Sensor Adjustment - Star Micronics TUP400 Series Technical Manual

5.

Sensor Adjustment

You must adjust the paper sensor for the paper quality and the black mark print.
1) Remove the screw on the underside of the paper-roll holder and remove the ROM cover.
2) Turn ON the power supply while holding down the push switch on the Near-end Sensor Board.
Remove the push-switch within 3 seconds after the "HU" LED on the Near-end Sensor Board lights.
CAUTION
If you continue holding the push switch for more than 3 seconds, the "PE" LED will light and you will not
be able to make any adjustments.
3) Black Mark Sensor
• Insert a piece of paper into the mechanism's sensor area. Set it anywhere but the book mark area.
• Rotate the variable resistor VR4 on the main logic board until the "HU" LED on the Near-end Board lights.
Paper End Sensor
• Insert a piece of paper into the mechanism's sensor area. Set it anywhere but the book mark area.
• Rotate the variable resistor VR3 on the main logic board until the "PE" LED on the Near-end Board lights.
4) After the LED lights, press the RESUME switch.
VR3
VR4
EPROM
Main Logic Board
Interface Board
Fig. 1-6 Sensor Adjustment
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