Settings; Photosensor Calibration - Olivetti PR2 E Service Manual

4.4 SETTINGS
4.4.1 PHOTOSENSOR CAI-IBRATION
All machine photosensors are calibrated at the factory. However, a change in the electrical characteristics
of the photosensors used or the use of non-standard paper may call for the photosensors to be
recalibrated at the customer's site.
All the photosensors present in the machine require calibration; the following are installed:
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Paper detection photosensor assembly
This assembly consists of two LEDs and two photoreceivers that are the first to detect when a
document is inserted in the front insertion slot. The ray of light is transmitted by fibre optics.
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Paper font alignment photosensor assembly
These photosensors are included in the same mechanical assembly as the paper detection
photosensors, indicated in this manual as Front photosensor assembly.
The paper front alignment photosensors check the alignment of the document before it reaches the
printhead. The assembly consists of four LEDs and four photoreceivers, all connected via fibre
optics.
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Autoborder photosensor
Fitted on the printhead, it detects the paper so as to measure the position of the first print column.
If selected from Set-up, with this sensor it is also possible to control printing interruption in cases
when the paper is narrower than the line being printed and sent from the system.
The location of the individual photosensors in the machine is shown in the figure on the following page.