Digi HI-700HS, Service Manual, Page: 180 / 324

HI - 700HS service manual - 4 – servicing
4 - 71 Issue 2 06/2020
Signature labeller - label gap sensor sensitivity adjustment -
continued
3. Adjust trimmer pot (TR3) on I/F sensor board
A label sensor interface board is mounted to the main labeller board.
For a standard Signature labeller the sensor sensitivity can be adjusted using pot TR3
Setting the sensitivity value
Adjust the pot (TR3) so that the gap sensor value (reading on screen) is near to its highest value when
there is a label in the sensor.
For labels with differing colours check whole label to determine where the highest value is
The max value for sensor is 4095, adjust so that the value is still changing (approx. 3800).
With the sensor set as above, when the sensor sees just the backing paper (or nothing) the change in value
is the biggest difference when compared to the label value
Approximate value for white label with jumper (J5) set to B
Trim pot TR3 set to give gap sensitivity value (with label) at 3600
Sensing backing paper value will be approx. 360
Nothing in sensor approx. value will be 200
Therefore 3600 - 360 = 3240 —— - this give a large value difference and with the gap threshold set at default
800 (change in value) the sensor will detect the label / backing paper correctly