Intermec EasyCoder PD4, Service Manual

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Intermec EasyCoder PD4—Service Manual 41
Chapter 7—Print Mechanism
7.6 Headlift Sensor
Description
The headlift sensor is a microswitch fi tted inside the outer gable of the
print mechanism, immediately below the platen roller bearing. The
microswitch is activated by an arm connected to the printhead lever. If
attempting to print while the headlift sensor indicates that the printhead is
open, Error 11 “Print head lifted” occurs.
The headlift sensor is connected to CN14 (“DOOR”) on the main board.
Replacement
Before replacing the headlift sensor, check the function of the microswitch
by lifting the printhead and inserting a match or similar through a hole in
the outer gable and pressing the button on the switch.
To remove the headlift sensor, follow these steps:
1 Disconnect the power cord and remove the left-hand panel as described
in Chapter 3.2. Carefully read the safety instructions in Chapter 3.2!
Open the right-hand door and remove the bottom right-hand panel, see
Chapter 2.4.
2 Disconnect the cable from CN14 (“DOOR”) on the main board. Free
the cable from the spiral binding and the cable clips.
3 Remove the E-ring, washer, and bearing from the outer end of the platen
roller, that is, the end in the media compartment.
4
Remove six screws that hold the outer gable of the printhead.
5 Fold the outer gable aside, taking care not to damage the headlift sensor
and its cable.
6 Remove the single screw that holds the sensor to the L-shaped bracket.
7
Pull out the headlift sensor through the holes in the bracket and the
inner gable and into the electronics compartment.
8 Install the headlift sensor in reverse order.
Headlift sensor
Outer gable
Bearing
Washer
E-ring
Screw (x6)