Label Taken Sensor (Lts) - Intermec EasyCoder PD41 Service Manual

Label Taken Sensor (LTS)

EasyCoder PD41/PD42 Printer Service Manual
This section describes the Label Taken Sensor, which is a standard feature
on the EasyCoder PD41/PD42 printer.
The purpose of the Label Taken Sensor is to detect if a label has been
removed after printing and—if not—hold the printing of the next label. It
works equally well when the media is manually torn off after printing as
when the labels are automatically separated from the liner. The latter
requires an optional rewinder module (see
page 57).
The LTS is normally folded up into the side of the front panel but can be
folded down to a horizontal position after the right hand door has been
opened. In the horizontal position, it detects labels approximately 15 mm
(0.59 in) from the inner edge of the media path and approximately 22 mm
(0.86 in) in front of the printhead's dot line.
Label Taken
Sensor
Note: If you are running a software application, the LTS must be activated
before it can be used. When you are not using the LTS, be sure to flip it
back in vertical position and de-activate it in the application. Also note that
the LTS cannot be used when a paper cutter is installed.
The LTS has a plastic housing, which is hinged on a pin protruding from
the inside of the panel module. The housing contains a circuit board with a
LED and a light-sensitive sensor. The sensors are connected to P38
(marked "LTS") on the main board. When the light from the LED is
reflected back from the back side of a label and hits the sensor, a "label
present" condition is assumed. If no light is detected, a "label taken"
condition is assumed. Thus, the sensor is somewhat sensitive to the
ambient light conditions and to the reflection properties of the back side of
the media.
Chapter 3 — Replacing Parts
"Rewinder Module" on
59