Auto Drum Potential Adjustment (Drum Peculiarity Adjustment) - Konica Minolta bizhub PRO 920 Service Manual

10. TECH. REP. MODE

10.4.10 Auto drum potential adjustment (drum peculiarity adjustment)

Measure the charging potential of drum, and adjust automatically the developing bias value, charging voltage
and grid voltage.
A. Procedure
1.
Enter the Tech. Rep. mode.
2.
"Tech. Rep. mode menu screen"
Press the [Process] key.
3.
A sub menu appears on the right side of the screen.
Press the [Drum Peculiarity Adjustment] key on the sub menu.
4. "Drum peculiarity adjustment mode menu screen"
Press the [Auto Drum Potential Adjustment] key.
5.
"Auto drum potential adjustment screen"
Press the [Start] key. After the automatic adjustment, the message of completion appears.
Note
• When the following error messages appear, check to see if the drum potential sensor (DPS) is
properly installed and cleaned. Conduct the adjustment again.
1) Error 1
In the 0V check of the DPS, voltage over 100V is detected 5 times or more.
2) Error 2
The drum potential after laser exposure is detected to be over 350V, and it is determined that
control patch detect signal is not outputted.
3) Error 3
Drum potential has been corrected 10 or more times, but it does not converge.
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Field Service Ver2.0 Aug.2005