Epson Stylus PRO 7500 Service Manual page 230

EPSON Stylus Pro 7500
5.2.6.10 PF Encoder Sensor Installation Position Adjustment 2
This adjustment shifts and adjusts the PF encoder sensor on each installation frame so that
the loop scale on the PF roller shaft is positioned virtually in the center between the PF
encoder sensor's receptor and emitter. Through this adjustment, it becomes possible to read
the slits on the loop scale more accurately.
1. Loosen the 2 PF encoder assembly installation frame installation screws, then set the
tool #F765 in the PF encoder sensor's emitter side (outside) position.
PF Encoder Assembly
Installation
Figure 5-56. PF Encoder Sensor Installation Position Adjustment 2
2. Turn the PF roller one time by hand (use the reduction belt), then check if loop scale is
touching the front end of the tool, #F765. If it is found to be touching, shift the PF
encoder sensor installation frame gradually toward the printer's outside to a position
where the loop scale does not touch it in even a full rotation, then tighten the 2 PF
encoder sensor installation frame installation screws.
Adjustment
Exclusive tool #F765
Adjustment Steps
Adjust so that the scale does not
make contact with the tool.
Figure 5-57. Check Points
Due to sensor characteristics, the reading accuracy of the sensor has a
tendency to drop if the scale makes contact with the sensor's emitter
side (outside).
Revision A
PF ENC Scale
Exclusive tool #F765
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