Olivetti PR2 PLUS Service Manual page 73

To carry out the photosensor calibration procedure, proceed as follows:
1. Open the printer cover. Check that the printhead is positioned on the left (end of carriage).
2. Power on the printer, with the cover open, keeping the three
console keys pressed.
3. Wait for the acoustic signal that indicates access to the calibration and adjustment procedure.
4. Close the printer cover.
4 LEDs are illuminated while the READY LED flashes.
5. Press the STATION1 key twice and wait until the LED "insert
paper" (STATION 2) illuminates. The printer logic will read the
current and voltages present on the photosensors when
paper is absent.
6. Into the front slot, insert a sheet in Mylar (code 473245H01)
and press the STATION2 key. The sheet is inserted
completely in a way that it covers all the photosensors. At the
same time, the printer logic will perform a reading of the
currents and voltages present on the photosensors for the
paper present status.
7. Press the STATION2 button. Wait for the end of the movement that introduces and ejects the sheet.
8. If, after ejection of the sheet, there are no faults, the console LEDs will remain off; subsequent re-insertion of a
sheet of A4 paper will permit printing of the values read and selected for each individual photosensor.
9. Verify that the values printed for every photosensor are included within the limits indicated in the following figure.
If the values respect the limits, the sensors are functioning correctly. On the other hand if any value is
anomalous (outside or very near to the limit), it means that the photosensor is either dirty or very near breakage
point.
– 1 - Minimum value acceptable greater than or equal to 3500.
– 2 - Maximum value acceptable less than or equal to 1500.
– 3 - The difference between the acceptable values for B and the acceptable values for A must be
at least 3000.
≥
1: minimum value 3500
≤
2: maximum value
≥
3: B-A 3000
Figure 4 - 3 Voltages and currents measured on photosensors
10. If the calibration operations complete with a positive outcome, the printer returns automatically to its initial state,
allowing another calibration or adjustment procedure to be selected.
XZAC4219-05
Photosensors
Photosens. 1 front paper present
Photosens. 2 front paper present
Photosens. 1 front paper align.
Photosens. 2 front paper align.
1500
Photosens. 3 front paper align.
Photosens. 4 front paper align.
Rear paper present photosens.
Paper edge printhead photo.
2
Paper No
(mV.)
4xxx
4xxx
4xxx
2xxx
4xxx
4xxx
1xxx
1xxx
Service Manual
Average
Paper Yes
Current
val.
(mV.)
(mA.)
(mV.)
0xxx 1xxx 8,2
0xxx 1xxx 12,3
0xxx 1xxx 11
1xxx 0xxx 23
0xxx 1xxx 4,6
0xxx 1xxx 5
2xxx 25
4xxx
2xxx 18
4xxx
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