EPSON Stylus Pro 9000 Revision B
Adjustment Adjustment Steps 134
SENSOR ADJUSTMENT
After replacing the C277MAIN board or one of the sensors: P_EDGE,
P_FRONT and P_REAR, you need to adjsut a corresponding volume (variable
resistor) on the main board to determine the correct detection level of sensors.
First, remove the access cover on the Paper Guide-U and enter "Test Menu" of
self-diagnostic mode and select "Sensors" check mode. And then goto the
check item for the corresponding sensor.
o P_EDGE Sensor
1. First, move the carriage left and right manually and make sure that the
signal level indicated on the LCD is smaller than 18H.
2. Place one sheet of "EPSON Photo Quality Inkjet Paper" in the paper path.
3. Lower the release lever to the lock position.
4. Move the carriage over the paper where the P_EDGE sensor is located in
the middle of paper.
5. Adjust the volume VR1 on the main board so that the signal level indicated
on the LCD is 80H ±8H
.
o P_FRONT Sensor
1. Make sure that the signal level indicated on the LCD is smaller than 18H.
2. Place one sheet of "EPSON Photo Quality Inkjet Paper" over the
P_FRONT sensor on the Paper guide-L.
3. Lower the release lever to the lock position.
4. Adjust the volume VR2 on the main board so that the signal level indicated
on the LCD is 8AH ±8H
.
o P_REAR Sensor
1. Make sure that the signal level indicated on the LCD is smaller than 18H.
2. Place one sheet of "EPSON Photo Quality Inkjet Paper" over the P_REAR
sensor on the Paper guide-U, and hold it at both sides of sensors.
3. Adjust the volume VR3 on the main board so that the signal level indicated
on the LCD is 87H ±8H
.
Figure 5-12. Adjust Volume on the C277MAIN Board
CAUTION
When you make these adjustments, make sure to
avoid strong light (sun-light) around the printer.
(These sensors are photo-sensitive sensor and may
not function properly under such conditions.)
Table 5-11. Sensor Adjustment Values
Sensor VR
Without
Paper
With
Paper
P_EDGE Sensor VR1 18H or less 80H ±8H
P_FRONT Sensor VR2 18H or less 8AH ±8H
P_REAR Sensor VR3 18H or less 87H ±8H
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