Roland VersaCAMM VP-540 Service Notes page 166

Turn on the Sub Power SW while pressing [
4
[ ] keys to enter the Service Mode.
Set up the PET-G on the machine.
[BIAS ADJUSTMENT]
5
Select [PRINT MENU]> [HEAD ADJUST]> [BIAS], and
press [ENTER] key.
Test pattern as shown in the figure will be printed.
6
<VP-300>
DAMPER
PLATE
], [ ] and
4-25
+
MENU
MENU
SERVICE MENU
SERVICE MENU
PRINT MENU
[ ] [ ]
PRINT MENU
HEAD ADJUST
[ ] [ ]
HEAD ADJUST
BIAS
[ ]
BIAS
TEST PRINT
[ ]