Canon NP6012 Service Manual page 221

Wg INSTALLATION
5. Main Unit Adjustment Operations
applies only to models without automatic indication for drum unit replacement.
Main unit adjustment
operations are performed
from the Adjustment
Operations mode. To
enter this mode, hold
down the A key for
approximately four
seconds or longer.
After approximately four
seconds have elapsed,
"U1" appears in the Copy
quantity/Copy ratio
display.
Enter the Installation
Adjustment Operations
mode ("U7"). Press down
the [+] key until "U7"
appears in the Copy
quantity/Copy ratio
display.
+ If you make a mistake,
press the (4] or [-] key
until the desired value
appears in the display.
Press the Start (<)>) key.
"71" will appear in the
Copy quantity/Copy ratio
display and you will enter
the Voltage Adjustment
mode.