Star Micronics TUP900 Series Technical Manual page 5

3. Since it is adjusted by rotating the volume VR1, check the position of the volume. Prepare a small slotted
screwdriver.
4. Set the paper not for black mark.
5. Use the tip of a thin object to turn off the DIP switch DSW 1-4.
6. Turn the power on.
7. Rotate the volume VR1 using micro screwdriver, to adjust it to a position whereat both the LED1 (green LED) and
the LED2 (red LED) lamps light.
8. Turn the power OFF.
9. Turn the DIP switch DSW 1-4 to its original setting of ON.
This completes the paper end & black mark sensor adjustment.
2. Adjustment of the Paper Near End Sensor
1. Turn the printer off and unplug the power cord.
2. Remove the screws. Then, remove the board chassis.
Screw
Board chassis
DIP Switch DSW1
Fig. 1-3 Adjustment Volume
VR6
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