●
The State virtual LED next to the sensor number and sensor name illuminates green when the
sensor is active.
●
The Toggle virtual LED next to the sensor number and sensor name illuminates green after the
sensor is activated and increments by one each time the sensor is interrupted (activated or
deactivated).
For example, opening the cartridge door increments the SW4 Front door opening/closing Toggle
item count two times—once when the door is opened, and once when the door is closed.
NOTE: The following table describes the sensor tests available with an optional 1x550-sheet paper feeder
installed.
For trays other than Tray 1 or Tray 2, the tray number associated with a sensor or switch depends on the
number and type of accessories installed.
For a diagram of sensor locations, see Figure 2-53 Printer base, sensors and switches block diagram
on page 161.
Table 2-12 Manual sensor diagnostic tests
Sensor or switch Replacement Part number Description
SW4 Front door opening/closing sensor RM2_7133-000CN Switch PCA assembly
SW3 Right door opening/closing sensor WC2-5806-000CN Switch button assembly
SR21 Tray 3 feed sensor
1
RM2-5145-000CN Paper feed assembly
SR6 Registration sensor RM2-0093-000CN (M553n)
RM2-0018-000CN (M552dn, M553dn, M553x,
M577)
Registration assembly
PS1 Fuser loop 1 sensor B5L35-67902 (110 V)
B5L36-67902 (220 V)
Fuser
SR13 Front Media width sensor
SR13N Front Media width sensor
RM2-0017-000CN Paper pickup assembly
SR14 Rear media width sensor
SR14N Rear media width sensor
RM2-0017-000CN Paper pickup assembly
SR11 Fuser pressure release sensor B5L35-67902 (110 V)
B5L36-67902 (220 V)
Fuser
SR9 Fuser output sensor B5L35-67902 (110 V)
B5L36-67902 (220 V)
Fuser
SR10 Output bin full sensor RM2-0092-000CN (M553n)
RM2-0016-000CN (M552dn, M553dn, M553x,
M577)
Paper delivery assembly
1
Only appears if optional accessories are installed.
152 Chapter 2 Solve problems ENWW
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