Epson DFX-9000 Service Manual page 74

Epson DFX-9000
Top of form sensor
The reflective Top of Form sensor (TOFS) attached to the Card guide
detects the presence of paper by receiving light reflected from paper.
The sensor also detects line feed position, i.e. the amount of line feed
after paper detection.
Top of paper eject sensor
The reflective Top of Paper Eject sensor (TPES) inside the Paper eject
unit detects the presence of paper in the same way as the TOFS. The
sensor also detects the top and bottom edges of paper when it is loaded.
Paper jam detection
Paper travel is detected by the magnet roller and the Hall IC (PJS)
located on the 1st Nip Roller. When the Hall IC detects an abnormal
rotation of the magnet roller, line feed and then printing stop, and the
control panel LCD displays the message:
Error:
Paper jam
Remove the jammed paper and press [PAUSE] to clear the error.
Operating Principles
Card Guide
Carrier Unit
Card Guide
Reflective TOFS Sensor
1st Nip roller
Carrier Unit
Front Tractor
Continuous forms
fed on the Front
Paper Path
Printer mechanism
Reflective TOFS Sensor
Reflective TPES Sensor
Rear Tractor
Figure 2-10. Paper detection 2
Revision B
Reflective TPES Sensor
Hall IC (PJS)
Paper Eject Unit
Platen
DV Roller F
Continuous forms fed on
the Rear Paper Path
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