
Operating Principles
DFX-5000+
Service Manual
2.3.3 Sensor Circuits
Figure 2-21 shows the sensor circuits in block diagram form. The printer is equipped with the
following sensors:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11
12.
13.
14.
Front and rear
PE
sensors (use a photo interrupter)
Top PE sensor (to detect the TOF position, uses a photo interrupter)
Paper jam sensor (uses a magnetic transistor)
Tractor select sensor (uses a micro mechanical switch)
Pull tractor sensor (uses a micro mechanical switch)
Cover open sensor (uses a micro mechanical switch)
CR encoder sensor (uses an LED and photo diode)
PG
sensor (uses a photo interrupter)
PG
home sensor (uses a micro mechanical switch)
+35 VDC voltage drop sensor (signal interface)
Head temperature sensor (uses a thermistor)
Fan temperature sensor (uses a thermistor)
PW sensor (uses a photo reflector)
Carriage motor isolation resistance sensor (monitored by the analog port of the CPU)
CPU
TMP96C141
(lCl)
71
47
(
1
n
-3
n
)
3
72
48.
68
50,
LJ
67
32,
65
51
T
84 18
76
26,
>>>
Zzz
Iv- 0
75
3<
74
19/
73
Figure 2-21.
Sensor Circuit
Block Diagram
2-22
Rev.
A
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