EPSON Stylus Pro 9500 Revision A
Operating Principles Component List & Illustrations 63
2.1.1.5 Cover open sensor
To ensure proper paper feeding and to prevent paper jams, the front cover
must be closed during printing. There are two cover open sensors, one on
each side of the printer, that detect when the cover is open using an interlock
switch. When the cover is open, the relay that controls the current to the CR
motor and PF motor cuts off the flow of that current. The motors lose their
electromagnetized state when the current is cut off.
Figure 2-18. Cover Open Sensor
The sudden loss of current to the motors can cause problems and may even
damage the motors or the printhead. To prevent this, a discharge from the
capacitor connected to the current circuit is used to slow down the current
before it is totally cut off. This process ensures that printing stops when the
cover is open without causing any damage to printer parts.
Figure 2-19. Cover-Open-Motor Control Circuit
Front cover
open
C126/127
PF
Motor
CR
Motor
Driver
Driver
Front
Cover
Cover Open
Sensor
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