Fujitsu DL7400 Maintenance Manual page 122

5.2.1.3 LRES (Carriage position) detection
The left and right carriage positions are detected using one LRES sensor provided on the back of the carriage and
the left and right shield plates provided on the upper stay. The shield plates are different in length in the
direction in which the carriage moves.
The LRES uses a photo interloper (packaged device include LED and photo transistor) and detects the presence of
the shield plate, i.e., the interrupted
LRES sensor
(When LES detect)
Left shield plate
state and the transparent state.
LRES sensor
(When RES detect)
Figure 5.4 LRES detection
122
Right shield plate