_TGC3 1TR_TK43
1TR_TGC3 1TR_TK43
1TR_TK43
1TR_TGM2 1TR_TGC2 1TR_TK42
1TR_TGC2 1TR_TK42
1TR_TK42
6 Troubleshooting > Troubleshooting Items > Image Failure > Fogging surrounding high density images in low humidity environment
■ Fogging surrounding high density images in low humidity
environment
[Location]
High secondary transfer voltage
[Cause]
When paper that had been left in a low humidity environment was used, fogging [1]
surrounding high density images appeared in some cases.
The arrow [A] indicates the paper feed direction.
High secondary transfer voltage is required to transfer a high density image on paper with
high surface resistance.
When the surface resistance of paper is high, the secondary transfer voltage at the high
density area becomes insufficient, so that the toner attached on the paper becomes
impossible to be retained there and then is scattered to non-image area to generate the
symptom.
T-6-10
ITB
F-6-16
Secondary Transfer Outer Roller
Paper
F-6-17
6-15
6-15