Canon imageRUNNER ADVANCE 9070 PRO series, Service Manual Digest, Page: 296 / 874

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■ DPOT
COPIER> DISPLAY> DPOT
DPOT-K Display of Bk Drum surface potential
Lv.1 Details To display the current surface potential Vd on the Bk Photosensitive
Drum that is specified as a result of the potential control.
The value after the calculation of potential offset is displayed.
If the offset value is not adjusted, negative value may be detected
during printing.
Use case When the density failure or foggy image occurs, check whether the
surface potential of the Drum is the factor.
Caution • To update the display, be sure to move to a different screen, and
then move back to display it again. (The potential at the moment
of showing this screen is displayed.)
• If the value is out of range (-30 to 30), there is a possibility of
Potential Sensor disconnection.
Display/adj/set range -1100 to 0
Unit V
VCONT-K Dis of Bk contrast potential setting VL
Lv.2 Details To display the current setting value of Bk contrast potential Vcont.
Use case When checking contrast potential
Display/adj/set range 0 to 800
Unit V
Appropriate target value 150 to 400
VBACK-K Dis of Bk fogging removal potntl set VL
Lv.2 Details To display the current setting value of Bk fogging removal potential
Vback (difference between the developing DC bias and the charging
potential).
The fogging correction value is set based on this value and the value
set in user mode (Adjustment/Maintenance> Adjust Image Quality>
Correct Color Cast).
Use case When checking the setting value of fogging removal potential at
image failure such as fogging
Caution Fogging occurred in the normal use range of 150 to 250V is judged
as an error on the high voltage or the Potential Sensor.
Display/adj/set range 0 to 300
Unit V
Default value 200
Related user mode Adjustment/Maintenance> Adjust Image Quality> Correct Color Cast
2TR-PPR Dis of sec trns ATVC ppr allotted voltg
Lv.2 Details To display the paper allotted voltage set by the latest secondary
transfer Full ATVC control.
The appropriate range may be exceeded due to wrong media setting.
Use case When transfer failure occurs on certain media
Display/adj/set range 0 to 5000
Unit V
Appropriate target value Depending on media
COPIER> DISPLAY> DPOT
2TR-BASE Dis of sec transfer ATVC base voltage
Lv.2 Details To display the base voltage set by the latest secondary transfer Full
ATVC control.
The appropriate range may be exceeded due to wrong media setting.
Use case When transfer failure occurs on certain media
Display/adj/set range 0 to 6000
Unit V
Appropriate target value 500 to 5000
1TR-DC-Y Dis of primary transfer voltage (Y)
Lv.2 Details To display the voltage lastly applied to the Primary Transfer Roller (Y).
Use case When transfer failure occurs due to the primary transfer
Display/adj/set range 0 to 5000
Unit V
Appropriate target value 500 to 3000
1TR-DC-M Dis of primary transfer voltage (M)
Lv.2 Details To display the voltage lastly applied to the Primary Transfer Roller (M).
Use case When transfer failure occurs due to the primary transfer
Display/adj/set range 0 to 5000
Unit V
Appropriate target value 500 to 3000
1TR-DC-C Dis of primary transfer voltage (C)
Lv.2 Details To display the voltage lastly applied to the Primary Transfer Roller (C).
Use case When transfer failure occurs due to the primary transfer
Display/adj/set range 0 to 5000
Unit V
Appropriate target value 500 to 3000
1TR-DC-K Dis of primary transfer voltage (Bk)
Lv.2 Details To display the voltage lastly applied to the Primary Transfer Roller
(Bk).
Use case When transfer failure occurs due to the primary transfer
Display/adj/set range 0 to 5000
Unit V
Appropriate target value 300 to 4000
CHG-AC-Y Display of primary charge AC current (Y)
Lv.2 Details To display the primary charging AC current lastly flown with the AC
voltage applied to the Charging Roller (Y).
Display/adj/set range 0 to 5000
Unit uA
CHG-AC-M Display of primary charge AC current (M)
Lv.2 Details To display the primary charging AC current lastly flown with the AC
voltage applied on the Charging Roller (M).
Display/adj/set range 0 to 5000
Unit uA