Paper Supply Unit Selection Control; Ohp Front/Back Detection Control - Epson AcuLaser C8500 Service Manual

EPSON AcuLaser C8500

2.7.3 Paper Supply Unit Selection Control

If not controlled by the printer controller, the paper supply unit selected when
the power is turned ON is as follows:
Table 2-3. Paper Supply Unit Selection Control
Priority Selected paper supply
sequence unit
1st priority Cassette 1
2nd priority Cassette 2
3rd priority Cassette 3
4th priority MSI Tray
NOTE: The paper at the bottom of the printer is referred to as "Cassette
1." The first level of the optional FEEDER UNIT is called "Cassette
2" and the second level "Cassette 3."
Operating Principles
Selection conditions
When paper Cassette 1 is
mounted and there is paper in
the tray, or when there is no
paper in any of the paper supply
units.
When paper Cassette 2 is
mounted and there is paper in
the and 1 is not selected.
When paper Cassette 3 is
mounted and there is paper in
the and neither Cassette 1 nor
Cassette 2 is selected.
When there is paper in the MSI
and neither Cassette 1,
Cassette 2, nor Cassette 3 is
selected.

2.7.4 OHP Front/Back Detection Control

OHP white frame detection control is intended to prevent OHP film with white
frame from getting stuck on the HEAT ROLL. The Top and bottom ends of the
OHP film with white frame are detected by checking signal output of the OHP
SENSOR.
Figure 2-53. OHP Front/Back Detection Control
OHP White Frame Detection Movement
There is a notch of the transparency in a part of the white zone at the end
of the OHP paper with the white frame, and the signal level of two sensors
is more different, and it can be detected.
Revision C
2-51