Star SP742 Series Hardware Manual page 34

5-4-4. Black Mark Sensor Alignment Mode
1. Turn the printer off and unplug the power cord.
2. Place the printer upright as shown below to remove the screws and remove the dip switch cover from the bottom
of the printer. Be sure to place the printer upright because you will not be able to properly adjust the printer if it
is placed on its side.
Power OFF
3. Since it is adjusted by rotating the volume VR2, check the position of the volume. Prepare a small slotted
screwdriver that will fit in the hole.
4. Set the roll paper not for black mark.
5. Enter the black mark sensor adjustment mode according to the procedure described "5-4.
6. Rotate the volume VR2 using micro screwdriver, to adjust it to a position whereat both the ERROR (red LED)
and the POWER (green LED) lamps light.
7. Turn the power OFF.
This completes the black mark sensor adjustment.
– 30 –
Adjustment Mode".