Paper Sensor - Intermec EasyCoder PX4i Service Manual

5.2 Paper Sensor

Description
Adjustment
Replacement
EasyCoder PX4i and PX6i Service Manual
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The paper sensor allows the fi rmware to detect when the diameter of the
remaining media becomes less than a value set in the Setup Mode.
In Fingerprint, this affects SYSVAR(46) which switches from 0 to 1.
Thus, a Fingerprint program can be created, that reads SYSVAR(46) and
uses it to issue for example audible alarms or error messages to notify the
operator of a pending out-of-media condition. A trap is also sent that can
be detected when the printer is connected to a network via an EasyLAN
interface.
In IPL, a trap is sent that can be detected when the printer is connected to
a network via an EasyLAN interface.
The sensor detects the saw-tooth shape of the code disc at the inner end of
the media supply hub. By comparing the rotation speed of the hub and the
print speed, the fi rmware can calculate the diameter of media roll.
The paper sensor assy is fi tted to the center section using a #10 Torx screw
and is connected to J57 on the CPU board (see Chapter 15.3).
Refer to the chapter "Setting Up the Printer" in the User's Guide for the
printer in question.
• Switch off the power, disconnect the power cord, and remove the left-
hand cover.
• Disconnect the cable from J57 on the CPU board.
• Remove the crescent-shaped guide plate, which is held by three #T20
Torx screws.
• Remove the entire media supply unit which is held by four #T20 Torx
screws.
• Remove the single #T10 Torx screw that holds the sensor to the center
section.
• Carefully pull out the sensor and its cable through the hole in the center
section.
• Install a new sensor assembly in reverse order.
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Chapter 5 — Media Supply
39