Intermec EasyCoder PC4—Service Manual 43
Chapter 5—Base Frame
5.8 Label Gap/Black Mark Sensors
Description
e receiver part of the label gap sensor and the black mark sensor are
fitted on the same circuit board. e purpose of the label gap/black mark
sensors is to control the printer’s stepper motor to feed the media properly
in relation to the gaps between labels, detection slots, or black marks at the
back of the media. It also detects out-of-media conditions. e label gap/
black mark sensor PCB is fitted below a window in the floor of the media
cavity using two screws. It is connected to JP13 on the main board.
To allow the use of parallel labels fitted on the same liner, the sensors are
placed slightly to the right of the center-line (as seen from the front) as fol
-
lows:
- Label Gap Sensor 4.5 mm 0.177 inches
- Black Mark Sensor 10 mm 0.394 inches
e board has one LED emitter and two receivers. e black mark sensor
emitter shines upwards. e black mark sensor receiver detects light
reflected by the back side of the media. No light received is interpreted as a
black mark.
e label gap sensor receiver detects light from the emitter board in the
print frame (see Chapter 4.7) that passes through gaps in the media or
through the liner between labels. No light received is interpreted as a label
(or similar) and light received is interpreted as a gap. is function can be
reversed using the
OS command, see ESim v6.xx, Programmer’s Reference
Manual
.
e sensitivity of the label gap sensor is adjusted automatically when enter
-
ing the Test Mode (see Chapter 10.2). At the same time, the label length is
determined.
Replacement
• Remove the main board from the base frame moulding.
• Disconnect the cable from JP13 on the main board.
• Adjust med media guides for maximum media width.
• Remove the screws that hold the sensor board.
• Install new board in reverse order.
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