Star Micronics TUP400 Series, Technical Manual

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5. Sensor Adjustment
You must adjust the paper sensor for the paper quality and the black mark print.
Fig. 1-6 Sensor Adjustment
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.
VR4
EPROM
Main Logic Board
VR3
Interface Board