Canon iR6570 series Service Manual page 213

Chapter 7
COPIER>ADJUST>HV-TR>D-PRE-TR (entering offset value for pre-transfer high-voltage output of DC controller PCB)
Enter the value indicated on the label attached to the new DC controller PCB if you have replaced the DC controller PCB or initialized the RAM on the
DC controller PCB.
COPIER>OPTION>BODY>W-CLN-P
Use it to set the interval of automatic cleaning of the pre-transfer charging wire in terms of the number of prints.
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