Uneven Density On The Second Face Of A Halftone Image Due To Uneven Distribution Of Moisture On Paper Surface - Canon imagePRESS C10000VPSeries Troubleshooting Manual

Uneven density on the second face of a halftone image due to
uneven distribution of moisture on paper surface
[Symptom]
When outputting a halftone image in duplex mode, uneven density [a] might appear on the second face of paper.
The arrow [b] indicates the feed direction.
[Cause]
When outputting in duplex mode, the paper may wait at the duplex path assembly prior to the printing on the second face of the
paper.
If the paper waits in the duplex feeding path assembly, the moisture would partially evaporate from the surface of paper and the
distribution of moisture on the paper surface becomes uneven.
When distribution of moisture is uneven, the transfer performance of the paper surface would change, and this results in the
aforementioned symptom.
This symptom is more likely to occur with a halftone image that is subject to the transfer performance that is changed due to the
change of the distribution of moisture on paper.
[Service work]
1) Have the customer log in from System Management Mode in user mode.
2) Go to Select Settings/Registration > Paper Settings > Paper Type Management Settings, select an appropriate paper type
from among the list, press "Duplicate" button and then "OK" button.
3) Enter any name as the duplicated paper type and press "OK" button.
4) Select the paper type duplicated in the step 3) and press "Details/Edit".
5) Select "Adj. Secondary Transfer Volt." and press "Change".
[Note] In case Adj. Secondary Transfer Volt. will not be displayed on the control panel, change the setting value of Service Mode
> Mode List > COPIER > Option > DSPLY-SW > IMGC-ADJ to "1" and perform a power-cycle of main power (off/on). The value
is "0" by default.
6) Select "back side" in Adjust Secondary Transfer Voltage to change the correction value [a] in increments of "-5" by clicking [-]
button until the symptom does not occur.
When the symptom is over-improved, adjust the correction value by clicking [+] button.
The range of setting is from "-20" to "+20" ("0" by default). Changing this value changes the secondary transfer voltage.
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