Maintenance Sensor (Purge Unit - Brother MP-21C Service Manual

3.5.3

Maintenance Sensor (Purge Unit)

The Maintenance sensor uses a photo sensor to detect the home position of the
Maintenance cam.
The sensor is on during stand-by ( home position ) and goes off when the Maintenance
cam rotates and detects the Maintenance cam's position to start the suction operation.
The sensor goes on after the purge, ejection, wiping and capping operations are
completed.
Flushing foam R2
Maintenance cam
Head cap
Flushing foam R1
Cylinder ASSY
Maintenance gear 10
Purge unit FFC
Maintenance sensor
Fig. 2.19
II-19