Canon imageRUNNER ADVANCE C3330 Series Troubleshooting Manual page 19

5) Go to Service mode (Level 2) > Mode List > COPIER > Adjust > HV-TR > and change the setting value of "TR-VL1" to "5".
The range of setting is from "-128" to "+127" ("0" by default).
Change the setting value by "1" changes the secondary transfer voltage 30V.
[Caution] Poor transfer may occur due to too high secondary transfer voltage if the setting value is changed.
6) Output the image having shown the symptom, and check that the symptom does not occur.
If the symptom does not improve sufficiently, reduce the setting value in the step 5) by "5" at a time up to "30" until the symptom
improves enough.
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